| Line |
Label |
Object Class |
Period Type |
Balance |
Report ElementName |
| 1 |
1001 - Document - Document and Entity Information |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DocumentandEntityInformation |
| 2 |
Implied Table |
Table |
* |
* |
implied:Table |
| 3 |
Document and entity information [abstract] |
Abstract |
|
|
ck0001087711:DocumentAndEntityInformationAbstract |
| 4 |
Document Type |
Concept (Submission Type) |
For Period |
|
dei:DocumentType |
| 5 |
Amendment Flag |
Concept (Yes/No) |
For Period |
|
dei:AmendmentFlag |
| 6 |
Document Period End Date |
Concept (Date) |
For Period |
|
dei:DocumentPeriodEndDate |
| 7 |
Document Fiscal Year Focus |
Concept (Year) |
For Period |
|
dei:DocumentFiscalYearFocus |
| 8 |
Document Fiscal Period Focus |
Concept (Fiscal Period) |
For Period |
|
dei:DocumentFiscalPeriodFocus |
| 9 |
Trading Symbol |
Concept (Text/String) |
For Period |
|
dei:TradingSymbol |
| 10 |
Entity Registrant Name |
Concept (Text/String) |
For Period |
|
dei:EntityRegistrantName |
| 11 |
Entity Central Index Key |
Concept (CIK Number) |
For Period |
|
dei:EntityCentralIndexKey |
| 12 |
Current Fiscal Year End Date |
Concept (Month/Day) |
For Period |
|
dei:CurrentFiscalYearEndDate |
| 13 |
Entity Well-known Seasoned Issuer |
Concept (Yes/No) |
For Period |
|
dei:EntityWellKnownSeasonedIssuer |
| 14 |
Entity Current Reporting Status |
Concept (Yes/No) |
For Period |
|
dei:EntityCurrentReportingStatus |
| 15 |
Entity Filer Category |
Concept (Filer Category) |
For Period |
|
dei:EntityFilerCategory |
| 16 |
Entity Shell Company |
Concept (Yes/No) |
For Period |
|
dei:EntityShellCompany |
| 17 |
Entity Emerging Growth Company |
Concept (Yes/No) |
For Period |
|
dei:EntityEmergingGrowthCompany |
| 18 |
Entity Common Stock, Shares Outstanding |
Concept (Shares) |
As Of |
|
dei:EntityCommonStockSharesOutstanding |
| 19 |
1003 - Statement - Consolidated Income Statement |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesAnalysisOfIncomeAndExpense-800200 |
| 20 |
Implied Table |
Table |
* |
* |
implied:Table |
| 21 |
Profit or loss [abstract] |
Abstract |
|
|
ifrs-full:IncomeStatementAbstract |
| 22 |
Profit (loss) [abstract] |
Abstract |
|
|
ifrs-full:ProfitLossAbstract |
| 23 |
Interest and similar income |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:RevenueFromInterest |
| 24 |
Interest expense and similar charges |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:InterestExpense |
| 25 |
Net interest income |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:InterestRevenueExpense |
| 26 |
Fee and commission income |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:FeeAndCommissionIncome |
| 27 |
Fee and commission expense |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:FeeAndCommissionExpense |
| 28 |
Net fee and commission income |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:FeeAndCommissionIncomeExpense |
| 29 |
Net trading and other income |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:NetTradingAndOtherIncome |
| 30 |
Total operating income |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:RevenueAndOperatingIncome |
| 31 |
Operating expenses before credit impairment losses, provisions and charges |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:OperatingExpensesBeforeCreditImpairmentLossesProvisionsAndCharges |
| 32 |
Credit impairment losses |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:ImpairmentLossOnFinancialAssets |
| 33 |
Provisions for other liabilities and charges |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:ProvisionsForOtherLiabilitiesAndCharges |
| 34 |
Total operating credit impairment losses, provisions and charges |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:AggregateOperatingCreditImpairmentLossesProvisionsAndCharges |
| 35 |
Profit before tax |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:ProfitLossBeforeTax |
| 36 |
Tax on profit |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:IncomeTaxExpenseContinuingOperations |
| 37 |
Profit after tax |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:ProfitLoss |
| 38 |
Attributable to: |
Abstract |
|
|
ifrs-full:ProfitLossAttributableToAbstract |
| 39 |
Equity holders of the parent |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:ProfitLossAttributableToOwnersOfParent |
| 40 |
Non-controlling interests |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:ProfitLossAttributableToNoncontrollingInterests |
| 41 |
Profit after tax |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:ProfitLoss |
| 42 |
1004 - Statement - Consolidated Statement of Comprehensive Income |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/StatementOfComprehensiveIncomeOCIComponentsPresentedNetOfTax-410000 |
| 43 |
Implied Table |
Table |
* |
* |
implied:Table |
| 44 |
Statement of comprehensive income [abstract] |
Abstract |
|
|
ifrs-full:StatementOfComprehensiveIncomeAbstract |
| 45 |
Profit after tax |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:ProfitLoss |
| 46 |
Other comprehensive income: |
Abstract |
|
|
ifrs-full:OtherComprehensiveIncomeAbstract |
| 47 |
Other comprehensive income that may be reclassified to profit or loss subsequently: |
Abstract |
|
|
ifrs-full:ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract |
| 48 |
Available-for-sale securities: |
Abstract |
|
|
ifrs-full:AvailableforsaleFinancialAssetsAbstract |
| 49 |
- Change in fair value |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:GainsLossesOnRemeasuringAvailableforsaleFinancialAssetsBeforeTax |
| 50 |
- Income statement transfers |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:ReclassificationAdjustmentsOnAvailableforsaleFinancialAssetsBeforeTax |
| 51 |
- Taxation |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:IncomeTaxRelatingToAvailableforsaleFinancialAssetsOfOtherComprehensiveIncome |
| 52 |
Other comprehensive income available-for-sale securities, total |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:OtherComprehensiveIncomeNetOfTaxAvailableforsaleFinancialAssets |
| 53 |
Movement in fair value reserve (debt instruments): |
Abstract |
|
|
ifrs-full:FinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeAbstract |
| 54 |
- Change in fair value |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:GainsLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeBeforeTax |
| 55 |
- Income statement transfers |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:ReclassificationAdjustmentsOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeBeforeTax |
| 56 |
- Taxation |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:IncomeTaxRelatingToFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncome |
| 57 |
Other comprehensive income fair value reserve (debt instruments) |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:GainsLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeNetOfTax |
| 58 |
Cash flow hedges: |
Abstract |
|
|
ifrs-full:CashFlowHedgesAbstract |
| 59 |
- Effective portion of changes in fair value |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:GainsLossesOnCashFlowHedgesBeforeTax |
| 60 |
- Income statement transfers |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:ReclassificationAdjustmentsOnCashFlowHedgesBeforeTax |
| 61 |
- Taxation |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:IncomeTaxRelatingToCashFlowHedgesOfOtherComprehensiveIncome |
| 62 |
Other comprehensive income cash flow hedges, total |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:OtherComprehensiveIncomeNetOfTaxCashFlowHedges |
| 63 |
Currency translation on foreign operations |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:GainsLossesOnExchangeDifferencesOnTranslationNetOfTax |
| 64 |
Net other comprehensive income that may be reclassified to profit or loss subsequently |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax |
| 65 |
Other comprehensive income that will not be reclassified to profit or loss subsequently: |
Abstract |
|
|
ifrs-full:ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTaxAbstract |
| 66 |
Pension remeasurement: |
Abstract |
|
|
ck0001087711:PensionRemeasurementAbstract |
| 67 |
- Change in fair value |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:OtherComprehensiveIncomeBeforeTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans |
| 68 |
- Taxation |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:IncomeTaxRelatingToRemeasurementsOfDefinedBenefitPlansOfOtherComprehensiveIncome |
| 69 |
Pension remeasurement, total |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans |
| 70 |
Own credit adjustment: |
Abstract |
|
|
ck0001087711:ChangeInFairValueOfFinancialLiabilityAttributableToChangeInCreditRiskOfLiabilityAbstract |
| 71 |
- Change in fair value |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:OtherComprehensiveIncomeBeforeTaxChangeInFairValueOfFinancialLiabilityAttributableToChangeInCreditRiskOfLiability |
| 72 |
- Taxation |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:IncomeTaxRelatingToChangesInFairValueOfFinancialLiabilityAttributableToChangeInCreditRiskOfLiabilityOfOtherComprehensiveIncome |
| 73 |
Own credit adjustment, total |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:OtherComprehensiveIncomeNetOfTaxChangeInFairValueOfFinancialLiabilityAttributableToChangeInCreditRiskOfLiability |
| 74 |
Net other comprehensive income that will not be reclassified to profit or loss subsequently |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax |
| 75 |
Total other comprehensive income net of tax |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:OtherComprehensiveIncome |
| 76 |
Total comprehensive income |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:ComprehensiveIncome |
| 77 |
Attributable to: |
Abstract |
|
|
ifrs-full:ComprehensiveIncomeAttributableToAbstract |
| 78 |
Equity holders of the parent |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:ComprehensiveIncomeAttributableToOwnersOfParent |
| 79 |
Non-controlling interests |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:ComprehensiveIncomeAttributableToNoncontrollingInterests |
| 80 |
Total comprehensive income |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:ComprehensiveIncome |
| 81 |
1005 - Statement - Consolidated Balance Sheet |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/StatementOfFinancialPositionOrderOfLiquidity-220000 |
| 82 |
Implied Table |
Table |
* |
* |
implied:Table |
| 83 |
Statement of financial position [abstract] |
Abstract |
|
|
ifrs-full:StatementOfFinancialPositionAbstract |
| 84 |
Assets |
Abstract |
|
|
ifrs-full:AssetsAbstract |
| 85 |
Cash and balances at central banks |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:CashAndBankBalancesAtCentralBanks |
| 86 |
Financial assets at fair value through profit or loss: |
Abstract |
|
|
ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossAbstract |
| 87 |
- Trading assets |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTrading |
| 88 |
- Derivative financial instruments |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:DerivativeFinancialAssets |
| 89 |
- Other financial assets at fair value through profit or loss |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:OtherFinancialAssetsAtFairValueThroughProfitOrLoss |
| 90 |
Financial assets at amortised cost: |
Abstract |
|
|
ck0001087711:FinancialAssetsAtAmortisedCostAbstract |
| 91 |
- Loans and advances to customers |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:LoansAndAdvancesToCustomers |
| 92 |
- Loans and advances to banks |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:LoansAndAdvancesToBanks |
| 93 |
- Reverse repurchase agreements - non trading |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:ReverseRepurchaseAgreementsAndCashCollateralOnSecuritiesBorrowed |
| 94 |
- Other financial assets at amortised cost |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssetsAtAmortisedCost |
| 95 |
Financial assets at fair value through other comprehensive income |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncome |
| 96 |
Financial investments |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:FinancialInvestments |
| 97 |
Interests in other entities |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:InvestmentsInSubsidiariesJointVenturesAndAssociates |
| 98 |
Intangible assets |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:IntangibleAssetsAndGoodwill |
| 99 |
Property, plant and equipment |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:PropertyPlantAndEquipment |
| 100 |
Current tax assets |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:CurrentTaxAssets |
| 101 |
Retirement benefit assets |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:RecognisedAssetsDefinedBenefitPlan |
| 102 |
Other assets |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:OtherAssets |
| 103 |
Total assets |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:Assets |
| 104 |
Liabilities |
Abstract |
|
|
ifrs-full:LiabilitiesAbstract |
| 105 |
Financial liabilities at fair value through profit or loss: |
Abstract |
|
|
ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossAbstract |
| 106 |
- Trading liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossClassifiedAsHeldForTrading |
| 107 |
- Derivative financial instruments |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:DerivativeFinancialLiabilities |
| 108 |
- Other financial liabilities at fair value through profit or loss |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:OtherFinancialLiabilitiesAtFairValueThroughProfitOrLoss |
| 109 |
Financial liabilities at amortised cost: |
Abstract |
|
|
ck0001087711:FinancialLiabilitiesAtAmortisedCostAbstract |
| 110 |
- Deposits by customers |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:DepositsFromCustomers |
| 111 |
- Deposits by banks |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:DepositsFromBanks |
| 112 |
- Repurchase agreements - non trading |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:RepurchaseAgreementsAndCashCollateralOnSecuritiesLent |
| 113 |
- Debt securities in issue |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:DebtSecurities |
| 114 |
- Subordinated liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:SubordinatedLiabilities |
| 115 |
Other liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:OtherLiabilities |
| 116 |
Provisions |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:Provisions |
| 117 |
Current tax liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:CurrentTaxLiabilities |
| 118 |
Deferred tax liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:NetDeferredTaxLiabilities |
| 119 |
Retirement benefit obligations |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:RecognisedLiabilitiesDefinedBenefitPlan |
| 120 |
Total liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:Liabilities |
| 121 |
Equity |
Abstract |
|
|
ifrs-full:EquityAbstract |
| 122 |
Share capital |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:IssuedCapital |
| 123 |
Share premium |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:SharePremium |
| 124 |
Other equity instruments |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:OtherEquityInterest |
| 125 |
Retained earnings |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:RetainedEarnings |
| 126 |
Other reserves |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:OtherReserves |
| 127 |
Total shareholders' equity |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:EquityAttributableToOwnersOfParent |
| 128 |
Non-controlling interests |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:NoncontrollingInterests |
| 129 |
Total equity |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:Equity |
| 130 |
Total liabilities and equity |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:EquityAndLiabilities |
| 131 |
1006 - Statement - Consolidated Cash Flow Statement |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/StatementOfCashFlowsIndirectMethod-520000 |
| 132 |
Implied Table |
Table |
* |
* |
implied:Table |
| 133 |
Statement of cash flows [abstract] |
Abstract |
|
|
ifrs-full:StatementOfCashFlowsAbstract |
| 134 |
Cash flows from operating activities |
Abstract |
|
|
ifrs-full:CashFlowsFromUsedInOperatingActivitiesAbstract |
| 135 |
Profit after tax |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:ProfitLoss |
| 136 |
Non-cash items included in profit: |
Abstract |
|
|
ifrs-full:AdjustmentsForReconcileProfitLossAbstract |
| 137 |
- Depreciation and amortisation |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:AdjustmentsForDepreciationAndAmortisationExpense |
| 138 |
- Provisions for other liabilities and charges |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:AdjustmentsForProvisions |
| 139 |
- Impairment losses |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss |
| 140 |
- Corporation tax charge |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:AdjustmentsForIncomeTaxExpense |
| 141 |
- Other non-cash items |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:OtherAdjustmentsForNoncashItems |
| 142 |
- Pension charge for defined benefit pension schemes |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:AdjustmentsForPensionChargeForDefinedBenefitPensionSchemes |
| 143 |
Adjustments to reconcile profit (loss) |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:AdjustmentsForReconcileProfitLoss |
| 144 |
Net change in operating assets and liabilities: |
Abstract |
|
|
ck0001087711:ChangeInOperatingAssetsAndLiabilitiesAbstract |
| 145 |
- Cash and balances at central banks |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:AdjustmentsForDecreaseIncreaseInCashAndBalancesAtCentralBanks |
| 146 |
- Trading assets |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:AdjustmentsForDecreaseIncreaseInTradingAssets |
| 147 |
- Derivative assets |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:AdjustmentsForIncreaseDecreaseInDerivativeAssets |
| 148 |
- Other financial assets at fair value through profit or loss |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:AdjustmentsForDecreaseIncreaseInOtherFinancialAssetsAtFairValueThroughProfitOrLoss |
| 149 |
- Loans and advances to banks and customers |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:AdjustmentsForDecreaseIncreaseInLoansAndAdvancesToBanksAndCustomers |
| 150 |
- Other assets |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:AdjustmentsForDecreaseIncreaseInOtherAssets |
| 151 |
- Deposits by banks and customers |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:AdjustmentsForIncreaseDecreaseInDepositsFromBanksAndCustomers |
| 152 |
- Derivative liabilities |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:AdjustmentsForIncreaseDecreaseInDerivativeLiabilities |
| 153 |
- Trading liabilities |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:AdjustmentsForIncreaseDecreaseInTradingLiabilities |
| 154 |
- Other financial liabilities at fair value through profit or loss |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:AdjustmentsForIncreaseDecreaseInOtherFinancialLiabilitiesAtFairValueThroughProfitOrLoss |
| 155 |
- Debt securities in issue |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:AdjustmentsForIncreaseDecreaseInDebtSecuritiesInIssue |
| 156 |
- Other liabilities |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:AdjustmentsForIncreaseDecreaseInOtherLiabilities |
| 157 |
Net change in operating assets and liabilities |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:AdjustmentsForDecreaseIncreaseInOperatingAssetsAndLiabilities |
| 158 |
Corporation taxes paid |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:IncomeTaxesPaidRefundClassifiedAsOperatingActivities |
| 159 |
Effects of exchange rate differences |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:AdjustmentsForUnrealisedForeignExchangeLossesGains |
| 160 |
Net cash flows from operating activities |
Concept (Monetary) |
For Period |
|
ifrs-full:CashFlowsFromUsedInOperatingActivities |
| 161 |
Cash flows from investing activities |
Abstract |
|
|
ifrs-full:CashFlowsFromUsedInInvestingActivitiesAbstract |
| 162 |
Investments in other entities |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities |
| 163 |
Proceeds from disposal of subsidiaries |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:CashFlowsFromLosingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities |
| 164 |
Purchase of property, plant and equipment and intangible assets |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:PurchaseOfPropertyPlantAndEquipmentIntangibleAssetsOtherThanGoodwillInvestmentPropertyAndOtherNoncurrentAssets |
| 165 |
Proceeds from sale of property, plant and equipment and intangible assets |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:ProceedsFromDisposalsOfPropertyPlantAndEquipmentIntangibleAssetsOtherThanGoodwillInvestmentPropertyAndOtherNoncurrentAssets |
| 166 |
Purchase of financial investments |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:PurchasesOfFinancialInvestments |
| 167 |
Proceeds from sale and redemption of financial investments |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:ProceedsFromDisposalOrMaturityOfFinancialInvestments |
| 168 |
Net cash flows from investing activities |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:CashFlowsFromUsedInInvestingActivities |
| 169 |
Cash flows from financing activities |
Abstract |
|
|
ifrs-full:CashFlowsFromUsedInFinancingActivitiesAbstract |
| 170 |
Issue of AT1 Capital Securities |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:ProceedsFromIssuingOtherEquityInstruments |
| 171 |
Issuance costs of AT1 Capital Securities |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:PaymentForOtherEquityInstrumentsIssueCosts |
| 172 |
Issue of debt securities and subordinated notes |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:ProceedsFromIssueOfBondsNotesAndDebentures |
| 173 |
Issuance costs of debt securities and subordinated notes |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:PaymentsForDebtIssueCosts |
| 174 |
Repayment of debt securities and subordinated notes |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:RepaymentsOfBondsNotesAndDebentures |
| 175 |
Repurchase of preference shares and other equity instruments |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:PaymentsForRepurchaseOfPreferenceSharesAndOtherEquityInstruments |
| 176 |
Dividends paid on ordinary shares |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:DividendsPaidClassifiedAsFinancingActivities |
| 177 |
Dividends paid on preference shares and other equity instruments |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:DividendsPaidOnPreferenceSharesAndOtherEquityInstrumentsClassifiedAsFinancingActivities |
| 178 |
Dividends paid on non-controlling interests |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:DividendsPaidToNoncontrollingInterestsClassifiedAsFinancingActivities |
| 179 |
Net cash flows from financing activities |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:CashFlowsFromUsedInFinancingActivities |
| 180 |
Change in cash and cash equivalents |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges |
| 181 |
Cash and cash equivalents at beginning of the year |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition |
| 182 |
Effects of exchange rate changes on cash and cash equivalents |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:EffectOfExchangeRateChangesOnCashAndCashEquivalents |
| 183 |
Cash and cash equivalents at the end of the year |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition |
| 184 |
Cash and cash equivalents consist of: |
Abstract |
|
|
ifrs-full:CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPositionAbstract |
| 185 |
Cash and balances at central banks |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:CashAndBankBalancesAtCentralBanks |
| 186 |
Less: regulatory minimum cash balances |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:MandatoryReserveDepositsAtCentralBanks |
| 187 |
Cash and bank balances at central banks less regulatory minimum cash balances |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:BankBalancesAtCentralBanksOtherThanMandatoryReserveDeposits |
| 188 |
Net trading other cash equivalents |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:NetTradingAndOtherCashEquivalents |
| 189 |
Net non-trading other cash equivalents |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:NetNonTradingOtherCashEquivalents |
| 190 |
Cash and cash equivalents at the end of the year |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition |
| 191 |
Cash flows from investing activities |
Abstract |
|
|
ifrs-full:CashFlowsFromUsedInInvestingActivitiesAbstract |
| 192 |
Investments in other entities |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities |
| 193 |
Proceeds from disposal of subsidiaries |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:CashFlowsFromLosingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities |
| 194 |
Purchase of property, plant and equipment and intangible assets |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:PurchaseOfPropertyPlantAndEquipmentIntangibleAssetsOtherThanGoodwillInvestmentPropertyAndOtherNoncurrentAssets |
| 195 |
Proceeds from sale of property, plant and equipment and intangible assets |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:ProceedsFromDisposalsOfPropertyPlantAndEquipmentIntangibleAssetsOtherThanGoodwillInvestmentPropertyAndOtherNoncurrentAssets |
| 196 |
Purchase of financial investments |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:PurchasesOfFinancialInvestments |
| 197 |
Proceeds from sale and redemption of financial investments |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:ProceedsFromDisposalOrMaturityOfFinancialInvestments |
| 198 |
Net cash flows from investing activities |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:CashFlowsFromUsedInInvestingActivities |
| 199 |
1007 - Statement - Consolidated Cash Flow Statement (Parenthetical) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/StatementOfCashFlowsIndirectMethod-520000Parenthetical |
| 200 |
Implied Table |
Table |
* |
* |
implied:Table |
| 201 |
Statement of cash flows [abstract] |
Abstract |
|
|
ifrs-full:StatementOfCashFlowsAbstract |
| 202 |
Cash consideration received on sale of subsidiaries |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:CashFlowsFromLosingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities |
| 203 |
Carrying value of assets and liabilities |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:CarryingValueOfAssetsAndLiabilitiesOtherThanCashOrCashEquivalentsInSubsidiary |
| 204 |
1008 - Statement - Consolidated Statement of Changes in Equity |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/StatementOfChangesInEquity-610000 |
| 205 |
Statement of changes in equity [table] |
Table |
* |
* |
ifrs-full:StatementOfChangesInEquityTable |
| 206 |
Components of equity [axis] |
Axis |
|
|
ifrs-full:ComponentsOfEquityAxis |
| 207 |
Equity [member] |
Member |
|
|
ifrs-full:EquityMember |
| 208 |
Share Capital [member] |
Member |
|
|
ifrs-full:IssuedCapitalMember |
| 209 |
Share premium [member] |
Member |
|
|
ifrs-full:SharePremiumMember |
| 210 |
Other Equity Instruments [member] |
Member |
|
|
ifrs-full:OtherEquityInterestMember |
| 211 |
Other Reserves Available-For-Sale [member] |
Member |
|
|
ifrs-full:ReserveOfGainsAndLossesOnRemeasuringAvailableforsaleFinancialAssetsMember |
| 212 |
Other Reserves Fair Value Reserves [member] |
Member |
|
|
ifrs-full:ReserveOfGainsAndLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeMember |
| 213 |
Other Reserves Cash Flow Hedging [member] |
Member |
|
|
ifrs-full:ReserveOfCashFlowHedgesMember |
| 214 |
Other Reserves Currency Translation [member] |
Member |
|
|
ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember |
| 215 |
Retained Earnings [member] |
Member |
|
|
ifrs-full:RetainedEarningsMember |
| 216 |
Total [member] |
Member |
|
|
ifrs-full:EquityAttributableToOwnersOfParentMember |
| 217 |
Non-Controlling Interests [member] |
Member |
|
|
ifrs-full:NoncontrollingInterestsMember |
| 218 |
Statement of changes in equity [line items] |
LineItems |
|
|
ifrs-full:StatementOfChangesInEquityLineItems |
| 219 |
Beginning balance |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:Equity |
| 220 |
Profit after tax |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:ProfitLoss |
| 221 |
Adoption of IFRS 9 (see Note 1) |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:AdjustmentForAdoptionOfIFRS9 |
| 222 |
Other comprehensive income, net of tax: |
Abstract |
|
|
ifrs-full:OtherComprehensiveIncomeAbstract |
| 223 |
- Available-for-sale securities |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:OtherComprehensiveIncomeNetOfTaxAvailableforsaleFinancialAssets |
| 224 |
- Fair value reserve (debt instruments) |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:GainsLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeNetOfTax |
| 225 |
- Cash flow hedges |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:OtherComprehensiveIncomeNetOfTaxCashFlowHedges |
| 226 |
- Pension remeasurement |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans |
| 227 |
- Own credit adjustment |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:OtherComprehensiveIncomeNetOfTaxChangeInFairValueOfFinancialLiabilityAttributableToChangeInCreditRiskOfLiability |
| 228 |
- Currency translation on foreign operations |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation |
| 229 |
Total comprehensive income |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:ComprehensiveIncome |
| 230 |
Issue of AT1 capital securities |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:IssueOfEquity |
| 231 |
Other |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesEquity |
| 232 |
Repurchase of other equity instruments |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:RepurchaseOfOtherEquityInstruments |
| 233 |
Dividends on ordinary shares |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:DividendsRecognisedAsDistributionsToOwnersOfParent |
| 234 |
Dividends on preference shares and other equity instruments |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:DividendsOnPreferenceSharesAndOtherEquityInstruments |
| 235 |
Dividends on non-controlling interests |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:DividendsRecognisedAsDistributionsToNoncontrollingInterests |
| 236 |
Tax on other equity instruments |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:TaxOnOtherEquityInstruments |
| 237 |
Ending balance |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:Equity |
| 238 |
1009 - Disclosure - Risk Framework |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfFinancialRiskManagementExplanatory |
| 239 |
Implied Table |
Table |
* |
* |
implied:Table |
| 240 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 241 |
Risk Framework |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfFinancialRiskManagementExplanatory |
| 242 |
1010 - Disclosure - Credit risk |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfCreditRiskExplanatory |
| 243 |
Implied Table |
Table |
* |
* |
implied:Table |
| 244 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 245 |
Credit risk |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfCreditRiskExplanatory |
| 246 |
1011 - Disclosure - Market risk |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfMarketRiskExplanatory |
| 247 |
Implied Table |
Table |
* |
* |
implied:Table |
| 248 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 249 |
Market risk |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfMarketRiskExplanatory |
| 250 |
1012 - Disclosure - Liquidity risk |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfLiquidityRiskExplanatory |
| 251 |
Implied Table |
Table |
* |
* |
implied:Table |
| 252 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 253 |
Liquidity risk |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfLiquidityRiskExplanatory |
| 254 |
1013 - Disclosure - Capital risk |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfCapitalRiskExplanatory |
| 255 |
Implied Table |
Table |
* |
* |
implied:Table |
| 256 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 257 |
Capital risk |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfCapitalRiskExplanatory |
| 258 |
1014 - Disclosure - Accounting Policies |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory |
| 259 |
Implied Table |
Table |
* |
* |
implied:Table |
| 260 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 261 |
Accounting Policies |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory |
| 262 |
1015 - Disclosure - Segments |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfEntitysReportableSegmentsExplanatory |
| 263 |
Implied Table |
Table |
* |
* |
implied:Table |
| 264 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 265 |
Segments |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfEntitysReportableSegmentsExplanatory |
| 266 |
1016 - Disclosure - Net Interest Income |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfInterestIncomeExpenseExplanatory |
| 267 |
Implied Table |
Table |
* |
* |
implied:Table |
| 268 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 269 |
Net Interest Income |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfInterestIncomeExpenseExplanatory |
| 270 |
1017 - Disclosure - Net Fee and Commission Income |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfFeeAndCommissionIncomeExpenseExplanatory |
| 271 |
Implied Table |
Table |
* |
* |
implied:Table |
| 272 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 273 |
Net Fee and Commission Income |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfFeeAndCommissionIncomeExpenseExplanatory |
| 274 |
1018 - Disclosure - Net Trading and Other Income |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfTradingIncomeExpenseAndOtherOperatingIncomeExpenseExplanatory |
| 275 |
Implied Table |
Table |
* |
* |
implied:Table |
| 276 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 277 |
Net Trading and Other Income |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfTradingIncomeExpenseAndOtherOperatingIncomeExpenseExplanatory |
| 278 |
1019 - Disclosure - Operating Expenses Before Credit Impairment Losses, Provisions and Charges |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfExpensesExplanatory |
| 279 |
Implied Table |
Table |
* |
* |
implied:Table |
| 280 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 281 |
Operating Expenses Before Credit Impairment Losses, Provisions and Charges |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfExpensesExplanatory |
| 282 |
1020 - Disclosure - Audit and Other Services |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfAuditorsRemunerationExplanatory |
| 283 |
Implied Table |
Table |
* |
* |
implied:Table |
| 284 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 285 |
Audit and Other Services |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfAuditorsRemunerationExplanatory |
| 286 |
1021 - Disclosure - Credit Impairment Losses and Provisions |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfImpairmentLossesOnFinancialAssetsAndProvisionsExplanatory |
| 287 |
Implied Table |
Table |
* |
* |
implied:Table |
| 288 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 289 |
Credit Impairment Losses and Provisions |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfImpairmentLossesOnFinancialAssetsAndProvisionsExplanatory |
| 290 |
1022 - Disclosure - Taxation |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfIncomeTaxAndDeferredTaxesExplanatory |
| 291 |
Implied Table |
Table |
* |
* |
implied:Table |
| 292 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 293 |
Taxation |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfIncomeTaxAndDeferredTaxesExplanatory |
| 294 |
1023 - Disclosure - Dividends on Ordinary Shares |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfDividendsExplanatory |
| 295 |
Implied Table |
Table |
* |
* |
implied:Table |
| 296 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 297 |
Dividends on Ordinary Shares |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfDividendsExplanatory |
| 298 |
1024 - Disclosure - Trading Assets |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfFinancialAssetsHeldForTradingExplanatory |
| 299 |
Implied Table |
Table |
* |
* |
implied:Table |
| 300 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 301 |
Trading Assets |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfFinancialAssetsHeldForTradingExplanatory |
| 302 |
1025 - Disclosure - Derivative Financial Instruments |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfDerivativeFinancialInstrumentsExplanatory |
| 303 |
Implied Table |
Table |
* |
* |
implied:Table |
| 304 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 305 |
Derivative Financial Instruments |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfDerivativeFinancialInstrumentsExplanatory |
| 306 |
1026 - Disclosure - Other Financial Assets At Fair Value Through Profit Or Loss |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfFinancialInstrumentsAtFairValueThroughProfitOrLossExplanatory |
| 307 |
Implied Table |
Table |
* |
* |
implied:Table |
| 308 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 309 |
Other Financial Assets At Fair Value Through Profit Or Loss |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfFinancialInstrumentsAtFairValueThroughProfitOrLossExplanatory |
| 310 |
1027 - Disclosure - Loans and Advances to Customers |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfLoansAndAdvancesToCustomersExplanatory |
| 311 |
Implied Table |
Table |
* |
* |
implied:Table |
| 312 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 313 |
Loans and Advances to Customers |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfLoansAndAdvancesToCustomersExplanatory |
| 314 |
1028 - Disclosure - Securitisations and Covered Bonds |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfSecuritisationsAndCoveredBondsExplanatory |
| 315 |
Implied Table |
Table |
* |
* |
implied:Table |
| 316 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 317 |
Securitisations and Covered Bonds |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfSecuritisationsAndCoveredBondsExplanatory |
| 318 |
1029 - Disclosure - Transfers of Financial Assets Not Qualifying for Derecognition |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfFinancialAssetsTransferredDuringPeriodWhichDoNotQualifyForDerecognitionExplanatory |
| 319 |
Implied Table |
Table |
* |
* |
implied:Table |
| 320 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 321 |
Transfers of Financial Assets Not Qualifying for Derecognition |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfFinancialAssetsTransferredDuringPeriodWhichDoNotQualifyForDerecognitionExplanatory |
| 322 |
1030 - Disclosure - Reverse Repurchase Agreements - Non Trading |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfReverseRepurchaseAgreementsNontradingExplanatory |
| 323 |
Statement [table] |
Table |
* |
* |
ck0001087711:StatementTable |
| 324 |
Classes of financial instruments [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialInstrumentsAxis |
| 325 |
Financial instruments, class [member] |
Member |
|
|
ifrs-full:ClassesOfFinancialInstrumentsMember |
| 326 |
Reverse repurchase agreements - non-trading [member] |
Member |
|
|
ck0001087711:ReverseRepurchaseAgreementsNontradingMember |
| 327 |
Statement [LineItems] |
LineItems |
|
|
ck0001087711:StatementLineItems |
| 328 |
Reverse Repurchase Agreements - Non Trading |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfReverseRepurchaseAgreementsNontradingExplanatory |
| 329 |
1031 - Disclosure - Other Financial Assets At Amortised Cost |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfOtherFinancialAssetsAtAmortisedCostExplanatory |
| 330 |
Implied Table |
Table |
* |
* |
implied:Table |
| 331 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 332 |
Other Financial Assets At Amortised Cost |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfOtherFinancialAssetsAtAmortisedCostExplanatory |
| 333 |
1032 - Disclosure - Financial Assets At Fair Value Through Other Comprehensive Income |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfFinancialAssetsAtFairValueThroughOtherComprehensiveIncomeExplanatory |
| 334 |
Implied Table |
Table |
* |
* |
implied:Table |
| 335 |
Text block [abstract] |
Abstract |
|
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ck0001087711:TextBlockAbstract |
| 336 |
Financial Assets At Fair Value Through Other Comprehensive Income |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfFinancialAssetsAtFairValueThroughOtherComprehensiveIncomeExplanatory |
| 337 |
1033 - Disclosure - Financial Investments |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfFinancialInvestmentsExplanatory |
| 338 |
Implied Table |
Table |
* |
* |
implied:Table |
| 339 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 340 |
Financial Investments |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfFinancialInvestmentsExplanatory |
| 341 |
1034 - Disclosure - Interests in Other Entities |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfInterestsInOtherEntitiesExplanatory |
| 342 |
Implied Table |
Table |
* |
* |
implied:Table |
| 343 |
Investments accounted for using equity method [abstract] |
Abstract |
|
|
ifrs-full:InvestmentsAccountedForUsingEquityMethodAbstract |
| 344 |
Interests in Other Entities |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfInterestsInOtherEntitiesExplanatory |
| 345 |
1035 - Disclosure - Intangible Assets |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfIntangibleAssetsAndGoodwillExplanatory |
| 346 |
Implied Table |
Table |
* |
* |
implied:Table |
| 347 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 348 |
Intangible Assets |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfIntangibleAssetsAndGoodwillExplanatory |
| 349 |
1036 - Disclosure - Trading Liabilities |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfFinancialLiabilitiesHeldForTradingExplanatory |
| 350 |
Implied Table |
Table |
* |
* |
implied:Table |
| 351 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 352 |
Trading Liabilities |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfFinancialLiabilitiesHeldForTradingExplanatory |
| 353 |
1037 - Disclosure - Other Financial Liabilities at Fair Value Through Profit or Loss |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfOtherFinancialLiabilitiesAtFairValueThroughProfitOrLossExplanatory |
| 354 |
Implied Table |
Table |
* |
* |
implied:Table |
| 355 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 356 |
Other Financial Liabilities at Fair Value Through Profit or Loss |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfOtherFinancialLiabilitiesAtFairValueThroughProfitOrLossExplanatory |
| 357 |
1038 - Disclosure - Deposits by Customers |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfDepositsFromCustomersExplanatory |
| 358 |
Implied Table |
Table |
* |
* |
implied:Table |
| 359 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 360 |
Deposits by Customers |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfDepositsFromCustomersExplanatory |
| 361 |
1039 - Disclosure - Deposits by Banks |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfDepositsFromBanksExplanatory |
| 362 |
Implied Table |
Table |
* |
* |
implied:Table |
| 363 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 364 |
Deposits by Banks |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfDepositsFromBanksExplanatory |
| 365 |
1040 - Disclosure - Repurchase Agreements - Non Trading |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfRepurchaseAgreementsNontradingExplanatory |
| 366 |
Implied Table |
Table |
* |
* |
implied:Table |
| 367 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 368 |
Repurchase Agreements - Non Trading |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfRepurchaseAgreementsNontradingExplanatory |
| 369 |
1041 - Disclosure - Debt Securities in Issue |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfDebtSecuritiesExplanatory |
| 370 |
Implied Table |
Table |
* |
* |
implied:Table |
| 371 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 372 |
Debt Securities in Issue |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfDebtSecuritiesExplanatory |
| 373 |
1042 - Disclosure - Subordinated Liabilities |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfSubordinatedLiabilitiesExplanatory |
| 374 |
Implied Table |
Table |
* |
* |
implied:Table |
| 375 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 376 |
Subordinated Liabilities |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfSubordinatedLiabilitiesExplanatory |
| 377 |
1043 - Disclosure - Provisions |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfProvisionsExplanatory |
| 378 |
Implied Table |
Table |
* |
* |
implied:Table |
| 379 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 380 |
Provisions |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfProvisionsExplanatory |
| 381 |
1044 - Disclosure - Retirement Benefit Plans |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfEmployeeBenefitsExplanatory |
| 382 |
Implied Table |
Table |
* |
* |
implied:Table |
| 383 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 384 |
Retirement Benefit Plans |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfEmployeeBenefitsExplanatory |
| 385 |
1045 - Disclosure - Contingent Liabilities And Commitments |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfCommitmentsAndContingentLiabilitiesExplanatory |
| 386 |
Implied Table |
Table |
* |
* |
implied:Table |
| 387 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 388 |
Contingent Liabilities And Commitments |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfCommitmentsAndContingentLiabilitiesExplanatory |
| 389 |
1046 - Disclosure - Share Capital |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfIssuedCapitalExplanatory |
| 390 |
Implied Table |
Table |
* |
* |
implied:Table |
| 391 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 392 |
Share Capital |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfIssuedCapitalExplanatory |
| 393 |
1047 - Disclosure - Other Equity Instruments |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfOtherEquityInstrumentsExplanatory |
| 394 |
Implied Table |
Table |
* |
* |
implied:Table |
| 395 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 396 |
Other Equity Instruments |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfOtherEquityInstrumentsExplanatory |
| 397 |
1048 - Disclosure - Non-Controlling Interests |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfNoncontrollingInterestsExplanatory |
| 398 |
Implied Table |
Table |
* |
* |
implied:Table |
| 399 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 400 |
Non-Controlling Interests |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfNoncontrollingInterestsExplanatory |
| 401 |
1049 - Disclosure - Changes in Liabilities Arising from Financing Activities |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfReconciliationOfLiabilityArisingFromFinancingActivitiesExplanatory |
| 402 |
Implied Table |
Table |
* |
* |
implied:Table |
| 403 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 404 |
Changes in Liabilities Arising from Financing Activities |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfReconciliationOfLiabilityArisingFromFinancingActivitiesExplanatory |
| 405 |
1050 - Disclosure - Assets Charged As Security For Liabilities And Collateral Accepted As Security For Assets |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfCollateralExplanatory |
| 406 |
Implied Table |
Table |
* |
* |
implied:Table |
| 407 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 408 |
Assets Charged As Security For Liabilities And Collateral Accepted As Security For Assets |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfCollateralExplanatory |
| 409 |
1051 - Disclosure - Share-Based Compensation |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfSharebasedPaymentArrangementsExplanatory |
| 410 |
Implied Table |
Table |
* |
* |
implied:Table |
| 411 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 412 |
Share-Based Compensation |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfSharebasedPaymentArrangementsExplanatory |
| 413 |
1052 - Disclosure - Transactions With Directors and Other Key Management Personnel |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfInformationAboutKeyManagementPersonnelExplanatory |
| 414 |
Implied Table |
Table |
* |
* |
implied:Table |
| 415 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 416 |
Transactions With Directors and Other Key Management Personnel |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfInformationAboutKeyManagementPersonnelExplanatory |
| 417 |
1053 - Disclosure - Related Party Disclosures |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfRelatedPartyExplanatory |
| 418 |
Implied Table |
Table |
* |
* |
implied:Table |
| 419 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 420 |
Related Party Disclosures |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfRelatedPartyExplanatory |
| 421 |
1054 - Disclosure - Financial Instruments |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfFinancialInstrumentsExplanatory |
| 422 |
Implied Table |
Table |
* |
* |
implied:Table |
| 423 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 424 |
Financial Instruments |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfFinancialInstrumentsExplanatory |
| 425 |
1055 - Disclosure - Offsetting Financial Assets and Liabilities |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfOffsettingOfFinancialAssetsAndFinancialLiabilitiesExplanatory |
| 426 |
Implied Table |
Table |
* |
* |
implied:Table |
| 427 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 428 |
Offsetting Financial Assets and Liabilities |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfOffsettingOfFinancialAssetsAndFinancialLiabilitiesExplanatory |
| 429 |
1056 - Disclosure - Ring-Fencing |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfRingFencingExplanatory |
| 430 |
Implied Table |
Table |
* |
* |
implied:Table |
| 431 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 432 |
Ring-Fencing |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfRingFencingExplanatory |
| 433 |
1057 - Disclosure - Transition to IFRS 9 |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfImpactOfAdoptionOfIFRS9Explanatory |
| 434 |
Implied Table |
Table |
* |
* |
implied:Table |
| 435 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 436 |
Transition to IFRS 9 |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfImpactOfAdoptionOfIFRS9Explanatory |
| 437 |
1058 - Disclosure - Events After the Balance Sheet Date |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfEventsAfterReportingPeriodExplanatory |
| 438 |
Implied Table |
Table |
* |
* |
implied:Table |
| 439 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 440 |
Events After the Balance Sheet Date |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfEventsAfterReportingPeriodExplanatory |
| 441 |
1059 - Disclosure - Accounting Policies (Policies) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfSummaryOfSignificantAccountingPoliciesExplanatoryPolicies |
| 442 |
Implied Table |
Table |
* |
* |
implied:Table |
| 443 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 444 |
Basis of preparation |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfBasisOfPreparationOfFinancialStatementsExplanatory |
| 445 |
Consolidation |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DescriptionOfAccountingPolicyForConsolidationTextBlock |
| 446 |
Foreign currency translation |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory |
| 447 |
Revenue recognition |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DescriptionOfAccountingPolicyForRecognitionOfRevenue |
| 448 |
Borrowing costs |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DescriptionOfAccountingPolicyForBorrowingCostsExplanatory |
| 449 |
Pensions and other post-retirement benefits |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DescriptionOfAccountingPolicyForEmployeeBenefitsExplanatory |
| 450 |
Share-based payments |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory |
| 451 |
Goodwill and other intangible assets |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DescriptionOfAccountingPolicyForIntangibleAssetsAndGoodwillExplanatory |
| 452 |
Property, plant and equipment |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory |
| 453 |
Financial instruments |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory |
| 454 |
Derivative financial instruments |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DescriptionOfAccountingPolicyForDerivativeFinancialInstrumentsExplanatory |
| 455 |
Offsetting financial assets and liabilities |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DescriptionOfAccountingPolicyForOffsettingOfFinancialInstrumentsExplanatory |
| 456 |
Hedge accounting |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DescriptionOfAccountingPolicyForHedgingExplanatory |
| 457 |
Securitisation transactions |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DescriptionOfAccountingPolicyForSecuritisationTransactionsExplanatory |
| 458 |
Impairment of non-financial assets |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DescriptionOfAccountingPolicyForImpairmentOfNonfinancialAssetsExplanatory |
| 459 |
Leases |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DescriptionOfAccountingPolicyForLeasesExplanatory |
| 460 |
Income taxes, including deferred taxes |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DescriptionOfAccountingPolicyForIncomeTaxAndDeferredIncomeTaxExplanatory |
| 461 |
Cash and cash equivalents |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DescriptionOfAccountingPolicyToDetermineComponentsOfCashAndCashEquivalents |
| 462 |
Provisions |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DescriptionOfAccountingPolicyForProvisionsExplanatory |
| 463 |
Share capital |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DescriptionOfAccountingPolicyForIssuedCapitalExplanatory |
| 464 |
Accounting policies relating to comparatives - IAS 39: Financial Instruments: Recognition and Measurement |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DescriptionOfAccountingPolicyForFinancialInstrumentsRecognitionAndMeasurementExplanatory |
| 465 |
Critical Judgements and Accounting Estimates |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfAccountingJudgementsAndEstimatesExplanatory |
| 466 |
1060 - Disclosure - Credit risk (Tables) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfCreditRiskExplanatoryTables |
| 467 |
Statement [table] |
Table |
* |
* |
ck0001087711:StatementTable |
| 468 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 469 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 470 |
Mortgages [member] |
Member |
|
|
ifrs-full:MortgagesMember |
| 471 |
Other business segments [member] |
Member |
|
|
ck0001087711:OtherBusinessSegmentsMember |
| 472 |
Corporate and investment banking [member] |
Member |
|
|
ck0001087711:CorporateAndInvestmentBankingMember |
| 473 |
Retail banking [member] |
Member |
|
|
ck0001087711:RetailBankingMember |
| 474 |
Consumer (auto) finance [member] |
Member |
|
|
ck0001087711:ConsumerFinanceMember |
| 475 |
Business Banking [member] |
Member |
|
|
ck0001087711:BusinessBankingMember |
| 476 |
Statement [LineItems] |
LineItems |
|
|
ck0001087711:StatementLineItems |
| 477 |
Summary of Exposures to Credit Risk in Business Segments |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfCreditRiskExposureExplanatory |
| 478 |
Types Of Customers And HowTo Manage Them |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:TypesOfCustomersAndHowToManageThemExplanatory |
| 479 |
Summary of Key Metrics to Measure and Control Credit Risk |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfKeyCreditRiskMetricsExplanatoryExplanatory |
| 480 |
Summary of Annual Growth Rates |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfAnnualGrowthRatesForecastExplanatory |
| 481 |
Summary of Probability Weightings Applied to Scenarios |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfProbabilityWeightingsOfScenariosExplanatory |
| 482 |
Summary of Quantitative Criteria to Measure Significant Increase in Credit Risk |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfQuantitativeCriteriaToMeasureSignificantIncreaseInCreditRiskExplanatory |
| 483 |
Summary of Qualitative Criteria to Measure Significant Increase in Credit Risk |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfQualitativeCriteriaToMeasureSignificantIncreaseInCreditRiskExplanatory |
| 484 |
Summary of Difference Between Maximum and Net Exposure to Credit Risk |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfDifferenceBetweenMaximumAndNetExposureToCreditRiskExplanatory |
| 485 |
Summary of Difference Between Maximum and Net Exposure to Credit Risk |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfDifferenceBetweenMaximumAndNetExposureToCreditRiskOnAssetsMeasuredAtFVTPLExplanatory |
| 486 |
Summary of Credit Rating of Financial Assets Subject to Credit Risk |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfCreditRatingOfFinancialAssetsSubjectToCreditRiskExplanatory |
| 487 |
Summary of Credit Performance |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfCreditPerformanceExplanatory |
| 488 |
Summary of IFRS 9 Credit Quality |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:SummaryOfIFRS9CreditQualityExplanatory |
| 489 |
Summary of Stage 2 Decomposition |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfStageTwoDecompositionExplanatory |
| 490 |
Summary of Reconciliation of Exposures, ECL and Net Carrying Amounts |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfReconciliationOfExposuresECLAndNetCarryingAmountsExplanatory |
| 491 |
Summary of ECL Reconciliation |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfReconciliationOfChangesInLossAllowanceAndExplanationOfChangesInGrossCarryingAmountForFinancialInstrumentsExplanatory |
| 492 |
Summary of Country Risk Explosures |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfCountryRiskExposuresExplanatory |
| 493 |
Summary of Balances with Other Banco Santander Companies |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosuresOfBalancesWithOtherBancoSantanderEntitiesExplanatory |
| 494 |
Summary of Types of Credit Risk Mitigation |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfTypesOfCreditRiskMitigationExplanatory |
| 495 |
Summary of Residential Mortgages by Borrower Profile |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfResidentialMortgageLoansByBorrowerProfileExplanatory |
| 496 |
Summary of Residential Mortgages by Interest Rate Profile |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfResidentialMortgagesByInterestRateProfileExplanatory |
| 497 |
Summary of Residential Mortgages by Geographical Distribution |
Concept (Text Block (HTML)) |
For Period |
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| 498 |
Summary of Residential Mortgages by Average Loan Size for New Business |
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| 499 |
Summary of Residential Mortgages by Loan Size |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfResidentialMortgageLoansByLoanSizeExplanatory |
| 500 |
Summary of Residential Mortgages by Loan to Value |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfResidentialMortgagesByLoanToValueExplanatory |
| 501 |
Summary of Residential Mortgages by Credit Performance |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfResidentialMortgagesbyCreditPerformanceExplanatory |
| 502 |
Summary of Modification of Loan Terms |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfModificationOfLoanTermsExplanatory |
| 503 |
Summary of Residential Mortgages by Forbearance Applied |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfResidentialMortgagesByForbearanceAppliedExplanatory |
| 504 |
Summary of Residential Mortgages Portfolios of Particular Interest by Credit Performance |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfResidentialMortgagesPortfoliosOfParticularInterestByCreditPerformanceExplanatory |
| 505 |
Summary of Residential Mortgages Portfolios of Particular Interest by Forbearance Applied |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfResidentialMortgagesPortfoliosOfParticularInterestByForbearanceAppliedExplanatory |
| 506 |
Summary of Consumer (Auto) Finance and Other Unsecured Lending by Credit Performance |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfConsumerAutoFinanceAndOtherUnsecuredLendingByCreditPerformanceExplanatory |
| 507 |
Summary of Consumer (Auto) Finance and Other Unsecured Lending By Forbearance |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfConsumerAutoFinanceAndOtherUnsecuredLendingByForbearanceExplanatory |
| 508 |
Summary of Business Banking by Credit Performance |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfBusinessBankingByCreditPerformanceExplanatoryTextBlock |
| 509 |
Summary of Business Banking by Forbearance |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfBusinessBankingByForbearanceExplanatoryTextBlock |
| 510 |
Summary of Other Segments Exposures By Credit Rating |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfOtherSegmentExposuresByCreditRatingExplanatory |
| 511 |
Summary of Other Segments Exposures by Geographical Distribution |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfOtherSegmentsExposuresByGeographicalDistributionExplanatory |
| 512 |
Summary of Other Segments Exposures by Credit Performance |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfOtherSegmentsExposuresByCreditPerformanceExplanatory |
| 513 |
Summary of Other Segments by Forbearance Applied |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfOtherSegmentByForbearanceAppliedExplanatory |
| 514 |
Summary of Commercial Real Estate by Credit Performance |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfCommercialRealEstateByCreditPerformanceExplanatory |
| 515 |
Summary of Commercial Real Estate by Loan to Value |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfCommercialRealEstateByLoanToValueExplanatory |
| 516 |
Summary of Commercial Real Estate by Sector |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfCommercialRealEstateBySectorExplanatory |
| 517 |
Social Housing Exposure |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfSocialHousingExposureExplanatory |
| 518 |
1061 - Disclosure - Market risk (Tables) |
Network |
* |
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Implied Table |
Table |
* |
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implied:Table |
| 520 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 521 |
Summary of Balance Sheet Allocation by Market Risk Classification |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfBalanceSheetAllocationByMarketRiskClassificationExplanatory |
| 522 |
Summary of NIM and EVE Sensitivity of Interest Rate Risk |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfNimAndEveSensitivityOfInterestRateRiskExplanatory |
| 523 |
Summary of Internal VaR for Exposure to Main Classes of Risk |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfInternalVarForExposureToMainClassesOfRiskExplanatory |
| 524 |
1062 - Disclosure - Liquidity risk (Tables) |
Network |
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| 525 |
Implied Table |
Table |
* |
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implied:Table |
| 526 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 527 |
Summary of Reconciliation of Wholesale Funding to Balance Sheet |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfReconciliationOfWholesaleFundingToBalanceSheetExplanatory |
| 528 |
Summary of Sources of Wholesale Funding by Maturity |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfWholesaleFundingByMaturityExplanatory |
| 529 |
Summary of Wholesale Funding by Currency |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfCurrencyCompositionOfWholesaleFundingExplanatory |
| 530 |
Summary of External Term Issuance (Sterling Equivalent) |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfTermIssuanceExplanatory |
| 531 |
1063 - Disclosure - Capital risk (Tables) |
Network |
* |
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| 532 |
Implied Table |
Table |
* |
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implied:Table |
| 533 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 534 |
Summary of Regulatory Capital Resources |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfRegulatoryCapitalResourcesExplanatory |
| 535 |
1064 - Disclosure - Accounting Policies (Tables) |
Network |
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Implied Table |
Table |
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implied:Table |
| 537 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 538 |
Schedule of Useful Lives or Depreciation Rates Used for Property, Plant and Equipment |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfUsefulLivesOrDepreciationRatesPropertyPlantAndEquipmentExplanatory |
| 539 |
Summary of Probability Weights Applied for Each Scenario of Expected Credit Losses Allowance |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfBaseExpectedCreditLossesToProbabilityWeightedEstimatedCreditLossesExplanatory |
| 540 |
1065 - Disclosure - Segments (Tables) |
Network |
* |
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| 541 |
Implied Table |
Table |
* |
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implied:Table |
| 542 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 543 |
Summary of Results by Segment |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:SummaryOfResultsBySegmentExplanatory |
| 544 |
1066 - Disclosure - Net Interest Income (Tables) |
Network |
* |
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http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfInterestIncomeExpenseExplanatoryTables |
| 545 |
Implied Table |
Table |
* |
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implied:Table |
| 546 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 547 |
Summary of Net Interest Income |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfNetInterestIncomeExplanatory |
| 548 |
1067 - Disclosure - Net Fee and Commission Income (Tables) |
Network |
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Implied Table |
Table |
* |
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implied:Table |
| 550 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 551 |
Summary of Net Fee and Commission Income |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfNetFeeAndCommissionIncomeExplanatory |
| 552 |
1068 - Disclosure - Net Trading and Other Income (Tables) |
Network |
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| 553 |
Implied Table |
Table |
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implied:Table |
| 554 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 555 |
Summary of Net Trading and Other Income |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfNetTradingAndOtherIncomeExplanatory |
| 556 |
1069 - Disclosure - Operating Expenses Before Credit Impairment Losses, Provisions and Charges (Tables) |
Network |
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http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfExpensesExplanatoryTables |
| 557 |
Implied Table |
Table |
* |
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implied:Table |
| 558 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 559 |
Summary of Operating Expenses Before Credit Impairment Losses, Provisions and Charges |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfOperatingExpensesBeforeImpairmentLossesProvisionsAndChargesExplanatory |
| 560 |
Summary of Deferred Performance Awards |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DeferredPerformanceAwardsExplanatory |
| 561 |
Summary of Amount of Bonus Awarded to Employees |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfAmountOfBonusAwardedToEmployeesExplanatory |
| 562 |
1070 - Disclosure - Audit and Other Services (Tables) |
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| 563 |
Implied Table |
Table |
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implied:Table |
| 564 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 565 |
Summary of Audit and Other Services |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfAuditAndOtherServicesExplanatory |
| 566 |
1071 - Disclosure - Credit Impairment Losses and Provisions (Tables) |
Network |
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http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfImpairmentLossesOnFinancialAssetsAndProvisionsExplanatoryTables |
| 567 |
Implied Table |
Table |
* |
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implied:Table |
| 568 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 569 |
Summary of Impairment Losses and Provisions |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfDetailedInformationOfImpairmentLossesAndProvisionsExplanatory |
| 570 |
1072 - Disclosure - Taxation (Tables) |
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| 571 |
Implied Table |
Table |
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implied:Table |
| 572 |
Text block [abstract] |
Abstract |
|
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ck0001087711:TextBlockAbstract |
| 573 |
Disclosure of Tax on Profit |
Concept (Text Block (HTML)) |
For Period |
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ifrs-full:DisclosureOfIncomeTaxExplanatory |
| 574 |
Schedule of Tax on Profit Before Tax Differs from Theoretical Amount that Arise Using Basic Corporation Tax Rate |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfReconciliationOfChargeResultingFromApplyingUkCorporationTaxRateExplanatory |
| 575 |
Disclosure of Movements in Current Tax Assets and Liabilities |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfMovementInCurrentTaxAssetsAndLiabilitiesExplanatory |
| 576 |
Disclosure of Deferred Tax Assets and Liabilities Including Movement in Deferred Tax Account |
Concept (Text Block (HTML)) |
For Period |
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ifrs-full:DisclosureOfDeferredTaxesExplanatory |
| 577 |
1073 - Disclosure - Dividends on Ordinary Shares (Tables) |
Network |
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http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfDividendsExplanatoryTables |
| 578 |
Implied Table |
Table |
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implied:Table |
| 579 |
Text block [abstract] |
Abstract |
|
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ck0001087711:TextBlockAbstract |
| 580 |
Disclosure of Dividends on Ordinary Shares Declared and Paid |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfDividendPerOrdinaryShareExplanatory |
| 581 |
1074 - Disclosure - Trading Assets (Tables) |
Network |
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| 582 |
Implied Table |
Table |
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implied:Table |
| 583 |
Text block [abstract] |
Abstract |
|
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ck0001087711:TextBlockAbstract |
| 584 |
Disclosure of Trading Assets |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfTradingAssetsExplanatory |
| 585 |
1075 - Disclosure - Derivative Financial Instruments (Tables) |
Network |
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http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfDerivativeFinancialInstrumentsExplanatoryTables |
| 586 |
Implied Table |
Table |
* |
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implied:Table |
| 587 |
Text block [abstract] |
Abstract |
|
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ck0001087711:TextBlockAbstract |
| 588 |
Notional Amounts and Fair Values of Derivatives |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfNotionalAndFairValueAmountsOfDerivativeFinancialInstrumentsExplanatory |
| 589 |
Analysis of the Notional and Fair Values of Derivatives by Trading and Settlement Method |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfAnalysisOfTheNotionalAndFairValuesOfDerivativesByTradingAndSettlementMethodExplanatory |
| 590 |
Summary of Fixed Rate Hedged Instruments |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfFixedRateInstrumentsHedgedExplanatory |
| 591 |
Summary of Possible Sources of Hedge ineffectiveness |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfPossibleSourcesOfHedgeInEffectivenessExplanatory |
| 592 |
Summary of Maturity Profile and Average Price/Rate of Hedging Instruments Used in Hedging Strategies |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfMaturityProfileAndAveragePriceRateOfHedgingInstrumentsUsedInHedgingStrategiesExplanatory |
| 593 |
Summary of Net Gains Or Losses Arising from Fair Value and Cash Flow Hedges Included in Net Trading and Other Income |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfDetailedInformationAboutHedgesExplanatory |
| 594 |
Summary of Information About Hedging Ineffectiveness by Risk Category |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfInformationAboutHedgingIneffectivenessByRiskCategoryExplanatory |
| 595 |
Summary of Reconciliation by Risk Category of Components of Equity and Analysis of Other Comprehensive Income Items Resulting from Hedge Accounting |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfReconciliationByRiskCategoryOfComponentsOfEquityAndAnalysisOfOtherComprehensiveIncomeItemsResultingFromHedgeAccountingExplanatory |
| 596 |
Summary of Details of Hedged Exposures by Hedging Strategies |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfDetailsOfHedgedExposuresByHedgingStrategiesExplanatory |
| 597 |
1076 - Disclosure - Other Financial Assets At Fair Value Through Profit Or Loss (Tables) |
Network |
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| 598 |
Implied Table |
Table |
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implied:Table |
| 599 |
Text block [abstract] |
Abstract |
|
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ck0001087711:TextBlockAbstract |
| 600 |
Summary of Other Financial Assets at Fair Value Through Profit or Loss |
Concept (Text Block (HTML)) |
For Period |
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ifrs-full:DisclosureOfFinancialInstrumentsDesignatedAtFairValueThroughProfitOrLossExplanatory |
| 601 |
1077 - Disclosure - Loans and Advances to Customers (Tables) |
Network |
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Implied Table |
Table |
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implied:Table |
| 603 |
Text block [abstract] |
Abstract |
|
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ck0001087711:TextBlockAbstract |
| 604 |
Summary of Net Loans and Advances to Customers |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfNetLoansAndAdvancesToCustomersExplanatory |
| 605 |
Summary of Movement in Impairment Loss Allowances |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfMovementInImpairmentLossAllowancesOnLoansAndAdvancesToCustomersExplanatory |
| 606 |
Summary of Finance Lease and Hire Purchase Contract Receivables |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfFinanceLeaseAndHirePurchaseContractReceivablesExplanatory |
| 607 |
1078 - Disclosure - Securitisations and Covered Bonds (Tables) |
Network |
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http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfSecuritisationsAndCoveredBondsExplanatoryTables |
| 608 |
Implied Table |
Table |
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implied:Table |
| 609 |
Text block [abstract] |
Abstract |
|
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ck0001087711:TextBlockAbstract |
| 610 |
Analysis of Securitisations and Covered Bonds |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfAnalysisOfSecuritisationsAndCoveredBondsExplanatory |
| 611 |
Summary of Issuances and Redemptions of Securitisation and Covered Bond Programme |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfIssuancesAndRedemptionsOfSecuritisationAndCoveredBondProgrammesExplanatory |
| 612 |
1079 - Disclosure - Transfers of Financial Assets Not Qualifying for Derecognition (Tables) |
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| 613 |
Implied Table |
Table |
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implied:Table |
| 614 |
Text block [abstract] |
Abstract |
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ck0001087711:TextBlockAbstract |
| 615 |
Carrying Amount of Financial Assets that Did Not Qualify for Derecognition and their Associated Financial Liabilities |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfCarryingAmountOfFinancialAssetsThatDidNotQualifyForDerecognitionAndTheirAssociatedFinancialLiabilitiesExplanatory |
| 616 |
1080 - Disclosure - Reverse Repurchase Agreements - Non Trading (Tables) |
Network |
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| 617 |
Statement [table] |
Table |
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ck0001087711:StatementTable |
| 618 |
Classes of financial instruments [axis] |
Axis |
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ifrs-full:ClassesOfFinancialInstrumentsAxis |
| 619 |
Financial instruments, class [member] |
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ifrs-full:ClassesOfFinancialInstrumentsMember |
| 620 |
Reverse repurchase agreements - non-trading [member] |
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ck0001087711:ReverseRepurchaseAgreementsNontradingMember |
| 621 |
Statement [LineItems] |
LineItems |
|
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ck0001087711:StatementLineItems |
| 622 |
Summary of Reverse Repurchase Agreements - Non Trading |
Concept (Text Block (HTML)) |
For Period |
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ifrs-full:DisclosureOfRepurchaseAndReverseRepurchaseAgreementsExplanatory |
| 623 |
1081 - Disclosure - Other Financial Assets At Amortised Cost (Tables) |
Network |
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http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfOtherFinancialAssetsAtAmortisedCostExplanatoryTables |
| 624 |
Implied Table |
Table |
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implied:Table |
| 625 |
Text block [abstract] |
Abstract |
|
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ck0001087711:TextBlockAbstract |
| 626 |
Summary of Other Financial Assets at Amortised Cost |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfDetailedInformationOfOtherFinancialAssetsAtAmortisedCostExplanatory |
| 627 |
1082 - Disclosure - Financial Assets At Fair Value Through Other Comprehensive Income (Tables) |
Network |
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| 628 |
Implied Table |
Table |
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implied:Table |
| 629 |
Text block [abstract] |
Abstract |
|
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ck0001087711:TextBlockAbstract |
| 630 |
Summary of Financial Assets at Fair Value Through Other Comprehensive Income |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfDetailedInformationAboutFinancialAssetsAtFairValueThroughOtherComprehensiveIncomeExplanatory |
| 631 |
1083 - Disclosure - Financial Investments (Tables) |
Network |
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| 632 |
Implied Table |
Table |
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implied:Table |
| 633 |
Text block [abstract] |
Abstract |
|
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ck0001087711:TextBlockAbstract |
| 634 |
Summary of Financial Investments |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfSummaryOfFinancialInvestmentsExplanatory |
| 635 |
1084 - Disclosure - Interests in Other Entities (Tables) |
Network |
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http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfInterestsInOtherEntitiesExplanatoryTables |
| 636 |
Implied Table |
Table |
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implied:Table |
| 637 |
Investments accounted for using equity method [abstract] |
Abstract |
|
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ifrs-full:InvestmentsAccountedForUsingEquityMethodAbstract |
| 638 |
Schedule of Interests in Other Entities |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfDetailedInformationAboutInterestsInOtherEntitiesExplanatory |
| 639 |
Schedule of Subsidiaries With Significant Non-Controlling Interests |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfSubsidiaryWithSignificantNonControllingInterestsExplanatory |
| 640 |
1085 - Disclosure - Intangible Assets (Tables) |
Network |
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http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfIntangibleAssetsAndGoodwillExplanatoryTables |
| 641 |
Implied Table |
Table |
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implied:Table |
| 642 |
Text block [abstract] |
Abstract |
|
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ck0001087711:TextBlockAbstract |
| 643 |
Schedule of Goodwill |
Concept (Text Block (HTML)) |
For Period |
|
ifrs-full:DisclosureOfGoodwillExplanatory |
| 644 |
Schedule of Goodwill for Cash Generating Units |
Concept (Text Block (HTML)) |
For Period |
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ifrs-full:DisclosureOfInformationForIndividualAssetOrCashgeneratingUnitWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesExplanatory |
| 645 |
Schedule of Other Intangibles |
Concept (Text Block (HTML)) |
For Period |
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ifrs-full:DisclosureOfIntangibleAssetsExplanatory |
| 646 |
1086 - Disclosure - Trading Liabilities (Tables) |
Network |
* |
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| 647 |
Implied Table |
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| 648 |
Text block [abstract] |
Abstract |
|
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ck0001087711:TextBlockAbstract |
| 649 |
Schedule of Trading Liabilities |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfTradingLiabilitiesExplanatory |
| 650 |
1087 - Disclosure - Other Financial Liabilities at Fair Value Through Profit or Loss (Tables) |
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Implied Table |
Table |
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| 652 |
Text block [abstract] |
Abstract |
|
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ck0001087711:TextBlockAbstract |
| 653 |
Summary of Other Financial Liabilities at Fair Value Through Profit or Loss |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfOtherFinancialLiabilitiesAtFairValueThroughProfitsOrLossExplanatory |
| 654 |
1088 - Disclosure - Deposits by Customers (Tables) |
Network |
* |
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| 655 |
Implied Table |
Table |
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| 656 |
Text block [abstract] |
Abstract |
|
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ck0001087711:TextBlockAbstract |
| 657 |
Schedule of Deposits by Customers |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfDetailedInformationAboutDepositsFromCustomersExplanatory |
| 658 |
1089 - Disclosure - Deposits by Banks (Tables) |
Network |
* |
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Implied Table |
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| 660 |
Text block [abstract] |
Abstract |
|
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ck0001087711:TextBlockAbstract |
| 661 |
Schedule of Deposits by Banks |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfDepositsByBankExplanatory |
| 662 |
1090 - Disclosure - Repurchase Agreements - Non Trading (Tables) |
Network |
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Implied Table |
Table |
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Text block [abstract] |
Abstract |
|
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ck0001087711:TextBlockAbstract |
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Summary of Repurchase Agreements - Non Trading |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DetailedDisclosureOfRepurchaseAgreementsNontradingExplanatory |
| 666 |
1091 - Disclosure - Debt Securities in Issue (Tables) |
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Implied Table |
Table |
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| 668 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 669 |
Summary of Debt Securities in Issue |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfDebtSecuritiesInIssueExplanatory |
| 670 |
1092 - Disclosure - Subordinated Liabilities (Tables) |
Network |
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Implied Table |
Table |
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| 672 |
Text block [abstract] |
Abstract |
|
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ck0001087711:TextBlockAbstract |
| 673 |
Schedule of Subordinated Liabilities |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfDetailsOfSubordinatedLiabilitiesExplanatory |
| 674 |
Summary of Undated Subordinated Liabilities |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfUndatedSubordinatedLiabilitiesExplanatory |
| 675 |
Summary of Dated Subordinated Liabilities |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfDatedSubordinatedLiabilitiesExplanatory |
| 676 |
1093 - Disclosure - Provisions (Tables) |
Network |
* |
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| 677 |
Implied Table |
Table |
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| 678 |
Text block [abstract] |
Abstract |
|
|
ck0001087711:TextBlockAbstract |
| 679 |
Summary of Provisions Reconciliation |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfProvisionsReconciliationByClassExplanatory |
| 680 |
Summary of Key Drivers of PPI Provision Balance and Forecast Assumptions Used in Calculating Provision |
Concept (Text Block (HTML)) |
For Period |
|
ck0001087711:DisclosureOfKeyDriversOfPPIProvisionBalanceAndForecastAssumptionsUsedInCalculatingProvisionExplanatory |
| 681 |
1094 - Disclosure - Retirement Benefit Plans (Tables) |
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Implied Table |
Table |
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Text block [abstract] |
Abstract |
|
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ck0001087711:TextBlockAbstract |
| 684 |
Summary of Retirement Benefit Plans |
Concept (Text Block (HTML)) |
For Period |
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ifrs-full:DisclosureOfDefinedBenefitPlansExplanatory |
| 685 |
Summary of Pension Remeasurement (Gains)/Losses Recognised In Other Comprehensive Income |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfPensionRemeasurementsIncludedInOtherComprehensiveIncomeExplanatory |
| 686 |
Total defined benefit plan amount charged to the income statement |
Concept (Text Block (HTML)) |
For Period |
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| 687 |
Summary of Amounts Recognised in Other Comprehensive Income |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfAmountsRecognisedInOtherComprehensiveIncomeExplanatory |
| 688 |
Disclosure of Movements in Present Value of Defined Benefit Obligations |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfMovementsInThePresentValueOfDefinedBenefitObligationsExplanatory |
| 689 |
Disclosure of Movements in Fair Value of Schemes' Assets |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfMovementsInFairValueOfSchemesAssetsExplanatory |
| 690 |
Summary of Composition and Fair Value of Plan Assets |
Concept (Text Block (HTML)) |
For Period |
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ifrs-full:DisclosureOfFairValueOfPlanAssetsExplanatory |
| 691 |
Summary of Principal Actuarial Assumptions Used for Defined Benefit Schemes |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfDefinedBenefitPlanActuarialAssumptionsExplanatory |
| 692 |
Summary of Actuarial Assumption Sensitivities |
Concept (Text Block (HTML)) |
For Period |
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ifrs-full:DisclosureOfSensitivityAnalysisForActuarialAssumptionsExplanatory |
| 693 |
Disclosure of Benefits Expected To Be Paid |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfDefinedBenefitPlanExpectedFutureBenefitPaymentsExplanatory |
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1095 - Disclosure - Contingent Liabilities And Commitments (Tables) |
Network |
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Implied Table |
Table |
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Text block [abstract] |
Abstract |
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ck0001087711:TextBlockAbstract |
| 697 |
Summary of Contingent Liabilities and Commitments |
Concept (Text Block (HTML)) |
For Period |
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| 698 |
Operating Lease Commitments |
Concept (Text Block (HTML)) |
For Period |
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ifrs-full:DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsExplanatory |
| 699 |
1096 - Disclosure - Share Capital (Tables) |
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Implied Table |
Table |
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Text block [abstract] |
Abstract |
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ck0001087711:TextBlockAbstract |
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Schedule of Share Capital Issued and Fully Paid |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfIssuedAndFullyPaidShareCapitalExplanatory |
| 703 |
Summary of Share Premium |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfSharePremiumExplanatory |
| 704 |
1097 - Disclosure - Other Equity Instruments (Tables) |
Network |
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Implied Table |
Table |
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| 706 |
Text block [abstract] |
Abstract |
|
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ck0001087711:TextBlockAbstract |
| 707 |
Summary of other equity instruments |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfSummaryOfOtherEquityInstrumentsExplanatory |
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1098 - Disclosure - Non-Controlling Interests (Tables) |
Network |
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Implied Table |
Table |
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| 710 |
Text block [abstract] |
Abstract |
|
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ck0001087711:TextBlockAbstract |
| 711 |
Schedule of Amounts Attributable to Non-Controlling Interests |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:ScheduleOfInformationAboutAmountsAttributableToNonControllingInterestsExplanatory |
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1099 - Disclosure - Changes in Liabilities Arising from Financing Activities (Tables) |
Network |
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Implied Table |
Table |
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| 714 |
Text block [abstract] |
Abstract |
|
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ck0001087711:TextBlockAbstract |
| 715 |
Summary of Changes in Liabilities Arising from Financing Activities |
Concept (Text Block (HTML)) |
For Period |
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ifrs-full:DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesExplanatory |
| 716 |
1100 - Disclosure - Assets Charged As Security For Liabilities And Collateral Accepted As Security For Assets (Tables) |
Network |
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Implied Table |
Table |
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| 718 |
Text block [abstract] |
Abstract |
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ck0001087711:TextBlockAbstract |
| 719 |
Financial Assets Charged as Security Under On-Balance Sheet and Off-Balance |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:ScheduleOfFinancialAssetsChargedAsSecurityForLiabilitiesExplanatory |
| 720 |
Schedule of Collateral Held as Security For Assets |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfCollateralAcceptedAsSecurityForAssetsExplanatory |
| 721 |
1101 - Disclosure - Share-Based Compensation (Tables) |
Network |
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Statement [table] |
Table |
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2015 LTIP [member] |
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| 726 |
Statement [LineItems] |
LineItems |
|
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ck0001087711:StatementLineItems |
| 727 |
Summary of Movement in Share Options |
Concept (Text Block (HTML)) |
For Period |
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ifrs-full:DisclosureOfNumberAndWeightedAverageExercisePricesOfShareOptionsExplanatory |
| 728 |
Summary of Range of Exercise Prices and Weighted Average Remaining Contractual Life of the Options Outstanding |
Concept (Text Block (HTML)) |
For Period |
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Summary of Movement in Value of Conditional Awards in LTIPs |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfMovementInValueOfConditionalAwardsExplanatory |
| 730 |
1102 - Disclosure - Transactions With Directors and Other Key Management Personnel (Tables) |
Network |
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Implied Table |
Table |
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Text block [abstract] |
Abstract |
|
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ck0001087711:TextBlockAbstract |
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Summary of Remuneration of the Directors and Other Key Management Personnel |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfRemunerationOfDirectorsAndOtherKeyManagementPersonnelExplanatory |
| 734 |
Summary of Transactions with Directors, Other Key Management Personnel |
Concept (Text Block (HTML)) |
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ck0001087711:DisclosureOfTransactionsWithDirectorsKeyManagementPersonnelAndTheirConnectedPersonsExplanatory |
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1103 - Disclosure - Related Party Disclosures (Tables) |
Network |
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| 736 |
Implied Table |
Table |
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| 737 |
Text block [abstract] |
Abstract |
|
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ck0001087711:TextBlockAbstract |
| 738 |
Summary of Transactions With Related Parties |
Concept (Text Block (HTML)) |
For Period |
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ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesExplanatory |
| 739 |
1104 - Disclosure - Financial Instruments (Tables) |
Network |
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| 740 |
Implied Table |
Table |
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Text block [abstract] |
Abstract |
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ck0001087711:TextBlockAbstract |
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Fair Values of Financial Instruments Carried at Amortised Cost |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfFairValueOfFinancialInstrumentsAtAmortisedCostExplanatory |
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Fair Values of Financial Instruments Measured at Fair Value on a Recurring Basis |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfFairValueOfFinancialInstrumentsAtFairValueExplanatory |
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Summary of Fair Value Adjustment |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:ScheduleOfFairValueAdjustmentExplanatory |
| 745 |
Analysis of Financial Instruments Valued Using Internal Models Based on Information Other Than Market Data |
Concept (Text Block (HTML)) |
For Period |
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Reconciliation of Fair Value Measurements in Level 3 of the Fair Value Hierarchy |
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For Period |
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Effects of Changes in Significant Unobservable Assumptions to Reasonably Possible Alternatives (Level 3) |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:EffectsOfChangesInSignificantUnobservableAssumptionsToReasonablyPossibleAlternativesLevelThreeExplanatory |
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Maturities of Undiscounted Cash Flows for Financial Liabilities and Off Balance Sheet Commitments |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:MaturitiesOfUndiscountedCashFlowsForFinancialLiabilitiesAndOffBalanceSheetCommitmentsExplanatory |
| 749 |
1105 - Disclosure - Offsetting Financial Assets and Liabilities (Tables) |
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Implied Table |
Table |
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implied:Table |
| 751 |
Text block [abstract] |
Abstract |
|
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ck0001087711:TextBlockAbstract |
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Summary of Information about Impact of Offsetting of Financial Assets and Liabilities |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfOffsettingFinancialAssetsAndLiabilitiesExplanatory |
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1106 - Disclosure - Transition to IFRS 9 (Tables) |
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Statement [table] |
Table |
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ck0001087711:StatementTable |
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IFRS 9 [member] |
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Statement [LineItems] |
LineItems |
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ck0001087711:StatementLineItems |
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Summary of Measurement Categories and Carrying Amounts of Financial Assets Determined in Accordance with IAS 39 and IFRS 9 |
Concept (Text Block (HTML)) |
For Period |
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ck0001087711:DisclosureOfMeasurementCategoriesAndCarryingAmountsOfFinancialAssetsExplanatory |
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Disclosure of Statutory Balance Sheet Reconciliation under IAS 39 and IFRS 9 |
Concept (Text Block (HTML)) |
For Period |
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ifrs-full:DisclosureOfFinancialAssetsExplanatory |
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1107 - Disclosure - Credit Risk - Summary of Exposures to Credit Risk in Business Segments (Detail) |
Network |
* |
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Disclosure of credit risk exposure [table] |
Table |
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Segments [axis] |
Axis |
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Segments [member] |
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Retail banking [member] |
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| 766 |
Corporate and commercial banking [member] |
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Corporate and investment banking [member] |
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ck0001087711:CorporateAndInvestmentBankingMember |
| 768 |
Corporate centre [member] |
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ck0001087711:CorporateCentreMember |
| 769 |
Types of risks [axis] |
Axis |
|
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ifrs-full:TypesOfRisksAxis |
| 770 |
Risks [member] |
Member |
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ifrs-full:TypesOfRisksMember |
| 771 |
Credit risk [member] |
Member |
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ifrs-full:CreditRiskMember |
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LineItems |
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ifrs-full:DisclosureOfCreditRiskExposureLineItems |
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Description of exposure to risk in business segments |
Concept (Text/String) |
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ifrs-full:DescriptionOfExposureToRisk |
| 774 |
1108 - Disclosure - Credit Risk - Summary of Key Metrics to Measure and Control Credit Risk (Detail) |
Network |
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Disclosure of credit risk exposure [table] |
Table |
* |
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ifrs-full:DisclosureOfCreditRiskExposureTable |
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Axis |
|
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ifrs-full:MethodOfAssessmentOfExpectedCreditLossesAxis |
| 777 |
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Non performing loans [member] |
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ck0001087711:NonPerformingLoansMember |
| 779 |
Expected Loss [member] |
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ck0001087711:ExpectedLossMember |
| 780 |
Expected credit losses [member] |
Member |
|
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ck0001087711:ExpectedCreditLossesMember |
| 781 |
Stages 1, 2 and 3 [member] |
Member |
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ck0001087711:Stages12And3Member |
| 782 |
Types of risks [axis] |
Axis |
|
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ifrs-full:TypesOfRisksAxis |
| 783 |
Risks [member] |
Member |
|
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ifrs-full:TypesOfRisksMember |
| 784 |
Credit risk [member] |
Member |
|
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ifrs-full:CreditRiskMember |
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Disclosure of credit risk exposure [line items] |
LineItems |
|
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ifrs-full:DisclosureOfCreditRiskExposureLineItems |
| 786 |
Metric |
Concept (Text/String) |
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ifrs-full:MethodsUsedToMeasureRisk |
| 787 |
Description |
Concept (Text/String) |
For Period |
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ifrs-full:DescriptionOfObjectivesPoliciesAndProcessesForManagingRisk |
| 788 |
1109 - Disclosure - Credit Risk - Summary of Compound Annual Growth Rates Over 5 Year Forecast (Detail) |
Network |
* |
* |
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| 789 |
Disclosure of compound annual growth rates forecast [table] |
Table |
* |
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ck0001087711:DisclosureOfCompoundAnnualGrowthRatesForecastTable |
| 790 |
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Axis |
|
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ifrs-full:TypeOfMeasurementOfExpectedCreditLossesAxis |
| 791 |
Type of measurement of expected credit losses [member] |
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ifrs-full:TypeOfMeasurementOfExpectedCreditLossesMember |
| 792 |
Upside 2 [member] |
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ck0001087711:UpsideTwoScenarioMember |
| 793 |
Upside 1 [member] |
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| 794 |
Base case [member] |
Member |
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ck0001087711:BaseCaseScenarioMember |
| 795 |
Downside 1 [member] |
Member |
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ck0001087711:DownsideOneScenarioMember |
| 796 |
Downside 2 [member] |
Member |
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ck0001087711:DownsideTwoScenarioMember |
| 797 |
Disclosure of forward looking information used in the determination of expected credit losses [line items] |
LineItems |
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ck0001087711:DisclosureOfForwardLookingInformationUsedInTheDeterminationOfExpectedCreditLossesLineItems |
| 798 |
House price index |
Concept (Percent) |
For Period |
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ck0001087711:HousePriceIndexRate |
| 799 |
GDP |
Concept (Percent) |
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ck0001087711:GrossDomesticProductRate |
| 800 |
Unemployment rate |
Concept (Percent) |
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ck0001087711:UnemploymentRate |
| 801 |
Interest rate |
Concept (Percent) |
For Period |
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ck0001087711:InterestRate |
| 802 |
1110 - Disclosure - Credit Risk - Summary of Probability Weightings Applied to Scenarios (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfProbabilityWeightingsAppliedToScenarios |
| 803 |
Disclosure of probability weightings of scenarios [table] |
Table |
* |
* |
ck0001087711:DisclosureOfProbabilityWeightingsOfScenariosTable |
| 804 |
Type of measurement of expected credit losses [axis] |
Axis |
|
|
ifrs-full:TypeOfMeasurementOfExpectedCreditLossesAxis |
| 805 |
Type of measurement of expected credit losses [member] |
Member |
|
|
ifrs-full:TypeOfMeasurementOfExpectedCreditLossesMember |
| 806 |
Upside 2 [member] |
Member |
|
|
ck0001087711:UpsideTwoScenarioMember |
| 807 |
Upside 1 [member] |
Member |
|
|
ck0001087711:UpsideOneScenarioMember |
| 808 |
Base case [member] |
Member |
|
|
ck0001087711:BaseCaseScenarioMember |
| 809 |
Downside 1 [member] |
Member |
|
|
ck0001087711:DownsideOneScenarioMember |
| 810 |
Downside 2 [member] |
Member |
|
|
ck0001087711:DownsideTwoScenarioMember |
| 811 |
Disclosure of probability weightings of scenarios [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfProbabilityWeightingsOfScenariosLineItems |
| 812 |
Probability % |
Concept (Percent) |
For Period |
|
ck0001087711:ProbabilityWeightingsOfScenarios |
| 813 |
1111 - Disclosure - Credit Risk - Summary of Annual Growth Rates over 4 Year Forecast for CIB portfolio (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfAnnualGrowthRatesOver4YearForecastForCIBPortfolio |
| 814 |
Disclosure of compound annual growth rates forecast [table] |
Table |
* |
* |
ck0001087711:DisclosureOfCompoundAnnualGrowthRatesForecastTable |
| 815 |
Type of measurement of expected credit losses [axis] |
Axis |
|
|
ifrs-full:TypeOfMeasurementOfExpectedCreditLossesAxis |
| 816 |
Type of measurement of expected credit losses [member] |
Member |
|
|
ifrs-full:TypeOfMeasurementOfExpectedCreditLossesMember |
| 817 |
Upside Scenario [member] |
Member |
|
|
ck0001087711:UpsideScenarioMember |
| 818 |
Base case [member] |
Member |
|
|
ck0001087711:BaseCaseScenarioMember |
| 819 |
Downside Scenario [member] |
Member |
|
|
ck0001087711:DownsideScenarioMember |
| 820 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 821 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 822 |
Corporate and investment banking [member] |
Member |
|
|
ck0001087711:CorporateAndInvestmentBankingMember |
| 823 |
Disclosure of forward looking information used in the determination of expected credit losses [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfForwardLookingInformationUsedInTheDeterminationOfExpectedCreditLossesLineItems |
| 824 |
GDP |
Concept (Percent) |
For Period |
|
ck0001087711:GrossDomesticProductRate |
| 825 |
1112 - Disclosure - Credit Risk - Summary of Probability Weightings Applied to Scenarios for CIB Portfolio (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfProbabilityWeightingsAppliedToScenariosForCIBPortfolio |
| 826 |
Disclosure of probability weightings of scenarios [table] |
Table |
* |
* |
ck0001087711:DisclosureOfProbabilityWeightingsOfScenariosTable |
| 827 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 828 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 829 |
Corporate and investment banking [member] |
Member |
|
|
ck0001087711:CorporateAndInvestmentBankingMember |
| 830 |
Type of measurement of expected credit losses [axis] |
Axis |
|
|
ifrs-full:TypeOfMeasurementOfExpectedCreditLossesAxis |
| 831 |
Type of measurement of expected credit losses [member] |
Member |
|
|
ifrs-full:TypeOfMeasurementOfExpectedCreditLossesMember |
| 832 |
Upside Scenario [member] |
Member |
|
|
ck0001087711:UpsideScenarioMember |
| 833 |
Base case [member] |
Member |
|
|
ck0001087711:BaseCaseScenarioMember |
| 834 |
Downside Scenario [member] |
Member |
|
|
ck0001087711:DownsideScenarioMember |
| 835 |
Disclosure of probability weightings of scenarios [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfProbabilityWeightingsOfScenariosLineItems |
| 836 |
Probability % |
Concept (Percent) |
For Period |
|
ck0001087711:ProbabilityWeightingsOfScenarios |
| 837 |
1113 - Disclosure - Credit Risk - Disclosure of Quantitative Criteria of Credit Risk Exposure (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskDisclosureOfQuantitativeCriteriaOfCreditRiskExposure |
| 838 |
Disclosure of credit risk exposure [table] |
Table |
* |
* |
ifrs-full:DisclosureOfCreditRiskExposureTable |
| 839 |
Products and services [axis] |
Axis |
|
|
ifrs-full:ProductsAndServicesAxis |
| 840 |
Products and services [member] |
Member |
|
|
ifrs-full:ProductsAndServicesMember |
| 841 |
Mortgages [member] |
Member |
|
|
ifrs-full:MortgagesMember |
| 842 |
Consumer (auto) finance [member] |
Member |
|
|
ifrs-full:ConsumerLoansMember |
| 843 |
Personal loans [member] |
Member |
|
|
ck0001087711:PersonalLoansMember |
| 844 |
Credit cards [member] |
Member |
|
|
ck0001087711:CreditCardsMember |
| 845 |
Overdrafts [member] |
Member |
|
|
ck0001087711:OverdraftsMember |
| 846 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 847 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 848 |
Retail banking [member] |
Member |
|
|
ck0001087711:RetailBankingMember |
| 849 |
Corporate and commercial banking [member] |
Member |
|
|
ck0001087711:CorporateAndCommercialBankingMember |
| 850 |
Corporate and investment banking [member] |
Member |
|
|
ck0001087711:CorporateAndInvestmentBankingMember |
| 851 |
Probability of default [axis] |
Axis |
|
|
ifrs-full:ProbabilityOfDefaultAxis |
| 852 |
Entity's total for probability of default [member] |
Member |
|
|
ifrs-full:EntitysTotalForProbabilityOfDefaultMember |
| 853 |
Probability of default [member] |
Member |
|
|
ifrs-full:ProbabilityOfDefaultMember |
| 854 |
Disclosure of credit risk exposure [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfCreditRiskExposureLineItems |
| 855 |
Other unsecured loans |
Concept (Percent) |
For Period |
|
ck0001087711:PDThresholdForMeasuringSignificantIncreaseInCreditRisk |
| 856 |
Corporate & Investment Banking |
Concept (Text/String) |
For Period |
|
ck0001087711:CriteriaMeasuringSignificantIncreaseInCreditRisk |
| 857 |
1114 - Disclosure - Credit Risk - Disclosure of Qualitative Criteria of Credit Risk Exposure (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskDisclosureOfQualitativeCriteriaOfCreditRiskExposure |
| 858 |
Disclosure of credit risk exposure [table] |
Table |
* |
* |
ifrs-full:DisclosureOfCreditRiskExposureTable |
| 859 |
Products and services [axis] |
Axis |
|
|
ifrs-full:ProductsAndServicesAxis |
| 860 |
Products and services [member] |
Member |
|
|
ifrs-full:ProductsAndServicesMember |
| 861 |
Mortgages [member] |
Member |
|
|
ifrs-full:MortgagesMember |
| 862 |
Consumer (auto) finance [member] |
Member |
|
|
ifrs-full:ConsumerLoansMember |
| 863 |
Personal loans [member] |
Member |
|
|
ck0001087711:PersonalLoansMember |
| 864 |
Credit cards [member] |
Member |
|
|
ck0001087711:CreditCardsMember |
| 865 |
Overdrafts [member] |
Member |
|
|
ck0001087711:OverdraftsMember |
| 866 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 867 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 868 |
Retail banking [member] |
Member |
|
|
ck0001087711:RetailBankingMember |
| 869 |
Corporate and investment banking [member] |
Member |
|
|
ck0001087711:CorporateAndInvestmentBankingMember |
| 870 |
Disclosure of credit risk exposure [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfCreditRiskExposureLineItems |
| 871 |
Qualitative Criteria For Measuring SICR |
Concept (Text/String) |
For Period |
|
ck0001087711:QualitativeCriteriaForMeasuringSignificantIncreaseInCreditRisk |
| 872 |
1115 - Disclosure - Credit Risk - Summary of Difference Between Maximum and Net Exposure to Credit Risk - IFRS 9 (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfDifferenceBetweenMaximumAndNetExposureToCreditRiskIFRS9 |
| 873 |
Disclosure of credit risk exposure [table] |
Table |
* |
* |
ifrs-full:DisclosureOfCreditRiskExposureTable |
| 874 |
Classes of assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfAssetsAxis |
| 875 |
Assets [member] |
Member |
|
|
ifrs-full:ClassesOfAssetsMember |
| 876 |
Financial assets at amortised cost [member] |
Member |
|
|
ifrs-full:FinancialAssetsAtAmortisedCostMember |
| 877 |
Loans and Advances to Customers [member] |
Member |
|
|
ck0001087711:LoansAndAdvancesToCustomersMember |
| 878 |
Debt Securities [member] |
Member |
|
|
ifrs-full:DebtSecuritiesMember |
| 879 |
Assets and liabilities [axis] |
Axis |
|
|
ifrs-full:AssetsAndLiabilitiesAxis |
| 880 |
Assets and liabilities [member] |
Member |
|
|
ifrs-full:AssetsAndLiabilitiesMember |
| 881 |
Off-Balance Sheet [member] |
Member |
|
|
ck0001087711:OffBalanceSheetMember |
| 882 |
Types of risks [axis] |
Axis |
|
|
ifrs-full:TypesOfRisksAxis |
| 883 |
Risks [member] |
Member |
|
|
ifrs-full:TypesOfRisksMember |
| 884 |
Credit risk [member] |
Member |
|
|
ifrs-full:CreditRiskMember |
| 885 |
Classes of financial assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialAssetsAxis |
| 886 |
Financial assets, class [member] |
Member |
|
|
ifrs-full:FinancialAssetsMember |
| 887 |
Cash and balances at central banks [member] |
Member |
|
|
ck0001087711:CashAndBalancesAtCentralBanksMember |
| 888 |
Loans and Advances to Customers [member] |
Member |
|
|
ck0001087711:LoansAndAdvancesToCustomersMember |
| 889 |
Loans and advances to banks [member] |
Member |
|
|
ck0001087711:LoansAndAdvancesToBanksMember |
| 890 |
Reverse repurchase agreements - non-trading [member] |
Member |
|
|
ck0001087711:ReverseRepurchaseAgreementsNontradingMember |
| 891 |
Other financial assets at amortised cost [member] |
Member |
|
|
ck0001087711:OtherFinancialAssetsAtAmortisedCostMember |
| 892 |
Financial assets at FVOCI [member] |
Member |
|
|
ck0001087711:FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeMember |
| 893 |
Financial investments [member] |
Member |
|
|
ck0001087711:FinancialInvestmentsMember |
| 894 |
Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] |
Axis |
|
|
ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis |
| 895 |
Carrying amount [member] |
Member |
|
|
ifrs-full:CarryingAmountMember |
| 896 |
Cost [member] |
Member |
|
|
ifrs-full:GrossCarryingAmountMember |
| 897 |
Accumulated Impairment [member] |
Member |
|
|
ifrs-full:AccumulatedImpairmentMember |
| 898 |
Categories of financial assets [axis] |
Axis |
|
|
ifrs-full:CategoriesOfFinancialAssetsAxis |
| 899 |
Financial assets, category [member] |
Member |
|
|
ifrs-full:FinancialAssetsCategoryMember |
| 900 |
Advances secured on residential property [member] |
Member |
|
|
ck0001087711:AdvancesSecuredOnResidentialPropertyMember |
| 901 |
Corporate loans [member] |
Member |
|
|
ifrs-full:CorporateLoansMember |
| 902 |
Finance leases [member] |
Member |
|
|
ifrs-full:LeaseReceivablesMember |
| 903 |
Other unsecured advances [member] |
Member |
|
|
ck0001087711:OtherUnsecuredLoansMember |
| 904 |
Amounts due from fellow banco santander group subsidiaries and joint ventures [member] |
Member |
|
|
ck0001087711:AmountsDueFromSubsidiariesAndJointVenturesMember |
| 905 |
Loans and receivables securities [member] |
Member |
|
|
ifrs-full:LoansAndReceivablesCategoryMember |
| 906 |
Available-for-sale [member] |
Member |
|
|
ifrs-full:FinancialAssetsAvailableforsaleCategoryMember |
| 907 |
Held-to-maturity debt securities [member] |
Member |
|
|
ifrs-full:HeldtomaturityInvestmentsCategoryMember |
| 908 |
Disclosure of credit risk exposure [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfCreditRiskExposureLineItems |
| 909 |
Maximum exposure to balance sheet |
Concept (Monetary) |
As Of |
|
ifrs-full:MaximumExposureToCreditRisk |
| 910 |
Collateral cash |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:CashCollateralPledgedSubjectToEnforceableMasterNettingArrangementOrSimilarAgreementNotSetOffAgainstFinancialLiabilities |
| 911 |
Collateral non-cash |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:NoncashAssetsPledgedAsCollateralForWhichTransfereeHasRightByContractOrCustomToSellOrRepledgeCollateral |
| 912 |
Netting |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialInstrumentsSubjectToEnforceableMasterNettingArrangementOrSimilarAgreementNotSetOffAgainstFinancialLiabilities |
| 913 |
Net exposure |
Concept (Monetary) |
As Of |
|
ifrs-full:CreditExposure |
| 914 |
1116 - Disclosure - Credit Risk - Summary of Difference Between Maximum and Net Exposure to Credit Risk (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfDifferenceBetweenMaximumAndNetExposureToCreditRisk |
| 915 |
Disclosure of credit risk exposure [table] |
Table |
* |
* |
ifrs-full:DisclosureOfCreditRiskExposureTable |
| 916 |
Classes of assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfAssetsAxis |
| 917 |
Assets [member] |
Member |
|
|
ifrs-full:ClassesOfAssetsMember |
| 918 |
Securities Repurchased Under Resale Agreements [member] |
Member |
|
|
ck0001087711:SecuritiesRepurchasedUnderResaleAgreementsMember |
| 919 |
Debt Securities [member] |
Member |
|
|
ifrs-full:DebtSecuritiesMember |
| 920 |
Cash Collateral [member] |
Member |
|
|
ck0001087711:CashCollateralMember |
| 921 |
Short-term loans [member] |
Member |
|
|
ck0001087711:ShortTermLoansMember |
| 922 |
Loans and Advances to Customers [member] |
Member |
|
|
ck0001087711:LoansAndAdvancesToCustomersMember |
| 923 |
Classes of financial assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialAssetsAxis |
| 924 |
Financial assets, class [member] |
Member |
|
|
ifrs-full:FinancialAssetsMember |
| 925 |
Trading Assets [member] |
Member |
|
|
ck0001087711:FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTradingMember |
| 926 |
Derivative Financial Instruments [member] |
Member |
|
|
ck0001087711:DerivativeFinancialAssetsMember |
| 927 |
Other financial assets at fair value through profit loss [member] |
Member |
|
|
ck0001087711:OtherFinancialAssetsAtFairValueThroughProfitLossMember |
| 928 |
Financial assets at fair value through profit loss [member] |
Member |
|
|
ck0001087711:FinancialAssetsAtFairValueThroughProfitLossMember |
| 929 |
Financial Assets Designated at Fair Value [member] |
Member |
|
|
ck0001087711:FinancialAssetsAtFairValueThroughProfitOrLossDesignatedAsUponInitialRecognitionMember |
| 930 |
Types of risks [axis] |
Axis |
|
|
ifrs-full:TypesOfRisksAxis |
| 931 |
Risks [member] |
Member |
|
|
ifrs-full:TypesOfRisksMember |
| 932 |
Credit risk [member] |
Member |
|
|
ifrs-full:CreditRiskMember |
| 933 |
Disclosure of credit risk exposure [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfCreditRiskExposureLineItems |
| 934 |
Maximum exposure to balance sheet |
Concept (Monetary) |
As Of |
|
ifrs-full:MaximumExposureToCreditRisk |
| 935 |
Collateral cash |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:CashCollateralPledgedSubjectToEnforceableMasterNettingArrangementOrSimilarAgreementNotSetOffAgainstFinancialLiabilities |
| 936 |
Collateral non-cash |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:NoncashAssetsPledgedAsCollateralForWhichTransfereeHasRightByContractOrCustomToSellOrRepledgeCollateral |
| 937 |
Netting |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialInstrumentsSubjectToEnforceableMasterNettingArrangementOrSimilarAgreementNotSetOffAgainstFinancialLiabilities |
| 938 |
Net exposure |
Concept (Monetary) |
As Of |
|
ifrs-full:CreditExposure |
| 939 |
1117 - Disclosure - Credit Risk - Summary of Credit Rating of Financial Assets Subject to Credit Risk (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfCreditRatingOfFinancialAssetsSubjectToCreditRisk |
| 940 |
Disclosure of internal credit grades [table] |
Table |
* |
* |
ifrs-full:DisclosureOfInternalCreditExposuresTable |
| 941 |
Categories of financial assets [axis] |
Axis |
|
|
ifrs-full:CategoriesOfFinancialAssetsAxis |
| 942 |
Financial assets, category [member] |
Member |
|
|
ifrs-full:FinancialAssetsCategoryMember |
| 943 |
Stage 1 [member] |
Member |
|
|
ck0001087711:StageOneMember |
| 944 |
Stage 2 [member] |
Member |
|
|
ck0001087711:StageTwoMember |
| 945 |
Stage 3 [member] |
Member |
|
|
ck0001087711:StageThreeMember |
| 946 |
Loans and receivables securities [member] |
Member |
|
|
ifrs-full:LoansAndReceivablesCategoryMember |
| 947 |
Available-for-sale [member] |
Member |
|
|
ifrs-full:FinancialAssetsAvailableforsaleCategoryMember |
| 948 |
Held-to-maturity debt securities [member] |
Member |
|
|
ifrs-full:HeldtomaturityInvestmentsCategoryMember |
| 949 |
Assets and liabilities [axis] |
Axis |
|
|
ifrs-full:AssetsAndLiabilitiesAxis |
| 950 |
Assets and liabilities [member] |
Member |
|
|
ifrs-full:AssetsAndLiabilitiesMember |
| 951 |
Balance sheet exposures [member] |
Member |
|
|
ck0001087711:BalanceSheetExposuresMember |
| 952 |
Off-Balance Sheet [member] |
Member |
|
|
ck0001087711:OffBalanceSheetMember |
| 953 |
Advances secured on residential property [member] |
Member |
|
|
ck0001087711:AdvancesSecuredOnResidentialPropertyMember |
| 954 |
Corporate loans [member] |
Member |
|
|
ifrs-full:CorporateLoansMember |
| 955 |
Finance leases [member] |
Member |
|
|
ifrs-full:LeaseReceivablesMember |
| 956 |
Other unsecured advances [member] |
Member |
|
|
ck0001087711:OtherUnsecuredLoansMember |
| 957 |
Amounts due from fellow banco santander group subsidiaries and joint ventures [member] |
Member |
|
|
ck0001087711:AmountsDueFromSubsidiariesAndJointVenturesMember |
| 958 |
Internal credit grades [axis] |
Axis |
|
|
ifrs-full:InternalCreditGradesAxis |
| 959 |
Entity's total for internal credit grades [member] |
Member |
|
|
ifrs-full:EntitysTotalForInternalCreditGradesMember |
| 960 |
Internal grade 9 [member] |
Member |
|
|
ck0001087711:InternalGradeNineMember |
| 961 |
Internal grade 8 [member] |
Member |
|
|
ck0001087711:InternalGradeEightMember |
| 962 |
Internal grade 7 [member] |
Member |
|
|
ck0001087711:InternalGradeSevenMember |
| 963 |
Internal grade 6 [member] |
Member |
|
|
ck0001087711:InternalGradeSixMember |
| 964 |
Internal grade 5 [member] |
Member |
|
|
ck0001087711:InternalGradeFiveMember |
| 965 |
Internal grade 4 [member] |
Member |
|
|
ck0001087711:InternalGradeFourMember |
| 966 |
Internal grade 3 to 1 [member] |
Member |
|
|
ck0001087711:InternalGradeThreeToOneMember |
| 967 |
Other [member] |
Member |
|
|
ck0001087711:OtherInternalGradeMember |
| 968 |
Classes of financial assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialAssetsAxis |
| 969 |
Financial assets, class [member] |
Member |
|
|
ifrs-full:FinancialAssetsMember |
| 970 |
Cash and balances at central banks [member] |
Member |
|
|
ck0001087711:CashAndBalancesAtCentralBanksMember |
| 971 |
Loans and Advances to Customers [member] |
Member |
|
|
ck0001087711:LoansAndAdvancesToCustomersMember |
| 972 |
Loans and advances to banks [member] |
Member |
|
|
ck0001087711:LoansAndAdvancesToBanksCategoryMember |
| 973 |
Reverse repurchase agreements - non-trading [member] |
Member |
|
|
ck0001087711:ReverseRepurchaseAgreementsNontradingMember |
| 974 |
Other financial assets at amortised cost [member] |
Member |
|
|
ck0001087711:OtherFinancialAssetsAtAmortisedCostMember |
| 975 |
Financial assets at fair value through other comprehensive income [member] |
Member |
|
|
ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember |
| 976 |
Financial investments [member] |
Member |
|
|
ck0001087711:FinancialInvestmentsMember |
| 977 |
Classes of assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfAssetsAxis |
| 978 |
Assets [member] |
Member |
|
|
ifrs-full:ClassesOfAssetsMember |
| 979 |
Financial assets at amortised cost [member] |
Member |
|
|
ifrs-full:FinancialAssetsAtAmortisedCostMember |
| 980 |
Types of risks [axis] |
Axis |
|
|
ifrs-full:TypesOfRisksAxis |
| 981 |
Risks [member] |
Member |
|
|
ifrs-full:TypesOfRisksMember |
| 982 |
Credit risk [member] |
Member |
|
|
ifrs-full:CreditRiskMember |
| 983 |
Disclosure of internal credit grades [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfInternalCreditExposuresLineItems |
| 984 |
Loss allowance |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:AllowanceAccountForCreditLossesOfFinancialAssets |
| 985 |
Financial assets |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssets |
| 986 |
1118 - Disclosure - Credit Risk - Summary of Credit Performance (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfCreditPerformance |
| 987 |
Disclosure of credit risk exposure [table] |
Table |
* |
* |
ifrs-full:DisclosureOfCreditRiskExposureTable |
| 988 |
Products and services [axis] |
Axis |
|
|
ifrs-full:ProductsAndServicesAxis |
| 989 |
Products and services [member] |
Member |
|
|
ifrs-full:ProductsAndServicesMember |
| 990 |
Mortgages [member] |
Member |
|
|
ifrs-full:MortgagesMember |
| 991 |
Corporate loans [member] |
Member |
|
|
ifrs-full:CorporateLoansMember |
| 992 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 993 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 994 |
Retail banking [member] |
Member |
|
|
ck0001087711:RetailBankingMember |
| 995 |
Corporate and commercial banking [member] |
Member |
|
|
ck0001087711:CorporateAndCommercialBankingMember |
| 996 |
Corporate and investment banking [member] |
Member |
|
|
ck0001087711:CorporateAndInvestmentBankingMember |
| 997 |
Corporate centre [member] |
Member |
|
|
ck0001087711:CorporateCentreMember |
| 998 |
Classes of assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfAssetsAxis |
| 999 |
Assets [member] |
Member |
|
|
ifrs-full:ClassesOfAssetsMember |
| 1000 |
Loans to Customers [member] |
Member |
|
|
ck0001087711:LoansToCustomersMember |
| 1001 |
Disclosure of credit risk exposure [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfCreditRiskExposureLineItems |
| 1002 |
Customer loans |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:LoansAndAdvancesToCustomers |
| 1003 |
NPLs |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:NonPerformingLoans |
| 1004 |
NPL ratio |
Concept (Percent) |
As Of |
|
ck0001087711:RatioOfNonPerformingLoans |
| 1005 |
Gross write-offs |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:GrossWriteoffs |
| 1006 |
Loss allowances |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:AllowanceAccountForCreditLossesOfFinancialAssets |
| 1007 |
1119 - Disclosure - Credit Risk - Summary of IFRS 9 Credit Quality (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfIFRS9CreditQuality |
| 1008 |
Disclosure of credit risk exposure [table] |
Table |
* |
* |
ifrs-full:DisclosureOfCreditRiskExposureTable |
| 1009 |
Classes of financial assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialAssetsAxis |
| 1010 |
Financial assets, class [member] |
Member |
|
|
ifrs-full:FinancialAssetsMember |
| 1011 |
Stage 1 [member] |
Member |
|
|
ck0001087711:StageOneMember |
| 1012 |
Stage 2 [member] |
Member |
|
|
ck0001087711:StageTwoMember |
| 1013 |
Stage 3 [member] |
Member |
|
|
ck0001087711:StageThreeMember |
| 1014 |
Credit risk exposure approach [axis] |
Axis |
|
|
ck0001087711:CreditRiskExposureApproachAxis |
| 1015 |
Credit risk exposure approach [member] |
Member |
|
|
ck0001087711:CreditRiskExposureApproachMember |
| 1016 |
Drawn exposures [member] |
Member |
|
|
ck0001087711:DrawnExposuresMember |
| 1017 |
Off-Balance Sheet Exposures [member] |
Member |
|
|
ck0001087711:OffbalanceSheetExposuresMember |
| 1018 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 1019 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 1020 |
Retail banking [member] |
Member |
|
|
ck0001087711:RetailBankingMember |
| 1021 |
Retail banking mortgages [member] |
Member |
|
|
ck0001087711:RetailBankingMortgagesMember |
| 1022 |
Corporate and commercial banking [member] |
Member |
|
|
ck0001087711:CorporateAndCommercialBankingMember |
| 1023 |
Corporate and investment banking [member] |
Member |
|
|
ck0001087711:CorporateAndInvestmentBankingMember |
| 1024 |
Corporate centre [member] |
Member |
|
|
ck0001087711:CorporateCentreMember |
| 1025 |
Stage Two Decomposition [axis] |
Axis |
|
|
ck0001087711:StageTwoDecompositionAxis |
| 1026 |
Stage Two Decomposition [member] |
Member |
|
|
ck0001087711:StageTwoDecompositionMember |
| 1027 |
Stage two below or equal to thirty DPD [member] |
Member |
|
|
ck0001087711:StageTwoBelowOrEqualToThirtyDpdMember |
| 1028 |
Stage 2, above 30 DPD [member] |
Member |
|
|
ck0001087711:StageTwoAboveThirtyDPDMember |
| 1029 |
Disclosure of credit risk exposure [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfCreditRiskExposureLineItems |
| 1030 |
Total exposures |
Concept (Monetary) |
As Of |
|
ifrs-full:CreditExposure |
| 1031 |
Loss Impairment: On Balance Sheet ECL |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:AllowanceAccountForCreditLossesOfFinancialAssets |
| 1032 |
Loss Impairment: Off Balance Sheet ECL |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:Provisions |
| 1033 |
Total ECL |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:TotalExpectedCreditLosses |
| 1034 |
Total coverage ratio |
Concept (Percent) |
As Of |
|
ck0001087711:CoverageRatio |
| 1035 |
1120 - Disclosure - Credit Risk - Summary of IFRS 9 Credit Quality (Parenthetical) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfIFRS9CreditQualityParenthetical |
| 1036 |
Implied Table |
Table |
* |
* |
implied:Table |
| 1037 |
Disclosure of credit risk exposure [abstract] |
Abstract |
|
|
ifrs-full:DisclosureOfCreditRiskExposureAbstract |
| 1038 |
Average PD percentage |
Concept (Percent) |
For Period |
|
ck0001087711:AssetsInDefaultProbabilityOfDefault |
| 1039 |
Retail mortgage offers in pipeline |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:RetailMortgageOffersInPipeline |
| 1040 |
1121 - Disclosure - Credit Risk - Summary of Stage 2 Decomposition (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfStage2Decomposition |
| 1041 |
Disclosure of credit risk exposure [table] |
Table |
* |
* |
ifrs-full:DisclosureOfCreditRiskExposureTable |
| 1042 |
Stage Two Decomposition [axis] |
Axis |
|
|
ck0001087711:StageTwoDecompositionAxis |
| 1043 |
Stage Two Decomposition [member] |
Member |
|
|
ck0001087711:StageTwoDecompositionMember |
| 1044 |
Currently in Arrears [member] |
Member |
|
|
ck0001087711:StageTwoBelowThirtyDpdMember |
| 1045 |
Deterioation in probability of default [member] |
Member |
|
|
ck0001087711:DeterioationInProbabilityOfDefaultMember |
| 1046 |
Other [member] |
Member |
|
|
ck0001087711:OtherMember |
| 1047 |
Classes of financial assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialAssetsAxis |
| 1048 |
Financial assets, class [member] |
Member |
|
|
ifrs-full:FinancialAssetsMember |
| 1049 |
Stage 2 [member] |
Member |
|
|
ck0001087711:StageTwoMember |
| 1050 |
Disclosure of credit risk exposure [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfCreditRiskExposureLineItems |
| 1051 |
Exposure |
Concept (Monetary) |
As Of |
|
ifrs-full:CreditExposure |
| 1052 |
1122 - Disclosure - Credit Risk - Summary of Reconciliation of Exposures, ECL and Net Carrying Amounts (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfReconciliationOfExposuresECLAndNetCarryingAmounts |
| 1053 |
Disclosure of credit risk exposure [table] |
Table |
* |
* |
ifrs-full:DisclosureOfCreditRiskExposureTable |
| 1054 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 1055 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 1056 |
Retail banking [member] |
Member |
|
|
ck0001087711:RetailBankingMember |
| 1057 |
Mortgages [member] |
Member |
|
|
ifrs-full:MortgagesMember |
| 1058 |
Corporate and commercial banking [member] |
Member |
|
|
ck0001087711:CorporateAndCommercialBankingMember |
| 1059 |
Corporate and investment banking [member] |
Member |
|
|
ck0001087711:CorporateAndInvestmentBankingMember |
| 1060 |
Corporate centre [member] |
Member |
|
|
ck0001087711:CorporateCentreMember |
| 1061 |
Types of risks [axis] |
Axis |
|
|
ifrs-full:TypesOfRisksAxis |
| 1062 |
Risks [member] |
Member |
|
|
ifrs-full:TypesOfRisksMember |
| 1063 |
Drawn exposures [member] |
Member |
|
|
ck0001087711:DrawnExposuresMember |
| 1064 |
Off-Balance Sheet Exposures [member] |
Member |
|
|
ck0001087711:OffbalanceSheetExposuresMember |
| 1065 |
Disclosure of credit risk exposure [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfCreditRiskExposureLineItems |
| 1066 |
Total exposures |
Concept (Monetary) |
As Of |
|
ifrs-full:CreditExposure |
| 1067 |
Total ECL on drawn exposures |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:AllowanceAccountForCreditLossesOfFinancialAssets |
| 1068 |
Total ECL on off-balance sheet exposures |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:Provisions |
| 1069 |
On-balance sheet net carrying amount |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:NetCreditExposure |
| 1070 |
Other items |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:OtherReconcilingItems |
| 1071 |
Adjusted net carrying amount |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:AdjustedNetCarryingAmount |
| 1072 |
Assets classified at FVTPL |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossMandatorilyMeasuredAtFairValue |
| 1073 |
Non-financial assets |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:NonFinancialAssets |
| 1074 |
Total assets |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:Assets |
| 1075 |
1123 - Disclosure - Credit Risk - Summary of ECL Reconciliation (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfECLReconciliation |
| 1076 |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [table] |
Table |
* |
* |
ifrs-full:DisclosureOfReconciliationOfChangesInLossAllowanceAndExplanationOfChangesInGrossCarryingAmountForFinancialInstrumentsTable |
| 1077 |
Credit impairment of financial instruments [axis] |
Axis |
|
|
ifrs-full:CreditImpairmentOfFinancialInstrumentsAxis |
| 1078 |
Credit impairment of financial instruments [member] |
Member |
|
|
ifrs-full:CreditImpairmentOfFinancialInstrumentsMember |
| 1079 |
Financial instruments not credit-impaired [member] |
Member |
|
|
ifrs-full:FinancialInstrumentsNotCreditimpairedMember |
| 1080 |
Financial instruments credit-impaired [member] |
Member |
|
|
ifrs-full:FinancialInstrumentsCreditimpairedMember |
| 1081 |
Type of measurement of expected credit losses [axis] |
Axis |
|
|
ifrs-full:TypeOfMeasurementOfExpectedCreditLossesAxis |
| 1082 |
Type of measurement of expected credit losses [member] |
Member |
|
|
ifrs-full:TypeOfMeasurementOfExpectedCreditLossesMember |
| 1083 |
Subject to 12-month ECL [member] |
Member |
|
|
ifrs-full:TwelvemonthExpectedCreditLossesMember |
| 1084 |
Subject to Lifetime ECL [member] |
Member |
|
|
ifrs-full:LifetimeExpectedCreditLossesMember |
| 1085 |
Classes of financial assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialAssetsAxis |
| 1086 |
Financial assets, class [member] |
Member |
|
|
ifrs-full:FinancialAssetsMember |
| 1087 |
Stage 1 [member] |
Member |
|
|
ck0001087711:StageOneMember |
| 1088 |
Stage 2 [member] |
Member |
|
|
ck0001087711:StageTwoMember |
| 1089 |
Stage 3 [member] |
Member |
|
|
ck0001087711:StageThreeMember |
| 1090 |
Method of assessment of expected credit losses [axis] |
Axis |
|
|
ifrs-full:MethodOfAssessmentOfExpectedCreditLossesAxis |
| 1091 |
Method of assessment of expected credit losses [member] |
Member |
|
|
ifrs-full:MethodOfAssessmentOfExpectedCreditLossesMember |
| 1092 |
Stage 1 ECL [member] |
Member |
|
|
ck0001087711:StageOneExpectedCreditLossMember |
| 1093 |
Stage 2 ECL [member] |
Member |
|
|
ck0001087711:StageTwoExpectedCreditLossMember |
| 1094 |
Stage 3 ECL [member] |
Member |
|
|
ck0001087711:StageThreeExpectedCreditLossMember |
| 1095 |
Total exposure [member] |
Member |
|
|
ck0001087711:TotalExposureMember |
| 1096 |
Expected credit loss [member] |
Member |
|
|
ck0001087711:ExpectedCreditLossMember |
| 1097 |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfReconciliationOfChangesInLossAllowanceAndExplanationOfChangesInGrossCarryingAmountForFinancialInstrumentsLineItems |
| 1098 |
Beginning balance |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:TotalExpectedCreditLosses |
| 1099 |
Beginning balance |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssets |
| 1100 |
Change in economic scenarios |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:IncreaseDecreaseThroughChangesInEconomicInputs |
| 1101 |
Changes to model |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:IncreaseDecreaseThroughChangesInModelsOrRiskParametersFinancialAssets |
| 1102 |
Transfer to lifetime ECL (not-credit impaired) |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:IncreaseDecreaseThroughTransfersToLifetimeEclNotCreditImpairedFinancialAssets |
| 1103 |
Transfer to credit impaired |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:IncreaseDecreaseThroughTransfersToCreditImpairedFinancialAssets |
| 1104 |
Transfer to 12-month ECL |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:IncreaseDecreaseThroughTransfersToTwelveMonthEclFinancialAssets |
| 1105 |
Transfer from credit impaired |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:IncreaseDecreaseThroughTransfersFromCreditImpairedFinancialAssets |
| 1106 |
Transfer of financial instruments |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:IncreaseDecreaseThroughTransfersFinancialAssets |
| 1107 |
Net re-measurement of ECL arising from transfer of stage |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:IncreaseDecreaseThroughNetRemeasurementOfECLOnStageTransfer |
| 1108 |
New assets originated or purchased |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:IncreaseThroughOriginationOrPurchaseFinancialAssets |
| 1109 |
Other |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:IncreaseDecreaseThroughOtherMovementsFinancialAssets |
| 1110 |
Assets derecognised - closed good |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:DecreaseThroughDerecognitionFinancialAssets |
| 1111 |
Assets derecognised - written off |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:DecreaseThroughWriteoffFinancialAssets |
| 1112 |
Ending balance |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:TotalExpectedCreditLosses |
| 1113 |
Ending balance |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssets |
| 1114 |
Net movement in the year |
Concept (Monetary) |
As Of |
|
ck0001087711:IncreaseDecreaseInTotalExpectedCreditLosses |
| 1115 |
Net movement in the year |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:IncreaseDecreaseInTotalFinancialAssets |
| 1116 |
Income statement charge/(release) for the year |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:GrossImpairmentLossIncomeStatementCharge |
| 1117 |
Recoveries net of collection costs |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:FinancialAssetsPostWriteoffRecoveries |
| 1118 |
Charge/(release) to the Income Statement |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:ImpairmentLossOnFinancialAssets |
| 1119 |
1124 - Disclosure - Credit Risk - Summary of Country Risk Exposure (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfCountryRiskExposure |
| 1120 |
Disclosure of credit risk exposure [table] |
Table |
* |
* |
ifrs-full:DisclosureOfCreditRiskExposureTable |
| 1121 |
Geographical areas [axis] |
Axis |
|
|
ifrs-full:GeographicalAreasAxis |
| 1122 |
Geographical areas [member] |
Member |
|
|
ifrs-full:GeographicalAreasMember |
| 1123 |
Eurozone Countries [member] |
Member |
|
|
ifrs-full:CountryOfDomicileMember |
| 1124 |
All Other Countries [member] |
Member |
|
|
ifrs-full:ForeignCountriesMember |
| 1125 |
All Countries Excluding Eurozone Countries [member] |
Member |
|
|
ck0001087711:AllCountriesExcludingEurozoneCountriesMember |
| 1126 |
Counterparties [axis] |
Axis |
|
|
ifrs-full:CounterpartiesAxis |
| 1127 |
Counterparties [member] |
Member |
|
|
ifrs-full:CounterpartiesMember |
| 1128 |
Governments [member] |
Member |
|
|
ifrs-full:GovernmentMember |
| 1129 |
Government Guaranteed [member] |
Member |
|
|
ck0001087711:GovernmentGuaranteedMember |
| 1130 |
Banks [member] |
Member |
|
|
ck0001087711:BankMember |
| 1131 |
Other Financial Institutions [member] |
Member |
|
|
ck0001087711:OtherFinancialInstitutionsMember |
| 1132 |
Retail [member] |
Member |
|
|
ck0001087711:RetailMember |
| 1133 |
Corporate counterparty [member] |
Member |
|
|
ck0001087711:CorporateCounterpartyMember |
| 1134 |
Geographical [Axis] |
Axis |
|
|
srt:StatementGeographicalAxis |
| 1135 |
Geographical [Domain] |
Member |
|
|
srt:SegmentGeographicalDomain |
| 1136 |
Ireland [member] |
Member |
|
|
country:IE |
| 1137 |
Italy [member] |
Member |
|
|
country:IT |
| 1138 |
Spain (excl. Banco Santander) [member] |
Member |
|
|
country:ES |
| 1139 |
Portugal [member] |
Member |
|
|
country:PT |
| 1140 |
France [member] |
Member |
|
|
country:FR |
| 1141 |
Germany [member] |
Member |
|
|
country:DE |
| 1142 |
Luxembourg [member] |
Member |
|
|
country:LU |
| 1143 |
Other [member] |
Member |
|
|
ck0001087711:OtherCountriesMember |
| 1144 |
UK [member] |
Member |
|
|
country:GB |
| 1145 |
US [member] |
Member |
|
|
country:US |
| 1146 |
Japan [member] |
Member |
|
|
country:JP |
| 1147 |
Switzerland [member] |
Member |
|
|
country:CH |
| 1148 |
Denmark [member] |
Member |
|
|
country:DK |
| 1149 |
Disclosure of credit risk exposure [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfCreditRiskExposureLineItems |
| 1150 |
Risk exposures |
Concept (Monetary) |
As Of |
|
ifrs-full:CreditExposure |
| 1151 |
1125 - Disclosure - Credit Risk - Summary of Country Risk Exposure (Parenthetical) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfCountryRiskExposureParenthetical |
| 1152 |
Disclosure of credit risk exposure [table] |
Table |
* |
* |
ifrs-full:DisclosureOfCreditRiskExposureTable |
| 1153 |
Geographical areas [axis] |
Axis |
|
|
ifrs-full:GeographicalAreasAxis |
| 1154 |
Geographical areas [member] |
Member |
|
|
ifrs-full:GeographicalAreasMember |
| 1155 |
Eurozone Countries [member] |
Member |
|
|
ck0001087711:EuroZoneCountriesMember |
| 1156 |
Geographical [Axis] |
Axis |
|
|
srt:StatementGeographicalAxis |
| 1157 |
Geographical [Domain] |
Member |
|
|
srt:SegmentGeographicalDomain |
| 1158 |
Netherlands [member] |
Member |
|
|
country:NL |
| 1159 |
Belgium [Member] |
Member |
|
|
country:BE |
| 1160 |
Greece [member] |
Member |
|
|
country:GR |
| 1161 |
Disclosure of credit risk exposure [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfCreditRiskExposureLineItems |
| 1162 |
Risk exposures |
Concept (Monetary) |
As Of |
|
ifrs-full:CreditExposure |
| 1163 |
1126 - Disclosure - Credit Risk - Summary of Balances with Other Banco Santander Companies (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfBalancesWithOtherBancoSantanderCompanies |
| 1164 |
Disclosure of detailed information about financial instruments [table] |
Table |
* |
* |
ifrs-full:DisclosureOfFinancialInstrumentsTable |
| 1165 |
Counterparties [axis] |
Axis |
|
|
ifrs-full:CounterpartiesAxis |
| 1166 |
Counterparties [member] |
Member |
|
|
ifrs-full:CounterpartiesMember |
| 1167 |
Banks [member] |
Member |
|
|
ck0001087711:BankMember |
| 1168 |
Other Financial Institutions [member] |
Member |
|
|
ck0001087711:OtherFinancialInstitutionsMember |
| 1169 |
Corporate counterparty [member] |
Member |
|
|
ck0001087711:CorporateCounterpartyMember |
| 1170 |
Categories of related parties [axis] |
Axis |
|
|
ifrs-full:CategoriesOfRelatedPartiesAxis |
| 1171 |
Entity's total for related parties [member] |
Member |
|
|
ifrs-full:EntitysTotalForRelatedPartiesMember |
| 1172 |
Santander UK Group Holdings plc [member] |
Member |
|
|
ifrs-full:ParentMember |
| 1173 |
Geographical [Axis] |
Axis |
|
|
srt:StatementGeographicalAxis |
| 1174 |
Geographical [Domain] |
Member |
|
|
srt:SegmentGeographicalDomain |
| 1175 |
Spain (excl. Banco Santander) [member] |
Member |
|
|
country:ES |
| 1176 |
UK [member] |
Member |
|
|
country:GB |
| 1177 |
Uruguay [member] |
Member |
|
|
country:UY |
| 1178 |
Other [member] |
Member |
|
|
ck0001087711:OtherCountriesMember |
| 1179 |
Disclosure of detailed information about financial instruments [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfFinancialInstrumentsLineItems |
| 1180 |
Financial assets |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssets |
| 1181 |
Financial liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:FinancialLiabilities |
| 1182 |
1127 - Disclosure - Credit Risk - Summary of Balances with Other Banco Santander Companies (Parenthetical) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfBalancesWithOtherBancoSantanderCompaniesParenthetical |
| 1183 |
Disclosure of detailed information about financial instruments [table] |
Table |
* |
* |
ifrs-full:DisclosureOfFinancialInstrumentsTable |
| 1184 |
Categories of related parties [axis] |
Axis |
|
|
ifrs-full:CategoriesOfRelatedPartiesAxis |
| 1185 |
Entity's total for related parties [member] |
Member |
|
|
ifrs-full:EntitysTotalForRelatedPartiesMember |
| 1186 |
Santander UK Group Holdings plc [member] |
Member |
|
|
ifrs-full:ParentMember |
| 1187 |
Range [axis] |
Axis |
|
|
ifrs-full:RangeAxis |
| 1188 |
Ranges [member] |
Member |
|
|
ifrs-full:RangesMember |
| 1189 |
Top of Range [member] |
Member |
|
|
ifrs-full:TopOfRangeMember |
| 1190 |
Disclosure of detailed information about financial instruments [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfFinancialInstrumentsLineItems |
| 1191 |
Financial liabilities allocated to other countries |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:FinancialLiabilitiesAllocatedToOtherCountries |
| 1192 |
1128 - Disclosure - Credit Risk - Summary of Types of Credit Risk Mitigation (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfTypesOfCreditRiskMitigation |
| 1193 |
Disclosure of credit risk exposure [table] |
Table |
* |
* |
ifrs-full:DisclosureOfCreditRiskExposureTable |
| 1194 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 1195 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 1196 |
Residential mortgages [member] |
Member |
|
|
ck0001087711:ResidentialMortgagesMember |
| 1197 |
Business Banking [member] |
Member |
|
|
ck0001087711:BusinessBankingMember |
| 1198 |
Consumer (auto) finance [member] |
Member |
|
|
ck0001087711:ConsumerFinanceMember |
| 1199 |
Unsecured Lending [member] |
Member |
|
|
ck0001087711:UnsecuredLendingMember |
| 1200 |
Disclosure of credit risk exposure [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfCreditRiskExposureLineItems |
| 1201 |
Types of credit risk mitigation, including collateral, across portfolios |
Concept (Text/String) |
For Period |
|
ck0001087711:CreditRiskMitigationDescription |
| 1202 |
1129 - Disclosure - Credit Risk - Summary of ECL Reconciliation for Retail Segment (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfECLReconciliationForRetailSegment |
| 1203 |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [table] |
Table |
* |
* |
ifrs-full:DisclosureOfReconciliationOfChangesInLossAllowanceAndExplanationOfChangesInGrossCarryingAmountForFinancialInstrumentsTable |
| 1204 |
Credit impairment of financial instruments [axis] |
Axis |
|
|
ifrs-full:CreditImpairmentOfFinancialInstrumentsAxis |
| 1205 |
Credit impairment of financial instruments [member] |
Member |
|
|
ifrs-full:CreditImpairmentOfFinancialInstrumentsMember |
| 1206 |
Financial instruments not credit-impaired [member] |
Member |
|
|
ifrs-full:FinancialInstrumentsNotCreditimpairedMember |
| 1207 |
Financial instruments credit-impaired [member] |
Member |
|
|
ifrs-full:FinancialInstrumentsCreditimpairedMember |
| 1208 |
Method of assessment of expected credit losses [axis] |
Axis |
|
|
ifrs-full:MethodOfAssessmentOfExpectedCreditLossesAxis |
| 1209 |
Method of assessment of expected credit losses [member] |
Member |
|
|
ifrs-full:MethodOfAssessmentOfExpectedCreditLossesMember |
| 1210 |
Stage 1 ECL [member] |
Member |
|
|
ck0001087711:StageOneExpectedCreditLossMember |
| 1211 |
Stage 2 ECL [member] |
Member |
|
|
ck0001087711:StageTwoExpectedCreditLossMember |
| 1212 |
Stage 3 ECL [member] |
Member |
|
|
ck0001087711:StageThreeExpectedCreditLossMember |
| 1213 |
Total exposure [member] |
Member |
|
|
ck0001087711:TotalExposureMember |
| 1214 |
Expected credit loss [member] |
Member |
|
|
ck0001087711:ExpectedCreditLossMember |
| 1215 |
Type of measurement of expected credit losses [axis] |
Axis |
|
|
ifrs-full:TypeOfMeasurementOfExpectedCreditLossesAxis |
| 1216 |
Type of measurement of expected credit losses [member] |
Member |
|
|
ifrs-full:TypeOfMeasurementOfExpectedCreditLossesMember |
| 1217 |
Subject to 12-month ECL [member] |
Member |
|
|
ifrs-full:TwelvemonthExpectedCreditLossesMember |
| 1218 |
Subject to Lifetime ECL [member] |
Member |
|
|
ifrs-full:LifetimeExpectedCreditLossesMember |
| 1219 |
Classes of financial assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialAssetsAxis |
| 1220 |
Financial assets, class [member] |
Member |
|
|
ifrs-full:FinancialAssetsMember |
| 1221 |
Stage 1 [member] |
Member |
|
|
ck0001087711:StageOneMember |
| 1222 |
Stage 2 [member] |
Member |
|
|
ck0001087711:StageTwoMember |
| 1223 |
Stage 3 [member] |
Member |
|
|
ck0001087711:StageThreeMember |
| 1224 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 1225 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 1226 |
Retail banking [member] |
Member |
|
|
ck0001087711:RetailBankingMember |
| 1227 |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfReconciliationOfChangesInLossAllowanceAndExplanationOfChangesInGrossCarryingAmountForFinancialInstrumentsLineItems |
| 1228 |
Beginning balance |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:TotalExpectedCreditLosses |
| 1229 |
Beginning balance |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssets |
| 1230 |
Change in economic scenarios |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:IncreaseDecreaseThroughChangesInEconomicInputs |
| 1231 |
Changes to model |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:IncreaseDecreaseThroughChangesInModelsOrRiskParametersFinancialAssets |
| 1232 |
Transfer to lifetime ECL (not-credit impaired) |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:IncreaseDecreaseThroughTransfersToLifetimeEclNotCreditImpairedFinancialAssets |
| 1233 |
Transfer to credit impaired |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:IncreaseDecreaseThroughTransfersToCreditImpairedFinancialAssets |
| 1234 |
Transfer to 12-monthECL |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:IncreaseDecreaseThroughTransfersToTwelveMonthEclFinancialAssets |
| 1235 |
Transfer from credit impaired |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:IncreaseDecreaseThroughTransfersFromCreditImpairedFinancialAssets |
| 1236 |
Transfers of financial instruments |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:IncreaseDecreaseThroughTransfersFinancialAssets |
| 1237 |
Net remeasurement of ECL on stage transfer |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:IncreaseDecreaseThroughNetRemeasurementOfECLOnStageTransfer |
| 1238 |
New assets originated or purchased |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:IncreaseThroughOriginationOrPurchaseFinancialAssets |
| 1239 |
Other |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:IncreaseDecreaseThroughOtherMovementsFinancialAssets |
| 1240 |
Assets derecognised - closed good |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:DecreaseThroughDerecognitionFinancialAssets |
| 1241 |
Assets derecognised - written off |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:DecreaseThroughWriteoffFinancialAssets |
| 1242 |
Ending balance |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:TotalExpectedCreditLosses |
| 1243 |
Ending balance |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssets |
| 1244 |
Net movement in the year |
Concept (Monetary) |
As Of |
|
ck0001087711:IncreaseDecreaseInTotalExpectedCreditLosses |
| 1245 |
Net movement in the year |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:IncreaseDecreaseInTotalFinancialAssets |
| 1246 |
Charge/(release) to the Income Statement |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:GrossImpairmentLossIncomeStatementCharge |
| 1247 |
Recoveries net of collection costs |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:FinancialAssetsPostWriteoffRecoveries |
| 1248 |
Income statement charge/(release) for the year |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:ImpairmentLossOnFinancialAssets |
| 1249 |
1130 - Disclosure - Credit Risk - Summary of Residential Mortgages by Borrower Profile (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfResidentialMortgagesByBorrowerProfile |
| 1250 |
Disclosure of credit risk exposure [table] |
Table |
* |
* |
ifrs-full:DisclosureOfCreditRiskExposureTable |
| 1251 |
Type of measurement of expected credit losses [axis] |
Axis |
|
|
ifrs-full:TypeOfMeasurementOfExpectedCreditLossesAxis |
| 1252 |
Type of measurement of expected credit losses [member] |
Member |
|
|
ifrs-full:TypeOfMeasurementOfExpectedCreditLossesMember |
| 1253 |
First-Time Buyers [member] |
Member |
|
|
ck0001087711:FirstTimeBuyersMember |
| 1254 |
Home Movers [member] |
Member |
|
|
ck0001087711:HomeMoversMember |
| 1255 |
Remortgagers [member] |
Member |
|
|
ck0001087711:RemortgagersMember |
| 1256 |
Buy-To-Let [member] |
Member |
|
|
ck0001087711:BuyToLetMember |
| 1257 |
Method of assessment of expected credit losses [axis] |
Axis |
|
|
ifrs-full:MethodOfAssessmentOfExpectedCreditLossesAxis |
| 1258 |
Method of assessment of expected credit losses [member] |
Member |
|
|
ifrs-full:MethodOfAssessmentOfExpectedCreditLossesMember |
| 1259 |
Stock [member] |
Member |
|
|
ck0001087711:StockMember |
| 1260 |
New Business [member] |
Member |
|
|
ck0001087711:NewBusinessMember |
| 1261 |
Types of risks [axis] |
Axis |
|
|
ifrs-full:TypesOfRisksAxis |
| 1262 |
Risks [member] |
Member |
|
|
ifrs-full:TypesOfRisksMember |
| 1263 |
Credit risk [member] |
Member |
|
|
ifrs-full:CreditRiskMember |
| 1264 |
Disclosure of credit risk exposure [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfCreditRiskExposureLineItems |
| 1265 |
Residential mortgage loans |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:ResidentialMortgageLoans |
| 1266 |
Percentage of residential mortgage loans |
Concept (Percent) |
As Of |
|
ck0001087711:ResidentialMortgageLoansPercentage |
| 1267 |
1131 - Disclosure - Credit Risk - Additional Information (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskAdditionalInformation |
| 1268 |
Disclosure of internal credit grades [table] |
Table |
* |
* |
ifrs-full:DisclosureOfInternalCreditExposuresTable |
| 1269 |
Range [axis] |
Axis |
|
|
ifrs-full:RangeAxis |
| 1270 |
Ranges [member] |
Member |
|
|
ifrs-full:RangesMember |
| 1271 |
Greater Than 2.0m [member] |
Member |
|
|
ck0001087711:RangeFiveMember |
| 1272 |
Less Than 70% [member] |
Member |
|
|
ck0001087711:LessThanOrEqualToSeventyPercentageMember |
| 1273 |
Type of measurement of expected credit losses [axis] |
Axis |
|
|
ifrs-full:TypeOfMeasurementOfExpectedCreditLossesAxis |
| 1274 |
Type of measurement of expected credit losses [member] |
Member |
|
|
ifrs-full:TypeOfMeasurementOfExpectedCreditLossesMember |
| 1275 |
Internal Remortgages [member] |
Member |
|
|
ck0001087711:InternalRemortgagesMember |
| 1276 |
Products and services [axis] |
Axis |
|
|
ifrs-full:ProductsAndServicesAxis |
| 1277 |
Products and services [member] |
Member |
|
|
ifrs-full:ProductsAndServicesMember |
| 1278 |
Development Loans [member] |
Member |
|
|
ck0001087711:DevelopmentLoansMember |
| 1279 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 1280 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 1281 |
Corporate and investment banking [member] |
Member |
|
|
ck0001087711:CorporateAndInvestmentBankingMember |
| 1282 |
Commercial Real Estate [member] |
Member |
|
|
ck0001087711:CommercialRealEstate1Member |
| 1283 |
Classes of financial instruments [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialInstrumentsAxis |
| 1284 |
Financial instruments, class [member] |
Member |
|
|
ifrs-full:ClassesOfFinancialInstrumentsMember |
| 1285 |
Mortgages [member] |
Member |
|
|
ifrs-full:MortgagesMember |
| 1286 |
Pre Two Thousand Nine Loans [member] |
Member |
|
|
ck0001087711:PreTwoThousandNineLoansMember |
| 1287 |
Corporate loans [member] |
Member |
|
|
ifrs-full:CorporateLoansMember |
| 1288 |
Customer Loans [member] |
Member |
|
|
ck0001087711:CustomerLoansMember |
| 1289 |
Legacy Portfolios in Run-Off [member] |
Member |
|
|
ck0001087711:LegacyPortfoliosInRunoffMember |
| 1290 |
Classes of financial assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialAssetsAxis |
| 1291 |
Financial assets, class [member] |
Member |
|
|
ifrs-full:FinancialAssetsMember |
| 1292 |
Corporate and commercial banking [member] |
Member |
|
|
ck0001087711:CorporateAndCommercialBankingMember |
| 1293 |
Non performing loans [member] |
Member |
|
|
ck0001087711:NonPerformingLoansMember |
| 1294 |
Types of risks [axis] |
Axis |
|
|
ifrs-full:TypesOfRisksAxis |
| 1295 |
Risks [member] |
Member |
|
|
ifrs-full:TypesOfRisksMember |
| 1296 |
Credit risk [member] |
Member |
|
|
ifrs-full:CreditRiskMember |
| 1297 |
Maturity [axis] |
Axis |
|
|
ifrs-full:MaturityAxis |
| 1298 |
Aggregated time bands [member] |
Member |
|
|
ifrs-full:AggregatedTimeBandsMember |
| 1299 |
Not Later Than 1 Year [member] |
Member |
|
|
ifrs-full:NotLaterThanOneYearMember |
| 1300 |
Disclosure of internal credit grades [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfInternalCreditExposuresLineItems |
| 1301 |
Internal remortgages |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:ResidentialMortgageLoansNewBusiness |
| 1302 |
Advances and flexible mortgage drawdowns |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:AdvancesAndFlexibleMortgageDrawdowns |
| 1303 |
Number of individual mortgage loans |
Concept (Integer) |
As Of |
|
ck0001087711:NumberOfResidentialMortgageLoans |
| 1304 |
New business number of individual mortgage loans |
Concept (Integer) |
As Of |
|
ck0001087711:NumberOfResidentialMortgageLoansNewBusiness |
| 1305 |
Parts of the loans in negative equity that were effectively uncollateralised |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:UncollateralisedLoans |
| 1306 |
Average consumer finance loan size |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:AverageConsumerFinanceLoanSize |
| 1307 |
Average unsecured loan |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:AverageUnsecuredLoan |
| 1308 |
Credit card balances |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:CreditCardBalance |
| 1309 |
Percenatage of reverse repos to exposure |
Concept (Percent) |
For Period |
|
ck0001087711:PercentageOfCollateralHeldForReverseReposToExposure |
| 1310 |
Percentage of collateral held against impaired loans |
Concept (Percent) |
As Of |
|
ck0001087711:CollateralHeldAgainstImpairedLoansPercentage |
| 1311 |
Collateral held against Credit impaired assets |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:CollateralHeldAgainstLoanCreditimpairedAssets |
| 1312 |
Credit impaired assets |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:CreditimpairedAssets |
| 1313 |
Number of clients |
Concept (Integer) |
As Of |
|
ck0001087711:NumberOfClients |
| 1314 |
Rate of derivative exposure with client |
Concept (Percent) |
As Of |
|
ck0001087711:DerivativeExposureWithClientPercentage |
| 1315 |
Weighted-average credit rating percent |
Concept (Percent) |
As Of |
|
ifrs-full:ExpectedCreditLossRate |
| 1316 |
Cash collateral held against portfolio |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:CashCollateralPledgedSubjectToEnforceableMasterNettingArrangementOrSimilarAgreementNotSetOffAgainstFinancialLiabilities |
| 1317 |
Loans written down |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:LoansAndAdvancesToCustomersWrittenDown |
| 1318 |
Loan percentage |
Concept (Percent) |
As Of |
|
ck0001087711:PercentageOfLendingToCorporates |
| 1319 |
Loan percentage |
Concept (Percent) |
As Of |
|
ck0001087711:PercentageOfLendingToCustomers |
| 1320 |
Loans and advances to customers |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:LoansAndAdvancesToCustomers |
| 1321 |
Percentage of loan to value |
Concept (Percent) |
As Of |
|
ck0001087711:PercentageOfLoanToValueStock |
| 1322 |
Loan percentage |
Concept (Percent) |
For Period |
|
ck0001087711:PercentageOfLoansWithDevelopmentRiskInCommercialRealEstatePortfolio |
| 1323 |
Average loan balance |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:AverageLoans |
| 1324 |
Loans and advances to customers with higher LTV ratio |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:LoansAndAdvancesToCustomersWithHigherLoanToValueRatio |
| 1325 |
Percentage of maximum acceptable LTV ratio |
Concept (Percent) |
For Period |
|
ck0001087711:PercentageOfAcceptableMaximumLoanToValueRatio |
| 1326 |
Impairment loss allowance |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:ImpairmentLossAllowances |
| 1327 |
1132 - Disclosure - Credit Risk - Summary of Residential Mortgages by Interest Rate Profile (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfResidentialMortgagesByInterestRateProfile |
| 1328 |
Disclosure of credit risk exposure [table] |
Table |
* |
* |
ifrs-full:DisclosureOfCreditRiskExposureTable |
| 1329 |
Types of interest rates [axis] |
Axis |
|
|
ifrs-full:TypesOfInterestRatesAxis |
| 1330 |
Interest rate types [member] |
Member |
|
|
ifrs-full:InterestRateTypesMember |
| 1331 |
Fixed Rate [member] |
Member |
|
|
ifrs-full:FixedInterestRateMember |
| 1332 |
Variable Rate [member] |
Member |
|
|
ifrs-full:FloatingInterestRateMember |
| 1333 |
Standard Variable Rate [member] |
Member |
|
|
ck0001087711:StandardVariableRateMember |
| 1334 |
Method of assessment of expected credit losses [axis] |
Axis |
|
|
ifrs-full:MethodOfAssessmentOfExpectedCreditLossesAxis |
| 1335 |
Method of assessment of expected credit losses [member] |
Member |
|
|
ifrs-full:MethodOfAssessmentOfExpectedCreditLossesMember |
| 1336 |
Stock [member] |
Member |
|
|
ck0001087711:StockMember |
| 1337 |
Types of risks [axis] |
Axis |
|
|
ifrs-full:TypesOfRisksAxis |
| 1338 |
Risks [member] |
Member |
|
|
ifrs-full:TypesOfRisksMember |
| 1339 |
Credit risk [member] |
Member |
|
|
ifrs-full:CreditRiskMember |
| 1340 |
Disclosure of credit risk exposure [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfCreditRiskExposureLineItems |
| 1341 |
Residential mortgage loans |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:ResidentialMortgageLoans |
| 1342 |
Percentage of residential mortgage loans |
Concept (Percent) |
As Of |
|
ck0001087711:ResidentialMortgageLoansPercentage |
| 1343 |
1133 - Disclosure - Credit Risk - Summary of Residential Mortgages by Geographical Distribution (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfResidentialMortgagesByGeographicalDistribution |
| 1344 |
Disclosure of credit risk exposure [table] |
Table |
* |
* |
ifrs-full:DisclosureOfCreditRiskExposureTable |
| 1345 |
Geographical areas [axis] |
Axis |
|
|
ifrs-full:GeographicalAreasAxis |
| 1346 |
Geographical areas [member] |
Member |
|
|
ifrs-full:GeographicalAreasMember |
| 1347 |
London [member] |
Member |
|
|
ck0001087711:LondonMember |
| 1348 |
Midlands and East Anglia [member] |
Member |
|
|
ck0001087711:MidlandsAndEastAngliaMember |
| 1349 |
North UK [member] |
Member |
|
|
ck0001087711:NorthUKMember |
| 1350 |
Northern Ireland [member] |
Member |
|
|
ck0001087711:NorthernIrelandMember |
| 1351 |
Scotland [member] |
Member |
|
|
ck0001087711:ScotlandMember |
| 1352 |
South East Excluding London [member] |
Member |
|
|
ck0001087711:SouthEastExcludingLondonMember |
| 1353 |
South West and Wales and Other [member] |
Member |
|
|
ck0001087711:SouthWestAndWalesAndOtherMember |
| 1354 |
Types of risks [axis] |
Axis |
|
|
ifrs-full:TypesOfRisksAxis |
| 1355 |
Risks [member] |
Member |
|
|
ifrs-full:TypesOfRisksMember |
| 1356 |
Credit risk [member] |
Member |
|
|
ifrs-full:CreditRiskMember |
| 1357 |
Method of assessment of expected credit losses [axis] |
Axis |
|
|
ifrs-full:MethodOfAssessmentOfExpectedCreditLossesAxis |
| 1358 |
Method of assessment of expected credit losses [member] |
Member |
|
|
ifrs-full:MethodOfAssessmentOfExpectedCreditLossesMember |
| 1359 |
Stock [member] |
Member |
|
|
ck0001087711:StockMember |
| 1360 |
New Business [member] |
Member |
|
|
ck0001087711:NewBusinessMember |
| 1361 |
Disclosure of credit risk exposure [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfCreditRiskExposureLineItems |
| 1362 |
Residential mortgage loans |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:ResidentialMortgageLoans |
| 1363 |
1134 - Disclosure - Credit Risk - Summary of Residential Mortgages by Average Loan Size for New Business (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfResidentialMortgagesByAverageLoanSizeForNewBusiness |
| 1364 |
Disclosure of credit risk exposure [table] |
Table |
* |
* |
ifrs-full:DisclosureOfCreditRiskExposureTable |
| 1365 |
Geographical areas [axis] |
Axis |
|
|
ifrs-full:GeographicalAreasAxis |
| 1366 |
Geographical areas [member] |
Member |
|
|
ifrs-full:GeographicalAreasMember |
| 1367 |
South East Including London [member] |
Member |
|
|
ck0001087711:SouthEastIncludingLondonMember |
| 1368 |
Rest of UK [member] |
Member |
|
|
ck0001087711:RestOfUKMember |
| 1369 |
UK [member] |
Member |
|
|
country:GB |
| 1370 |
Disclosure of credit risk exposure [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfCreditRiskExposureLineItems |
| 1371 |
New business residential mortgage loans average size |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:ResidentialMortgageLoansNewBusinessAverageSize |
| 1372 |
1135 - Disclosure - Credit Risk - Summary of Residential Mortgages by Loan Size (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfResidentialMortgagesByLoanSize |
| 1373 |
Disclosure of credit risk exposure [table] |
Table |
* |
* |
ifrs-full:DisclosureOfCreditRiskExposureTable |
| 1374 |
Range [axis] |
Axis |
|
|
ifrs-full:RangeAxis |
| 1375 |
Ranges [member] |
Member |
|
|
ifrs-full:RangesMember |
| 1376 |
Less Than 0.25m [member] |
Member |
|
|
ck0001087711:RangeOneMember |
| 1377 |
0.25m-0.50m[member] |
Member |
|
|
ck0001087711:RangeTwoMember |
| 1378 |
0.50m-1.0m [member] |
Member |
|
|
ck0001087711:RangeThreeMember |
| 1379 |
1.0m-2.0m [member] |
Member |
|
|
ck0001087711:RangeFourMember |
| 1380 |
Greater Than 2.0m [member] |
Member |
|
|
ck0001087711:RangeFiveMember |
| 1381 |
Types of risks [axis] |
Axis |
|
|
ifrs-full:TypesOfRisksAxis |
| 1382 |
Risks [member] |
Member |
|
|
ifrs-full:TypesOfRisksMember |
| 1383 |
Credit risk [member] |
Member |
|
|
ifrs-full:CreditRiskMember |
| 1384 |
Geographical areas [axis] |
Axis |
|
|
ifrs-full:GeographicalAreasAxis |
| 1385 |
Geographical areas [member] |
Member |
|
|
ifrs-full:GeographicalAreasMember |
| 1386 |
South East Including London [member] |
Member |
|
|
ck0001087711:SouthEastIncludingLondonMember |
| 1387 |
UK [member] |
Member |
|
|
country:GB |
| 1388 |
Disclosure of credit risk exposure [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfCreditRiskExposureLineItems |
| 1389 |
Residential mortgage loans |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:ResidentialMortgageLoans |
| 1390 |
1136 - Disclosure - Credit Risk - Summary of Residential Mortgages by Loan to Value (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfResidentialMortgagesByLoanToValue |
| 1391 |
Disclosure of credit risk exposure [table] |
Table |
* |
* |
ifrs-full:DisclosureOfCreditRiskExposureTable |
| 1392 |
Range [axis] |
Axis |
|
|
ifrs-full:RangeAxis |
| 1393 |
Ranges [member] |
Member |
|
|
ifrs-full:RangesMember |
| 1394 |
Up to 50% [member] |
Member |
|
|
ck0001087711:UpToFiftyPercentageMember |
| 1395 |
50 - 75% [member] |
Member |
|
|
ck0001087711:FiftyToSeventyFivePercentageMember |
| 1396 |
75 - 85% [member] |
Member |
|
|
ck0001087711:SeventyFiveToEightyFivePercentageMember |
| 1397 |
85 - 100% [member] |
Member |
|
|
ck0001087711:EightyFiveToHundredPercentageMember |
| 1398 |
Greater Than 100% [member] |
Member |
|
|
ck0001087711:GreaterThanHundredPercentageMember |
| 1399 |
Simple Average [member] |
Member |
|
|
ck0001087711:SimpleAverageMember |
| 1400 |
Valuation Weighted Average LTV [member] |
Member |
|
|
ck0001087711:ValuationWeightedAverageMember |
| 1401 |
Types of risks [axis] |
Axis |
|
|
ifrs-full:TypesOfRisksAxis |
| 1402 |
Risks [member] |
Member |
|
|
ifrs-full:TypesOfRisksMember |
| 1403 |
Credit risk [member] |
Member |
|
|
ifrs-full:CreditRiskMember |
| 1404 |
Disclosure of credit risk exposure [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfCreditRiskExposureLineItems |
| 1405 |
Percentage of loan to value, Stock |
Concept (Percent) |
As Of |
|
ck0001087711:PercentageOfLoanToValueResidentialMortgages |
| 1406 |
Collateral value of residential properties, Stock |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:CollateralValueOfResidentialProperties |
| 1407 |
Percentage of loan to value, NPL stock |
Concept (Percent) |
As Of |
|
ck0001087711:PercentageOfLoanToValueResidentialMortgagesNPLStock |
| 1408 |
Collateral value of residential properties, NPL stock |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:CollateralValueOfResidentialPropertiesNPLStock |
| 1409 |
Percentage of loan to value, New business |
Concept (Percent) |
As Of |
|
ck0001087711:PercentageOfLoanToValueResidentialMortgagesNewBusiness |
| 1410 |
Collateral value of residential properties, New business |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:CollateralValueOfResidentialPropertiesNewBusiness |
| 1411 |
1137 - Disclosure - Credit Risk - Summary of Residential Mortgages by Loan to Value (Parenthetical) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfResidentialMortgagesByLoanToValueParenthetical |
| 1412 |
Disclosure of credit risk exposure [table] |
Table |
* |
* |
ifrs-full:DisclosureOfCreditRiskExposureTable |
| 1413 |
Types of risks [axis] |
Axis |
|
|
ifrs-full:TypesOfRisksAxis |
| 1414 |
Risks [member] |
Member |
|
|
ifrs-full:TypesOfRisksMember |
| 1415 |
Credit risk [member] |
Member |
|
|
ifrs-full:CreditRiskMember |
| 1416 |
Disclosure of credit risk exposure [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfCreditRiskExposureLineItems |
| 1417 |
Collateral against loans in negative equity |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:CollateralValueOfResidentialPropertiesInNegativeEquity |
| 1418 |
1138 - Disclosure - Credit Risk - Summary of Residential Mortgages by Credit Performance (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfResidentialMortgagesByCreditPerformance |
| 1419 |
Disclosure of credit risk exposure [table] |
Table |
* |
* |
ifrs-full:DisclosureOfCreditRiskExposureTable |
| 1420 |
Classes of financial instruments [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialInstrumentsAxis |
| 1421 |
Financial instruments, class [member] |
Member |
|
|
ifrs-full:ClassesOfFinancialInstrumentsMember |
| 1422 |
Performing Loans [member] |
Member |
|
|
ck0001087711:PerformingLoansMember |
| 1423 |
Early Arrear Loans [member] |
Member |
|
|
ck0001087711:EarlyArrearLoansMember |
| 1424 |
Non Performing Loans by Arrears [member] |
Member |
|
|
ck0001087711:NonPerformingLoansByArrearsMember |
| 1425 |
Non Performing Loans by Bankruptcy [member] |
Member |
|
|
ck0001087711:NonPerformingLoansByBankruptcyMember |
| 1426 |
Non Performing Loans by Maturity Default [member] |
Member |
|
|
ck0001087711:NonPerformingLoansByMaturityDefaultMember |
| 1427 |
Non-performing loans by forbearance [member] |
Member |
|
|
ck0001087711:NonPerformingLoansByForbearanceMember |
| 1428 |
Non Performing Loans by Properties in Possession [member] |
Member |
|
|
ck0001087711:NonPerformingLoansByPropertiesInPossessionMember |
| 1429 |
Classes of financial assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialAssetsAxis |
| 1430 |
Financial assets, class [member] |
Member |
|
|
ifrs-full:FinancialAssetsMember |
| 1431 |
Stage 1 [member] |
Member |
|
|
ck0001087711:StageOneMember |
| 1432 |
Stage 2 [member] |
Member |
|
|
ck0001087711:StageTwoMember |
| 1433 |
Stage 3 [member] |
Member |
|
|
ck0001087711:StageThreeMember |
| 1434 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 1435 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 1436 |
Mortgages [member] |
Member |
|
|
ifrs-full:MortgagesMember |
| 1437 |
Types of risks [axis] |
Axis |
|
|
ifrs-full:TypesOfRisksAxis |
| 1438 |
Risks [member] |
Member |
|
|
ifrs-full:TypesOfRisksMember |
| 1439 |
Credit risk [member] |
Member |
|
|
ifrs-full:CreditRiskMember |
| 1440 |
Past due status [axis] |
Axis |
|
|
ifrs-full:PastDueStatusAxis |
| 1441 |
Past due status [member] |
Member |
|
|
ifrs-full:PastDueStatusMember |
| 1442 |
Later Than 1 Month and Not Later Than 2 Months [member] |
Member |
|
|
ifrs-full:LaterThanOneMonthAndNotLaterThanTwoMonthsMember |
| 1443 |
Later Than 2 Months And Not Later Than 3 Months [member] |
Member |
|
|
ifrs-full:LaterThanTwoMonthsAndNotLaterThanThreeMonthsMember |
| 1444 |
Disclosure of credit risk exposure [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfCreditRiskExposureLineItems |
| 1445 |
Loans and advances to customers |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:LoansAndAdvancesToCustomers |
| 1446 |
Non performing loans |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:NonPerformingLoans |
| 1447 |
Impairment loss allowances |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:AllowanceAccountForCreditLossesOfFinancialAssets |
| 1448 |
Stage 2 ratio |
Concept (Percent) |
As Of |
|
ck0001087711:StageTwoRatio |
| 1449 |
Stage 3 ratio |
Concept (Percent) |
As Of |
|
ck0001087711:StageThreeRatio |
| 1450 |
Early arrears ratio |
Concept (Percent) |
As Of |
|
ck0001087711:LoansEarlyArrearsRatio |
| 1451 |
NPL ratio |
Concept (Percent) |
As Of |
|
ck0001087711:RatioOfNonPerformingLoans |
| 1452 |
1139 - Disclosure - Credit Risk - Summary of Residential Mortgages by Credit Performance (Parenthetical) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfResidentialMortgagesByCreditPerformanceParenthetical |
| 1453 |
Disclosure of credit risk exposure [table] |
Table |
* |
* |
ifrs-full:DisclosureOfCreditRiskExposureTable |
| 1454 |
Past due status [axis] |
Axis |
|
|
ifrs-full:PastDueStatusAxis |
| 1455 |
Past due status [member] |
Member |
|
|
ifrs-full:PastDueStatusMember |
| 1456 |
Later Than 1 day and Not Later Than 1 Month [member] |
Member |
|
|
ck0001087711:LaterThanOneDayAndNotLaterThanOneMonthMember |
| 1457 |
Disclosure of credit risk exposure [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfCreditRiskExposureLineItems |
| 1458 |
Non performing loans |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:NonPerformingLoans |
| 1459 |
1140 - Disclosure - Credit Risk - Summary of ECL Reconciliation (Residential Mortgages) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfECLReconciliationResidentialMortgages |
| 1460 |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [table] |
Table |
* |
* |
ifrs-full:DisclosureOfReconciliationOfChangesInLossAllowanceAndExplanationOfChangesInGrossCarryingAmountForFinancialInstrumentsTable |
| 1461 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 1462 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 1463 |
Residential mortgages [member] |
Member |
|
|
ck0001087711:ResidentialMortgagesMember |
| 1464 |
Method of assessment of expected credit losses [axis] |
Axis |
|
|
ifrs-full:MethodOfAssessmentOfExpectedCreditLossesAxis |
| 1465 |
Method of assessment of expected credit losses [member] |
Member |
|
|
ifrs-full:MethodOfAssessmentOfExpectedCreditLossesMember |
| 1466 |
Stage 1 ECL [member] |
Member |
|
|
ck0001087711:StageOneExpectedCreditLossMember |
| 1467 |
Stage 2 ECL [member] |
Member |
|
|
ck0001087711:StageTwoExpectedCreditLossMember |
| 1468 |
Stage 3 ECL [member] |
Member |
|
|
ck0001087711:StageThreeExpectedCreditLossMember |
| 1469 |
Total exposure [member] |
Member |
|
|
ck0001087711:TotalExposureMember |
| 1470 |
Expected credit loss [member] |
Member |
|
|
ck0001087711:ExpectedCreditLossMember |
| 1471 |
Classes of financial assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialAssetsAxis |
| 1472 |
Financial assets, class [member] |
Member |
|
|
ifrs-full:FinancialAssetsMember |
| 1473 |
Stage 1 [member] |
Member |
|
|
ck0001087711:StageOneMember |
| 1474 |
Stage 2 [member] |
Member |
|
|
ck0001087711:StageTwoMember |
| 1475 |
Stage 3 [member] |
Member |
|
|
ck0001087711:StageThreeMember |
| 1476 |
Type of measurement of expected credit losses [axis] |
Axis |
|
|
ifrs-full:TypeOfMeasurementOfExpectedCreditLossesAxis |
| 1477 |
Type of measurement of expected credit losses [member] |
Member |
|
|
ifrs-full:TypeOfMeasurementOfExpectedCreditLossesMember |
| 1478 |
Subject to 12-month ECL [member] |
Member |
|
|
ifrs-full:TwelvemonthExpectedCreditLossesMember |
| 1479 |
Subject to Lifetime ECL [member] |
Member |
|
|
ifrs-full:LifetimeExpectedCreditLossesMember |
| 1480 |
Credit impairment of financial instruments [axis] |
Axis |
|
|
ifrs-full:CreditImpairmentOfFinancialInstrumentsAxis |
| 1481 |
Credit impairment of financial instruments [member] |
Member |
|
|
ifrs-full:CreditImpairmentOfFinancialInstrumentsMember |
| 1482 |
Financial instruments not credit-impaired [member] |
Member |
|
|
ifrs-full:FinancialInstrumentsNotCreditimpairedMember |
| 1483 |
Financial instruments credit-impaired [member] |
Member |
|
|
ifrs-full:FinancialInstrumentsCreditimpairedMember |
| 1484 |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfReconciliationOfChangesInLossAllowanceAndExplanationOfChangesInGrossCarryingAmountForFinancialInstrumentsLineItems |
| 1485 |
Beginning balance |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:TotalExpectedCreditLosses |
| 1486 |
Beginning balance |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssets |
| 1487 |
Change in economic scenarios |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:IncreaseDecreaseThroughChangesInEconomicInputs |
| 1488 |
Changes to model |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:IncreaseDecreaseThroughChangesInModelsOrRiskParametersFinancialAssets |
| 1489 |
Transfer to lifetime ECL (not-credit impaired) |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:IncreaseDecreaseThroughTransfersToLifetimeEclNotCreditImpairedFinancialAssets |
| 1490 |
Transfer to credit impaired |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:IncreaseDecreaseThroughTransfersToCreditImpairedFinancialAssets |
| 1491 |
Transfer to 12-monthECL |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:IncreaseDecreaseThroughTransfersToTwelveMonthEclFinancialAssets |
| 1492 |
Transfer from credit impaired |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:IncreaseDecreaseThroughTransfersFromCreditImpairedFinancialAssets |
| 1493 |
Transfers of financial instruments |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:IncreaseDecreaseThroughTransfersFinancialAssets |
| 1494 |
Net remeasurement of ECL on stage transfer |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:IncreaseDecreaseThroughNetRemeasurementOfECLOnStageTransfer |
| 1495 |
New assets originated or purchased |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:IncreaseThroughOriginationOrPurchaseFinancialAssets |
| 1496 |
Other |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:IncreaseDecreaseThroughOtherMovementsFinancialAssets |
| 1497 |
Assets derecognised - closed good |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:DecreaseThroughDerecognitionFinancialAssets |
| 1498 |
Assets derecognised - written off |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:DecreaseThroughWriteoffFinancialAssets |
| 1499 |
Ending balance |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:TotalExpectedCreditLosses |
| 1500 |
Ending balance |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssets |
| 1501 |
Net movement in the year |
Concept (Monetary) |
As Of |
|
ck0001087711:IncreaseDecreaseInTotalExpectedCreditLosses |
| 1502 |
Net movement in the year |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:IncreaseDecreaseInTotalFinancialAssets |
| 1503 |
Charge/(release) to the Income Statement |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:GrossImpairmentLossIncomeStatementCharge |
| 1504 |
Recoveries net of collection costs |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:FinancialAssetsPostWriteoffRecoveries |
| 1505 |
Income statement charge/(release) for the year |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:ImpairmentLossOnFinancialAssets |
| 1506 |
1141 - Disclosure - Credit Risk - Summary of Modification of Loan Terms (Residential Mortgages) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfModificationOfLoanTermsResidentialMortgages |
| 1507 |
Disclosure of credit risk exposure [table] |
Table |
* |
* |
ifrs-full:DisclosureOfCreditRiskExposureTable |
| 1508 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 1509 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 1510 |
Mortgages [member] |
Member |
|
|
ifrs-full:MortgagesMember |
| 1511 |
Disclosure of credit risk exposure [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfCreditRiskExposureLineItems |
| 1512 |
Amortised cost before modification |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:FinancialAssetsWithContractualCashFlowsModifiedDuringReportingPeriodWhileLossAllowanceMeasuredAtLifetimeExpectedCreditLossesAmortisedCostBeforeModification |
| 1513 |
Net modification loss |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:FinancialAssetsWithContractualCashFlowsModifiedDuringReportingPeriodWhileLossAllowanceMeasuredAtLifetimeExpectedCreditLossesModificationGainLoss |
| 1514 |
Gross carrying amount of financial assets for which the ECL allowance has changed to 12-month measurement during the year |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssetsWithModifiedContractualCashFlowsWhileLossAllowanceMeasuredAtLifetimeExpectedCreditLossesForWhichLossAllowanceChangedDuringReportingPeriodTo12monthExpectedCreditLossesGrossCarryingAmount |
| 1515 |
1142 - Disclosure - Credit Risk - Summary of Residential Mortgages by Forbearance Applied (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfResidentialMortgagesByForbearanceApplied |
| 1516 |
Disclosure of credit risk exposure [table] |
Table |
* |
* |
ifrs-full:DisclosureOfCreditRiskExposureTable |
| 1517 |
Classes of financial assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialAssetsAxis |
| 1518 |
Financial assets, class [member] |
Member |
|
|
ifrs-full:FinancialAssetsMember |
| 1519 |
Stage 2 [member] |
Member |
|
|
ck0001087711:StageTwoMember |
| 1520 |
Stage 3 [member] |
Member |
|
|
ck0001087711:StageThreeMember |
| 1521 |
Forbearance in Arrears [member] |
Member |
|
|
ck0001087711:ForbearanceInArrearsMember |
| 1522 |
Performing [member] |
Member |
|
|
ck0001087711:PerformingForbearanceMember |
| 1523 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 1524 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 1525 |
Mortgages [member] |
Member |
|
|
ifrs-full:MortgagesMember |
| 1526 |
Disclosure of credit risk exposure [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfCreditRiskExposureLineItems |
| 1527 |
Capitalisation |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:LoansCapitalisationForbearance |
| 1528 |
Term extension |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:LoansTermExtensionForbearance |
| 1529 |
Interest-only |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:LoansInterestOnlyForbearance |
| 1530 |
Total |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:LoansForbearance |
| 1531 |
Impairment loss allowances |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:AllowanceAccountForCreditLossesOfLoansForbearance |
| 1532 |
Loans capitalisation forbearance Percentage |
Concept (Percent) |
As Of |
|
ck0001087711:LoansCapitalisationForbearancePercentage |
| 1533 |
Loans term extension forbearance percentage |
Concept (Percent) |
As Of |
|
ck0001087711:LoansTermExtensionForbearancePercentage |
| 1534 |
Loans interest only forbearance percentage |
Concept (Percent) |
As Of |
|
ck0001087711:LoansInterestOnlyForbearancePercentage |
| 1535 |
Loans forbearance percentage |
Concept (Percent) |
As Of |
|
ck0001087711:LoansForbearancePercentage |
| 1536 |
1143 - Disclosure - Credit Risk - Summary of Residential Mortgages Portfolios of Particular Interest by Credit Performance (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfResidentialMortgagesPortfoliosOfParticularInterestByCreditPerformance |
| 1537 |
Disclosure of credit risk exposure [table] |
Table |
* |
* |
ifrs-full:DisclosureOfCreditRiskExposureTable |
| 1538 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 1539 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 1540 |
Mortgages [member] |
Member |
|
|
ifrs-full:MortgagesMember |
| 1541 |
Classes of financial assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialAssetsAxis |
| 1542 |
Financial assets, class [member] |
Member |
|
|
ifrs-full:FinancialAssetsMember |
| 1543 |
Stage 1 [member] |
Member |
|
|
ck0001087711:StageOneMember |
| 1544 |
Stage 2 [member] |
Member |
|
|
ck0001087711:StageTwoMember |
| 1545 |
Stage 3 [member] |
Member |
|
|
ck0001087711:StageThreeMember |
| 1546 |
Past due status [axis] |
Axis |
|
|
ifrs-full:PastDueStatusAxis |
| 1547 |
Past due status [member] |
Member |
|
|
ifrs-full:PastDueStatusMember |
| 1548 |
Later Than 1 Month and Not Later Than 2 Months [member] |
Member |
|
|
ifrs-full:LaterThanOneMonthAndNotLaterThanTwoMonthsMember |
| 1549 |
Later Than 2 Months And Not Later Than 3 Months [member] |
Member |
|
|
ifrs-full:LaterThanTwoMonthsAndNotLaterThanThreeMonthsMember |
| 1550 |
Classes of financial instruments [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialInstrumentsAxis |
| 1551 |
Financial instruments, class [member] |
Member |
|
|
ifrs-full:ClassesOfFinancialInstrumentsMember |
| 1552 |
Performing Loans [member] |
Member |
|
|
ck0001087711:PerformingLoansMember |
| 1553 |
Early Arrear Loans [member] |
Member |
|
|
ck0001087711:EarlyArrearLoansMember |
| 1554 |
Products and services [axis] |
Axis |
|
|
ifrs-full:ProductsAndServicesAxis |
| 1555 |
Products and services [member] |
Member |
|
|
ifrs-full:ProductsAndServicesMember |
| 1556 |
Interest Only Loan [member] |
Member |
|
|
ck0001087711:InterestOnlyLoanMember |
| 1557 |
Part Interest Only Part Repayment [member] |
Member |
|
|
ck0001087711:PartInterestOnlyPartRepaymentMember |
| 1558 |
Flexible Interest Loan [member] |
Member |
|
|
ck0001087711:FlexibleInterestLoanMember |
| 1559 |
Loan To Value Greater Than 100% Loan [member] |
Member |
|
|
ck0001087711:LoanToValueGreaterThanHundredPercentageLoanMember |
| 1560 |
Buy To Let Loan [member] |
Member |
|
|
ck0001087711:BuyToLetLoanMember |
| 1561 |
Other [member] |
Member |
|
|
ck0001087711:OtherPortfolioMember |
| 1562 |
Disclosure of credit risk exposure [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfCreditRiskExposureLineItems |
| 1563 |
Loans and advances to customers |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:LoansAndAdvancesToCustomers |
| 1564 |
Stage 3 ratio |
Concept (Percent) |
As Of |
|
ck0001087711:StageThreeRatio |
| 1565 |
NPLs |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:NonPerformingLoans |
| 1566 |
NPL ratio |
Concept (Percent) |
As Of |
|
ck0001087711:RatioOfNonPerformingLoans |
| 1567 |
PIPs |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:NonPerformingLoansByPropertiesInPossession |
| 1568 |
1144 - Disclosure - Credit Risk - Summary of Residential Mortgages Portfolios of Particular Interest by Credit Performance (Parenthetical) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfResidentialMortgagesPortfoliosOfParticularInterestByCreditPerformanceParenthetical |
| 1569 |
Disclosure of credit risk exposure [table] |
Table |
* |
* |
ifrs-full:DisclosureOfCreditRiskExposureTable |
| 1570 |
Products and services [axis] |
Axis |
|
|
ifrs-full:ProductsAndServicesAxis |
| 1571 |
Products and services [member] |
Member |
|
|
ifrs-full:ProductsAndServicesMember |
| 1572 |
Part Interest Only Part Repayment [member] |
Member |
|
|
ck0001087711:PartInterestOnlyPartRepaymentMember |
| 1573 |
Disclosure of credit risk exposure [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfCreditRiskExposureLineItems |
| 1574 |
Mortgage loan including interest-only part |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:InterestOnlyPartOfPartInterestOnlyPartRepaymentProducts |
| 1575 |
1145 - Disclosure - Credit Risk - Summary of Residential Mortgages Portfolios of Particular Interest by Forbearance Applied (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfResidentialMortgagesPortfoliosOfParticularInterestByForbearanceApplied |
| 1576 |
Disclosure of credit risk exposure [table] |
Table |
* |
* |
ifrs-full:DisclosureOfCreditRiskExposureTable |
| 1577 |
Classes of financial instruments [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialInstrumentsAxis |
| 1578 |
Financial instruments, class [member] |
Member |
|
|
ifrs-full:ClassesOfFinancialInstrumentsMember |
| 1579 |
Interest Only Loan [member] |
Member |
|
|
ck0001087711:InterestOnlyLoanMember |
| 1580 |
Flexible Interest Loan [member] |
Member |
|
|
ck0001087711:FlexibleInterestLoanMember |
| 1581 |
Loan To Value Greater Than 100% Loan [member] |
Member |
|
|
ck0001087711:LoanToValueGreaterThanHundredPercentageLoanMember |
| 1582 |
Buy To Let Loan [member] |
Member |
|
|
ck0001087711:BuyToLetLoanMember |
| 1583 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 1584 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 1585 |
Mortgages [member] |
Member |
|
|
ifrs-full:MortgagesMember |
| 1586 |
Classes of financial assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialAssetsAxis |
| 1587 |
Financial assets, class [member] |
Member |
|
|
ifrs-full:FinancialAssetsMember |
| 1588 |
Stage 2 [member] |
Member |
|
|
ck0001087711:StageTwoMember |
| 1589 |
Stage 3 [member] |
Member |
|
|
ck0001087711:StageThreeMember |
| 1590 |
Disclosure of credit risk exposure [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfCreditRiskExposureLineItems |
| 1591 |
Total value |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:LoansForbearance |
| 1592 |
1146 - Disclosure - Credit Risk - Summary of Consumer (Auto) Finance and Other Unsecured Lending by Credit Performance (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfConsumerAutoFinanceAndOtherUnsecuredLendingByCreditPerformance |
| 1593 |
Disclosure of credit risk exposure [table] |
Table |
* |
* |
ifrs-full:DisclosureOfCreditRiskExposureTable |
| 1594 |
Products and services [axis] |
Axis |
|
|
ifrs-full:ProductsAndServicesAxis |
| 1595 |
Products and services [member] |
Member |
|
|
ifrs-full:ProductsAndServicesMember |
| 1596 |
Consumer (auto) finance [member] |
Member |
|
|
ifrs-full:ConsumerLoansMember |
| 1597 |
Personal loans [member] |
Member |
|
|
ck0001087711:PersonalLoansMember |
| 1598 |
Credit Card [member] |
Member |
|
|
ck0001087711:CreditCardMember |
| 1599 |
Overdrafts [member] |
Member |
|
|
ck0001087711:OverdraftsMember |
| 1600 |
Other unsecured advances [member] |
Member |
|
|
ck0001087711:OtherUnsecuredLoansMember |
| 1601 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 1602 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 1603 |
Consumer finance and unsecured lending [member] |
Member |
|
|
ck0001087711:ConsumerFinanceAndUnsecuredLendingMember |
| 1604 |
Classes of financial instruments [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialInstrumentsAxis |
| 1605 |
Financial instruments, class [member] |
Member |
|
|
ifrs-full:ClassesOfFinancialInstrumentsMember |
| 1606 |
Performing Loans [member] |
Member |
|
|
ck0001087711:PerformingLoansMember |
| 1607 |
Early Arrear Loans [member] |
Member |
|
|
ck0001087711:EarlyArrearLoansMember |
| 1608 |
Classes of financial assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialAssetsAxis |
| 1609 |
Financial assets, class [member] |
Member |
|
|
ifrs-full:FinancialAssetsMember |
| 1610 |
Stage 1 [member] |
Member |
|
|
ck0001087711:StageOneMember |
| 1611 |
Stage 2 [member] |
Member |
|
|
ck0001087711:StageTwoMember |
| 1612 |
Stage 3 [member] |
Member |
|
|
ck0001087711:StageThreeMember |
| 1613 |
Disclosure of credit risk exposure [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfCreditRiskExposureLineItems |
| 1614 |
Loans and advances to customers |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:LoansAndAdvancesToCustomers |
| 1615 |
NPL |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:NonPerformingLoans |
| 1616 |
Loss allowances |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:AllowanceAccountForCreditLossesOfFinancialAssets |
| 1617 |
NPL ratio |
Concept (Percent) |
As Of |
|
ck0001087711:RatioOfNonPerformingLoans |
| 1618 |
Stage 3 ratio |
Concept (Percent) |
As Of |
|
ck0001087711:StageThreeRatio |
| 1619 |
Gross write-offs |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:GrossWriteoffs |
| 1620 |
1147 - Disclosure - Credit Risk - Summary of Modification of Loan Terms ( Consumer (Auto) Finance and Other Unsecured Lending) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfModificationOfLoanTermsConsumerAutoFinanceAndOtherUnsecuredLending |
| 1621 |
Disclosure of credit risk exposure [table] |
Table |
* |
* |
ifrs-full:DisclosureOfCreditRiskExposureTable |
| 1622 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 1623 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 1624 |
Consumer finance and unsecured lending [member] |
Member |
|
|
ck0001087711:ConsumerFinanceAndUnsecuredLendingMember |
| 1625 |
Products and services [axis] |
Axis |
|
|
ifrs-full:ProductsAndServicesAxis |
| 1626 |
Products and services [member] |
Member |
|
|
ifrs-full:ProductsAndServicesMember |
| 1627 |
Credit cards [member] |
Member |
|
|
ck0001087711:CreditCardsMember |
| 1628 |
Overdrafts [member] |
Member |
|
|
ck0001087711:OverdraftsMember |
| 1629 |
Disclosure of credit risk exposure [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfCreditRiskExposureLineItems |
| 1630 |
Amortised cost before modification |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:FinancialAssetsWithContractualCashFlowsModifiedDuringReportingPeriodWhileLossAllowanceMeasuredAtLifetimeExpectedCreditLossesAmortisedCostBeforeModification |
| 1631 |
Net modification loss |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:FinancialAssetsWithContractualCashFlowsModifiedDuringReportingPeriodWhileLossAllowanceMeasuredAtLifetimeExpectedCreditLossesModificationGainLoss |
| 1632 |
Gross carrying amount of financial assets for which the ECL allowance has changed to 12-month measurement during the year |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssetsWithModifiedContractualCashFlowsWhileLossAllowanceMeasuredAtLifetimeExpectedCreditLossesForWhichLossAllowanceChangedDuringReportingPeriodTo12monthExpectedCreditLossesGrossCarryingAmount |
| 1633 |
1148 - Disclosure - Credit Risk - Summary of Consumer (Auto) Finance and Other Unsecured Lending by Forbearance (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfConsumerAutoFinanceAndOtherUnsecuredLendingByForbearance |
| 1634 |
Disclosure of credit risk exposure [table] |
Table |
* |
* |
ifrs-full:DisclosureOfCreditRiskExposureTable |
| 1635 |
Products and services [axis] |
Axis |
|
|
ifrs-full:ProductsAndServicesAxis |
| 1636 |
Products and services [member] |
Member |
|
|
ifrs-full:ProductsAndServicesMember |
| 1637 |
Personal loans [member] |
Member |
|
|
ck0001087711:PersonalLoansMember |
| 1638 |
Credit cards [member] |
Member |
|
|
ck0001087711:CreditCardsMember |
| 1639 |
Overdrafts [member] |
Member |
|
|
ck0001087711:OverdraftsMember |
| 1640 |
Total other unsecured [member] |
Member |
|
|
ck0001087711:TotalOtherUnsecuredMember |
| 1641 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 1642 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 1643 |
Consumer finance and unsecured lending [member] |
Member |
|
|
ck0001087711:ConsumerFinanceAndUnsecuredLendingMember |
| 1644 |
Classes of financial assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialAssetsAxis |
| 1645 |
Financial assets, class [member] |
Member |
|
|
ifrs-full:FinancialAssetsMember |
| 1646 |
Stage 2 [member] |
Member |
|
|
ck0001087711:StageTwoMember |
| 1647 |
Stage 3 [member] |
Member |
|
|
ck0001087711:StageThreeMember |
| 1648 |
Disclosure of credit risk exposure [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfCreditRiskExposureLineItems |
| 1649 |
Forbearance |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:LoansForbearance |
| 1650 |
1149 - Disclosure - Credit Risk - Summary of Business Banking by Credit Performance (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfBusinessBankingByCreditPerformance |
| 1651 |
Disclosure of credit risk exposure [table] |
Table |
* |
* |
ifrs-full:DisclosureOfCreditRiskExposureTable |
| 1652 |
Types of risks [axis] |
Axis |
|
|
ifrs-full:TypesOfRisksAxis |
| 1653 |
Risks [member] |
Member |
|
|
ifrs-full:TypesOfRisksMember |
| 1654 |
Credit risk [member] |
Member |
|
|
ifrs-full:CreditRiskMember |
| 1655 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 1656 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 1657 |
Business Banking [member] |
Member |
|
|
ck0001087711:BusinessBankingMember |
| 1658 |
Classes of financial assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialAssetsAxis |
| 1659 |
Financial assets, class [member] |
Member |
|
|
ifrs-full:FinancialAssetsMember |
| 1660 |
Stage 1 [member] |
Member |
|
|
ck0001087711:StageOneMember |
| 1661 |
Stage 2 [member] |
Member |
|
|
ck0001087711:StageTwoMember |
| 1662 |
Stage 3 [member] |
Member |
|
|
ck0001087711:StageThreeMember |
| 1663 |
Classes of financial instruments [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialInstrumentsAxis |
| 1664 |
Financial instruments, class [member] |
Member |
|
|
ifrs-full:ClassesOfFinancialInstrumentsMember |
| 1665 |
Performing Loans [member] |
Member |
|
|
ck0001087711:PerformingLoansMember |
| 1666 |
Early Arrear Loans [member] |
Member |
|
|
ck0001087711:EarlyArrearLoansMember |
| 1667 |
Non performing loans [member] |
Member |
|
|
ck0001087711:NonPerformingLoansMember |
| 1668 |
Disclosure of credit risk exposure [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfCreditRiskExposureLineItems |
| 1669 |
Loans and advances to customers |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:LoansAndAdvancesToCustomers |
| 1670 |
Loss allowances |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:AllowanceAccountForCreditLossesOfFinancialAssets |
| 1671 |
Stage 3 ratio |
Concept (Percent) |
As Of |
|
ck0001087711:StageThreeRatio |
| 1672 |
NPL ratio |
Concept (Percent) |
As Of |
|
ck0001087711:RatioOfNonPerformingLoans |
| 1673 |
Gross write offs |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:GrossWriteoffs |
| 1674 |
1150 - Disclosure - Credit Risk - Summary of Modification of Loan Terms (Business Banking) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfModificationOfLoanTermsBusinessBanking |
| 1675 |
Disclosure of credit risk exposure [table] |
Table |
* |
* |
ifrs-full:DisclosureOfCreditRiskExposureTable |
| 1676 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 1677 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 1678 |
Business Banking [member] |
Member |
|
|
ck0001087711:BusinessBankingMember |
| 1679 |
Disclosure of credit risk exposure [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfCreditRiskExposureLineItems |
| 1680 |
Amortised cost before modification |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:FinancialAssetsWithContractualCashFlowsModifiedDuringReportingPeriodWhileLossAllowanceMeasuredAtLifetimeExpectedCreditLossesAmortisedCostBeforeModification |
| 1681 |
Net modification loss |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:FinancialAssetsWithContractualCashFlowsModifiedDuringReportingPeriodWhileLossAllowanceMeasuredAtLifetimeExpectedCreditLossesModificationGainLoss |
| 1682 |
Gross carrying amount of financial assets for which the ECL allowance has changed to 12-month measurement during the year |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssetsWithModifiedContractualCashFlowsWhileLossAllowanceMeasuredAtLifetimeExpectedCreditLossesForWhichLossAllowanceChangedDuringReportingPeriodTo12monthExpectedCreditLossesGrossCarryingAmount |
| 1683 |
1151 - Disclosure - Credit Risk - Summary of Business Banking by Forbearance (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfBusinessBankingByForbearance |
| 1684 |
Disclosure of credit risk exposure [table] |
Table |
* |
* |
ifrs-full:DisclosureOfCreditRiskExposureTable |
| 1685 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 1686 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 1687 |
Business Banking [member] |
Member |
|
|
ck0001087711:BusinessBankingMember |
| 1688 |
Classes of financial assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialAssetsAxis |
| 1689 |
Financial assets, class [member] |
Member |
|
|
ifrs-full:FinancialAssetsMember |
| 1690 |
Stage 2 [member] |
Member |
|
|
ck0001087711:StageTwoMember |
| 1691 |
Stage 3 [member] |
Member |
|
|
ck0001087711:StageThreeMember |
| 1692 |
Disclosure of credit risk exposure [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfCreditRiskExposureLineItems |
| 1693 |
Total value |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:LoansForbearance |
| 1694 |
1152 - Disclosure - Credit Risk - Summary of ECL Reconciliation For Other Business Segments (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfECLReconciliationForOtherBusinessSegments |
| 1695 |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [table] |
Table |
* |
* |
ifrs-full:DisclosureOfReconciliationOfChangesInLossAllowanceAndExplanationOfChangesInGrossCarryingAmountForFinancialInstrumentsTable |
| 1696 |
Credit impairment of financial instruments [axis] |
Axis |
|
|
ifrs-full:CreditImpairmentOfFinancialInstrumentsAxis |
| 1697 |
Credit impairment of financial instruments [member] |
Member |
|
|
ifrs-full:CreditImpairmentOfFinancialInstrumentsMember |
| 1698 |
Financial instruments not credit-impaired [member] |
Member |
|
|
ifrs-full:FinancialInstrumentsNotCreditimpairedMember |
| 1699 |
Financial instruments credit-impaired [member] |
Member |
|
|
ifrs-full:FinancialInstrumentsCreditimpairedMember |
| 1700 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 1701 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 1702 |
Corporate and commercial banking [member] |
Member |
|
|
ck0001087711:CorporateAndCommercialBankingMember |
| 1703 |
Corporate and investment banking [member] |
Member |
|
|
ck0001087711:CorporateAndInvestmentBankingMember |
| 1704 |
Corporate centre [member] |
Member |
|
|
ck0001087711:CorporateCentreMember |
| 1705 |
Method of assessment of expected credit losses [axis] |
Axis |
|
|
ifrs-full:MethodOfAssessmentOfExpectedCreditLossesAxis |
| 1706 |
Method of assessment of expected credit losses [member] |
Member |
|
|
ifrs-full:MethodOfAssessmentOfExpectedCreditLossesMember |
| 1707 |
Stage 1 ECL [member] |
Member |
|
|
ck0001087711:StageOneExpectedCreditLossMember |
| 1708 |
Stage 2 ECL [member] |
Member |
|
|
ck0001087711:StageTwoExpectedCreditLossMember |
| 1709 |
Stage 3 ECL [member] |
Member |
|
|
ck0001087711:StageThreeExpectedCreditLossMember |
| 1710 |
Total exposure [member] |
Member |
|
|
ck0001087711:TotalExposureMember |
| 1711 |
Expected credit loss [member] |
Member |
|
|
ck0001087711:ExpectedCreditLossMember |
| 1712 |
Type of measurement of expected credit losses [axis] |
Axis |
|
|
ifrs-full:TypeOfMeasurementOfExpectedCreditLossesAxis |
| 1713 |
Type of measurement of expected credit losses [member] |
Member |
|
|
ifrs-full:TypeOfMeasurementOfExpectedCreditLossesMember |
| 1714 |
Subject to 12-month ECL [member] |
Member |
|
|
ifrs-full:TwelvemonthExpectedCreditLossesMember |
| 1715 |
Subject to Lifetime ECL [member] |
Member |
|
|
ifrs-full:LifetimeExpectedCreditLossesMember |
| 1716 |
Classes of financial assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialAssetsAxis |
| 1717 |
Financial assets, class [member] |
Member |
|
|
ifrs-full:FinancialAssetsMember |
| 1718 |
Stage 1 [member] |
Member |
|
|
ck0001087711:StageOneMember |
| 1719 |
Stage 2 [member] |
Member |
|
|
ck0001087711:StageTwoMember |
| 1720 |
Stage 3 [member] |
Member |
|
|
ck0001087711:StageThreeMember |
| 1721 |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfReconciliationOfChangesInLossAllowanceAndExplanationOfChangesInGrossCarryingAmountForFinancialInstrumentsLineItems |
| 1722 |
Beginning balance |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:TotalExpectedCreditLosses |
| 1723 |
Beginning balance |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssets |
| 1724 |
Change in economic scenarios |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:IncreaseDecreaseThroughChangesInEconomicInputs |
| 1725 |
Changes to model |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:IncreaseDecreaseThroughChangesInModelsOrRiskParametersFinancialAssets |
| 1726 |
Transfer to lifetime ECL (not-credit impaired) |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:IncreaseDecreaseThroughTransfersToLifetimeEclNotCreditImpairedFinancialAssets |
| 1727 |
Transfer to credit impaired |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:IncreaseDecreaseThroughTransfersToCreditImpairedFinancialAssets |
| 1728 |
Transfer to 12-month ECL |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:IncreaseDecreaseThroughTransfersToTwelveMonthEclFinancialAssets |
| 1729 |
Transfer from credit impaired |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:IncreaseDecreaseThroughTransfersFromCreditImpairedFinancialAssets |
| 1730 |
Transfers of financial instruments |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:IncreaseDecreaseThroughTransfersFinancialAssets |
| 1731 |
Net remeasurement of ECL on stage transfer |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:IncreaseDecreaseThroughNetRemeasurementOfECLOnStageTransfer |
| 1732 |
New assets originated or purchased |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:IncreaseThroughOriginationOrPurchaseFinancialAssets |
| 1733 |
Other |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:IncreaseDecreaseThroughOtherMovementsFinancialAssets |
| 1734 |
Assets derecognised - closed good |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:DecreaseThroughDerecognitionFinancialAssets |
| 1735 |
Assets derecognised - written off |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:DecreaseThroughWriteoffFinancialAssets |
| 1736 |
Ending balance |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:TotalExpectedCreditLosses |
| 1737 |
Ending balance |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssets |
| 1738 |
Net movement in the year |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:IncreaseDecreaseInTotalFinancialAssets |
| 1739 |
Net movement in the year |
Concept (Monetary) |
As Of |
|
ck0001087711:IncreaseDecreaseInTotalExpectedCreditLosses |
| 1740 |
Charge/(release) to the Income Statement |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:GrossImpairmentLossIncomeStatementCharge |
| 1741 |
Recoveries net of collection costs |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:FinancialAssetsPostWriteoffRecoveries |
| 1742 |
Income statement charge/(release) for the year |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:ImpairmentLossOnFinancialAssets |
| 1743 |
1153 - Disclosure - Credit Risk - Summary of Other Segments Exposures by Credit Rating (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfOtherSegmentsExposuresByCreditRating |
| 1744 |
Disclosure of credit risk exposure [table] |
Table |
* |
* |
ifrs-full:DisclosureOfCreditRiskExposureTable |
| 1745 |
Internal credit grades [axis] |
Axis |
|
|
ifrs-full:InternalCreditGradesAxis |
| 1746 |
Entity's total for internal credit grades [member] |
Member |
|
|
ifrs-full:EntitysTotalForInternalCreditGradesMember |
| 1747 |
Internal grade 9 [member] |
Member |
|
|
ck0001087711:InternalGradeNineMember |
| 1748 |
Internal grade 8 [member] |
Member |
|
|
ck0001087711:InternalGradeEightMember |
| 1749 |
Internal grade 7 [member] |
Member |
|
|
ck0001087711:InternalGradeSevenMember |
| 1750 |
Internal grade 6 [member] |
Member |
|
|
ck0001087711:InternalGradeSixMember |
| 1751 |
Internal grade 5 [member] |
Member |
|
|
ck0001087711:InternalGradeFiveMember |
| 1752 |
Internal grade 4 [member] |
Member |
|
|
ck0001087711:InternalGradeFourMember |
| 1753 |
Internal grade 3 to 1 [member] |
Member |
|
|
ck0001087711:InternalGradeThreeToOneMember |
| 1754 |
Other [member] |
Member |
|
|
ck0001087711:OtherInternalGradeMember |
| 1755 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 1756 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 1757 |
Corporate and investment banking [member] |
Member |
|
|
ck0001087711:CorporateAndInvestmentBankingMember |
| 1758 |
Corporate centre [member] |
Member |
|
|
ck0001087711:CorporateCentreMember |
| 1759 |
Corporate and commercial banking [member] |
Member |
|
|
ck0001087711:CorporateAndCommercialBankingMember |
| 1760 |
Classes of financial instruments [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialInstrumentsAxis |
| 1761 |
Financial instruments, class [member] |
Member |
|
|
ifrs-full:ClassesOfFinancialInstrumentsMember |
| 1762 |
SME and Mid Corporate [member] |
Member |
|
|
ck0001087711:SMEAndMidCorporateMember |
| 1763 |
Commercial Real Estate [member] |
Member |
|
|
ck0001087711:CommercialRealEstate1Member |
| 1764 |
Social Housing [member] |
Member |
|
|
ck0001087711:SocialHousingMember |
| 1765 |
Sovereign And Supranational [member] |
Member |
|
|
ck0001087711:SovereignAndSupranationalMember |
| 1766 |
Large Corporate [member] |
Member |
|
|
ck0001087711:LargeCorporateMember |
| 1767 |
Financial Institutions [member] |
Member |
|
|
ck0001087711:FinancialInstitutionsMember |
| 1768 |
Structured Products [member] |
Member |
|
|
ck0001087711:StructuredProductsMember |
| 1769 |
Derivative Financial Instruments [member] |
Member |
|
|
ifrs-full:DerivativesMember |
| 1770 |
Legacy Portfolios in Run-Off [member] |
Member |
|
|
ck0001087711:LegacyPortfoliosInRunoffMember |
| 1771 |
Crown dependency branch [member] |
Member |
|
|
ck0001087711:CrownDependencyBranchMember |
| 1772 |
Classes of financial assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialAssetsAxis |
| 1773 |
Financial assets, class [member] |
Member |
|
|
ifrs-full:FinancialAssetsMember |
| 1774 |
Stage 1 [member] |
Member |
|
|
ck0001087711:StageOneMember |
| 1775 |
Stage 2 [member] |
Member |
|
|
ck0001087711:StageTwoMember |
| 1776 |
Stage 3 [member] |
Member |
|
|
ck0001087711:StageThreeMember |
| 1777 |
Disclosure of credit risk exposure [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfCreditRiskExposureLineItems |
| 1778 |
Maximum exposure to credit risk |
Concept (Monetary) |
As Of |
|
ifrs-full:MaximumExposureToCreditRisk |
| 1779 |
1154 - Disclosure - Credit Risk - Summary of Other Segments Exposures by Geographical Distribution (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfOtherSegmentsExposuresByGeographicalDistribution |
| 1780 |
Disclosure of credit risk exposure [table] |
Table |
* |
* |
ifrs-full:DisclosureOfCreditRiskExposureTable |
| 1781 |
Geographical areas [axis] |
Axis |
|
|
ifrs-full:GeographicalAreasAxis |
| 1782 |
Geographical areas [member] |
Member |
|
|
ifrs-full:GeographicalAreasMember |
| 1783 |
UK [member] |
Member |
|
|
country:GB |
| 1784 |
Europe [member] |
Member |
|
|
ck0001087711:Europe1Member |
| 1785 |
US [member] |
Member |
|
|
country:US |
| 1786 |
Rest Of World [member] |
Member |
|
|
ck0001087711:RestOfWorldMember |
| 1787 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 1788 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 1789 |
Corporate and commercial banking [member] |
Member |
|
|
ck0001087711:CorporateAndCommercialBankingMember |
| 1790 |
Corporate and investment banking [member] |
Member |
|
|
ck0001087711:CorporateAndInvestmentBankingMember |
| 1791 |
Corporate centre [member] |
Member |
|
|
ck0001087711:CorporateCentreMember |
| 1792 |
Classes of financial instruments [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialInstrumentsAxis |
| 1793 |
Financial instruments, class [member] |
Member |
|
|
ifrs-full:ClassesOfFinancialInstrumentsMember |
| 1794 |
SME and Mid Corporate [member] |
Member |
|
|
ck0001087711:SMEAndMidCorporateMember |
| 1795 |
Commercial Real Estate [member] |
Member |
|
|
ck0001087711:CommercialRealEstate1Member |
| 1796 |
Social Housing [member] |
Member |
|
|
ck0001087711:SocialHousingMember |
| 1797 |
Sovereign And Supranational [member] |
Member |
|
|
ck0001087711:SovereignAndSupranationalMember |
| 1798 |
Large Corporate [member] |
Member |
|
|
ck0001087711:LargeCorporateMember |
| 1799 |
Financial Institutions [member] |
Member |
|
|
ck0001087711:FinancialInstitutionsMember |
| 1800 |
Structured Products [member] |
Member |
|
|
ck0001087711:StructuredProductsMember |
| 1801 |
Derivative Financial Instruments [member] |
Member |
|
|
ifrs-full:DerivativesMember |
| 1802 |
Legacy Portfolios in Run-Off [member] |
Member |
|
|
ck0001087711:LegacyPortfoliosInRunoffMember |
| 1803 |
Crown dependency branch [member] |
Member |
|
|
ck0001087711:CrownDependencyBranchMember |
| 1804 |
Disclosure of credit risk exposure [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfCreditRiskExposureLineItems |
| 1805 |
Maximum exposure to credit risk |
Concept (Monetary) |
As Of |
|
ifrs-full:MaximumExposureToCreditRisk |
| 1806 |
1155 - Disclosure - Credit Risk - Summary of Other Segments Exposures by Credit Performance (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfOtherSegmentsExposuresByCreditPerformance |
| 1807 |
Disclosure of credit risk exposure [table] |
Table |
* |
* |
ifrs-full:DisclosureOfCreditRiskExposureTable |
| 1808 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 1809 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 1810 |
Corporate and commercial banking [member] |
Member |
|
|
ck0001087711:CorporateAndCommercialBankingMember |
| 1811 |
Corporate and investment banking [member] |
Member |
|
|
ck0001087711:CorporateAndInvestmentBankingMember |
| 1812 |
Corporate centre [member] |
Member |
|
|
ck0001087711:CorporateCentreMember |
| 1813 |
Classes of financial instruments [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialInstrumentsAxis |
| 1814 |
Financial instruments, class [member] |
Member |
|
|
ifrs-full:ClassesOfFinancialInstrumentsMember |
| 1815 |
SME and Mid Corporate [member] |
Member |
|
|
ck0001087711:SMEAndMidCorporateMember |
| 1816 |
Commercial Real Estate [member] |
Member |
|
|
ck0001087711:CommercialRealEstate1Member |
| 1817 |
Social Housing [member] |
Member |
|
|
ck0001087711:SocialHousingMember |
| 1818 |
Sovereign And Supranational [member] |
Member |
|
|
ck0001087711:SovereignAndSupranationalMember |
| 1819 |
Large Corporate [member] |
Member |
|
|
ck0001087711:LargeCorporateMember |
| 1820 |
Financial Institutions [member] |
Member |
|
|
ck0001087711:FinancialInstitutionsMember |
| 1821 |
Structured Products [member] |
Member |
|
|
ck0001087711:StructuredProductsMember |
| 1822 |
Legacy Portfolios in Run-Off [member] |
Member |
|
|
ck0001087711:LegacyPortfoliosInRunoffMember |
| 1823 |
Derivative Financial Instruments [member] |
Member |
|
|
ifrs-full:DerivativesMember |
| 1824 |
Crown dependency branch [member] |
Member |
|
|
ck0001087711:CrownDependencyBranchMember |
| 1825 |
Observed Impairment Loss Allowances [Member] |
Member |
|
|
ck0001087711:ObservedImpairmentLossAllowancesMember |
| 1826 |
Allowance for IBNO [member] |
Member |
|
|
ck0001087711:AllowanceForIBNOMember |
| 1827 |
Method of assessment of expected credit losses [axis] |
Axis |
|
|
ifrs-full:MethodOfAssessmentOfExpectedCreditLossesAxis |
| 1828 |
Method of assessment of expected credit losses [member] |
Member |
|
|
ifrs-full:MethodOfAssessmentOfExpectedCreditLossesMember |
| 1829 |
Performing Exposure [member] |
Member |
|
|
ck0001087711:PerformingExposureMember |
| 1830 |
Enhanced Monitoring [member] |
Member |
|
|
ck0001087711:EnhancedMonitoringMember |
| 1831 |
Proactive Management [member] |
Member |
|
|
ck0001087711:ProactiveManagementMember |
| 1832 |
Non-Performing Exposure [member] |
Member |
|
|
ck0001087711:NonperformingExposureMember |
| 1833 |
Disclosure of credit risk exposure [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfCreditRiskExposureLineItems |
| 1834 |
Maximum exposure to credit risk |
Concept (Monetary) |
As Of |
|
ifrs-full:MaximumExposureToCreditRisk |
| 1835 |
Observed impairment loss allowances |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:AllowanceForObservedImpairmentLossesOnCreditExposure |
| 1836 |
1156 - Disclosure - Credit Risk - Summary of Modification of Loan Terms (Other Segments Exposures) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfModificationOfLoanTermsOtherSegmentsExposures |
| 1837 |
Disclosure of credit risk exposure [table] |
Table |
* |
* |
ifrs-full:DisclosureOfCreditRiskExposureTable |
| 1838 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 1839 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 1840 |
Corporate and commercial banking [member] |
Member |
|
|
ck0001087711:CorporateAndCommercialBankingMember |
| 1841 |
Corporate and investment banking [member] |
Member |
|
|
ck0001087711:CorporateAndInvestmentBankingMember |
| 1842 |
Corporate centre [member] |
Member |
|
|
ck0001087711:CorporateCentreMember |
| 1843 |
Disclosure of credit risk exposure [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfCreditRiskExposureLineItems |
| 1844 |
Amortised cost before modification |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:FinancialAssetsWithContractualCashFlowsModifiedDuringReportingPeriodWhileLossAllowanceMeasuredAtLifetimeExpectedCreditLossesAmortisedCostBeforeModification |
| 1845 |
Net modification loss |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:FinancialAssetsWithContractualCashFlowsModifiedDuringReportingPeriodWhileLossAllowanceMeasuredAtLifetimeExpectedCreditLossesModificationGainLoss |
| 1846 |
Gross carrying amount of financial assets for which the ECL allowance has changed to 12-month measurement during the year |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssetsWithModifiedContractualCashFlowsWhileLossAllowanceMeasuredAtLifetimeExpectedCreditLossesForWhichLossAllowanceChangedDuringReportingPeriodTo12monthExpectedCreditLossesGrossCarryingAmount |
| 1847 |
1157 - Disclosure - Credit Risk - Summary of Other Segments by Forbearance Applied (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfOtherSegmentsByForbearanceApplied |
| 1848 |
Disclosure Of Forbearance [table] |
Table |
* |
* |
ck0001087711:DisclosureOfForbearanceTable |
| 1849 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 1850 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 1851 |
Corporate and commercial banking [member] |
Member |
|
|
ck0001087711:CorporateAndCommercialBankingMember |
| 1852 |
Corporate and investment banking [member] |
Member |
|
|
ck0001087711:CorporateAndInvestmentBankingMember |
| 1853 |
Corporate centre [member] |
Member |
|
|
ck0001087711:CorporateCentreMember |
| 1854 |
Classes of financial assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialAssetsAxis |
| 1855 |
Financial assets, class [member] |
Member |
|
|
ifrs-full:FinancialAssetsMember |
| 1856 |
Stage 1 [member] |
Member |
|
|
ck0001087711:StageOneMember |
| 1857 |
Stage 2 [member] |
Member |
|
|
ck0001087711:StageTwoMember |
| 1858 |
Stage 3 [member] |
Member |
|
|
ck0001087711:StageThreeMember |
| 1859 |
Classes of financial instruments [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialInstrumentsAxis |
| 1860 |
Financial instruments, class [member] |
Member |
|
|
ifrs-full:ClassesOfFinancialInstrumentsMember |
| 1861 |
Non-performing loans by forbearance [member] |
Member |
|
|
ck0001087711:NonPerformingLoansByForbearanceMember |
| 1862 |
Performing [member] |
Member |
|
|
ck0001087711:PerformingForbearanceMember |
| 1863 |
Disclosure Of Forbearance [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfForbearanceLineItems |
| 1864 |
- Term extension |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:LoansTermExtensionForbearance |
| 1865 |
- Interest-only |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:LoansInterestOnlyForbearance |
| 1866 |
- Other payment rescheduling |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:LoansCapitalisationForbearance |
| 1867 |
Loans forbearance |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:LoansForbearance |
| 1868 |
Proportion of portfolio |
Concept (Percent) |
As Of |
|
ck0001087711:LoansProportionOfPortfolioForbearancePercentage |
| 1869 |
1158 - Disclosure - Credit Risk - Summary of Commercial Real Estate by Credit Performance (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfCommercialRealEstateByCreditPerformance |
| 1870 |
Disclosure of performance obligations [table] |
Table |
* |
* |
ifrs-full:DisclosureOfPerformanceObligationsTable |
| 1871 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 1872 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 1873 |
Commercial Real Estate [member] |
Member |
|
|
ck0001087711:CommercialRealEstateSegmentMember |
| 1874 |
Disclosure of performance obligations [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfPerformanceObligationsLineItems |
| 1875 |
Customer loans |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:LoansAndAdvancesToCustomers |
| 1876 |
NPLs |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:NonPerformingLoans |
| 1877 |
NPL ratio |
Concept (Percent) |
As Of |
|
ck0001087711:NonPerformingLoansRatio |
| 1878 |
Gross write-offs |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:GrossWriteoffs |
| 1879 |
Impairment loss allowances |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:ImpairmentLossAllowances |
| 1880 |
1159 - Disclosure - Credit Risk - Summary of Commercial Real Estate by Credit Performance (Parenthetical) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfCommercialRealEstateByCreditPerformanceParenthetical |
| 1881 |
Disclosure of performance obligations [table] |
Table |
* |
* |
ifrs-full:DisclosureOfPerformanceObligationsTable |
| 1882 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 1883 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 1884 |
Retail Banking Segment [member] |
Member |
|
|
ck0001087711:RetailBankingSegmentMember |
| 1885 |
Commercial Real Estate [member] |
Member |
|
|
ck0001087711:CommercialRealEstateSegmentMember |
| 1886 |
Disclosure of performance obligations [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfPerformanceObligationsLineItems |
| 1887 |
Consumer loans |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:ConsumerLoans |
| 1888 |
1160 - Disclosure - Credit Risk - Summary of Commercial Real Estate by Loan to Value (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfCommercialRealEstateByLoanToValue |
| 1889 |
Disclosure Of Loan To Value [table] |
Table |
* |
* |
ck0001087711:DisclosureOfLoanToValueTable |
| 1890 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 1891 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 1892 |
Commercial Real Estate [member] |
Member |
|
|
ck0001087711:CommercialRealEstate1Member |
| 1893 |
Classes of financial instruments [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialInstrumentsAxis |
| 1894 |
Financial instruments, class [member] |
Member |
|
|
ifrs-full:ClassesOfFinancialInstrumentsMember |
| 1895 |
Non performing loans [member] |
Member |
|
|
ck0001087711:NonPerformingLoansMember |
| 1896 |
Range [axis] |
Axis |
|
|
ifrs-full:RangeAxis |
| 1897 |
Ranges [member] |
Member |
|
|
ifrs-full:RangesMember |
| 1898 |
Less Than Or Equal To Fifty Percentage [Member] |
Member |
|
|
ck0001087711:LessThanOrEqualToFiftyPercentageMember |
| 1899 |
Greater than fifty percentage to seventy percentage [member] |
Member |
|
|
ck0001087711:GreaterThanFiftyPercentageToSeventyPercentageMember |
| 1900 |
Greater Than 70-100% [member] |
Member |
|
|
ck0001087711:GreaterThanSeventyToHundredPercentageMember |
| 1901 |
Greater Than 100% [member] |
Member |
|
|
ck0001087711:GreaterThanHundredPercentageMember |
| 1902 |
Standardised Portfolio [member] |
Member |
|
|
ck0001087711:StandardizedPortfolioMember |
| 1903 |
Total With Collateral [member] |
Member |
|
|
ck0001087711:CollateralMember |
| 1904 |
Products and services [axis] |
Axis |
|
|
ifrs-full:ProductsAndServicesAxis |
| 1905 |
Products and services [member] |
Member |
|
|
ifrs-full:ProductsAndServicesMember |
| 1906 |
Development Loans [member] |
Member |
|
|
ck0001087711:DevelopmentLoansMember |
| 1907 |
Disclosure Of Loan To Value [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfLoanToValueLineItems |
| 1908 |
Loans and advances to customers |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:LoansAndAdvancesToCustomers |
| 1909 |
Percentage of loan to value |
Concept (Percent) |
As Of |
|
ck0001087711:PercentageOfLoanToValueStock |
| 1910 |
1161 - Disclosure - Credit Risk - Summary of Commercial Real Estate by Sector (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfCommercialRealEstateBySector |
| 1911 |
Disclosure Of Loans And Advances By Industry Sector [table] |
Table |
* |
* |
ck0001087711:DisclosureOfLoansAndAdvancesByIndustrySectorTable |
| 1912 |
Classes of financial instruments [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialInstrumentsAxis |
| 1913 |
Financial instruments, class [member] |
Member |
|
|
ifrs-full:ClassesOfFinancialInstrumentsMember |
| 1914 |
Commercial Real Estate [member] |
Member |
|
|
ck0001087711:CommercialRealEstate1Member |
| 1915 |
Categories of financial assets [axis] |
Axis |
|
|
ifrs-full:CategoriesOfFinancialAssetsAxis |
| 1916 |
Financial assets, category [member] |
Member |
|
|
ifrs-full:FinancialAssetsCategoryMember |
| 1917 |
Office [member] |
Member |
|
|
ck0001087711:OfficeSectorMember |
| 1918 |
Retail [member] |
Member |
|
|
ck0001087711:RetailMember |
| 1919 |
Industrial [member] |
Member |
|
|
ck0001087711:IndustrialMember |
| 1920 |
Residential [member] |
Member |
|
|
ck0001087711:ResidentialMember |
| 1921 |
Mixed Use [member] |
Member |
|
|
ck0001087711:MixedUseMember |
| 1922 |
Student Accommodation [member] |
Member |
|
|
ck0001087711:StudentLoansMember |
| 1923 |
Hotels and Leisure [member] |
Member |
|
|
ck0001087711:HotelsAndLeisureMember |
| 1924 |
Other [member] |
Member |
|
|
ck0001087711:OtherPortfolioMember |
| 1925 |
Standardised Portfolio [member] |
Member |
|
|
ck0001087711:StandardizedPortfolioSectorMember |
| 1926 |
Disclosure Of Loans And Advances By Industry Sector [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfLoansAndAdvancesByIndustrySectorLineItems |
| 1927 |
Loans and advances to customers |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:LoansAndAdvancesToCustomers |
| 1928 |
Percentage of total CRE Portfolio |
Concept (Percent) |
As Of |
|
ck0001087711:PercentageOfCommercialRealEstatePortfolio |
| 1929 |
1162 - Disclosure - Credit Risk - Summary of Social Housing Exposure (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditRiskSummaryOfSocialHousingExposure |
| 1930 |
Disclosure Of Social Housing Exposure [table] |
Table |
* |
* |
ck0001087711:DisclosureOfSocialHousingExposureTable |
| 1931 |
Classes of financial instruments [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialInstrumentsAxis |
| 1932 |
Financial instruments, class [member] |
Member |
|
|
ifrs-full:ClassesOfFinancialInstrumentsMember |
| 1933 |
Social Housing [member] |
Member |
|
|
ck0001087711:SocialHousingMember |
| 1934 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 1935 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 1936 |
Corporate and commercial banking [member] |
Member |
|
|
ck0001087711:CorporateAndCommercialBankingMember |
| 1937 |
Corporate centre [member] |
Member |
|
|
ck0001087711:CorporateCentreMember |
| 1938 |
Disclosure Of Social Housing Exposure [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfSocialHousingExposureLineItems |
| 1939 |
Drawn |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:LoansAndAdvancesToCustomers |
| 1940 |
Total |
Concept (Monetary) |
As Of |
|
ifrs-full:MaximumExposureToCreditRisk |
| 1941 |
1163 - Disclosure - Market Risk - Summary of Balance Sheet Allocation by Market Risk Classification (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureMarketRiskSummaryOfBalanceSheetAllocationByMarketRiskClassification |
| 1942 |
Market Risk [table] |
Table |
* |
* |
ck0001087711:MarketRiskTable |
| 1943 |
Types of risks [axis] |
Axis |
|
|
ifrs-full:TypesOfRisksAxis |
| 1944 |
Risks [member] |
Member |
|
|
ifrs-full:TypesOfRisksMember |
| 1945 |
Banking Market Risk [member] |
Member |
|
|
ck0001087711:BankingMarketRiskMember |
| 1946 |
Trading Market Risk [member] |
Member |
|
|
ck0001087711:TradingMarketRiskMember |
| 1947 |
Market Risk [member] |
Member |
|
|
ifrs-full:MarketRiskMember |
| 1948 |
Market Risk [line items] |
LineItems |
|
|
ck0001087711:MarketRiskLineItems |
| 1949 |
Cash and balances at central banks |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:CashAndBankBalancesAtCentralBanks |
| 1950 |
- Trading assets |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTrading |
| 1951 |
- Derivative financial instruments |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:DerivativeFinancialAssets |
| 1952 |
- Other financial assets at FVTPL |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:OtherFinancialAssetsAtFairValueThroughProfitOrLoss |
| 1953 |
- Loans and advances to customers |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:LoansAndAdvancesToCustomers |
| 1954 |
- Loans and advances to banks |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:LoansAndAdvancesToBanks |
| 1955 |
- Reverse repurchase agreements - non trading |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:FinancialAssetsAtAmortisedCostReverseRepurchaseAgreementsNonTrading |
| 1956 |
- Other financial assets at amortised cost |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:OtherFinancialAssetsAtAmortisedCost |
| 1957 |
Financial assets at FVOCI |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncome |
| 1958 |
Financial investments |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:FinancialInvestments |
| 1959 |
Macro hedge of interest rate risk |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:MacroHedgeOfInterestRateRisk |
| 1960 |
Retirement benefit assets |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:RecognisedAssetsDefinedBenefitPlan |
| 1961 |
Total assets |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:Assets |
| 1962 |
- Trading liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossClassifiedAsHeldForTrading |
| 1963 |
- Derivative financial instruments |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:DerivativeFinancialLiabilities |
| 1964 |
- Other financial liabilities at FVTPL |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:OtherFinancialLiabilitiesAtFairValueThroughProfitOrLoss |
| 1965 |
- Deposits by customers |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:DepositsFromCustomers |
| 1966 |
- Deposits by banks |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:DepositsFromBanks |
| 1967 |
- Repurchase agreements - non trading |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:FinancialLiabilitiesAtAmortisedCostRepurchaseAgreementsNonTrading |
| 1968 |
- Debt securities in issue |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:DebtSecurities |
| 1969 |
- Subordinated liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:SubordinatedLiabilities |
| 1970 |
Macro hedge of interest rate risk |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:MacroHedgeOfInterestRateRiskLiability |
| 1971 |
Retirement benefit obligations |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:RecognisedLiabilitiesDefinedBenefitPlan |
| 1972 |
Total liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:Liabilities |
| 1973 |
1164 - Disclosure - Market Risk - Summary of Balance Sheet Allocation by Market Risk Classification (Parenthetical) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureMarketRiskSummaryOfBalanceSheetAllocationByMarketRiskClassificationParenthetical |
| 1974 |
Market Risk [table] |
Table |
* |
* |
ck0001087711:MarketRiskTable |
| 1975 |
Classes of liabilities [axis] |
Axis |
|
|
ifrs-full:ClassesOfLiabilitiesAxis |
| 1976 |
Liabilities [member] |
Member |
|
|
ifrs-full:LiabilitiesMember |
| 1977 |
Other Liabilities [member] |
Member |
|
|
ck0001087711:OtherLiabilities1Member |
| 1978 |
Classes of assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfAssetsAxis |
| 1979 |
Assets [member] |
Member |
|
|
ifrs-full:ClassesOfAssetsMember |
| 1980 |
Other Assets [member] |
Member |
|
|
ifrs-full:OtherAssetsMember |
| 1981 |
Market Risk [line items] |
LineItems |
|
|
ck0001087711:MarketRiskLineItems |
| 1982 |
Macro hedge of interest rate risk including other assets |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:MacroHedgeOfInterestRateRisk |
| 1983 |
Macro hedge of interest rate risk including other liabilities |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:MacroHedgeOfInterestRateRiskLiability |
| 1984 |
1165 - Disclosure - Market Risk - Summary of NIM and EVE Sensitivity of Interest Rate Risk (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureMarketRiskSummaryOfNIMAndEVESensitivityOfInterestRateRisk |
| 1985 |
Disclosure Of Sensitivity Limit Of Risk [table] |
Table |
* |
* |
ck0001087711:DisclosureOfSensitivityLimitOfRiskTable |
| 1986 |
Range [axis] |
Axis |
|
|
ifrs-full:RangeAxis |
| 1987 |
Ranges [member] |
Member |
|
|
ifrs-full:RangesMember |
| 1988 |
+50bps [member] |
Member |
|
|
ck0001087711:IncreaseOfFiftyBasisPointsMember |
| 1989 |
-50bps [member] |
Member |
|
|
ck0001087711:DecreaseOfFiftyBasisPointsMember |
| 1990 |
Disclosure Of Sensitivity Limit Of Risk [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfSensitivityLimitOfRiskLineItems |
| 1991 |
NIM sensitivity |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:NIMSensitivityRiskLimit |
| 1992 |
EVE sensitivity (unaudited) |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:EVESensitivityRiskLimit |
| 1993 |
1166 - Disclosure - Market Risk - Summary of NIM and EVE Sensitivity of Interest Rate Risk (Parenthetical) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureMarketRiskSummaryOfNIMAndEVESensitivityOfInterestRateRiskParenthetical |
| 1994 |
Disclosure Of Sensitivity Limit Of Risk [table] |
Table |
* |
* |
ck0001087711:DisclosureOfSensitivityLimitOfRiskTable |
| 1995 |
Range [axis] |
Axis |
|
|
ifrs-full:RangeAxis |
| 1996 |
Ranges [member] |
Member |
|
|
ifrs-full:RangesMember |
| 1997 |
+50bps [member] |
Member |
|
|
ck0001087711:IncreaseOfFiftyBasisPointsMember |
| 1998 |
-50bps [member] |
Member |
|
|
ck0001087711:DecreaseOfFiftyBasisPointsMember |
| 1999 |
Disclosure Of Sensitivity Limit Of Risk [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfSensitivityLimitOfRiskLineItems |
| 2000 |
Shift in basis point |
Concept (Percent) |
As Of |
|
ck0001087711:ShiftInBasisPoint |
| 2001 |
1167 - Disclosure - Market Risk - Summary of Internal VaR for Exposure to Main Classes of Risk (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureMarketRiskSummaryOfInternalVaRForExposureToMainClassesOfRisk |
| 2002 |
Market Risk [table] |
Table |
* |
* |
ck0001087711:MarketRiskTable |
| 2003 |
Range [axis] |
Axis |
|
|
ifrs-full:RangeAxis |
| 2004 |
Ranges [member] |
Member |
|
|
ifrs-full:RangesMember |
| 2005 |
Weighted average [member] |
Member |
|
|
ifrs-full:WeightedAverageMember |
| 2006 |
Top of Range [member] |
Member |
|
|
ifrs-full:TopOfRangeMember |
| 2007 |
Bottom of Range [member] |
Member |
|
|
ifrs-full:BottomOfRangeMember |
| 2008 |
Types of risks [axis] |
Axis |
|
|
ifrs-full:TypesOfRisksAxis |
| 2009 |
Risks [member] |
Member |
|
|
ifrs-full:TypesOfRisksMember |
| 2010 |
Interest Rate Risks [member] |
Member |
|
|
ifrs-full:InterestRateRiskMember |
| 2011 |
Equity Risks [member] |
Member |
|
|
ifrs-full:EquityPriceRiskMember |
| 2012 |
Currency Risk [member] |
Member |
|
|
ifrs-full:CurrencyRiskMember |
| 2013 |
Diversification Offsets [member] |
Member |
|
|
ifrs-full:RiskDiversificationEffectMember |
| 2014 |
Market Risk [line items] |
LineItems |
|
|
ck0001087711:MarketRiskLineItems |
| 2015 |
Risk exposure |
Concept (Monetary) |
As Of |
|
ifrs-full:ValueAtRisk |
| 2016 |
1168 - Disclosure - Liquidity Risk - Summary of Reconciliation of Wholesale Funding to Balance Sheet (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureLiquidityRiskSummaryOfReconciliationOfWholesaleFundingToBalanceSheet |
| 2017 |
Reconciliation Of Wholesale Funding To Balance Sheet [table] |
Table |
* |
* |
ck0001087711:ReconciliationOfWholesaleFundingToBalanceSheetTable |
| 2018 |
Types of risks [axis] |
Axis |
|
|
ifrs-full:TypesOfRisksAxis |
| 2019 |
Risks [member] |
Member |
|
|
ifrs-full:TypesOfRisksMember |
| 2020 |
Liquidity risk [member] |
Member |
|
|
ifrs-full:LiquidityRiskMember |
| 2021 |
Cash And Cash Equivalents 1 [axis] |
Axis |
|
|
ck0001087711:CashAndCashEquivalents1Axis |
| 2022 |
Share-based Incentive Plans [member] |
Member |
|
|
ck0001087711:SharebasedIncentivePlansMember |
| 2023 |
Wholesale Funding [member] |
Member |
|
|
ck0001087711:WholesaleFundingMember |
| 2024 |
Borrowings by name [axis] |
Axis |
|
|
ifrs-full:BorrowingsByNameAxis |
| 2025 |
Borrowings by name [member] |
Member |
|
|
ifrs-full:BorrowingsByNameMember |
| 2026 |
Deposits [member] |
Member |
|
|
ck0001087711:Deposits1Member |
| 2027 |
Certificates of Deposit and Commercial Paper [member] |
Member |
|
|
ck0001087711:CertificatesOfDepositAndCommercialPaperMember |
| 2028 |
Senior Unsecured - Public Benchmark [member] |
Member |
|
|
ck0001087711:SeniorUnsecuredPublicBenchmarkMember |
| 2029 |
Senior Unsecured - Privately Placed [member] |
Member |
|
|
ck0001087711:SeniorUnsecuredPrivatelyPlacedMember |
| 2030 |
Covered Bonds [member] |
Member |
|
|
ck0001087711:CoveredBondsMember |
| 2031 |
Securitisation and Structured Issuance [member] |
Member |
|
|
ck0001087711:SecuritisationAndStructuredIssuanceMember |
| 2032 |
Term Funding Scheme [member] |
Member |
|
|
ck0001087711:TermFundingSchemeMember |
| 2033 |
Subordinated Liabilities and Equity [member] |
Member |
|
|
ck0001087711:SubordinatedLiabilitiesAndEquityMember |
| 2034 |
Repurchase Agreement [member] |
Member |
|
|
ck0001087711:RepurchaseAgreementMember |
| 2035 |
Foreign Exchange And Hedge Accounting [member] |
Member |
|
|
ck0001087711:ForeignExchangeAndHedgeAccountingMember |
| 2036 |
Other Borrowing [Member] |
Member |
|
|
ck0001087711:OtherBorrowingMember |
| 2037 |
Reconciliation Of Wholesale Funding To Balance Sheet [line items] |
LineItems |
|
|
ck0001087711:ReconciliationOfWholesaleFundingToBalanceSheetLineItems |
| 2038 |
Funding analysis |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:FundingAnalysis |
| 2039 |
Deposits by banks |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:DepositsFromBanks |
| 2040 |
Deposits by customers |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:DepositsFromCustomers |
| 2041 |
Repurchase agreements - non trading |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:RepurchaseAgreementsAndCashCollateralOnSecuritiesLent |
| 2042 |
Trading liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossClassifiedAsHeldForTrading |
| 2043 |
Financial liabilities at fair value |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedAsUponInitialRecognition |
| 2044 |
Debt securities in issue |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:DebtSecurities |
| 2045 |
Subordinated liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:SubordinatedLiabilities |
| 2046 |
Other equity and non-controlling interests |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:OtherEquityAndNoncontrollingInterests |
| 2047 |
1169 - Disclosure - Liquidity Risk - Summary of Reconciliation of Wholesale Funding to Balance Sheet (Parenthetical) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureLiquidityRiskSummaryOfReconciliationOfWholesaleFundingToBalanceSheetParenthetical |
| 2048 |
Reconciliation Of Wholesale Funding To Balance Sheet [table] |
Table |
* |
* |
ck0001087711:ReconciliationOfWholesaleFundingToBalanceSheetTable |
| 2049 |
Components of equity [axis] |
Axis |
|
|
ifrs-full:ComponentsOfEquityAxis |
| 2050 |
Equity [member] |
Member |
|
|
ifrs-full:EquityMember |
| 2051 |
Fixed/Floating Rate Non-Cumulative Callable Preference Shares [member] |
Member |
|
|
ck0001087711:NoncumulativeCallablePreferenceSharesMember |
| 2052 |
Step-Up Callable Perpetual Reserve Capital Instruments [member] |
Member |
|
|
ck0001087711:StepupCallablePerpetualReserveCapitalInstrumentsMember |
| 2053 |
Perpetual Capital Securities [member] |
Member |
|
|
ck0001087711:PerpetualCapitalSecuritiesMember |
| 2054 |
Types of risks [axis] |
Axis |
|
|
ifrs-full:TypesOfRisksAxis |
| 2055 |
Risks [member] |
Member |
|
|
ifrs-full:TypesOfRisksMember |
| 2056 |
Liquidity risk [member] |
Member |
|
|
ifrs-full:LiquidityRiskMember |
| 2057 |
Reconciliation Of Wholesale Funding To Balance Sheet [line items] |
LineItems |
|
|
ck0001087711:ReconciliationOfWholesaleFundingToBalanceSheetLineItems |
| 2058 |
Deposit from customers |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:DepositsFromCustomers |
| 2059 |
Other equity and non-controlling interests |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:OtherEquityInterest |
| 2060 |
1170 - Disclosure - Liquidity Risk - Summary of Sources of Wholesale Funding by Maturity (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureLiquidityRiskSummaryOfSourcesOfWholesaleFundingByMaturity |
| 2061 |
Disclosure of Sources of Wholesale Funding [table] |
Table |
* |
* |
ck0001087711:DisclosureOfSourcesOfWholesaleFundingTable |
| 2062 |
Maturity [axis] |
Axis |
|
|
ifrs-full:MaturityAxis |
| 2063 |
Aggregated time bands [member] |
Member |
|
|
ifrs-full:AggregatedTimeBandsMember |
| 2064 |
Not Later Than One Month [member] |
Member |
|
|
ifrs-full:NotLaterThanOneMonthMember |
| 2065 |
Greater Than 1 and Less Than 3 Months [member] |
Member |
|
|
ifrs-full:LaterThanOneMonthAndNotLaterThanThreeMonthsMember |
| 2066 |
Greater Than 3 and Less Than 6 Months [member] |
Member |
|
|
ifrs-full:LaterThanThreeMonthsAndNotLaterThanSixMonthsMember |
| 2067 |
Greater Than 6 and Less Than 9 Months [member] |
Member |
|
|
ck0001087711:LaterThanSixMonthsAndNotLaterThanNineMonthsMember |
| 2068 |
Greater Than 9 and Less Than 12 Months [member] |
Member |
|
|
ck0001087711:LaterThanNineMonthsAndNotLaterThanOneYearMember |
| 2069 |
Not Later Than 1 Year [member] |
Member |
|
|
ifrs-full:NotLaterThanOneYearMember |
| 2070 |
Later Than 1 Year and Not Later Than 2 Years [member] |
Member |
|
|
ifrs-full:LaterThanOneYearAndNotLaterThanTwoYearsMember |
| 2071 |
Later Than 2 Year and Not Later Than 5 Years [member] |
Member |
|
|
ifrs-full:LaterThanTwoYearsAndNotLaterThanFiveYearsMember |
| 2072 |
Later Than Five Years [member] |
Member |
|
|
ifrs-full:LaterThanFiveYearsMember |
| 2073 |
Borrowings by name [axis] |
Axis |
|
|
ifrs-full:BorrowingsByNameAxis |
| 2074 |
Borrowings by name [member] |
Member |
|
|
ifrs-full:BorrowingsByNameMember |
| 2075 |
Downstreamed From Santander UK Group Holdings Plc to Santander UK Plc [member] |
Member |
|
|
ck0001087711:DownstreamedFromSantanderUKGroupHoldingsPlcToSantanderUKPlcMember |
| 2076 |
Other Santander UK Plc [member] |
Member |
|
|
ck0001087711:OtherSantanderUKPlcMember |
| 2077 |
Other Group Entities [member] |
Member |
|
|
ck0001087711:OtherGroupEntitiesMember |
| 2078 |
Disclosure of Maturity of Wholesale Funding [Line Items] |
LineItems |
|
|
ck0001087711:DisclosureOfSourcesOfWholesaleFundingLineItems |
| 2079 |
Deposits by banks |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:DepositsFromBanks |
| 2080 |
Certificates of deposit and commercial paper |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:CertificatesOfDepositAndCommercialPaper |
| 2081 |
Senior unsecured - public benchmark |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:SeniorUnsecuredPublicBenchmark |
| 2082 |
Senior unsecured - privately placed |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:SeniorUnsecuredPrivatelyPlaced |
| 2083 |
Covered bonds |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:CoveredBonds |
| 2084 |
Subordinated liabilities and equity (incl. AT1) |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:SubordinatedLiabilitiesAndEquity |
| 2085 |
Securitisation and structured issuance |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:SecuritisationAndStructuredIssuance |
| 2086 |
Term Funding Scheme |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:TermFundingScheme |
| 2087 |
Subordinated liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:SubordinatedLiabilities |
| 2088 |
Wholesale fund amount |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:WholesaleFundAmount |
| 2089 |
Of which: - secured |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:SecuredWholesaleFundAmount |
| 2090 |
Of which: - unsecured |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:UnsecuredWholesaleFundAmount |
| 2091 |
1171 - Disclosure - Liquidity Risk - Summary of Wholesale Funding by Currency (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureLiquidityRiskSummaryOfWholesaleFundingByCurrency |
| 2092 |
Currency Composition Of Wholesale Funds [table] |
Table |
* |
* |
ck0001087711:CurrencyCompositionOfWholesaleFundsTable |
| 2093 |
Currency [Axis] |
Axis |
|
|
srt:CurrencyAxis |
| 2094 |
All Currencies [Domain] |
Member |
|
|
currency:AllCurrenciesDomain |
| 2095 |
United Kingdom, Pounds [member] |
Member |
|
|
currency:GBP |
| 2096 |
United States of America, Dollars [member] |
Member |
|
|
currency:USD |
| 2097 |
Euro Member Countries, Euro [member] |
Member |
|
|
currency:EUR |
| 2098 |
Other [member] |
Member |
|
|
ck0001087711:OtherCurrenciesMember |
| 2099 |
Types of risks [axis] |
Axis |
|
|
ifrs-full:TypesOfRisksAxis |
| 2100 |
Risks [member] |
Member |
|
|
ifrs-full:TypesOfRisksMember |
| 2101 |
Liquidity risk [member] |
Member |
|
|
ifrs-full:LiquidityRiskMember |
| 2102 |
Counterparties [axis] |
Axis |
|
|
ifrs-full:CounterpartiesAxis |
| 2103 |
Counterparties [member] |
Member |
|
|
ifrs-full:CounterpartiesMember |
| 2104 |
Downstreamed From Santander UK Group Holdings Plc to Santander UK Plc [member] |
Member |
|
|
ck0001087711:DownstreamedFromSantanderUKGroupHoldingsPlcToSantanderUKPlcMember |
| 2105 |
Other Santander UK Plc [member] |
Member |
|
|
ck0001087711:OtherSantanderUKPlcMember |
| 2106 |
Other Group Entities [member] |
Member |
|
|
ck0001087711:OtherGroupEntitiesMember |
| 2107 |
Borrowings by name [axis] |
Axis |
|
|
ifrs-full:BorrowingsByNameAxis |
| 2108 |
Borrowings by name [member] |
Member |
|
|
ifrs-full:BorrowingsByNameMember |
| 2109 |
Senior Unsecured - Public Benchmark [member] |
Member |
|
|
ck0001087711:SeniorUnsecuredPublicBenchmarkMember |
| 2110 |
Senior Unsecured - Privately Placed [member] |
Member |
|
|
ck0001087711:SeniorUnsecuredPrivatelyPlacedMember |
| 2111 |
Subordinated Liabilities and Equity [member] |
Member |
|
|
ck0001087711:SubordinatedLiabilitiesAndEquityMember |
| 2112 |
Deposits by banks [member] |
Member |
|
|
ck0001087711:DepositsByBanksMember |
| 2113 |
Certificates of Deposit and Commercial Paper [member] |
Member |
|
|
ck0001087711:CertificatesOfDepositAndCommercialPaperMember |
| 2114 |
Covered Bonds [member] |
Member |
|
|
ck0001087711:CoveredBondsMember |
| 2115 |
Securitisation and Structured Issuance [member] |
Member |
|
|
ck0001087711:SecuritisationAndStructuredIssuanceMember |
| 2116 |
Term Funding Scheme [member] |
Member |
|
|
ck0001087711:TermFundingSchemeMember |
| 2117 |
Subordinated liabilities [member] |
Member |
|
|
ck0001087711:SubordinatedLiabilitiesMember |
| 2118 |
Currency Composition Of Wholesale Funds [line items] |
LineItems |
|
|
ck0001087711:CurrencyCompositionOfWholesaleFundsLineItems |
| 2119 |
Percentage of wholesale funding by major currencies |
Concept (Percent) |
As Of |
|
ck0001087711:PercentageOfWholesaleFundingByCurrencies |
| 2120 |
1172 - Disclosure - Liquidity Risk - Summary of External Term Issuance (Sterling Equivalent) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureLiquidityRiskSummaryOfExternalTermIssuanceSterlingEquivalent |
| 2121 |
Disclosure of detailed information about borrowings [table] |
Table |
* |
* |
ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsTable |
| 2122 |
Currency [Axis] |
Axis |
|
|
srt:CurrencyAxis |
| 2123 |
All Currencies [Domain] |
Member |
|
|
currency:AllCurrenciesDomain |
| 2124 |
United Kingdom, Pounds [member] |
Member |
|
|
currency:GBP |
| 2125 |
United States of America, Dollars [member] |
Member |
|
|
currency:USD |
| 2126 |
Euro Member Countries, Euro [member] |
Member |
|
|
currency:EUR |
| 2127 |
Types of risks [axis] |
Axis |
|
|
ifrs-full:TypesOfRisksAxis |
| 2128 |
Risks [member] |
Member |
|
|
ifrs-full:TypesOfRisksMember |
| 2129 |
Liquidity risk [member] |
Member |
|
|
ifrs-full:LiquidityRiskMember |
| 2130 |
Counterparties [axis] |
Axis |
|
|
ifrs-full:CounterpartiesAxis |
| 2131 |
Counterparties [member] |
Member |
|
|
ifrs-full:CounterpartiesMember |
| 2132 |
Downstreamed From Santander UK Group Holdings Plc to Santander UK Plc [member] |
Member |
|
|
ck0001087711:DownstreamedFromSantanderUKGroupHoldingsPlcToSantanderUKPlcMember |
| 2133 |
Other Santander UK Plc [member] |
Member |
|
|
ck0001087711:OtherSantanderUKPlcMember |
| 2134 |
Other Group Entities [member] |
Member |
|
|
ck0001087711:OtherGroupEntitiesMember |
| 2135 |
Borrowings by name [axis] |
Axis |
|
|
ifrs-full:BorrowingsByNameAxis |
| 2136 |
Borrowings by name [member] |
Member |
|
|
ifrs-full:BorrowingsByNameMember |
| 2137 |
Senior Unsecured - Public Benchmark [member] |
Member |
|
|
ck0001087711:SeniorUnsecuredPublicBenchmarkMember |
| 2138 |
Senior Unsecured - Privately Placed [member] |
Member |
|
|
ck0001087711:SeniorUnsecuredPrivatelyPlacedMember |
| 2139 |
Subordinated Liabilities and Equity [member] |
Member |
|
|
ck0001087711:SubordinatedLiabilitiesAndEquityMember |
| 2140 |
Securitisations [member] |
Member |
|
|
ifrs-full:SecuritisationsMember |
| 2141 |
Covered Bonds [member] |
Member |
|
|
ck0001087711:CoveredBondsMember |
| 2142 |
Term Funding Scheme [member] |
Member |
|
|
ck0001087711:TermFundingSchemeMember |
| 2143 |
Disclosure of detailed information about borrowings [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems |
| 2144 |
Borrowings |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:Borrowings |
| 2145 |
1173 - Disclosure - Capital Risk - Summary of Regulatory Capital Resources (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCapitalRiskSummaryOfRegulatoryCapitalResources |
| 2146 |
Disclosure Of Regulatory Capital Resources [table] |
Table |
* |
* |
ck0001087711:DisclosureOfRegulatoryCapitalResourcesTable |
| 2147 |
Components Of Regulatory Capital [axis] |
Axis |
|
|
ck0001087711:ComponentsOfRegulatoryCapitalAxis |
| 2148 |
Components Of Regulatory Capital [member] |
Member |
|
|
ck0001087711:ComponentsOfRegulatoryCapitalMember |
| 2149 |
Tier Two Capital [member] |
Member |
|
|
ck0001087711:TierTwoCapitalMember |
| 2150 |
Disclosure of Regulatory Capital Resources [Line Items] |
LineItems |
|
|
ck0001087711:DisclosureOfRegulatoryCapitalResourcesLineItems |
| 2151 |
CET1 capital |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:CommonEquityTierOneCapitalAmount |
| 2152 |
AT1 capital |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:AdditionalTierOneCapital |
| 2153 |
Tier 1 capital |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:TierOneCapitalAmount |
| 2154 |
Total regulatory capital |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:RegulatoryCapital |
| 2155 |
1174 - Disclosure - Accounting Policies - Additional information (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureAccountingPoliciesAdditionalInformation |
| 2156 |
Disclosure of changes in accounting estimates [table] |
Table |
* |
* |
ifrs-full:DisclosureOfChangesInAccountingEstimatesTable |
| 2157 |
Classes of financial assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialAssetsAxis |
| 2158 |
Financial assets, class [member] |
Member |
|
|
ifrs-full:FinancialAssetsMember |
| 2159 |
Stage 2 [member] |
Member |
|
|
ck0001087711:StageTwoMember |
| 2160 |
Initially applied IFRSs [axis] |
Axis |
|
|
ifrs-full:InitiallyAppliedIFRSsAxis |
| 2161 |
Initially applied IFRSs [member] |
Member |
|
|
ifrs-full:InitiallyAppliedIFRSsMember |
| 2162 |
IFRS 16 [member] |
Member |
|
|
ck0001087711:IFRS16Member |
| 2163 |
IFRS 9 [member] |
Member |
|
|
ck0001087711:IFRS9Member |
| 2164 |
Actuarial assumptions [axis] |
Axis |
|
|
ifrs-full:ActuarialAssumptionsAxis |
| 2165 |
Actuarial assumptions [member] |
Member |
|
|
ifrs-full:ActuarialAssumptionsMember |
| 2166 |
House price index [Member] |
Member |
|
|
ck0001087711:HousePriceIndexMember |
| 2167 |
Categories of related parties [axis] |
Axis |
|
|
ifrs-full:CategoriesOfRelatedPartiesAxis |
| 2168 |
Entity's total for related parties [member] |
Member |
|
|
ifrs-full:EntitysTotalForRelatedPartiesMember |
| 2169 |
Santandar UK plc [member] |
Member |
|
|
ck0001087711:CompanyMember |
| 2170 |
Amounts arising from insurance contracts [axis] |
Axis |
|
|
ifrs-full:AmountsArisingFromInsuranceContractsAxis |
| 2171 |
Net amount arising from insurance contracts [member] |
Member |
|
|
ifrs-full:NetAmountArisingFromInsuranceContractsMember |
| 2172 |
Payment protection insurance [member] |
Member |
|
|
ck0001087711:PaymentProtectionInsuranceMember |
| 2173 |
Past due status [axis] |
Axis |
|
|
ifrs-full:PastDueStatusAxis |
| 2174 |
Past due status [member] |
Member |
|
|
ifrs-full:PastDueStatusMember |
| 2175 |
180 Days [member] |
Member |
|
|
ck0001087711:OneHundredAndEightyDaysMember |
| 2176 |
Classes of financial instruments [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialInstrumentsAxis |
| 2177 |
Financial instruments, class [member] |
Member |
|
|
ifrs-full:ClassesOfFinancialInstrumentsMember |
| 2178 |
Unsecured Debt [member] |
Member |
|
|
ck0001087711:UnsecuredDebt1Member |
| 2179 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 2180 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 2181 |
Retail banking Corporate and Commercial Banking and Corporate Centre [member] |
Member |
|
|
ck0001087711:RetailBankingCorporateAndCommercialBankingAndCorporateCentreMember |
| 2182 |
Corporate and investment banking [member] |
Member |
|
|
ck0001087711:CorporateAndInvestmentBankingMember |
| 2183 |
Classes of other provisions [axis] |
Axis |
|
|
ifrs-full:ClassesOfProvisionsAxis |
| 2184 |
Other provisions [member] |
Member |
|
|
ifrs-full:OtherProvisionsMember |
| 2185 |
Miscellaneous other provisions [member] |
Member |
|
|
ifrs-full:MiscellaneousOtherProvisionsMember |
| 2186 |
Disclosure of changes in accounting estimates [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfChangesInAccountingEstimatesLineItems |
| 2187 |
Loans and advances to banks |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:LoansAndAdvancesToBanks |
| 2188 |
Reverse repurchase agreements - non trading |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:ReverseRepurchaseAgreementsAndCashCollateralOnSecuritiesBorrowed |
| 2189 |
Deposit by banks |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:DepositsFromBanks |
| 2190 |
Repurchase agreements - non trading |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:RepurchaseAgreementsAndCashCollateralOnSecuritiesLent |
| 2191 |
Increase Property, plant and equipment |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:IncreaseDecreasePropertyPlantAndEquipment |
| 2192 |
Other assets |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:OtherAssets |
| 2193 |
Other liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:OtherLiabilities |
| 2194 |
Provisions |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:Provisions |
| 2195 |
Written off period for past due |
Concept (xbrli:durationItemType) |
For Period |
|
ck0001087711:WrittenOffPeriodForPastDue |
| 2196 |
Expected credit losses allowance |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:ExpectedCreditLossesAllowance |
| 2197 |
Probability weight |
Concept (Percent) |
For Period |
|
ck0001087711:ProbabilityWeightedAverageOfExpectedCreditLosses |
| 2198 |
Expected credit losses allowance for residential mortgages |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:ExpectedCreditLossesAllowanceForResidentialMortgages |
| 2199 |
Additional provisions |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:AdditionalProvisionsOtherProvisions |
| 2200 |
Additional operational risk losses and restructuring charges |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:AdditionalProvisionsOtherProvisionsOperationalRiskLossesAndRestructuringCharges |
| 2201 |
Defined benefit pension schemes in net asset having surplus |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:RecognisedAssetsDefinedBenefitPlan |
| 2202 |
Defined benefit pension schemes in net liabilities having deficit |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:RecognisedLiabilitiesDefinedBenefitPlan |
| 2203 |
1175 - Disclosure - Accounting Policies - Summary of Useful Lives or Depreciation Rates Used for Property, Plant and Equipment (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureAccountingPoliciesSummaryOfUsefulLivesOrDepreciationRatesUsedForPropertyPlantAndEquipment |
| 2204 |
Disclosure of detailed information about property, plant and equipment [table] |
Table |
* |
* |
ifrs-full:DisclosureOfPropertyPlantAndEquipmentTable |
| 2205 |
Range [axis] |
Axis |
|
|
ifrs-full:RangeAxis |
| 2206 |
Ranges [member] |
Member |
|
|
ifrs-full:RangesMember |
| 2207 |
Bottom of Range [member] |
Member |
|
|
ifrs-full:BottomOfRangeMember |
| 2208 |
Top of Range [member] |
Member |
|
|
ifrs-full:TopOfRangeMember |
| 2209 |
Classes of property, plant and equipment [axis] |
Axis |
|
|
ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis |
| 2210 |
Property, plant and equipment [member] |
Member |
|
|
ifrs-full:PropertyPlantAndEquipmentMember |
| 2211 |
Owner-occupied properties [member] |
Member |
|
|
ck0001087711:OwnerOccupiedPropertiesMember |
| 2212 |
Office Fixtures and Equipment [member] |
Member |
|
|
ck0001087711:OfficeFixturesAndEquipmentMember |
| 2213 |
Computer Software [member] |
Member |
|
|
ifrs-full:ComputerSoftwareMember |
| 2214 |
Disclosure of detailed information about property, plant and equipment [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems |
| 2215 |
Useful lives or depreciation rates, property, plant and equipment |
Concept (xbrli:durationItemType) |
For Period |
|
ck0001087711:UsefulLivesPropertyPlantAndEquipment |
| 2216 |
1176 - Disclosure - Accounting Policies - Summary of Probability Weights Applied for Each Scenario of Expected Credit Losses Allowance (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureAccountingPoliciesSummaryOfProbabilityWeightsAppliedForEachScenarioOfExpectedCreditLossesAllowance |
| 2217 |
Disclosure of probability weightings of scenarios [table] |
Table |
* |
* |
ck0001087711:DisclosureOfProbabilityWeightingsOfScenariosTable |
| 2218 |
Project by scenario [axis] |
Axis |
|
|
ck0001087711:ProjectByScenarioAxis |
| 2219 |
Project by scenario [member] |
Member |
|
|
ck0001087711:ProjectByScenarioMember |
| 2220 |
Upside 2 [member] |
Member |
|
|
ck0001087711:UpsideTwoScenarioMember |
| 2221 |
Upside 1 [member] |
Member |
|
|
ck0001087711:UpsideOneScenarioMember |
| 2222 |
Base case [member] |
Member |
|
|
ck0001087711:BaseCaseScenarioMember |
| 2223 |
Downside 1 [member] |
Member |
|
|
ck0001087711:DownsideOneScenarioMember |
| 2224 |
Downside 2 [member] |
Member |
|
|
ck0001087711:DownsideTwoScenarioMember |
| 2225 |
Downside [member] |
Member |
|
|
ck0001087711:DownsideMember |
| 2226 |
Upside [member] |
Member |
|
|
ck0001087711:UpsideMember |
| 2227 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 2228 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 2229 |
Retail banking Corporate and Commercial Banking and Corporate Centre [member] |
Member |
|
|
ck0001087711:RetailBankingCorporateAndCommercialBankingAndCorporateCentreMember |
| 2230 |
Corporate and investment banking [member] |
Member |
|
|
ck0001087711:CorporateAndInvestmentBankingMember |
| 2231 |
Disclosure of probability weightings of scenarios [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfProbabilityWeightingsOfScenariosLineItems |
| 2232 |
ECL |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:ExpectedCreditLossesAllowance |
| 2233 |
1177 - Disclosure - Accounting Policies - Summary of Increase (Decrease in Profit Before Tax (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureAccountingPoliciesSummaryOfIncreaseDecreaseInProfitBeforeTax |
| 2234 |
Implied Table |
Table |
* |
* |
implied:Table |
| 2235 |
Disclosure - Accounting Policies - Summary of Increase (Decrease in Profit Before Tax [Abstract] |
Abstract |
|
|
ck0001087711:DisclosureAccountingPoliciesSummaryOfIncreaseDecreaseInProfitBeforeTaxAbstract |
| 2236 |
Increase in profit before tax due to 20 percentage increase in HPI rate |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:ProfitBeforeTaxDueToTwentyPercentageIncreaseInHpiRate |
| 2237 |
Increase in profit before tax due to 10 percentage increase in HPI rate |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:ProfitBeforeTaxDueToTenPercentageIncreaseInHpiRate |
| 2238 |
Decrease in profit before tax due to 10 percentage decrease in HPI rate |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:ProfitBeforeTaxDueToTenPercentageDecreaseInHpiRate |
| 2239 |
Decrease in profit before tax due to 20 percentage decrease in HPI rate |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:ProfitBeforeTaxDueToTwentyPercentageDecreaseInHpiRate |
| 2240 |
1178 - Disclosure - Segments - Additional Information (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureSegmentsAdditionalInformation |
| 2241 |
Disclosure of operating segments [table] |
Table |
* |
* |
ifrs-full:DisclosureOfOperatingSegmentsTable |
| 2242 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 2243 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 2244 |
Retail banking [member] |
Member |
|
|
ck0001087711:RetailBankingMember |
| 2245 |
Corporate and commercial banking [member] |
Member |
|
|
ck0001087711:CorporateAndCommercialBankingMember |
| 2246 |
Corporate and investment banking [member] |
Member |
|
|
ck0001087711:CorporateAndInvestmentBankingMember |
| 2247 |
Range [axis] |
Axis |
|
|
ifrs-full:RangeAxis |
| 2248 |
Ranges [member] |
Member |
|
|
ifrs-full:RangesMember |
| 2249 |
Bottom of Range [member] |
Member |
|
|
ifrs-full:BottomOfRangeMember |
| 2250 |
Top of Range [member] |
Member |
|
|
ifrs-full:TopOfRangeMember |
| 2251 |
Disclosure of operating segments [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfOperatingSegmentsLineItems |
| 2252 |
Turnover from Small business customers |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:TurnoverFromSmallBusinessCustomers |
| 2253 |
Annual turnover of business |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:TurnoverFromMediumAndLargeBusinessCustomers |
| 2254 |
1179 - Disclosure - Segments - Summary of Results by Segment (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureSegmentsSummaryOfResultsBySegment |
| 2255 |
Disclosure of operating segments [table] |
Table |
* |
* |
ifrs-full:DisclosureOfOperatingSegmentsTable |
| 2256 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 2257 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 2258 |
Retail banking [member] |
Member |
|
|
ck0001087711:RetailBankingMember |
| 2259 |
Corporate and commercial banking [member] |
Member |
|
|
ck0001087711:CorporateAndCommercialBankingMember |
| 2260 |
Corporate and investment banking [member] |
Member |
|
|
ck0001087711:CorporateAndInvestmentBankingMember |
| 2261 |
Corporate centre [member] |
Member |
|
|
ck0001087711:CorporateCentreMember |
| 2262 |
Segment consolidation items [axis] |
Axis |
|
|
ifrs-full:SegmentConsolidationItemsAxis |
| 2263 |
Entity's total for segment consolidation items [member] |
Member |
|
|
ifrs-full:EntitysTotalForSegmentConsolidationItemsMember |
| 2264 |
Elimination of Intersegment Amounts [member] |
Member |
|
|
ifrs-full:EliminationOfIntersegmentAmountsMember |
| 2265 |
Disclosure of operating segments [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfOperatingSegmentsLineItems |
| 2266 |
Net interest income |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:InterestRevenueExpense |
| 2267 |
Non-interest income |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:NonInterestIncomeExpense |
| 2268 |
Total operating income |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:AggregateOperatingIncomeExpense |
| 2269 |
Operating expenses before credit impairment losses, provisions and charges |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:OperatingExpensesBeforeCreditImpairmentLossesProvisionsAndCharges |
| 2270 |
Credit impairment (losses)/releases |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:ImpairmentLossOnFinancialAssets |
| 2271 |
Provisions for other liabilities and charges |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:ProvisionsForOtherLiabilitiesAndCharges |
| 2272 |
Total operating credit impairment losses, provisions and (charges)/releases |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:AggregateOperatingCreditImpairmentLossesProvisionsAndCharges |
| 2273 |
Profit before tax |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:ProfitLossBeforeTax |
| 2274 |
Revenue from external customers |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:RevenueFromContractsWithCustomers |
| 2275 |
Inter-segment revenue |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:RevenueAndOperatingIncome |
| 2276 |
Total operating income |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:AggregateOperatingIncomeExpense |
| 2277 |
Revenue from external customers includes the following fee and commission income disaggregated by income type: |
Abstract |
|
|
ifrs-full:ReceivablesFromContractsWithCustomersAbstract |
| 2278 |
- Current account and debit card fees |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:IncomeFromCurrentAccountAndDebitCardFees |
| 2279 |
- Insurance, protection and investments |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:IncomeFromInsuranceProtectionAndInvestments |
| 2280 |
- Credit cards |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:IncomeFromCreditCards |
| 2281 |
- Non-banking and other fees(3) |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:IncomeFromNonBankingAndOtherFees |
| 2282 |
Total fee and commission income |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:FeeAndCommissionIncome |
| 2283 |
Fee and commission expense |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:FeeAndCommissionExpense |
| 2284 |
Net fee and commission income |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:FeeAndCommissionIncomeExpenseNet |
| 2285 |
Customer loans |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:CustomerLoansNet |
| 2286 |
Total assets |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:Assets |
| 2287 |
Customer deposits |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:CustomerDepositsNet |
| 2288 |
Total liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:Liabilities |
| 2289 |
Average number of staff |
Concept (Decimal) |
For Period |
|
ifrs-full:AverageNumberOfEmployees |
| 2290 |
1180 - Disclosure - Segments - Summary of Results by Segment (Parenthetical) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureSegmentsSummaryOfResultsBySegmentParenthetical |
| 2291 |
Disclosure of operating segments [table] |
Table |
* |
* |
ifrs-full:DisclosureOfOperatingSegmentsTable |
| 2292 |
Reclassified items [axis] |
Axis |
|
|
ifrs-full:ReclassifiedItemsAxis |
| 2293 |
Reclassified items [member] |
Member |
|
|
ifrs-full:ReclassifiedItemsMember |
| 2294 |
Reclassification and presentational changes [member] |
Member |
|
|
ck0001087711:ReclassificationAndPresentationalChangesMember |
| 2295 |
Segments [axis] |
Axis |
|
|
ifrs-full:SegmentsAxis |
| 2296 |
Segments [member] |
Member |
|
|
ifrs-full:SegmentsMember |
| 2297 |
Corporate centre [member] |
Member |
|
|
ck0001087711:CorporateCentreMember |
| 2298 |
Disclosure of operating segments [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfOperatingSegmentsLineItems |
| 2299 |
Profit before tax |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:ProfitLossBeforeTax |
| 2300 |
Customer loans |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:CustomerLoansNet |
| 2301 |
Customer deposits |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:CustomerDepositsNet |
| 2302 |
1181 - Disclosure - Net Interest Income - Summary of Net Interest Income (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureNetInterestIncomeSummaryOfNetInterestIncome |
| 2303 |
Implied Table |
Table |
* |
* |
implied:Table |
| 2304 |
Analysis of income and expense [abstract] |
Abstract |
|
|
ifrs-full:AnalysisOfIncomeAndExpenseAbstract |
| 2305 |
Interest and similar income: |
Abstract |
|
|
ck0001087711:InterestAndSimilarIncomeAbstract |
| 2306 |
Loans and advances to customers |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:InterestIncomeOnLoansAndAdvancesToCustomers |
| 2307 |
Loans and advances to banks |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:InterestIncomeOnLoansAndAdvancesToBanks |
| 2308 |
Reverse repurchase agreements - non trading |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:InterestIncomeOnReverseRepurchaseAgreementsAndCashCollateralOnSecuritiesBorrowed |
| 2309 |
Other |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:InterestIncomeOnOtherFinancialAssets |
| 2310 |
Total interest and similar income |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:RevenueFromInterest |
| 2311 |
Interest expense and similar charges: |
Abstract |
|
|
ck0001087711:InterestExpenseAndSimilarChargesAbstract |
| 2312 |
Deposits by customers |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:InterestExpenseOnDepositsFromCustomers |
| 2313 |
Deposits by banks |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:InterestExpenseOnDepositsFromBanks |
| 2314 |
Repurchase agreements - non trading |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:InterestExpenseOnRepurchaseAgreementsAndCashCollateralOnSecuritiesLent |
| 2315 |
Debt securities in issue |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:InterestExpenseOnDebtInstrumentsIssued |
| 2316 |
Subordinated liabilities |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:InterestExpenseOnSubordinatedLiabilities |
| 2317 |
Other |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:InterestExpenseOnOtherFinancialLiabilities |
| 2318 |
Total interest expense and similar charges |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:InterestExpense |
| 2319 |
Net interest income |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:InterestRevenueExpense |
| 2320 |
1182 - Disclosure - Net Interest Income - Summary of Net Interest Income (Parenthetical) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureNetInterestIncomeSummaryOfNetInterestIncomeParenthetical |
| 2321 |
Implied Table |
Table |
* |
* |
implied:Table |
| 2322 |
Analysis of income and expense [abstract] |
Abstract |
|
|
ifrs-full:AnalysisOfIncomeAndExpenseAbstract |
| 2323 |
Interest income on financial assets at fair value through other comprehensive income |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:InterestIncomeForFinancialAssetsNotAtFairValueThroughProfitOrLoss |
| 2324 |
Interest expense on financial assets at fair value through other comprehensive income |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:InterestExpenseNotAtFairValueThroughProfitOrLoss |
| 2325 |
1183 - Disclosure - Net Interest Income - Additional Information (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureNetInterestIncomeAdditionalInformation |
| 2326 |
Implied Table |
Table |
* |
* |
implied:Table |
| 2327 |
Interest And Similar Income [abstract] |
Abstract |
|
|
ck0001087711:InterestAndSimilarIncomeAbstract |
| 2328 |
Interest and similar income on impaired loans |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:InterestIncomeOnImpairedFinancialAssetsAccrued |
| 2329 |
1184 - Disclosure - Net Fee and Commission Income - Summary of Net Fee and Commission Income (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureNetFeeAndCommissionIncomeSummaryOfNetFeeAndCommissionIncome |
| 2330 |
Disclosure of disaggregation of revenue from contracts with customers [table] |
Table |
* |
* |
ifrs-full:DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersTable |
| 2331 |
Products and services [axis] |
Axis |
|
|
ifrs-full:ProductsAndServicesAxis |
| 2332 |
Products and services [member] |
Member |
|
|
ifrs-full:ProductsAndServicesMember |
| 2333 |
Current account and debit card fees [member] |
Member |
|
|
ck0001087711:CurrentAccountAndDebitCardFeesMember |
| 2334 |
Insurance, protection and investments [member] |
Member |
|
|
ck0001087711:InsuranceProtectionAndInvestmentsMember |
| 2335 |
Credit cards [member] |
Member |
|
|
ck0001087711:CreditCardsMember |
| 2336 |
Non-banking and other fees [member] |
Member |
|
|
ck0001087711:NonbankingAndOtherFeesMember |
| 2337 |
Net Fee And Commission Income [Line Items] |
LineItems |
|
|
ck0001087711:NetFeeAndCommissionIncomeLineItems |
| 2338 |
Fee and commission income |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:FeeAndCommissionIncome |
| 2339 |
Fee and commission expense |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:FeeAndCommissionExpense |
| 2340 |
Net fee and commission income |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:FeeAndCommissionIncomeExpense |
| 2341 |
1185 - Disclosure - Net Trading and Other Income - Summary of Net Trading and Other Income (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureNetTradingAndOtherIncomeSummaryOfNetTradingAndOtherIncome |
| 2342 |
Implied Table |
Table |
* |
* |
implied:Table |
| 2343 |
Net Trading And Other Income [abstract] |
Abstract |
|
|
ck0001087711:NetTradingAndOtherIncomeAbstract |
| 2344 |
Net trading and funding of other items by the trading book |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:OtherTradingIncomeExpense |
| 2345 |
Net (losses)/ gains on other financial assets at fair value through profit or loss |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:GainsLossesOnOtherFinancialAssetsAtFairValueThroughProfitOrLoss |
| 2346 |
Net (losses)/gains on other financial liabilities at fair value through profit or loss |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:GainsLossesOnOtherFinancialLiabilitiesAtFairValueThroughProfitOrLoss |
| 2347 |
Net losses on derivatives managed with assets/liabilities held at fair value through profit or loss |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:GainsLossesOnChangeInFairValueOfDerivatives |
| 2348 |
Hedge ineffectiveness |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:GainLossOnHedgeIneffectiveness |
| 2349 |
Net profit on sale of available-for-sale assets |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:GainsLossesFromDisposalOfAvailableForSaleFinancialAssets |
| 2350 |
Net profit on sale of financial assets at fair value through other comprehensive income |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:GainsLossesOnSaleFromDisposalOfFinancialAssetsAtFairValueThroughOtherComprehensiveIncome |
| 2351 |
Net income from operating lease assets |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:OperatingLeaseIncome |
| 2352 |
Other |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:OtherIncome |
| 2353 |
Net trading and other income |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:NetTradingAndOtherIncome |
| 2354 |
1186 - Disclosure - Net Trading and Other Income - Additional Information (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureNetTradingAndOtherIncomeAdditionalInformation |
| 2355 |
Disclosure of Subordinated Liabilities [table] |
Table |
* |
* |
ck0001087711:DisclosureOfSubordinatedLiabilitiesTable |
| 2356 |
Legal entity [axis] |
Axis |
|
|
dei:LegalEntityAxis |
| 2357 |
Entity [Domain] |
Member |
|
|
dei:EntityDomain |
| 2358 |
Vocalink Holdings Limited [member] |
Member |
|
|
ck0001087711:VocalinkHoldingsLimitedMember |
| 2359 |
Visa Europe Ltd [member] |
Member |
|
|
ck0001087711:VisaEuropeLtdMember |
| 2360 |
Types of Financial Liabilities [Axis] |
Axis |
|
|
ifrs-full:TypesOfFinancialLiabilitiesAxis |
| 2361 |
Financial liabilities, type [member] |
Member |
|
|
ifrs-full:FinancialLiabilitiesTypeMember |
| 2362 |
7.375% 20 Year Step-up Perpetual Callable Subordinated Notes [member] |
Member |
|
|
ck0001087711:SevenPointThreeSevenFivePercentTwentyYearStepupPerpetualCallableSubordinatedNotesMember |
| 2363 |
Non-Cumulative Trust Preferred Securities [member] |
Member |
|
|
ck0001087711:NoncumulativeTrustPreferredSecuritiesMember |
| 2364 |
Disclosure of subordinated liabilities [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfSubordinatedLiabilitiesLineItems |
| 2365 |
Fair value gains/(losses) on net trading and funding of other items by trading book |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:FairValueLossesOnNetTradingAndFundingOfOtherItemsByTradingBook |
| 2366 |
(Losses)/gains on equity derivatives trading desk |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:GainsOnEquityDerivativesTradingDesk |
| 2367 |
Net gain on equity index-linked deposits and the related economic hedges |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:NetGainOnEquityIndexlinkedDepositsAndTheRelatedEconomicHedges |
| 2368 |
Gain on sale of shares |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:GainOnSaleOfEquitySecurities |
| 2369 |
Percentage of notes purchased and redeemed |
Concept (Percent) |
As Of |
|
ck0001087711:RedemptionPercentage |
| 2370 |
Interest rate |
Concept (Percent) |
As Of |
|
ifrs-full:BorrowingsInterestRate |
| 2371 |
Maturity year |
Concept (Text/String) |
For Period |
|
ck0001087711:CallDateOfUndatedSubordinatedLiabilities |
| 2372 |
Exchange rate differences recognised |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss |
| 2373 |
Principally offset from cash flow hedge reserve |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:ReclassificationAdjustmentsOnCashFlowHedgesBeforeTax |
| 2374 |
1187 - Disclosure - Operating Expenses Before Credit Impairment Losses, Provisions and Charges - Summary of Operating Expenses Before Credit Impairment Losses, Provisions and Charges (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureOperatingExpensesBeforeCreditImpairmentLossesProvisionsAndChargesSummaryOfOperatingExpensesBeforeCreditImpairmentLossesProvisionsAndCharges |
| 2375 |
Implied Table |
Table |
* |
* |
implied:Table |
| 2376 |
Expenses by nature [abstract] |
Abstract |
|
|
ifrs-full:ExpenseByNatureAbstract |
| 2377 |
Staff costs: |
Abstract |
|
|
ifrs-full:ClassesOfEmployeeBenefitsExpenseAbstract |
| 2378 |
Wages and salaries |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:WagesAndSalaries |
| 2379 |
Performance-related payments |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:PerformanceRelatedPayments |
| 2380 |
Social security costs |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:SocialSecurityContributions |
| 2381 |
Pensions costs - defined contribution plans |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:PostemploymentBenefitExpenseDefinedContributionPlans |
| 2382 |
Pensions costs - defined benefit plans |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:PostemploymentBenefitExpenseDefinedBenefitPlans |
| 2383 |
Other share-based payments |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:ExpenseFromSharebasedPaymentTransactionsWithEmployees |
| 2384 |
Other personnel costs |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:OtherEmployeeExpense |
| 2385 |
Employee benefits expense |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:EmployeeBenefitsExpense |
| 2386 |
Other administration expenses |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:OtherAdministrationExpenses |
| 2387 |
Depreciation, amortisation and impairment |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:DepreciationAmortisationAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss |
| 2388 |
Total operating expenses before impairment losses, provisions and charges |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:OperatingExpensesBeforeCreditImpairmentLossesProvisionsAndCharges |
| 2389 |
1188 - Disclosure - Operating Expenses Before Credit Impairment Losses, Provisions and Charges - Summary of Deferred Performance Awards (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureOperatingExpensesBeforeCreditImpairmentLossesProvisionsAndChargesSummaryOfDeferredPerformanceAwards |
| 2390 |
Disclosure of Deferred Performance Awards [table] |
Table |
* |
* |
ck0001087711:DisclosureOfDeferredPerformanceAwardsTable |
| 2391 |
Maturity [axis] |
Axis |
|
|
ifrs-full:MaturityAxis |
| 2392 |
Aggregated time bands [member] |
Member |
|
|
ifrs-full:AggregatedTimeBandsMember |
| 2393 |
Not Later Than 1 Year [member] |
Member |
|
|
ifrs-full:NotLaterThanOneYearMember |
| 2394 |
More than One Year [member] |
Member |
|
|
ifrs-full:LaterThanOneYearMember |
| 2395 |
Year In Which Awards Arose [axis] |
Axis |
|
|
ck0001087711:YearInWhichAwardsAroseAxis |
| 2396 |
Year In Which Awards Arose [domain] |
Member |
|
|
ck0001087711:YearInWhichAwardsAroseDomain |
| 2397 |
Arising From Awards in Current Year [member] |
Member |
|
|
ifrs-full:CurrentMember |
| 2398 |
Arising From Awards in Prior Year [member] |
Member |
|
|
ck0001087711:PriorPeriodMember |
| 2399 |
Disclosure of deferred performance awards [line Items] |
LineItems |
|
|
ck0001087711:DisclosureOfDeferredPerformanceAwardsLineItems |
| 2400 |
Cash |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:PerformanceAwardsCashDeferred |
| 2401 |
Shares |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:PerformanceAwardsSharesDeferred |
| 2402 |
Deferred performance awards |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:PerformanceAwardsDeferred |
| 2403 |
1189 - Disclosure - Operating Expenses Before Credit Impairment Losses, Provisions and Charges - Summary of Amount of Bonus Awarded to Employees (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureOperatingExpensesBeforeCreditImpairmentLossesProvisionsAndChargesSummaryOfAmountOfBonusAwardedToEmployees |
| 2404 |
Disclosure of Amount of Bonus Awarded to Employees [table] |
Table |
* |
* |
ck0001087711:DisclosureOfAmountOfBonusAwardedToEmployeesTable |
| 2405 |
Maturity [axis] |
Axis |
|
|
ifrs-full:MaturityAxis |
| 2406 |
Aggregated time bands [member] |
Member |
|
|
ifrs-full:AggregatedTimeBandsMember |
| 2407 |
Not Later Than 1 Year [member] |
Member |
|
|
ifrs-full:NotLaterThanOneYearMember |
| 2408 |
More than One Year [member] |
Member |
|
|
ifrs-full:LaterThanOneYearMember |
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Disclosure of amount of bonus awarded to employees [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfAmountOfBonusAwardedToEmployeesLineItems |
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Cash award - not deferred |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:PerformanceAwardsCashNonDeferred |
| 2411 |
- deferred |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:PerformanceAwardsCashDeferred |
| 2412 |
Share awards - not deferred |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:PerformanceAwardsSharesNonDeferred |
| 2413 |
- deferred |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:PerformanceAwardsSharesDeferred |
| 2414 |
Total discretionary bonus |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:PerformanceAwards |
| 2415 |
1190 - Disclosure - Operating Expenses Before Credit Impairment Losses, Provisions and Charges - Additional Information (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureOperatingExpensesBeforeCreditImpairmentLossesProvisionsAndChargesAdditionalInformation |
| 2416 |
Disclosure of sensitivity analysis for actuarial assumptions [table] |
Table |
* |
* |
ifrs-full:DisclosureOfSensitivityAnalysisForActuarialAssumptionsTable |
| 2417 |
Categories of related parties [axis] |
Axis |
|
|
ifrs-full:CategoriesOfRelatedPartiesAxis |
| 2418 |
Entity's total for related parties [member] |
Member |
|
|
ifrs-full:EntitysTotalForRelatedPartiesMember |
| 2419 |
Santander UK plc [member] |
Member |
|
|
ck0001087711:SubsidiaryMember |
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Disclosure of Classes of employee benefits expense [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfClassesOfEmployeeBenefitsExpenseLineItems |
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Increase in liabilities |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:IncreaseDecreaseInLiabilities |
| 2422 |
Average number of full-time equivalent staff |
Concept (Decimal) |
For Period |
|
ifrs-full:AverageNumberOfEmployees |
| 2423 |
Impairment charge |
Concept (Monetary) |
For Period |
|
ifrs-full:ImpairmentLossRecognisedInProfitOrLossIntangibleAssetsOtherThanGoodwill |
| 2424 |
1191 - Disclosure - Audit and Other Services - Summary of Audit and Other Services (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureAuditAndOtherServicesSummaryOfAuditAndOtherServices |
| 2425 |
Implied Table |
Table |
* |
* |
implied:Table |
| 2426 |
Disclosure of finance income costs [abstract] |
Abstract |
|
|
ck0001087711:DisclosureOfFinanceIncomeCostsAbstract |
| 2427 |
Audit fees: |
Abstract |
|
|
ck0001087711:AuditFeesAbstract |
| 2428 |
Fees payable to the Company's auditor and its associates for the audit of the Santander UK group's annual accounts |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:AuditorsRemunerationForAuditServicesGroupAnnualAccounts |
| 2429 |
- Audit of the Santander UK group's subsidiaries |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:AuditorsRemunerationForAuditServicesGroupSubsidiaries |
| 2430 |
Total audit fees |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:AuditorsRemunerationForAuditServices |
| 2431 |
Non-audit fees: |
Abstract |
|
|
ck0001087711:NonAuditFeesAbstract |
| 2432 |
Audit-related assurance services |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:AuditorsRemunerationForNonAuditServicesAuditRelatedServices |
| 2433 |
Taxation compliance services |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:AuditorsRemunerationForTaxServices |
| 2434 |
Other assurance services |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:AuditorsRemunerationForOtherServices |
| 2435 |
Other non-audit services |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:AuditorRemunerationForOtherNonauditServices |
| 2436 |
Total non-audit fees |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:AuditorsRemunerationForNonAuditServices |
| 2437 |
1192 - Disclosure - Audit and Other Services - Summary of Audit and Other Services (Parenthetical) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureAuditAndOtherServicesSummaryOfAuditAndOtherServicesParenthetical |
| 2438 |
Disclosure of audit fees and non audit fees [table] |
Table |
* |
* |
ck0001087711:DisclosureOfAuditFeesAndNonAuditFeesTable |
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Products and services [axis] |
Axis |
|
|
ifrs-full:ProductsAndServicesAxis |
| 2440 |
Products and services [member] |
Member |
|
|
ifrs-full:ProductsAndServicesMember |
| 2441 |
Prior year audit services [member] |
Member |
|
|
ck0001087711:PriorYearAuditServicesMember |
| 2442 |
Disclosure of audit fees and non audit fees [Line Items] |
LineItems |
|
|
ck0001087711:DisclosureOfAuditFeesAndNonAuditFeesLineItems |
| 2443 |
Auditors fee |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:AuditorsRemuneration |
| 2444 |
Audit-related assurance services |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:AuditorsRemunerationForNonAuditServicesAuditRelatedServices |
| 2445 |
1193 - Disclosure - Audit and Other Services - Additional Information (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureAuditAndOtherServicesAdditionalInformation |
| 2446 |
Disclosure of audit fees and non audit fees [table] |
Table |
* |
* |
ck0001087711:DisclosureOfAuditFeesAndNonAuditFeesTable |
| 2447 |
Categories of related parties [axis] |
Axis |
|
|
ifrs-full:CategoriesOfRelatedPartiesAxis |
| 2448 |
Entity's total for related parties [member] |
Member |
|
|
ifrs-full:EntitysTotalForRelatedPartiesMember |
| 2449 |
Corporate and Other Borrowers [member] |
Member |
|
|
ck0001087711:CorporateAndOtherBorrowersMember |
| 2450 |
Disclosure of audit fees and non audit fees [Line Items] |
LineItems |
|
|
ck0001087711:DisclosureOfAuditFeesAndNonAuditFeesLineItems |
| 2451 |
Audit-related services related to services performed in connection with the statutory and regulatory filings |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:AuditorsRemunerationForNonAuditServicesAuditRelatedServicesStatutoryAndRegulatoryFilings |
| 2452 |
Audit-related services related to services performed in connection with securitisation, debt issuance and related work and reporting to prudential and conduct regulators |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:AuditorsRemunerationForNonAuditServicesAuditRelatedServicesSecuritisationDebtIssuanceAndRelatedWorkAndReportingToPrudentialAndConductRegulators |
| 2453 |
Audit fees payable for statutory audit |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:AuditorsRemunerationForAuditServices |
| 2454 |
1194 - Disclosure - Credit Impairment Losses and Provisions - Summary of Impairment Losses and Provisions (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditImpairmentLossesAndProvisionsSummaryOfImpairmentLossesAndProvisions |
| 2455 |
Implied Table |
Table |
* |
* |
implied:Table |
| 2456 |
Disclosure of credit impairment loss and provisions [abstract] |
Abstract |
|
|
ck0001087711:DisclosureOfCreditImpairmentLossAndProvisionsAbstract |
| 2457 |
Loans and advances to customers (See Note 14) |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:CreditImpairmentLossesOnLoansAndAdvancesToCustomer |
| 2458 |
Recoveries of loans and advances, net of collection costs (See Note 14) |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:FinancialAssetsPostWriteoffRecoveries |
| 2459 |
Off-balance sheet exposures (See Note 30) |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:OffBalanceSheetCreditExposures |
| 2460 |
Impairment loss on financial assets |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:ImpairmentLossOnFinancialAssets |
| 2461 |
Provisions for other liabilities and charges (excluding off-balance sheet credit exposures) (See Note 30) |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:ProvisionsForOtherLiabilitiesAndChargesExcludingOffBalanceSheetCreditExposures |
| 2462 |
Provisions for RV and voluntary termination (See Note 14) |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:ProvisionsForResidualValueAndVoluntaryTermination |
| 2463 |
Provisions for other liabilities and charges |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:ProvisionsForOtherLiabilitiesAndCharges |
| 2464 |
Total operating impairment losses, provisions and charges |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:AggregateOperatingCreditImpairmentLossesProvisionsAndCharges |
| 2465 |
1195 - Disclosure - Credit Impairment Losses and Provisions - Additional Information (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureCreditImpairmentLossesAndProvisionsAdditionalInformation |
| 2466 |
Implied Table |
Table |
* |
* |
implied:Table |
| 2467 |
Disclosure of credit impairment loss and provisions [abstract] |
Abstract |
|
|
ck0001087711:DisclosureOfCreditImpairmentLossAndProvisionsAbstract |
| 2468 |
Impairment losses on loans and advances to banks |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:CreditImpairmentLossesOnLoansAndAdvancesToBank |
| 2469 |
Impairment losses on Non-trading reverse repurchase agreements |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:CreditImpairmentLossesOnNontradingReverseRepurchaseAgreements |
| 2470 |
Impairment losses on other financial assets at amortised cost |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:CreditImpairmentLossesOnOtherFinancialAssetsAtAmortisedCost |
| 2471 |
Impairment losses on financial assets at FVOCI |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:CreditImpairmentLossesOnFinancialAssetsAtFVOCI |
| 2472 |
1196 - Disclosure - Taxation - Disclosure of Tax on Profit (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureTaxationDisclosureOfTaxOnProfit |
| 2473 |
Implied Table |
Table |
* |
* |
implied:Table |
| 2474 |
Major components of tax expense (income) [abstract] |
Abstract |
|
|
ifrs-full:MajorComponentsOfTaxExpenseIncomeAbstract |
| 2475 |
Current tax: |
Abstract |
|
|
ifrs-full:CurrentTaxExpenseIncomeAndAdjustmentsForCurrentTaxOfPriorPeriodsAbstract |
| 2476 |
UK corporation tax on profit for the year |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:CurrentTaxExpenseIncome |
| 2477 |
Adjustments in respect of prior years |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:AdjustmentsForCurrentTaxOfPriorPeriod |
| 2478 |
Total current tax |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:CurrentTaxExpenseIncomeAndAdjustmentsForCurrentTaxOfPriorPeriods |
| 2479 |
Deferred tax: |
Abstract |
|
|
ifrs-full:DeferredTaxExpenseIncomeAbstract |
| 2480 |
Charge/(credit) for the year |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:DeferredTaxExpenseIncomeRelatingToOriginationAndReversalOfTemporaryDifferences |
| 2481 |
Adjustments in respect of prior years |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:AdjustmentsForDeferredTaxOfPriorPeriods |
| 2482 |
Total deferred tax |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:DeferredTaxExpenseIncome |
| 2483 |
Tax on profit |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:IncomeTaxExpenseContinuingOperations |
| 2484 |
1197 - Disclosure - Taxation - Additional Information (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureTaxationAdditionalInformation |
| 2485 |
Income Tax Expense Benefits [table] |
Table |
* |
* |
ck0001087711:IncomeTaxExpenseBenefitsTable |
| 2486 |
Non-adjusting events after reporting period [axis] |
Axis |
|
|
ifrs-full:NonadjustingEventsAfterReportingPeriodAxis |
| 2487 |
Non-adjusting Events After Reporting Period [member] |
Member |
|
|
ifrs-full:NonadjustingEventsMember |
| 2488 |
Finance (No.2) Act 2015 [member] |
Member |
|
|
ck0001087711:FinanceAct2015Member |
| 2489 |
Finance (No.2) Act 2016 [member] |
Member |
|
|
ck0001087711:FinanceAct2016Member |
| 2490 |
Range [axis] |
Axis |
|
|
ifrs-full:RangeAxis |
| 2491 |
Ranges [member] |
Member |
|
|
ifrs-full:RangesMember |
| 2492 |
Top of Range [member] |
Member |
|
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ifrs-full:TopOfRangeMember |
| 2493 |
Bottom of Range [member] |
Member |
|
|
ifrs-full:BottomOfRangeMember |
| 2494 |
Categories of related parties [axis] |
Axis |
|
|
ifrs-full:CategoriesOfRelatedPartiesAxis |
| 2495 |
Entity's total for related parties [member] |
Member |
|
|
ifrs-full:EntitysTotalForRelatedPartiesMember |
| 2496 |
Santandar UK plc [member] |
Member |
|
|
ck0001087711:CompanyMember |
| 2497 |
Temporary difference, unused tax losses and unused tax credits [axis] |
Axis |
|
|
ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis |
| 2498 |
Temporary difference, unused tax losses and unused tax credits [member] |
Member |
|
|
ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember |
| 2499 |
Banking Entities [member] |
Member |
|
|
ck0001087711:BankingEntitiesMember |
| 2500 |
Non-banking Entities [member] |
Member |
|
|
ck0001087711:NonBankingEntitiesMember |
| 2501 |
Corporation Tax Rate in 2020 [member] |
Member |
|
|
ck0001087711:CorporationTaxRateIn2020Member |
| 2502 |
Deferred Tax Assets That Rely on Future Profitability Excluding Timing Differences [member] |
Member |
|
|
ck0001087711:DeferredTaxAssetMember |
| 2503 |
Income Tax Expense Benefits [line items] |
LineItems |
|
|
ck0001087711:IncomeTaxExpenseBenefitsLineItems |
| 2504 |
Applicable tax rate |
Concept (Percent) |
For Period |
|
ifrs-full:ApplicableTaxRate |
| 2505 |
Bank corporation tax surcharge |
Concept (Percent) |
For Period |
|
ck0001087711:BankCorporationTaxSurcharge |
| 2506 |
Effective tax rate |
Concept (Percent) |
For Period |
|
ifrs-full:AverageEffectiveTaxRate |
| 2507 |
Recognised capital losses carried forward |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:RecognisedUKCapitalLossesCarriedForward |
| 2508 |
Unrecognised capital losses carried forward |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:UnrecognisedCapitalLossesCarriedForward |
| 2509 |
Net operating losses carried forward |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:NetUSOperatingLossesCarriedForward |
| 2510 |
1198 - Disclosure - Taxation - Schedule of Tax on Profit Before Tax Differs from Theoretical Amount that Arise Using Basic Corporation Tax Rate (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureTaxationScheduleOfTaxOnProfitBeforeTaxDiffersFromTheoreticalAmountThatAriseUsingBasicCorporationTaxRate |
| 2511 |
Implied Table |
Table |
* |
* |
implied:Table |
| 2512 |
Reconciliation of accounting profit multiplied by applicable tax rates [abstract] |
Abstract |
|
|
ifrs-full:ReconciliationOfAccountingProfitMultipliedByApplicableTaxRatesAbstract |
| 2513 |
Profit before tax |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:ProfitLossBeforeTax |
| 2514 |
Tax calculated at a tax rate of 19% (2017: 19.25%, 2016: 20.00%) |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:TaxExpenseIncomeAtApplicableTaxRate |
| 2515 |
Bank surcharge on profits |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:TaxEffectOfBankCorporationTaxSurchargeOnProfits |
| 2516 |
Non-deductible preference dividends paid |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:TaxEffectOfNonDeductiblePreferenceDividendsPaid |
| 2517 |
Non-deductible UK Bank Levy |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:TaxEffectOfNonDeductibleBankLevy |
| 2518 |
Non-deductible conduct remediation, fines and penalties |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:TaxEffectOfNonDeductibleConductRemediationFinesAndPenalties |
| 2519 |
Other non-deductible costs and non-taxable income |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:OtherTaxEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome |
| 2520 |
Effect of change in tax rate on deferred tax provision |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:TaxEffectFromChangeInTaxRate |
| 2521 |
Adjustment to prior year provisions |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:TaxEffectOfPriorYearAdjustments |
| 2522 |
Tax charge |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:IncomeTaxExpenseContinuingOperations |
| 2523 |
1199 - Disclosure - Taxation - Schedule of Tax on Profit Before Tax Differs from Theoretical Amount that Arise Using Basic Corporation Tax Rate (Parenthetical) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureTaxationScheduleOfTaxOnProfitBeforeTaxDiffersFromTheoreticalAmountThatAriseUsingBasicCorporationTaxRateParenthetical |
| 2524 |
Implied Table |
Table |
* |
* |
implied:Table |
| 2525 |
Reconciliation of accounting profit multiplied by applicable tax rates [abstract] |
Abstract |
|
|
ifrs-full:ReconciliationOfAccountingProfitMultipliedByApplicableTaxRatesAbstract |
| 2526 |
Standard tax rate |
Concept (Percent) |
For Period |
|
ifrs-full:ApplicableTaxRate |
| 2527 |
1200 - Disclosure - Taxation - Disclosure of Movements in Current Tax Assets and Liabilities (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureTaxationDisclosureOfMovementsInCurrentTaxAssetsAndLiabilities |
| 2528 |
Implied Table |
Table |
* |
* |
implied:Table |
| 2529 |
Current Tax Assets and Liabilities [abstract] |
Abstract |
|
|
ck0001087711:CurrentTaxAssetsAndLiabilitiesAbstract |
| 2530 |
Assets |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:CurrentTaxAssets |
| 2531 |
Liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:CurrentTaxLiabilities |
| 2532 |
Beginning Balance |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:CurrentTaxLiabilityAsset |
| 2533 |
Income statement charge |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:CurrentTaxExpenseIncomeAndAdjustmentsForCurrentTaxOfPriorPeriods |
| 2534 |
Other comprehensive income credit/(charge) |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:CurrentTaxExpenseIncomeRecognisedInOtherComprehensiveIncome |
| 2535 |
Corporate income tax paid |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:IncomeTaxesPaidRefundClassifiedAsOperatingActivities |
| 2536 |
Other movements |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:IncreaseDecreaseInOtherCurrentTaxLiabilityAsset |
| 2537 |
Ending Balance |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:CurrentTaxLiabilityAsset |
| 2538 |
Assets |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:CurrentTaxAssets |
| 2539 |
Liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:CurrentTaxLiabilities |
| 2540 |
1201 - Disclosure - Taxation - Disclosure of Deferred Tax Assets and Liabilities Including Movement in Deferred Tax Account (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureTaxationDisclosureOfDeferredTaxAssetsAndLiabilitiesIncludingMovementInDeferredTaxAccount |
| 2541 |
Disclosure of temporary difference, unused tax losses and unused tax credits [table] |
Table |
* |
* |
ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable |
| 2542 |
Temporary difference, unused tax losses and unused tax credits [axis] |
Axis |
|
|
ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis |
| 2543 |
Temporary difference, unused tax losses and unused tax credits [member] |
Member |
|
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ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember |
| 2544 |
Fair Value of Financial Instruments [member] |
Member |
|
|
ck0001087711:FairValueOfFinancialInstrumentsMember |
| 2545 |
Pension Remeasurement [member] |
Member |
|
|
ck0001087711:PensionRemeasurementMember |
| 2546 |
Cash Flow Hedges [member] |
Member |
|
|
ifrs-full:CashFlowHedgesMember |
| 2547 |
Available-for-Sale [member] |
Member |
|
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ck0001087711:AvailableForSaleMember |
| 2548 |
Fair Value Reserves Related to Gains or Losses on Cash Flow Hedges [Member] |
Member |
|
|
ck0001087711:FairValueReserveMember |
| 2549 |
Tax Losses Carried Forward [member] |
Member |
|
|
ifrs-full:UnusedTaxLossesMember |
| 2550 |
Accelerated Tax Depreciation [member] |
Member |
|
|
ck0001087711:AcceleratedTaxDepreciationMember |
| 2551 |
Other temporary differences [member] |
Member |
|
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ifrs-full:OtherTemporaryDifferencesMember |
| 2552 |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems |
| 2553 |
Beginning Balance |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:DeferredTaxLiabilityAsset |
| 2554 |
Adoption of IFRS 9 (see Note 1) |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:DeferredTaxLiabilityAssetAdjustmentForAdoptionOfIfrs9 |
| 2555 |
Beginning Balance, After adoption of IFRS 9 |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:DeferredTaxLiabilityAssetAfterAdoptionOfIfrs9 |
| 2556 |
Income statement (charge)/credit |
Concept (Monetary) |
For Period |
|
ifrs-full:DeferredTaxExpenseIncomeRecognisedInProfitOrLoss |
| 2557 |
Transfers/reclassifications |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:IncreaseDecreaseThroughTransfersReclassifcationsDeferredTaxLiabilityAsset |
| 2558 |
Credited/(charged) to other comprehensive income |
Concept (Monetary) |
For Period |
|
ifrs-full:IncomeTaxRelatingToComponentsOfOtherComprehensiveIncome |
| 2559 |
Ending Balance |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:DeferredTaxLiabilityAsset |
| 2560 |
1202 - Disclosure - Dividends on Ordinary Shares - Disclosure of Dividends on Ordinary Shares Declared and Paid (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureDividendsOnOrdinarySharesDisclosureOfDividendsOnOrdinarySharesDeclaredAndPaid |
| 2561 |
Disclosure of Dividends on Ordinary Shares [table] |
Table |
* |
* |
ck0001087711:DisclosureOfDividendsOnOrdinarySharesTable |
| 2562 |
Dividend Payments Made [axis] |
Axis |
|
|
ck0001087711:DividendPaymentsMadeAxis |
| 2563 |
Dividend Payments Made [domain] |
Member |
|
|
ck0001087711:DividendPaymentsMadeDomain |
| 2564 |
First Interim [member] |
Member |
|
|
ck0001087711:FirstInterimMember |
| 2565 |
Second Interim [member] |
Member |
|
|
ck0001087711:SecondInterimMember |
| 2566 |
Third Interim [member] |
Member |
|
|
ck0001087711:ThirdInterimMember |
| 2567 |
Disclosure of Dividends on Ordinary Shares [Line Items] |
LineItems |
|
|
ck0001087711:DisclosureOfDividendsOnOrdinarySharesLineItems |
| 2568 |
Dividend per share |
Concept (Share) |
For Period |
|
ifrs-full:DividendsPaidOrdinarySharesPerShare |
| 2569 |
Dividends |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:DividendsRecognisedAsDistributionsToOwnersOfParent |
| 2570 |
1203 - Disclosure - Dividends on Ordinary Shares - Additional Information (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureDividendsOnOrdinarySharesAdditionalInformation |
| 2571 |
Implied Table |
Table |
* |
* |
implied:Table |
| 2572 |
Dividends On Ordinary Shares [abstract] |
Abstract |
|
|
ck0001087711:DividendsOnOrdinarySharesAbstract |
| 2573 |
Dividends declared |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:DividendsDeclaredOrdinaryShares |
| 2574 |
Dividends paid |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:DividendsPaidOrdinaryShares |
| 2575 |
Percentage of dividend on recurring earnings |
Concept (Percent) |
For Period |
|
ck0001087711:DividendOnRecurringEarningsPercentage |
| 2576 |
1204 - Disclosure - Trading Assets - Disclosure of Trading Assets (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureTradingAssetsDisclosureOfTradingAssets |
| 2577 |
Disclosure Of Financial Assets Held For Trading [table] |
Table |
* |
* |
ck0001087711:DisclosureOfFinancialAssetsHeldForTradingTable |
| 2578 |
Classes of financial assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialAssetsAxis |
| 2579 |
Financial assets, class [member] |
Member |
|
|
ifrs-full:FinancialAssetsMember |
| 2580 |
Securities Purchased Under Resale Agreements [member] |
Member |
|
|
ck0001087711:SecuritiesPurchasedUnderResaleAgreementsMember |
| 2581 |
Debt Securities [member] |
Member |
|
|
ifrs-full:DebtSecuritiesMember |
| 2582 |
Equity securities [member] |
Member |
|
|
ifrs-full:TradingEquitySecuritiesMember |
| 2583 |
Cash Collateral Associated with Trading Balances [member] |
Member |
|
|
ck0001087711:CashCollateralAssociatedWithTradingBalancesMember |
| 2584 |
Short-term loans [member] |
Member |
|
|
ck0001087711:ShortTermLoansMember |
| 2585 |
Disclosure of financial assets held for trading [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfFinancialAssetsHeldForTradingLineItems |
| 2586 |
Total trading assets |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTrading |
| 2587 |
1205 - Disclosure - Derivative Financial Instruments - Notional Amounts and Fair Values of Derivatives (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureDerivativeFinancialInstrumentsNotionalAmountsAndFairValuesOfDerivatives |
| 2588 |
Disclosure of detailed information about hedges [table] |
Table |
* |
* |
ifrs-full:DisclosureOfHedgeAccountingTable |
| 2589 |
Measurement [axis] |
Axis |
|
|
ifrs-full:MeasurementAxis |
| 2590 |
Aggregated measurement [member] |
Member |
|
|
ifrs-full:AggregatedMeasurementMember |
| 2591 |
Fair Value [member] |
Member |
|
|
ifrs-full:AtFairValueMember |
| 2592 |
Classes of financial assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialAssetsAxis |
| 2593 |
Financial assets, class [member] |
Member |
|
|
ifrs-full:FinancialAssetsMember |
| 2594 |
Exchange Rate Contracts [member] |
Member |
|
|
ifrs-full:CurrencySwapContractMember |
| 2595 |
Interest Rate Contracts [member] |
Member |
|
|
ifrs-full:InterestRateSwapContractMember |
| 2596 |
Equity and Credit Contracts [member] |
Member |
|
|
ck0001087711:EquityAndCreditContractsMember |
| 2597 |
Equity Investments [Member] |
Member |
|
|
ifrs-full:EquityInvestmentsMember |
| 2598 |
Netting adjustments [member] |
Member |
|
|
ck0001087711:NettingAdjustmentsMember |
| 2599 |
Types of hedges [axis] |
Axis |
|
|
ifrs-full:TypesOfHedgesAxis |
| 2600 |
Hedges [member] |
Member |
|
|
ifrs-full:TypesOfHedgesMember |
| 2601 |
Fair Value Hedges [member] |
Member |
|
|
ifrs-full:FairValueHedgesMember |
| 2602 |
Cash Flow Hedges [member] |
Member |
|
|
ifrs-full:CashFlowHedgesMember |
| 2603 |
Hedging instruments [axis] |
Axis |
|
|
ifrs-full:HedgingInstrumentsAxis |
| 2604 |
Hedging instruments [member] |
Member |
|
|
ifrs-full:HedgingInstrumentsMember |
| 2605 |
Derivatives Held for Trading [member] |
Member |
|
|
ck0001087711:DerivativesHeldForTradingMember |
| 2606 |
Derivatives Held for Hedging [member] |
Member |
|
|
ck0001087711:DerivativesHeldForHedgingMember |
| 2607 |
Disclosure of detailed information about hedges [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfHedgeAccountingLineItems |
| 2608 |
Derivative notional |
Concept (Monetary) |
As Of |
|
ifrs-full:NotionalAmount |
| 2609 |
Fair value assets |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:DerivativeFinancialAssets |
| 2610 |
Fair value liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:DerivativeFinancialLiabilities |
| 2611 |
1206 - Disclosure - Derivative Financial Instruments - Notional Amounts and Fair Values of Derivatives (Parenthetical) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureDerivativeFinancialInstrumentsNotionalAmountsAndFairValuesOfDerivativesParenthetical |
| 2612 |
Disclosure of detailed information about hedges [table] |
Table |
* |
* |
ifrs-full:DisclosureOfHedgeAccountingTable |
| 2613 |
Classes of financial assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialAssetsAxis |
| 2614 |
Financial assets, class [member] |
Member |
|
|
ifrs-full:FinancialAssetsMember |
| 2615 |
Derivative Assets [member] |
Member |
|
|
ck0001087711:DerivativeAssetsMember |
| 2616 |
Derivative Liabilities [Member] |
Member |
|
|
ck0001087711:DerivativeLiabilitiesMember |
| 2617 |
Disclosure of detailed information about hedges [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfHedgeAccountingLineItems |
| 2618 |
Cash collateral received that had been offset against the gross derivative assets |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:CashCollateralReceivedSubjectToEnforceableMasterNettingArrangementOrSimilarAgreementNotSetOffAgainstFinancialAssets |
| 2619 |
Cash collateral paid that had been offset against the gross derivative liabilities |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:CashCollateralPledgedSubjectToEnforceableMasterNettingArrangementOrSimilarAgreementNotSetOffAgainstFinancialLiabilities |
| 2620 |
1207 - Disclosure - Derivative Financial Instruments - Analysis of the Notional and Fair Values of Derivatives by Trading and Settlement Method (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureDerivativeFinancialInstrumentsAnalysisOfTheNotionalAndFairValuesOfDerivativesByTradingAndSettlementMethod |
| 2621 |
Disclosure of Analysis of Notional and Fair Values of Derivatives by Trading and Settlement Method [table] |
Table |
* |
* |
ck0001087711:DisclosureOfAnalysisOfNotionalAndFairValuesOfDerivativesByTradingAndSettlementMethodTable |
| 2622 |
Classes of financial instruments [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialInstrumentsAxis |
| 2623 |
Financial instruments, class [member] |
Member |
|
|
ifrs-full:ClassesOfFinancialInstrumentsMember |
| 2624 |
Traded on Recognised Exchanges [member] |
Member |
|
|
ck0001087711:TradedOnRecognisedExchangesMember |
| 2625 |
Settled by Central Counterparties [member] |
Member |
|
|
ck0001087711:SettledByCentralCounterpartiesMember |
| 2626 |
Not Settled by Central Counterparties [member] |
Member |
|
|
ck0001087711:NotSettledByCentralCounterpartiesMember |
| 2627 |
Traded Over the Counter [member] |
Member |
|
|
ck0001087711:TradedOverTheCounterMember |
| 2628 |
Classes of financial assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialAssetsAxis |
| 2629 |
Financial assets, class [member] |
Member |
|
|
ifrs-full:FinancialAssetsMember |
| 2630 |
Exchange Rate Contracts [member] |
Member |
|
|
ifrs-full:CurrencySwapContractMember |
| 2631 |
Interest Rate Contracts [member] |
Member |
|
|
ifrs-full:InterestRateSwapContractMember |
| 2632 |
Equity and Credit Contracts [member] |
Member |
|
|
ck0001087711:EquityAndCreditContractsMember |
| 2633 |
Analysis of notional and fair values of derivatives by trading and settlement method [line item] |
LineItems |
|
|
ck0001087711:DisclosureOfAnalysisOfNotionalAndFairValuesOfDerivativesByTradingAndSettlementMethodLineItems |
| 2634 |
Derivative notional |
Concept (Monetary) |
As Of |
|
ifrs-full:NotionalAmount |
| 2635 |
Assets traded over the counter |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:TradingDerivativeAssets |
| 2636 |
Liabilities traded over the counter |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:TradingDerivativeLiabilities |
| 2637 |
1208 - Disclosure - Derivative Financial Instruments - Summary of Fixed Rate Instruments Hedged (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureDerivativeFinancialInstrumentsSummaryOfFixedRateInstrumentsHedged |
| 2638 |
Disclosure of detailed information about hedged items [table] |
Table |
* |
* |
ifrs-full:DisclosureOfDetailedInformationAboutHedgedItemsTable |
| 2639 |
Hedging instruments [axis] |
Axis |
|
|
ifrs-full:HedgingInstrumentsAxis |
| 2640 |
Hedging instruments [member] |
Member |
|
|
ifrs-full:HedgingInstrumentsMember |
| 2641 |
Fixed rate mortgages [member] |
Member |
|
|
ck0001087711:FixedRateMortgagesMember |
| 2642 |
Fixed rate loans [member] |
Member |
|
|
ck0001087711:FixedRateLoansMember |
| 2643 |
Reverse repurchase agreements [member] |
Member |
|
|
ck0001087711:ReverseRepurchaseAgreementsMember |
| 2644 |
Investment assets [member] |
Member |
|
|
ck0001087711:InvestmentAssetsMember |
| 2645 |
Fixed rate savings [member] |
Member |
|
|
ck0001087711:FixedRateSavingsMember |
| 2646 |
Disclosure of detailed information about hedged items [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfDetailedInformationAboutHedgedItemsLineItems |
| 2647 |
Designated benchmark instrument rate |
Concept (Text/String) |
For Period |
|
ck0001087711:DesignatedBenchmarkInstrumentRate |
| 2648 |
Currency |
Concept (Text/String) |
For Period |
|
ck0001087711:UnderlyingCurrency |
| 2649 |
1209 - Disclosure - Derivative Financial Instruments - Summary of Maturity Profile and Average Price/Rate of Hedging Instruments Used in Hedging Strategies (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureDerivativeFinancialInstrumentsSummaryOfMaturityProfileAndAveragePriceRateOfHedgingInstrumentsUsedInHedgingStrategies |
| 2650 |
Disclosure of nature and extent of risks arising from financial instruments [table] |
Table |
* |
* |
ifrs-full:DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable |
| 2651 |
Maturity [axis] |
Axis |
|
|
ifrs-full:MaturityAxis |
| 2652 |
Aggregated time bands [member] |
Member |
|
|
ifrs-full:AggregatedTimeBandsMember |
| 2653 |
Less Than One Month [member] |
Member |
|
|
ck0001087711:LessThanOneMonthMember |
| 2654 |
Greater Than 1 and Less Than 3 Months [member] |
Member |
|
|
ifrs-full:LaterThanOneMonthAndNotLaterThanThreeMonthsMember |
| 2655 |
Later Than Three Months and Not Later Than One Year [member] |
Member |
|
|
ifrs-full:LaterThanThreeMonthsAndNotLaterThanOneYearMember |
| 2656 |
Later Than One Year and Not Later Than Five Years [member] |
Member |
|
|
ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember |
| 2657 |
Later Than Five Years [member] |
Member |
|
|
ifrs-full:LaterThanFiveYearsMember |
| 2658 |
Classes of financial assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialAssetsAxis |
| 2659 |
Financial assets, class [member] |
Member |
|
|
ifrs-full:FinancialAssetsMember |
| 2660 |
Interest Rate Contracts [member] |
Member |
|
|
ifrs-full:InterestRateSwapContractMember |
| 2661 |
Exchange Rate Contracts [member] |
Member |
|
|
ifrs-full:CurrencySwapContractMember |
| 2662 |
Types of risks [axis] |
Axis |
|
|
ifrs-full:TypesOfRisksAxis |
| 2663 |
Risks [member] |
Member |
|
|
ifrs-full:TypesOfRisksMember |
| 2664 |
Interest Rate Risks [member] |
Member |
|
|
ifrs-full:InterestRateRiskMember |
| 2665 |
Interest Rate And Foreign Currency Risk [member] |
Member |
|
|
ck0001087711:InterestRateAndForeignCurrencyRiskMember |
| 2666 |
Currency Risk [member] |
Member |
|
|
ifrs-full:CurrencyRiskMember |
| 2667 |
Types of hedges [axis] |
Axis |
|
|
ifrs-full:TypesOfHedgesAxis |
| 2668 |
Hedges [member] |
Member |
|
|
ifrs-full:TypesOfHedgesMember |
| 2669 |
Fair Value Hedges [member] |
Member |
|
|
ifrs-full:FairValueHedgesMember |
| 2670 |
Cash Flow Hedges [member] |
Member |
|
|
ifrs-full:CashFlowHedgesMember |
| 2671 |
Currency [Axis] |
Axis |
|
|
srt:CurrencyAxis |
| 2672 |
All Currencies [Domain] |
Member |
|
|
currency:AllCurrenciesDomain |
| 2673 |
United Kingdom, Pounds [member] |
Member |
|
|
currency:GBP |
| 2674 |
Euro Member Countries, Euro [member] |
Member |
|
|
currency:EUR |
| 2675 |
United States of America, Dollars [member] |
Member |
|
|
currency:USD |
| 2676 |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems |
| 2677 |
Nominal amount |
Concept (Monetary) |
As Of |
|
ifrs-full:NotionalAmount |
| 2678 |
Average GBP - JPY exchange rate |
Concept (Decimal) |
As Of |
|
ck0001087711:AverageGBPJPYExchangeRate |
| 2679 |
Average fixed interest rate |
Concept (Decimal) |
As Of |
|
ck0001087711:AverageFixedInterestRate |
| 2680 |
Average GBP - EUR exchange rate |
Concept (Decimal) |
As Of |
|
ck0001087711:AverageGBPEURExchangeRate |
| 2681 |
Average GBP - USD exchange rate |
Concept (Decimal) |
As Of |
|
ck0001087711:AverageGBPUSDExchangeRate |
| 2682 |
1210 - Disclosure - Derivative Financial Instruments - Summary of Net Gains Or Losses Arising from Fair Value and Cash Flow Hedges Included in Net Trading and Other Income (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureDerivativeFinancialInstrumentsSummaryOfNetGainsOrLossesArisingFromFairValueAndCashFlowHedgesIncludedInNetTradingAndOtherIncome |
| 2683 |
Disclosure of detailed information about hedges [table] |
Table |
* |
* |
ifrs-full:DisclosureOfHedgeAccountingTable |
| 2684 |
Types of hedges [axis] |
Axis |
|
|
ifrs-full:TypesOfHedgesAxis |
| 2685 |
Hedges [member] |
Member |
|
|
ifrs-full:TypesOfHedgesMember |
| 2686 |
Fair Value and Cash Flow Hedges [member] |
Member |
|
|
ck0001087711:FairValueAndCashFlowHedgesMember |
| 2687 |
Disclosure of detailed information about hedges [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfHedgeAccountingLineItems |
| 2688 |
Gains/(losses) on hedging instruments |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:GainsLossesOnHedgingInstrument |
| 2689 |
(Losses)/gains on hedged items attributable to hedged risks |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:GainsLossesOnHedgedItemAttributableToHedgedRisk |
| 2690 |
Fair value hedging ineffectiveness |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:GainLossOnChangeInFairValueOfHedgingInstrumentUsedAsBasisForRecognisingHedgeIneffectiveness |
| 2691 |
Cash flow hedging ineffectiveness |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:GainsLossesOnIneffectivenessOfCashFlowHedgesRecognisedInProfitOrLoss |
| 2692 |
Hedge ineffectiveness |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:GainLossOnHedgeIneffectiveness |
| 2693 |
1211 - Disclosure - Derivative Financial Instruments - Summary of Information About Hedging Ineffectiveness by Risk Category (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureDerivativeFinancialInstrumentsSummaryOfInformationAboutHedgingIneffectivenessByRiskCategory |
| 2694 |
Disclosure of detailed information about hedges [table] |
Table |
* |
* |
ifrs-full:DisclosureOfHedgeAccountingTable |
| 2695 |
Types of hedges [axis] |
Axis |
|
|
ifrs-full:TypesOfHedgesAxis |
| 2696 |
Hedges [member] |
Member |
|
|
ifrs-full:TypesOfHedgesMember |
| 2697 |
Fair Value Hedges [member] |
Member |
|
|
ifrs-full:FairValueHedgesMember |
| 2698 |
Cash Flow Hedges [member] |
Member |
|
|
ifrs-full:CashFlowHedgesMember |
| 2699 |
Types of risks [axis] |
Axis |
|
|
ifrs-full:TypesOfRisksAxis |
| 2700 |
Risks [member] |
Member |
|
|
ifrs-full:TypesOfRisksMember |
| 2701 |
Interest Rate Risks [member] |
Member |
|
|
ifrs-full:InterestRateRiskMember |
| 2702 |
Interest Rate And Foreign Currency Risk [member] |
Member |
|
|
ck0001087711:InterestRateAndForeignCurrencyRiskMember |
| 2703 |
Currency Risk [member] |
Member |
|
|
ifrs-full:CurrencyRiskMember |
| 2704 |
Equity Risks [member] |
Member |
|
|
ifrs-full:EquityPriceRiskMember |
| 2705 |
Disclosure of detailed information about hedges [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfHedgeAccountingLineItems |
| 2706 |
Income statement line item affected by the reclassification |
Concept (Text/String) |
For Period |
|
ifrs-full:DescriptionOfLineItemInStatementOfComprehensiveIncomeThatIncludesReclassificationAdjustments |
| 2707 |
Changes in FV of hedging instruments to calculate hedge ineffectiveness |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:GainLossOnChangeInFairValueOfHedgingInstrumentUsedAsBasisForRecognisingHedgeIneffectiveness |
| 2708 |
Changes in value of hedging instrument recognised in OCI |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:GainLossOnHedgeIneffectivenessRecognisedInOtherComprehensiveIncome |
| 2709 |
Changes in FV of hedged items to calculate hedge ineffectiveness |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:GainLossOnChangeInFairValueOfHedgedItemUsedAsBasisForRecognisingHedgeIneffectiveness |
| 2710 |
Hedge ineffectiveness recognised in income statement |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:GainLossOnHedgeIneffectivenessRecognisedInProfitOrLoss |
| 2711 |
Amount reclassified from cash flow hedging reserve to income statement |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:ReclassificationAdjustmentsOnCashFlowHedgesForWhichHedgedItemAffectedProfitOrLossNetOfTax |
| 2712 |
1212 - Disclosure - Derivative Financial Instruments - Additional Information (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureDerivativeFinancialInstrumentsAdditionalInformation |
| 2713 |
Implied Table |
Table |
* |
* |
implied:Table |
| 2714 |
Disclosure Of Derivative Financial Instruments [abstract] |
Abstract |
|
|
ck0001087711:DisclosureOfDerivativeFinancialInstrumentsAbstract |
| 2715 |
Ceased cash flow hedge accounting |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:AccumulatedFairValueHedgeAdjustmentRemainingInStatementOfFinancialPositionForHedgedItemThatCeasedToBeAdjustedForHedgingGainsAndLossesLiabilities |
| 2716 |
1213 - Disclosure - Derivative Financial Instruments - Summary of Reconciliation by Risk Category of Components of Equity and Analysis of Other Comprehensive Income Items Resulting from Hedge Accounting (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureDerivativeFinancialInstrumentsSummaryOfReconciliationByRiskCategoryOfComponentsOfEquityAndAnalysisOfOtherComprehensiveIncomeItemsResultingFromHedgeAccounting |
| 2717 |
Disclosure of detailed information about hedges [table] |
Table |
* |
* |
ifrs-full:DisclosureOfHedgeAccountingTable |
| 2718 |
Types of risks [axis] |
Axis |
|
|
ifrs-full:TypesOfRisksAxis |
| 2719 |
Risks [member] |
Member |
|
|
ifrs-full:TypesOfRisksMember |
| 2720 |
Interest Rate Risks [member] |
Member |
|
|
ifrs-full:InterestRateRiskMember |
| 2721 |
Foreign Currency Risk [member] |
Member |
|
|
ck0001087711:ForeignCurrencyRiskMember |
| 2722 |
Equity Risks [member] |
Member |
|
|
ifrs-full:EquityPriceRiskMember |
| 2723 |
Interest Rate And Foreign Currency Risk [member] |
Member |
|
|
ck0001087711:InterestRateAndForeignCurrencyRiskMember |
| 2724 |
Disclosure of detailed information about hedges [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfHedgeAccountingLineItems |
| 2725 |
Beginning Balance |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:ReserveOfCashFlowHedges |
| 2726 |
Effective portion of changes in fair value |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:GainsLossesOnCashFlowHedgesEffectivePortionOfChangesInFairValue |
| 2727 |
Income statement transfers |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:GainsLossesOnCashFlowHedgesIncomeStatementTransfers |
| 2728 |
Ending Balance |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:ReserveOfCashFlowHedges |
| 2729 |
1214 - Disclosure - Derivative Financial Instruments - Summary of Details of Hedged Exposures by Hedging Strategies (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureDerivativeFinancialInstrumentsSummaryOfDetailsOfHedgedExposuresByHedgingStrategies |
| 2730 |
Disclosure of detailed information about hedges [table] |
Table |
* |
* |
ifrs-full:DisclosureOfHedgeAccountingTable |
| 2731 |
Legal entity [axis] |
Axis |
|
|
dei:LegalEntityAxis |
| 2732 |
Entity [Domain] |
Member |
|
|
dei:EntityDomain |
| 2733 |
Santander UK Group [member] |
Member |
|
|
ck0001087711:SantanderUKGroupMember |
| 2734 |
Classes of assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfAssetsAxis |
| 2735 |
Assets [member] |
Member |
|
|
ifrs-full:ClassesOfAssetsMember |
| 2736 |
Loans and Advances to Customers [member] |
Member |
|
|
ck0001087711:LoansAndAdvancesToCustomersMember |
| 2737 |
Other financial assets at amortised cost [member] |
Member |
|
|
ck0001087711:OtherFinancialAssetsMeasuredAtAmortizedCostMember |
| 2738 |
Reverse repo agreement non trading [member] |
Member |
|
|
ck0001087711:ReverseRepoAgreementMember |
| 2739 |
Other financial assets at fair value through other comprehensive income [member] |
Member |
|
|
ck0001087711:OtherFinancialAssetsAtFairValueThroughOtherComprehensiveIncomeMember |
| 2740 |
Deposits by customers [member] |
Member |
|
|
ck0001087711:DepositsByCustomersMember |
| 2741 |
Deposits by banks [member] |
Member |
|
|
ck0001087711:DepositsByBanksMember |
| 2742 |
Debt Securities [member] |
Member |
|
|
ck0001087711:DebtSecuritiesInIssueMember |
| 2743 |
Subordinated liabilities [member] |
Member |
|
|
ck0001087711:SubordinatedLiabilitiesMember |
| 2744 |
Loans and advances to banks [member] |
Member |
|
|
ck0001087711:LoansAndAdvancesToBanksMember |
| 2745 |
Other financial assets measured at fair value through other comprehensive income [member] |
Member |
|
|
ck0001087711:OtherFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeMember |
| 2746 |
Highly probable forecast transactions [member] |
Member |
|
|
ck0001087711:HighlyProbableForecastTransactionsMember |
| 2747 |
Other Liabilities [member] |
Member |
|
|
ck0001087711:OtherLiabilitiesMember |
| 2748 |
Debt securities in issue and loans and advances to customers [member] |
Member |
|
|
ck0001087711:DebtSecuritiesInIssueAndLoansAndAdvancesToCustomersMember |
| 2749 |
Subordinated Liabilities and loans and advances to customers [member] |
Member |
|
|
ck0001087711:SubordinatedLiabilitiesAndLoansAndAdvancesToCustomersMember |
| 2750 |
Types of hedges [axis] |
Axis |
|
|
ifrs-full:TypesOfHedgesAxis |
| 2751 |
Hedges [member] |
Member |
|
|
ifrs-full:TypesOfHedgesMember |
| 2752 |
Fair Value Hedges [member] |
Member |
|
|
ifrs-full:FairValueHedgesMember |
| 2753 |
Cash Flow Hedges [member] |
Member |
|
|
ifrs-full:CashFlowHedgesMember |
| 2754 |
Types of risks [axis] |
Axis |
|
|
ifrs-full:TypesOfRisksAxis |
| 2755 |
Risks [member] |
Member |
|
|
ifrs-full:TypesOfRisksMember |
| 2756 |
Interest Rate Risks [member] |
Member |
|
|
ifrs-full:InterestRateRiskMember |
| 2757 |
Interest Rate And Foreign Currency Risk [member] |
Member |
|
|
ck0001087711:InterestRateAndForeignCurrencyRiskMember |
| 2758 |
Currency Risk [member] |
Member |
|
|
ifrs-full:CurrencyRiskMember |
| 2759 |
Equity Risks [member] |
Member |
|
|
ifrs-full:EquityPriceRiskMember |
| 2760 |
Disclosure of detailed information about hedges [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfHedgeAccountingLineItems |
| 2761 |
Carrying value of assets |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:HedgedItemAssets |
| 2762 |
Carrying value of liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:HedgedItemLiabilities |
| 2763 |
Accumulated amount of FV hedge adjustments on hedged item in carrying value of hedged item assets |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:AccumulatedFairValueHedgeAdjustmentOnHedgedItemIncludedInCarryingAmountAssets |
| 2764 |
Accumulated amount of FV hedge adjustments on hedged item in carrying value of hedged item liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:AccumulatedFairValueHedgeAdjustmentOnHedgedItemIncludedInCarryingAmountLiabilities |
| 2765 |
Accumulated amount of FV hedge adjustments for portfolio hedge of interest rate risks assets |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:AccumulatedFairValueOfHedgedAdjustmentsForPortfolioHedgeOfInterestRateRisksAssets |
| 2766 |
Accumulated amount of FV hedge adjustments for portfolio hedge of interest rate risks liabilities |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:AccumulatedFairValueOfHedgedAdjustmentsForPortfolioHedgeOfInterestRateRisksLiabilities |
| 2767 |
Change in value used for calculating hedge ineffectiveness |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:GainLossOnChangeInFairValueOfHedgedItemUsedAsBasisForRecognisingHedgeIneffectiveness |
| 2768 |
Accumulated amount of FV hedge adjustments on balance sheet for discontinued hedges |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:AccumulatedFairValueHedgeAdjustmentsOnBalanceSheetForDiscontinuedHedges |
| 2769 |
Cash flow hedge reserve |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:ReserveOfCashFlowHedges |
| 2770 |
Balances on cash flow hedge reserve where hedge accounting is no longer applied |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:ReserveOfCashFlowHedgesHedgingRelationshipsForWhichHedgeAccountingIsNoLongerApplied |
| 2771 |
1215 - Disclosure - Other Financial Assets at Fair Value Through Profit or Loss - Summary of Other Financial Assets at Fair Value Through Profit or Loss (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureOtherFinancialAssetsAtFairValueThroughProfitOrLossSummaryOfOtherFinancialAssetsAtFairValueThroughProfitOrLoss |
| 2772 |
Disclosure of financial assets designated as measured at fair value through profit or loss [table] |
Table |
* |
* |
ck0001087711:DisclosureOfFinancialAssetsDesignatedAsMeasuredAtFairValueThroughProfitOrLossTable |
| 2773 |
Classes of assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfAssetsAxis |
| 2774 |
Assets [member] |
Member |
|
|
ifrs-full:ClassesOfAssetsMember |
| 2775 |
Loans and Advances to Customers [member] |
Member |
|
|
ck0001087711:LoansAndAdvancesToCustomersMember |
| 2776 |
Debt Securities [member] |
Member |
|
|
ifrs-full:DebtSecuritiesMember |
| 2777 |
Reverse repurchase agreements - non-trading [member] |
Member |
|
|
ck0001087711:ReverseRepurchaseAgreementsNontradingMember |
| 2778 |
Classes of financial instruments [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialInstrumentsAxis |
| 2779 |
Financial instruments, class [member] |
Member |
|
|
ifrs-full:ClassesOfFinancialInstrumentsMember |
| 2780 |
Loans to Housing Associations [member] |
Member |
|
|
ck0001087711:LoansToHousingAssociationsMember |
| 2781 |
Other Loans [member] |
Member |
|
|
ck0001087711:OtherLoansMember |
| 2782 |
Disclosure of other financial assets at fair value through profit or loss [Line Items] |
LineItems |
|
|
ck0001087711:DisclosureOfOtherFinancialAssetsAtFairValueThroughProfitOrLossLineItems |
| 2783 |
Loans |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLoss |
| 2784 |
1216 - Disclosure - Other Financial Assets at Fair Value Through Profit or Loss - Summary of Other Financial Assets at Fair Value Through Profit or Loss (Parenthetical) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureOtherFinancialAssetsAtFairValueThroughProfitOrLossSummaryOfOtherFinancialAssetsAtFairValueThroughProfitOrLossParenthetical |
| 2785 |
Disclosure of financial assets designated as measured at fair value through profit or loss [table] |
Table |
* |
* |
ck0001087711:DisclosureOfFinancialAssetsDesignatedAsMeasuredAtFairValueThroughProfitOrLossTable |
| 2786 |
Categories of related parties [axis] |
Axis |
|
|
ifrs-full:CategoriesOfRelatedPartiesAxis |
| 2787 |
Entity's total for related parties [member] |
Member |
|
|
ifrs-full:EntitysTotalForRelatedPartiesMember |
| 2788 |
Santandar UK plc [member] |
Member |
|
|
ck0001087711:CompanyMember |
| 2789 |
Disclosure of other financial assets at fair value through profit or loss [Line Items] |
LineItems |
|
|
ck0001087711:DisclosureOfOtherFinancialAssetsAtFairValueThroughProfitOrLossLineItems |
| 2790 |
Financial assets designated at FVTPL |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossDesignatedAsUponInitialRecognition |
| 2791 |
Financial assets mandatorily at FVTPL |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossMandatorilyMeasuredAtFairValue |
| 2792 |
1217 - Disclosure - Other Financial Assets at Fair Value Through Profit or Loss - Additional Information (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureOtherFinancialAssetsAtFairValueThroughProfitOrLossAdditionalInformation |
| 2793 |
Disclosure of financial assets designated as measured at fair value through profit or loss [table] |
Table |
* |
* |
ck0001087711:DisclosureOfFinancialAssetsDesignatedAsMeasuredAtFairValueThroughProfitOrLossTable |
| 2794 |
Classes of assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfAssetsAxis |
| 2795 |
Assets [member] |
Member |
|
|
ifrs-full:ClassesOfAssetsMember |
| 2796 |
Debt Securities [member] |
Member |
|
|
ifrs-full:DebtSecuritiesMember |
| 2797 |
Disclosure of other financial assets at fair value through profit or loss [Line Items] |
LineItems |
|
|
ck0001087711:DisclosureOfOtherFinancialAssetsAtFairValueThroughProfitOrLossLineItems |
| 2798 |
Financial assets mandatorily at FVTPL |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossMandatorilyMeasuredAtFairValue |
| 2799 |
Net (loss)/gain attributable to changes in credit risk for loans and advances at fair value through profit or loss |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:ChangesInFairValueOfLoansOrReceivablesAttributableToChangesInCreditRiskOfFinancialAssets |
| 2800 |
Cumulative net loss attributable to changes in credit risk for loans and advances at fair value through profit or loss |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:AccumulatedChangesInFairValueOfLoanOrReceivableAttributableToChangesInCreditRiskOfFinancialAssets |
| 2801 |
1218 - Disclosure - Loans and Advances to Customers - Summary of Net Loans and Advances to Customers (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureLoansAndAdvancesToCustomersSummaryOfNetLoansAndAdvancesToCustomers |
| 2802 |
Implied Table |
Table |
* |
* |
implied:Table |
| 2803 |
Net Loans and Advances to Customers [abstract] |
Abstract |
|
|
ck0001087711:NetLoansAndAdvancesToCustomersAbstract |
| 2804 |
Loans secured on residential properties |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:LoansSecuredOnResidentialProperties |
| 2805 |
Corporate loans |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:CorporateLoans |
| 2806 |
Finance leases |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinanceLeaseReceivables |
| 2807 |
Other unsecured loans |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:OtherUnsecuredLoans |
| 2808 |
Amounts due from fellow Banco Santander subsidiaries and joint ventures |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:TradeAndOtherReceivablesDueFromRelatedParties |
| 2809 |
Amounts due from Santander UK Group Holdings plc |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:TradeAndOtherReceivables |
| 2810 |
Loans and advances to customers |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:LoansAndAdvancesToCustomersGross |
| 2811 |
Credit impairment loss allowances on loans and advances to customers |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:AllowanceAccountForCreditLossesOfFinancialAssets |
| 2812 |
RV and voluntary termination provisions on finance leases |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:ResidualValueAndVoluntaryTerminationProvisions |
| 2813 |
Net loans and advances to customers |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:LoansAndAdvancesToCustomers |
| 2814 |
1219 - Disclosure - Loans and Advances to Customers - Summary of Movement in Impairment Loss Allowances (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureLoansAndAdvancesToCustomersSummaryOfMovementInImpairmentLossAllowances |
| 2815 |
Movement in impairment loss allowances for loan and advances to customers [table] |
Table |
* |
* |
ck0001087711:MovementInImpairmentLossAllowancesForLoanAndAdvancesToCustomersTable |
| 2816 |
Classes of financial instruments [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialInstrumentsAxis |
| 2817 |
Financial instruments, class [member] |
Member |
|
|
ifrs-full:ClassesOfFinancialInstrumentsMember |
| 2818 |
Advances secured on residential property [member] |
Member |
|
|
ck0001087711:AdvancesSecuredOnResidentialPropertyMember |
| 2819 |
Corporate loans [member] |
Member |
|
|
ifrs-full:CorporateLoansMember |
| 2820 |
Finance leases [member] |
Member |
|
|
ifrs-full:LeaseReceivablesMember |
| 2821 |
Other unsecured advances [member] |
Member |
|
|
ck0001087711:OtherUnsecuredLoansMember |
| 2822 |
Movement in impairment loss allowances for loan and advances to customers [line items] |
LineItems |
|
|
ck0001087711:MovementInImpairmentLossAllowancesForLoanAndAdvancesToCustomersLineItems |
| 2823 |
Beginning balance |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:AllowanceAccountForCreditLossesOfFinancialAssets |
| 2824 |
Adoption of IFRS 9 (see Note 1) |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:AdjustmentForAdoptionOfIFRS9AllowanceAccountForCreditLossesOfFinancialAssets |
| 2825 |
Re-allocation of ECL on off-balance sheet exposures |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:ReallocationOfExpectedCreditLossOnUndrawnExposures |
| 2826 |
Balance at 1 January 2018 |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:AllowanceAccountForCreditLossesOfFinancialAssetOnAdoptionOfIFRS9 |
| 2827 |
(Release)/charge to the income statement (see Note 8) |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:ImpairmentLossesOnLoansAndAdvancesToCustomer |
| 2828 |
Write-offs and other items |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:UtilisationAllowanceAccountForCreditLossesOfFinancialAssets |
| 2829 |
Ending balance |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:AllowanceAccountForCreditLossesOfFinancialAssets |
| 2830 |
Observed |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:ImpairmentAllowancesAgainstLoansAndAdvancesCustomersObserved |
| 2831 |
Incurred but not yet observed |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:ImpairmentAllowancesIncurredButNotYetObserved |
| 2832 |
Recoveries, net of collection costs (see Note 8) |
Concept (Monetary) |
For Period |
|
ifrs-full:ReversalAllowanceAccountForCreditLossesOfFinancialAssets |
| 2833 |
1220 - Disclosure - Loans and Advances to Customers - Summary of Movement in Impairment Loss Allowances (Parenthetical) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureLoansAndAdvancesToCustomersSummaryOfMovementInImpairmentLossAllowancesParenthetical |
| 2834 |
Implied Table |
Table |
* |
* |
implied:Table |
| 2835 |
Disclosure of impairment loss recognised or reversed for cash-generating unit [abstract] |
Abstract |
|
|
ifrs-full:DisclosureOfImpairmentLossRecognisedOrReversedAbstract |
| 2836 |
Mortgage write-offs of financial assets |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:MortgageWriteoffsIncludingEffectOfDiscounting |
| 2837 |
Contractual amount outstanding on financial assets, written off |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssetsWrittenOffDuringReportingPeriodAndStillSubjectToEnforcementActivityContractualAmountOutstanding |
| 2838 |
1221 - Disclosure - Loans and Advances to Customers - Summary of Finance Lease and Hire Purchase Contract Receivables (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureLoansAndAdvancesToCustomersSummaryOfFinanceLeaseAndHirePurchaseContractReceivables |
| 2839 |
Disclosure of finance costs and unwinding of obligations [table] |
Table |
* |
* |
ck0001087711:DisclosureOfFinanceCostsAndUnwindingOfObligationsTable |
| 2840 |
Maturity [axis] |
Axis |
|
|
ifrs-full:MaturityAxis |
| 2841 |
Aggregated time bands [member] |
Member |
|
|
ifrs-full:AggregatedTimeBandsMember |
| 2842 |
Not Later Than 1 Year [member] |
Member |
|
|
ifrs-full:NotLaterThanOneYearMember |
| 2843 |
Later Than One Year and Not Later Than Five Years [member] |
Member |
|
|
ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember |
| 2844 |
Later Than Five Years [member] |
Member |
|
|
ifrs-full:LaterThanFiveYearsMember |
| 2845 |
Disclosure of finance lease and hire purchase contract receivables [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfFinanceLeaseAndHirePurchaseContractReceivablesLineItems |
| 2846 |
Gross investment |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:GrossInvestmentInFinanceLease |
| 2847 |
Unearned finance income |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:UnearnedFinanceIncomeOnFinanceLease |
| 2848 |
Net investment |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:NetInvestmentInFinanceLease |
| 2849 |
1222 - Disclosure - Loans and Advances To Customers - Additional Information (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureLoansAndAdvancesToCustomersAdditionalInformation |
| 2850 |
Implied Table |
Table |
* |
* |
implied:Table |
| 2851 |
Disclosure of finance lease and hire purchase contract receivables [abstract] |
Abstract |
|
|
ck0001087711:DisclosureOfFinanceLeaseAndHirePurchaseContractReceivablesAbstract |
| 2852 |
Unguaranteed residual value of leases |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:DiscountedUnguaranteedResidualValueOfAssetsSubjectToFinanceLease |
| 2853 |
Contingent rent income |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:ContingentRentIncome |
| 2854 |
1223 - Disclosure - Securitisations and Covered Bonds - Analysis of Securitisations and Covered Bonds (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureSecuritisationsAndCoveredBondsAnalysisOfSecuritisationsAndCoveredBonds |
| 2855 |
Disclosure of securitisations and covered bonds [table] |
Table |
* |
* |
ck0001087711:DisclosureOfSecuritisationsAndCoveredBondsTable |
| 2856 |
Securitisation By Company Name [axis] |
Axis |
|
|
ck0001087711:SecuritisationByCompanyNameAxis |
| 2857 |
Securitisation By Company Name [domain] |
Member |
|
|
ck0001087711:SecuritisationByCompanyNameDomain |
| 2858 |
Holmes [member] |
Member |
|
|
ck0001087711:HolmesMember |
| 2859 |
Fosse [member] |
Member |
|
|
ck0001087711:FosseMember |
| 2860 |
Langton [member] |
Member |
|
|
ck0001087711:LangtonMember |
| 2861 |
Auto ABS UK Loans [member] |
Member |
|
|
ck0001087711:AutoABSUKLoansMember |
| 2862 |
Euro 35bn Global Covered Bond Programme [member] |
Member |
|
|
ck0001087711:EuroThirtyFiveBillionGlobalCoveredBondProgrammeMember |
| 2863 |
Motor [member] |
Member |
|
|
ck0001087711:MotorMember |
| 2864 |
Securitization By Program Name [axis] |
Axis |
|
|
ck0001087711:SecuritizationByProgramNameAxis |
| 2865 |
Securitization By Program Name [domain] |
Member |
|
|
ck0001087711:SecuritizationByProgramNameDomain |
| 2866 |
Covered Bond Programme [member] |
Member |
|
|
ck0001087711:CoveredBondProgrammeMember |
| 2867 |
Securitisation Programmes [member] |
Member |
|
|
ck0001087711:SecuritisationProgrammesMember |
| 2868 |
Type Of Securitisation [axis] |
Axis |
|
|
ck0001087711:TypeOfSecuritisationAxis |
| 2869 |
Type Of Securitisation [domain] |
Member |
|
|
ck0001087711:TypeOfSecuritisationDomain |
| 2870 |
Master Trust Structures [member] |
Member |
|
|
ck0001087711:MasterTrustStructuresMember |
| 2871 |
Other Securitisation Structures [member] |
Member |
|
|
ck0001087711:OtherSecuritisationStructuresMember |
| 2872 |
Disclosure of securitisations and covered bonds [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfSecuritisationsAndCoveredBondsLineItems |
| 2873 |
Gross assets |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:AssetsRecognisedInEntitysFinancialStatementsInRelationToStructuredEntities |
| 2874 |
External notes in issue |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:NotesAndDebenturesIssued |
| 2875 |
Notes issued to Santander UK plc/subsidiaries as collateral |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssetsPledgedAsCollateralForLiabilitiesOrContingentLiabilities |
| 2876 |
held by the Santander UK group |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:NotesInIssueHeldByGroup |
| 2877 |
Total securitisation and covered bond programmes (see Note 28) |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:SecuritisationsAndCoveredBond |
| 2878 |
1224 - Disclosure - Securitisations and Covered Bonds - Summary of Issuances and Redemptions of Securitisation and Covered Bond Programme (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureSecuritisationsAndCoveredBondsSummaryOfIssuancesAndRedemptionsOfSecuritisationAndCoveredBondProgramme |
| 2879 |
Issuances And Redemptions Of Securitisation And Covered Bond [table] |
Table |
* |
* |
ck0001087711:IssuancesAndRedemptionsOfSecuritisationAndCoveredBondTable |
| 2880 |
Securitization By Program Name [axis] |
Axis |
|
|
ck0001087711:SecuritizationByProgramNameAxis |
| 2881 |
Securitization By Program Name [domain] |
Member |
|
|
ck0001087711:SecuritizationByProgramNameDomain |
| 2882 |
Internal [member] |
Member |
|
|
ck0001087711:InternalMember |
| 2883 |
External [member] |
Member |
|
|
ck0001087711:ExternalMember |
| 2884 |
Type Of Securitisation [axis] |
Axis |
|
|
ck0001087711:TypeOfSecuritisationAxis |
| 2885 |
Type Of Securitisation [domain] |
Member |
|
|
ck0001087711:TypeOfSecuritisationDomain |
| 2886 |
Master Trust Structures [member] |
Member |
|
|
ck0001087711:MasterTrustStructuresMember |
| 2887 |
Other Securitisation Structures [member] |
Member |
|
|
ck0001087711:OtherSecuritisationStructuresMember |
| 2888 |
Covered Bond Programme [member] |
Member |
|
|
ck0001087711:CoveredBondProgrammeMember |
| 2889 |
Securitisation By Company Name [axis] |
Axis |
|
|
ck0001087711:SecuritisationByCompanyNameAxis |
| 2890 |
Securitisation By Company Name [domain] |
Member |
|
|
ck0001087711:SecuritisationByCompanyNameDomain |
| 2891 |
Holmes [member] |
Member |
|
|
ck0001087711:HolmesMember |
| 2892 |
Fosse [member] |
Member |
|
|
ck0001087711:FosseMember |
| 2893 |
Motor [member] |
Member |
|
|
ck0001087711:MotorMember |
| 2894 |
Auto ABS UK Loans [member] |
Member |
|
|
ck0001087711:AutoABSUKLoansMember |
| 2895 |
Issuances And Redemptions Of Securitisation And Covered Bond [Line items] |
LineItems |
|
|
ck0001087711:IssuancesAndRedemptionsOfSecuritisationAndCoveredBondLineItems |
| 2896 |
Internal and external issuances |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:MortgageBackedNotesIssued |
| 2897 |
Internal and external redemptions |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:MortgageBackedSecuritiesRedeemed |
| 2898 |
1225 - Disclosure - Securitisations and Covered Bonds - Additional Information (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureSecuritisationsAndCoveredBondsAdditionalInformation |
| 2899 |
Gross assets securitised [table] |
Table |
* |
* |
ck0001087711:GrossAssetsSecuritisedTable |
| 2900 |
Securitisation By Company Name [axis] |
Axis |
|
|
ck0001087711:SecuritisationByCompanyNameAxis |
| 2901 |
Securitisation By Company Name [domain] |
Member |
|
|
ck0001087711:SecuritisationByCompanyNameDomain |
| 2902 |
Holmes [member] |
Member |
|
|
ck0001087711:HolmesMember |
| 2903 |
Fosse [member] |
Member |
|
|
ck0001087711:FosseMember |
| 2904 |
Langton [member] |
Member |
|
|
ck0001087711:LangtonMember |
| 2905 |
Disclosure of gross asset securitised [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfGrossAssetSecuritisedLineItems |
| 2906 |
Beneficial interest in residential mortgage loans |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:BeneficialInterestInMortgages |
| 2907 |
Cash deposits |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:CashDeposit |
| 2908 |
1226 - Disclosure - Transfers of Financial Assets Not Qualifying for Derecognition - Carrying Amount of Financial Assets that Did Not Qualify for Derecognition and their Associated Financial Liabilities (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureTransfersOfFinancialAssetsNotQualifyingForDerecognitionCarryingAmountOfFinancialAssetsThatDidNotQualifyForDerecognitionAndTheirAssociatedFinancialLiabilities |
| 2909 |
Disclosure of continuing involvement in derecognised financial assets [table] |
Table |
* |
* |
ifrs-full:DisclosureOfContinuingInvolvementInDerecognisedFinancialAssetsTable |
| 2910 |
Continuing involvement in derecognised financial assets by type of transfer [axis] |
Axis |
|
|
ifrs-full:ContinuingInvolvementInDerecognisedFinancialAssetsByTypeOfTransferAxis |
| 2911 |
Types of transfer [member] |
Member |
|
|
ifrs-full:TypesOfTransferMember |
| 2912 |
Sale and Repurchase Agreements [member] |
Member |
|
|
ck0001087711:SaleAndRepurchaseAgreementsMember |
| 2913 |
Securities lending agreements [member] |
Member |
|
|
ck0001087711:SecuritiesLendingAgreementsMember |
| 2914 |
Securitisations [member] |
Member |
|
|
ifrs-full:SecuritisationsMember |
| 2915 |
Disclosure of continuing involvement in derecognised financial assets [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfContinuingInvolvementInDerecognisedFinancialAssetsLineItems |
| 2916 |
Carrying amount of financial assets not derecognised in their entirety |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:RecognisedAssetsRepresentingContinuingInvolvementInDerecognisedFinancialAssets |
| 2917 |
Carrying amount of associated financial liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:RecognisedLiabilitiesRepresentingContinuingInvolvementInDerecognisedFinancialAssets |
| 2918 |
1227 - Disclosure - Reverse Repurchase Agreements - Non Trading - Summary of Reverse Repurchase Agreements - Non Trading (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureReverseRepurchaseAgreementsNonTradingSummaryOfReverseRepurchaseAgreementsNonTrading |
| 2919 |
Disclosure of reserve repurchase agreements non-trading [table] |
Table |
* |
* |
ck0001087711:DisclosureOfReserveRepurchaseAgreementsNontradingTable |
| 2920 |
Types of agreement [axis] |
Axis |
|
|
ck0001087711:TypesOfAgreementAxis |
| 2921 |
Types of agreement [domain] |
Member |
|
|
ck0001087711:TypesOfAgreementDomain |
| 2922 |
Agreements with banks [member] |
Member |
|
|
ck0001087711:AgreementsWithBanksMember |
| 2923 |
Agreements with customers [member] |
Member |
|
|
ck0001087711:AgreementsWithCustomersMember |
| 2924 |
Disclosure of reserve repurchase agreements non-trading [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfReserveRepurchaseAgreementsNontradingLineItems |
| 2925 |
Reverse repurchase agreements-non trading |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:ReverseRepurchaseAgreementsAndCashCollateralOnSecuritiesBorrowed |
| 2926 |
1228 - Disclosure - Other Financial Assets At Amortised Cost - Summary of Other Financial Assets at Amortised Cost (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureOtherFinancialAssetsAtAmortisedCostSummaryOfOtherFinancialAssetsAtAmortisedCost |
| 2927 |
Financial Assets At Fair Value Through Profit Or Loss [table] |
Table |
* |
* |
ck0001087711:FinancialAssetsAtFairValueThroughProfitOrLossTable |
| 2928 |
Categories of financial assets [axis] |
Axis |
|
|
ifrs-full:CategoriesOfFinancialAssetsAxis |
| 2929 |
Financial assets, category [member] |
Member |
|
|
ifrs-full:FinancialAssetsCategoryMember |
| 2930 |
Other Financial Assets [member] |
Member |
|
|
ck0001087711:OtherFinancialAssets1Member |
| 2931 |
Classes of assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfAssetsAxis |
| 2932 |
Assets [member] |
Member |
|
|
ifrs-full:ClassesOfAssetsMember |
| 2933 |
Asset backed securities [member] |
Member |
|
|
ck0001087711:AssetBackedSecuritiesMember |
| 2934 |
Debt Securities [member] |
Member |
|
|
ifrs-full:DebtSecuritiesMember |
| 2935 |
Financial assets at amortised cost [line items] |
LineItems |
|
|
ck0001087711:OtherFinancialAssetsAtAmortisedCostLineItems |
| 2936 |
Financial assets at amortised cost |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:OtherFinancialAssetsAtAmortisedCost |
| 2937 |
1229 - Disclosure - Financial Assets At Fair Value Through Other Comprehensive Income - Summary of Financial Assets at Fair Value Through Other Comprehensive Income (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureFinancialAssetsAtFairValueThroughOtherComprehensiveIncomeSummaryOfFinancialAssetsAtFairValueThroughOtherComprehensiveIncome |
| 2938 |
Implied Table |
Table |
* |
* |
implied:Table |
| 2939 |
Financial assets at fair value through other comprehensive income [abstract] |
Abstract |
|
|
ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeAbstract |
| 2940 |
Debt securities |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:DebtSecuritiesClassifiedAsFairValueThroughOtherComprehensiveIncome |
| 2941 |
Loans and advances to customers |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:LoansAndAdvanceToCustomersClassifiedAsFairValueThroughOtherComprehensiveIncome |
| 2942 |
Financial assets at fair value through other comprehensive income |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncome |
| 2943 |
1230 - Disclosure - Financial Investments - Summary of Financial Investments (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureFinancialInvestmentsSummaryOfFinancialInvestments |
| 2944 |
Disclosure of financial investments [table] |
Table |
* |
* |
ck0001087711:DisclosureOfFinancialInvestmentsTable |
| 2945 |
Categories of financial assets [axis] |
Axis |
|
|
ifrs-full:CategoriesOfFinancialAssetsAxis |
| 2946 |
Financial assets, category [member] |
Member |
|
|
ifrs-full:FinancialAssetsCategoryMember |
| 2947 |
Available-for-sale [member] |
Member |
|
|
ifrs-full:FinancialAssetsAvailableforsaleCategoryMember |
| 2948 |
Held-to-maturity debt securities [member] |
Member |
|
|
ifrs-full:HeldtomaturityInvestmentsCategoryMember |
| 2949 |
Classes of financial assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialAssetsAxis |
| 2950 |
Financial assets, class [member] |
Member |
|
|
ifrs-full:FinancialAssetsMember |
| 2951 |
Asset-backed Securities [member] |
Member |
|
|
ck0001087711:AssetBackedSecuritiesAssetsMember |
| 2952 |
Debt Securities [member] |
Member |
|
|
ifrs-full:DebtSecuritiesMember |
| 2953 |
Equity Securities [member] |
Member |
|
|
ifrs-full:OtherEquitySecuritiesMember |
| 2954 |
Disclosure of financial investments [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfFinancialInvestmentsLineItems |
| 2955 |
Financial investments |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:FinancialInvestments |
| 2956 |
1231 - Disclosure - Interests in Other Entities - Schedule of Interests in Other Entities (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureInterestsInOtherEntitiesScheduleOfInterestsInOtherEntities |
| 2957 |
Implied Table |
Table |
* |
* |
implied:Table |
| 2958 |
Disclosure of interest in other entities [abstract] |
Abstract |
|
|
ck0001087711:DisclosureOfInterestInOtherEntitiesAbstract |
| 2959 |
Joint ventures |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:InvestmentsInJointVentures |
| 2960 |
Total |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:InvestmentsInSubsidiariesJointVenturesAndAssociates |
| 2961 |
1232 - Disclosure - Interests In Other Entities - Additional Information (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureInterestsInOtherEntitiesAdditionalInformation |
| 2962 |
Disclosure of subsidiaries [table] |
Table |
* |
* |
ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesTable |
| 2963 |
Categories of related parties [axis] |
Axis |
|
|
ifrs-full:CategoriesOfRelatedPartiesAxis |
| 2964 |
Entity's total for related parties [member] |
Member |
|
|
ifrs-full:EntitysTotalForRelatedPartiesMember |
| 2965 |
Santander UK Operations Ltd [member] |
Member |
|
|
ck0001087711:SantanderUkOperationsLtdMember |
| 2966 |
Santander UK Technology Ltd [member] |
Member |
|
|
ck0001087711:SantanderUkTechnologyLtdMember |
| 2967 |
Produban servicios informaticos generales SI [member] |
Member |
|
|
ck0001087711:ProdubanServiciosInformaticosGeneralesSlMember |
| 2968 |
Santander Equity Investments Limited [member] |
Member |
|
|
ck0001087711:SantanderEquityInvestmentsLimitedMember |
| 2969 |
Santander UK Group Holdings plc [member] |
Member |
|
|
ck0001087711:SantanderUkGroupHoldingsPlcMember |
| 2970 |
ANTS plc [member] |
Member |
|
|
ck0001087711:ANTSPlcMember |
| 2971 |
Jersey and Isle of Man branches [member] |
Member |
|
|
ck0001087711:JerseyAndIsleOfManBranchesMember |
| 2972 |
Subsidiaries [axis] |
Axis |
|
|
ifrs-full:SignificantInvestmentsInSubsidiariesAxis |
| 2973 |
Entity's total for subsidiaries [member] |
Member |
|
|
ifrs-full:EntitysTotalForSubsidiariesMember |
| 2974 |
Subsidiaries with material non-controlling interests [member] |
Member |
|
|
ifrs-full:SubsidiariesWithMaterialNoncontrollingInterestsMember |
| 2975 |
Non-adjusting events after reporting period [axis] |
Axis |
|
|
ifrs-full:NonadjustingEventsAfterReportingPeriodAxis |
| 2976 |
Non-adjusting Events After Reporting Period [member] |
Member |
|
|
ifrs-full:NonadjustingEventsMember |
| 2977 |
Events After Reporting Period [member] |
Member |
|
|
ck0001087711:EventsAfterReportingPeriodMember |
| 2978 |
Disclosure of subsidiaries [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesLineItems |
| 2979 |
Percentage of ownership in subsidiaries |
Concept (Percent) |
For Period |
|
ifrs-full:ProportionOfOwnershipInterestInSubsidiary |
| 2980 |
Cash consideration |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:ConsiderationPaidReceived |
| 2981 |
Aggregate net asset on acquisition date |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:IdentifiableAssetsAcquiredLiabilitiesAssumed |
| 2982 |
Percentage of sale of share capital in subsidiaries |
Concept (Percent) |
For Period |
|
ck0001087711:SaleOfShareCapitalIssuedPercentage |
| 2983 |
Dividends on transfer of share capital |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:DividendsPaidOrdinaryShares |
| 2984 |
Increase (decrease) in investment property |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:ChangesInInvestmentProperty |
| 2985 |
Disposals, investment property |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:DisposalsInvestmentProperty |
| 2986 |
1233 - Disclosure - Interests in Other Entities - Schedule of Subsidiaries With Significant Non-Controlling Interests (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureInterestsInOtherEntitiesScheduleOfSubsidiariesWithSignificantNonControllingInterests |
| 2987 |
Disclosure of subsidiaries [table] |
Table |
* |
* |
ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesTable |
| 2988 |
Subsidiaries [axis] |
Axis |
|
|
ifrs-full:SignificantInvestmentsInSubsidiariesAxis |
| 2989 |
Entity's total for subsidiaries [member] |
Member |
|
|
ifrs-full:EntitysTotalForSubsidiariesMember |
| 2990 |
Subsidiaries with material non-controlling interests [member] |
Member |
|
|
ifrs-full:SubsidiariesWithMaterialNoncontrollingInterestsMember |
| 2991 |
Disclosure of subsidiaries [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesLineItems |
| 2992 |
Profit attributable to non-controlling interests |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:ProfitLossAttributableToNoncontrollingInterests |
| 2993 |
Accumulated non-controlling interests of the subsidiary |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:NoncontrollingInterests |
| 2994 |
Dividends paid to non-controlling interests |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:DividendsPaidToNoncontrollingInterests |
| 2995 |
Total assets |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:Assets |
| 2996 |
Total liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:Liabilities |
| 2997 |
Profit for the year |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:ProfitLoss |
| 2998 |
Total comprehensive income for the year |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:ComprehensiveIncome |
| 2999 |
1234 - Disclosure - Interests In Other Entities - Interests in Joint Ventures - Additional Information (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureInterestsInOtherEntitiesInterestsInJointVenturesAdditionalInformation |
| 3000 |
Disclosure of information about unconsolidated subsidiaries [table] |
Table |
* |
* |
ifrs-full:DisclosureOfInformationAboutUnconsolidatedSubsidiariesTable |
| 3001 |
Joint ventures [axis] |
Axis |
|
|
ifrs-full:JointVenturesAxis |
| 3002 |
Entity's total for joint ventures [member] |
Member |
|
|
ifrs-full:EntitysTotalForJointVenturesMember |
| 3003 |
Joint ventures [member] |
Member |
|
|
ifrs-full:JointVenturesMember |
| 3004 |
Disclosure of joint ventures [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfJointVenturesLineItems |
| 3005 |
Profit after tax |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:ShareOfProfitLossOfContinuingOperationsOfAssociatesAndJointVenturesAccountedForUsingEquityMethod |
| 3006 |
Carrying value of interest in joint venture |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:InvestmentsInJointVentures |
| 3007 |
Commitments and contingent liabilities |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:CommitmentsAndContingencies1 |
| 3008 |
1235 - Disclosure - Interests In Other Entities - Interests in Unconsolidated Structured Entities - Additional Information (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureInterestsInOtherEntitiesInterestsInUnconsolidatedStructuredEntitiesAdditionalInformation |
| 3009 |
Disclosure of information about unconsolidated subsidiaries [table] |
Table |
* |
* |
ifrs-full:DisclosureOfInformationAboutUnconsolidatedSubsidiariesTable |
| 3010 |
Unconsolidated structured entities [axis] |
Axis |
|
|
ifrs-full:UnconsolidatedStructuredEntitiesAxis |
| 3011 |
Entity's total for unconsolidated structured entities [member] |
Member |
|
|
ifrs-full:EntitysTotalForUnconsolidatedStructuredEntitiesMember |
| 3012 |
Santander (UK) Common Investment Fund [member] |
Member |
|
|
ck0001087711:SantanderUkCommonInvestmentFundMember |
| 3013 |
Abbey National Capital Trust I [member] |
Member |
|
|
ck0001087711:AbbeyNationalCapitalTrustiMember |
| 3014 |
Abbey National Capital LP I [member] |
Member |
|
|
ck0001087711:AbbeyNationalCapitalLpMember |
| 3015 |
Categories of related parties [axis] |
Axis |
|
|
ifrs-full:CategoriesOfRelatedPartiesAxis |
| 3016 |
Entity's total for related parties [member] |
Member |
|
|
ifrs-full:EntitysTotalForRelatedPartiesMember |
| 3017 |
Entities with Joint Control or Significant Influence over Entity [Member] |
Member |
|
|
ifrs-full:JointControlOrSignificantInfluenceMember |
| 3018 |
Disclosure of information about unconsolidated subsidiaries [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfInformationAboutUnconsolidatedSubsidiariesLineItems |
| 3019 |
Defined benefit assets and obligations |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:AssetsOfBenefitPlan |
| 3020 |
Name of subsidiary |
Concept (Text/String) |
For Period |
|
ifrs-full:NameOfSubsidiary |
| 3021 |
Ownership interest in trust preferred entities by Santander UK plc |
Concept (Percent) |
For Period |
|
ifrs-full:ProportionOfOwnershipInterestInSubsidiary |
| 3022 |
Non-cumulative trust preferred securities issued |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:NoncumulativeTrustPreferredSecuritiesIssued |
| 3023 |
Non-cumulative trust preferred securities interest rate |
Concept (Percent) |
For Period |
|
ck0001087711:NoncumulativeTrustPreferredSecuritiesInterestRate |
| 3024 |
Number of credit protection vehicles |
Concept (Decimal) |
For Period |
|
ck0001087711:NumberOfCreditProtectionVehicles |
| 3025 |
Credit Linked Notes issued |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:CreditLinkedNotesIssued |
| 3026 |
1236 - Disclosure - Intangible Assets - Schedule of Goodwill (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureIntangibleAssetsScheduleOfGoodwill |
| 3027 |
Disclosure of Goodwill [table] |
Table |
* |
* |
ck0001087711:DisclosureOfGoodwillTable |
| 3028 |
Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] |
Axis |
|
|
ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis |
| 3029 |
Carrying amount [member] |
Member |
|
|
ifrs-full:CarryingAmountMember |
| 3030 |
Cost [member] |
Member |
|
|
ifrs-full:GrossCarryingAmountMember |
| 3031 |
Accumulated Impairment [member] |
Member |
|
|
ifrs-full:AccumulatedImpairmentMember |
| 3032 |
Disclosure of goodwill [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfGoodwillLineItems |
| 3033 |
Carrying amount |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:Goodwill |
| 3034 |
1237 - Disclosure - Intangible Assets - Additional Information (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureIntangibleAssetsAdditionalInformation |
| 3035 |
Implied Table |
Table |
* |
* |
implied:Table |
| 3036 |
Disclosure of detailed information about intangible assets [abstract] |
Abstract |
|
|
ifrs-full:DisclosureOfIntangibleAssetsAbstract |
| 3037 |
Goodwill impairment recognised |
Concept (Monetary) |
For Period |
|
ifrs-full:ImpairmentLossRecognisedInProfitOrLossGoodwill |
| 3038 |
Increase/(decrease) in discount rate percentage |
Concept (Percent) |
For Period |
|
ck0001087711:IncreaseDecreaseInDiscountRateAppliedToCashFlowProjections |
| 3039 |
Discount rate percentage |
Concept (Percent) |
As Of |
|
ifrs-full:DescriptionOfDiscountRatesAppliedToCashFlowProjections |
| 3040 |
1238 - Disclosure - Intangible Assets - Schedule of Goodwill for Cash Generating Units (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureIntangibleAssetsScheduleOfGoodwillForCashGeneratingUnits |
| 3041 |
Disclosure of information for cash-generating units [table] |
Table |
* |
* |
ifrs-full:DisclosureOfInformationForIndividualAssetOrCashgeneratingUnitWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesTable |
| 3042 |
Individual assets or cash-generating units [axis] |
Axis |
|
|
ifrs-full:IndividualAssetsOrCashgeneratingUnitsAxis |
| 3043 |
Entity's total for individual assets or cash-generating units [member] |
Member |
|
|
ifrs-full:EntitysTotalForIndividualAssetsOrCashgeneratingUnitsMember |
| 3044 |
Personal Financial Services [member] |
Member |
|
|
ck0001087711:PersonalFinancialServicesMember |
| 3045 |
Private Banking [member] |
Member |
|
|
ck0001087711:PrivateBankingMember |
| 3046 |
Other [member] |
Member |
|
|
ck0001087711:OtherMember |
| 3047 |
Disclosure of information for cash-generating units [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfInformationForIndividualAssetOrCashgeneratingUnitWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesLineItems |
| 3048 |
Goodwill |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:Goodwill |
| 3049 |
Discount rate |
Concept (Percent) |
As Of |
|
ifrs-full:DescriptionOfDiscountRatesAppliedToCashFlowProjections |
| 3050 |
Growth rate |
Concept (Percent) |
As Of |
|
ifrs-full:DescriptionOfGrowthRateUsedToExtrapolateCashFlowProjections |
| 3051 |
1239 - Disclosure - Intangible Assets - Schedule of Goodwill for Cash Generating Units (Parenthetical) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureIntangibleAssetsScheduleOfGoodwillForCashGeneratingUnitsParenthetical |
| 3052 |
Implied Table |
Table |
* |
* |
implied:Table |
| 3053 |
Disclosure of information for cash-generating units [abstract] |
Abstract |
|
|
ifrs-full:DisclosureOfInformationForIndividualAssetOrCashgeneratingUnitWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAbstract |
| 3054 |
Terminal growth rate |
Concept (Percent) |
For Period |
|
ck0001087711:TerminalGrowthRateUsedToExtrapolateCashFlowProjections |
| 3055 |
1240 - Disclosure - Intangible Assets - Schedule of Other Intangibles (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureIntangibleAssetsScheduleOfOtherIntangibles |
| 3056 |
Disclosure of detailed information about intangible assets [table] |
Table |
* |
* |
ifrs-full:DisclosureOfIntangibleAssetsTable |
| 3057 |
Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] |
Axis |
|
|
ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis |
| 3058 |
Carrying amount [member] |
Member |
|
|
ifrs-full:CarryingAmountMember |
| 3059 |
Cost [member] |
Member |
|
|
ifrs-full:GrossCarryingAmountMember |
| 3060 |
Accumulated Amortisation / Impairment [member] |
Member |
|
|
ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember |
| 3061 |
Disclosure of detailed information about intangible assets [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfIntangibleAssetsLineItems |
| 3062 |
Beginning balance |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:IntangibleAssetsOtherThanGoodwill |
| 3063 |
Additions |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:AdditionsOtherThanThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill |
| 3064 |
Write offs |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:RetirementsIntangibleAssetsOtherThanGoodwill |
| 3065 |
Disposals |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:DisposalsIntangibleAssetsOtherThanGoodwill |
| 3066 |
Charge |
Concept (Monetary) |
For Period |
|
ifrs-full:AmortisationIntangibleAssetsOtherThanGoodwill |
| 3067 |
Sales |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:SalesIntangibleAssetsOtherThanGoodwill |
| 3068 |
Impairment |
Concept (Monetary) |
For Period |
|
ifrs-full:ImpairmentLossRecognisedInProfitOrLossIntangibleAssetsOtherThanGoodwill |
| 3069 |
Ending balance |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:IntangibleAssetsOtherThanGoodwill |
| 3070 |
1241 - Disclosure - Trading Liabilities - Schedule of Trading Liabilities (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureTradingLiabilitiesScheduleOfTradingLiabilities |
| 3071 |
Disclosure of financial liabilities held for trading [table] |
Table |
* |
* |
ck0001087711:DisclosureOfFinancialLiabilitiesHeldForTradingTable |
| 3072 |
Classes of financial liabilities [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialLiabilitiesAxis |
| 3073 |
Total [Member] |
Member |
|
|
ifrs-full:FinancialLiabilitiesMember |
| 3074 |
Securities Sold Under Repurchase Agreements [member] |
Member |
|
|
ck0001087711:SecuritiesSoldUnderRepurchaseAgreementsMember |
| 3075 |
Short Positions in Securities and Unsettled Trades [member] |
Member |
|
|
ck0001087711:ShortPositionsInSecuritiesAndUnsettledTradesMember |
| 3076 |
Cash Collateral [member] |
Member |
|
|
ck0001087711:CashCollateralMember |
| 3077 |
Disclosure of financial liabilities held for trading [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfFinancialLiabilitiesHeldForTradingLineItems |
| 3078 |
Trading liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossClassifiedAsHeldForTrading |
| 3079 |
1242 - Disclosure - Other Financial Liabilities at Fair Value Through Profit or Loss - Summary of Other Financial Liabilities at Fair Value Through Profit or Loss (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureOtherFinancialLiabilitiesAtFairValueThroughProfitOrLossSummaryOfOtherFinancialLiabilitiesAtFairValueThroughProfitOrLoss |
| 3080 |
Disclosure Of Other Financial Liabilities At Fair Value Through Profit Or Loss [table] |
Table |
* |
* |
ck0001087711:DisclosureOfOtherFinancialLiabilitiesAtFairValueThroughProfitOrLossTable |
| 3081 |
Classes of financial liabilities [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialLiabilitiesAxis |
| 3082 |
Total [Member] |
Member |
|
|
ifrs-full:FinancialLiabilitiesMember |
| 3083 |
US Dollar Ten Billion Euro commercial paper programmes [member] |
Member |
|
|
ck0001087711:UsDollarTenBillionEuroCommercialPaperProgrammesMember |
| 3084 |
US$30bn Euro Medium Term Note Programme [member] |
Member |
|
|
ck0001087711:USDollarThirtyBillionEuroMediumTermNoteProgrammeMember |
| 3085 |
Structured Notes Programmes [member] |
Member |
|
|
ck0001087711:StructuredNotesProgrammesMember |
| 3086 |
Eurobonds [member] |
Member |
|
|
ck0001087711:EurobondsMember |
| 3087 |
Structured Deposits [member] |
Member |
|
|
ck0001087711:StructuredDepositsMember |
| 3088 |
Collateral and associated financial guarantees [member] |
Member |
|
|
ck0001087711:CollateralsAndGuaranteesMember |
| 3089 |
Repurchase agreements - non trading [member] |
Member |
|
|
ck0001087711:RepurchaseAgreementsNontradingMember |
| 3090 |
Disclosure of other financial liabilities at fair value through profit or loss [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfOtherFinancialLiabilitiesAtFairValueThroughProfitOrLossLineItems |
| 3091 |
Other financial liabilities through profit or loss |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedAsUponInitialRecognition |
| 3092 |
1243 - Disclosure - Other Financial Liabilities at Fair Value Through Profit or Loss - Summary of Other Financial Liabilities at Fair Value Through Profit or Loss (Parenthetical) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureOtherFinancialLiabilitiesAtFairValueThroughProfitOrLossSummaryOfOtherFinancialLiabilitiesAtFairValueThroughProfitOrLossParenthetical |
| 3093 |
Disclosure Of Other Financial Liabilities At Fair Value Through Profit Or Loss [table] |
Table |
* |
* |
ck0001087711:DisclosureOfOtherFinancialLiabilitiesAtFairValueThroughProfitOrLossTable |
| 3094 |
Categories of related parties [axis] |
Axis |
|
|
ifrs-full:CategoriesOfRelatedPartiesAxis |
| 3095 |
Entity's total for related parties [member] |
Member |
|
|
ifrs-full:EntitysTotalForRelatedPartiesMember |
| 3096 |
Santandar UK plc [member] |
Member |
|
|
ck0001087711:CompanyMember |
| 3097 |
Disclosure of other financial liabilities at fair value through profit or loss [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfOtherFinancialLiabilitiesAtFairValueThroughProfitOrLossLineItems |
| 3098 |
Financial liabilities designated at fair value through profit or loss |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedAsUponInitialRecognition |
| 3099 |
Financial liabilities mandatorily at fair value through profit or loss |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:FinancialLiabilitiesMandatorilyAtFairValueThroughProfitOrLoss |
| 3100 |
1244 - Disclosure - Other Financial Liabilities at Fair Value Through Profit or Loss - Additional Information (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureOtherFinancialLiabilitiesAtFairValueThroughProfitOrLossAdditionalInformation |
| 3101 |
Implied Table |
Table |
* |
* |
implied:Table |
| 3102 |
Other financial liabilities at fair value through profit or loss [abstract] |
Abstract |
|
|
ck0001087711:OtherFinancialLiabilitiesAtFairValueThroughProfitOrLossAbstract |
| 3103 |
Net gain (loss) on financial liabilities designated at fair value, attributable to changes in credit risk |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:ChangesInFairValueOfFinancialLiabilityAttributableToChangesInCreditRiskOfLiability |
| 3104 |
Accumulated gain (loss) on financial liabilities designated at fair value, attributable to changes in credit risk |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:AccumulatedChangesInFairValueOfFinancialLiabilityAttributableToChangesInCreditRiskOfLiability |
| 3105 |
Difference between carrying amount of financial liability and amount contractually required to pay at maturity to holder of obligation |
Concept (Monetary) |
As Of |
|
ifrs-full:DifferenceBetweenCarryingAmountOfFinancialLiabilityAndAmountContractuallyRequiredToPayAtMaturityToHolderOfObligation |
| 3106 |
1245 - Disclosure - Deposits by Customers - Schedule of Deposits by Customers (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureDepositsByCustomersScheduleOfDepositsByCustomers |
| 3107 |
Disclosure of deposits from customers [table] |
Table |
* |
* |
ck0001087711:DisclosureOfDepositsFromCustomersTable |
| 3108 |
Classes of financial liabilities [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialLiabilitiesAxis |
| 3109 |
Total [Member] |
Member |
|
|
ifrs-full:FinancialLiabilitiesMember |
| 3110 |
Current and Demand Accounts - [member] |
Member |
|
|
ck0001087711:CurrentAndDemandAccountsMember |
| 3111 |
Savings Accounts [member] |
Member |
|
|
ck0001087711:SavingsAccountsMember |
| 3112 |
Time Deposits [member] |
Member |
|
|
ck0001087711:TimeDepositsMember |
| 3113 |
Amounts due to other Santander UK Group Holdings plc subsidiaries [member] |
Member |
|
|
ck0001087711:AmountsDueToOtherSantanderUKGroupHoldingsPlcSubsidiariesMember |
| 3114 |
Amounts due to Santander UK Group Holdings plc [member] |
Member |
|
|
ck0001087711:AmountsDueToSantanderUkGroupHoldingsPlcMember |
| 3115 |
Amounts Due to Fellow Banco Santander Subsidiaries [member] |
Member |
|
|
ck0001087711:AmountsDueToFellowBancoSantanderSubsidiariesMember |
| 3116 |
Disclosure of deposits from customers [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfDepositsFromCustomersLineItems |
| 3117 |
Deposits from customers |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:DepositsFromCustomers |
| 3118 |
1246 - Disclosure - Deposits by Customers - Schedule of Deposits by Customers (Parenthetical) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureDepositsByCustomersScheduleOfDepositsByCustomersParenthetical |
| 3119 |
Disclosure of deposits from customers [table] |
Table |
* |
* |
ck0001087711:DisclosureOfDepositsFromCustomersTable |
| 3120 |
Classes of financial liabilities [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialLiabilitiesAxis |
| 3121 |
Total [Member] |
Member |
|
|
ifrs-full:FinancialLiabilitiesMember |
| 3122 |
Equity Index Linked Deposits [member] |
Member |
|
|
ck0001087711:EquityIndexLinkedDepositsMember |
| 3123 |
Disclosure of deposits from customers [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfDepositsFromCustomersLineItems |
| 3124 |
Deposits from customers |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:DepositsFromCustomers |
| 3125 |
Capital amount guaranteed or protected |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:CapitalAmountGuaranteedOrProtectedInRespectOfEquityIndexLinkedDeposits |
| 3126 |
Capital amount of return guaranteed |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:AmountOfReturnGuaranteedInRespectOfEquityIndexLinkedDeposits |
| 3127 |
1247 - Disclosure - Deposits by Banks - Schedule of Deposits by Banks (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureDepositsByBanksScheduleOfDepositsByBanks |
| 3128 |
Disclosure Of Deposits From Banks [table] |
Table |
* |
* |
ck0001087711:DisclosureOfDepositsFromBanksTable |
| 3129 |
Classes of financial liabilities [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialLiabilitiesAxis |
| 3130 |
Total [Member] |
Member |
|
|
ifrs-full:FinancialLiabilitiesMember |
| 3131 |
Items in Course of Transmission [member] |
Member |
|
|
ck0001087711:ItemsInCourseOfTransmissionMember |
| 3132 |
Deposits Held as Collateral [member] |
Member |
|
|
ck0001087711:DepositsHeldAsCollateralMember |
| 3133 |
Other Deposits [member] |
Member |
|
|
ck0001087711:OtherDepositsMember |
| 3134 |
Amounts due to Santander UK subsidiaries [member] |
Member |
|
|
ck0001087711:AmountsDueToSantanderUKSubsidiariesMember |
| 3135 |
Disclosure of deposits from banks [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfDepositsFromBanksLineItems |
| 3136 |
Deposits from banks |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:DepositsFromBanks |
| 3137 |
1248 - Disclosure - Deposits by Banks - Schedule of Deposits by Banks (Parenthetical) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureDepositsByBanksScheduleOfDepositsByBanksParenthetical |
| 3138 |
Implied Table |
Table |
* |
* |
implied:Table |
| 3139 |
Disclosure of deposits from banks [abstract] |
Abstract |
|
|
ck0001087711:DisclosureOfDepositsFromBanksAbstract |
| 3140 |
Drawdown from TFS |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:DrawdownFromTermFundingScheme |
| 3141 |
1249 - Disclosure - Repurchase Agreements - Non Trading - Summary of Repurchase Agreements Non Trading (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureRepurchaseAgreementsNonTradingSummaryOfRepurchaseAgreementsNonTrading |
| 3142 |
Disclosure Of Repurchase Agreements [table] |
Table |
* |
* |
ck0001087711:DisclosureOfRepurchaseAgreementsTable |
| 3143 |
Types of agreement [axis] |
Axis |
|
|
ck0001087711:TypesOfAgreementAxis |
| 3144 |
Types of agreement [domain] |
Member |
|
|
ck0001087711:TypesOfAgreementDomain |
| 3145 |
Agreements with banks [member] |
Member |
|
|
ck0001087711:AgreementsWithBanksMember |
| 3146 |
Agreements with customers [member] |
Member |
|
|
ck0001087711:AgreementsWithCustomersMember |
| 3147 |
Disclosure Of Repurchase Agreements [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfRepurchaseAgreementsLineItems |
| 3148 |
Repurchase agreements - non trading |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:RepurchaseAgreementsAndCashCollateralOnSecuritiesLent |
| 3149 |
1250 - Disclosure - Debt Securities In Issue - Summary of Debt Securities in Issue (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureDebtSecuritiesInIssueSummaryOfDebtSecuritiesInIssue |
| 3150 |
Debt Securities in Issue [Table] |
Table |
* |
* |
ck0001087711:DebtSecuritiesInIssueTable |
| 3151 |
Classes of financial liabilities [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialLiabilitiesAxis |
| 3152 |
Total [Member] |
Member |
|
|
ifrs-full:FinancialLiabilitiesMember |
| 3153 |
Medium Term Notes [member] |
Member |
|
|
ck0001087711:MediumTermNotes1Member |
| 3154 |
Euro 35bn Global Covered Bond Programme [member] |
Member |
|
|
ck0001087711:EuroThirtyFiveBillionGlobalCoveredBondProgrammeMember |
| 3155 |
Certificates of Deposit [member] |
Member |
|
|
ck0001087711:CertificateOfDepositMember |
| 3156 |
Credit Linked Note [member] |
Member |
|
|
ck0001087711:CreditLinkedNoteMember |
| 3157 |
Securitisation Programmes [member] |
Member |
|
|
ck0001087711:SecuritisationProgrammesMember |
| 3158 |
Classes of financial instruments [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialInstrumentsAxis |
| 3159 |
Financial instruments, class [member] |
Member |
|
|
ifrs-full:ClassesOfFinancialInstrumentsMember |
| 3160 |
US$30bn Euro Medium Term Note Programme [member] |
Member |
|
|
ck0001087711:USDollarThirtyBillionEuroMediumTermNoteProgrammeMember |
| 3161 |
Euro 30bn Euro Medium Term Note Programme [member] |
Member |
|
|
ck0001087711:EuroThirtyBillionEuroMediumTermNoteProgrammeMember |
| 3162 |
US SEC - Registered - Santander UK plc [member] |
Member |
|
|
ck0001087711:USSECRegisteredSantanderUKPlcMember |
| 3163 |
US$20bn Commercial Paper Programmes [member] |
Member |
|
|
ck0001087711:USDollarTwentyBillionCommercialPaperProgrammeMember |
| 3164 |
Debt securities in issue [line items] |
LineItems |
|
|
ck0001087711:DebtSecuritiesInIssueLineItems |
| 3165 |
Debt Securities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:DebtSecurities |
| 3166 |
Credit Linked Notes |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:CreditLinkedNotesIssued |
| 3167 |
1251 - Disclosure - Debt Securities In Issue - Summary of Debt Securities in Issue (Parenthetical) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureDebtSecuritiesInIssueSummaryOfDebtSecuritiesInIssueParenthetical |
| 3168 |
Debt Securities in Issue [Table] |
Table |
* |
* |
ck0001087711:DebtSecuritiesInIssueTable |
| 3169 |
Classes of financial liabilities [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialLiabilitiesAxis |
| 3170 |
Total [Member] |
Member |
|
|
ifrs-full:FinancialLiabilitiesMember |
| 3171 |
Medium Term Notes [member] |
Member |
|
|
ck0001087711:MediumTermNotes1Member |
| 3172 |
Euro 35bn Global Covered Bond Programme [member] |
Member |
|
|
ck0001087711:EuroThirtyFiveBillionGlobalCoveredBondProgrammeMember |
| 3173 |
Classes of financial instruments [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialInstrumentsAxis |
| 3174 |
Financial instruments, class [member] |
Member |
|
|
ifrs-full:ClassesOfFinancialInstrumentsMember |
| 3175 |
US$30bn Euro Medium Term Note Programme [member] |
Member |
|
|
ck0001087711:USDollarThirtyBillionEuroMediumTermNoteProgrammeMember |
| 3176 |
Euro 30bn Euro Medium Term Note Programme [member] |
Member |
|
|
ck0001087711:EuroThirtyBillionEuroMediumTermNoteProgrammeMember |
| 3177 |
US$20bn Commercial Paper Programmes [member] |
Member |
|
|
ck0001087711:USDollarTwentyBillionCommercialPaperProgrammeMember |
| 3178 |
Debt securities in issue [line items] |
LineItems |
|
|
ck0001087711:DebtSecuritiesInIssueLineItems |
| 3179 |
Notional amount |
Concept (Monetary) |
As Of |
|
ifrs-full:NotionalAmount |
| 3180 |
1252 - Disclosure - Debt Securities In Issue - Additional Information (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureDebtSecuritiesInIssueAdditionalInformation |
| 3181 |
Debt Securities in Issue [Table] |
Table |
* |
* |
ck0001087711:DebtSecuritiesInIssueTable |
| 3182 |
Components of equity [axis] |
Axis |
|
|
ifrs-full:ComponentsOfEquityAxis |
| 3183 |
Equity [member] |
Member |
|
|
ifrs-full:EquityMember |
| 3184 |
PSA Finance UK Limited [member] |
Member |
|
|
ck0001087711:PSAFinanceUKLimitedMember |
| 3185 |
Debt securities in issue [line items] |
LineItems |
|
|
ck0001087711:DebtSecuritiesInIssueLineItems |
| 3186 |
Percentage of losses in portfolio having credit protection |
Concept (Percent) |
For Period |
|
ck0001087711:PercentageOfLossesInPortfolioHavingCreditProtection |
| 3187 |
1253 - Disclosure - Subordinated Liabilities - Schedule of Subordinated Liabilities (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureSubordinatedLiabilitiesScheduleOfSubordinatedLiabilities |
| 3188 |
Implied Table |
Table |
* |
* |
implied:Table |
| 3189 |
Disclosure of Subordinated Liabilities [abstract] |
Abstract |
|
|
ck0001087711:DisclosureOfSubordinatedLiabilitiesAbstract |
| 3190 |
£325m Sterling Preference Shares |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:SterlingPreferenceShares |
| 3191 |
£175m Fixed/Floating Rate Tier One Preferred Income Capital Securities |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:FixedFloatingRateTierOnePreferredIncomeCapitalSecurities |
| 3192 |
Undated subordinated liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:UndatedSubordinatedLiabilities |
| 3193 |
Dated subordinated liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:DatedSubordinatedLiabilities |
| 3194 |
Subordinated liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:SubordinatedLiabilities |
| 3195 |
1254 - Disclosure - Subordinated Liabilities - Schedule of Subordinated Liabilities (Parenthetical) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureSubordinatedLiabilitiesScheduleOfSubordinatedLiabilitiesParenthetical |
| 3196 |
Implied Table |
Table |
* |
* |
implied:Table |
| 3197 |
Disclosure of Subordinated Liabilities [abstract] |
Abstract |
|
|
ck0001087711:DisclosureOfSubordinatedLiabilitiesAbstract |
| 3198 |
325m Sterling Preference Shares, Notional amount |
Concept (Monetary) |
As Of |
|
ck0001087711:SterlingPreferenceSharesNotionalAmount |
| 3199 |
175m Fixed/Floating Rate Tier One Preferred Income Capital Securities, Notional amount |
Concept (Monetary) |
As Of |
|
ck0001087711:FixedFloatingRateTierOnePreferredIncomeCapitalSecuritiesNotionalAmount |
| 3200 |
1255 - Disclosure - Subordinated Liabilities - Additional Information (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureSubordinatedLiabilitiesAdditionalInformation |
| 3201 |
Disclosure of Subordinated Liabilities [table] |
Table |
* |
* |
ck0001087711:DisclosureOfSubordinatedLiabilitiesTable |
| 3202 |
Subsidiaries [axis] |
Axis |
|
|
ifrs-full:SignificantInvestmentsInSubsidiariesAxis |
| 3203 |
Entity's total for subsidiaries [member] |
Member |
|
|
ifrs-full:EntitysTotalForSubsidiariesMember |
| 3204 |
300m Fixed/Floating Rate Non-Cumulative Callable Preference Shares [member] |
Member |
|
|
ck0001087711:ThreeHundredMillionFixedOrFloatingRateNoncumulativeCallablePreferenceSharesMember |
| 3205 |
300m Step-up Callable Perpetual Reserve Capital Instruments [member] |
Member |
|
|
ck0001087711:ThreeHundredMillionStepupCallablePerpetualReserveCapitalInstrumentsMember |
| 3206 |
Classes of Share Capital [Axis] |
Axis |
|
|
ifrs-full:ClassesOfShareCapitalAxis |
| 3207 |
Share capital [member] |
Member |
|
|
ifrs-full:ClassesOfShareCapitalMember |
| 3208 |
175m Sterling Fixed/Floating Rate Tier One Preferred Income Capital Securities [member] |
Member |
|
|
ck0001087711:OneSeventyFiveMillionPoundSterlingFixedFloatingRateTierOnePreferredIncomeCapitalSecuritiesMember |
| 3209 |
10.0625% non-cumulative non-redeemable sterling preference shares [member] |
Member |
|
|
ck0001087711:TenPointZeroSixTwoFivePercentNoncumulativeNonredeemableSterlingPreferenceSharesMember |
| 3210 |
10.375% non-cumulative non-redeemable sterling preference shares [member] |
Member |
|
|
ck0001087711:TenPointThreeSevenFivePercentNoncumulativeNonredeemableSterlingPreferenceSharesMember |
| 3211 |
Types of Financial Liabilities [Axis] |
Axis |
|
|
ifrs-full:TypesOfFinancialLiabilitiesAxis |
| 3212 |
Financial liabilities, type [member] |
Member |
|
|
ifrs-full:FinancialLiabilitiesTypeMember |
| 3213 |
7.375% 20 Year Step-up Perpetual Callable Subordinated Notes [member] |
Member |
|
|
ck0001087711:SevenPointThreeSevenFivePercentTwentyYearStepupPerpetualCallableSubordinatedNotesMember |
| 3214 |
7.125% 30 Year Step-up Perpetual Callable Subordinated Notes [member] |
Member |
|
|
ck0001087711:SevenPointOneTwoFivePercentThirtyYearStepupPerpetualCallableSubordinatedNotesMember |
| 3215 |
10.0625% Exchangeable Capital Securities [member] |
Member |
|
|
ck0001087711:TenPointZeroSixTwoFivePercentExchangeableSubordinatedCapitalSecuritiesMember |
| 3216 |
10.375% exchangeable subordinated capital securities [member] |
Member |
|
|
ck0001087711:TenPointThreeSevenFivePercentExchangeableSubordinatedCapitalSecuritiesMember |
| 3217 |
10.125% Subordinated Guaranteed Bond 2023 [member] |
Member |
|
|
ck0001087711:TenPointOneTwoFivePercentSubordinatedGuaranteedBondTwentyTwentyThreeMember |
| 3218 |
Categories of related parties [axis] |
Axis |
|
|
ifrs-full:CategoriesOfRelatedPartiesAxis |
| 3219 |
Entity's total for related parties [member] |
Member |
|
|
ifrs-full:EntitysTotalForRelatedPartiesMember |
| 3220 |
Santander UK Plc [member] |
Member |
|
|
ck0001087711:SantanderUkPlcMember |
| 3221 |
Disclosure of subordinated liabilities [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfSubordinatedLiabilitiesLineItems |
| 3222 |
Notional amount |
Concept (Monetary) |
As Of |
|
ck0001087711:FixedFloatingRateTierOnePreferredIncomeCapitalSecuritiesNotionalAmount |
| 3223 |
Notional amount |
Concept (Monetary) |
As Of |
|
ck0001087711:StepUpCallablePerpetualReserveCapitalInstrumentsNotionalAmount |
| 3224 |
Defaults of principal, interest or other breaches with respect to subordinated liabilities |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:DefaultsOfPrincipalInterestOrOtherBreachesWithRespectToSubordinatedLiabilities |
| 3225 |
Interest rate |
Concept (Percent) |
As Of |
|
ifrs-full:BorrowingsInterestRate |
| 3226 |
Par value per share |
Concept (Share) |
As Of |
|
ifrs-full:ParValuePerShare |
| 3227 |
1256 - Disclosure - Subordinated Liabilities - Summary of Undated Subordinated Liabilities (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureSubordinatedLiabilitiesSummaryOfUndatedSubordinatedLiabilities |
| 3228 |
Disclosure of Subordinated Liabilities [table] |
Table |
* |
* |
ck0001087711:DisclosureOfSubordinatedLiabilitiesTable |
| 3229 |
Types of Financial Liabilities [Axis] |
Axis |
|
|
ifrs-full:TypesOfFinancialLiabilitiesAxis |
| 3230 |
Financial liabilities, type [member] |
Member |
|
|
ifrs-full:FinancialLiabilitiesTypeMember |
| 3231 |
10.0625% Exchangeable Capital Securities [member] |
Member |
|
|
ck0001087711:TenPointZeroSixTwoFivePercentExchangeableSubordinatedCapitalSecuritiesMember |
| 3232 |
7.375% 20 Year Step-up Perpetual Callable Subordinated Notes [member] |
Member |
|
|
ck0001087711:SevenPointThreeSevenFivePercentTwentyYearStepupPerpetualCallableSubordinatedNotesMember |
| 3233 |
7.125% 30 Year Step-up Perpetual Callable Subordinated Notes [member] |
Member |
|
|
ck0001087711:SevenPointOneTwoFivePercentThirtyYearStepupPerpetualCallableSubordinatedNotesMember |
| 3234 |
Disclosure of subordinated liabilities [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfSubordinatedLiabilitiesLineItems |
| 3235 |
Undated subordinated liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:UndatedSubordinatedLiabilities |
| 3236 |
First call date |
Concept (Text/String) |
For Period |
|
ck0001087711:InitialCallDateOfUndatedSubordinatedLiabilities |
| 3237 |
1257 - Disclosure - Subordinated Liabilities - Summary of Undated Subordinated Liabilities (Parenthetical) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureSubordinatedLiabilitiesSummaryOfUndatedSubordinatedLiabilitiesParenthetical |
| 3238 |
Disclosure of Subordinated Liabilities [table] |
Table |
* |
* |
ck0001087711:DisclosureOfSubordinatedLiabilitiesTable |
| 3239 |
Types of Financial Liabilities [Axis] |
Axis |
|
|
ifrs-full:TypesOfFinancialLiabilitiesAxis |
| 3240 |
Financial liabilities, type [member] |
Member |
|
|
ifrs-full:FinancialLiabilitiesTypeMember |
| 3241 |
10.0625% Exchangeable Capital Securities [member] |
Member |
|
|
ck0001087711:TenPointZeroSixTwoFivePercentExchangeableSubordinatedCapitalSecuritiesMember |
| 3242 |
7.375% 20 Year Step-up Perpetual Callable Subordinated Notes [member] |
Member |
|
|
ck0001087711:SevenPointThreeSevenFivePercentTwentyYearStepupPerpetualCallableSubordinatedNotesMember |
| 3243 |
7.125% 30 Year Step-up Perpetual Callable Subordinated Notes [member] |
Member |
|
|
ck0001087711:SevenPointOneTwoFivePercentThirtyYearStepupPerpetualCallableSubordinatedNotesMember |
| 3244 |
Disclosure of subordinated liabilities [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfSubordinatedLiabilitiesLineItems |
| 3245 |
Interest rate |
Concept (Percent) |
As Of |
|
ifrs-full:BorrowingsInterestRate |
| 3246 |
Notes maturity, year |
Concept (xbrli:durationItemType) |
For Period |
|
ck0001087711:BorrowingsMaturityPeriod |
| 3247 |
Maturity period |
Concept (Text/String) |
For Period |
|
ifrs-full:BorrowingsMaturity |
| 3248 |
1258 - Disclosure - Subordinated Liabilities - Summary of Dated Subordinated Liabilities (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureSubordinatedLiabilitiesSummaryOfDatedSubordinatedLiabilities |
| 3249 |
Disclosure of Subordinated Liabilities [table] |
Table |
* |
* |
ck0001087711:DisclosureOfSubordinatedLiabilitiesTable |
| 3250 |
Types of Financial Liabilities [Axis] |
Axis |
|
|
ifrs-full:TypesOfFinancialLiabilitiesAxis |
| 3251 |
Financial liabilities, type [member] |
Member |
|
|
ifrs-full:FinancialLiabilitiesTypeMember |
| 3252 |
10.125% Subordinated Guaranteed Bond 2023 [member] |
Member |
|
|
ck0001087711:TenPointOneTwoFivePercentSubordinatedGuaranteedBondTwentyTwentyThreeMember |
| 3253 |
9.625% Subordinated Notes 2023 [member] |
Member |
|
|
ck0001087711:NinePointSixTwoFivePercentSubordinatedNotesTwentyTwentyThreeMember |
| 3254 |
5% Subordinated Notes 2023 [member] |
Member |
|
|
ck0001087711:FivePercentSubordinatedNotesTwentyTwentyThreeMember |
| 3255 |
4.75% Subordinated Notes 2025 [member] |
Member |
|
|
ck0001087711:FourPointSevenFivePercentSubordinatedNotesTwentyTwentyFiveMember |
| 3256 |
7.95% Subordinated Notes 2029 [member] |
Member |
|
|
ck0001087711:SevenPointNineFivePercentSubordinatedNotesTwentyTwentyNineMember |
| 3257 |
6.50% Subordinated Notes 2030 [member] |
Member |
|
|
ck0001087711:SixPointFivePercentSubordinatedNotesTwentyThirtyMember |
| 3258 |
8.963% Subordinated Notes 2045 [member] |
Member |
|
|
ck0001087711:EightPointNineSixThreePercentNotesTwentyFortyFiveMember |
| 3259 |
5.875% Subordinated Notes 2031 [member] |
Member |
|
|
ck0001087711:FivePointEightSevenFivePercentSubordinatedNotesTwentyThirtyOneMember |
| 3260 |
5.625% Subordinated Notes 2045 [member] |
Member |
|
|
ck0001087711:FivePointSixTwoFivePercentSubordinatedNotesTwentyFortyFiveMember |
| 3261 |
Disclosure of subordinated liabilities [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfSubordinatedLiabilitiesLineItems |
| 3262 |
Dated subordinated liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:DatedSubordinatedLiabilities |
| 3263 |
Maturity period |
Concept (Text/String) |
For Period |
|
ifrs-full:BorrowingsMaturity |
| 3264 |
1259 - Disclosure - Subordinated Liabilities - Summary of Dated Subordinated Liabilities (Parenthetical) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureSubordinatedLiabilitiesSummaryOfDatedSubordinatedLiabilitiesParenthetical |
| 3265 |
Disclosure of Subordinated Liabilities [table] |
Table |
* |
* |
ck0001087711:DisclosureOfSubordinatedLiabilitiesTable |
| 3266 |
Types of Financial Liabilities [Axis] |
Axis |
|
|
ifrs-full:TypesOfFinancialLiabilitiesAxis |
| 3267 |
Financial liabilities, type [member] |
Member |
|
|
ifrs-full:FinancialLiabilitiesTypeMember |
| 3268 |
10.125% Subordinated Guaranteed Bond 2023 [member] |
Member |
|
|
ck0001087711:TenPointOneTwoFivePercentSubordinatedGuaranteedBondTwentyTwentyThreeMember |
| 3269 |
9.625% Subordinated Notes 2023 [member] |
Member |
|
|
ck0001087711:NinePointSixTwoFivePercentSubordinatedNotesTwentyTwentyThreeMember |
| 3270 |
5% Subordinated Notes 2023 [member] |
Member |
|
|
ck0001087711:FivePercentSubordinatedNotesTwentyTwentyThreeMember |
| 3271 |
4.75% Subordinated Notes 2025 [member] |
Member |
|
|
ck0001087711:FourPointSevenFivePercentSubordinatedNotesTwentyTwentyFiveMember |
| 3272 |
7.95% Subordinated Notes 2029 [member] |
Member |
|
|
ck0001087711:SevenPointNineFivePercentSubordinatedNotesTwentyTwentyNineMember |
| 3273 |
6.50% Subordinated Notes 2030 [member] |
Member |
|
|
ck0001087711:SixPointFivePercentSubordinatedNotesTwentyThirtyMember |
| 3274 |
8.963% Subordinated Notes 2045 [member] |
Member |
|
|
ck0001087711:EightPointNineSixThreePercentNotesTwentyFortyFiveMember |
| 3275 |
5.875% Subordinated Notes 2031 [member] |
Member |
|
|
ck0001087711:FivePointEightSevenFivePercentSubordinatedNotesTwentyThirtyOneMember |
| 3276 |
5.625% Subordinated Notes 2045 [member] |
Member |
|
|
ck0001087711:FivePointSixTwoFivePercentSubordinatedNotesTwentyFortyFiveMember |
| 3277 |
Disclosure of subordinated liabilities [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfSubordinatedLiabilitiesLineItems |
| 3278 |
Interest rate |
Concept (Percent) |
As Of |
|
ifrs-full:BorrowingsInterestRate |
| 3279 |
Notional amount |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:SubordinatedNotesNotionalAmount |
| 3280 |
1260 - Disclosure - Provisions - Summary of Provisions Reconciliation (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureProvisionsSummaryOfProvisionsReconciliation |
| 3281 |
Disclosure of other provisions [table] |
Table |
* |
* |
ifrs-full:DisclosureOfOtherProvisionsTable |
| 3282 |
Classes of other provisions [axis] |
Axis |
|
|
ifrs-full:ClassesOfProvisionsAxis |
| 3283 |
Other provisions [member] |
Member |
|
|
ifrs-full:OtherProvisionsMember |
| 3284 |
FSCS and Bank Levy [member] |
Member |
|
|
ck0001087711:FSCSAndBankLevyMember |
| 3285 |
PPI [member] |
Member |
|
|
ck0001087711:PPIMember |
| 3286 |
Other products [member] |
Member |
|
|
ck0001087711:OtherProductsMember |
| 3287 |
Vacant Property [member] |
Member |
|
|
ck0001087711:VacantPropertyMember |
| 3288 |
Off-Balance Sheet [member] |
Member |
|
|
ck0001087711:OffBalanceSheetMember |
| 3289 |
Regulatory and other [member] |
Member |
|
|
ck0001087711:RegulatoryAndOtherMember |
| 3290 |
Maturity [axis] |
Axis |
|
|
ifrs-full:MaturityAxis |
| 3291 |
Aggregated time bands [member] |
Member |
|
|
ifrs-full:AggregatedTimeBandsMember |
| 3292 |
Not Later Than 1 Year [member] |
Member |
|
|
ifrs-full:NotLaterThanOneYearMember |
| 3293 |
More than One Year [member] |
Member |
|
|
ifrs-full:LaterThanOneYearMember |
| 3294 |
Disclosure of other provisions [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfOtherProvisionsLineItems |
| 3295 |
Beginning balance |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:Provisions |
| 3296 |
Reallocation of ECL on off-balance sheet exposures |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:ReallocationOfExpectedCreditLossOnUndrawnExposuresRelatedToLoanCommitments |
| 3297 |
Balance on January 1 2018 |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:ProvisionsOnAdoptionOfIFRS9 |
| 3298 |
Additional provisions |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:AdditionalProvisionsOtherProvisions |
| 3299 |
Provisions released (see Note 8) |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:UnusedProvisionReversedOtherProvisions |
| 3300 |
Utilisation |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:ProvisionUsedOtherProvisions |
| 3301 |
Other |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:NewProvisionsOtherProvisions |
| 3302 |
Transfers |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesOtherProvisions |
| 3303 |
Ending balance |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:Provisions |
| 3304 |
To be settled: |
Abstract |
|
|
ck0001087711:ToBeSettledAbstract |
| 3305 |
Ending balance |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:Provisions |
| 3306 |
1261 - Disclosure - Provisions - Summary of Provisions Reconciliation (Parenthetical) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureProvisionsSummaryOfProvisionsReconciliationParenthetical |
| 3307 |
Disclosure of other provisions [table] |
Table |
* |
* |
ifrs-full:DisclosureOfOtherProvisionsTable |
| 3308 |
Classes of other provisions [axis] |
Axis |
|
|
ifrs-full:ClassesOfProvisionsAxis |
| 3309 |
Other provisions [member] |
Member |
|
|
ifrs-full:OtherProvisionsMember |
| 3310 |
FSCS and Bank Levy [member] |
Member |
|
|
ck0001087711:FSCSAndBankLevyMember |
| 3311 |
Disclosure of other provisions [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfOtherProvisionsLineItems |
| 3312 |
Other |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:NewProvisionsOtherProvisions |
| 3313 |
1262 - Disclosure - Provisions - Additional Information (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureProvisionsAdditionalInformation |
| 3314 |
Disclosure of other provisions [table] |
Table |
* |
* |
ifrs-full:DisclosureOfOtherProvisionsTable |
| 3315 |
Classes of other provisions [axis] |
Axis |
|
|
ifrs-full:ClassesOfProvisionsAxis |
| 3316 |
Other provisions [member] |
Member |
|
|
ifrs-full:OtherProvisionsMember |
| 3317 |
PPI [member] |
Member |
|
|
ck0001087711:PPIMember |
| 3318 |
Provision for Past Business Review [member] |
Member |
|
|
ck0001087711:ProvisionForPastBusinessReviewMember |
| 3319 |
August 2016 FCA Papers [member] |
Member |
|
|
ck0001087711:AugustTwoThousandSixteenFCAPapersMember |
| 3320 |
Other products [member] |
Member |
|
|
ck0001087711:OtherProductsMember |
| 3321 |
FSCS And Bank Levy Financial Services Compensation Scheme [member] |
Member |
|
|
ck0001087711:FscsAndBankLevyFinancialServicesCompensationSchemeMember |
| 3322 |
Regulatory Related Uk Bank Levy [member] |
Member |
|
|
ck0001087711:RegulatoryRelatedUKBankLevyMember |
| 3323 |
Compliance with Consumer Credit Act [member] |
Member |
|
|
ck0001087711:ComplianceWithConsumerCreditActMember |
| 3324 |
Historical probate and bereavement practices [member] |
Member |
|
|
ck0001087711:HistoricalProbateAndBereavementPracticesMember |
| 3325 |
Categories of related parties [axis] |
Axis |
|
|
ifrs-full:CategoriesOfRelatedPartiesAxis |
| 3326 |
Entity's total for related parties [member] |
Member |
|
|
ifrs-full:EntitysTotalForRelatedPartiesMember |
| 3327 |
Financial Ombudsman Service [member] |
Member |
|
|
ck0001087711:FinancialOmbudsmanServiceMember |
| 3328 |
Santander UK Group Holdings plc [member] |
Member |
|
|
ifrs-full:ParentMember |
| 3329 |
Key Drivers PPI [axis] |
Axis |
|
|
ck0001087711:KeyDriversPPIAxis |
| 3330 |
Key Drivers PPI [domain] |
Member |
|
|
ck0001087711:KeyDriversPpiDomain |
| 3331 |
Plevin redress [member] |
Member |
|
|
ck0001087711:PlevinRedressMember |
| 3332 |
Range [axis] |
Axis |
|
|
ifrs-full:RangeAxis |
| 3333 |
Ranges [member] |
Member |
|
|
ifrs-full:RangesMember |
| 3334 |
Top of Range [member] |
Member |
|
|
ifrs-full:TopOfRangeMember |
| 3335 |
Bottom of Range [member] |
Member |
|
|
ifrs-full:BottomOfRangeMember |
| 3336 |
Disclosure of other provisions [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfOtherProvisionsLineItems |
| 3337 |
Provision linked to future claims levels |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:FutureExpectedProvisionAmount |
| 3338 |
Impact on the PPI misselling element of provision |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:SensitivityAnalysisIncreaseDecreaseInProvisionValue |
| 3339 |
Overturn rate percentage |
Concept (Percent) |
For Period |
|
ck0001087711:OverturnRatePercentage |
| 3340 |
Average overturn rate percentage |
Concept (Percent) |
For Period |
|
ck0001087711:AverageOverturnRatePercentage |
| 3341 |
Provisions |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:Provisions |
| 3342 |
Additional provision charge |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:AdditionalProvisionsOtherProvisions |
| 3343 |
Provisions released |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:UnusedProvisionReversedOtherProvisions |
| 3344 |
Reduction in amount that FSCS owes to HM Treasury |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:AmountPayableToHmTreasury |
| 3345 |
Regulatory costs related to Financial Services Compensation Scheme (FSCS) |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:ExpensesRelatedToFinancialServicesCompensationScheme |
| 3346 |
Bank levy rate |
Concept (Percent) |
For Period |
|
ck0001087711:BankLevyRate |
| 3347 |
UK Bank Levy |
Concept (Percent) |
For Period |
|
ck0001087711:UKBankLevyRate |
| 3348 |
Cost of UK Bank Levy Incurred |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:ExpensesRelatedToUKBankLevy |
| 3349 |
Amount paid as UK Bank Levy |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:UKBankLevyPaid |
| 3350 |
Additional operational risk losses and restructuring charges |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:AdditionalProvisionsOtherProvisionsOperationalRiskLossesAndRestructuringCharges |
| 3351 |
1263 - Disclosure - Provisions - Summary of Key Drivers of PPI Provision Balance and Forecast Assumptions Used in Calculating Provision (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureProvisionsSummaryOfKeyDriversOfPPIProvisionBalanceAndForecastAssumptionsUsedInCalculatingProvision |
| 3352 |
Disclosure of other provisions [table] |
Table |
* |
* |
ifrs-full:DisclosureOfOtherProvisionsTable |
| 3353 |
Classes of other provisions [axis] |
Axis |
|
|
ifrs-full:ClassesOfProvisionsAxis |
| 3354 |
Other provisions [member] |
Member |
|
|
ifrs-full:OtherProvisionsMember |
| 3355 |
PPI [member] |
Member |
|
|
ck0001087711:PPIMember |
| 3356 |
Key Drivers PPI [axis] |
Axis |
|
|
ck0001087711:KeyDriversPPIAxis |
| 3357 |
Key Drivers PPI [domain] |
Member |
|
|
ck0001087711:KeyDriversPpiDomain |
| 3358 |
Inbound Complaints [member] |
Member |
|
|
ck0001087711:InboundComplaintsMember |
| 3359 |
Outbound Complaints [member] |
Member |
|
|
ck0001087711:OutboundComplaintsMember |
| 3360 |
Response Rate to Outbound Contact [member] |
Member |
|
|
ck0001087711:ResponseRateToOutboundContactMember |
| 3361 |
Average Uphold Rate Per Claim [member] |
Member |
|
|
ck0001087711:AverageUpholdRatePerClaimMember |
| 3362 |
Average Redress Per Claim [member] |
Member |
|
|
ck0001087711:AverageRedressPerClaimMember |
| 3363 |
Disclosure of other provisions [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfOtherProvisionsLineItems |
| 3364 |
Cumulative to 31 December 2018 |
Concept (Percent) |
For Period |
|
ck0001087711:ProvisionCumulativeToYearEndRate |
| 3365 |
Cumulative to 31 December 2018 |
Concept (Integer) |
For Period |
|
ck0001087711:ProvisionCumulativeToYearEndNumber |
| 3366 |
Cumulative to 31 December 2018 |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:ProvisionCumulativeToYearEndAmount |
| 3367 |
Future expected (unaudited) |
Concept (Percent) |
For Period |
|
ck0001087711:FutureExpectedProvisionRate |
| 3368 |
Future expected (unaudited) |
Concept (Integer) |
For Period |
|
ck0001087711:FutureExpectedProvisionNumber |
| 3369 |
Future expected (unaudited) |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:FutureExpectedProvisionAmount |
| 3370 |
Sensitivity analysis rate |
Concept (Percent) |
For Period |
|
ck0001087711:SensitivityAnalysisRate |
| 3371 |
Sensitivity analysis number |
Concept (Integer) |
For Period |
|
ck0001087711:SensitivityAnalysisNumber |
| 3372 |
Sensitivity analysis amount |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:SensitivityAnalysisAmount |
| 3373 |
Sensitivity analysis increase/decrease in provision |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:SensitivityAnalysisIncreaseDecreaseInProvisionValue |
| 3374 |
1264 - Disclosure - Provisions - Summary of Key Drivers of PPI Provision Balance and Forecast Assumptions Used in Calculating Provision (Parenthetical) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureProvisionsSummaryOfKeyDriversOfPPIProvisionBalanceAndForecastAssumptionsUsedInCalculatingProvisionParenthetical |
| 3375 |
Implied Table |
Table |
* |
* |
implied:Table |
| 3376 |
Disclosure of other provisions [abstract] |
Abstract |
|
|
ifrs-full:DisclosureOfOtherProvisionsAbstract |
| 3377 |
Cumulative average value |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:CumulativeAverageValue |
| 3378 |
Future average value |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:FutureAverageValue |
| 3379 |
1265 - Disclosure - Retirement Benefit Plans - Summary of Retirement Benefit Plans (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureRetirementBenefitPlansSummaryOfRetirementBenefitPlans |
| 3380 |
Disclosure of net defined benefit liability (asset) [table] |
Table |
* |
* |
ifrs-full:DisclosureOfNetDefinedBenefitLiabilityAssetTable |
| 3381 |
Defined benefit plans [axis] |
Axis |
|
|
ifrs-full:DefinedBenefitPlansAxis |
| 3382 |
Defined benefit plans [member] |
Member |
|
|
ifrs-full:DefinedBenefitPlansMember |
| 3383 |
Surplus [member] |
Member |
|
|
ck0001087711:SurplusMember |
| 3384 |
Deficit [member] |
Member |
|
|
ck0001087711:DeficitsMember |
| 3385 |
Legal entity [axis] |
Axis |
|
|
dei:LegalEntityAxis |
| 3386 |
Entity [Domain] |
Member |
|
|
dei:EntityDomain |
| 3387 |
Santander UK Group [member] |
Member |
|
|
ck0001087711:SantanderUKGroupMember |
| 3388 |
Net defined benefit liability (asset) [axis] |
Axis |
|
|
ifrs-full:NetDefinedBenefitLiabilityAssetAxis |
| 3389 |
Net defined benefit liability (asset) [member] |
Member |
|
|
ifrs-full:NetDefinedBenefitLiabilityAssetMember |
| 3390 |
Funded Defined Benefit Pension Scheme [member] |
Member |
|
|
ifrs-full:WhollyOrPartlyFundedDefinedBenefitPlansMember |
| 3391 |
Unfunded Defined Benefit Pension Scheme [member] |
Member |
|
|
ifrs-full:WhollyUnfundedDefinedBenefitPlansMember |
| 3392 |
Disclosure of net defined benefit liability (asset) [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfNetDefinedBenefitLiabilityAssetLineItems |
| 3393 |
Assets/(liabilities) |
Abstract |
|
|
ifrs-full:NetAssetsLiabilitiesAbstract |
| 3394 |
Surplus (deficit) in plan |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:SurplusDeficitInPlan |
| 3395 |
Total net assets |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:PlanAssetsAtFairValue |
| 3396 |
1266 - Disclosure - Retirement Benefit Plans - Summary of Remeasurement (Gains)/Losses Recognised In Other Comprehensive Income (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureRetirementBenefitPlansSummaryOfRemeasurementGainsLossesRecognisedInOtherComprehensiveIncome |
| 3397 |
Implied Table |
Table |
* |
* |
implied:Table |
| 3398 |
Disclosure of net defined benefit liability (asset) [abstract] |
Abstract |
|
|
ifrs-full:DisclosureOfNetDefinedBenefitLiabilityAssetAbstract |
| 3399 |
Pension remeasurement |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:OtherComprehensiveIncomeBeforeTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans |
| 3400 |
1267 - Disclosure - Retirement Benefit Plans - Additional Information (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureRetirementBenefitPlansAdditionalInformation |
| 3401 |
Disclosure of defined benefit plans [table] |
Table |
* |
* |
ifrs-full:DisclosureOfDefinedBenefitPlansTable |
| 3402 |
Service concession arrangements [axis] |
Axis |
|
|
ifrs-full:ServiceConcessionArrangementsAxis |
| 3403 |
Service concession arrangements [member] |
Member |
|
|
ifrs-full:ServiceConcessionArrangementsMember |
| 3404 |
Deficit Repair Contributions [member] |
Member |
|
|
ck0001087711:DeficitRepairContributionsPlanMember |
| 3405 |
Deficit Repair Group Section Contributions [member] |
Member |
|
|
ck0001087711:DeficitRepairGroupSectionContributionsPlanMember |
| 3406 |
Deficit Group Section Contributions Plan [member] |
Member |
|
|
ck0001087711:DeficitGroupSectionContributionsPlanMember |
| 3407 |
Categories of related parties [axis] |
Axis |
|
|
ifrs-full:CategoriesOfRelatedPartiesAxis |
| 3408 |
Entity's total for related parties [member] |
Member |
|
|
ifrs-full:EntitysTotalForRelatedPartiesMember |
| 3409 |
Santander UK Plc [member] |
Member |
|
|
ck0001087711:SantanderUkPlcMember |
| 3410 |
Santander UK Group [member] |
Member |
|
|
ck0001087711:SantanderUKGroupMember |
| 3411 |
Net defined benefit liability (asset) [axis] |
Axis |
|
|
ifrs-full:NetDefinedBenefitLiabilityAssetAxis |
| 3412 |
Net defined benefit liability (asset) [member] |
Member |
|
|
ifrs-full:NetDefinedBenefitLiabilityAssetMember |
| 3413 |
Present value of defined benefit obligations [member] |
Member |
|
|
ifrs-full:PresentValueOfDefinedBenefitObligationMember |
| 3414 |
Classes of financial assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialAssetsAxis |
| 3415 |
Financial assets, class [member] |
Member |
|
|
ifrs-full:FinancialAssetsMember |
| 3416 |
Equity collar [member] |
Member |
|
|
ck0001087711:EquityCollarMember |
| 3417 |
Legal entity [axis] |
Axis |
|
|
dei:LegalEntityAxis |
| 3418 |
Entity [Domain] |
Member |
|
|
dei:EntityDomain |
| 3419 |
Santander CF Trustee Limited [member] |
Member |
|
|
ck0001087711:SantanderCFTrusteeLimitedMember |
| 3420 |
Santander (UK) Group Pension Scheme Trustees Limited [member] |
Member |
|
|
ck0001087711:SantanderUkGroupPensionSchemeTrusteesLimitedMember |
| 3421 |
Actuarial assumptions [axis] |
Axis |
|
|
ifrs-full:ActuarialAssumptionsAxis |
| 3422 |
Actuarial assumptions [member] |
Member |
|
|
ifrs-full:ActuarialAssumptionsMember |
| 3423 |
Actuarial Assumption of Discount Rates [member] |
Member |
|
|
ifrs-full:ActuarialAssumptionOfDiscountRatesMember |
| 3424 |
Actuarial Assumption of Expected Rates of Inflation [member] |
Member |
|
|
ifrs-full:ActuarialAssumptionOfExpectedRatesOfInflationMember |
| 3425 |
Actuarial assumption of expected rate of pension increases [member] |
Member |
|
|
ifrs-full:ActuarialAssumptionOfExpectedRatesOfPensionIncreasesMember |
| 3426 |
Actuarial assumption of mortality rates [member] |
Member |
|
|
ifrs-full:ActuarialAssumptionOfMortalityRatesMember |
| 3427 |
Disclosure of defined benefit plans [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfDefinedBenefitPlansLineItems |
| 3428 |
Defined contribution expense |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:PostemploymentBenefitExpenseDefinedContributionPlans |
| 3429 |
Key management personnel expense |
Concept (Text/String) |
For Period |
|
ifrs-full:ExplanationOfValueAssignedToKeyAssumption |
| 3430 |
Percentage of employee covered defined benefit pension schemes |
Concept (Percent) |
As Of |
|
ifrs-full:LevelOfParticipationOfEntityComparedWithOtherParticipatingEntities |
| 3431 |
Number of directors selected |
Concept (Integer) |
For Period |
|
ck0001087711:NumberOfBoardOfDirectorsInSubsidiary |
| 3432 |
Number of directors nominated |
Concept (Integer) |
For Period |
|
ck0001087711:NumberOfNominatedDirectorsInSubsidiary |
| 3433 |
Number of trustee directors |
Concept (Integer) |
For Period |
|
ck0001087711:NumberOfTrusteeDirectorsAppointed |
| 3434 |
Actuarial valuation deficit |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:IncreaseDecreaseInDefinedBenefitObligationDueToReasonablyPossibleDecreaseInActuarialAssumption |
| 3435 |
Estimated increase in liabilities in relation to judgment on GMP equalisation |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:GainsLossesArisingFromSettlementsNetDefinedBenefitLiabilityAsset |
| 3436 |
Gross notional value |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:GrossNotionalValuePensionScheme |
| 3437 |
Equity securities hold |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:DescriptionOfAmountsOfEntitysOwnFinancialInstrumentsIncludedInFairValueOfPlanAssets |
| 3438 |
Property occupied |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:DescriptionOfAmountsOfPropertyOccupiedByEntityIncludedInFairValueOfPlanAssets |
| 3439 |
Other assets occupied |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:DescriptionOfAmountsOfOtherAssetsUsedByEntityIncludedInFairValueOfPlanAssets |
| 3440 |
Contribution to scheme based on agreement |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:FundingToNewRecoveryPlanBasedOnNewAgreement |
| 3441 |
Contributions to defined benefit plans |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:ContributionsToDefinedBenefitPlans |
| 3442 |
Annual increase in contibution |
Concept (Percent) |
For Period |
|
ck0001087711:PercentageOfAnnualIncreaseInContributionsToPensionScheme |
| 3443 |
Maturity date for contribution |
Concept (Text/String) |
For Period |
|
ifrs-full:DescriptionOfFundingArrangementsAndFundingPolicyThatAffectFutureContributions |
| 3444 |
Surplus (deficit) in plan |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:SurplusDeficitInPlan |
| 3445 |
Improvements to life expectancy of female employees |
Concept (Percent) |
For Period |
|
ck0001087711:LifeExpectancyImprovementRateOfFemaleEmployees |
| 3446 |
Improvements to life expectancy of male employees |
Concept (Percent) |
For Period |
|
ck0001087711:LifeExpectancyImprovementRateOfMaleEmployees |
| 3447 |
Average duration of defined benefit obligation |
Concept (Text/String) |
For Period |
|
ck0001087711:DefinedBenefitObligationWeightedAverageDuration |
| 3448 |
1268 - Disclosure - Retirement Benefit Plans - Total Defined Benefit Plan Amount Charged to Income Statement (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureRetirementBenefitPlansTotalDefinedBenefitPlanAmountChargedToIncomeStatement |
| 3449 |
Implied Table |
Table |
* |
* |
implied:Table |
| 3450 |
Disclosure of net defined benefit liability (asset) [abstract] |
Abstract |
|
|
ifrs-full:DisclosureOfNetDefinedBenefitLiabilityAssetAbstract |
| 3451 |
Net interest income |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:InterestExpenseIncomeNetDefinedBenefitLiabilityAsset |
| 3452 |
Current service cost |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:CurrentServiceCostNetDefinedBenefitLiabilityAsset |
| 3453 |
Past service cost |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:PastServiceCostNetDefinedBenefitLiabilityAsset |
| 3454 |
Administration costs |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:AdministrationCostsNetDefinedBenefitLiabilityAsset |
| 3455 |
Total |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:IncreaseDecreaseInNetDefinedBenefitLiabilityAsset |
| 3456 |
1269 - Disclosure - Retirement Benefit Plans - Summary of Amounts Recognised in Other Comprehensive Income (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureRetirementBenefitPlansSummaryOfAmountsRecognisedInOtherComprehensiveIncome |
| 3457 |
Implied Table |
Table |
* |
* |
implied:Table |
| 3458 |
Disclosure of net defined benefit liability (asset) [abstract] |
Abstract |
|
|
ifrs-full:DisclosureOfNetDefinedBenefitLiabilityAssetAbstract |
| 3459 |
Return on plan assets (excluding amounts included in net interest expense) |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:ReturnOnPlanAssetsNetDefinedBenefitLiabilityAsset |
| 3460 |
Actuarial (gains)/losses arising from changes in demographic assumptions |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:ActuarialGainsLossesArisingFromChangesInDemographicAssumptionsNetDefinedBenefitLiabilityAsset |
| 3461 |
Actuarial gains arising from experience adjustments |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:ActuarialGainsLossesArisingFromExperienceAdjustmentsNetDefinedBenefitLiabilityAsset |
| 3462 |
Actuarial (gains)/losses arising from changes in financial assumptions |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:ActuarialGainsLossesArisingFromChangesInFinancialAssumptionsNetDefinedBenefitLiabilityAsset |
| 3463 |
Pension remeasurement |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:OtherComprehensiveIncomeBeforeTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans |
| 3464 |
1270 - Disclosure - Retirement Benefit Plans - Disclosure of Movements in Present Value of Defined Benefit Obligations (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureRetirementBenefitPlansDisclosureOfMovementsInPresentValueOfDefinedBenefitObligations |
| 3465 |
Disclosure of net defined benefit liability (asset) [table] |
Table |
* |
* |
ifrs-full:DisclosureOfNetDefinedBenefitLiabilityAssetTable |
| 3466 |
Net defined benefit liability (asset) [axis] |
Axis |
|
|
ifrs-full:NetDefinedBenefitLiabilityAssetAxis |
| 3467 |
Net defined benefit liability (asset) [member] |
Member |
|
|
ifrs-full:NetDefinedBenefitLiabilityAssetMember |
| 3468 |
Present value of defined benefit obligations [member] |
Member |
|
|
ifrs-full:PresentValueOfDefinedBenefitObligationMember |
| 3469 |
Disclosure of net defined benefit liability (asset) [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfNetDefinedBenefitLiabilityAssetLineItems |
| 3470 |
Beginning balance |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:LiabilityAssetOfDefinedBenefitPlans |
| 3471 |
Current service cost |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:CurrentServiceCostNetDefinedBenefitLiabilityAsset |
| 3472 |
Current service cost paid by subsidiaries |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:CurrentServiceCostPaidBySubsidiaries |
| 3473 |
Current service cost paid by fellow Banco Santander subsidiaries |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:CurrentServiceCostPaidByFellowBancoSantanderSubsidiaries |
| 3474 |
Net interest income |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:InterestExpenseIncomeNetDefinedBenefitLiabilityAsset |
| 3475 |
Employer salary sacrifice contributions |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:ContributionsToPlanByEmployerNetDefinedBenefitLiabilityAsset |
| 3476 |
Past service cost |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:PastServiceCostNetDefinedBenefitLiabilityAsset |
| 3477 |
GMP equalisation cost |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:GainsLossesArisingFromSettlementsNetDefinedBenefitLiabilityAsset |
| 3478 |
Remeasurement due to actuarial movements arising from: |
Abstract |
|
|
ifrs-full:GainLossOnRemeasurementOfNetDefinedBenefitLiabilityAssetAbstract |
| 3479 |
- Changes in demographic assumptions |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:ActuarialGainsLossesArisingFromChangesInDemographicAssumptionsNetDefinedBenefitLiabilityAsset |
| 3480 |
- Experience adjustments |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:ActuarialGainsLossesArisingFromExperienceAdjustmentsNetDefinedBenefitLiabilityAsset |
| 3481 |
- Changes in financial assumptions |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:ActuarialGainsLossesArisingFromChangesInFinancialAssumptionsNetDefinedBenefitLiabilityAsset |
| 3482 |
Benefits paid |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:PaymentsFromPlanNetDefinedBenefitLiabilityAsset |
| 3483 |
Ending balance |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:LiabilityAssetOfDefinedBenefitPlans |
| 3484 |
1271 - Disclosure - Retirement Benefit Plans - Disclosure of Movements in Fair Value of Scheme Assets (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureRetirementBenefitPlansDisclosureOfMovementsInFairValueOfSchemeAssets |
| 3485 |
Disclosure of net defined benefit liability (asset) [table] |
Table |
* |
* |
ifrs-full:DisclosureOfNetDefinedBenefitLiabilityAssetTable |
| 3486 |
Net defined benefit liability (asset) [axis] |
Axis |
|
|
ifrs-full:NetDefinedBenefitLiabilityAssetAxis |
| 3487 |
Net defined benefit liability (asset) [member] |
Member |
|
|
ifrs-full:NetDefinedBenefitLiabilityAssetMember |
| 3488 |
Fair value of scheme assets [member] |
Member |
|
|
ifrs-full:PlanAssetsMember |
| 3489 |
Disclosure of net defined benefit liability (asset) [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfNetDefinedBenefitLiabilityAssetLineItems |
| 3490 |
Beginning balance |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:LiabilityAssetOfDefinedBenefitPlans |
| 3491 |
Interest income |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:InterestExpenseIncomeNetDefinedBenefitLiabilityAsset |
| 3492 |
Contributions paid by employer and scheme members |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:ContributionsToPlanByEmployerNetDefinedBenefitLiabilityAsset |
| 3493 |
Contributions paid by fellow Banco Santander subsidiaries |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:ContributionsPaidByFellowBancoSantanderSubsidiaries |
| 3494 |
Administration costs paid |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:PaymentOfAdministrationCostsNetDefinedBenefitLiabilityAsset |
| 3495 |
Return on plan assets (excluding amounts included in net interest expense) |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:ReturnOnPlanAssetsNetDefinedBenefitLiabilityAsset |
| 3496 |
Benefits paid |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:PaymentsFromPlanNetDefinedBenefitLiabilityAsset |
| 3497 |
Ending balance |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:LiabilityAssetOfDefinedBenefitPlans |
| 3498 |
1272 - Disclosure - Retirement Benefit Plans - Summary of Composition and Fair Value of Plan Assets (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureRetirementBenefitPlansSummaryOfCompositionAndFairValueOfPlanAssets |
| 3499 |
Disclosure of net defined benefit liability (asset) [table] |
Table |
* |
* |
ifrs-full:DisclosureOfNetDefinedBenefitLiabilityAssetTable |
| 3500 |
Availiability Of Prices [axis] |
Axis |
|
|
ck0001087711:AvailiabilityOfPricesAxis |
| 3501 |
Availiability Of Prices [domain] |
Member |
|
|
ck0001087711:AvailiabilityOfPricesDomain |
| 3502 |
Quoted Prices in Active Markets [member] |
Member |
|
|
ck0001087711:QuotedPricesInActiveMarketsMember |
| 3503 |
Prices Not Quoted in Active Markets [member] |
Member |
|
|
ck0001087711:PricesNotQuotedInActiveMarketsMember |
| 3504 |
Disclosure of net defined benefit liability (asset) [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfNetDefinedBenefitLiabilityAssetLineItems |
| 3505 |
UK equities |
Concept (Percent) |
As Of |
|
ck0001087711:DomesticEquitiesPercentageContributedToFairValueOfPlanAssets |
| 3506 |
Overseas equities |
Concept (Percent) |
As Of |
|
ck0001087711:OverseasEquitiesPercentageContributedToFairValueOfPlanAssets |
| 3507 |
Corporate bonds |
Concept (Percent) |
As Of |
|
ck0001087711:CorporateBondsPercentageContributedToFairValueOfPlanAssets |
| 3508 |
Government fixed interest bonds |
Concept (Percent) |
As Of |
|
ck0001087711:GovernmentFixedInterestBondsPercentageContributedToFairValueOfPlanAssets |
| 3509 |
Government index-linked bonds |
Concept (Percent) |
As Of |
|
ck0001087711:GovernmentIndexlinkedBondsPercentageContributedToFairValueOfPlanAssets |
| 3510 |
Property |
Concept (Percent) |
As Of |
|
ck0001087711:PropertyPercentageContributedToFairValueOfPlanAssets |
| 3511 |
Derivatives |
Concept (Percent) |
As Of |
|
ck0001087711:DerivativesPercentageContributedToFairValueOfPlanAssets |
| 3512 |
Cash |
Concept (Percent) |
As Of |
|
ck0001087711:CashAndCashEquivalentsPercentageContributedToFairValueOfPlanAssets |
| 3513 |
Repurchase agreements |
Concept (Percent) |
As Of |
|
ck0001087711:RepurchaseAgreementsPercentageContributedToFairValueOfPlanAssets |
| 3514 |
Other |
Concept (Percent) |
As Of |
|
ck0001087711:OtherAssetsPercentageContributedToFairValueOfPlanAssets |
| 3515 |
Total |
Concept (Percent) |
As Of |
|
ck0001087711:PercentagesContributedToFairValueOfPlanAssets |
| 3516 |
UK equities |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:UkEquitiesAmountContributedToFairValueOfPlanAssets |
| 3517 |
Overseas equities |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:OverseasEquitiesAmountContributedToFairValueOfPlanAssets |
| 3518 |
Corporate bonds |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:CorporateBondsAmountContributedToFairValueOfPlanAssets |
| 3519 |
Government fixed interest bonds |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:GovernmentFixedInterestBondsAmountContributedToFairValueOfPlanAssets |
| 3520 |
Government index-linked bonds |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:GovernmentIndexlinkedBondsAmountContributedToFairValueOfPlanAssets |
| 3521 |
Property |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:PropertyAmountContributedToFairValueOfPlanAssets |
| 3522 |
Derivatives |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:DerivativesAmountContributedToFairValueOfPlanAssets |
| 3523 |
Cash |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:CashAndCashEquivalentsAmountContributedToFairValueOfPlanAssets |
| 3524 |
Repurchase agreements |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:RepurchaseAgreementsAmountContributedToFairValueOfPlanAssets |
| 3525 |
Other |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:OtherAssetsAmountContributedToFairValueOfPlanAssets |
| 3526 |
Total |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:AggregateAmountContributedToFairValueOfPlanAssets |
| 3527 |
1273 - Disclosure - Retirement Benefit Plans - Summary of Principal Actuarial Assumptions Used for Defined Benefit Schemes (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureRetirementBenefitPlansSummaryOfPrincipalActuarialAssumptionsUsedForDefinedBenefitSchemes |
| 3528 |
Implied Table |
Table |
* |
* |
implied:Table |
| 3529 |
Disclosure of sensitivity analysis for actuarial assumptions [abstract] |
Abstract |
|
|
ifrs-full:DisclosureOfSensitivityAnalysisForActuarialAssumptionsAbstract |
| 3530 |
- Discount rate for scheme liabilities |
Concept (Percent) |
As Of |
|
ifrs-full:ActuarialAssumptionOfDiscountRates |
| 3531 |
- General price inflation |
Concept (Percent) |
As Of |
|
ifrs-full:ActuarialAssumptionOfExpectedRatesOfInflation |
| 3532 |
- General salary increase |
Concept (Percent) |
As Of |
|
ifrs-full:ActuarialAssumptionOfExpectedRatesOfSalaryIncreases |
| 3533 |
- Expected rate of pension increase |
Concept (Percent) |
As Of |
|
ifrs-full:ActuarialAssumptionOfExpectedRatesOfPensionIncreases |
| 3534 |
Longevity at 60 for current pensioners, on the valuation date: |
Abstract |
|
|
ck0001087711:LongevityAtSixtyForCurrentPensionersOnValuationDateAbstract |
| 3535 |
- Males |
Concept (xbrli:durationItemType) |
For Period |
|
ck0001087711:LongevityForCurrentPensionersMalesOne |
| 3536 |
- Females |
Concept (xbrli:durationItemType) |
For Period |
|
ck0001087711:LongevityForCurrentPensionersFemalesOne |
| 3537 |
Longevity at 60 for future pensioners currently aged 40, on the valuation date: |
Abstract |
|
|
ck0001087711:LongevityAtSixtyForFuturePensionersCurrentlyAgedFortyOnValuationDateAbstract |
| 3538 |
- Males |
Concept (xbrli:durationItemType) |
For Period |
|
ck0001087711:LongevityForFuturePensionersMalesOne |
| 3539 |
- Females |
Concept (xbrli:durationItemType) |
For Period |
|
ck0001087711:LongevityForFuturePensionersFemalesOne |
| 3540 |
1274 - Disclosure - Retirement Benefit Plans - Summary of Actuarial Assumption Sensitivities (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureRetirementBenefitPlansSummaryOfActuarialAssumptionSensitivities |
| 3541 |
Disclosure of sensitivity analysis for actuarial assumptions [table] |
Table |
* |
* |
ifrs-full:DisclosureOfSensitivityAnalysisForActuarialAssumptionsTable |
| 3542 |
Actuarial assumptions [axis] |
Axis |
|
|
ifrs-full:ActuarialAssumptionsAxis |
| 3543 |
Actuarial assumptions [member] |
Member |
|
|
ifrs-full:ActuarialAssumptionsMember |
| 3544 |
Actuarial Assumption of Discount Rates [member] |
Member |
|
|
ifrs-full:ActuarialAssumptionOfDiscountRatesMember |
| 3545 |
Actuarial Assumption of Expected Rates of Inflation [member] |
Member |
|
|
ifrs-full:ActuarialAssumptionOfExpectedRatesOfInflationMember |
| 3546 |
Actuarial assumption of expected rates of salary increases [member] |
Member |
|
|
ifrs-full:ActuarialAssumptionOfExpectedRatesOfSalaryIncreasesMember |
| 3547 |
Actuarial Assumption of Expected Rates of Mortality [member] |
Member |
|
|
ck0001087711:ActuarialAssumptionOfExpectedRatesOfMortalityMember |
| 3548 |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfSensitivityAnalysisForActuarialAssumptionsLineItems |
| 3549 |
Increase decrease in defined benefit obligation |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:IncreaseDecreaseInDefinedBenefitObligationDueToReasonablyPossibleIncreaseInActuarialAssumption |
| 3550 |
Description of changes in methods and assumptions |
Concept (Text/String) |
For Period |
|
ifrs-full:DescriptionOfChangesInMethodsAndAssumptionsUsedInPreparingSensitivityAnalysisForActuarialAssumptions |
| 3551 |
1275 - Disclosure - Retirement Benefit Plans - Disclosure of Benefits Expected To Be Paid (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureRetirementBenefitPlansDisclosureOfBenefitsExpectedToBePaid |
| 3552 |
Disclosure of net defined benefit liability (asset) [table] |
Table |
* |
* |
ifrs-full:DisclosureOfNetDefinedBenefitLiabilityAssetTable |
| 3553 |
Maturity [axis] |
Axis |
|
|
ifrs-full:MaturityAxis |
| 3554 |
Aggregated time bands [member] |
Member |
|
|
ifrs-full:AggregatedTimeBandsMember |
| 3555 |
Not Later Than 1 Year [member] |
Member |
|
|
ifrs-full:NotLaterThanOneYearMember |
| 3556 |
Later Than 1 Year and Not Later Than 2 Years [member] |
Member |
|
|
ifrs-full:LaterThanOneYearAndNotLaterThanTwoYearsMember |
| 3557 |
2 - 3 years [member] |
Member |
|
|
ifrs-full:LaterThanTwoYearsAndNotLaterThanThreeYearsMember |
| 3558 |
3 - 4 years [member] |
Member |
|
|
ifrs-full:LaterThanThreeYearsAndNotLaterThanFourYearsMember |
| 3559 |
4 - 5 years [member] |
Member |
|
|
ifrs-full:LaterThanFourYearsAndNotLaterThanFiveYearsMember |
| 3560 |
Five Years Ending 2028 [member] |
Member |
|
|
ifrs-full:LaterThanFiveYearsAndNotLaterThanTenYearsMember |
| 3561 |
Disclosure of net defined benefit liability (asset) [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfNetDefinedBenefitLiabilityAssetLineItems |
| 3562 |
Benefits expected to be paid |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:DefinedBenefitPlanExpectedFutureBenefitPayments |
| 3563 |
1276 - Disclosure - Contingent Liabilities and Commitments - Summary of Contingent Liabilities and Commitments (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureContingentLiabilitiesAndCommitmentsSummaryOfContingentLiabilitiesAndCommitments |
| 3564 |
Disclosure of contingent liabilities [table] |
Table |
* |
* |
ifrs-full:DisclosureOfContingentLiabilitiesTable |
| 3565 |
Classes of contingent liabilities [axis] |
Axis |
|
|
ifrs-full:ClassesOfContingentLiabilitiesAxis |
| 3566 |
Contingent liabilities [member] |
Member |
|
|
ifrs-full:ContingentLiabilitiesMember |
| 3567 |
Contingent Liability for Guarantees [Member] |
Member |
|
|
ifrs-full:ContingentLiabilityForGuaranteesMember |
| 3568 |
Loan commitments [member] |
Member |
|
|
ifrs-full:LoanCommitmentsMember |
| 3569 |
Maturity [axis] |
Axis |
|
|
ifrs-full:MaturityAxis |
| 3570 |
Aggregated time bands [member] |
Member |
|
|
ifrs-full:AggregatedTimeBandsMember |
| 3571 |
Not Later Than 1 Year [member] |
Member |
|
|
ifrs-full:NotLaterThanOneYearMember |
| 3572 |
More than One Year [member] |
Member |
|
|
ifrs-full:LaterThanOneYearMember |
| 3573 |
Disclosure of contingent liabilities and commitments [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfContingentLiabilitiesAndCommitmentsLineItems |
| 3574 |
Guarantees given to third parties |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:GuaranteesGivenToThirdParties |
| 3575 |
Formal standby facilities, credit lines and other commitments |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:StandbyFacilitiesCreditLinesAndOtherCommitments |
| 3576 |
Guarantees and formal standby facilities, credit lines and other commitments |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:EstimatedFinancialEffectOfContingentLiabilitiesAndCommitments |
| 3577 |
1277 - Disclosure - Contingent Liabilities and Commitments - Additional Information (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureContingentLiabilitiesAndCommitmentsAdditionalInformation |
| 3578 |
Disclosure of contingent liabilities [table] |
Table |
* |
* |
ifrs-full:DisclosureOfContingentLiabilitiesTable |
| 3579 |
Legal entity [axis] |
Axis |
|
|
dei:LegalEntityAxis |
| 3580 |
Entity [Domain] |
Member |
|
|
dei:EntityDomain |
| 3581 |
Visa Europe Ltd [member] |
Member |
|
|
ck0001087711:VisaEuropeLtdMember |
| 3582 |
Range [axis] |
Axis |
|
|
ifrs-full:RangeAxis |
| 3583 |
Ranges [member] |
Member |
|
|
ifrs-full:RangesMember |
| 3584 |
Bottom of Range [member] |
Member |
|
|
ifrs-full:BottomOfRangeMember |
| 3585 |
Classes of other provisions [axis] |
Axis |
|
|
ifrs-full:ClassesOfProvisionsAxis |
| 3586 |
Other provisions [member] |
Member |
|
|
ifrs-full:OtherProvisionsMember |
| 3587 |
Compliance with Consumer Credit Act [member] |
Member |
|
|
ck0001087711:ComplianceWithConsumerCreditActMember |
| 3588 |
Disclosure of contingent liabilities and commitments [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfContingentLiabilitiesAndCommitmentsLineItems |
| 3589 |
Additional operational risk losses and restructuring charges |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:AdditionalProvisionsOtherProvisionsOperationalRiskLossesAndRestructuringCharges |
| 3590 |
Sale of share capital |
Concept (Percent) |
For Period |
|
ck0001087711:VisaEuropeLtdSaleToVisaInc |
| 3591 |
Losses on litigation settlements |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:LossesOnLitigationSettlements |
| 3592 |
Amount of preferred stock upon indemnity more than one billion |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:AmountOfPreferredStockUponIndemnityMoreThanOneBillion |
| 3593 |
Description of material leasing arrangements by lessee classified as operating lease |
Concept (Text/String) |
For Period |
|
ifrs-full:DescriptionOfMaterialLeasingArrangementsByLesseeClassifiedAsOperatingLease |
| 3594 |
Minimum lease extension period |
Concept (xbrli:durationItemType) |
For Period |
|
ck0001087711:MinimumLeaseExtensionPeriod |
| 3595 |
Terms of notice period |
Concept (xbrli:durationItemType) |
For Period |
|
ck0001087711:TermsOfNoticePeriod |
| 3596 |
Rental expense |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:RentalExpense |
| 3597 |
Minimum rentals |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:MinimumOperatingLeasePayments |
| 3598 |
Sub-lease rental income |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:SubleasePaymentsRecognisedAsExpense |
| 3599 |
Contingent rent expense |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:ContingentRentsRecognisedAsExpenseClassifiedAsOperatingLease |
| 3600 |
1278 - Disclosure - Contingent Liabilities and Commitments - Operating Lease Commitments (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureContingentLiabilitiesAndCommitmentsOperatingLeaseCommitments |
| 3601 |
Disclosure of finance lease and operating lease by lessee [table] |
Table |
* |
* |
ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeTable |
| 3602 |
Maturity [axis] |
Axis |
|
|
ifrs-full:MaturityAxis |
| 3603 |
Aggregated time bands [member] |
Member |
|
|
ifrs-full:AggregatedTimeBandsMember |
| 3604 |
Not Later Than 1 Year [member] |
Member |
|
|
ifrs-full:NotLaterThanOneYearMember |
| 3605 |
Later Than One Year and Not Later Than Five Years [member] |
Member |
|
|
ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember |
| 3606 |
Later Than Five Years [member] |
Member |
|
|
ifrs-full:LaterThanFiveYearsMember |
| 3607 |
Disclosure of finance lease and operating lease by lessee [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeLineItems |
| 3608 |
Lease payments |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:MinimumLeasePaymentsPayableUnderNoncancellableOperatingLease |
| 3609 |
1279 - Disclosure - Share Capital - Schedule of Share Capital Issued and Fully Paid (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureShareCapitalScheduleOfShareCapitalIssuedAndFullyPaid |
| 3610 |
Disclosure of classes of share capital [table] |
Table |
* |
* |
ifrs-full:DisclosureOfClassesOfShareCapitalTable |
| 3611 |
Classes of Share Capital [Axis] |
Axis |
|
|
ifrs-full:ClassesOfShareCapitalAxis |
| 3612 |
Share capital [member] |
Member |
|
|
ifrs-full:ClassesOfShareCapitalMember |
| 3613 |
Ordinary Share Capital [member] |
Member |
|
|
ifrs-full:OrdinarySharesMember |
| 3614 |
Three Hundred Million Preference Shares [member] |
Member |
|
|
ck0001087711:ThreeHundredMillionPreferenceSharesMember |
| 3615 |
Disclosure of classes of share capital [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfClassesOfShareCapitalLineItems |
| 3616 |
Number of shares issued and fully paid |
Concept (Shares) |
As Of |
|
ifrs-full:NumberOfSharesIssuedAndFullyPaid |
| 3617 |
Issued and fully paid share capital |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:IssuedCapital |
| 3618 |
1280 - Disclosure - Share Capital - Schedule of Share Capital Issued and Fully Paid (Parenthetical) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureShareCapitalScheduleOfShareCapitalIssuedAndFullyPaidParenthetical |
| 3619 |
Disclosure of classes of share capital [table] |
Table |
* |
* |
ifrs-full:DisclosureOfClassesOfShareCapitalTable |
| 3620 |
Classes of Share Capital [Axis] |
Axis |
|
|
ifrs-full:ClassesOfShareCapitalAxis |
| 3621 |
Share capital [member] |
Member |
|
|
ifrs-full:ClassesOfShareCapitalMember |
| 3622 |
Ordinary Share Capital [member] |
Member |
|
|
ifrs-full:OrdinarySharesMember |
| 3623 |
Three Hundred Million Preference Shares [member] |
Member |
|
|
ck0001087711:ThreeHundredMillionPreferenceSharesMember |
| 3624 |
Disclosure of classes of share capital [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfClassesOfShareCapitalLineItems |
| 3625 |
Price per share |
Concept (Share) |
As Of |
|
ifrs-full:ParValuePerShare |
| 3626 |
Notional amount |
Concept (Monetary) |
As Of |
|
ifrs-full:NotionalAmount |
| 3627 |
1281 - Disclosure - Share Capital - Summary of Share Premium (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureShareCapitalSummaryOfSharePremium |
| 3628 |
Implied Table |
Table |
* |
* |
implied:Table |
| 3629 |
Disclosure of classes of share capital [abstract] |
Abstract |
|
|
ifrs-full:DisclosureOfClassesOfShareCapitalAbstract |
| 3630 |
Share premium |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:SharePremium |
| 3631 |
1282 - Disclosure - Share Capital - Additional Information (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureShareCapitalAdditionalInformation |
| 3632 |
Disclosure of classes of share capital [table] |
Table |
* |
* |
ifrs-full:DisclosureOfClassesOfShareCapitalTable |
| 3633 |
Components of equity [axis] |
Axis |
|
|
ifrs-full:ComponentsOfEquityAxis |
| 3634 |
Equity [member] |
Member |
|
|
ifrs-full:EquityMember |
| 3635 |
300m Fixed/Floating Rate Non-Cumulative Callable Preference Shares [member] |
Member |
|
|
ck0001087711:ThreeHundredMillionFixedOrFloatingRateNoncumulativeCallablePreferenceSharesMember |
| 3636 |
Disclosure of classes of share capital [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfClassesOfShareCapitalLineItems |
| 3637 |
Sterling preference shares, Notional amount |
Concept (Monetary) |
As Of |
|
ck0001087711:SterlingPreferenceSharesNotionalAmount |
| 3638 |
Notional amount |
Concept (Monetary) |
As Of |
|
ifrs-full:NotionalAmount |
| 3639 |
Fixed non-cumulative annual dividend payable percentage |
Concept (Percent) |
For Period |
|
ck0001087711:FixedNoncumulativeAnnualDividendPayablePercentage |
| 3640 |
Fixed non-cumulative quarterly dividend payable percentage |
Concept (Percent) |
For Period |
|
ck0001087711:FixedNoncumulativeQuarterlyDividendPayablePercentage |
| 3641 |
1283 - Disclosure - Other Equity Instruments - Summary of Other Equity Instruments (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureOtherEquityInstrumentsSummaryOfOtherEquityInstruments |
| 3642 |
Disclosure of other equity instruments [table] |
Table |
* |
* |
ck0001087711:DisclosureOfOtherEquityInstrumentsTable |
| 3643 |
Components of equity [axis] |
Axis |
|
|
ifrs-full:ComponentsOfEquityAxis |
| 3644 |
Equity [member] |
Member |
|
|
ifrs-full:EquityMember |
| 3645 |
300m Step-up Callable Perpetual Reserve Capital Instruments [member] |
Member |
|
|
ck0001087711:ThreeHundredMillionStepupCallablePerpetualReserveCapitalInstrumentsMember |
| 3646 |
500m Perpetual Capital Securities [member] |
Member |
|
|
ck0001087711:FiveHundredMillionPerpetualCapitalSecuritiesTwoThousandTwentyFourMember |
| 3647 |
750m Perpetual Capital Securities [member] |
Member |
|
|
ck0001087711:SevenHundredAndFiftyMillionPerpetualCapitalSecuritiesMember |
| 3648 |
300m Perpetual Capital Securities [member] |
Member |
|
|
ck0001087711:ThreeHundredMillionPerpetualCapitalSecuritiesMember |
| 3649 |
500m Perpetual Capital Securities [member] |
Member |
|
|
ck0001087711:FiveHundredMillionPerpetualCapitalSecuritiesMember |
| 3650 |
Disclosure of other equity instruments [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfOtherEquityInstrumentsLineItems |
| 3651 |
Initial interest rate |
Concept (Percent) |
For Period |
|
ck0001087711:PercentageOnOtherEquityInterest |
| 3652 |
First call date |
Concept (Year/Month) |
For Period |
|
ck0001087711:OtherEquityInterestMaturityPeriod |
| 3653 |
Other equity instruments |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:OtherEquityInterest |
| 3654 |
1284 - Disclosure - Other Equity Instruments - Additional Information (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureOtherEquityInstrumentsAdditionalInformation |
| 3655 |
Disclosure of other equity instruments [table] |
Table |
* |
* |
ck0001087711:DisclosureOfOtherEquityInstrumentsTable |
| 3656 |
Components of equity [axis] |
Axis |
|
|
ifrs-full:ComponentsOfEquityAxis |
| 3657 |
Equity [member] |
Member |
|
|
ifrs-full:EquityMember |
| 3658 |
300m Step-up Callable Perpetual Reserve Capital Instruments [member] |
Member |
|
|
ck0001087711:ThreeHundredMillionStepupCallablePerpetualReserveCapitalInstrumentsMember |
| 3659 |
500m Fixed Rate Reset Perpetual AT1 Capital Securities [member] |
Member |
|
|
ck0001087711:FiveHundredMillionFixedRateResetPerpetualATOneCapitalSecuritiesMember |
| 3660 |
6.475 % Perpetual Capital Securities [member] |
Member |
|
|
ck0001087711:SixPointFourSevenFivePercentagePerpetualCapitalSecuritiesMember |
| 3661 |
Disclosure of other equity instruments [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfOtherEquityInstrumentsLineItems |
| 3662 |
Reserve Capital Instruments bear interest rate reset period |
Concept (xbrli:durationItemType) |
For Period |
|
ck0001087711:StepUpCallablePerpetualReserveCapitalInstrumentsBearInterestRateResetPeriod |
| 3663 |
Reserve Capital Instruments benchmark gilt rate period |
Concept (xbrli:durationItemType) |
For Period |
|
ck0001087711:StepUpCallablePerpetualReserveCapitalInstrumentsBearInterestRateGiltRateBenchmarkPeriod |
| 3664 |
Common equity tier 1 capital ratio minimum |
Concept (Percent) |
For Period |
|
ck0001087711:CommonEquityTierOneCapitalRatioMinimum |
| 3665 |
Distribution rate resets, period |
Concept (xbrli:durationItemType) |
For Period |
|
ck0001087711:DistributionRateResetsBasedOnPrevailingFiveYearSterlingMidSwapRatePeriod |
| 3666 |
Capital securities purchased and redeemed |
Concept (Percent) |
For Period |
|
ck0001087711:PercentageOfCapitalSecuritiesPurchasedAndRedeemed |
| 3667 |
1285 - Disclosure - Other Equity Instruments - Summary of Other Equity Instruments (Parenthetical) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureOtherEquityInstrumentsSummaryOfOtherEquityInstrumentsParenthetical |
| 3668 |
Disclosure of other equity instruments [table] |
Table |
* |
* |
ck0001087711:DisclosureOfOtherEquityInstrumentsTable |
| 3669 |
Components of equity [axis] |
Axis |
|
|
ifrs-full:ComponentsOfEquityAxis |
| 3670 |
Equity [member] |
Member |
|
|
ifrs-full:EquityMember |
| 3671 |
300m Step-up Callable Perpetual Reserve Capital Instruments [member] |
Member |
|
|
ck0001087711:ThreeHundredMillionStepupCallablePerpetualReserveCapitalInstrumentsMember |
| 3672 |
500m Perpetual Capital Securities [member] |
Member |
|
|
ck0001087711:FiveHundredMillionPerpetualCapitalSecuritiesTwoThousandTwentyFourMember |
| 3673 |
750m Perpetual Capital Securities [member] |
Member |
|
|
ck0001087711:SevenHundredAndFiftyMillionPerpetualCapitalSecuritiesMember |
| 3674 |
300m Perpetual Capital Securities [member] |
Member |
|
|
ck0001087711:ThreeHundredMillionPerpetualCapitalSecuritiesMember |
| 3675 |
500m Perpetual Capital Securities [member] |
Member |
|
|
ck0001087711:FiveHundredMillionPerpetualCapitalSecuritiesMember |
| 3676 |
Disclosure of other equity instruments [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfOtherEquityInstrumentsLineItems |
| 3677 |
Capital securities |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:CapitalSecuritiesIssued |
| 3678 |
1286 - Disclosure - Non-Controlling Interests - Schedule of Amounts Attributable to Non-Controlling Interests (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureNonControllingInterestsScheduleOfAmountsAttributableToNonControllingInterests |
| 3679 |
Disclosure of Non-controlling Interests [table] |
Table |
* |
* |
ck0001087711:DisclosureOfNoncontrollingInterestsTable |
| 3680 |
Components of equity [axis] |
Axis |
|
|
ifrs-full:ComponentsOfEquityAxis |
| 3681 |
Equity [member] |
Member |
|
|
ifrs-full:EquityMember |
| 3682 |
PSA Finance UK Limited [member] |
Member |
|
|
ck0001087711:PSAFinanceUKLimitedMember |
| 3683 |
Disclosure of noncontrolling interests [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfNoncontrollingInterestsLineItems |
| 3684 |
Non-controlling interests |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:NoncontrollingInterests |
| 3685 |
1287 - Disclosure - Changes in Liabilities Arising From Financing Activities - Summary of Changes in Liabilities Arising from Financing Activities (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureChangesInLiabilitiesArisingFromFinancingActivitiesSummaryOfChangesInLiabilitiesArisingFromFinancingActivities |
| 3686 |
Disclosure of reconciliation of liabilities arising from financing activities [table] |
Table |
* |
* |
ifrs-full:DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesTable |
| 3687 |
Classes of financial instruments [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialInstrumentsAxis |
| 3688 |
Financial instruments, class [member] |
Member |
|
|
ifrs-full:ClassesOfFinancialInstrumentsMember |
| 3689 |
Debt Securities [member] |
Member |
|
|
ck0001087711:DebtSecuritiesInIssueMember |
| 3690 |
Subordinated liabilities [member] |
Member |
|
|
ck0001087711:SubordinatedLiabilitiesMember |
| 3691 |
Other Equity Instruments [member] |
Member |
|
|
ifrs-full:OtherEquityInterestMember |
| 3692 |
Dividends Paid [member] |
Member |
|
|
ck0001087711:DividendsPaidMember |
| 3693 |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesLineItems |
| 3694 |
Beginning Balance |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:LiabilitiesArisingFromFinancingActivities |
| 3695 |
Cash flows from financing activities |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:CashFlowsFromUsedInFinancingActivities |
| 3696 |
Cash flows from operating activities |
Concept (Monetary) |
For Period |
|
ck0001087711:CashFlowsFromUsedInOperatingActivitiesArisingFromChangeInLiabilitiesOfFinancing |
| 3697 |
- Unrealised foreign exchange |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:IncreaseDecreaseThroughEffectOfChangesInForeignExchangeRatesLiabilitiesArisingFromFinancingActivities |
| 3698 |
- Other changes |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:IncreaseDecreaseThroughOtherChangesLiabilitiesArisingFromFinancingActivities |
| 3699 |
Ending Balance |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:LiabilitiesArisingFromFinancingActivities |
| 3700 |
1288 - Disclosure - Assets Charged as Security for Liabilities and Collateral Accepted as Security for Assets - Financial Assets Charged as Security Under On-Balance Sheet and Off-Balance (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureAssetsChargedAsSecurityForLiabilitiesAndCollateralAcceptedAsSecurityForAssetsFinancialAssetsChargedAsSecurityUnderOnBalanceSheetAndOffBalance |
| 3701 |
Disclosure of assets pledged as security [table] |
Table |
* |
* |
ck0001087711:DisclosureOfAssetsPledgedAsSecurityTable |
| 3702 |
Assets and liabilities [axis] |
Axis |
|
|
ifrs-full:AssetsAndLiabilitiesAxis |
| 3703 |
Assets and liabilities [member] |
Member |
|
|
ifrs-full:AssetsAndLiabilitiesMember |
| 3704 |
On-Balance Sheet [member] |
Member |
|
|
ck0001087711:OnBalanceSheetMember |
| 3705 |
Off-Balance Sheet [member] |
Member |
|
|
ck0001087711:OffBalanceSheetMember |
| 3706 |
Classes of financial assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialAssetsAxis |
| 3707 |
Financial assets, class [member] |
Member |
|
|
ifrs-full:FinancialAssetsMember |
| 3708 |
Cash and Balances at Central Banks [member] |
Member |
|
|
ck0001087711:CashAndBalancesWithCentralBanksMember |
| 3709 |
Trading Assets [member] |
Member |
|
|
ck0001087711:TradingAssetsMember |
| 3710 |
Loans and Advances to Customers [member] |
Member |
|
|
ck0001087711:LoansAndAdvancesToCustomersMember |
| 3711 |
Loans and advances to banks [member] |
Member |
|
|
ck0001087711:LoansAndAdvancesToBanksMember |
| 3712 |
Other financial assets at amortised cost [member] |
Member |
|
|
ck0001087711:OtherFinancialAssetsAtAmortisedCostMember |
| 3713 |
Financial assets at fair value through other comprehensive income [member] |
Member |
|
|
ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember |
| 3714 |
Financial investments [member] |
Member |
|
|
ck0001087711:FinancialInvestmentsMember |
| 3715 |
Classes of financial instruments [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialInstrumentsAxis |
| 3716 |
Financial instruments, class [member] |
Member |
|
|
ifrs-full:ClassesOfFinancialInstrumentsMember |
| 3717 |
Securitisations and Covered Bonds [member] |
Member |
|
|
ck0001087711:SecuritisationsAndCoveredBondsMember |
| 3718 |
Other [member] |
Member |
|
|
ck0001087711:OtherMember |
| 3719 |
Disclosure of assets pledged as security [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfAssetsPledgedAsSecurityLineItems |
| 3720 |
Assets charged as security for liabilities |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssetsPledgedAsCollateralForLiabilitiesOrContingentLiabilities |
| 3721 |
1289 - Disclosure - Assets Charged as Security for Liabilities and Collateral Accepted as Security for Assets - Additional Information (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureAssetsChargedAsSecurityForLiabilitiesAndCollateralAcceptedAsSecurityForAssetsAdditionalInformation |
| 3722 |
Disclosure of assets pledged as security [table] |
Table |
* |
* |
ck0001087711:DisclosureOfAssetsPledgedAsSecurityTable |
| 3723 |
Subsidiaries [axis] |
Axis |
|
|
ifrs-full:SignificantInvestmentsInSubsidiariesAxis |
| 3724 |
Entity's total for subsidiaries [member] |
Member |
|
|
ifrs-full:EntitysTotalForSubsidiariesMember |
| 3725 |
Fellow Subsidiaries [member] |
Member |
|
|
ifrs-full:SubsidiariesMember |
| 3726 |
Santander UK Plc [member] |
Member |
|
|
ck0001087711:SantanderUkPlcMember |
| 3727 |
Classes of financial assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialAssetsAxis |
| 3728 |
Financial assets, class [member] |
Member |
|
|
ifrs-full:FinancialAssetsMember |
| 3729 |
Sale and Repurchase Agreements [member] |
Member |
|
|
ck0001087711:SaleAndRepurchaseAgreementsMember |
| 3730 |
Loans and advances to customers- securitisations and covered bonds [member] |
Member |
|
|
ck0001087711:LoansAndAdvancesToCustomersSecuritisationsAndCoveredBondsMember |
| 3731 |
Internally Retained [member] |
Member |
|
|
ck0001087711:InternallyRetainedMember |
| 3732 |
Third Party Bilateral Secured Funding Transactions [member] |
Member |
|
|
ck0001087711:ThirdPartyBilateralSecuredFundingTransactionsMember |
| 3733 |
Cash [member] |
Member |
|
|
ck0001087711:Cash1Member |
| 3734 |
Purchase and resale agreements [member] |
Member |
|
|
ck0001087711:PurchaseAndResaleAgreementsMember |
| 3735 |
Continuing involvement in derecognised financial assets by type of transfer [axis] |
Axis |
|
|
ifrs-full:ContinuingInvolvementInDerecognisedFinancialAssetsByTypeOfTransferAxis |
| 3736 |
Types of transfer [member] |
Member |
|
|
ifrs-full:TypesOfTransferMember |
| 3737 |
Securitisations and Covered Bonds [member] |
Member |
|
|
ck0001087711:SecuritisationsAndCoveredBondsMember |
| 3738 |
Securities Lending [member] |
Member |
|
|
ifrs-full:SecuritiesLendingMember |
| 3739 |
Classes of financial instruments [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialInstrumentsAxis |
| 3740 |
Financial instruments, class [member] |
Member |
|
|
ifrs-full:ClassesOfFinancialInstrumentsMember |
| 3741 |
Derivative Financial Instruments [member] |
Member |
|
|
ifrs-full:DerivativesMember |
| 3742 |
Disclosure of assets pledged as security [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfAssetsPledgedAsSecurityLineItems |
| 3743 |
Assets charged as security for liabilities |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssetsPledgedAsCollateralForLiabilitiesOrContingentLiabilities |
| 3744 |
Gross assets charged as security for liabilities |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:AssetsRecognisedInEntitysFinancialStatementsInRelationToStructuredEntities |
| 3745 |
Internally retained securitisation and covered bond issuances available for creating collateral |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:NoteIssuancesAvailableForCreatingCollateral |
| 3746 |
Notes issued under securitisation and covered bond programmes retained internally |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:NotesAndDebenturesIssued |
| 3747 |
Assets charged as security for liabilities |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:AssetsPledgedAsCollateralForLiabilities |
| 3748 |
Collateral accepted as security for assets |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:CollateralAcceptedAsSecurityForAssets |
| 3749 |
1290 - Disclosure - Assets Charged as Security for Liabilities and Collateral Accepted as Security for Assets - Schedule of Collateral Held as Security for Assets (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureAssetsChargedAsSecurityForLiabilitiesAndCollateralAcceptedAsSecurityForAssetsScheduleOfCollateralHeldAsSecurityForAssets |
| 3750 |
Disclosure of assets pledged as security [table] |
Table |
* |
* |
ck0001087711:DisclosureOfAssetsPledgedAsSecurityTable |
| 3751 |
Assets and liabilities [axis] |
Axis |
|
|
ifrs-full:AssetsAndLiabilitiesAxis |
| 3752 |
Assets and liabilities [member] |
Member |
|
|
ifrs-full:AssetsAndLiabilitiesMember |
| 3753 |
On-Balance Sheet [member] |
Member |
|
|
ck0001087711:OnBalanceSheetMember |
| 3754 |
Off-Balance Sheet [member] |
Member |
|
|
ck0001087711:OffBalanceSheetMember |
| 3755 |
Classes of financial liabilities [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialLiabilitiesAxis |
| 3756 |
Total [Member] |
Member |
|
|
ifrs-full:FinancialLiabilitiesMember |
| 3757 |
Trading Liabilities [member] |
Member |
|
|
ck0001087711:TradingLiabilities1Member |
| 3758 |
Deposits by customers [member] |
Member |
|
|
ck0001087711:DepositsByCustomersMember |
| 3759 |
Deposits by banks [member] |
Member |
|
|
ck0001087711:DepositsByBanksMember |
| 3760 |
Disclosure of assets pledged as security [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfAssetsPledgedAsSecurityLineItems |
| 3761 |
Total on-balance sheet/ off-balance sheet |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:CollateralAcceptedAsSecurityForAssets |
| 3762 |
1291 - Disclosure - Share-Based Compensation - Additional Information (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureShareBasedCompensationAdditionalInformation |
| 3763 |
Disclosure of terms and conditions of share-based payment arrangement [table] |
Table |
* |
* |
ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable |
| 3764 |
Range [axis] |
Axis |
|
|
ifrs-full:RangeAxis |
| 3765 |
Ranges [member] |
Member |
|
|
ifrs-full:RangesMember |
| 3766 |
Bottom of Range [member] |
Member |
|
|
ifrs-full:BottomOfRangeMember |
| 3767 |
Top of Range [member] |
Member |
|
|
ifrs-full:TopOfRangeMember |
| 3768 |
Variable Pay of Less Than 500,000 [member] |
Member |
|
|
ck0001087711:VariablePayOfLessThan500000Member |
| 3769 |
Variable Pay at or Above 500,000 [member] |
Member |
|
|
ck0001087711:VariablePayAtOrAbove500000Member |
| 3770 |
Types of share-based payment arrangements [axis] |
Axis |
|
|
ifrs-full:TypesOfSharebasedPaymentArrangementsAxis |
| 3771 |
Share-based payment arrangements [member] |
Member |
|
|
ifrs-full:SharebasedPaymentArrangementsMember |
| 3772 |
Long-Term Incentive Plan (LTIP) [member] |
Member |
|
|
ck0001087711:LongtermIncentivePlanMember |
| 3773 |
Share Incentive Plans [member] |
Member |
|
|
ck0001087711:ShareIncentivePlansMember |
| 3774 |
Regulatory deferral account balances [axis] |
Axis |
|
|
ifrs-full:RegulatoryDeferralAccountBalancesAxis |
| 3775 |
Regulatory deferral account balances [member] |
Member |
|
|
ifrs-full:RegulatoryDeferralAccountBalancesMember |
| 3776 |
Cash [member] |
Member |
|
|
ck0001087711:Cash1Member |
| 3777 |
Shares [member] |
Member |
|
|
ck0001087711:SharesMember |
| 3778 |
Title of individual 1 [axis] |
Axis |
|
|
ck0001087711:TitleOfIndividual1Axis |
| 3779 |
Government Grants [domain] |
Member |
|
|
ck0001087711:GovernmentGrantsDomain |
| 3780 |
Employees [member] |
Member |
|
|
ck0001087711:MaterialRiskTakersMember |
| 3781 |
Disclosure of terms and conditions of share-based payment arrangement [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems |
| 3782 |
Liabilities arising from share-based payment transactions |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:LiabilitiesFromSharebasedPaymentTransactions2011 |
| 3783 |
Liabilities arising from share-based payment transactions, vested liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:IntrinsicValueOfLiabilitiesFromSharebasedPaymentTransactionsForWhichCounterpartysRightToCashOrOtherAssetsVested2011 |
| 3784 |
Number of sharesave schemes launched |
Concept (Integer) |
For Period |
|
ck0001087711:NumberOfSharesaveScehmesLaunched |
| 3785 |
Year of grant of share-based payment arrangement |
Concept (Text/String) |
For Period |
|
ifrs-full:DateOfGrantOfSharebasedPaymentArrangement |
| 3786 |
Employee saving on share based compensation |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:EstimatedEmployeeSavingOnShareBasedCompensationPlan |
| 3787 |
Terms of options |
Concept (xbrli:durationItemType) |
For Period |
|
ck0001087711:MaximumTermOfOptionsGrantedForShareBasedPaymentsArrangement |
| 3788 |
Discount percent on share price under share based compensation plan |
Concept (Percent) |
For Period |
|
ck0001087711:EstimatedDiscountPercentOnSharePriceUnderShareBasedCompensationPlan |
| 3789 |
Weighted average share price |
Concept (Monetary) |
For Period |
|
ifrs-full:WeightedAverageExercisePriceOfShareOptionsInSharebasedPaymentArrangementExercisedDuringPeriodAtDateOfExercise |
| 3790 |
Weighted average grant-date fair value |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:WeightedAverageFairValueAtMeasurementDateShareOptionsGranted |
| 3791 |
LTIP awarded |
Concept (Decimal) |
For Period |
|
ifrs-full:NumberOfInstrumentsOtherEquityInstrumentsGranted |
| 3792 |
Percent of other equity instruments vested |
Concept (Percent) |
For Period |
|
ck0001087711:PercentOfOtherEquityInstrumentsVestedInSharebasedPaymentArrangement |
| 3793 |
Annual bonus percentage |
Concept (Percent) |
For Period |
|
ck0001087711:AnnualBonusPercentage |
| 3794 |
Deferred shares description |
Concept (Text/String) |
For Period |
|
ck0001087711:DeferredShareAwardsDescription |
| 3795 |
Percentage of defer annual bonus |
Concept (Percent) |
For Period |
|
ck0001087711:PercentageOfDeferAnnualBonus |
| 3796 |
Maximum investment value per tax year |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:MaximumNetInvestmentValue |
| 3797 |
Percentage of maximum salary that can be invested |
Concept (Percent) |
For Period |
|
ck0001087711:PercentageOfMaximumSalaryThatCanBeInvested |
| 3798 |
Vesting requirements for sharebased payment arrangement |
Concept (Text/String) |
For Period |
|
ifrs-full:DescriptionOfVestingRequirementsForSharebasedPaymentArrangement |
| 3799 |
Number of shares outstanding |
Concept (Shares) |
For Period |
|
ifrs-full:IncreaseDecreaseInNumberOfSharesOutstanding |
| 3800 |
1292 - Disclosure - Share-Based Compensation - Summary of Movement in Share Options (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureShareBasedCompensationSummaryOfMovementInShareOptions |
| 3801 |
Disclosure of terms and conditions of share-based payment arrangement [table] |
Table |
* |
* |
ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable |
| 3802 |
Types of share-based payment arrangements [axis] |
Axis |
|
|
ifrs-full:TypesOfSharebasedPaymentArrangementsAxis |
| 3803 |
Share-based payment arrangements [member] |
Member |
|
|
ifrs-full:SharebasedPaymentArrangementsMember |
| 3804 |
Sharesave Schemes [member] |
Member |
|
|
ck0001087711:SharesaveSchemesMember |
| 3805 |
Disclosure of terms and conditions of share-based payment arrangement [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems |
| 3806 |
Number of options outstanding beginning balance |
Concept (Decimal) |
As Of |
|
ifrs-full:NumberOfOutstandingShareOptions |
| 3807 |
Number of options granted |
Concept (Decimal) |
For Period |
|
ifrs-full:NumberOfShareOptionsGrantedInSharebasedPaymentArrangement |
| 3808 |
Number of options exercised |
Concept (Decimal) |
For Period |
|
ifrs-full:NumberOfShareOptionsExercisedInSharebasedPaymentArrangement |
| 3809 |
Number of options forfeited/expired |
Concept (Decimal) |
For Period |
|
ck0001087711:NumberOfShareOptionsForfeitedOrExpiredInSharebasedPaymentArrangement |
| 3810 |
Number of options transferred to SEIL |
Concept (Decimal) |
For Period |
|
ck0001087711:NumberOfShareOptionsTransferredToSEIL |
| 3811 |
Number of options outstanding ending balance |
Concept (Decimal) |
As Of |
|
ifrs-full:NumberOfOutstandingShareOptions |
| 3812 |
Number of options exercisable |
Concept (Decimal) |
As Of |
|
ifrs-full:NumberOfShareOptionsExercisableInSharebasedPaymentArrangement |
| 3813 |
Weighted average exercise price outstanding beginning balance |
Concept (Monetary) |
As Of |
|
ifrs-full:WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement |
| 3814 |
Weighted average exercise price granted |
Concept (Monetary) |
For Period |
|
ifrs-full:WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement |
| 3815 |
Weighted average exercise price exercised |
Concept (Monetary) |
For Period |
|
ifrs-full:WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement |
| 3816 |
Weighted average exercise price forfeited/expired |
Concept (Monetary) |
For Period |
|
ck0001087711:WeightedAverageExercisePriceOfShareOptionsForfeitedOrExpiredInSharebasedPaymentArrangement |
| 3817 |
Weighted average exercise price transferred to SEIL |
Concept (Monetary) |
For Period |
|
ck0001087711:WeightedAverageExercisePriceOfShareOptionsTransferredToSEILInSharebasedPaymentArrangement |
| 3818 |
Weighted average exercise price outstanding ending balance |
Concept (Monetary) |
As Of |
|
ifrs-full:WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement |
| 3819 |
Weighted average exercise price exercisable ending balance |
Concept (Monetary) |
As Of |
|
ifrs-full:WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement |
| 3820 |
1293 - Disclosure - Share-Based Compensation - Summary of Range of Exercise Prices and Weighted Average Remaining Contractual Life of the Options Outstanding (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureShareBasedCompensationSummaryOfRangeOfExercisePricesAndWeightedAverageRemainingContractualLifeOfTheOptionsOutstanding |
| 3821 |
Disclosure of number and weighted average remaining contractual life of outstanding share options [table] |
Table |
* |
* |
ifrs-full:DisclosureOfNumberAndWeightedAverageRemainingContractualLifeOfOutstandingShareOptionsTable |
| 3822 |
Types of share-based payment arrangements [axis] |
Axis |
|
|
ifrs-full:TypesOfSharebasedPaymentArrangementsAxis |
| 3823 |
Share-based payment arrangements [member] |
Member |
|
|
ifrs-full:SharebasedPaymentArrangementsMember |
| 3824 |
Sharesave Schemes [member] |
Member |
|
|
ck0001087711:SharesaveSchemesMember |
| 3825 |
Ranges of exercise prices for outstanding share options [axis] |
Axis |
|
|
ifrs-full:RangesOfExercisePricesForOutstandingShareOptionsAxis |
| 3826 |
Ranges of exercise prices for outstanding share options [member] |
Member |
|
|
ifrs-full:RangesOfExercisePricesForOutstandingShareOptionsMember |
| 3827 |
2 to 3 [member] |
Member |
|
|
ck0001087711:PoundTwoToPoundThreeMember |
| 3828 |
3 to 4 [member] |
Member |
|
|
ck0001087711:PoundThreeToPoundFourMember |
| 3829 |
4 to 5 [member] |
Member |
|
|
ck0001087711:PoundFourToPoundFiveMember |
| 3830 |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfNumberAndWeightedAverageRemainingContractualLifeOfOutstandingShareOptionsLineItems |
| 3831 |
Options outstanding , Weighted average remaining contractual life years |
Concept (xbrli:durationItemType) |
For Period |
|
ck0001087711:WeightedAveragesRemainingContractualLifeOfOutstandingShareOptions |
| 3832 |
Option outstanding, Weighted average exercise price |
Concept (Monetary) |
As Of |
|
ifrs-full:WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement |
| 3833 |
1294 - Disclosure - Share-Based Compensation - Summary of Range of Exercise Prices and Weighted Average Remaining Contractual Life of the Options Outstanding (Parenthetical) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureShareBasedCompensationSummaryOfRangeOfExercisePricesAndWeightedAverageRemainingContractualLifeOfTheOptionsOutstandingParenthetical |
| 3834 |
Disclosure of number and weighted average remaining contractual life of outstanding share options [table] |
Table |
* |
* |
ifrs-full:DisclosureOfNumberAndWeightedAverageRemainingContractualLifeOfOutstandingShareOptionsTable |
| 3835 |
Ranges of exercise prices for outstanding share options [axis] |
Axis |
|
|
ifrs-full:RangesOfExercisePricesForOutstandingShareOptionsAxis |
| 3836 |
Ranges of exercise prices for outstanding share options [member] |
Member |
|
|
ifrs-full:RangesOfExercisePricesForOutstandingShareOptionsMember |
| 3837 |
2 to 3 [member] |
Member |
|
|
ck0001087711:PoundTwoToPoundThreeMember |
| 3838 |
3 to 4 [member] |
Member |
|
|
ck0001087711:PoundThreeToPoundFourMember |
| 3839 |
4 to 5 [member] |
Member |
|
|
ck0001087711:PoundFourToPoundFiveMember |
| 3840 |
Range [axis] |
Axis |
|
|
ifrs-full:RangeAxis |
| 3841 |
Ranges [member] |
Member |
|
|
ifrs-full:RangesMember |
| 3842 |
Bottom of Range [member] |
Member |
|
|
ifrs-full:BottomOfRangeMember |
| 3843 |
Top of Range [member] |
Member |
|
|
ifrs-full:TopOfRangeMember |
| 3844 |
Types of share-based payment arrangements [axis] |
Axis |
|
|
ifrs-full:TypesOfSharebasedPaymentArrangementsAxis |
| 3845 |
Share-based payment arrangements [member] |
Member |
|
|
ifrs-full:SharebasedPaymentArrangementsMember |
| 3846 |
Sharesave Schemes [member] |
Member |
|
|
ck0001087711:SharesaveSchemesMember |
| 3847 |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfNumberAndWeightedAverageRemainingContractualLifeOfOutstandingShareOptionsLineItems |
| 3848 |
Range of exercise prices |
Concept (Monetary) |
As Of |
|
ifrs-full:ExercisePriceOfOutstandingShareOptions |
| 3849 |
1295 - Disclosure - Share-Based Compensation - Summary of Movement in Value of Conditional Awards in LTIPs (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureShareBasedCompensationSummaryOfMovementInValueOfConditionalAwardsInLTIPs |
| 3850 |
Disclosure of terms and conditions of share-based payment arrangement [table] |
Table |
* |
* |
ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable |
| 3851 |
Types of share-based payment arrangements [axis] |
Axis |
|
|
ifrs-full:TypesOfSharebasedPaymentArrangementsAxis |
| 3852 |
Share-based payment arrangements [member] |
Member |
|
|
ifrs-full:SharebasedPaymentArrangementsMember |
| 3853 |
2015 LTIP [member] |
Member |
|
|
ck0001087711:TwoThousandAndFifteenLongTermIncentivePlanMember |
| 3854 |
2014 LTIP [member] |
Member |
|
|
ck0001087711:TwoThousandAndFourteenLongTermIncentivePlanMember |
| 3855 |
Disclosure of terms and conditions of share-based payment arrangement [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems |
| 3856 |
Conditional awards at the beginning of the year |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:ConditionalAwards |
| 3857 |
Conditional awards forfeited or cancelled |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:ConditionalAwardsForfeitedOrCancelled |
| 3858 |
Conditional awards outstanding at the end of the year |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:ConditionalAwards |
| 3859 |
1296 - Disclosure - Transactions With Directors and Other Key Management Personnel - Summary of Remuneration of the Directors and Other Key Management Personnel (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureTransactionsWithDirectorsAndOtherKeyManagementPersonnelSummaryOfRemunerationOfTheDirectorsAndOtherKeyManagementPersonnel |
| 3860 |
Implied Table |
Table |
* |
* |
implied:Table |
| 3861 |
Disclosure Of Remuneration Of Directors And Other Key Management Personnel [abstract] |
Abstract |
|
|
ck0001087711:DisclosureOfRemunerationOfDirectorsAndOtherKeyManagementPersonnelAbstract |
| 3862 |
Salaries and fees |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:DirectorsSalariesAndFees |
| 3863 |
Performance-related payments |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:DirectorsPerformanceRelatedPayments |
| 3864 |
Other fixed remuneration (pension and other allowances & non-cash benefits) |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:DirectorsExpenses |
| 3865 |
Expenses |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:DirectorsRemunerationExpense |
| 3866 |
Total remuneration |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:DirectorsRemuneration |
| 3867 |
Short-term employee benefits |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:KeyManagementPersonnelCompensationShorttermEmployeeBenefits |
| 3868 |
Post-employment benefits |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:KeyManagementPersonnelCompensationPostemploymentBenefits |
| 3869 |
Total compensation |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:KeyManagementPersonnelCompensation |
| 3870 |
1297 - Disclosure - Transactions With Directors and Other Key Management Personnel - Summary of Remuneration of the Directors and Other Key Management Personnel (Parenthetical) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureTransactionsWithDirectorsAndOtherKeyManagementPersonnelSummaryOfRemunerationOfTheDirectorsAndOtherKeyManagementPersonnelParenthetical |
| 3871 |
Disclosure Of Directors And Key Management Remuneration [table] |
Table |
* |
* |
ck0001087711:DisclosureOfDirectorsAndKeyManagementRemunerationTable |
| 3872 |
Subsidiaries [axis] |
Axis |
|
|
ifrs-full:SignificantInvestmentsInSubsidiariesAxis |
| 3873 |
Entity's total for subsidiaries [member] |
Member |
|
|
ifrs-full:EntitysTotalForSubsidiariesMember |
| 3874 |
Banco Santander SA London Branch [member] |
Member |
|
|
ck0001087711:BancoSantanderSALondonBranchMember |
| 3875 |
Disclosure of directors and key management remuneration [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfDirectorsAndKeyManagementRemunerationLineItems |
| 3876 |
Number of shares made as buy-outs of deferred performance-related payment |
Concept (Shares) |
For Period |
|
ck0001087711:DeferredPerformanceRelatedNumberOfShares |
| 3877 |
Payments made as buy-outs of deferred performance-related payment |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:DeferredPerformanceRelatedPayments |
| 3878 |
Number of previously employed individuals for buy-out of deferred performance related payment |
Concept (Integer) |
For Period |
|
ck0001087711:NumberOfPreviouslyEmployedIndividualsForBuyoutsOfDeferredPerformanceRelatedPayments |
| 3879 |
Termination payment |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:TerminationBenefitsExpense |
| 3880 |
Number key management persons who receives termination benefit |
Concept (Integer) |
For Period |
|
ck0001087711:NumberOfKeyManagementPersonnelWhoReceiveTerminationBenefit |
| 3881 |
1298 - Disclosure - Transactions With Directors and Other Key Management Personnel - Additional Information (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureTransactionsWithDirectorsAndOtherKeyManagementPersonnelAdditionalInformation |
| 3882 |
Disclosure Of Directors And Key Management Remuneration [table] |
Table |
* |
* |
ck0001087711:DisclosureOfDirectorsAndKeyManagementRemunerationTable |
| 3883 |
Categories of related parties [axis] |
Axis |
|
|
ifrs-full:CategoriesOfRelatedPartiesAxis |
| 3884 |
Entity's total for related parties [member] |
Member |
|
|
ifrs-full:EntitysTotalForRelatedPartiesMember |
| 3885 |
Banco Santander SA [member] |
Member |
|
|
ck0001087711:BancoSantanderSAMember |
| 3886 |
Other key management personnel [member] |
Member |
|
|
ck0001087711:OtherKeyManagementPersonnelMember |
| 3887 |
Disclosure of transactions between related parties [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems |
| 3888 |
Remuneration excluding pension contribution |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:DirectorsRemunerationExpenseHighestPaidDirector |
| 3889 |
Remuneration excluding pension contribution performance related |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:RemunerationExcludingPensionContributionPerformanceRelatedHighestPaidDirector |
| 3890 |
Deferred pension benefit accruing under a defined benefit scheme |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:DeferredPensionBenefitAccruingUnderDefinedBenefitScheme |
| 3891 |
Ex gratia pensions paid to former Directors |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:ExgratiaPensionsPaid |
| 3892 |
Directors who held any interest in the shares |
Concept (Integer) |
For Period |
|
ck0001087711:NumberOfDirectorsWhoHeldInterestInShares |
| 3893 |
Directors who exercised or were granted any rights to subscribe for shares |
Concept (Integer) |
For Period |
|
ck0001087711:NumberOfDirectorsWhoExercisedOrWereGrantedAnyRightsToSubscribeForShares |
| 3894 |
Loans made to directors |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:DirectorsLoansPrincipalAmountOutstanding |
| 3895 |
Number of loan made to directors |
Concept (Integer) |
For Period |
|
ck0001087711:NumberOfLoansMadeToDirectors |
| 3896 |
Benefits paid in kind for directors |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:DirectorsRemunerationExpense |
| 3897 |
Number of directors paid in kind |
Concept (Integer) |
For Period |
|
ck0001087711:NumberOfDirectors |
| 3898 |
Benefits paid in kind for key management |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:KeyManagementPersonnelCompensation |
| 3899 |
Number of key management paid in kind |
Concept (Integer) |
For Period |
|
ck0001087711:NumberOfKeyManagementPersonnel |
| 3900 |
Loans made to key management personnel |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:CashAdvancesAndLoansMadeToRelatedParties |
| 3901 |
Number of loan made to key management personnel |
Concept (Integer) |
For Period |
|
ck0001087711:NumberOfLoansMadeToKeyManagementPersonnel |
| 3902 |
1299 - Disclosure - Transactions With Directors and Other Key Management Personnel - Summary of Transactions with Directors, Other Key Management Personnel (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureTransactionsWithDirectorsAndOtherKeyManagementPersonnelSummaryOfTransactionsWithDirectorsOtherKeyManagementPersonnel |
| 3903 |
Disclosure Of Directors And Key Management Remuneration [table] |
Table |
* |
* |
ck0001087711:DisclosureOfDirectorsAndKeyManagementRemunerationTable |
| 3904 |
Categories of related parties [axis] |
Axis |
|
|
ifrs-full:CategoriesOfRelatedPartiesAxis |
| 3905 |
Entity's total for related parties [member] |
Member |
|
|
ifrs-full:EntitysTotalForRelatedPartiesMember |
| 3906 |
Key management personnel of entity or parent [member] |
Member |
|
|
ifrs-full:KeyManagementPersonnelOfEntityOrParentMember |
| 3907 |
Disclosure of directors and key management remuneration [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfDirectorsAndKeyManagementRemunerationLineItems |
| 3908 |
Number of secured loans, unsecured loans and overdrafts, beginning balance |
Concept (Integer) |
As Of |
|
ck0001087711:NumberOfSecuredLoansUnsecuredLoansAndOverdrafts |
| 3909 |
Number of secured loans, unsecured loans and overdrafts, net movements |
Concept (Integer) |
For Period |
|
ck0001087711:NumberOfSecuredLoansUnsecuredLoansAndOverdraftsNetMovement |
| 3910 |
Number of secured loans, unsecured loans and overdrafts, ending balance |
Concept (Integer) |
As Of |
|
ck0001087711:NumberOfSecuredLoansUnsecuredLoansAndOverdrafts |
| 3911 |
Beginning balance |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:SecuredLoansUnsecuredLoansAndOverdrafts |
| 3912 |
Net movements |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:SecuredLoansUnsecuredLoansAndOverdraftsNetMovements |
| 3913 |
Ending balance |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:SecuredLoansUnsecuredLoansAndOverdrafts |
| 3914 |
Number of deposit, bank and instant access accounts and investments, beginning balance |
Concept (Integer) |
As Of |
|
ck0001087711:NumberOfDepositBankAndInstantAccessAccountsAndInvestments |
| 3915 |
Number of deposit, bank and instant access accounts and investments, net movements |
Concept (Integer) |
For Period |
|
ck0001087711:NumberOfDepositBankAndInstantAccessAccountsAndInvestmentsNetMovement |
| 3916 |
Number of deposit, bank and instant access accounts and investments, ending balance |
Concept (Integer) |
As Of |
|
ck0001087711:NumberOfDepositBankAndInstantAccessAccountsAndInvestments |
| 3917 |
Beginning balance |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:DepositBankAndInstantAccessAccountsAndInvestments |
| 3918 |
Net movements |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:DepositBankAndInstantAccessAccountsAndInvestmentsNetMovement |
| 3919 |
Ending balance |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:DepositBankAndInstantAccessAccountsAndInvestments |
| 3920 |
1300 - Disclosure - Related Party Disclosures - Summary of Transactions With Related Parties (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureRelatedPartyDisclosuresSummaryOfTransactionsWithRelatedParties |
| 3921 |
Disclosure of transactions between related parties [table] |
Table |
* |
* |
ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesTable |
| 3922 |
Categories of related parties [axis] |
Axis |
|
|
ifrs-full:CategoriesOfRelatedPartiesAxis |
| 3923 |
Entity's total for related parties [member] |
Member |
|
|
ifrs-full:EntitysTotalForRelatedPartiesMember |
| 3924 |
Ultimate Parent [Member] |
Member |
|
|
ck0001087711:UltimateParentMember |
| 3925 |
Immediate Parent [member] |
Member |
|
|
ck0001087711:ImmediateParentMember |
| 3926 |
Fellow Subsidiaries [member] |
Member |
|
|
ifrs-full:SubsidiariesMember |
| 3927 |
Associates and Joint Ventures [Member] |
Member |
|
|
ck0001087711:AssociatesAndJointVenturesMember |
| 3928 |
Disclosure of transactions between related parties [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems |
| 3929 |
Interest, fees and other income received |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:InterestFeesAndOtherIncomeReceived |
| 3930 |
Interest, fees and other expenses paid |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:InterestFeesAndOtherExpensePaid |
| 3931 |
Amounts owed by related parties |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:AmountsReceivableRelatedPartyTransactions |
| 3932 |
Amounts owed to related parties |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:AmountsPayableRelatedPartyTransactions |
| 3933 |
1301 - Disclosure - Related Party Disclosures - Additional Information (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureRelatedPartyDisclosuresAdditionalInformation |
| 3934 |
Disclosure of transactions between related parties [table] |
Table |
* |
* |
ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesTable |
| 3935 |
Categories of related parties [axis] |
Axis |
|
|
ifrs-full:CategoriesOfRelatedPartiesAxis |
| 3936 |
Entity's total for related parties [member] |
Member |
|
|
ifrs-full:EntitysTotalForRelatedPartiesMember |
| 3937 |
Banco Santander London Branch [member] |
Member |
|
|
ck0001087711:BancoSantanderLondonBranchMember |
| 3938 |
Santander UK Group Holdings plc [member] |
Member |
|
|
ck0001087711:SantanderUkGroupHoldingsPlcMember |
| 3939 |
Classes of financial instruments [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialInstrumentsAxis |
| 3940 |
Financial instruments, class [member] |
Member |
|
|
ifrs-full:ClassesOfFinancialInstrumentsMember |
| 3941 |
Derivative Financial Instruments [member] |
Member |
|
|
ifrs-full:DerivativesMember |
| 3942 |
Disclosure of transactions between related parties [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems |
| 3943 |
Customer loans |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:ConsumerLoans |
| 3944 |
Other assets |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:OtherAssets |
| 3945 |
Liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:Liabilities |
| 3946 |
Decrease in RWAs due to transfers |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:DecreaseInRiskweightedAssetsDueToModelChanges |
| 3947 |
Dividend paid |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:DividendsPaid |
| 3948 |
Percentage of sale of share capital in subsidiaries |
Concept (Percent) |
For Period |
|
ck0001087711:SaleOfShareCapitalIssuedPercentage |
| 3949 |
Cash consideration |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:ConsiderationPaidReceived |
| 3950 |
1302 - Disclosure - Financial Instruments - Analysis of Fair Value of Financial Instruments Carried at Amortised (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureFinancialInstrumentsAnalysisOfFairValueOfFinancialInstrumentsCarriedAtAmortised |
| 3951 |
Disclosure Of Fair Values Of Financial Instruments Carried At Amortised Cost [table] |
Table |
* |
* |
ck0001087711:DisclosureOfFairValuesOfFinancialInstrumentsCarriedAtAmortisedCostTable |
| 3952 |
Levels of fair value hierarchy [axis] |
Axis |
|
|
ifrs-full:LevelsOfFairValueHierarchyAxis |
| 3953 |
All levels of fair value hierarchy [member] |
Member |
|
|
ifrs-full:AllLevelsOfFairValueHierarchyMember |
| 3954 |
Level 1 [member] |
Member |
|
|
ifrs-full:Level1OfFairValueHierarchyMember |
| 3955 |
Level 2 [member] |
Member |
|
|
ifrs-full:Level2OfFairValueHierarchyMember |
| 3956 |
Level 3 [member] |
Member |
|
|
ifrs-full:Level3OfFairValueHierarchyMember |
| 3957 |
Fair Value [member] |
Member |
|
|
ifrs-full:AtFairValueMember |
| 3958 |
Categories of financial assets [axis] |
Axis |
|
|
ifrs-full:CategoriesOfFinancialAssetsAxis |
| 3959 |
Financial assets, category [member] |
Member |
|
|
ifrs-full:FinancialAssetsCategoryMember |
| 3960 |
Loans and Advances to Customers [member] |
Member |
|
|
ck0001087711:LoansAndAdvancesToCustomersMember |
| 3961 |
Loans and advances to banks [member] |
Member |
|
|
ck0001087711:LoansAndAdvancesToBanksMember |
| 3962 |
Reverse repurchase agreements - non-trading [member] |
Member |
|
|
ck0001087711:ReverseRepurchaseAgreementsNontradingMember |
| 3963 |
Financial investments [member] |
Member |
|
|
ck0001087711:FinancialInvestmentsMember |
| 3964 |
Categories of financial liabilities [axis] |
Axis |
|
|
ifrs-full:CategoriesOfFinancialLiabilitiesAxis |
| 3965 |
Financial liabilities, category [member] |
Member |
|
|
ifrs-full:FinancialLiabilitiesCategoryMember |
| 3966 |
Deposits by customers [member] |
Member |
|
|
ck0001087711:DepositsByCustomersMember |
| 3967 |
Deposits by banks [member] |
Member |
|
|
ck0001087711:DepositsByBanksMember |
| 3968 |
Repurchase agreements - non trading [member] |
Member |
|
|
ck0001087711:RepurchaseAgreementsNontradingMember |
| 3969 |
Debt Securities [member] |
Member |
|
|
ck0001087711:DebtSecuritiesInIssueMember |
| 3970 |
Subordinated liabilities [member] |
Member |
|
|
ck0001087711:SubordinatedLiabilitiesMember |
| 3971 |
Classes of financial liabilities [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialLiabilitiesAxis |
| 3972 |
Total [Member] |
Member |
|
|
ifrs-full:FinancialLiabilitiesMember |
| 3973 |
Financial Liabilities at Amortised Cost, Category [member] |
Member |
|
|
ifrs-full:FinancialLiabilitiesAtAmortisedCostCategoryMember |
| 3974 |
Classes of financial assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialAssetsAxis |
| 3975 |
Financial assets, class [member] |
Member |
|
|
ifrs-full:FinancialAssetsMember |
| 3976 |
Financial assets at amortised cost [member] |
Member |
|
|
ifrs-full:FinancialAssetsAtAmortisedCostMember |
| 3977 |
Disclosure Of Fair Values Of Financial Instruments Carried At Amortised Cost [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfFairValuesOfFinancialInstrumentsCarriedAtAmortisedCostLineItems |
| 3978 |
Deposits by customers |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:DepositsFromCustomers |
| 3979 |
Deposits by banks |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:DepositsFromBanks |
| 3980 |
Repurchase agreements - non trading |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:RepurchaseAgreementsAndCashCollateralOnSecuritiesLent |
| 3981 |
Debt securities in issue |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:DebtSecurities |
| 3982 |
Financial investments |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:SubordinatedLiabilities |
| 3983 |
Financial liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:FinancialLiabilities |
| 3984 |
Loans and advances to customers |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:LoansAndAdvancesToCustomers |
| 3985 |
Loans and advances to banks |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:LoansAndAdvancesToBanks |
| 3986 |
Reverse repurchase agreements - non trading |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:ReverseRepurchaseAgreementsAndCashCollateralOnSecuritiesBorrowed |
| 3987 |
Other financial assets at amortised cost |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:OtherFinancialAssetsAtAmortisedCost |
| 3988 |
Financial investments |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:FinancialInvestments |
| 3989 |
Financial assets |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssets |
| 3990 |
1303 - Disclosure - Financial Instruments - Fair Values of Financial Instruments Measured at Fair Value on a Recurring Basis (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureFinancialInstrumentsFairValuesOfFinancialInstrumentsMeasuredAtFairValueOnARecurringBasis |
| 3991 |
Disclosure of fair value measurement of assets [table] |
Table |
* |
* |
ifrs-full:DisclosureOfFairValueMeasurementOfAssetsTable |
| 3992 |
Classes of financial instruments [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialInstrumentsAxis |
| 3993 |
Financial instruments, class [member] |
Member |
|
|
ifrs-full:ClassesOfFinancialInstrumentsMember |
| 3994 |
Securities Purchased Under Resale Agreements [member] |
Member |
|
|
ck0001087711:SecuritiesPurchasedUnderResaleAgreementsMember |
| 3995 |
Debt Securities [member] |
Member |
|
|
ifrs-full:DebtSecuritiesMember |
| 3996 |
Equity securities [member] |
Member |
|
|
ifrs-full:TradingEquitySecuritiesMember |
| 3997 |
Cash Collateral [member] |
Member |
|
|
ck0001087711:CashCollateralMember |
| 3998 |
Short-term loans [member] |
Member |
|
|
ck0001087711:ShortTermLoansMember |
| 3999 |
Exchange Rate Contracts [member] |
Member |
|
|
ck0001087711:ExchangeRateContractsMember |
| 4000 |
Interest Rate Contracts [member] |
Member |
|
|
ifrs-full:InterestRateSwapContractMember |
| 4001 |
Equity and Credit Contracts [member] |
Member |
|
|
ck0001087711:EquityAndCreditContractsMember |
| 4002 |
Netting [member] |
Member |
|
|
ck0001087711:NettingContractsMember |
| 4003 |
Loans and Advances to Customers [member] |
Member |
|
|
ck0001087711:LoansAndAdvancesToCustomersMember |
| 4004 |
Equity Securities [member] |
Member |
|
|
ifrs-full:OtherEquitySecuritiesMember |
| 4005 |
Reverse repurchase agreements - non-trading [member] |
Member |
|
|
ck0001087711:ReverseRepurchaseAgreementsNontradingMember |
| 4006 |
Available for sale debt securities [member] |
Member |
|
|
ck0001087711:AvailableForSaleDebtSecuritiesMember |
| 4007 |
Available for sale equity securities [member] |
Member |
|
|
ck0001087711:AvailableForSaleEquitySecuritiesMember |
| 4008 |
Securities Sold Under Repurchase Agreements [member] |
Member |
|
|
ck0001087711:SecuritiesSoldUnderRepurchaseAgreementsMember |
| 4009 |
Short Positions in Securities and Unsettled Trades [member] |
Member |
|
|
ck0001087711:ShortPositionsInSecuritiesAndUnsettledTradesMember |
| 4010 |
Short-term Deposits [member] |
Member |
|
|
ck0001087711:ShortTermDepositsMember |
| 4011 |
Debt Securities [member] |
Member |
|
|
ck0001087711:DebtSecuritiesInIssueMember |
| 4012 |
Structured Deposits [member] |
Member |
|
|
ck0001087711:StructuredDepositsMember |
| 4013 |
Collateral and associated financial guarantees [member] |
Member |
|
|
ck0001087711:CollateralsAndGuaranteesMember |
| 4014 |
Levels of fair value hierarchy [axis] |
Axis |
|
|
ifrs-full:LevelsOfFairValueHierarchyAxis |
| 4015 |
All levels of fair value hierarchy [member] |
Member |
|
|
ifrs-full:AllLevelsOfFairValueHierarchyMember |
| 4016 |
Level 1 [member] |
Member |
|
|
ifrs-full:Level1OfFairValueHierarchyMember |
| 4017 |
Level 2 [member] |
Member |
|
|
ifrs-full:Level2OfFairValueHierarchyMember |
| 4018 |
Level 3 [member] |
Member |
|
|
ifrs-full:Level3OfFairValueHierarchyMember |
| 4019 |
Categories of financial assets [axis] |
Axis |
|
|
ifrs-full:CategoriesOfFinancialAssetsAxis |
| 4020 |
Financial assets, category [member] |
Member |
|
|
ifrs-full:FinancialAssetsCategoryMember |
| 4021 |
Trading Assets [member] |
Member |
|
|
ck0001087711:TradingAssetsMember |
| 4022 |
Derivative Financial Instruments [member] |
Member |
|
|
ck0001087711:DerivativeFinancialInstrumentsMember |
| 4023 |
Other Financial assets at fair value through profit or loss, category [member] |
Member |
|
|
ck0001087711:OtherFinancialAssetsAtFairValueThroughProfitOrLossCategoryMember |
| 4024 |
Financial assets at fair value through other comprehensive income [member] |
Member |
|
|
ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember |
| 4025 |
Financial investments [member] |
Member |
|
|
ck0001087711:FinancialInvestmentsMember |
| 4026 |
Categories of financial liabilities [axis] |
Axis |
|
|
ifrs-full:CategoriesOfFinancialLiabilitiesAxis |
| 4027 |
Financial liabilities, category [member] |
Member |
|
|
ifrs-full:FinancialLiabilitiesCategoryMember |
| 4028 |
Trading Liabilities [member] |
Member |
|
|
ck0001087711:TradingLiabilities1Member |
| 4029 |
Derivative Financial Instruments [member] |
Member |
|
|
ck0001087711:DerivativeFinancialInstrumentsMember |
| 4030 |
Other financial liabilities designated at fair value through profit or loss [member] |
Member |
|
|
ck0001087711:OtherFinancialLiabilitiesDesignatedAtFairValueThroughProfitOrLossMember |
| 4031 |
Disclosure of fair value measurement of assets and liabilities [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems |
| 4032 |
Assets at fair value |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssetsAtFairValue |
| 4033 |
Valuation technique |
Concept (Text/String) |
For Period |
|
ck0001087711:FairValuesOfFinancialInstrumentsValuationTechniqueUsed |
| 4034 |
Liabilities at fair value |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:FinancialLiabilitiesAtFairValue |
| 4035 |
1304 - Disclosure - Financial Instruments - Additional Information (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureFinancialInstrumentsAdditionalInformation |
| 4036 |
Implied Table |
Table |
* |
* |
implied:Table |
| 4037 |
Disclosure of financial assets [abstract] |
Abstract |
|
|
ifrs-full:DisclosureOfFinancialAssetsAbstract |
| 4038 |
Fair value of financial instruments transferred from Level 1 to Level 2 |
Concept (Monetary) |
For Period |
|
ifrs-full:TransfersOutOfLevel1IntoLevel2OfFairValueHierarchyAssets |
| 4039 |
Fair value of financial instruments transferred from Level 2 to Level 1 |
Concept (Monetary) |
For Period |
|
ifrs-full:TransfersOutOfLevel2IntoLevel1OfFairValueHierarchyAssets |
| 4040 |
Fair value of financial instruments transferred from Level 2 to Level 3, Derivative assets |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:TransfersIntoLevel3OfFairValueHierarchyAssets |
| 4041 |
Fair value of financial instruments transferred from Level 2 to Level 3, Derivative liabilities |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:TransfersIntoLevel3OfFairValueHierarchyLiabilities |
| 4042 |
Exposure to wrong-way risk |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:ExposureToWrongWayRisk |
| 4043 |
1305 - Disclosure - Financial Instruments - Summary of Fair Value Adjustment (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureFinancialInstrumentsSummaryOfFairValueAdjustment |
| 4044 |
Disclosure of financial assets [table] |
Table |
* |
* |
ifrs-full:DisclosureOfFinancialAssetsTable |
| 4045 |
Fair Value Adjustments [axis] |
Axis |
|
|
ck0001087711:FairValueAdjustmentsAxis |
| 4046 |
Fair Value Adjustments [domain] |
Member |
|
|
ck0001087711:FairValueAdjustmentsDomain |
| 4047 |
Bid-Offer and Trade Specific Adjustments [Member] |
Member |
|
|
ck0001087711:BidOfferAndTradeSpecificRiskRelatedAdjustmentsMember |
| 4048 |
Uncertainty [Member] |
Member |
|
|
ck0001087711:RiskRelatedUncertaintyAdjustmentsMember |
| 4049 |
Credit Risk Adjustment [Member] |
Member |
|
|
ck0001087711:CreditRiskAdjustmentsMember |
| 4050 |
Funding Fair Value Adjustment [Member] |
Member |
|
|
ck0001087711:RiskRelatedFundingFairValueAdjustmentMember |
| 4051 |
Risk Related Adjustments [Member] |
Member |
|
|
ck0001087711:RiskRelatedAdjustmentsMember |
| 4052 |
Model-Related [Member] |
Member |
|
|
ck0001087711:ModelRelatedAdjustmentsMember |
| 4053 |
Day One Profit [Member] |
Member |
|
|
ck0001087711:DayOneProfitAdjustmentsMember |
| 4054 |
Disclosure of financial assets [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfFinancialAssetsLineItems |
| 4055 |
Fair value adjustments |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:FairValueAdjustmentsRisk |
| 4056 |
1306 - Disclosure - Financial Instruments - Analysis of Financial Instruments Valued Using Internal Models Based on Information Other Than Market Data (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureFinancialInstrumentsAnalysisOfFinancialInstrumentsValuedUsingInternalModelsBasedOnInformationOtherThanMarketData |
| 4057 |
Disclosure of financial assets [table] |
Table |
* |
* |
ifrs-full:DisclosureOfFinancialAssetsTable |
| 4058 |
Classes of financial instruments [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialInstrumentsAxis |
| 4059 |
Financial instruments, class [member] |
Member |
|
|
ifrs-full:ClassesOfFinancialInstrumentsMember |
| 4060 |
Reversionary property securities [member] |
Member |
|
|
ck0001087711:ReversionaryPropertyInterestsMember |
| 4061 |
Loans and Advances to Customers [member] |
Member |
|
|
ck0001087711:LoansAndAdvancesToCustomersMember |
| 4062 |
Unlisted Equity Shares [member] |
Member |
|
|
ck0001087711:UnlistedEquitySharesMember |
| 4063 |
Credit Linked Note [member] |
Member |
|
|
ck0001087711:CreditLinkedNoteMember |
| 4064 |
Property Related Options and Forwards [Member] |
Member |
|
|
ck0001087711:PropertyRelatedOptionsAndForwardsMember |
| 4065 |
Credit Protection Guarantees [member] |
Member |
|
|
ck0001087711:CreditProtectionGuaranteesMember |
| 4066 |
Classes of financial assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialAssetsAxis |
| 4067 |
Financial assets, class [member] |
Member |
|
|
ifrs-full:FinancialAssetsMember |
| 4068 |
Equity and Credit Contracts [member] |
Member |
|
|
ck0001087711:EquityAndCreditContractsMember |
| 4069 |
Roll-up Mortgage Portfolio [member] |
Member |
|
|
ck0001087711:RollupMortgagePortfolioMember |
| 4070 |
Debt Securities [member] |
Member |
|
|
ck0001087711:DebtSecuritiesInIssueMember |
| 4071 |
Equity Securities [member] |
Member |
|
|
ifrs-full:OtherEquitySecuritiesMember |
| 4072 |
Other Loans [member] |
Member |
|
|
ck0001087711:OtherLoansMember |
| 4073 |
Financial Guarantees [member] |
Member |
|
|
ck0001087711:FinancialGuaranteesMember |
| 4074 |
Other Level 3 [member] |
Member |
|
|
ck0001087711:OtherLevelThreeMember |
| 4075 |
Levels of fair value hierarchy [axis] |
Axis |
|
|
ifrs-full:LevelsOfFairValueHierarchyAxis |
| 4076 |
All levels of fair value hierarchy [member] |
Member |
|
|
ifrs-full:AllLevelsOfFairValueHierarchyMember |
| 4077 |
Financial assets at fair value through other comprehensive income [member] |
Member |
|
|
ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember |
| 4078 |
Level 3 [member] |
Member |
|
|
ifrs-full:Level3OfFairValueHierarchyMember |
| 4079 |
Disclosure of financial assets [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfFinancialAssetsLineItems |
| 4080 |
Derivative assets |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssets |
| 4081 |
FVTPL |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLoss |
| 4082 |
FVOCI |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncome |
| 4083 |
Derivative liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:FinancialLiabilities |
| 4084 |
FVTPL |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLoss |
| 4085 |
Financial assets and liabilities |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:FinancialAssetsAndLiabilities |
| 4086 |
Other Level 3 assets |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:OtherFinancialAssets |
| 4087 |
Other Level 3 liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:OtherFinancialLiabilities |
| 4088 |
Total net assets |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:NetAssetsLiabilities |
| 4089 |
Financial asset liabilities |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:GainsLossesRecognisedInProfitOrLossFairValueMeasurementAssetsLiabilities |
| 4090 |
Derivative assets and other Level 3 assets, fair value movements recognised in profit/(loss) |
Concept (Monetary) |
For Period |
|
ifrs-full:GainsLossesRecognisedInProfitOrLossFairValueMeasurementAssets |
| 4091 |
Derivative liabilities and other Level 3 liabilities, fair value movements recognised in profit/(loss) |
Concept (Monetary) |
For Period |
|
ifrs-full:GainsLossesRecognisedInProfitOrLossFairValueMeasurementLiabilities |
| 4092 |
Total (expense)/income |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:FairValueMovementRecognisedInProfitLoss |
| 4093 |
1307 - Disclosure - Financial Instruments - Liabilities Reconciliation of Fair Value Measurements in Level 3 of the Fair Value Hierarchy (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureFinancialInstrumentsLiabilitiesReconciliationOfFairValueMeasurementsInLevel3OfTheFairValueHierarchy |
| 4094 |
Disclosure of Financial Liabilities [Table] |
Table |
* |
* |
ifrs-full:DisclosureOfFinancialLiabilitiesTable |
| 4095 |
Levels of fair value hierarchy [axis] |
Axis |
|
|
ifrs-full:LevelsOfFairValueHierarchyAxis |
| 4096 |
All levels of fair value hierarchy [member] |
Member |
|
|
ifrs-full:AllLevelsOfFairValueHierarchyMember |
| 4097 |
Level 3 [member] |
Member |
|
|
ifrs-full:Level3OfFairValueHierarchyMember |
| 4098 |
Classes of liabilities [axis] |
Axis |
|
|
ifrs-full:ClassesOfLiabilitiesAxis |
| 4099 |
Liabilities [member] |
Member |
|
|
ifrs-full:LiabilitiesMember |
| 4100 |
Derivative Liabilities [Member] |
Member |
|
|
ck0001087711:DerivativeLiabilitiesMember |
| 4101 |
Categories of financial liabilities [axis] |
Axis |
|
|
ifrs-full:CategoriesOfFinancialLiabilitiesAxis |
| 4102 |
Financial liabilities, category [member] |
Member |
|
|
ifrs-full:FinancialLiabilitiesCategoryMember |
| 4103 |
Fair Value Through P&L [member] |
Member |
|
|
ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember |
| 4104 |
Financial Liabilities at Fair Value, Class [member] |
Member |
|
|
ifrs-full:FinancialLiabilitiesAtFairValueMember |
| 4105 |
Disclosure of fair value measurement of liabilities [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfFairValueMeasurementOfLiabilitiesLineItems |
| 4106 |
Beginning balance |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:Liabilities |
| 4107 |
Adoption of IFRS 9 |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:IncreaseDecreaseInFinancialLiabilities |
| 4108 |
At 1 January 2018 |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:LiabilitiesAfterAdoptionOfIFRS9 |
| 4109 |
Total (losses)/gains recognised in profit/loss, fair value movements |
Concept (Monetary) |
For Period |
|
ifrs-full:GainsLossesRecognisedInProfitOrLossFairValueMeasurementLiabilities |
| 4110 |
Total (losses)/gains recognised in profit/loss, foreign exchange and other movements |
Concept (Monetary) |
For Period |
|
ck0001087711:GainsLossesRecognisedInProfitOrLossForeignExchangeAndOtherMovementsLiabilities |
| 4111 |
Transfers in |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:TransfersIntoLevel3OfFairValueHierarchyLiabilities |
| 4112 |
Gains recognised in other comprehensive income |
Concept (Monetary) |
For Period |
|
ifrs-full:GainsLossesRecognisedInOtherComprehensiveIncomeFairValueMeasurementLiabilities |
| 4113 |
Additions |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:PurchasesFairValueMeasurementLiabilities |
| 4114 |
Sales |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:SalesFairValueMeasurementLiabilities |
| 4115 |
Settlements |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:SettlementsFairValueMeasurementLiabilities |
| 4116 |
Ending Balance |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:Liabilities |
| 4117 |
(Losses)/gains recognised in profit or loss relating to assets and liabilities held at the end of the year |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:IncreaseDecreaseInFairValueMeasurementLiabilities |
| 4118 |
1308 - Disclosure - Financial Instruments - Assets Reconciliation of Fair Value Measurements in Level 3 of the Fair Value Hierarchy (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureFinancialInstrumentsAssetsReconciliationOfFairValueMeasurementsInLevel3OfTheFairValueHierarchy |
| 4119 |
Disclosure of financial assets [table] |
Table |
* |
* |
ifrs-full:DisclosureOfFinancialAssetsTable |
| 4120 |
Levels of fair value hierarchy [axis] |
Axis |
|
|
ifrs-full:LevelsOfFairValueHierarchyAxis |
| 4121 |
All levels of fair value hierarchy [member] |
Member |
|
|
ifrs-full:AllLevelsOfFairValueHierarchyMember |
| 4122 |
Level 3 [member] |
Member |
|
|
ifrs-full:Level3OfFairValueHierarchyMember |
| 4123 |
Classes of assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfAssetsAxis |
| 4124 |
Assets [member] |
Member |
|
|
ifrs-full:ClassesOfAssetsMember |
| 4125 |
Derivative Financial Instruments [member] |
Member |
|
|
ifrs-full:DerivativesMember |
| 4126 |
Financial investments [member] |
Member |
|
|
ck0001087711:FinancialInvestmentsMember |
| 4127 |
Categories of financial assets [axis] |
Axis |
|
|
ifrs-full:CategoriesOfFinancialAssetsAxis |
| 4128 |
Financial assets, category [member] |
Member |
|
|
ifrs-full:FinancialAssetsCategoryMember |
| 4129 |
Fair Value Through P&L [Member] |
Member |
|
|
ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember |
| 4130 |
Financial assets at FVOCI [member] |
Member |
|
|
ck0001087711:FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeMember |
| 4131 |
Disclosure of financial assets [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfFinancialAssetsLineItems |
| 4132 |
Beginning balance |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:Assets |
| 4133 |
Adoption of IFRS 9 |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:IncreaseDecreaseInFinancialAssets |
| 4134 |
At 1 January 2018 |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:AssetsAfterAdoptionOfIFRS9 |
| 4135 |
Total (losses)/gains recognised in profit/loss, fair value movements |
Concept (Monetary) |
For Period |
|
ifrs-full:GainsLossesRecognisedInProfitOrLossFairValueMeasurementAssets |
| 4136 |
Total (losses)/gains recognised in profit/loss, foreign exchange and other movements |
Concept (Monetary) |
For Period |
|
ck0001087711:GainsLossesRecognisedInProfitOrLossForeignExchangeAndOtherMovementAssets |
| 4137 |
Transfers in |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:TransfersIntoLevel3OfFairValueHierarchyAssets |
| 4138 |
Gains recognised in other comprehensive income |
Concept (Monetary) |
For Period |
|
ifrs-full:GainsLossesRecognisedInOtherComprehensiveIncomeFairValueMeasurementAssets |
| 4139 |
Additions |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:PurchasesFairValueMeasurementAssets |
| 4140 |
Sales |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:SalesFairValueMeasurementAssets |
| 4141 |
Settlements |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:SettlementsFairValueMeasurementAssets |
| 4142 |
Ending Balance |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:Assets |
| 4143 |
(Losses)/gains recognised in profit or loss relating to assets and liabilities held at the end of the year |
Concept (Monetary) |
For Period |
Debit |
ifrs-full:IncreaseDecreaseInFairValueMeasurementAssets |
| 4144 |
1309 - Disclosure - Financial Instruments - Effects of Changes in Significant Unobservable Assumptions to Reasonably Possible Alternatives (Level 3) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureFinancialInstrumentsEffectsOfChangesInSignificantUnobservableAssumptionsToReasonablyPossibleAlternativesLevel3 |
| 4145 |
Effect of changes in significant unobservable assumptions to reasonably possible alternatives - Level 3 [table] |
Table |
* |
* |
ck0001087711:EffectOfChangesInSignificantUnobservableAssumptionsToReasonablyPossibleAlternativesLevel3Table |
| 4146 |
Categories of financial assets [axis] |
Axis |
|
|
ifrs-full:CategoriesOfFinancialAssetsAxis |
| 4147 |
Financial assets, category [member] |
Member |
|
|
ifrs-full:FinancialAssetsCategoryMember |
| 4148 |
Fair Value Through P&L [Member] |
Member |
|
|
ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember |
| 4149 |
Financial assets at fair value through other comprehensive income [member] |
Member |
|
|
ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember |
| 4150 |
Available-for-Sale [member] |
Member |
|
|
ck0001087711:AvailableForSaleMember |
| 4151 |
Range [axis] |
Axis |
|
|
ifrs-full:RangeAxis |
| 4152 |
Ranges [member] |
Member |
|
|
ifrs-full:RangesMember |
| 4153 |
Bottom of Range [member] |
Member |
|
|
ifrs-full:BottomOfRangeMember |
| 4154 |
Top of Range [member] |
Member |
|
|
ifrs-full:TopOfRangeMember |
| 4155 |
Weighted average [member] |
Member |
|
|
ifrs-full:WeightedAverageMember |
| 4156 |
Classes of financial instruments [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialInstrumentsAxis |
| 4157 |
Financial instruments, class [member] |
Member |
|
|
ifrs-full:ClassesOfFinancialInstrumentsMember |
| 4158 |
Equity and Credit Contracts [member] |
Member |
|
|
ck0001087711:EquityAndCreditContractsMember |
| 4159 |
Debt Securities [member] |
Member |
|
|
ck0001087711:DebtSecuritiesInIssueMember |
| 4160 |
Equity Securities [member] |
Member |
|
|
ifrs-full:OtherEquitySecuritiesMember |
| 4161 |
Loans and Advances to Customers [member] |
Member |
|
|
ck0001087711:LoansAndAdvancesToCustomersMember |
| 4162 |
Classes of financial liabilities [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialLiabilitiesAxis |
| 4163 |
Total [Member] |
Member |
|
|
ifrs-full:FinancialLiabilitiesMember |
| 4164 |
Property Related Options and Forwards [Member] |
Member |
|
|
ck0001087711:PropertyRelatedOptionsAndForwardsMember |
| 4165 |
Classes of financial assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialAssetsAxis |
| 4166 |
Financial assets, class [member] |
Member |
|
|
ifrs-full:FinancialAssetsMember |
| 4167 |
Reversionary property securities [member] |
Member |
|
|
ck0001087711:ReversionaryPropertyInterestsMember |
| 4168 |
Roll-up Mortgage Portfolio [member] |
Member |
|
|
ck0001087711:RollupMortgagePortfolioMember |
| 4169 |
Unlisted Equity Shares [member] |
Member |
|
|
ck0001087711:UnlistedEquitySharesMember |
| 4170 |
Other Loans [member] |
Member |
|
|
ck0001087711:OtherLoansMember |
| 4171 |
Effect of changes in significant unobservable assumptions to reasonably possible alternatives - Level 3 [line items] |
LineItems |
|
|
ck0001087711:EffectOfChangesInSignificantUnobservableAssumptionsToReasonablyPossibleAlternativesLevel3LineItems |
| 4172 |
Fair value |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:FinancialLiabilitiesAtFairValue |
| 4173 |
Fair value |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssetsAtFairValue |
| 4174 |
Assumption description |
Concept (Text/String) |
For Period |
|
ifrs-full:ChangesInMethodsAndAssumptionsUsedInPreparingSensitivityAnalysis |
| 4175 |
Assumption value |
Concept (Percent) |
For Period |
|
ck0001087711:InterestRateSignificantUnobservableInputs |
| 4176 |
Shift |
Concept (Percent) |
For Period |
|
ck0001087711:ShiftInFairValueInstrument |
| 4177 |
Favourable changes |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:FavourableChangesInFairValue |
| 4178 |
Unfavourable changes |
Concept (Monetary) |
For Period |
Credit |
ck0001087711:UnfavourableChangesInFairValue |
| 4179 |
HPI spot rate index level |
Concept (Integer) |
For Period |
|
ck0001087711:HousePriceIndexSpotRateIndexLevel |
| 4180 |
1310 - Disclosure - Financial Instruments - Maturities of Undiscounted Cash Flows for Financial Liabilities and Off Balance Sheet Commitments (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureFinancialInstrumentsMaturitiesOfUndiscountedCashFlowsForFinancialLiabilitiesAndOffBalanceSheetCommitments |
| 4181 |
Disclosure Of Maturity Analysis For Financial Liabilities [table] |
Table |
* |
* |
ck0001087711:DisclosureOfMaturityAnalysisForFinancialLiabilitiesTable |
| 4182 |
Classes of financial instruments [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialInstrumentsAxis |
| 4183 |
Financial instruments, class [member] |
Member |
|
|
ifrs-full:ClassesOfFinancialInstrumentsMember |
| 4184 |
Undiscounted Cash Flow [member] |
Member |
|
|
ck0001087711:UndiscountedCashFlowMember |
| 4185 |
Maturity [axis] |
Axis |
|
|
ifrs-full:MaturityAxis |
| 4186 |
Aggregated time bands [member] |
Member |
|
|
ifrs-full:AggregatedTimeBandsMember |
| 4187 |
On Demand [member] |
Member |
|
|
ifrs-full:OnDemandMember |
| 4188 |
Not Later Than Three Months [member] |
Member |
|
|
ifrs-full:NotLaterThanThreeMonthsMember |
| 4189 |
Later Than Three Months and Not Later Than One Year [member] |
Member |
|
|
ifrs-full:LaterThanThreeMonthsAndNotLaterThanOneYearMember |
| 4190 |
Later Than One Year and Not Later Than Five Years [member] |
Member |
|
|
ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember |
| 4191 |
Later Than Five Years [member] |
Member |
|
|
ifrs-full:LaterThanFiveYearsMember |
| 4192 |
Disclosure Of Maturity Analysis For Financial Liabilities [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfMaturityAnalysisForFinancialLiabilitiesLineItems |
| 4193 |
Trading liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossClassifiedAsHeldForTrading |
| 4194 |
Derivative financial instruments |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:DerivativeFinancialLiabilitiesGross |
| 4195 |
Other financial liabilities at fair value through profit or loss |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:OtherFinancialLiabilitiesAtFairValueThroughProfitOrLoss |
| 4196 |
Deposits by customers |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:DepositsFromCustomers |
| 4197 |
Deposits by banks |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:DepositsFromBanks |
| 4198 |
Repurchase agreements - non trading |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:RepurchaseAgreementsAndCashCollateralOnSecuritiesLent |
| 4199 |
Debt securities in issue |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:DebtSecurities |
| 4200 |
Subordinated liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:SubordinatedLiabilities |
| 4201 |
Financial liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:FinancialLiabilities |
| 4202 |
Off-balance sheet commitments given |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:OffBalanceSheetCommitments |
| 4203 |
1311 - Disclosure - Offsetting Financial Assets and Liabilities - Summary of Information about Impact of Offsetting of Financial Assets and Liabilities (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureOffsettingFinancialAssetsAndLiabilitiesSummaryOfInformationAboutImpactOfOffsettingOfFinancialAssetsAndLiabilities |
| 4204 |
Disclosure Of Off Setting Of Financial Assets And Liabilities [table] |
Table |
* |
* |
ck0001087711:DisclosureOfOffSettingOfFinancialAssetsAndLiabilitiesTable |
| 4205 |
Classes of financial instruments [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialInstrumentsAxis |
| 4206 |
Financial instruments, class [member] |
Member |
|
|
ifrs-full:ClassesOfFinancialInstrumentsMember |
| 4207 |
Derivative Financial Liabilities [member] |
Member |
|
|
ck0001087711:DerivativeFinancialLiabilitiesMember |
| 4208 |
Amortised cost [member] |
Member |
|
|
ck0001087711:AmortisedCostMember |
| 4209 |
Fair Value [member] |
Member |
|
|
ifrs-full:AtFairValueMember |
| 4210 |
Deposits by Customers and Banks [Member] |
Member |
|
|
ck0001087711:DepositsByCustomersAndBanksMember |
| 4211 |
Derivative Financial Instruments [member] |
Member |
|
|
ck0001087711:DerivativeFinancialAssetsMember |
| 4212 |
Loans and Advances to Customers [member] |
Member |
|
|
ck0001087711:LoansAndAdvancesToCustomersMember |
| 4213 |
Disclosure of offsetting of financial assets and liabilities [line items] |
LineItems |
|
|
ck0001087711:DisclosureOfOffSettingOfFinancialAssetsAndLiabilitiesLineItems |
| 4214 |
Gross amounts, Assets |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:GrossFinancialAssetsSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreements |
| 4215 |
Amounts offset, Assets |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:GrossFinancialLiabilitiesSetOffAgainstFinancialAssetsSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreements |
| 4216 |
Net amounts reported on the balance sheet, Assets |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:NetFinancialAssetsSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreementsInStatementOfFinancialPosition |
| 4217 |
Financial instruments, Assets |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:FinancialInstrumentsSubjectToEnforceableMasterNettingArrangementOrSimilarAgreementNotSetOffAgainstFinancialAssets |
| 4218 |
Financial collateral, Assets |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:CashCollateralReceivedSubjectToEnforceableMasterNettingArrangementOrSimilarAgreementNotSetOffAgainstFinancialAssets |
| 4219 |
Net amount, Assets |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:AmountsSubjectToEnforceableMasterNettingArrangementOrSimilarAgreementNotSetOffAgainstFinancialAssets |
| 4220 |
Assets not subject to enforceable netting arrangements, Assets |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:AssetsNotSubjectToEnforceableMasterNettingArrangementOrSimilarAgreementNotSetOffAgainstFinancialLiabilities |
| 4221 |
Balance sheet total, Assets |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:NetFinancialAssetsSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreements |
| 4222 |
Gross amounts, Liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:GrossFinancialLiabilitiesSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreements |
| 4223 |
Amounts offset, Liabilities |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:GrossFinancialAssetsSetOffAgainstFinancialLiabilitiesSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreements |
| 4224 |
Net amounts reported on the balance sheet, Liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:NetFinancialLiabilitiesSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreementsInStatementOfFinancialPosition |
| 4225 |
Financial instruments, Liabilities |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialInstrumentsSubjectToEnforceableMasterNettingArrangementOrSimilarAgreementNotSetOffAgainstFinancialLiabilities |
| 4226 |
Financial collateral, Liabilities |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:CashCollateralPledgedSubjectToEnforceableMasterNettingArrangementOrSimilarAgreementNotSetOffAgainstFinancialLiabilities |
| 4227 |
Net amount, Liabilities |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:AmountsSubjectToEnforceableMasterNettingArrangementOrSimilarAgreementNotSetOffAgainstFinancialLiabilities |
| 4228 |
Assets not subject to enforceable netting arrangements, Liabilities |
Concept (Monetary) |
As Of |
Credit |
ck0001087711:LiabilitiesNotSubjectToEnforceableMasterNettingArrangementOrSimilarAgreementNotSetOffAgainstFinancialLiabilities |
| 4229 |
Balance sheet total, Liabilities |
Concept (Monetary) |
As Of |
Credit |
ifrs-full:NetFinancialLiabilitiesSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreements |
| 4230 |
1312 - Disclosure - Ring-Fencing - Additional Information (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureRingFencingAdditionalInformation |
| 4231 |
Implied Table |
Table |
* |
* |
implied:Table |
| 4232 |
Disclosure of cost and expenses by nature [abstract] |
Abstract |
|
|
ck0001087711:DisclosureOfCostAndExpensesByNatureAbstract |
| 4233 |
Total cost incurred in relation to compliance with ring-rencing legislation |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:CostOfRingfencing |
| 4234 |
1313 - Disclosure - Transition to IFRS 9 - Summary of Measurement Categories and Carrying Amounts of Financial Assets Determined in Accordance with IAS 39 and IFRS 9 (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureTransitionToIFRS9SummaryOfMeasurementCategoriesAndCarryingAmountsOfFinancialAssetsDeterminedInAccordanceWithIAS39AndIFRS9 |
| 4235 |
Transition to IFRS 9 [table] |
Table |
* |
* |
ck0001087711:TransitionToIFRS9Table |
| 4236 |
Initially applied IFRSs [axis] |
Axis |
|
|
ifrs-full:InitiallyAppliedIFRSsAxis |
| 4237 |
Initially applied IFRSs [member] |
Member |
|
|
ifrs-full:InitiallyAppliedIFRSsMember |
| 4238 |
IFRS 9 [member] |
Member |
|
|
ck0001087711:IFRS9Member |
| 4239 |
IAS 39 [member] |
Member |
|
|
ck0001087711:InternationalAccountingStandardsThirtyNineMember |
| 4240 |
Classes of assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfAssetsAxis |
| 4241 |
Assets [member] |
Member |
|
|
ifrs-full:ClassesOfAssetsMember |
| 4242 |
Cash and Balances at Central Banks [member] |
Member |
|
|
ck0001087711:CashAndBalancesWithCentralBanksMember |
| 4243 |
Trading Assets [member] |
Member |
|
|
ck0001087711:TradingAssetsMember |
| 4244 |
Derivative Financial Instruments [member] |
Member |
|
|
ck0001087711:DerivativeFinancialAssetsMember |
| 4245 |
Financial assets designated at fair value [member] |
Member |
|
|
ck0001087711:FinancialAssetsDesignatedAtFairValueMember |
| 4246 |
Loans and Advances to Customers [member] |
Member |
|
|
ck0001087711:LoansAndAdvancesToCustomersMember |
| 4247 |
Loans and advances to banks [member] |
Member |
|
|
ck0001087711:LoansAndAdvancesToBanksMember |
| 4248 |
Reverse repurchase agreements - non-trading [member] |
Member |
|
|
ck0001087711:ReverseRepurchaseAgreementsNontradingMember |
| 4249 |
Financial investments [member] |
Member |
|
|
ck0001087711:FinancialInvestmentsMember |
| 4250 |
Other Assets [member] |
Member |
|
|
ifrs-full:OtherAssetsMember |
| 4251 |
Other financial assets designated at fair value through profit or loss [member] |
Member |
|
|
ck0001087711:OtherFinancialAssetsDesignatedAtFairValueThroughProfitOrLossMember |
| 4252 |
Measurement [axis] |
Axis |
|
|
ifrs-full:MeasurementAxis |
| 4253 |
Aggregated measurement [member] |
Member |
|
|
ifrs-full:AggregatedMeasurementMember |
| 4254 |
FVOCI [member] |
Member |
|
|
ck0001087711:FVOCIMember |
| 4255 |
FVTPL [member] |
Member |
|
|
ck0001087711:FVTPLMember |
| 4256 |
Amortised cost [member] |
Member |
|
|
ck0001087711:AmortisedCostMember |
| 4257 |
FVTPL (Mandatory) [member] |
Member |
|
|
ck0001087711:FVTPLMandatoryMember |
| 4258 |
FVTPL (Designated) [member] |
Member |
|
|
ck0001087711:FVTPLDesignatedMember |
| 4259 |
Other financial assets at amortised cost [member] |
Member |
|
|
ck0001087711:OtherFinancialAssetsAtAmortisedCostMember |
| 4260 |
Financial assets at FVOCI [member] |
Member |
|
|
ck0001087711:FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeMember |
| 4261 |
FVTPL (Mandatory)1 [member] |
Member |
|
|
ck0001087711:FVTPLMandatory1Member |
| 4262 |
Amortised cost1 [member] |
Member |
|
|
ck0001087711:AmortisedCost1Member |
| 4263 |
FVTPL (Mandatory)2 [member] |
Member |
|
|
ck0001087711:FVTPLMandatory2Member |
| 4264 |
Loans and receivable securities [member] |
Member |
|
|
ck0001087711:LoansAndReceivablesMember |
| 4265 |
FVTPL (Trading) [member] |
Member |
|
|
ck0001087711:FVTPLTradingMember |
| 4266 |
FVTPL1 (Designated) [member] |
Member |
|
|
ck0001087711:FVTPLDesignated1Member |
| 4267 |
FVTPL2 (Designated) [member] |
Member |
|
|
ck0001087711:FVTPLDesignated2Member |
| 4268 |
Loans and receivable securities1 [member] |
Member |
|
|
ck0001087711:LoansAndReceivables1Member |
| 4269 |
Loans and receivable securities2 [member] |
Member |
|
|
ck0001087711:LoansAndReceivables2Member |
| 4270 |
Available for sale financial assets [member] |
Member |
|
|
ck0001087711:AvailableForSaleFinancialAssetsMember |
| 4271 |
Available for sale financial assets1 [member] |
Member |
|
|
ck0001087711:AvailableForSaleFinancialAssets1Member |
| 4272 |
Held to maturity investments [member] |
Member |
|
|
ck0001087711:HeldToMaturityInvestmentsMember |
| 4273 |
Available for sale financial assets2 [member] |
Member |
|
|
ck0001087711:AvailableForSaleFinancialAssets2Member |
| 4274 |
Transition to IFRS 9 [line items] |
LineItems |
|
|
ck0001087711:TransitionToIFRS9LineItems |
| 4275 |
Re-classifications |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:IncreaseDecreaseInFinancialAssetsArisingFromChangeInMeasurementAttributeFirstApplicationOfIFRS9 |
| 4276 |
Re-measurement |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:AdjustmentForAdoptionOfIFRS9AllowanceAccountForCreditLossesOfFinancialAssets |
| 4277 |
Ending balance before re-presentation |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:AssetsBeforeRepresentation |
| 4278 |
Re-presentation |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssetsCarryingAmountImmediatelyAfterInitialApplicationOfIFRS9 |
| 4279 |
Beginning balance |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:Assets |
| 4280 |
1314 - Disclosure - Transition to IFRS 9 - Summary of Measurement Categories and Carrying Amounts of Financial Assets Determined in Accordance with IAS 39 and IFRS 9 (Parenthetical) (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureTransitionToIFRS9SummaryOfMeasurementCategoriesAndCarryingAmountsOfFinancialAssetsDeterminedInAccordanceWithIAS39AndIFRS9Parenthetical |
| 4281 |
Transition to IFRS 9 [table] |
Table |
* |
* |
ck0001087711:TransitionToIFRS9Table |
| 4282 |
Categories of financial assets [axis] |
Axis |
|
|
ifrs-full:CategoriesOfFinancialAssetsAxis |
| 4283 |
Financial assets, category [member] |
Member |
|
|
ifrs-full:FinancialAssetsCategoryMember |
| 4284 |
Provisions for off-balance sheet exposures (IAS 37/IFRS 9) [member] |
Member |
|
|
ck0001087711:ProvisionsForOffbalanceSheetExposuresMember |
| 4285 |
Classes of financial instruments [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialInstrumentsAxis |
| 4286 |
Financial instruments, class [member] |
Member |
|
|
ifrs-full:ClassesOfFinancialInstrumentsMember |
| 4287 |
Financial guarantee contracts [member] |
Member |
|
|
ifrs-full:FinancialGuaranteeContractsMember |
| 4288 |
Classes of assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfAssetsAxis |
| 4289 |
Assets [member] |
Member |
|
|
ifrs-full:ClassesOfAssetsMember |
| 4290 |
Loans and Advances to Customers [member] |
Member |
|
|
ck0001087711:LoansAndAdvancesToCustomersMember |
| 4291 |
Financial investments [member] |
Member |
|
|
ck0001087711:FinancialInvestmentsMember |
| 4292 |
Legal entity [axis] |
Axis |
|
|
dei:LegalEntityAxis |
| 4293 |
Entity [Domain] |
Member |
|
|
dei:EntityDomain |
| 4294 |
Santander UK Group [member] |
Member |
|
|
ck0001087711:SantanderUKGroupMember |
| 4295 |
Measurement [axis] |
Axis |
|
|
ifrs-full:MeasurementAxis |
| 4296 |
Aggregated measurement [member] |
Member |
|
|
ifrs-full:AggregatedMeasurementMember |
| 4297 |
FVOCI [member] |
Member |
|
|
ck0001087711:FVOCIMember |
| 4298 |
FVTPL [member] |
Member |
|
|
ck0001087711:FVTPLMember |
| 4299 |
Amortised cost [member] |
Member |
|
|
ck0001087711:AmortisedCostMember |
| 4300 |
Available-for-Sale [member] |
Member |
|
|
ck0001087711:AvailableForSaleMember |
| 4301 |
Initially applied IFRSs [axis] |
Axis |
|
|
ifrs-full:InitiallyAppliedIFRSsAxis |
| 4302 |
Initially applied IFRSs [member] |
Member |
|
|
ifrs-full:InitiallyAppliedIFRSsMember |
| 4303 |
IFRS 9 [member] |
Member |
|
|
ck0001087711:IFRS9Member |
| 4304 |
Temporary difference, unused tax losses and unused tax credits [axis] |
Axis |
|
|
ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis |
| 4305 |
Temporary difference, unused tax losses and unused tax credits [member] |
Member |
|
|
ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember |
| 4306 |
Allowance for credit losses [member] |
Member |
|
|
ifrs-full:AllowanceForCreditLossesMember |
| 4307 |
Reclassifications [member] |
Member |
|
|
ck0001087711:ReclassificationsMember |
| 4308 |
Remeasurements [member] |
Member |
|
|
ck0001087711:RemeasurementsMember |
| 4309 |
Transition to IFRS 9 [line items] |
LineItems |
|
|
ck0001087711:TransitionToIFRS9LineItems |
| 4310 |
Re-measurement |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:AdjustmentForAdoptionOfIFRS9AllowanceAccountForCreditLossesOfFinancialAssets |
| 4311 |
Increase in deferred tax asset |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:IncreaseDecreaseInDeferredTaxLiabilityAsset |
| 4312 |
Financial assets at FVOCI |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncome |
| 4313 |
Trading assets |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:TradingAssets |
| 4314 |
Financial assets at FVTPL |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLoss |
| 4315 |
Downward remeasurement of loans and receivables |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:DownwardRemeasurementOfLoansAndReceivables |
| 4316 |
Downward remeasurement of financial asset |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:DownwardRemeasurementOfFinancialAssets |
| 4317 |
Loans and advances to customers |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:LoansAndAdvancesToCustomers |
| 4318 |
Other financial assets at FVTPL |
Concept (Monetary) |
As Of |
Debit |
ifrs-full:OtherFinancialAssets |
| 4319 |
Financial investments |
Concept (Monetary) |
As Of |
Debit |
ck0001087711:FinancialInvestments |
| 4320 |
1315 - Disclosure - Transition to IFRS 9 - Disclosure of Statutory Balance Sheet Reconciliation under IAS 39 and IFRS 9 (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureTransitionToIFRS9DisclosureOfStatutoryBalanceSheetReconciliationUnderIAS39AndIFRS9 |
| 4321 |
Disclosure of financial assets [table] |
Table |
* |
* |
ifrs-full:DisclosureOfFinancialAssetsTable |
| 4322 |
Initially applied IFRSs [axis] |
Axis |
|
|
ifrs-full:InitiallyAppliedIFRSsAxis |
| 4323 |
Initially applied IFRSs [member] |
Member |
|
|
ifrs-full:InitiallyAppliedIFRSsMember |
| 4324 |
IFRS 9 [member] |
Member |
|
|
ck0001087711:IFRS9Member |
| 4325 |
Classes of financial assets [axis] |
Axis |
|
|
ifrs-full:ClassesOfFinancialAssetsAxis |
| 4326 |
Financial assets, class [member] |
Member |
|
|
ifrs-full:FinancialAssetsMember |
| 4327 |
Financial Assets at Amortised Cost, Category [member] |
Member |
|
|
ifrs-full:FinancialAssetsAtAmortisedCostCategoryMember |
| 4328 |
Disclosure of financial assets [line items] |
LineItems |
|
|
ifrs-full:DisclosureOfFinancialAssetsLineItems |
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To amortised cost from FVPTL |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:GainLossArisingFromDerecognitionOfFinancialAssetsMeasuredAtAmortisedCost |
| 4330 |
Fair value gain that would have been recognised during the year if the financial asset had not been reclassified |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:FairValueGainsOrLossThatWouldHaveBeenRecognisedInProfitOrLossIfFinancialAssetsHadNotBeenReclassified |
| 4331 |
1316 - Disclosure - Transition to IFRS 9 - Additional Information (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureTransitionToIFRS9AdditionalInformation |
| 4332 |
Transition to IFRS 9 [table] |
Table |
* |
* |
ck0001087711:TransitionToIFRS9Table |
| 4333 |
Initially applied IFRSs [axis] |
Axis |
|
|
ifrs-full:InitiallyAppliedIFRSsAxis |
| 4334 |
Initially applied IFRSs [member] |
Member |
|
|
ifrs-full:InitiallyAppliedIFRSsMember |
| 4335 |
IFRS 9 [member] |
Member |
|
|
ck0001087711:IFRS9Member |
| 4336 |
Transition to IFRS 9 [line items] |
LineItems |
|
|
ck0001087711:TransitionToIFRS9LineItems |
| 4337 |
Effective interest rate |
Concept (Percent) |
As Of |
|
ifrs-full:EffectiveInterestRateOfFinancialAssetsReclassifiedOutOfFinancialAssetsAtFairValueThroughProfitOrLoss |
| 4338 |
Interest income recognized |
Concept (Monetary) |
For Period |
Credit |
ifrs-full:InterestIncomeExpenseRecognisedForFinancialAssetsReclassifiedIntoMeasuredAtAmortisedCostFirstApplicationOfIFRS9 |
| 4339 |
1317 - Disclosure - Events After the Balance Sheet Date - Additional Information (Detail) |
Network |
* |
* |
http://imetrix.edgar-online.com/taxonomy/role/DisclosureEventsAfterTheBalanceSheetDateAdditionalInformation |
| 4340 |
Implied Table |
Table |
* |
* |
implied:Table |
| 4341 |
Disclosure of non-adjusting events after reporting period [abstract] |
Abstract |
|
|
ifrs-full:DisclosureOfNonadjustingEventsAfterReportingPeriodAbstract |
| 4342 |
Description of nature of Non adjusting event after reporting period |
Concept (Text/String) |
For Period |
|
ifrs-full:DescriptionOfNatureOfNonadjustingEventAfterReportingPeriod |
| 4343 |
Estimated investment to refurbish 100 branches |
Concept (Monetary) |
For Period |
Debit |
ck0001087711:EstimatedInvestmentToRefurbishBranchNetwork |
| 4344 |
Number of branches being closed |
Concept (Integer) |
For Period |
|
ck0001087711:NumberOfBranchesBeingClosed |
| 4345 |
Number of branches in our future branch network |
Concept (Integer) |
For Period |
|
ck0001087711:NumberOfBranchesInOurFutureBranchNetwork |