ING GROEP NV (SEC Filing Page | XBRL Cloud Viewer | XBRL Instance)

Line Label Object Class Period Type Balance Report ElementName
1 001001 - Document - Document and Entity Information Network

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 http://www.ing.com/taxonomy/role/DocumentandEntityInformation
2 Implied Table Table

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 implied:Table
3 Document - Document and Entity Information [Abstract] Abstract ing: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 Common Stock, Shares Outstanding Concept (Shares) As Of dei:EntityCommonStockSharesOutstanding
17 Entity Emerging Growth Company Concept (Yes/No) For Period dei:EntityEmergingGrowthCompany
18 Entity Shell Company Concept (Yes/No) For Period dei:EntityShellCompany
19 Entity Small Business Concept (Yes/No) For Period dei:EntitySmallBusiness
20 001003 - Statement - Consolidated statement of financial position Network

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 http://www.ing.com/taxonomy/role/StatementOfFinancialPositionCurrentNonCurrent-210000
21 Implied Table Table

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22 Statement of financial position [abstract] Abstract ifrs-full:StatementOfFinancialPositionAbstract
23 Assets Abstract ifrs-full:AssetsAbstract
24 Cash and balances with central banks 2 Concept (Monetary) As Of Debit ifrs-full:CashAndBankBalancesAtCentralBanks
25 Loans and advances to banks 3 Concept (Monetary) As Of Debit ifrs-full:LoansAndAdvancesToBanks
26 Financial assets at fair value through profit or loss 4 Abstract ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossAbstract
27 - trading assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTrading
28 - non-trading derivatives Concept (Monetary) As Of Debit ing:FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForNonTradingDerivatives
29 - designated as at fair value through profit or loss Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossDesignatedAsUponInitialRecognition
30 - mandatorily at fair value through profit or loss Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossMandatorilyMeasuredAtFairValue
31 Investments Concept (Monetary) As Of Debit ing:FinancialAssetsAvailableForSaleAndHeldToMaturityInvestments
32 Financial assets at fair value through other comprehensive income 5 Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncome
33 Securities at amortised cost 6 Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtAmortisedCost
34 Loans and advances to customers 7 Concept (Monetary) As Of Debit ifrs-full:LoansAndAdvancesToCustomers
35 Investments in associates and joint ventures 8 Concept (Monetary) As Of Debit ifrs-full:InvestmentAccountedForUsingEquityMethod
36 Property and equipment 9 Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
37 Intangible assets 10 Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsAndGoodwill
38 Current tax assets Concept (Monetary) As Of Debit ifrs-full:CurrentTaxAssets
39 Deferred tax assets 37 Concept (Monetary) As Of Debit ifrs-full:DeferredTaxAssets
40 Other assets 11 Concept (Monetary) As Of Debit ifrs-full:OtherAssets
41 Assets held for sale 12 Concept (Monetary) As Of Debit ifrs-full:NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSale
42 Total assets Concept (Monetary) As Of Debit ifrs-full:Assets
43 Liabilities Abstract ifrs-full:LiabilitiesAbstract
44 Deposits from banks 13 Concept (Monetary) As Of Credit ifrs-full:DepositsFromBanks
45 Customer deposits 14 Concept (Monetary) As Of Credit ifrs-full:DepositsFromCustomers
46 Financial liabilities at fair value through profit or loss 15 Abstract ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossAbstract
47 - trading liabilities Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossClassifiedAsHeldForTrading
48 - non-trading derivatives Concept (Monetary) As Of Credit ing:FinancialLiabilitiesAtFairValueThroughProfitOrLossClassifiedAsHeldForNonTradingDerivatives
49 - designated as at fair value through profit or loss Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedAsUponInitialRecognition
50 Current tax liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentTaxLiabilities
51 Deferred tax liabilities 37 Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilities
52 Provisions 16 Concept (Monetary) As Of Credit ifrs-full:Provisions
53 Other liabilities 17 Concept (Monetary) As Of Credit ifrs-full:OtherLiabilities
54 Debt securities in issue 18 Concept (Monetary) As Of Credit ifrs-full:DebtSecurities
55 Subordinated loans 19 Concept (Monetary) As Of Credit ifrs-full:SubordinatedLiabilities
56 Total liabilities Concept (Monetary) As Of Credit ifrs-full:Liabilities
57 Equity 20 Abstract ifrs-full:EquityAbstract
58 Share capital and share premium Concept (Monetary) As Of Credit ing:ShareCapitalAndSharePremium
59 Other reserves Concept (Monetary) As Of Credit ifrs-full:OtherReserves
60 Retained earnings Concept (Monetary) As Of Credit ing:InvestmentRecognisedWhenControlInSubsidiaryIsLost
61 Shareholders' equity (parent) Concept (Monetary) As Of Credit ifrs-full:EquityAttributableToOwnersOfParent
62 Non-controlling interests Concept (Monetary) As Of Credit ifrs-full:NoncontrollingInterests
63 Total equity Concept (Monetary) As Of Credit ifrs-full:Equity
64 Total liabilities and equity Concept (Monetary) As Of Credit ifrs-full:EquityAndLiabilities
65 001004 - Statement - Consolidated statement of profit or loss Network

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 http://www.ing.com/taxonomy/role/StatementOfComprehensiveIncomeProfitOrLossByFunctionOfExpense-310000
66 Implied Table Table

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67 Profit or loss [abstract] Abstract ifrs-full:IncomeStatementAbstract
68 Continuing operations Abstract ing:ContinuingOperationsAbstract
69 Interest income using effective interest rate Concept (Monetary) For Period Credit ifrs-full:InterestRevenueCalculatedUsingEffectiveInterestMethod
70 Other interest income Concept (Monetary) For Period Credit ing:InterestIncomeNotUsingEffectiveInterestMethod
71 Total Interest income 21 Concept (Monetary) For Period Credit ifrs-full:RevenueFromInterest
72 Interest expense using effective interest rate Concept (Monetary) For Period Debit ing:InterestExpensesCalculatedUsingEffectiveInterestMethod
73 Other interest expense Concept (Monetary) For Period Debit ifrs-full:InterestExpenseOnOtherFinancialLiabilities
74 Total interest expense 21 Concept (Monetary) For Period Debit ifrs-full:InterestExpense
75 Net interest income Concept (Monetary) For Period Credit ifrs-full:InterestRevenueExpense
76 Fee and commission income Concept (Monetary) For Period Credit ifrs-full:FeeAndCommissionIncome
77 Fee and commission expense Concept (Monetary) For Period Debit ifrs-full:FeeAndCommissionExpense
78 Net fee and commission income 22 Concept (Monetary) For Period Credit ifrs-full:FeeAndCommissionIncomeExpense
79 Valuation results and net trading income 22 Concept (Monetary) For Period Credit ifrs-full:TradingIncomeExpense
80 Investment income 24 Concept (Monetary) For Period Credit ifrs-full:InvestmentIncome
81 Share of result from associates and joint ventures 8 Concept (Monetary) For Period Credit ifrs-full:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
82 Result on disposal of group companies 25 Concept (Monetary) For Period Credit ifrs-full:GainsOnDisposalsOfInvestments
83 Other income 26 Concept (Monetary) For Period Credit ifrs-full:OtherIncome
84 Total income Concept (Monetary) For Period Credit ifrs-full:Revenue
85 Addition to loan loss provisions 7 Concept (Monetary) For Period ifrs-full:AdditionalAllowanceRecognisedInProfitOrLossAllowanceAccountForCreditLossesOfFinancialAssets
86 Staff expenses 27 Concept (Monetary) For Period Debit ifrs-full:EmployeeBenefitsExpense
87 Other operating expenses 28 Concept (Monetary) For Period Debit ifrs-full:OtherExpenseByNature
88 Total expenses Concept (Monetary) For Period Debit ifrs-full:ExpenseByNature
89 Result before tax from continuing operations Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
90 Taxation 38 Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
91 Net result from continuing operations Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromContinuingOperations
92 Discontinued operations 29 Abstract ing:DiscontinuedOperationsAbstract
93 Net result from discontinued operations Concept (Monetary) For Period Credit ing:NetResultOfDiscontinuedOperations
94 Net result from classification as discontinued operations Concept (Monetary) For Period Credit ifrs-full:GainLossRecognisedOnMeasurementToFairValueLessCostsToSellOrOnDisposalOfAssetsOrDisposalGroupsConstitutingDiscontinuedOperation
95 Net result from disposal of discontinued operations Concept (Monetary) For Period Credit ing:NetResultFromDisposalOfDiscontinuedOperations
96 Total net result from discontinued operations Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromDiscontinuedOperations
97 Net result attributable to Equityholders of the parent Abstract ing:NetResultAttributableToEquityholdersOfTheParentAbstract
98 from continuing operations Concept (Monetary) For Period Credit ifrs-full:IncomeFromContinuingOperationsAttributableToOwnersOfParent
99 from discontinued operations Concept (Monetary) For Period Credit ifrs-full:IncomeFromDiscontinuedOperationsAttributableToOwnersOfParent
100 Net result (before non-controlling interests) Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOrdinaryEquityHoldersOfParentEntity
101 Net result attributable to Non-controlling interests Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToNoncontrollingInterests
102 Net result attributable to Equityholders of the parent Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOwnersOfParent
103 Net result attributable to Non-controlling interests Abstract ing:NetResultAttributableToNoncontrollingInterestsAbstract
104 Net result attributable to Non-controlling interests from continuing operations Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromContinuingOperationsAttributableToNoncontrollingInterests
105 Net result attributable to Non-controlling interests from discontinued operations Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromDiscontinuedOperationsAttributableToNoncontrollingInterests
106 Net result attributable to Non-controlling interests Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToNoncontrollingInterests
107 Earnings per ordinary share 30 Abstract ifrs-full:BasicAndDilutedEarningsPerShareAbstract
108 Basic earnings per ordinary share Concept (Share) For Period ifrs-full:BasicEarningsLossPerShare
109 Diluted earnings per ordinary share Concept (Share) For Period ifrs-full:DilutedEarningsLossPerShare
110 Earnings per ordinary share from continuing operations 30 Abstract ing:BasicAndDilutedEarningsPerShareContinuingOperationsAbstract
111 Basic earnings per ordinary share from continuing operations Concept (Share) For Period ifrs-full:BasicEarningsLossPerShareFromContinuingOperations
112 Diluted earnings per ordinary share from continuing operations Concept (Share) For Period ifrs-full:DilutedEarningsLossPerShareFromContinuingOperations
113 Dividend per ordinary share 31 Concept (Share) For Period ifrs-full:DividendsRecognisedAsDistributionsToOwnersPerShare
114 001005 - Statement - Consolidated statement of comprehensive income Network

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 http://www.ing.com/taxonomy/role/StatementOfComprehensiveIncomeOCIComponentsPresentedNetOfTax-410000
115 Implied Table Table

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 implied:Table
116 Statement of comprehensive income [abstract] Abstract ifrs-full:StatementOfComprehensiveIncomeAbstract
117 Net result (before non-controlling interests) Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOrdinaryEquityHoldersOfParentEntity
118 Other comprehensive income Abstract ifrs-full:OtherComprehensiveIncomeAbstract
119 Items that will not be reclassified to the statement of profit or loss: Abstract ifrs-full:ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossBeforeTaxAbstract
120 Realised and unrealised revaluations property in own use Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRevaluation
121 Remeasurement of the net defined benefit asset/liability 37 Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans
122 Net change in fair value of equity instruments at fair value through other comprehensive income Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesFromInvestmentsInEquityInstruments
123 Change in fair value of own credit risk of financial liabilities at fair value through profit or loss Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxChangeInFairValueOfFinancialLiabilityAttributableToChangeInCreditRiskOfLiability
124 Items that may subsequently be reclassified to the statement of profit or loss: Abstract ifrs-full:ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTaxAbstract
125 Unrealised revaluations available-for-sale investments and other revaluations Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnRemeasuringAvailableforsaleFinancialAssetsNetOfTax
126 Realised gains/losses transferred to the statement of profit or loss Concept (Monetary) For Period Debit ifrs-full:ReclassificationAdjustmentsOnAvailableforsaleFinancialAssetsNetOfTax
127 Net change in fair value of debt instruments at fair value through other comprehensive income Concept (Monetary) For Period Debit ing:RealisedGainsLossesOnDebtInstrumentsAtFairValueThroughOtherComprehensiveIncomeTransferredToTheStatementOfProfitOrLossNetOfTax
128 Realised gains/losses on debt instruments at fair value through other comprehensive income reclassified to the statement of profit or loss Concept (Monetary) For Period Credit ifrs-full:GainsLossesRecognisedInOtherComprehensiveIncomeOnFinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionOrSubsequently
129 Changes in cash flow hedges Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxCashFlowHedges
130 Transfer to insurance liabilities/DAC Concept (Monetary) For Period Credit ing:TransferToFromInsuranceLiabilitiesAndDeferredAcquisitionCostBeforeTax
131 Exchange rate differences Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation
132 Share of other comprehensive income of associates and joint ventures and other income Concept (Monetary) For Period Credit ifrs-full:ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossNetOfTax
133 Total comprehensive income Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
134 Comprehensive income attributable to: Abstract ifrs-full:ComprehensiveIncomeAttributableToAbstract
135 Non-controlling interests Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncomeAttributableToNoncontrollingInterests
136 Equityholders of the parent Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncomeAttributableToOwnersOfParent
137 Total comprehensive income Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
138 001006 - Statement - Consolidated statement of changes in equity Network

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 http://www.ing.com/taxonomy/role/StatementOfChangesInEquity-610000
139 Statement of changes in equity [Table] Table

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 ifrs-full:StatementOfChangesInEquityTable
140 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
141 Equity [member] Member ifrs-full:EquityMember
142 Share capital and share premium [Member] Member ing:ClassesOfShareCapitalAndSharePremiumMember
143 Other reserves [Member] Member ifrs-full:OtherReservesMember
144 Retained earnings [member] Member ifrs-full:RetainedEarningsMember
145 Shareholders' equity (parent) [Member] Member ifrs-full:EquityAttributableToOwnersOfParentMember
146 Non-controlling interests [Member] Member ifrs-full:NoncontrollingInterestsMember
147 Legal Entity [Axis] Axis dei:LegalEntityAxis
148 Entity [Domain] Member dei:EntityDomain
149 NN Group [member] Member ing:NNGroupMember
150 Statement Of Changes In Equity [Line Items] LineItems ifrs-full:StatementOfChangesInEquityLineItems
151 Balance Concept (Monetary) As Of Credit ifrs-full:Equity
152 Effect of change in accounting policy Concept (Monetary) As Of Credit ing:ImpactOfAdoptionOfIfrs9OnEquityComponent
153 Net change in fair value of equity instruments at fair value through other comprehensive income Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesFromInvestmentsInEquityInstruments
154 Net change in fair value of debt instruments at fair value through other comprehensive income Concept (Monetary) For Period Debit ing:RealisedGainsLossesOnDebtInstrumentsAtFairValueThroughOtherComprehensiveIncomeTransferredToTheStatementOfProfitOrLossNetOfTax
155 Realised gains/losses on debt instruments at fair value through other comprehensive income reclassified to the statement of profit or loss Concept (Monetary) For Period Credit ifrs-full:GainsLossesRecognisedInOtherComprehensiveIncomeOnFinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionOrSubsequently
156 Unrealised revaluations available-for-sale investments and other revaluations Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnRemeasuringAvailableforsaleFinancialAssetsNetOfTax
157 Realised gains/losses transferred to the statement of profit or loss Concept (Monetary) For Period Debit ifrs-full:ReclassificationAdjustmentsOnAvailableforsaleFinancialAssetsNetOfTax
158 Changes in cash flow hedge reserve Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxCashFlowHedges
159 Realised and unrealised revaluations property in own use Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRevaluation
160 Remeasurement of the net defined benefit asset/liability 37 Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans
161 Transfer to insurance liabilities/DAC Concept (Monetary) For Period Credit ing:TransferToFromInsuranceLiabilities
162 Exchange rate differences Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation
163 Share of other comprehensive income of associates and joint ventures and other income Concept (Monetary) For Period Credit ifrs-full:ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
164 Change in fair value of own credit risk of financial liabilities at fair value through profit or loss Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxChangeInFairValueOfFinancialLiabilityAttributableToChangeInCreditRiskOfLiability
165 Total amount recognised directly in other comprehensive income net of tax Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncome
166 Net result Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOrdinaryEquityHoldersOfParentEntity
167 Total comprehensive income net of tax Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
168 Dividends 31 Concept (Monetary) For Period Debit ifrs-full:DividendsPaid
169 Coupon on Undated subordinated notes issued by NN Group Concept (Monetary) For Period Debit ing:CouponOnUndatedSubordinatedNotesIssued
170 Changes in treasury shares Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughTreasuryShareTransactions
171 Employee stock options and share plans Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions
172 Changes in composition of the group and other changes Concept (Monetary) For Period Credit ing:IncreaseDecreaseThroughChangesInCompositionOfTheGroupAndOtherChanges
173 Balance Concept (Monetary) As Of Credit ifrs-full:Equity
174 001007 - Statement - Consolidated statement of cash flows Network

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 http://www.ing.com/taxonomy/role/StatementOfCashFlowsDirectMethod-510000
175 Implied Table Table

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176 Statement of cash flows [abstract] Abstract ifrs-full:StatementOfCashFlowsAbstract
177 Cash flows from operating activities 32 Abstract ifrs-full:CashFlowsFromUsedInOperatingActivitiesAbstract
178 Results before tax Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
179 Adjusted for: - depreciation and amortisation Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDepreciationAndAmortisationExpense
180 -Increase (decrease) in insurance, reinsurance and investment contract liabilities Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncreaseDecreaseInInsuranceReinsuranceAndInvestmentContractLiabilities
181 - Addition to loan loss provisions Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForProvisions
182 - Other Concept (Monetary) For Period Debit ifrs-full:OtherAdjustmentsToReconcileProfitLoss
183 Taxation paid Concept (Monetary) For Period Credit ifrs-full:IncomeTaxesPaidClassifiedAsOperatingActivities
184 - Net change in Loans and advances to/from banks, not available/payable on demand Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInLoansAndAdvancesToBanks
185 - Net change in Trading assets and Trading liabilities Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables
186 - Loans and advances to customers Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInLoansAndAdvancesToCustomers
187 - Customer deposits Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncreaseDecreaseInDepositsFromCustomers
188 - Other Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncreaseDecreaseInOtherLiabilities
189 Net cash flow from/(used in) operating activities Concept (Monetary) For Period ifrs-full:CashFlowsFromUsedInOperatingActivities
190 Cash flows from investing activities Abstract ifrs-full:CashFlowsFromUsedInInvestingActivitiesAbstract
191 - Acquisition of subsidiaries, net of cash acquired Concept (Monetary) For Period Credit ing:PurchaseOfSubsidiaryNetOfCashAquired
192 - Associates and joint ventures Concept (Monetary) For Period Credit ifrs-full:PurchaseOfInterestsInInvestmentsAccountedForUsingEquityMethod
193 - available-for-sale investments Concept (Monetary) For Period Credit ifrs-full:PurchaseOfAvailableforsaleFinancialAssets
194 - held-to-maturity investments Concept (Monetary) For Period Credit ifrs-full:PurchaseOfFinancialInstrumentsClassifiedAsInvestingActivities
195 - Financial assest at fair value through other comprehensive income Concept (Monetary) For Period Credit ing:PurchaseOfFinancialAssetsAtFairValueThroughOtherComprehensiveIncome
196 - Securities at amortised cost Concept (Monetary) For Period Credit ing:PurchaseOfSecuritiesAtAmortisedCost
197 - property and equipment Concept (Monetary) For Period Credit ifrs-full:PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities
198 - Assets subject to operating leases Concept (Monetary) For Period Credit ing:AssetsSubjectToOperatingLeasesClassifiedAsInvestingActivities
199 - Loans purchased Concept (Monetary) For Period Credit ing:PaymentsForPurchaseOfLoans
200 - Investments for risk of policyholders Concept (Monetary) For Period Credit ing:InvestmentsForRiskOfPolicyholdersClassifiedAsInvestingActivities
201 - Other investments Concept (Monetary) For Period Debit ifrs-full:OtherInflowsOutflowsOfCashClassifiedAsInvestingActivities
202 Disposals and - group companies (including cash in redemptions: company disposed) Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromLosingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities
203 - associates and joint ventures Concept (Monetary) For Period Debit ing:DisposalsAndRedemptionsInAssociatesAndJointVentures
204 - available-for-sale investments Concept (Monetary) For Period Debit ifrs-full:ProceedsFromDisposalOrMaturityOfAvailableforsaleFinancialAssets
205 - held-to-maturity investments Concept (Monetary) For Period Debit ifrs-full:ProceedsFromSalesOrMaturityOfFinancialInstrumentsClassifiedAsInvestingActivities
206 - Financial assest at fair value through other comprehensive income Concept (Monetary) For Period Debit ing:ProceedsFromSaleOfFinancialAssestAtFairValueThroughOtherComprehensiveIncome
207 - Securities at amortised cost Concept (Monetary) For Period Debit ing:ProceedsFromSaleOfSecuritiesAtAmortisedCost
208 - Property and equipment Concept (Monetary) For Period Debit ifrs-full:ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities
209 - Assets subject to operating leases Concept (Monetary) For Period Debit ing:DisposalsAndRedemptionsInAssetsSubjectToOperatingLeases
210 - Investments for risk of policyholders Concept (Monetary) For Period Debit ing:DisposalsAndRedemptionsInInvestmentsForRiskOfPolicyholders
211 - Loans sold Concept (Monetary) For Period Debit ing:DisposalsAndRedemptionsInLoans
212 - other investments Concept (Monetary) For Period Debit ing:DisposalsAndRedemptionsFromOtherInvestments
213 Net cash flow from/(used in) investing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInInvestingActivities
214 Cash flows from financing activities Abstract ifrs-full:CashFlowsFromUsedInFinancingActivitiesAbstract
215 Proceeds from debt securities Concept (Monetary) For Period Debit ifrs-full:ProceedsFromIssueOfBondsNotesAndDebentures
216 Repayments of debt securities Concept (Monetary) For Period Credit ifrs-full:RepaymentsOfBondsNotesAndDebentures
217 Proceeds from issuance of subordinated loans Concept (Monetary) For Period Debit ifrs-full:ProceedsFromIssueOfSubordinatedLiabilities
218 Repayments of subordinated loans Concept (Monetary) For Period Credit ifrs-full:RepaymentsOfSubordinatedLiabilities
219 Purchase/sale of treasury shares Concept (Monetary) For Period Debit ifrs-full:ProceedsFromSaleOrIssueOfTreasuryShares
220 Dividends paid Concept (Monetary) For Period Credit ifrs-full:DividendsPaidClassifiedAsFinancingActivities
221 Net cash flow from/(used in) financing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInFinancingActivities
222 Net cash flow Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges
223 Cash and cash equivalents at beginning of year Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
224 Effect of exchange rate changes on cash and cash equivalents Concept (Monetary) For Period Debit ifrs-full:EffectOfExchangeRateChangesOnCashAndCashEquivalents
225 Cash and cash equivalents at end of year Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
226 001008 - Statement - Consolidated statement of cash flows (Parenthetical) Network

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 http://www.ing.com/taxonomy/role/StatementOfCashFlowsDirectMethod-510000Parenthetical
227 Statement [Table] Table

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228 Legal Entity [Axis] Axis dei:LegalEntityAxis
229 Entity [Domain] Member dei:EntityDomain
230 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
231 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
232 NN Group [member] Member ing:NNGroupMember
233 Statement [Line Items] LineItems us-gaap:StatementLineItems
234 Proceeds from available-for-sale investments Concept (Monetary) For Period Debit ifrs-full:ProceedsFromDisposalOrMaturityOfAvailableforsaleFinancialAssets
235 Proceeds from sale of entity shares Concept (Monetary) For Period Debit ifrs-full:ProceedsFromSalesOfInterestsInAssociates
236 Proceeds from sale of additional shares Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromLosingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities
237 Disposal and redemptions in group companies Concept (Monetary) For Period Debit ing:DisposalAndRedemptionsInGroupCompanies
238 Repayment of subordinated loans Concept (Monetary) For Period Credit ifrs-full:RepaymentsOfSubordinatedLiabilities
239 Cash and balances with central banks Concept (Monetary) As Of Debit ifrs-full:CashAndBankBalancesAtCentralBanks
240 Interest received Concept (Monetary) For Period Debit ifrs-full:InterestReceivedClassifiedAsOperatingActivities
241 Interest paid Concept (Monetary) For Period Credit ifrs-full:InterestPaidClassifiedAsOperatingActivities
242 Interest income (expense) Concept (Monetary) For Period Debit ing:NetInterestReceivedPaid
243 Dividend received Concept (Monetary) For Period Debit ifrs-full:DividendsReceivedClassifiedAsOperatingActivities
244 Dividend paid Concept (Monetary) For Period Credit ifrs-full:DividendsPaidClassifiedAsFinancingActivities
245 001009 - Disclosure - Reporting entity Network

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 http://www.ing.com/taxonomy/role/NotesToFinancialStatementsReportingEntityExplanatory
246 Implied Table Table

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247 Disclosure of reporting entity [Abstract] Abstract ing:DisclosureOfReportingEntityAbstract
248 Reporting entity Concept (Text Block (HTML)) For Period ing:ReportingEntityExplanatory
249 001010 - Disclosure - Basis of preparation of the Consolidated financial statements Network

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 http://www.ing.com/role/BasisOfPreparationOfTheConsolidatedFinancialStatements
250 Implied Table Table

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251 Disclosure of basis of preparation of consolidated annual accounts [abstract] Abstract ing:DisclosureOfBasisOfPreparationOfConsolidatedAnnualAccountsAbstract
252 Basis of preparation of the Consolidated financial statements Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfBasisOfPreparationOfFinancialStatementsExplanatory
253 001011 - Disclosure - Accounting policies Network

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257 001012 - Disclosure - Cash and balances with central banks Network

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261 001013 - Disclosure - Loans and advances to banks Network

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265 001014 - Disclosure - Financial assets at fair value through profit or loss Network

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266 Implied Table Table

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269 001015 - Disclosure - Financial assets at fair value through other comprehensive income Network

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270 Implied Table Table

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273 001016 - Disclosure - Securities at amortised cost Network

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274 Implied Table Table

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277 001017 - Disclosure - Loans and advances to customers Network

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278 Implied Table Table

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280 Loans and advances to customers Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfLoansAndAdvancesToCustomersExplanatory
281 001018 - Disclosure - Investments in associates and joint ventures Network

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283 Disclosure Of Significant Investments In Principal Subsidiaries Associates And Joint Ventures [Abstract] Abstract ing:DisclosureOfSignificantInvestmentsInPrincipalSubsidiariesAssociatesAndJointVenturesAbstract
284 Investments in associates and joint ventures Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInvestmentsAccountedForUsingEquityMethodExplanatory
285 001019 - Disclosure - Property and equipment Network

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288 Property and equipment Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfPropertyPlantAndEquipmentExplanatory
289 001020 - Disclosure - Intangible assets Network

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293 001021 - Disclosure - Other assets Network

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297 001022 - Disclosure - Assets and liabilities held for sale Network

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300 Assets and liabilities held for sale Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfNoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSaleExplanatory
301 001023 - Disclosure - Deposits from banks Network

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302 Implied Table Table

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305 001024 - Disclosure - Customer deposits Network

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306 Implied Table Table

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308 Schedule of Customer Deposits Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDepositsFromCustomersExplanatory
309 001025 - Disclosure - Financial liabilities at fair value through profit or loss Network

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311 Disclosure of financial liabilities [abstract] Abstract ifrs-full:DisclosureOfFinancialLiabilitiesAbstract
312 Financial liabilities at fair value through profit or loss Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinancialLiabilitiesExplanatory
313 001026 - Disclosure - Provisions Network

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316 Provisions Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfProvisionsExplanatory
317 001027 - Disclosure - Other liabilities Network

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320 Other liabilities Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfOtherLiabilitiesExplanatory
321 001028 - Disclosure - Debt securities in issue Network

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325 001029 - Disclosure - Subordinated loans Network

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327 Disclosure subordinated liabilities [abstract] Abstract ing:DisclosureSubordinatedLiabilitiesAbstract
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329 001030 - Disclosure - Equity Network

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333 001031 - Disclosure - Net interest income Network

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337 001032 - Disclosure - Net fee and commission income Network

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341 001033 - Disclosure - Valuation results and net trading income Network

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345 001034 - Disclosure - Investment income Network

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349 001035 - Disclosure - Result on disposal of group companies Network

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350 Implied Table Table

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351 Gains (losses) on disposals of non-current assets [abstract] Abstract ifrs-full:GainsLossesOnDisposalsOfNoncurrentAssetsAbstract
352 Result on disposal of group companies Concept (Text Block (HTML)) For Period ing:DisclosureOfGainsLossesOnDisposalsOfNoncurrentAssetsExplanatory
353 001036 - Disclosure - Other income Network

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354 Implied Table Table

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357 001037 - Disclosure - Staff expenses Network

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358 Implied Table Table

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361 001038 - Disclosure - Other operating expenses Network

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363 Disclosure of Other Operating Expense [Abstract] Abstract ing:DisclosureOfOtherOperatingExpenseAbstract
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365 001039 - Disclosure - Discontinued operations Network

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369 001040 - Disclosure - Earnings per ordinary share Network

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373 001041 - Disclosure - Dividend per ordinary share Network

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377 001042 - Disclosure - Net cash flow from operating activities Network

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380 Net cash flow from operating activities Concept (Text Block (HTML)) For Period ing:DisclosureOfNetCashFlowFromOperatingActivitiesExplanatory
381 001043 - Disclosure - Changes in liabilities arising from financing activities Network

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382 Implied Table Table

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384 Changes in liabilities arising from financing activities Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInformationThatEnablesUsersOfFinancialStatementsToEvaluateChangesInLiabilitiesArisingFromFinancingActivitiesExplanatory
385 001044 - Disclosure - Cash and cash equivalents Network

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386 Implied Table Table

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388 Cash and cash equivalents Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCashAndCashEquivalentsExplanatory
389 001045 - Disclosure - Segments Network

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393 001046 - Disclosure - Information on geographical areas Network

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397 001047 - Disclosure - Pension and other post-employment benefits Network

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398 Implied Table Table

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400 Pension and other post-employment benefits Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfEmployeeBenefitsExplanatory
401 001048 - Disclosure - Taxation Network

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405 001049 - Disclosure - Fair value of assets and liabilities Network

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406 Implied Table Table

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408 Fair value of assets and liabilities Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFairValueMeasurementExplanatory
409 001050 - Disclosure - Derivatives and hedge accounting Network

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412 Derivatives and hedge accounting Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfGeneralHedgeAccountingExplanatory
413 001051 - Disclosure - Assets by contractual maturity Network

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414 Implied Table Table

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417 001052 - Disclosure - Liabilities by maturity Network

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420 Liabilities by maturity Concept (Text Block (HTML)) For Period ing:DisclosureOfLiabilitiesByMaturityExplanatory
421 001053 - Disclosure - Assets not freely disposable Network

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422 Implied Table Table

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425 001054 - Disclosure - Transfer of financial assets Network

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428 Transfer of financial assets Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfTransfersOfFinancialAssetsExplanatory
429 001055 - Disclosure - Offsetting financial assets and liabilities Network

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432 Offsetting financial assets and liabilities Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfOffsettingOfFinancialAssetsAndFinancialLiabilitiesExplanatory
433 001056 - Disclosure - Contingent liabilities and commitments Network

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435 Disclosure of contingent liabilities [abstract] Abstract ifrs-full:DisclosureOfContingentLiabilitiesAbstract
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437 001057 - Disclosure - Legal proceedings Network

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441 001058 - Disclosure - Consolidated companies and business acquired and divested Network

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444 Consolidated companies and business acquired and divested Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfBusinessCombinationsExplanatory
445 001059 - Disclosure - Principal subsidiaries, investments in associates and joint ventures Network

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448 Principal subsidiaries, investments in associates and joint ventures Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInterestsInOtherEntitiesExplanatory
449 001060 - Disclosure - Structured entities Network

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452 Structured entities Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInformationAboutConsolidatedStructuredEntitiesExplanatory
453 001061 - Disclosure - Related parties Network

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454 Implied Table Table

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455 Related party transactions [abstract] Abstract ifrs-full:RelatedPartyTransactionsAbstract
456 Related parties Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfRelatedPartyExplanatory
457 001062 - Disclosure - Subsequent events Network

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458 Implied Table Table

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460 Subsequent events Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfEventsAfterReportingPeriodExplanatory
461 001063 - Disclosure - Risk management section Network

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462 Implied Table Table

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464 Risk management section Concept (Text Block (HTML)) For Period ing:DisclosureOfFinancialInstrumentsAndFinancialRiskManagementExplanatory
465 001064 - Disclosure - Capital management section Network

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467 Disclosure Of Capital Management [abstract] Abstract ing:DisclosureOfCapitalManagementAbstract
468 Capital management Concept (Text Block (HTML)) For Period ing:DisclosureOfDetailedInformationAboutCapitalManagementExplanatory
469 020001 - Disclosure - Accounting policies (Policies) Network

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470 Disclosure of initial application of standards or interpretations [table] Table

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473 In accordance with IFRS 9 [member] Member ifrs-full:InAccordanceWithIFRS9Member
474 IFRS 9 Financial instruments - Impact of adoption [member] Member ing:Ifrs9FinancialInstrumentsMember
475 IFRS 15 Revenue from Contracts with Customers, Impact of adoption [member] Member ifrs-full:IncreaseDecreaseDueToApplicationOfIFRS15Member
476 New IFRSs [axis] Axis ifrs-full:NewIFRSsAxis
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478 IFRS 16 Leases [Member] Member ing:Ifrs16LeasesMember
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480 Changes in IFRS effective in 2018 Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfInitialApplicationOfStandardsOrInterpretations
481 Upcoming changes in IFRS after 2018 Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretations
482 030003 - Disclosure - Accounting policies (Tables) Network

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483 Disclosure of financial assets and liabilities at date of initial application of IFRS 9 [table] Table

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486 Financial assets at amortised cost, category [member] Member ifrs-full:FinancialAssetsAtAmortisedCostCategoryMember
487 Financial assets at fair value through profit or loss, category [member] Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember
488 Financial assets at fair value through other comprehensive income, category [member] Member ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember
489 Categories of financial liabilities [axis] Axis ifrs-full:CategoriesOfFinancialLiabilitiesAxis
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491 Financial liabilities at amortised cost, category [member] Member ifrs-full:FinancialLiabilitiesAtAmortisedCostCategoryMember
492 Financial liabilities designated at fair value through profit or loss [member] Member ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember
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494 Reconciliation of carrying amounts of financial assets on the date of initial application of IFRS 9 Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinancialAssetsAtDateOfInitialApplicationOfIFRS9Explanatory
495 Reconciliation of carrying amounts of financial liabilities on the date of initial application of IFRS 9 Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinancialLiabilitiesAtDateOfInitialApplicationOfIFRS9Explanatory
496 030203 - Disclosure - Cash and balances with central banks (Tables) Network

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497 Implied Table Table

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499 Summary of Cash and Balances with Central Banks Concept (Text Block (HTML)) For Period ing:DisclosureOfIncreaseDecreaseInCashAndBankBalanceWithCentralBankExplanatory
500 030303 - Disclosure - Loans and advances to banks (Tables) Network

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501 Implied Table Table

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503 Schedule of Loans and Advances to Banks Concept (Text Block (HTML)) For Period ing:DisclosureOfLoansAndAdvancesToBanksByGeographyExplanatory
504 030403 - Disclosure - Financial assets at fair value through profit or loss (Tables) Network

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505 Disclosure of financial assets [table] Table

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508 Mandatorily measured at fair value through profit or loss [member] Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossMandatorilyMeasuredAtFairValueCategoryMember
509 Disclosure of financial assets [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsLineItems
510 Summary of financial instruments by type Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinancialInstrumentsExplanatory
511 030503 - Disclosure - Financial assets at fair value through other comprehensive income (Tables) Network

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512 Implied Table Table

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515 Summary of Equity Securities Designated as at Fair Value Tthrough Other Comprehensive Income Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFairValueOfEachInvestmentInEquityInstrumentsDesignatedAsMeasuredAtFairValueThroughOtherComprehensiveIncomeExplanatory
516 Summary of Changes in Fair Value through Other Comprehensive Income Financial Assets Concept (Text Block (HTML)) For Period ing:DisclosureOfChangesInFairValueThroughOtherComprehensiveIncomeFinancialAssetsExplanatory
517 030650 - Disclosure - Securities at amortised cost (Tables) Network

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518 Implied Table Table

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519 Disclosure of financial assets [abstract] Abstract ifrs-full:DisclosureOfFinancialAssetsAbstract
520 Summary of Securities at Amortised Costs Concept (Text Block (HTML)) For Period ing:DisclosureOfSecuritiesAtAmortisedCostsExplanatory
521 Summary of Debt Securities Concept (Text Block (HTML)) For Period ing:DebtInstrumentHeldExplanatory
522 Debt Securities by Type and Balance Sheet Lines Concept (Text Block (HTML)) For Period ing:DisclosureOfDebtSecuritiesByTypeFVTPLFVOCIAndAssetsAtAmortisedCostExplanatory
523 030653 - Disclosure - Loans and advances to customers (Tables) Network

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 http://www.ing.com/role/LoansAndAdvancesToCustomersTables
524 Implied Table Table

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527 Summary of Loans and Advances to Customers by Subordination Concept (Text Block (HTML)) For Period ing:DisclosureOfLoansAndAdvancesToCustomersBySubordinationExplanatory
528 Summary of Loan Loss Provisions Concept (Text Block (HTML)) For Period ing:DisclosureOfLoanLossProvisionsByTypeExplanatory
529 Summary of loans loss provision per stage Concept (Text Block (HTML)) For Period ing:DisclosureOfLoanLossProvisionsPerStageExplanatory
530 Summary of Changes in Loan Loss Provisions Concept (Text Block (HTML)) For Period ing:DisclosureOfChangesInLoanLossProvisionsExplanatory
531 Financial assets modified during the period and since initial recognition Concept (Text Block (HTML)) For Period ing:DisclosureOfFinancialAssetsModifiedSinceInitialRecognitionTextBlock
532 Finance lease receivables Concept (Text Block (HTML)) For Period ing:DisclosureOfFinanceLeaseReceivableByLessorExplanatory
533 030703 - Disclosure - Investments in associates and joint ventures (Tables) Network

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 http://www.ing.com/role/InvestmentsInAssociatesAndJointVenturesTables
534 Implied Table Table

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537 Summary of Changes in Investments in Associates and Joint ventures Concept (Text Block (HTML)) For Period ing:DisclosureOfChangeInInvestmentsInAssociatesAndJointVenturesExplanatory
538 030803 - Disclosure - Property and equipment (Tables) Network

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 http://www.ing.com/role/PropertyAndEquipmentTables
539 Implied Table Table

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542 Schedule of Changes in Property in Own Use Concept (Text Block (HTML)) For Period ing:DisclosureOfPropertyPlantAndEquipmentInOwnUseExplanatory
543 Schedule of Changes in Equipment Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory
544 030903 - Disclosure - Intangible assets (Tables) Network

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 http://www.ing.com/role/IntangibleAssetsTables
545 Implied Table Table

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546 Disclosure of detailed information about intangible assets [abstract] Abstract ifrs-full:DisclosureOfIntangibleAssetsAbstract
547 Schedule of Changes in Intangible Assets Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutIntangibleAssetsExplanatory
548 Schedule of Goodwill Allocation to Group of CGUs Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfGoodwillExplanatory
549 031003 - Disclosure - Other assets (Tables) Network

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*

 http://www.ing.com/role/OtherAssetsTables
550 Implied Table Table

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551 Disclosure of other assets [abstract] Abstract ing:DisclosureOfOtherAssetsAbstract
552 Schedule of Other Assets Concept (Text Block (HTML)) For Period ing:ScheduleOfOtherAssetsExplanatory
553 Schedule of Property Development and Obtained from Foreclosures Concept (Text Block (HTML)) For Period ing:DisclosureOfPropertyDevelopmentAndForeclosuresExplanatory
554 031103 - Disclosure - Deposits from banks (Tables) Network

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 http://www.ing.com/role/DepositsFromBanksTables
555 Implied Table Table

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556 Deposits From Banks [abstract] Abstract ing:DepositsFromBanksAbstract
557 Schedule of Deposits from Banks by Type Concept (Text Block (HTML)) For Period ing:DisclosureOfDepositsFromBanksSplitInInterestAndNoninterestBearingExplanatory
558 031203 - Disclosure - Customer deposits (Tables) Network

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 http://www.ing.com/role/CustomerDepositsTables
559 Implied Table Table

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560 Deposits from customers [abstract] Abstract ifrs-full:DepositsFromCustomersAbstract
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562 Schedule of Customer Deposits by Type Concept (Text Block (HTML)) For Period ing:DisclosureOfDepositsFromCustomersByTypeExplanatory
563 031303 - Disclosure - Financial liabilities at fair value through profit or loss (Tables) Network

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 http://www.ing.com/role/FinancialLiabilitiesAtFairValueThroughProfitOrLossTables
564 Implied Table Table

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566 Summary of Financial Liabilities at Fair Value through Profit or Loss Concept (Text Block (HTML)) For Period ing:DisclosureOfFinancialAssetsAndLiabilitiesAtFairValueThroughProfitLossExplanatory
567 Schedule of Trading Liabilities by Type Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinancialInstrumentsHeldForTradingExplanatory
568 Summary of Non-trading Derivatives by Type Concept (Text Block (HTML)) For Period ing:DisclosureOfFairValueOnNonTradingDerivativesExplanatory
569 Summary of Designated as at Fair Value through Profit or Loss by Type Concept (Text Block (HTML)) For Period ing:DisclosureOfFinancialDerivativeInstrumentLiabilitiesDesignatedAtFairThroughProfitOrLossExplanatory
570 031403 - Disclosure - Provisions (Tables) Network

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 http://www.ing.com/role/ProvisionsTables
571 Implied Table Table

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574 Summary of Changes in Reorganisation Provisions Concept (Text Block (HTML)) For Period ing:DisclosureOfChangesInReorganisationProvisionsExplanatory
575 Summary of Changes in Other Provisions Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfOtherProvisionsExplanatory
576 031503 - Disclosure - Other liabilities (Tables) Network

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 http://www.ing.com/role/OtherLiabilitiesTables
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578 Disclosure of other liabilities [abstract] Abstract ing:DisclosureOfOtherLiabilitiesAbstract
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580 031603 - Disclosure - Debt securities in issue (Tables) Network

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 http://www.ing.com/role/DebtSecuritiesInIssueTables
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584 031703 - Disclosure - Subordinated loans (Tables) Network

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 http://www.ing.com/role/SubordinatedLoansTables
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586 Disclosure subordinated liabilities [abstract] Abstract ing:DisclosureSubordinatedLiabilitiesAbstract
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588 Schedule of Changes in Subordinated Loans Concept (Text Block (HTML)) For Period ing:DisclosureOfChangesInSubordinatedLiabilitiesExplanatory
589 031803 - Disclosure - Equity (Tables) Network

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 http://www.ing.com/role/EquityTables
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598 Currency Translation Reserve [member] Member ifrs-full:ReserveOfChangeInValueOfForeignCurrencyBasisSpreadsMember
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600 Treasury Shares [member] Member ifrs-full:TreasurySharesMember
601 Retained earnings [member] Member ifrs-full:RetainedEarningsMember
602 Non-distributive reserves Member ing:ReserveOfNonDistributableProfitsMember
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604 Summary of Equity Concept (Text Block (HTML)) For Period ing:DisclosureOfEquityExplanatory
605 Schedule of Share Capital Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfClassesOfShareCapitalExplanatory
606 Reserves And Other Equity Interest Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfReservesAndOtherEquityInterestExplanatory
607 031903 - Disclosure - Net interest income (Tables) Network

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610 Summary of Net Interest Income Concept (Text Block (HTML)) For Period ing:DisclosureOfClassificationsOfInterestIncomeExpenseExplanatory
611 Impact of adoption of IFRS 9 on interest income and and expense presentation Concept (Text Block (HTML)) For Period ing:DisclosureOnImpactOfAdoptionOfIfrs9OnInterestIncomeAndAndExpensePresentationTextBlock
612 032003 - Disclosure - Net commission income (Tables) Network

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 http://www.ing.com/role/NetCommissionIncomeTables
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616 Schedule of Fee and Commission Expense Concept (Text Block (HTML)) For Period ing:DisclosureOfFeeAndCommissionExpenseExplanatory
617 032103 - Disclosure - Valuation results and net trading income (Tables) Network

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 http://www.ing.com/role/ValuationResultsAndNetTradingIncomeTables
618 Implied Table Table

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620 Summary of Valuation Results and Net Trading Income Concept (Text Block (HTML)) For Period ing:DisclosureOfDetailedInformationAboutValuationResultsAndNetTradingIncomeExplanatory
621 032203 - Disclosure - Investment income (Tables) Network

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 http://www.ing.com/role/InvestmentIncomeTables
622 Implied Table Table

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625 Summary of Impairments and Reversals of Impairment on Investments per Segment Concept (Text Block (HTML)) For Period ing:DisclosureOfImpairmentLossAndReversalOfImpairmentLossOnInvestmentBySegmentExplanatory
626 032303 - Disclosure - Result on disposal of group companies (Tables) Network

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 http://www.ing.com/role/ResultOnDisposalOfGroupCompaniesTables
627 Implied Table Table

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628 Gains (losses) on disposals of non-current assets [abstract] Abstract ifrs-full:GainsLossesOnDisposalsOfNoncurrentAssetsAbstract
629 Summary of Result on Disposal of Group Companies Concept (Text Block (HTML)) For Period ing:DisclosureResultOnDisposalOfGroupCompaniesExplanatory
630 032501 - Disclosure - Staff expenses (Tables) Network

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 http://www.ing.com/role/StaffExpensesTables
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632 Classes Of Employee Benefits Expense [abstract] Abstract ifrs-full:ClassesOfEmployeeBenefitsExpenseAbstract
633 Summary of Staff Expenses Concept (Text Block (HTML)) For Period ing:DisclosureOfStaffExpenseIncludingPensionAndOtherStaffRelatedCostExplanatory
634 Summary of Number of Employees Concept (Text Block (HTML)) For Period ing:DisclosureOfNumberOfEmployeesExplanatory
635 Summary of Changes in Option Rights Outstanding Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfNumberAndWeightedAverageExercisePricesOfShareOptionsExplanatory
636 Summary of Stock Options Outstanding and Exercisable Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfNumberAndWeightedAverageRemainingContractualLifeOfOutstandingShareOptionsExplanatory
637 Summary of Changes in Share Awards Concept (Text Block (HTML)) For Period ing:DisclosureOfNumberAndWeightedAverageGrantFairValuePricesOfShareAwardsExplanatory
638 032603 - Disclosure - Other operating expenses (Tables) Network

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*

 http://www.ing.com/role/OtherOperatingExpensesTables
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642 Summary of Audit and Non-audit Services Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfAdditionalInformationExplanatory
643 Summary of Impairments and reversals of property and equipment and intangibles Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfImpairmentLossAndReversalOfImpairmentLossExplanatory
644 032803 - Disclosure - Earnings per ordinary share (Tables) Network

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 http://www.ing.com/role/EarningsPerOrdinaryShareTables
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646 Basic earnings per share [abstract] Abstract ifrs-full:BasicEarningsPerShareAbstract
647 Summary of Earnings Per Ordinary Share Concept (Text Block (HTML)) For Period ifrs-full:EarningsPerShareExplanatory
648 032903 - Disclosure - Dividend per ordinary share (Tables) Network

*

*

 http://www.ing.com/role/DividendPerOrdinaryShareTables
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652 033003 - Disclosure - Net cash flow from operating activities (Tables) Network

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 http://www.ing.com/role/NetCashFlowFromOperatingActivitiesTables
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655 Cash flows from operating activities Concept (Text Block (HTML)) For Period ing:ScheduleOfCashflowFromOperatingActivities
656 033103 - Disclosure - Changes in liabilities arising from financing activities (Tables) Network

*

*

 http://www.ing.com/role/ChangesInLiabilitiesArisingFromFinancingActivitiesTables
657 Implied Table Table

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659 Summary of Changes in Liabilties Arising from Financing Activities Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesExplanatory
660 033203 - Disclosure - Cash and cash equivalents (Tables) Network

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 http://www.ing.com/role/CashAndCashEquivalentsTables
661 Implied Table Table

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663 Cash And Cash Equivalents Concept (Text Block (HTML)) For Period ing:ScheduleOfCashAndCashEquivalentsExplanatory
664 033303 - Disclosure - Segments (Tables) Network

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 http://www.ing.com/role/SegmentsTables
665 Implied Table Table

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666 Disclosure of operating segments [abstract] Abstract ifrs-full:DisclosureOfOperatingSegmentsAbstract
667 Summary of Reconciliation Between Underlying and IFRS Income, Expenses and Net Result Concept (Text Block (HTML)) For Period ing:DisclosureOfOperatingSegmentsUnderlyingIncomeExpensesExplanatory
668 Schedule of ING Group Total Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfOperatingSegmentsExplanatory
669 Summary of Segments Banking by Line of Business Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfProductsAndServicesExplanatory
670 Summary of Geographical Segments Banking Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfGeographicalAreasExplanatory
671 033403 - Disclosure - Information on geographical areas (Tables) Network

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 http://www.ing.com/role/InformationOnGeographicalAreasTables
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674 Summary of Additional Information by Country Concept (Text Block (HTML)) For Period ing:DisclosureOfTaxCreditAdjustmentByGeographicalAreaExplanatory
675 033503 - Disclosure - Pension and other post-employment benefits (Tables) Network

*

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 http://www.ing.com/role/PensionAndOtherPostemploymentBenefitsTables
676 Implied Table Table

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677 Disclosure of net defined benefit liability (asset) [abstract] Abstract ifrs-full:DisclosureOfNetDefinedBenefitLiabilityAssetAbstract
678 Summary of Information on Plan Assets and Defined Benefit Obligation Per Country Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfNetDefinedBenefitLiabilityAssetExplanatory
679 Schedule of Changes in Fair Value of Plan Assets Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFairValueOfPlanAssetsExplanatory
680 Schedule of Changes in Present Value of Defined Benefit Obligation and Other Post-Employment Benefits Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfAdditionalInformationAboutDefinedBenefitPlansExplanatory
681 Amount Recognised Directly in Other Comprehensive Income (Equity) Concept (Text Block (HTML)) For Period ing:DisclosureOfAmountsRecognisedDirectlyInOtherComprehensiveIncomeEquityExplanatory
682 Summary of Pension and Other Staff-Related Benefit Costs Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDefinedBenefitPlansExplanatory
683 033603 - Disclosure - Taxation (Tables) Network

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 http://www.ing.com/role/TaxationTables
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686 Summary of Changes in Deferred Tax Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsExplanatory
687 Summary of Deferred Tax in Connection With Unused Tax Losses Carried Forward Concept (Text Block (HTML)) For Period ing:DisclosureOfDeferredTaxInConnectionWithUnusedTaxLossesCarriedForwardExplanatory
688 Summary of Total Unused Tax Losses Carried Forward Analysed by Expiry Terms Concept (Text Block (HTML)) For Period ing:DisclosureOfNetUnusedTaxLossesCarriedForwardAnalysedByExpiryTermsExplanatory
689 Summary of Deferred Tax Assets Concept (Text Block (HTML)) For Period ing:DisclosureOfNetDeferredTaxPositionExplanatory
690 Statement of Profit or Loss of Taxation Concept (Text Block (HTML)) For Period ing:DisclosureOfIncomeTaxBenefitsExpenseExplanatory
691 Reconciliation of Weighted Average Statutory Income Tax Rate To Effective Income Tax Rate Concept (Text Block (HTML)) For Period ing:DisclosureOfReconciliationOfAverageEffectiveTaxRateAndApplicableTaxRateExplanatory
692 Income Tax Related to Other Comprehensive Income Concept (Text Block (HTML)) For Period ing:DisclosureOfTaxEffectsOfComponentsOfOtherComprehensiveIncomeExplanatory
693 033703 - Disclosure - Fair value of assets and liabilities (Tables) Network

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694 Implied Table Table

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696 Summary of Financial Assets and Liabilities Concept (Text Block (HTML)) For Period ing:DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesExplanatory
697 Changes in Fair Value Hierarchy Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFairValueOfFinancialInstrumentsExplanatory
698 Changes in Level 3 Financial Assets Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFairValueMeasurementOfAssetsExplanatory
699 Changes in Level 3 Financial Liabilities Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFairValueMeasurementOfLiabilitiesExplanatory
700 Amounts Recognised in the Statement of Profit or Loss Concept (Text Block (HTML)) For Period ing:DisclosureOfAmountsRecognisedExplanatory
701 Valuation Techniques and Range of Unobservable Inputs Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsExplanatory
702 Fair Value of Sensitivity Analysis Instruments Concept (Text Block (HTML)) For Period ing:DisclosureOfFairValueFinancialSensitivityAnalysisExplanatory
703 Fair Value of Assets and Liabilities at Amortised Cost Concept (Text Block (HTML)) For Period ing:DisclosureOfFairValueFinancialAssetsAndLiabilitiesAmortisedCostExplanatory
704 033803 - Disclosure - Derivatives and hedge accounting (Tables) Network

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705 Disclosure of risk management strategy related to hedge accounting [table] Table

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712 Gross carrying value of derivatives Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutHedgingInstrumentsExplanatory
713 Maturity derivatives designated Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInformationAboutTermsAndConditionsOfHedgingInstrumentsAndHowTheyAffectFutureCashFlowsExplanatory
714 Hedged items included in a fair value hedging relationship Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutHedgedItemsExplanatory
715 Impact of hedging instruments on the statement of profit or loss and other comprehensive income Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInformationAboutAmountsThatAffectedStatementOfComprehensiveIncomeAsResultOfHedgeAccountingExplanatory
716 033813 - Disclosure - Structured entities (Tables) Network

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 http://www.ing.com/role/StructuredEntitiesTables
717 Implied Table Table

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719 Covered Bond Programme Concept (Text Block (HTML)) For Period ing:DisclosureOfCoveredBondProgrammeExplanatory
720 033903 - Disclosure - Assets by contractual maturity (Tables) Network

*

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 http://www.ing.com/role/AssetsByContractualMaturityTables
721 Implied Table Table

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 implied:Table
722 Assets by contractual maturity [abstract] Abstract ifrs-full:DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskAbstract
723 Summary of Assets By Contractual Maturity Concept (Text Block (HTML)) For Period ing:DisclosureOfContractualMaturityOfAssetsExplanatory
724 034003 - Disclosure - Liabilities by maturity (Tables) Network

*

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 http://www.ing.com/role/LiabilitiesByMaturityTables
725 Implied Table Table

*

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726 Disclosure of liabilities by maturity liquidity risk management [abstract] Abstract ing:DisclosureOfLiabilitiesByMaturityLiquidityRiskManagementAbstract
727 Schedule of Maturity of Financial And Non-Financial Liabilities Concept (Text Block (HTML)) For Period ing:DisclosureOfMaturityOfFinancialAndNonFinancialLiabilitiesExplanatory
728 034103 - Disclosure - Assets not freely disposable (Tables) Network

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 http://www.ing.com/role/AssetsNotFreelyDisposableTables
729 Implied Table Table

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732 034203 - Disclosure - Transfer of financial assets (Tables) Network

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 http://www.ing.com/role/TransferOfFinancialAssetsTables
733 Implied Table Table

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734 Disclosure of transferred financial assets that are not derecognised in their entirety [abstract] Abstract ifrs-full:DisclosureOfFinancialAssetsTransferredDuringPeriodWhichDoNotQualifyForDerecognitionAbstract
735 Schedule of Transfer of Financial Assets not Qualifying for Derecognition Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinancialAssetsTransferredDuringPeriodWhichDoNotQualifyForDerecognitionExplanatory
736 034303 - Disclosure - Offsetting financial assets and liabilities (Tables) Network

*

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 http://www.ing.com/role/OffsettingFinancialAssetsAndLiabilitiesTables
737 Implied Table Table

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740 Summary of Financial Liabilities Subject to Offsetting, Enforceable Master Netting Arrangements and Similar Agreements Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfReconciliationOfFinancialLiabilitiesSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreementsToIndividualLineItemsInStatementOfFinancialPositionExplanatory
741 034403 - Disclosure - Contingent liabilities and commitments (Tables) Network

*

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 http://www.ing.com/role/ContingentLiabilitiesAndCommitmentsTables
742 Implied Table Table

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 implied:Table
743 Disclosure of contingent liabilities [abstract] Abstract ifrs-full:DisclosureOfContingentLiabilitiesAbstract
744 Summary of Contingent Liabilities and Commitments Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCommitmentsAndContingentLiabilitiesExplanatory
745 Summary of Future Rental Commitments to be Paid Under Non-cancellable Operating Leases Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsExplanatory
746 034603 - Disclosure - Consolidated companies and business acquired and divested (Tables) Network

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 http://www.ing.com/role/ConsolidatedCompaniesAndBusinessAcquiredAndDivestedTables
747 Implied Table Table

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 implied:Table
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773 Cover values including guarantees received Concept (Text Block (HTML)) For Period ing:CountryRiskExposureCoverValuesIncludingGuaranteesReceivedExplanatory
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778 Provisions: ING Bank portfolio Concept (Text Block (HTML)) For Period ing:DisclosureOfChangesInProvisionExplanatory
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780 Summary Forborne assets Concept (Text Block (HTML)) For Period ing:DisclosureOfForborneAssetsExplanatory
781 Net Interest Income (NII) at Risk Concept (Text Block (HTML)) For Period ing:DisclosureOfNetInterestIncomeNiiAtRiskExplanatory
782 Net Present Value (NPV) at Risk Concept (Text Block (HTML)) For Period ing:DisclosureOfNpvatriskExplanatory
783 Basis Point Value (BPV) Concept (Text Block (HTML)) For Period ing:BasisPointExplanatory
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794 040000 - Disclosure - Reporting Entity - Additional Information (Detail) Network

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795 Implied Table Table

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800 040031 - Disclosure - Accounting Policies - Reconciliation Shareholders' Equity under IFRS-EU and IFRS-IASB (Detail) Network

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 http://www.ing.com/role/AccountingPoliciesReconciliationShareholdersEquityUnderIFRSEUAndIFRSIASBDetail
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805 Adjustment of the EU IAS 39 carve-out Concept (Monetary) As Of Debit ing:AdjustmentOfEUIAS39Carveout
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807 Effect of adjustment after tax Concept (Monetary) As Of Debit ing:EffectOfEUIAS39CarveoutAdjustmentAfterTax
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810 Non-controlling interests Concept (Monetary) As Of Credit ifrs-full:NoncontrollingInterests
811 In accordance with IFRS-IASB Total Equity Concept (Monetary) As Of Credit ifrs-full:Equity
812 040041 - Disclosure - Accounting Policies - Reconciliation Net Result under IFRS-EU and IFRS-IASB (Detail) Network

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 http://www.ing.com/role/AccountingPoliciesReconciliationNetResultUnderIFRSEUAndIFRSIASBDetail
813 Implied Table Table

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816 In accordance with IFRS-EU Concept (Monetary) For Period Credit ing:NetResultAttributableToOwnersOfParentEuIfrs
817 Adjustment of the EU IAS 39 carve-out Concept (Monetary) For Period Credit ing:ReconciliationNetResultAdjustmentOfEUIAS39Carveout
818 Tax effect of the adjustment Concept (Monetary) For Period Debit ing:ReconciliationNetResultTaxEffectOfAdjustment
819 Effect of adjustment after tax Concept (Monetary) For Period Credit ing:ReconciliationNetResultEffectOfAdjustmentAfterTaxEUIAS39Carveout
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823 040042 - Disclosure - Accounting Policies - Reconciliation of carrying amounts fin assets Liaiblties initial application of IFRS 9 (Detail) Network

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 http://www.ing.com/role/AccountingPoliciesReconciliationOfCarryingAmountsFinAssetsLiaibltiesInitialApplicationOfIFRS9Detail
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830 Non Trading Derivatives Assets [Member] Member ing:NonTradingDerivativesAssetsMember
831 Debt securities [member] Member ifrs-full:DebtSecuritiesMember
832 Loans And Advances [Member] Member ing:LoansAndAdvancesMember
833 Equity securities [member] Member ifrs-full:TradingEquitySecuritiesMember
834 Available-for-sale [member] Member ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
835 Securities at amortised cost [Member] Member ing:SecuritiesAtAmortisedCostMember
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840 Financial assets at fair value through other comprehensive income, category [member] Member ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember
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847 Customer Deposits [Member] Member ing:CustomerDepositsMember
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850 Debt securities in issue [Member] Member ing:DebtSecuritiesInIssueMember
851 Subordinated Loans [Member] Member ing:SubordinatedLoansMember
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861 Equity attributable to owners of parent [member] Member ifrs-full:EquityAttributableToOwnersOfParentMember
862 Non-controlling interests [member] Member ifrs-full:NoncontrollingInterestsMember
863 Disclosure of financial assets and liabilities at date of initial application of IFRS 9 [line items] LineItems ing:DisclosureOfFinancialAssetsAndLiabilitiesAtDateOfInitialApplicationOfIfrs9LineItems
864 Carrying amount IAS 39, financial assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsCarryingAmountImmediatelyBeforeInitialApplicationOfIFRS9
865 Reclassification, financial assets Concept (Monetary) As Of Debit ifrs-full:IncreaseDecreaseInFinancialAssetsOnBasisOfMeasurementCategoryFirstApplicationOfIFRS9
866 Remeasurement, financial assets Concept (Monetary) As Of Debit ifrs-full:IncreaseDecreaseInFinancialAssetsArisingFromChangeInMeasurementAttributeFirstApplicationOfIFRS9
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868 Carrying amount of liabilities IAS 39 Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesCarryingAmountImmediatelyBeforeInitialApplicationOfIFRS9
869 Reclassification, financial liabilties Concept (Monetary) As Of Credit ifrs-full:IncreaseDecreaseInFinancialLiabilitiesOnBasisOfMeasurementCategoryFirstApplicationOfIFRS9
870 Remeasurement, financial liabilities Concept (Monetary) As Of Credit ifrs-full:IncreaseDecreaseInFinancialLiabilitiesArisingFromChangeInMeasurementAttributeFirstApplicationOfIFRS9
871 Carrying amount of liabilities IFRS 9 Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesCarryingAmountImmediatelyAfterInitialApplicationOfIFRS9
872 Carrying amount IAS 39, equity Concept (Monetary) As Of Credit ing:EquityCarryingAmountImmediatelyBeforeInitialApplicationOfIfrs9
873 Remeasurement, equity Concept (Monetary) As Of Credit ing:IncreaseDecreaseInEquityArisingFromChangeInMeasurementAttributeInitialApplicationOfIfrs9
874 Carrying amount IFRS 9, equity Concept (Monetary) As Of Credit ing:EquityCarryingAmountImmediatelyAfterInitialApplicationOfIfrs9
875 Carrying amount, IAS 39 total equity and liabilities Concept (Monetary) As Of Credit ing:EquityAndLiabilitiesCarryingAmountImmediatelyBeforeInitialApplicationOfIfrs9
876 Reameasurement, equity and liabilities Concept (Monetary) As Of Credit ing:IncreaseDecreaseInEquityAndLiabilitiesArisingFromChangeInMeasurementAttributeInitialApplicationOfIfrs9
877 Carrying amount IFRS 9, total equity and liabilities Concept (Monetary) As Of Credit ing:EquityAndLiabilitiesCarryingAmountImmediatelyAfterInitialApplicationOfIfrs9
878 040043 - Disclosure - Accounting Policies - Reconciliation of carrying amounts fin assets AC initial application of IFRS 9 (Detail) Network

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 http://www.ing.com/role/AccountingPoliciesReconciliationOfCarryingAmountsFinAssetsACInitialApplicationOfIFRS9Detail
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886 Loans And Advances To Banks [Member] Member ing:LoansAndAdvancesToBanksMember
887 Securities at amortised cost [Member] Member ing:SecuritiesAtAmortisedCostMember
888 Loans and advances to customers [Member] Member ing:LoansAndAdvancesToCustomersMember
889 Other financial assets [Member] Member ing:OtherFinancialAssetsMember
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894 Currently stated [member] Member ifrs-full:RestatedMember
895 Increase (decrease) due to changes in accounting policy [member] Member ifrs-full:FinancialEffectOfChangesInAccountingPolicyMember
896 (To) / from Other Assets [member] Member ing:IncreaseDecreaseOtherAssetMember
897 (To)/ from Amortised cost [member] Member ing:IncreaseDecreaseSecuritiesAtAmortisedCostMember
898 (To) / from Loans and advances to banks [member] Member ing:IncreaseDecreaseLoansAndAdvancesToBanksMember
899 (To) / from Loans and advances to customers [member] Member ing:IncreaseDecreaseLoansAndAdvancesToCustomersMember
900 (To) / from Available for sale [member] Member ing:IncreaseDecreaseAvailableForSaleMember
901 (To) / from Financial assets at fair value through profit or loss [member] Member ing:IncreaseDecreaseFinancialAssetsAtFairValueThroughProfitOrLossMember
902 (To)/ from Financial assets at fair value through other comprehensive income [member] Member ing:IncreaseDecreaseFinancialAssetsAtFairValueThroughOtherComprehensiveIncomeMember
903 (To) / from Loans and advances from banks [member] Member ing:IncreaseDecreaseLoansAndAdvancesFromBanksMember
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905 Recognition of expected credit losses [Member] Member ing:RecognitionOfExpectedCreditLossesMember
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911 040044 - Disclosure - Accounting Policies - Reconciliation of carrying amounts fin assets FVPL initial application of IFRS 9 (Detail) Network

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912 Disclosure of financial assets at date of initial application of IFRS 9 [table] Table

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 ifrs-full:DisclosureOfFinancialAssetsAtDateOfInitialApplicationOfIFRS9Table
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927 (To) / from Trading assets [member] Member ing:IncreaseDecreaseTradingAssetsMember
928 (To) / from Loans and advances to customers [member] Member ing:IncreaseDecreaseLoansAndAdvancesToCustomersMember
929 (To) / from Available-for-sale [member] Member ing:IncreaseDecreaseSecuritiesAvailableForSaleMember
930 (To)/ from Amortised cost [member] Member ing:IncreaseDecreaseSecuritiesAtAmortisedCostMember
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936 040045 - Disclosure - Accounting Policies - Reconciliation of carrying amounts fin assets FVOCI initial application of IFRS 9 (Detail) Network

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 http://www.ing.com/role/AccountingPoliciesReconciliationOfCarryingAmountsFinAssetsFVOCIInitialApplicationOfIFRS9Detail
937 Disclosure of financial assets at date of initial application of IFRS 9 [table] Table

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 ifrs-full:DisclosureOfFinancialAssetsAtDateOfInitialApplicationOfIFRS9Table
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950 (To) / from Debt securities at FVOCI [Member] Member ing:IncreaseDecreaseDebtSecuritiesAtFvociMember
951 (To)/ from Equity securities at FVPL [member] Member ing:IncreaseDecreaseInEquitySecuritiesAtFvplMember
952 (To)/ from Amortised cost [member] Member ing:IncreaseDecreaseSecuritiesAtAmortisedCostMember
953 (To) / from Available-for-sale [member] Member ing:IncreaseDecreaseSecuritiesAvailableForSaleMember
954 (To) / from Loans and advances to customers [member] Member ing:IncreaseDecreaseLoansAndAdvancesToCustomersMember
955 (To) / from Other Assets [member] Member ing:IncreaseDecreaseOtherAssetMember
956 (To) / from Debt securities at FVPL [member] Member ing:IncreaseDecreaseDebtSecuritiesAtFVPLMember
957 Recognition of expected credit losses [Member] Member ing:RecognitionOfExpectedCreditLossesMember
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960 Reclassification, financial assets Concept (Monetary) As Of Debit ifrs-full:IncreaseDecreaseInFinancialAssetsOnBasisOfMeasurementCategoryFirstApplicationOfIFRS9
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962 Carrying amount of assets IFRS 9, financial assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsCarryingAmountImmediatelyAfterInitialApplicationOfIFRS9
963 040055 - Disclosure - Accounting Policies - Reconciliation of carrying amounts financial liabilities initial application of IFRS 9 (Detail) Network

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964 Disclosure of financial liabilities at date of initial application of IFRS 9 [table] Table

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 ifrs-full:DisclosureOfFinancialLiabilitiesAtDateOfInitialApplicationOfIFRS9Table
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967 Deposits from banks [member] Member ing:AmountsDueFromBanksMember
968 Customer Deposits [Member] Member ing:CustomerDepositsMember
969 Debt securities in issue [Member] Member ing:DebtSecuritiesInIssueMember
970 Subordinated Loans [Member] Member ing:SubordinatedLoansMember
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972 Liabilities [member] Member ifrs-full:LiabilitiesMember
973 Other liabilities, financial and non-financial [Member] Member ing:OtherLiabilitiesFinancialNonFinancialMember
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977 Disclosure of financial liabilities at date of initial application of IFRS 9 [line items] LineItems ifrs-full:DisclosureOfFinancialLiabilitiesAtDateOfInitialApplicationOfIFRS9LineItems
978 Carrying amount of liabilities IAS 39 Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesCarryingAmountImmediatelyBeforeInitialApplicationOfIFRS9
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980 Remeasurement, financial liabilities Concept (Monetary) As Of Credit ifrs-full:IncreaseDecreaseInFinancialLiabilitiesArisingFromChangeInMeasurementAttributeFirstApplicationOfIFRS9
981 Carrying amount IFRS 9, financial liabilities Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesCarryingAmountImmediatelyAfterInitialApplicationOfIFRS9
982 040065 - Disclosure - Accounting Policies - Reconciliation of carrying amounts financial liabilities FVPL initial application of IFRS 9 (Detail) Network

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983 Disclosure of financial liabilities at date of initial application of IFRS 9 [table] Table

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 ifrs-full:DisclosureOfFinancialLiabilitiesAtDateOfInitialApplicationOfIFRS9Table
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988 Categories of financial liabilities [axis] Axis ifrs-full:CategoriesOfFinancialLiabilitiesAxis
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990 Financial liabilities at fair value through profit or loss [member] Member ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember
991 Financial liabilities designated as at fair value through profit and loss [member] Member ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember
992 Retrospective application and retrospective restatement [axis] Axis ifrs-full:RetrospectiveApplicationAndRetrospectiveRestatementAxis
993 Increase (decrease) due to changes in accounting policy [member] Member ifrs-full:FinancialEffectOfChangesInAccountingPolicyMember
994 (To) / from Financial liabilities designated at FVPL [member] Member ing:IncreaseDecreaseInFinancialLiabilitiesDesignatedAtFvplMember
995 (To) / from Other liabilities [member] Member ing:IncreaseDecreaseOtherLiabilitiesMember
996 (To) / from Trading liabilities [member] Member ing:IncreaseDecreaseTradingLiabilitiesMember
997 Disclosure of financial liabilities at date of initial application of IFRS 9 [line items] LineItems ifrs-full:DisclosureOfFinancialLiabilitiesAtDateOfInitialApplicationOfIFRS9LineItems
998 Carrying amount of liabilities IAS 39 Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesCarryingAmountImmediatelyBeforeInitialApplicationOfIFRS9
999 Reclassification, financial liabilties Concept (Monetary) As Of Credit ifrs-full:IncreaseDecreaseInFinancialLiabilitiesOnBasisOfMeasurementCategoryFirstApplicationOfIFRS9
1000 Remeasurement, financial liabilities Concept (Monetary) As Of Credit ifrs-full:IncreaseDecreaseInFinancialLiabilitiesArisingFromChangeInMeasurementAttributeFirstApplicationOfIFRS9
1001 Carrying amount IFRS 9, financial liabilities Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesCarryingAmountImmediatelyAfterInitialApplicationOfIFRS9
1002 040067 - Disclosure - Accounting Policies - Classification and measurement of financial assets and financial liabilities on the date of initial application of IFRS 9 (Detail) Network

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 http://www.ing.com/role/AccountingPoliciesClassificationAndMeasurementOfFinancialAssetsAndFinancialLiabilitiesOnTheDateOfInitialApplicationOfIFRS9Detail
1003 Disclosure of financial assets and liabilities at date of initial application of IFRS 9 [table] Table

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 ing:DisclosureOfFinancialAssetsAndLiabilitiesAtDateOfInitialApplicationOfIfrs9Table
1004 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
1005 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
1006 Cash and balances with central banks [Member] Member ing:CashAndBalancesWithCentralBanksMember
1007 Loans And Advances To Banks [Member] Member ing:LoansAndAdvancesToBanksMember
1008 Trading assets [member] Member ifrs-full:TradingSecuritiesMember
1009 Non Trading Derivatives Assets [Member] Member ing:NonTradingDerivativesAssetsMember
1010 Debt securities [member] Member ifrs-full:DebtSecuritiesMember
1011 Loans And Advances [Member] Member ing:LoansAndAdvancesMember
1012 Equity securities [member] Member ifrs-full:TradingEquitySecuritiesMember
1013 Securities at amortised cost [Member] Member ing:SecuritiesAtAmortisedCostMember
1014 Loans and advances to customers [Member] Member ing:LoansAndAdvancesToCustomersMember
1015 Other financial assets [Member] Member ing:OtherFinancialAssetsMember
1016 Categories of financial assets [axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
1017 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
1018 Financial assets at fair value through profit or loss, category [member] Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember
1019 Held-to-maturity [member] Member ifrs-full:HeldtomaturityInvestmentsCategoryMember
1020 Mandatorily measured at fair value through profit or loss [member] Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossMandatorilyMeasuredAtFairValueCategoryMember
1021 Available-for-sale [member] Member ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
1022 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
1023 Assets [member] Member ifrs-full:ClassesOfAssetsMember
1024 Other assets [member] Member ifrs-full:OtherAssetsMember
1025 Classes of financial liabilities [axis] Axis ifrs-full:ClassesOfFinancialLiabilitiesAxis
1026 Financial liabilities, class [member] Member ifrs-full:FinancialLiabilitiesMember
1027 Deposits from banks [member] Member ing:AmountsDueFromBanksMember
1028 Customer Deposits [Member] Member ing:CustomerDepositsMember
1029 Trading Liabilities [Member] Member ing:TradingLiabilities1Member
1030 Non Trading Derivatives Liabilities [member] Member ing:NonTradingDerivativesLiabilitiesMember
1031 Debt securities in issue [Member] Member ing:DebtSecuritiesInIssueMember
1032 Subordinated Loans [Member] Member ing:SubordinatedLoansMember
1033 Other financial liabilities [Member] Member ing:OtherFinancialLiabilitiesMember
1034 Categories of financial liabilities [axis] Axis ifrs-full:CategoriesOfFinancialLiabilitiesAxis
1035 Financial liabilities, category [member] Member ifrs-full:FinancialLiabilitiesCategoryMember
1036 Financial liabilities at fair value through profit or loss [member] Member ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember
1037 Classes of liabilities [axis] Axis ifrs-full:ClassesOfLiabilitiesAxis
1038 Liabilities [member] Member ifrs-full:LiabilitiesMember
1039 Other liabilities [member] Member ing:OtherLiabilitiesFinancialNonFinancialMember
1040 Disclosure of financial assets and liabilities at date of initial application of IFRS 9 [line items] LineItems ing:DisclosureOfFinancialAssetsAndLiabilitiesAtDateOfInitialApplicationOfIfrs9LineItems
1041 Disclosure of financial assets at date of initial application of IFRS 9 [abstract] Abstract ifrs-full:DisclosureOfFinancialAssetsAtDateOfInitialApplicationOfIFRS9Abstract
1042 Original measurement under IAS 39, financial assets Concept (Text/String) For Period ifrs-full:FinancialAssetsMeasurementCategoryImmediatelyBeforeInitialApplicationOfIFRS9
1043 Original carrying amount under IAS 39, financial assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsCarryingAmountImmediatelyBeforeInitialApplicationOfIFRS9
1044 Carrying amount of assets IFRS 9 Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsCarryingAmountImmediatelyAfterInitialApplicationOfIFRS9
1045 New measurement under IFRS 9, financial assets Concept (Text/String) For Period ifrs-full:FinancialAssetsMeasurementCategoryImmediatelyAfterInitialApplicationOfIFRS9
1046 Disclosure of financial liabilities at date of initial application of IFRS 9 [abstract] Abstract ifrs-full:DisclosureOfFinancialLiabilitiesAtDateOfInitialApplicationOfIFRS9Abstract
1047 Orignal measurement under IAS 39, financial liabilties Concept (Text/String) For Period ifrs-full:FinancialLiabilitiesMeasurementCategoryImmediatelyBeforeInitialApplicationOfIFRS9
1048 Original carrying amount under IAS 39, financial liabilities Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesCarryingAmountImmediatelyBeforeInitialApplicationOfIFRS9
1049 Carrying amount IFRS 9, financial liabilities Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesCarryingAmountImmediatelyAfterInitialApplicationOfIFRS9
1050 New measurement IFRS 9, financial liabilities Concept (Text/String) For Period ifrs-full:FinancialLiabilitiesMeasurementCategoryImmediatelyAfterInitialApplicationOfIFRS9
1051 040075 - Disclosure - Accounting Policies - Reconciliation of Impairment Allowance in Accordance with IAS 39 to Opening ECL Allowance in Accordance with IFRS 9 (Detail) Network

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 http://www.ing.com/role/AccountingPoliciesReconciliationOfImpairmentAllowanceInAccordanceWithIAS39ToOpeningECLAllowanceInAccordanceWithIFRS9Detail
1052 Disclosure of financial assets at date of initial application of IFRS 9 [table] Table

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 ifrs-full:DisclosureOfFinancialAssetsAtDateOfInitialApplicationOfIFRS9Table
1053 Impairment of financial assets [axis] Axis ifrs-full:ImpairmentOfFinancialAssetsAxis
1054 Entity's total for impairment of financial assets [member] Member ifrs-full:EntitysTotalForImpairmentOfFinancialAssetsMember
1055 Financial Assets Impaired [member] Member ifrs-full:FinancialAssetsImpairedMember
1056 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
1057 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
1058 Loans and advances to banks [member] Member ing:LoansAndAdvancesToBanksMember
1059 Available-for-sale or Held-to-maturity debt investment securities [Member] Member ing:AvailableForSaleheldToMaturityDebtInvestmentSecuritiesMember
1060 Loans and advances to customers [Member] Member ing:LoansAndAdvancesToCustomersMember
1061 Available-for-sale debt securities [Member] Member ing:AvailableForSaleDebtSecuritiesMember
1062 Loan commitments and financial guarantee contracts issued [Member] Member ing:LoanCommitmentsAndFinancialGuaranteeContractsIssuedMember
1063 Categories of financial assets [axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
1064 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
1065 Financial assets at fair value through other comprehensive income, category [member] Member ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember
1066 Held-to-maturity investments, category [member] Member ifrs-full:HeldtomaturityInvestmentsCategoryMember
1067 Financial assets at amortised cost, category [member] Member ifrs-full:FinancialAssetsAtAmortisedCostCategoryMember
1068 Disclosure of financial assets at date of initial application of IFRS 9 [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsAtDateOfInitialApplicationOfIFRS9LineItems
1069 Carrying amount IAS 39, financial assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsCarryingAmountImmediatelyBeforeInitialApplicationOfIFRS9
1070 Reclassification, financial assets Concept (Monetary) As Of Debit ifrs-full:IncreaseDecreaseInFinancialAssetsOnBasisOfMeasurementCategoryFirstApplicationOfIFRS9
1071 Remeasurement, financial assets Concept (Monetary) As Of Debit ifrs-full:IncreaseDecreaseInFinancialAssetsArisingFromChangeInMeasurementAttributeFirstApplicationOfIFRS9
1072 Carrying amount of assets IFRS 9, financial assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsCarryingAmountImmediatelyAfterInitialApplicationOfIFRS9
1073 040080 - Disclosure - Accounting Policies - Expected credit losses loans and advances per stage at Jan 1 2018 (Details) Network

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*

 http://www.ing.com/role/AccountingPoliciesExpectedCreditLossesLoansAndAdvancesPerStageAtJan12018Details
1074 Disclosure of financial assets [table] Table

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*

 ifrs-full:DisclosureOfFinancialAssetsTable
1075 Type of measurement of expected credit losses [axis] Axis ifrs-full:TypeOfMeasurementOfExpectedCreditLossesAxis
1076 Type of measurement of expected credit losses [member] Member ifrs-full:TypeOfMeasurementOfExpectedCreditLossesMember
1077 Stage 1: 12-month expected credit losses [member] Member ifrs-full:TwelvemonthExpectedCreditLossesMember
1078 Stage 2: Lifetime expected credit losses [member] Member ifrs-full:LifetimeExpectedCreditLossesMember
1079 Stage 3: Lifetime Expected Credit Losses [member] Member ing:StageThreeLifetimeExpectedCreditLossesMember
1080 Initially applied IFRSs [axis] Axis ifrs-full:InitiallyAppliedIFRSsAxis
1081 Initially applied IFRSs [member] Member ifrs-full:InitiallyAppliedIFRSsMember
1082 In accordance with IFRS 9 [member] Member ifrs-full:InAccordanceWithIFRS9Member
1083 Disclosure of financial assets [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsLineItems
1084 Loans and advances to customers Concept (Monetary) As Of Debit ifrs-full:LoansAndAdvancesToCustomers
1085 Expected credit losses Concept (Monetary) As Of Credit ifrs-full:ExposureToCreditRiskOnLoanCommitmentsAndFinancialGuaranteeContracts
1086 040085 - Disclosure - Accounting Policies - Estimated IFRS 9 transition impact impairments as at 1 January 2018 (Detail) Network

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 http://www.ing.com/role/AccountingPoliciesEstimatedIFRS9TransitionImpactImpairmentsAsAt1January2018Detail
1087 Disclosure of financial assets at date of initial application of IFRS 9 [table] Table

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*

 ifrs-full:DisclosureOfFinancialAssetsAtDateOfInitialApplicationOfIFRS9Table
1088 Impairment of financial assets [axis] Axis ifrs-full:ImpairmentOfFinancialAssetsAxis
1089 Entity's total for impairment of financial assets [member] Member ifrs-full:EntitysTotalForImpairmentOfFinancialAssetsMember
1090 Financial Assets Impaired [member] Member ifrs-full:FinancialAssetsImpairedMember
1091 Type of measurement of expected credit losses [axis] Axis ifrs-full:TypeOfMeasurementOfExpectedCreditLossesAxis
1092 Type of measurement of expected credit losses [member] Member ifrs-full:TypeOfMeasurementOfExpectedCreditLossesMember
1093 Stage 1: 12-month expected credit losses [member] Member ifrs-full:TwelvemonthExpectedCreditLossesMember
1094 Stage 2: Lifetime expected credit losses [member] Member ifrs-full:LifetimeExpectedCreditLossesMember
1095 Stage 3: Lifetime Expected Credit Losses [member] Member ing:StageThreeLifetimeExpectedCreditLossesMember
1096 ECL [member] Member ing:ExpectedCreditLossesMember
1097 Method of assessment of expected credit losses [axis] Axis ifrs-full:MethodOfAssessmentOfExpectedCreditLossesAxis
1098 Method of assessment of expected credit losses [member] Member ifrs-full:MethodOfAssessmentOfExpectedCreditLossesMember
1099 Incurred but Not Reported [Member] Member ing:IncurredButNotReportedMember
1100 Individual Provisions [Member] Member ing:IndividualProvisionsMember
1101 Disclosure of financial assets at date of initial application of IFRS 9 [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsAtDateOfInitialApplicationOfIFRS9LineItems
1102 Carrying amount IAS 39, financial assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsCarryingAmountImmediatelyBeforeInitialApplicationOfIFRS9
1103 Remeasurement, financial assets Concept (Monetary) As Of Debit ifrs-full:IncreaseDecreaseInFinancialAssetsArisingFromChangeInMeasurementAttributeFirstApplicationOfIFRS9
1104 Carrying amount of assets IFRS 9, financial assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsCarryingAmountImmediatelyAfterInitialApplicationOfIFRS9
1105 040095 - Disclosure - Accounting Policies - Impact (net of tax) of transition to IFRS 9 on reserves and retained earnings (Detail) Network

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 http://www.ing.com/role/AccountingPoliciesImpactnetOfTaxOfTransitionToIFRS9OnReservesAndRetainedEarningsDetail
1106 Disclosure of reserves within equity [table] Table

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*

 ifrs-full:DisclosureOfReservesWithinEquityTable
1107 Initially applied IFRSs [axis] Axis ifrs-full:InitiallyAppliedIFRSsAxis
1108 Initially applied IFRSs [member] Member ifrs-full:InitiallyAppliedIFRSsMember
1109 In accordance with IFRS 9 [member] Member ifrs-full:InAccordanceWithIFRS9Member
1110 Disclosure of reserves within equity [Line Items] LineItems ifrs-full:DisclosureOfReservesWithinEquityLineItems
1111 Liability credit reserve, opening balance Concept (Monetary) As Of Credit ifrs-full:ReserveOfChangeInFairValueOfFinancialLiabilityAttributableToChangeInCreditRiskOfLiability
1112 Reclassification of credit risk for financial liabilities designated as at FVTPL Concept (Monetary) For Period Credit ing:ReclassificationOfCreditRiskForFinancialLiabilitiesDesignatedAsAtFvtpl
1113 Liability credit reserve, closing balance Concept (Monetary) As Of Credit ifrs-full:ReserveOfChangeInFairValueOfFinancialLiabilityAttributableToChangeInCreditRiskOfLiability
1114 Fair value reserve, opening balance Concept (Monetary) As Of Credit ing:FairValueReserve
1115 Reclassification of investment securities (debt) from available-for-sale to amortised cost Concept (Monetary) For Period Credit ing:ReclassificationOfInvestmentSecuritiesDebtFromAvailableForSaleToAmortisedCost
1116 Reclassification of investment securities (equity) from available-for-sale to FVTPL Concept (Monetary) For Period Credit ing:ReclassificationOfInvestmentSecuritiesEquityFromAvailableForSaleToFvtpl
1117 Reclassification of loans and advances to debt instruments at FVOCI Concept (Monetary) For Period Credit ing:ReclassificationOfLoansAndAdvancesToDebtInstrumentsAtFvoci
1118 Fair value reserve, closing balance Concept (Monetary) As Of Credit ing:FairValueReserve
1119 Share of associates, joint ventures and other reserves, opening balance Concept (Monetary) As Of Credit ing:ReserveFromShareOfChangesInEquitiesOfAssociatesAndJointVenture
1120 Impact of application of IFRS 9 Concept (Monetary) For Period Credit ing:ImpactOfApplicationOfIfrs9
1121 Share of associates, joint ventures and other reserves, closing balance Concept (Monetary) As Of Credit ing:ReserveFromShareOfChangesInEquitiesOfAssociatesAndJointVenture
1122 Retained earnings, opening balance Concept (Monetary) As Of Credit ifrs-full:RetainedEarnings
1123 Reclassificaiton under IFRS 9 Concept (Monetary) For Period Credit ing:ReclassificaitonUnderIfrs9
1124 Recognition of expected credit losses under IFRS 9 (including lease receivables, loan commitments and financial guarantee contracts) Concept (Monetary) For Period Credit ing:RecognitionOfExpectedCreditLossesUnderIFRS9
1125 Retained earings, closing balance Concept (Monetary) As Of Credit ifrs-full:RetainedEarnings
1126 040096 - Disclosure - Accounting Policies - Summary of Estimated impact of adopting IFRS 9 on shareholders' equity as at 1 January 2018 (Detail) Network

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 http://www.ing.com/role/AccountingPoliciesSummaryOfEstimatedImpactOfAdoptingIFRS9OnShareholdersEquityAsAt1January2018Detail
1127 Disclosure of expected impact of initial application of new standards or interpretations [table] Table

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 ifrs-full:DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsTable
1128 Initially applied IFRSs [axis] Axis ifrs-full:InitiallyAppliedIFRSsAxis
1129 Initially applied IFRSs [member] Member ifrs-full:InitiallyAppliedIFRSsMember
1130 In accordance with IFRS 9 [member] Member ifrs-full:InAccordanceWithIFRS9Member
1131 Disclosure of expected impact of initial application of new standards or interpretations [line items] LineItems ifrs-full:DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsLineItems
1132 Loan loss provisions1 Concept (Monetary) For Period Debit ing:EstimatedImpactOfAdoptingIFRS9NetOfTaxOnShareholdersEquityLLP
1133 Investment portfolio2 Concept (Monetary) For Period Debit ing:EstimatedImpactOfAdoptingIFRS9NetOfTaxOnShareholdersEquityInvestmentPortfolio
1134 Mortgages held in HtC&S portfolio3 Concept (Monetary) For Period Credit ing:EstimatedImpactOfAdoptingIFRS9NetOfTaxOnShareholdersEquityMortgagesInHtCAndSPortfolio
1135 Other4 Concept (Monetary) For Period Debit ing:EstimatedImpactOfAdoptingIFRS9NetOfTaxOnShareholdersEquityOther
1136 Total Estimated impact of adopting IFRS 9 on shareholders' equity as at 1 January 2018 Concept (Monetary) For Period Debit ing:TotalEstimatedImpactOfAdoptingIFRS9NetOfTaxOnShareholdersEquity
1137 Percentage of impact on fully loaded CET 1 ratio Concept (Percent) As Of ing:PercentageOfImpactOnFullyLoadedCet1
1138 040097 - Disclosure - Accounting Policies - Additional Information (Detail) Network

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*

 http://www.ing.com/role/AccountingPoliciesAdditionalInformationDetail
1139 Disclosure of significant accounting policies [table] Table

*

*

 ing:DisclosureOfSignificantAccountingPoliciesTable
1140 Initially applied IFRSs [axis] Axis ifrs-full:InitiallyAppliedIFRSsAxis
1141 Initially applied IFRSs [member] Member ifrs-full:InitiallyAppliedIFRSsMember
1142 In accordance with IFRS 9 [member] Member ifrs-full:InAccordanceWithIFRS9Member
1143 Categories of financial assets [axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
1144 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
1145 Available-for-sale [member] Member ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
1146 Loans and receivables [member] Member ifrs-full:LoansAndReceivablesCategoryMember
1147 Financial assets available-for-sale and loans, category [member] Member ing:FinancialAssetsAvailableforsaleAndLoansCategoryMember
1148 Equity securities at fair value through other comprehensive income [member] Member ifrs-full:InvestmentsInEquityInstrumentsMeasuredAtFairValueThroughOtherComprehensiveIncomeMember
1149 Repurchase Agreement [member] Member ing:RepurchaseAgreementMember
1150 Deferred and current tax assets [Member] Member ing:DeferredAndCurrentTaxAssetsMember
1151 Associates [member] Member ing:OtherInvestmentsInAssociatesAndJointVenturesMember
1152 Capital requirements [axis] Axis ifrs-full:CapitalRequirementsAxis
1153 Capital Requirements [Member] Member ifrs-full:CapitalRequirementsMember
1154 Shareholders' Equity 1 [Member] Member ing:ShareholdersEquity1Member
1155 Impairment of financial assets [axis] Axis ifrs-full:ImpairmentOfFinancialAssetsAxis
1156 Entity's total for impairment of financial assets [member] Member ifrs-full:EntitysTotalForImpairmentOfFinancialAssetsMember
1157 Financial Assets Impaired [member] Member ifrs-full:FinancialAssetsImpairedMember
1158 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
1159 Property, plant and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
1160 Land and buildings held for own use [member] Member ifrs-full:LandAndBuildingsMember
1161 Fixtures and fittings [member] Member ifrs-full:FixturesAndFittingsMember
1162 Data processing equipment [member] Member us-gaap:ComputerEquipmentMember
1163 Classes of liabilities [axis] Axis ifrs-full:ClassesOfLiabilitiesAxis
1164 Liabilities [member] Member ifrs-full:LiabilitiesMember
1165 Other liabilities [member] Member ing:OtherLiabilitiesFinancialNonFinancialMember
1166 Provision on off balance sheet positions [Member] Member ing:ProvisionOnOffBalanceSheetPositionsMember
1167 Deferred and current tax liabilities [Member] Member ing:DeferredAndCurrentTaxLiabilitiesMember
1168 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
1169 Assets [member] Member ifrs-full:ClassesOfAssetsMember
1170 Other assets [member] Member ifrs-full:OtherAssetsMember
1171 Disclosure of significant accounting policies [line items] LineItems ing:DisclosureOfSignificantAccountingPoliciesLineItems
1172 Right of use Assets, IFRS 16 (Assets) Concept (Monetary) As Of Debit ifrs-full:RightofuseAssets
1173 Lease Liabilities per IFRS 16 (liabilities) Concept (Monetary) As Of Credit ifrs-full:LeaseLiabilities
1174 Description of prepayment penalty cap Concept (Text/String) For Period ing:SPPIDescriptionOfPrepaymentPenaltyCapIFRS9from1Jan2018
1175 Description of leverage feature Concept (Text/String) For Period ing:SPPIDescriptionOfLeverageFeatureIFRS9from1Jan2018
1176 Description of interest rate that modifies consideration for time value of money Concept (Text/String) For Period ing:SPPIDescriptionOfInterestRateThatModifiesConsiderationForTimeValueOfMoneyIFRS9from1Jan2018
1177 Useful lives or depreciation rates, property, plant and equipment Concept (Text/String) For Period ifrs-full:UsefulLivesOrDepreciationRatesPropertyPlantAndEquipment
1178 Remeasurement impact Concept (Monetary) As Of Credit ing:RemeansurementImpactAssetsLiabilitiesIfrs9
1179 Remeasurement, financial assets Concept (Monetary) As Of Debit ifrs-full:IncreaseDecreaseInFinancialAssetsArisingFromChangeInMeasurementAttributeFirstApplicationOfIFRS9
1180 Remeasurement, financial liabilities Concept (Monetary) As Of Credit ifrs-full:IncreaseDecreaseInFinancialLiabilitiesArisingFromChangeInMeasurementAttributeFirstApplicationOfIFRS9
1181 Amount reclassified within equity from Retained earnings to OCI Concept (Monetary) For Period Debit ing:AmountReclassifiedWithinEquityForCreditRiskOnFinancialLiabilitiesAtFVTPL
1182 Part of AFS investment portfolio reclassified to amortised cost Concept (Monetary) For Period Debit ing:InvestmentPortfolioReclassifiedToAmortisedCost
1183 Part of AFS investment portfolio reclassified to amortised cost - reduction of unrealised revaluation gains in equity Concept (Monetary) For Period Debit ing:InvestmentPortfolioReclassifiedToAmortisedCostReductionOfUnrealisedRevaluationGainsInEquity
1184 Reclassification of part of mortgage portfolio from amortised cost to FVOCI Concept (Monetary) For Period Debit ing:ReclassificationOfPartOfMortgagePortfolioFromAmortisedCostToFVOCI
1185 Reclassification of part of mortgage portfolio from amortised cost to FVOCI increase in equity Concept (Monetary) For Period Debit ing:ReclassificationOfPartOfMortgagePortfolioFromAmortisedCostToFVOCIIncreaseInEquity
1186 Debt securities and loans reclassified from amortised cost or AFS to FVPL - SPPI failures Concept (Monetary) For Period Debit ing:DebtSecuritiesAndLoansReclassifiedFromAmortisedCostOrAFSToFVPLSPPIFailures
1187 Investment in equity securities Concept (Monetary) As Of Debit ing:InvestmentsInEquitySecurities
1188 Certain reverse repurchase portfolios - FV option for related repurchase financial liabilities Concept (Monetary) As Of Credit ing:CertainReverseRepurchasePortfoliosFairValueOptionForRelatedRepurchaseFinancialLiabilities
1189 Stage 3 assets the PD Concept (Percent) For Period ing:PdForStageThree
1190 Total Estimated impact of adopting IFRS 9 on shareholders' equity as at 1 January 2018 Concept (Monetary) For Period Debit ing:TotalEstimatedImpactOfAdoptingIFRS9NetOfTaxOnShareholdersEquity
1191 Total Estimated impact of adopting IFRS 9 on CET1 capital ratio as at 1 January 2018 Concept (Percent) For Period ing:TotalEstimatedImpactOfAdoptingIFRS9OnCommonEquityTierOneCapitalRatio
1192 Significant decline in fair value trigger Concept (Percent) For Period ing:SignificantDeclineInFvTrigger
1193 Prolonged decline in fair value trigger Concept (Text/String) For Period ing:ProlongedDeclineInFvTrigger
1194 Description of significant influence in associates and joint ventures (% voting rights) Concept (Percent) For Period ing:DescriptionOfSignificantInfluenceInAssociatesAndJointVenturesVotingRights
1195 040201 - Disclosure - Cash and Balances with Central Banks - Summary of Cash and Balances with Central Banks (Detail) Network

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 http://www.ing.com/role/CashAndBalancesWithCentralBanksSummaryOfCashAndBalancesWithCentralBanksDetail
1196 Implied Table Table

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*

 implied:Table
1197 Cash and balances with central banks [abstract] Abstract ing:CashAndBalancesWithCentralBanksAbstract
1198 Amounts held at central banks Concept (Monetary) As Of Debit ifrs-full:MandatoryReserveDepositsAtCentralBanks
1199 Cash and bank balances Concept (Monetary) As Of Debit ifrs-full:BankBalancesAtCentralBanksOtherThanMandatoryReserveDeposits
1200 Cash and balances with central banks Concept (Monetary) As Of Debit ifrs-full:CashAndBankBalancesAtCentralBanks
1201 040301 - Disclosure - Loans and Advances to Banks - Schedule of Loans and Advances to Banks (Detail) Network

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 http://www.ing.com/role/LoansAndAdvancesToBanksScheduleOfLoansAndAdvancesToBanksDetail
1202 Disclosure Of Loans And Advances To Banks [Table] Table

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 ing:DisclosureOfLoansAndAdvancesToBanksTable
1203 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
1204 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
1205 Netherlands [member] Member ifrs-full:CountryOfDomicileMember
1206 International [member] Member ifrs-full:ForeignCountriesMember
1207 Disclosure Of Loans And Advances To Banks [Line Items] LineItems ing:DisclosureOfLoansAndAdvancesToBanksLineItems
1208 Loans Concept (Monetary) As Of Debit ing:LoansToBanks
1209 Cash advances, overdrafts and other balances Concept (Monetary) As Of Debit ing:CashAdvancesOverdraftsAndOtherBalances
1210 Loans and advances to banks gross Concept (Monetary) As Of Debit ing:LoansAndAdvancesToBanksGross
1211 Loan loss provisions Concept (Monetary) As Of Credit ing:LossOnProvisionsForLoansToBanks
1212 Loans and advances to banks Concept (Monetary) As Of Debit ifrs-full:LoansAndAdvancesToBanks
1213 040302 - Disclosure - Loans and Advances to Banks - Additional Information (Detail) Network

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 http://www.ing.com/role/LoansAndAdvancesToBanksAdditionalInformationDetail
1214 Disclosure Of Loans And Advances To Banks [Table] Table

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 ing:DisclosureOfLoansAndAdvancesToBanksTable
1215 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
1216 Financial instruments, class [member] Member ifrs-full:ClassesOfFinancialInstrumentsMember
1217 Receivables related to securities in reverse repurchase transactions [member] Member ing:SecuritiesInReverseRepurchaseTransactionMember
1218 Receivables related to finance lease contracts [member] Member ifrs-full:LeaseReceivablesMember
1219 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
1220 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
1221 Non-subordinate receivables [member] Member ing:NonsubordinateReceivablesMember
1222 Subordinated receivables [member] Member ing:SubordinateReceivablesMember
1223 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
1224 Risks [member] Member ifrs-full:TypesOfRisksMember
1225 Risk management [member] Member ing:RiskManagementMember
1226 Disclosure Of Loans And Advances To Banks [Line Items] LineItems ing:DisclosureOfLoansAndAdvancesToBanksLineItems
1227 Short-term deposits with central banks Concept (Monetary) As Of Debit ifrs-full:ShorttermDepositsClassifiedAsCashEquivalents
1228 Loans to banks Concept (Monetary) As Of Debit ing:LoansToBanks
1229 Loans and advances to banks Concept (Monetary) As Of Debit ifrs-full:LoansAndAdvancesToBanks
1230 040401 - Disclosure - Financial Assets at Fair Value through Profit or Loss - Summary of Financial Assets at Fair Value through Profit or Loss (Detail) Network

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 http://www.ing.com/role/FinancialAssetsAtFairValueThroughProfitOrLossSummaryOfFinancialAssetsAtFairValueThroughProfitOrLossDetail
1231 Implied Table Table

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*

 implied:Table
1232 Disclosure of fair value measurement of assets [abstract] Abstract ifrs-full:DisclosureOfFairValueMeasurementOfAssetsAbstract
1233 Trading assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTrading
1234 Non-trading derivatives Concept (Monetary) As Of Debit ifrs-full:CreditDerivativeFairValue
1235 Designated as at fair value through profit or loss Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossDesignatedAsUponInitialRecognition
1236 - mandatorily at fair value through profit or loss Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossMandatorilyMeasuredAtFairValue
1237 Financial assets at fair value through profit or loss Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLoss
1238 040402 - Disclosure - Financial Assets at Fair Value through Profit or Loss - Summary of Trading Assets (Detail) Network

*

*

 http://www.ing.com/role/FinancialAssetsAtFairValueThroughProfitOrLossSummaryOfTradingAssetsDetail
1239 Disclosure of fair value measurement of assets [table] Table

*

*

 ifrs-full:DisclosureOfFairValueMeasurementOfAssetsTable
1240 Categories of financial assets [axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
1241 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
1242 Loans and receivables [member] Member ifrs-full:LoansAndReceivablesCategoryMember
1243 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
1244 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
1245 Equity securities [member] Member ifrs-full:EquityInvestmentsMember
1246 Derivatives [member] Member ifrs-full:DerivativesMember
1247 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
1248 Assets [member] Member ifrs-full:ClassesOfAssetsMember
1249 Debt securities [member] Member ifrs-full:DebtSecuritiesMember
1250 Disclosure of fair value measurement of assets [line items] LineItems ifrs-full:DisclosureOfFairValueMeasurementOfAssetsLineItems
1251 Trading assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTrading
1252 040403 - Disclosure - Financial Assets at Fair Value through Profit or Loss - Summary of Non-Trading Derivatives (Detail) Network

*

*

 http://www.ing.com/role/FinancialAssetsAtFairValueThroughProfitOrLossSummaryOfNonTradingDerivativesDetail
1253 Disclosure of fair value measurement of assets [table] Table

*

*

 ifrs-full:DisclosureOfFairValueMeasurementOfAssetsTable
1254 Types of hedges [axis] Axis ifrs-full:TypesOfHedgesAxis
1255 Hedges [member] Member ifrs-full:TypesOfHedgesMember
1256 Fair value hedges [member] Member ifrs-full:FairValueHedgesMember
1257 Cash flow hedges [member] Member ifrs-full:CashFlowHedgesMember
1258 Hedges of net investments in foreign operations [member] Member ifrs-full:HedgesOfNetInvestmentInForeignOperationsMember
1259 Other non-trading derivatives [member] Member ing:OtherNontradingDerivativesMember
1260 Categories of financial assets [axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
1261 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
1262 Non-trading Derivative [Member] Member ing:NonTradingDerivativeMember
1263 Disclosure of fair value measurement of assets [line items] LineItems ifrs-full:DisclosureOfFairValueMeasurementOfAssetsLineItems
1264 Financial assets, at fair value Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValue
1265 040404 - Disclosure - Financial Assets at Fair Value through Profit or Loss - Designated as at Fair Value Through Profit or Loss (Detail) Network

*

*

 http://www.ing.com/role/FinancialAssetsAtFairValueThroughProfitOrLossDesignatedAsAtFairValueThroughProfitOrLossDetail
1266 Disclosure of fair value measurement of assets [table] Table

*

*

 ifrs-full:DisclosureOfFairValueMeasurementOfAssetsTable
1267 Categories of financial assets [axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
1268 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
1269 Loans and receivables [member] Member ifrs-full:LoansAndReceivablesCategoryMember
1270 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
1271 Assets [member] Member ifrs-full:ClassesOfAssetsMember
1272 Equity securities [member] Member ifrs-full:TradingEquitySecuritiesMember
1273 Debt securities [member] Member ifrs-full:DebtSecuritiesMember
1274 Disclosure of fair value measurement of assets [line items] LineItems ifrs-full:DisclosureOfFairValueMeasurementOfAssetsLineItems
1275 Designated as at fair value through profit or loss Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossDesignatedAsUponInitialRecognition
1276 040405 - Disclosure - Financial Assets at Fair Value through Profit or Loss - Mandatorily at fair value through profit or loss by type (Detail) Network

*

*

 http://www.ing.com/role/FinancialAssetsAtFairValueThroughProfitOrLossMandatorilyAtFairValueThroughProfitOrLossByTypeDetail
1277 Disclosure of fair value measurement of assets [table] Table

*

*

 ifrs-full:DisclosureOfFairValueMeasurementOfAssetsTable
1278 Categories of financial assets [axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
1279 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
1280 Loans and receivables [member] Member ifrs-full:LoansAndReceivablesCategoryMember
1281 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
1282 Assets [member] Member ifrs-full:ClassesOfAssetsMember
1283 Equity securities [member] Member ifrs-full:TradingEquitySecuritiesMember
1284 Debt securities [member] Member ifrs-full:DebtSecuritiesMember
1285 Disclosure of fair value measurement of assets [line items] LineItems ifrs-full:DisclosureOfFairValueMeasurementOfAssetsLineItems
1286 Financial assets mandatorily measured at fair value through profit or loss Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossMandatorilyMeasuredAtFairValue
1287 040406 - Disclosure - Financial Assets at Fair Value Through Profit or Loss - Additional Information (Detail) Network

*

*

 http://www.ing.com/role/FinancialAssetsAtFairValueThroughProfitOrLossAdditionalInformationDetail
1288 Disclosure of fair value measurement of assets [table] Table

*

*

 ifrs-full:DisclosureOfFairValueMeasurementOfAssetsTable
1289 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
1290 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
1291 NN Group N.V. [member] Member ing:NNGroupNVMember
1292 Voya Financial Inc., divestment [member] Member ing:VoyaFinancialIncMember
1293 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
1294 Financial instruments, class [member] Member ifrs-full:ClassesOfFinancialInstrumentsMember
1295 Trading assets [member] Member ing:TradingAssetsMember
1296 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
1297 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
1298 Credit Derivative [member] Member ing:CreditDerivativeMember
1299 Categories of financial assets [axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
1300 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
1301 Loans and receivables [member] Member ifrs-full:LoansAndReceivablesCategoryMember
1302 Mandatorily measured at fair value through profit or loss [member] Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossMandatorilyMeasuredAtFairValueCategoryMember
1303 Disclosure of fair value measurement of assets [line items] LineItems ifrs-full:DisclosureOfFairValueMeasurementOfAssetsLineItems
1304 Reverse repurchase agreements Concept (Monetary) As Of Debit ifrs-full:ReverseRepurchaseAgreementsAndCashCollateralOnSecuritiesBorrowed
1305 Financial liabilities designated as at fair value through profit or loss Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedAsUponInitialRecognition
1306 Warrants held for number of shares Concept (Shares) As Of ing:WarrantsHeldForNumberOfShares
1307 Amount of warrants hold for shares included in other non-trading derivatives Concept (Monetary) As Of Debit ing:AmountOfWarrantsHeldForSharesIncludedInOtherNontradingDerivatives
1308 Warrants sold Concept (Shares) For Period ing:NumberOfWarrantsSold
1309 Notional value of the related credit derivatives Concept (Monetary) As Of invest:DerivativeNotionalAmount
1310 Amount of change in fair value of the credit derivatives attributable to changes in credit risks Concept (Monetary) As Of Debit ifrs-full:AccumulatedChangesInFairValueOfFinancialAssetsAttributableToChangesInCreditRiskOfFinancialAssets
1311 Change in fair value of the credit derivatives for the current year Concept (Monetary) For Period Debit ifrs-full:ChangesInFairValueOfFinancialAssetsAttributableToChangesInCreditRiskOfFinancialAssets
1312 040501 - Disclosure - Financial assets at fair value through other comprehensive income - Securities by type (Details) Network

*

*

 http://www.ing.com/role/FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeSecuritiesByTypeDetails
1313 Disclosure of financial assets [table] Table

*

*

 ifrs-full:DisclosureOfFinancialAssetsTable
1314 Categories of financial assets [axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
1315 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
1316 Equity securities [member] Member ifrs-full:InvestmentsInEquityInstrumentsMeasuredAtFairValueThroughOtherComprehensiveIncomeMember
1317 Debt securities [member] Member ifrs-full:DebtSecuritiesMember
1318 Loans and advances [member] Member ifrs-full:LoansAndReceivablesCategoryMember
1319 Available-for-sale investments [member] Member ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
1320 Held-to-maturity investments [member] Member ifrs-full:HeldtomaturityInvestmentsCategoryMember
1321 Disclosure of financial assets [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsLineItems
1322 Financial assets at fair value through other comprehensive income Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncome
1323 Investments Concept (Monetary) As Of Debit ing:FinancialAssetsAvailableForSaleAndHeldToMaturityInvestments
1324 040502 - Disclosure - Financial assets at fair value through other comprehensive income - Equity Securities (Details) Network

*

*

 http://www.ing.com/role/FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeEquitySecuritiesDetails
1325 Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [table] Table

*

*

 ifrs-full:DisclosureOfFairValueOfInvestmentsInEquityInstrumentsDesignatedAsMeasuredAtFairValueThroughOtherComprehensiveIncomeTable
1326 Investments in equity instruments designated at fair value through other comprehensive income [axis] Axis ifrs-full:InvestmentsInEquityInstrumentsMeasuredAtFairValueThroughOtherComprehensiveIncomeAxis
1327 Investments in equity instruments designated at fair value through other comprehensive income [member] Member ifrs-full:InvestmentsInEquityInstrumentsMeasuredAtFairValueThroughOtherComprehensiveIncomeMember
1328 Investment in Bank of Beijing [member] Member ing:InvestmentInBankOfBeijingMember
1329 Investment in Kotak Mahindra Bank [member] Member ing:InvestmentInKotakMahindraBankMember
1330 Other Investments [member] Member ing:OtherEquityInvestmentsMember
1331 Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] LineItems ifrs-full:DisclosureOfFairValueOfInvestmentsInEquityInstrumentsDesignatedAsMeasuredAtFairValueThroughOtherComprehensiveIncomeLineItems
1332 Fair value Concept (Monetary) As Of Debit ifrs-full:FairValueOfInvestmentsInEquityInstrumentsDesignatedAsMeasuredAtFairValueThroughOtherComprehensiveIncome
1333 Dividend income recognised in 2018 Concept (Monetary) For Period Credit ifrs-full:DividendsRecognisedForInvestmentsInEquityInstrumentsDesignatedAsMeasuredAtFairValueThroughOtherComprehensiveIncomeHeldAtEndOfReportingPeriod
1334 040503 - Disclosure - Financial assets at fair value through other comprehensive income - Changes in fair value (Details) Network

*

*

 http://www.ing.com/role/FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeChangesInFairValueDetails
1335 Disclosure of financial assets [table] Table

*

*

 ifrs-full:DisclosureOfFinancialAssetsTable
1336 Categories of financial assets [axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
1337 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
1338 FVOCI [member] Member ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember
1339 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
1340 Assets [member] Member ifrs-full:ClassesOfAssetsMember
1341 Equity securities [member] Member ifrs-full:OtherEquitySecuritiesMember
1342 Debt securities [member] Member ifrs-full:DebtSecuritiesMember
1343 Disclosure of financial assets [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsLineItems
1344 Opening balance Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
1345 Effect of changes in accounting policy Concept (Monetary) For Period Debit ing:IncreaseDecreaseInFinancialAssetsDueToChangesInAccountingPolicy
1346 Additions Concept (Monetary) For Period Debit ifrs-full:IncreaseThroughOriginationOrPurchaseFinancialAssets
1347 Amortisation Concept (Monetary) For Period Debit ifrs-full:AmortisationExpense
1348 Transfers and reclassifications Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughTransfersFinancialAssets
1349 Changes in unrealised revaluations Concept (Monetary) For Period Debit ing:IncreaseDecreaseInUnrealisedRevaluationsFinancialAssets
1350 Impairments Concept (Monetary) For Period Credit ifrs-full:DecreaseThroughWriteoffFinancialAssets
1351 Reversals of impairments Concept (Monetary) For Period Debit ing:ReversalOfImpairmentsFinancialAssets
1352 Disposals and redemptions Concept (Monetary) For Period Credit ifrs-full:DecreaseThroughDerecognitionFinancialAssets
1353 Exchange rate differences Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughForeignExchangeFinancialAssets
1354 Changes in the composition of the group and other changes Concept (Monetary) For Period Debit ing:IncreaseDecreaseInCompositionOfGroupAndOtherChanges
1355 Closing balance Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
1356 040505 - Disclosure - Financial assets at fair value through other comprehensive income - Additional information (Details) Network

*

*

 http://www.ing.com/role/FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeAdditionalInformationDetails
1357 Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [table] Table

*

*

 ifrs-full:DisclosureOfFairValueOfInvestmentsInEquityInstrumentsDesignatedAsMeasuredAtFairValueThroughOtherComprehensiveIncomeTable
1358 Investments in equity instruments designated at fair value through other comprehensive income [axis] Axis ifrs-full:InvestmentsInEquityInstrumentsMeasuredAtFairValueThroughOtherComprehensiveIncomeAxis
1359 Investments in equity instruments designated at fair value through other comprehensive income [member] Member ifrs-full:InvestmentsInEquityInstrumentsMeasuredAtFairValueThroughOtherComprehensiveIncomeMember
1360 Investment in Kotak Mahindra Bank [member] Member ing:InvestmentInKotakMahindraBankMember
1361 Categories of financial assets [axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
1362 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
1363 Financial assets at fair value through other comprehensive income, category [member] Member ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember
1364 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
1365 Assets [member] Member ifrs-full:ClassesOfAssetsMember
1366 Debt securities [member] Member ifrs-full:DebtSecuritiesMember
1367 Loans and receivables, category [member] Member ifrs-full:LoansAndReceivablesCategoryMember
1368 Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] LineItems ifrs-full:DisclosureOfFairValueOfInvestmentsInEquityInstrumentsDesignatedAsMeasuredAtFairValueThroughOtherComprehensiveIncomeLineItems
1369 Reduction in stake Concept (Percent) For Period ing:ProportionOfOwnershipInterestDivested
1370 Ownership interest held in equity based investments Concept (Percent) For Period ing:OwnershipInterestHeldInEquityBasedInvestments
1371 Number of shares sold Concept (Shares) As Of ing:NumberOfSharesSoldInDivestingInterestInEquityBasedInvestments
1372 Proceeds from sale of investments accounted for using equity method Concept (Monetary) For Period Debit ifrs-full:ProceedsFromSalesOfInvestmentsAccountedForUsingEquityMethod
1373 Fair value Concept (Monetary) As Of Debit ifrs-full:FairValueOfInvestmentsInEquityInstrumentsDesignatedAsMeasuredAtFairValueThroughOtherComprehensiveIncome
1374 Gains on disposals of investments Concept (Monetary) For Period Credit ifrs-full:GainsOnDisposalsOfInvestments
1375 Loan loss provisions Concept (Monetary) As Of Credit ifrs-full:AllowanceAccountForCreditLossesOfFinancialAssets
1376 040601 - Disclosure - Securities at amortised cost (Detail) Network

*

*

 http://www.ing.com/role/SecuritiesAtAmortisedCostDetail
1377 Disclosure of financial assets [table] Table

*

*

 ifrs-full:DisclosureOfFinancialAssetsTable
1378 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
1379 Assets [member] Member ifrs-full:ClassesOfAssetsMember
1380 Debt securities [member] Member ifrs-full:DebtSecuritiesMember
1381 Held-to-maturity investments [member] Member ifrs-full:HeldtomaturityInvestmentsCategoryMember
1382 Disclosure of financial assets [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsLineItems
1383 Financial assets at amortised cost Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtAmortisedCost
1384 040602 - Disclosure - Securities at amortised cost - Debt Securities (Detail) Network

*

*

 http://www.ing.com/role/SecuritiesAtAmortisedCostDebtSecuritiesDetail
1385 Disclosure of financial assets [table] Table

*

*

 ifrs-full:DisclosureOfFinancialAssetsTable
1386 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
1387 Assets [member] Member ifrs-full:ClassesOfAssetsMember
1388 Debt securities [member] Member ifrs-full:DebtSecuritiesMember
1389 Disclosure of financial assets [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsLineItems
1390 Financial assets at fair value through other comprehensive income Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncome
1391 Financial assets at amortised cost Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtAmortisedCost
1392 Available-for-sale investments Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAvailableforsale
1393 Held-to-maturity investments Concept (Monetary) As Of Debit ifrs-full:HeldtomaturityInvestments
1394 Loans and advances to customers Concept (Monetary) As Of Debit ifrs-full:LoansAndAdvancesToCustomers
1395 Loans and advances to banks Concept (Monetary) As Of Debit ifrs-full:LoansAndAdvancesToBanks
1396 Debt securities at fair value through other comprehensive income and amortised cost Concept (Monetary) As Of Debit ing:FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeAndAmortisedCost
1397 Trading assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTrading
1398 Debt securities at fair value through profit and loss Concept (Monetary) As Of Debit ing:DebtSecuritiesAtFairValueThroughProfitAndLoss
1399 Financial assets at fair value through profit or loss Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLoss
1400 Total Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
1401 040607 - Disclosure - Securities at amortised cost - Debt securities by type and balance sheet lines (Detail) Network

*

*

 http://www.ing.com/role/SecuritiesAtAmortisedCostDebtSecuritiesByTypeAndBalanceSheetLinesDetail
1402 Disclosure of financial assets [table] Table

*

*

 ifrs-full:DisclosureOfFinancialAssetsTable
1403 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
1404 Assets [member] Member ifrs-full:ClassesOfAssetsMember
1405 Debt securities [member] Member ifrs-full:DebtSecuritiesMember
1406 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
1407 Financial instruments, class [member] Member ifrs-full:ClassesOfFinancialInstrumentsMember
1408 Government bonds [member] Member ifrs-full:LoansToGovernmentMember
1409 Sub-sovereign Supranationals and Agencies [member] Member ing:SubsovereignSupranationalsAndAgenciesMember
1410 Covered bonds [member] Member ifrs-full:MortgagesMember
1411 Corporate bonds [member] Member ifrs-full:CorporateLoansMember
1412 Financial institutions bonds [member] Member ing:FinancialInstitutionsBondsMember
1413 ABS portfolio [member] Member ing:ABSPortfolioMember
1414 Bond portfolio [member] Member ing:BondPortfolioMember
1415 Categories of financial assets [axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
1416 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
1417 Financial assets at FVPL [member] Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember
1418 Financial assets at FVOCI [member] Member ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember
1419 Financial assets at amortised cost [member] Member ifrs-full:FinancialAssetsAtAmortisedCostCategoryMember
1420 Disclosure of financial assets [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsLineItems
1421 Financial assets before allowance for loan loss provision Concept (Monetary) As Of Debit ing:FinancialAssetsBeforeAllowanceForLoanLosssProvision
1422 Loan loss provisions Concept (Monetary) As Of Credit ifrs-full:AllowanceAccountForCreditLossesOfFinancialAssets
1423 Financial assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
1424 040608 - Disclosure - Securities at amortised cost - Additional Information (Detail) Network

*

*

 http://www.ing.com/role/SecuritiesAtAmortisedCostAdditionalInformationDetail
1425 Disclosure of detailed information about financial instruments [table] Table

*

*

 ifrs-full:DisclosureOfFinancialInstrumentsTable
1426 Associates [axis] Axis ifrs-full:SignificantInvestmentsInAssociatesAxis
1427 Entity's total for associates [member] Member ifrs-full:EntitysTotalForAssociatesMember
1428 Kotak Mahindra Bank [member] Member ing:KotakMahindraBankMember
1429 Bank of Beijing [member] Member ing:BankOfBeijingMember
1430 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
1431 Assets [member] Member ifrs-full:ClassesOfAssetsMember
1432 Debt securities [member] Member ifrs-full:DebtSecuritiesMember
1433 Other equity securities [member] Member ifrs-full:OtherEquitySecuritiesMember
1434 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
1435 Risks [member] Member ifrs-full:TypesOfRisksMember
1436 Exposure [Member] Member ing:FinancialExposureMemberMember
1437 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
1438 Financial instruments, class [member] Member ifrs-full:ClassesOfFinancialInstrumentsMember
1439 Bond Portfolio [Member] Member ing:BondPortfolioMember
1440 Disclosure of detailed information about financial instruments [line items] LineItems ifrs-full:DisclosureOfFinancialInstrumentsLineItems
1441 Financial assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
1442 Financial assets at amortized cost Concept (Monetary) As Of Debit ing:DebtSecuritiesAtAmortisedCostsAndAvailableforsaleInvestment
1443 Exposure percentage in ABS portfolio Concept (Percent) For Period ing:PercentageOfExposureInABSPortfolio
1444 Description of rating agencies used Concept (Text/String) For Period ifrs-full:DescriptionOfRatingAgenciesUsed
1445 Borrowed debt securities Concept (Monetary) As Of Debit ing:BorrowedDebtSecurities
1446 Decrease in available-for-sale debt securities Concept (Monetary) For Period Debit ing:IncreaseDecreaseInAvailableforsaleFinancialAssets
1447 Number of shares held Concept (Monetary) As Of Debit ifrs-full:EquityInstrumentsHeld
1448 Voting equity interest percentage Concept (Percent) As Of ifrs-full:PercentageOfVotingEquityInterestsAcquired
1449 Carrying value Concept (Monetary) For Period Credit ifrs-full:ProfitsLossesOnDisposalOfInvestmentsAndChangesInValueOfInvestments
1450 040650 - Disclosure - Loans and Advances to Customers - Loans and advances to customers by type (Detail) Network

*

*

 http://www.ing.com/role/LoansAndAdvancesToCustomersLoansAndAdvancesToCustomersByTypeDetail
1451 Disclosure of detailed information about financial instruments [table] Table

*

*

 ifrs-full:DisclosureOfFinancialInstrumentsTable
1452 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
1453 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
1454 Netherlands [member] Member country:NL
1455 International [member] Member ifrs-full:ForeignCountriesMember
1456 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
1457 Financial instruments, class [member] Member ifrs-full:ClassesOfFinancialInstrumentsMember
1458 Loans to, or guaranteed by, public authorities [member] Member ifrs-full:LoansToGovernmentMember
1459 Loans secured by mortgages [member] Member ifrs-full:MortgagesMember
1460 Loans guaranteed by credit institutions [Member] Member ing:LoansGuaranteedByCreditInstitutionsMember
1461 Personal lending [Member] Member ing:PersonalLendingMember
1462 Asset backed securities [member] Member ifrs-full:AssetbackedFinancingsMember
1463 Corporate loans [member] Member ifrs-full:CorporateLoansMember
1464 Disclosure of detailed information about financial instruments [line items] LineItems ifrs-full:DisclosureOfFinancialInstrumentsLineItems
1465 Loans and advances to customers before provisions Concept (Monetary) As Of Debit ing:LoansAndAdvancesToCustomersBeforeProvisions
1466 Loan loss provisions Concept (Monetary) As Of Credit ifrs-full:AllowanceAccountForCreditLossesOfFinancialAssets
1467 Loans and advances to customers Concept (Monetary) As Of Debit ifrs-full:LoansAndAdvancesToCustomers
1468 040651 - Disclosure - Loans and Advances to Customers - Loans and Advances to Customers by Subordination (Detail) Network

*

*

 http://www.ing.com/role/LoansAndAdvancesToCustomersLoansAndAdvancesToCustomersBySubordinationDetail
1469 Disclosure of loans and advances to customers [Table] Table

*

*

 ing:DisclosureOfLoansAndAdvancesToCustomersTable
1470 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
1471 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
1472 Non-subordinated [member] Member ing:NonsubordinatedMember
1473 Subordinated [member] Member ing:SubordinatedMember
1474 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
1475 Financial instruments, class [member] Member ifrs-full:ClassesOfFinancialInstrumentsMember
1476 Loans and advances to customers [member] Member ing:LoansAndAdvancesToCustomersMember
1477 Disclosure of detailed information about financial instruments [line items] LineItems ifrs-full:DisclosureOfFinancialInstrumentsLineItems
1478 Loans and advances to customers Concept (Monetary) As Of Debit ifrs-full:LoansAndAdvancesToCustomers
1479 040652 - Disclosure - Loans and Advances to Customers - Credit quality analysis : Loans and advances to customers (at amortised cost) (Detail) Network

*

*

 http://www.ing.com/role/LoansAndAdvancesToCustomersCreditQualityAnalysisLoansAndAdvancesToCustomersatAmortisedCostDetail
1480 Disclosure of detailed information about financial instruments [table] Table

*

*

 ifrs-full:DisclosureOfFinancialInstrumentsTable
1481 Type of measurement of expected credit losses [axis] Axis ifrs-full:TypeOfMeasurementOfExpectedCreditLossesAxis
1482 Type of measurement of expected credit losses [member] Member ifrs-full:TypeOfMeasurementOfExpectedCreditLossesMember
1483 Stage 1: 12-month expected credit losses [member] Member ifrs-full:TwelvemonthExpectedCreditLossesMember
1484 Stage 2: Lifetime expected credit losses [member] Member ifrs-full:LifetimeExpectedCreditLossesMember
1485 Stage 3: Lifetime Expected Credit Losses [member] Member ing:StageThreeLifetimeExpectedCreditLossesMember
1486 Credit impairment of financial instruments [axis] Axis ifrs-full:CreditImpairmentOfFinancialInstrumentsAxis
1487 Credit impairment of financial instruments [member] Member ifrs-full:CreditImpairmentOfFinancialInstrumentsMember
1488 Not credit-impaired [member] Member ifrs-full:FinancialInstrumentsNotCreditimpairedMember
1489 Credit impaired [member] Member ifrs-full:FinancialInstrumentsCreditimpairedMember
1490 Purchased credit impaired [member] Member ifrs-full:FinancialInstrumentsPurchasedOrOriginatedCreditimpairedMember
1491 Internal credit grades [axis] Axis ifrs-full:InternalCreditGradesAxis
1492 Entity's total for internal credit grades [member] Member ifrs-full:EntitysTotalForInternalCreditGradesMember
1493 Grades 1-10 Investment grade [Member] Member ing:InvestmentGradeMember
1494 Grades 11-17 Non-investment grade [member] Member ing:NoninvestmentGradeWholesaleMember
1495 Grades 18-19 Substandard grade [member] Member ing:SubstandardGradeMember
1496 Grade 20-22 Non-performing grade [member] Member ing:NonperformingGradeMember
1497 Disclosure of detailed information about financial instruments [line items] LineItems ifrs-full:DisclosureOfFinancialInstrumentsLineItems
1498 Loans and advances to customers before provisions Concept (Monetary) As Of Debit ing:LoansAndAdvancesToCustomersBeforeProvisions
1499 Loan loss on provisions Concept (Monetary) As Of Credit ifrs-full:AllowanceAccountForCreditLossesOfFinancialAssets
1500 Loans and advances to customers Concept (Monetary) As Of Debit ifrs-full:LoansAndAdvancesToCustomers
1501 040653 - Disclosure - Loans and Advances to Customers - Changes in Loan Loss Provisions (Detail) Network

*

*

 http://www.ing.com/role/LoansAndAdvancesToCustomersChangesInLoanLossProvisionsDetail
1502 Disclosure of financial assets [table] Table

*

*

 ifrs-full:DisclosureOfFinancialAssetsTable
1503 Credit impairment of financial instruments [axis] Axis ifrs-full:CreditImpairmentOfFinancialInstrumentsAxis
1504 Credit impairment of financial instruments [member] Member ifrs-full:CreditImpairmentOfFinancialInstrumentsMember
1505 Not credit-impaired [member] Member ifrs-full:FinancialInstrumentsNotCreditimpairedMember
1506 Credit impaired [member] Member ifrs-full:FinancialInstrumentsCreditimpairedMember
1507 Purchased credit impaired [member] Member ifrs-full:FinancialInstrumentsPurchasedOrOriginatedCreditimpairedMember
1508 Type of measurement of expected credit losses [axis] Axis ifrs-full:TypeOfMeasurementOfExpectedCreditLossesAxis
1509 Type of measurement of expected credit losses [member] Member ifrs-full:TypeOfMeasurementOfExpectedCreditLossesMember
1510 Stage 1: 12-month expected credit losses [member] Member ifrs-full:TwelvemonthExpectedCreditLossesMember
1511 Stage 2: Lifetime expected credit losses [member] Member ifrs-full:LifetimeExpectedCreditLossesMember
1512 Stage 3: Lifetime Expected Credit Losses [member] Member ing:StageThreeLifetimeExpectedCreditLossesMember
1513 Initially applied IFRSs [axis] Axis ifrs-full:InitiallyAppliedIFRSsAxis
1514 Initially applied IFRSs [member] Member ifrs-full:InitiallyAppliedIFRSsMember
1515 In accordance with IFRS 9 [member] Member ifrs-full:InAccordanceWithIFRS9Member
1516 IAS 39 [Member] Member ing:Ias39Member
1517 Impairment of financial assets [axis] Axis ifrs-full:ImpairmentOfFinancialAssetsAxis
1518 Entity's total for impairment of financial assets [member] Member ifrs-full:EntitysTotalForImpairmentOfFinancialAssetsMember
1519 Financial Assets Impaired [member] Member ifrs-full:FinancialAssetsImpairedMember
1520 Disclosure of financial assets [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsLineItems
1521 Opening balance Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
1522 Effect of changes in accounting policy Concept (Monetary) As Of Debit ifrs-full:IncreaseDecreaseInFinancialAssetsArisingFromChangeInMeasurementAttributeFirstApplicationOfIFRS9
1523 Opening balance as at 1 January IFRS 9 Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsCarryingAmountImmediatelyAfterInitialApplicationOfIFRS9
1524 Transfers and reclassifications Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughTransfersFinancialAssets
1525 Net remeasurement of loan loss provision Concept (Monetary) For Period Debit ing:NetRemeasurementOfLoanLossProvision
1526 New financial assets originated or purchased Concept (Monetary) For Period Debit ifrs-full:IncreaseThroughOriginationOrPurchaseFinancialAssets
1527 Financial assets that have been derecognised Concept (Monetary) For Period Credit ifrs-full:DecreaseThroughDerecognitionFinancialAssets
1528 Write-offs Concept (Monetary) For Period Credit ifrs-full:DecreaseThroughWriteoffFinancialAssets
1529 Recoveries of amounts previously written off Concept (Monetary) For Period Debit ing:ChangesInLoanLossProvisionsRecoveries
1530 Increase in loan loss provisions Concept (Monetary) For Period ifrs-full:AdditionalAllowanceRecognisedInProfitOrLossAllowanceAccountForCreditLossesOfFinancialAssets
1531 Changes in models Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughChangesInModelsOrRiskParametersFinancialAssets
1532 Exchange rate differences Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughForeignExchangeFinancialAssets
1533 Closing balance Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
1534 040654 - Disclosure - Loans and Advances to Customers - Financial assets modified during the period and since initial recognition (Detail) Network

*

*

 http://www.ing.com/role/LoansAndAdvancesToCustomersFinancialAssetsModifiedDuringThePeriodAndSinceInitialRecognitionDetail
1535 Implied Table Table

*

*

 implied:Table
1536 Loans and advances to customers [Abstract] Abstract ifrs-full:ReconciliationOfChangesInAllowanceAccountForCreditLossesOfFinancialAssetsAbstract
1537 Financial assets modified [abstract] Abstract ing:FinancialAssetsModifiedAbstract
1538 Amortised cost before modification Concept (Monetary) For Period Debit ifrs-full:FinancialAssetsWithContractualCashFlowsModifiedDuringReportingPeriodWhileLossAllowanceMeasuredAtLifetimeExpectedCreditLossesAmortisedCostBeforeModification
1539 Net Modification loss Concept (Monetary) For Period Credit ifrs-full:FinancialAssetsWithContractualCashFlowsModifiedDuringReportingPeriodWhileLossAllowanceMeasuredAtLifetimeExpectedCreditLossesModificationGainLoss
1540 Gross carrying amount at 31 December of financial assets for which loss allowance has changed to 12-month measurement during the period Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsWithModifiedContractualCashFlowsWhileLossAllowanceMeasuredAtLifetimeExpectedCreditLossesForWhichLossAllowanceChangedDuringReportingPeriodTo12monthExpectedCreditLossesGrossCarryingAmount
1541 040655 - Disclosure - Loans and Advances to Customers - Finance Lease Receivables (Detail) Network

*

*

 http://www.ing.com/role/LoansAndAdvancesToCustomersFinanceLeaseReceivablesDetail
1542 Disclosure of finance lease and operating lease by lessor [table] Table

*

*

 ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLessorTable
1543 Maturity [axis] Axis ifrs-full:MaturityAxis
1544 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
1545 Within 1 year [member] Member ifrs-full:NotLaterThanOneYearMember
1546 More than 1 year but less than 5 years [member] Member ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember
1547 More than 5 years [member] Member ifrs-full:LaterThanFiveYearsMember
1548 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
1549 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
1550 Loans to financial institutions [member] Member ing:LoansToFinancialInstitutionsMember
1551 Loans to consumers [member] Member ifrs-full:ConsumerLoansMember
1552 Disclosure of finance lease and operating lease by lessor [line items] LineItems ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLessorLineItems
1553 Maturities of gross investment in finance lease receivables Concept (Monetary) As Of Debit ifrs-full:FinanceLeaseReceivables
1554 Unearned future finance income on finance leases Concept (Monetary) As Of Debit ifrs-full:UnearnedFinanceIncomeOnFinanceLease
1555 Net investment in finance leases Concept (Monetary) As Of Debit ifrs-full:NetInvestmentInFinanceLease
1556 Included in Loans and advances to banks Concept (Monetary) As Of Debit ing:FinanceLeaseIncludedInLoansAndAdvancesToBanks
1557 Included in Loans and advances to customers Concept (Monetary) As Of Debit ing:FinanceLeaseIncludedInLoansAndAdvancesToCustomers
1558 040656 - Disclosure - Loans and Advances to Customers - Additional Information (Detail) Network

*

*

 http://www.ing.com/role/LoansAndAdvancesToCustomersAdditionalInformationDetail
1559 Disclosure of financial assets [table] Table

*

*

 ifrs-full:DisclosureOfFinancialAssetsTable
1560 Type of measurement of expected credit losses [axis] Axis ifrs-full:TypeOfMeasurementOfExpectedCreditLossesAxis
1561 Type of measurement of expected credit losses [member] Member ifrs-full:TypeOfMeasurementOfExpectedCreditLossesMember
1562 Stage 1: 12-month expected credit losses [member] Member ifrs-full:TwelvemonthExpectedCreditLossesMember
1563 Stage 2: Lifetime expected credit losses [member] Member ifrs-full:LifetimeExpectedCreditLossesMember
1564 Stage 3: Lifetime Expected Credit Losses [member] Member ing:StageThreeLifetimeExpectedCreditLossesMember
1565 Impairment of financial assets [axis] Axis ifrs-full:ImpairmentOfFinancialAssetsAxis
1566 Entity's total for impairment of financial assets [member] Member ifrs-full:EntitysTotalForImpairmentOfFinancialAssetsMember
1567 Financial Assets Impaired [member] Member ifrs-full:FinancialAssetsImpairedMember
1568 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
1569 Assets [member] Member ifrs-full:ClassesOfAssetsMember
1570 Loans and advances to central banks [Member] Member ing:LoansAndAdvancesToCentralBanksMember
1571 Financial assets at FVOCI [member] Member ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember
1572 Securities at amortised cost [Member] Member ing:SecuritiesAtAmortisedCostMember
1573 Loans And Advances To Banks [Member] Member ing:LoansAndAdvancesToBanksMember
1574 Classes of other provisions [axis] Axis ifrs-full:ClassesOfProvisionsAxis
1575 Other provisions [member] Member ifrs-full:OtherProvisionsMember
1576 Provisions for loans and advances to customers [Member] Member ing:ProvisionsForLoansAndAdvancesToCustomersMember
1577 Provisions for contingent liabilities [member] Member ifrs-full:OtherContingentLiabilitiesMember
1578 Non-credit replacement off balance sheet positions [Member] Member ing:NonCreditReplacementOffBalanceSheetPositionsMember
1579 Disclosure of financial assets [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsLineItems
1580 Allowance for finance lease receivables included in loan loss provisions Concept (Monetary) For Period Credit ing:AllowanceForFinanceLeaseReceivablesIncludedInLoanLossProvisions
1581 Loan loss on provisions Concept (Monetary) As Of Credit ifrs-full:AllowanceAccountForCreditLossesOfFinancialAssets
1582 Increase in loan loss provisions Concept (Monetary) For Period ifrs-full:AdditionalAllowanceRecognisedInProfitOrLossAllowanceAccountForCreditLossesOfFinancialAssets
1583 Other provisions Concept (Monetary) As Of Credit ifrs-full:OtherProvisions
1584 040701 - Disclosure - Investments in Associates and Joint Ventures - Summary of Investments in Associates and Joint Ventures (Detail) Network

*

*

 http://www.ing.com/role/InvestmentsInAssociatesAndJointVenturesSummaryOfInvestmentsInAssociatesAndJointVenturesDetail
1585 Disclosure of Investments in Associates and Joint Ventures [Table] Table

*

*

 ing:DisclosureOfInvestmentsInAssociatesAndJointVenturesTable
1586 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
1587 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
1588 TMB Public Company Limited. [member] Member ifrs-full:AssociatesMember
1589 Other investments in associates and joint ventures [member] Member ing:OtherInvestmentsInAssociatesAndJointVenturesMember
1590 Disclosure of Investments in Associates and Joint Ventures [Line Items] LineItems ing:DisclosureOfInvestmentsInAssociatesAndJointVenturesLineItems
1591 Interest held Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInAssociate
1592 Fair value of listed investment Concept (Monetary) As Of Debit ing:FairValueOfListedInvestment
1593 Balance sheet value Concept (Monetary) As Of Debit ifrs-full:InvestmentsInSubsidiariesJointVenturesAndAssociates
1594 Total assets Concept (Monetary) As Of Debit ifrs-full:Assets
1595 Total liabilities Concept (Monetary) As Of Credit ifrs-full:Liabilities
1596 Total Income Concept (Monetary) For Period Credit ifrs-full:Revenue
1597 Total expenses Concept (Monetary) For Period Debit ifrs-full:OperatingExpense
1598 040702 - Disclosure - Investments in Associates and Joint Ventures - Summary of Changes in Investments in Associates and Joint ventures (Detail) Network

*

*

 http://www.ing.com/role/InvestmentsInAssociatesAndJointVenturesSummaryOfChangesInInvestmentsInAssociatesAndJointVenturesDetail
1599 Disclosure of Investments in Associates and Joint Ventures [Table] Table

*

*

 ing:DisclosureOfInvestmentsInAssociatesAndJointVenturesTable
1600 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
1601 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
1602 Associates and joint ventures [member] Member ing:AssociatesAndJointVenturesMember
1603 Disclosure of Investments in Associates and Joint Ventures [Line Items] LineItems ing:DisclosureOfInvestmentsInAssociatesAndJointVenturesLineItems
1604 Opening balance Concept (Monetary) As Of Debit ifrs-full:InvestmentsInSubsidiariesJointVenturesAndAssociates
1605 Effect of changes in accounting policy Concept (Monetary) For Period Debit ing:EffectOfChangesInAccountingPolicyIFRS9
1606 Additions Concept (Monetary) For Period Debit ing:AdditionsInInvestmentsInAssociatesAndJointVentures
1607 Transfers to and from Investments/Other assets and liabilities Concept (Monetary) For Period Debit ing:TransferToAndFromInvestmentsOtherAssetsAndLiabilities
1608 Revaluations Concept (Monetary) For Period Debit ing:RevaluationIncreaseDecreaseInvestmentsInAssociatesAndJointVentures
1609 Share of results Concept (Monetary) For Period Credit ifrs-full:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
1610 Dividends received Concept (Monetary) For Period Debit ifrs-full:DividendsReceivedClassifiedAsInvestingActivities
1611 Disposals Concept (Monetary) For Period Credit ing:DisposalsOfInvestmentsInAssociatesAndJointVentures
1612 Impairments Concept (Monetary) For Period Debit ing:ImpairmentLossOfInvestmentsInAssociatesAndJointVentures
1613 Exchange rate differences Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughForeignExchangeFinancialAssets
1614 Other Concept (Monetary) For Period Debit ing:OtherChangesInInvestmentsAccountedForUsingEquityMethod
1615 Closing balance Concept (Monetary) As Of Debit ifrs-full:InvestmentsInSubsidiariesJointVenturesAndAssociates
1616 040703 - Disclosure - Investments in Associates and Joint Ventures - Additional Information (Detail) Network

*

*

 http://www.ing.com/role/InvestmentsInAssociatesAndJointVenturesAdditionalInformationDetail
1617 Disclosure of Investments in Associates and Joint Ventures [Table] Table

*

*

 ing:DisclosureOfInvestmentsInAssociatesAndJointVenturesTable
1618 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
1619 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
1620 TMB Public Company Limited. [member] Member ifrs-full:AssociatesMember
1621 Associates and joint ventures [member] Member ing:AssociatesAndJointVenturesMember
1622 Visa europe limited [member] Member ing:VISAEuropeLimitedMember
1623 Enterprise Center [member] Member ing:EnterpriseCenterMember
1624 CBRE Asia Value Fund [member] Member ing:CBREAsiaValueFundMember
1625 Equens SE [member] Member ing:EquensSEMember
1626 Appia Group [member] Member ing:AppiaGroupMember
1627 Individually insignificant associates and joint ventures [Member] Member ing:IndividuallyInsignificantAssociatesAndJointVenturesMember
1628 Range [axis] Axis ifrs-full:RangeAxis
1629 Ranges [member] Member ifrs-full:RangesMember
1630 Top of range [member] Member ifrs-full:TopOfRangeMember
1631 Disclosure of Investments in Associates and Joint Ventures [Line Items] LineItems ing:DisclosureOfInvestmentsInAssociatesAndJointVenturesLineItems
1632 Percentage of ownership interest Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInAssociate
1633 Investments in joint ventures and associates Concept (Text/String) For Period ing:DescriptionOfOtherInvestmentsInJointVenturesAndAssociates
1634 Balance sheet value Concept (Monetary) As Of Debit ifrs-full:InvestmentsInSubsidiariesJointVenturesAndAssociates
1635 Accumulated impairments Concept (Monetary) For Period Debit ing:AccumulatedImpairmentOnInvestmentInAssociatesAndJointVentures
1636 Transfers to and from Investments/Other assets and liabilities Concept (Monetary) For Period Debit ing:TransfersToAndFromInvestmentsotherAssetsAndLiabilities
1637 Transfers to and reclassification from available-for-sale equity securities to associates Concept (Monetary) For Period Debit ing:TransferToAndFromAvailableForSaleInvestments
1638 Reclassification from/to other assets and other liabilities Concept (Monetary) For Period Debit ing:TransferToAndFromOtherAssetsAndOtherLiabilities
1639 Other revaluation amount Concept (Monetary) For Period Debit ing:OtherRevaluationIncreaseDecreaseInvestmentsInAssociatesAndJointVentures
1640 Share of result from associates and joint ventures Concept (Monetary) For Period Credit ifrs-full:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
1641 Gain on disposal of shares Concept (Monetary) For Period Credit ifrs-full:GainsOnDisposalsOfInvestments
1642 Disposals and held for sales Concept (Monetary) For Period Credit ing:DisposalsOfInvestmentsInAssociatesAndJointVentures
1643 Capital repayments Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughOtherDistributionsToOwners
1644 040801 - Disclosure - Property and Equipment - Schedule of Property and Equipment (Detail) Network

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*

 http://www.ing.com/role/PropertyAndEquipmentScheduleOfPropertyAndEquipmentDetail
1645 Disclosure of detailed information about property, plant and equipment [table] Table

*

*

 ifrs-full:DisclosureOfPropertyPlantAndEquipmentTable
1646 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
1647 Property and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
1648 Property in own use [member] Member ing:PropertyMember
1649 Equipment [member] Member ifrs-full:OfficeEquipmentMember
1650 Assets under operating leases [member] Member ifrs-full:PropertyPlantAndEquipmentUnderOperatingLeasesMember
1651 Disclosure of detailed information about property, plant and equipment [line items] LineItems ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
1652 Total property and equipment by type Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
1653 040802 - Disclosure - Property and Equipment - Schedule of Changes in Property in Own Use (Detail) Network

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*

 http://www.ing.com/role/PropertyAndEquipmentScheduleOfChangesInPropertyInOwnUseDetail
1654 Disclosure of detailed information about property, plant and equipment [table] Table

*

*

 ifrs-full:DisclosureOfPropertyPlantAndEquipmentTable
1655 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
1656 Property and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
1657 Property in own use [member] Member ing:PropertyMember
1658 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
1659 Carrying amount [member] Member ifrs-full:CarryingAmountMember
1660 Gross carrying amount [member] Member ifrs-full:GrossCarryingAmountMember
1661 Accumulated depreciation [member] Member ing:AccumulatedDepreciationMember
1662 Accumulated impairments [member] Member ifrs-full:AccumulatedImpairmentMember
1663 Disclosure of detailed information about property, plant and equipment [line items] LineItems ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
1664 Opening balance Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
1665 Additions Concept (Monetary) For Period Debit ifrs-full:AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment
1666 - Transfers to and from Investment properties Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughTransfersFromToInvestmentPropertyPropertyPlantAndEquipment
1667 - Transfers to and from Other assets Concept (Monetary) For Period Debit ing:IncreaseDecreaseThroughTransfersFromToOtherAssets
1668 Total reclassifications Concept (Monetary) For Period Debit ing:ReclassificationsPropertyPlantAndEquipment
1669 Amounts recognised in the statement of profit or loss for the year [abstract] Abstract ing:AmountsRecognisedInTheStatementOfProfitOrLossForTheYear
1670 - Depreciation Concept (Monetary) For Period Debit ifrs-full:DepreciationExpense
1671 - Impairments Concept (Monetary) For Period Debit ifrs-full:ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss
1672 - Reversal of impairments Concept (Monetary) For Period ifrs-full:ReversalOfImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipment
1673 Total amounts recognised in the statement of profit or loss for the year Concept (Monetary) For Period Credit ing:AmountsRecognisedInProfitOrLossRelatingToPropertyPlantAndEquipment
1674 Revaluations recognised in equity during the year Concept (Monetary) For Period Credit ing:RevaluationsRecognisedInEquity
1675 Disposals Concept (Monetary) For Period Credit ifrs-full:DisposalsPropertyPlantAndEquipment
1676 Exchange rate differences Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughNetExchangeDifferencesPropertyPlantAndEquipment
1677 Closing balance Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
1678 Net carrying value Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
1679 Revaluation surplus [abstract] Abstract ing:RevaluationSurplusAbstract
1680 Opening balance Concept (Monetary) As Of Credit ifrs-full:PropertyPlantAndEquipmentRevaluationSurplus
1681 Revaluation in the year Concept (Monetary) For Period Debit ifrs-full:RevaluationIncreaseDecreasePropertyPlantAndEquipment
1682 Closing balance Concept (Monetary) As Of Credit ifrs-full:PropertyPlantAndEquipmentRevaluationSurplus
1683 040803 - Disclosure - Property and Equipment - Schedule of Changes in Equipment (Detail) Network

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*

 http://www.ing.com/role/PropertyAndEquipmentScheduleOfChangesInEquipmentDetail
1684 Disclosure of detailed information about property, plant and equipment [table] Table

*

*

 ifrs-full:DisclosureOfPropertyPlantAndEquipmentTable
1685 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
1686 Carrying amount [member] Member ifrs-full:CarryingAmountMember
1687 Gross carrying amount [member] Member ifrs-full:GrossCarryingAmountMember
1688 Accumulated depreciation [member] Member ing:AccumulatedDepreciationMember
1689 Accumulated impairments [member] Member ifrs-full:AccumulatedImpairmentMember
1690 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
1691 Assets [member] Member ifrs-full:ClassesOfAssetsMember
1692 Equipment [member] Member ifrs-full:OfficeEquipmentMember
1693 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
1694 Property and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
1695 Data Processing Equipment [member] Member ing:DataProcessingEquipmentMember
1696 Fixtures and fittings and other equipment [member] Member ing:FixturesAndFittingsAndOtherEquipmentMember
1697 Disclosure of detailed information about property, plant and equipment [line items] LineItems ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
1698 Opening balance Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
1699 Additions Concept (Monetary) For Period Debit ifrs-full:AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment
1700 Disposals Concept (Monetary) For Period Credit ifrs-full:DisposalsPropertyPlantAndEquipment
1701 Depreciation Concept (Monetary) For Period ifrs-full:DepreciationPropertyPlantAndEquipment
1702 - Impairments Concept (Monetary) For Period Debit ifrs-full:ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss
1703 Exchange rate differences Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughNetExchangeDifferencesPropertyPlantAndEquipment
1704 Changes in the composition of the group and other changes Concept (Monetary) For Period Credit ing:IncreaseDecreaseInEffectOfChangesInCompositionOfGroupAndOtherChanges
1705 Closing balance Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
1706 040804 - Disclosure - Property and Equipment - Additional Information (Detail) Network

*

*

 http://www.ing.com/role/PropertyAndEquipmentAdditionalInformationDetail
1707 Disclosure of detailed information about property, plant and equipment [table] Table

*

*

 ifrs-full:DisclosureOfPropertyPlantAndEquipmentTable
1708 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
1709 Property and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
1710 Property in own use [member] Member ing:PropertyMember
1711 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
1712 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
1713 Belgium [member] Member country:BE
1714 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
1715 Carrying amount [member] Member ifrs-full:CarryingAmountMember
1716 Gross carrying amount [member] Member ifrs-full:GrossCarryingAmountMember
1717 Accumulated depreciation [member] Member ing:AccumulatedDepreciationMember
1718 Accumulated impairments [member] Member ifrs-full:AccumulatedImpairmentMember
1719 Disclosure of detailed information about property, plant and equipment [line items] LineItems ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
1720 Property, Plant and Equipment, appraisal frequency Concept (Text/String) For Period ing:PropertyPlantAndEquipmentAppraisalFrequency
1721 Purchase price Concept (Monetary) For Period Credit ing:PurchasePriceOfPropertyPlantAndEquipment
1722 Property plant equipment, revalued Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipmentCarryingAmountAtCostOfRevaluedAssets
1723 Disposals Concept (Monetary) For Period Credit ifrs-full:DisposalsPropertyPlantAndEquipment
1724 040901 - Disclosure - Intangible Assets - Schedule of Changes in Intangible Assets (Detail) Network

*

*

 http://www.ing.com/role/IntangibleAssetsScheduleOfChangesInIntangibleAssetsDetail
1725 Disclosure of detailed information about intangible assets [table] Table

*

*

 ifrs-full:DisclosureOfIntangibleAssetsTable
1726 Classes of intangible assets and goodwill [axis] Axis ifrs-full:ClassesOfIntangibleAssetsAndGoodwillAxis
1727 Intangible assets and goodwill [member] Member ifrs-full:IntangibleAssetsAndGoodwillMember
1728 Goodwill [member] Member ifrs-full:GoodwillMember
1729 Software and other intangible assets [member] Member ifrs-full:ComputerSoftwareMember
1730 Other [Member] Member ifrs-full:OtherIntangibleAssetsMember
1731 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
1732 Carrying amount [member] Member ifrs-full:CarryingAmountMember
1733 Gross carrying amount [member] Member ifrs-full:GrossCarryingAmountMember
1734 Accumulated amortisation [Member] Member ifrs-full:AccumulatedDepreciationAndAmortisationMember
1735 Accumulated impairments [member] Member ifrs-full:AccumulatedImpairmentMember
1736 Disclosure of detailed information about intangible assets [line items] LineItems ifrs-full:DisclosureOfIntangibleAssetsLineItems
1737 Opening balance Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsAndGoodwill
1738 Additions Concept (Monetary) For Period Debit ifrs-full:AdditionsOtherThanThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill
1739 Capitalised expenses Concept (Monetary) For Period Debit ing:IncreaseDecreaseThroughCapitalisedExpensesIntangibleAssetsAndGoodwill
1740 Amortisation Concept (Monetary) For Period ifrs-full:AmortisationIntangibleAssetsOtherThanGoodwill
1741 Impairments Concept (Monetary) For Period ifrs-full:ImpairmentLossRecognisedInProfitOrLossIntangibleAssetsAndGoodwill
1742 Exchange rate differences Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughNetExchangeDifferencesIntangibleAssetsAndGoodwill
1743 Disposals Concept (Monetary) For Period Credit ifrs-full:DisposalsIntangibleAssetsAndGoodwill
1744 Changes in the composition of the group and other changes Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesIntangibleAssetsAndGoodwill
1745 Closing balance Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsAndGoodwill
1746 040902 - Disclosure - Intangible Assets - Schedule of Goodwill Allocation to Group of CGUs (Detail) Network

*

*

 http://www.ing.com/role/IntangibleAssetsScheduleOfGoodwillAllocationToGroupOfCGUsDetail
1747 Disclosure of detailed information about intangible assets [table] Table

*

*

 ifrs-full:DisclosureOfIntangibleAssetsTable
1748 Individual assets or cash-generating units [axis] Axis ifrs-full:IndividualAssetsOrCashgeneratingUnitsAxis
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1750 Retail Netherlands [member] Member ing:RetailNetherlandsMember
1751 Retail Belgium [member] Member ing:RetailBelgiumMember
1752 Retail Germany [member] Member ing:RetailGermanyMember
1753 Retail Growth Markets [member] Member ing:RetailGrowthMarketsMember
1754 Wholesale Banking [member] Member ing:WholesaleBankingMember
1755 Measurement [axis] Axis ifrs-full:MeasurementAxis
1756 Aggregated measurement [member] Member ifrs-full:AggregatedMeasurementMember
1757 Cash generating unit [member] Member ing:CashGeneratingUnitMember
1758 Disclosure of detailed information about intangible assets [line items] LineItems ifrs-full:DisclosureOfIntangibleAssetsLineItems
1759 Method used for recoverable amount Concept (Text/String) For Period ifrs-full:DescriptionOfBasisOnWhichUnitsRecoverableAmountHasBeenDetermined
1760 Discount rate Concept (Percent) As Of ifrs-full:DescriptionOfDiscountRatesAppliedToCashFlowProjections
1761 Long term growth rate Concept (Percent) As Of ifrs-full:DescriptionOfGrowthRateUsedToExtrapolateCashFlowProjections
1762 Goodwill Concept (Monetary) As Of Debit ifrs-full:Goodwill
1763 040903 - Disclosure - Intangible Assets - Schedule of Goodwill Allocation to Group of CGUs (Parenthetical) (Detail) Network

*

*

 http://www.ing.com/role/IntangibleAssetsScheduleOfGoodwillAllocationToGroupOfCGUsParentheticalDetail
1764 Disclosure of detailed information about intangible assets [table] Table

*

*

 ifrs-full:DisclosureOfIntangibleAssetsTable
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1766 Entity's total for individual assets or cash-generating units [member] Member ifrs-full:EntitysTotalForIndividualAssetsOrCashgeneratingUnitsMember
1767 Wholesale Banking [member] Member ing:WholesaleBankingMember
1768 Retail Growth [member] Member ing:RetailGrowthMember
1769 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
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1771 Growth Countries [Member] Member ing:GrowthCountriesMember
1772 Disclosure of detailed information about intangible assets [line items] LineItems ifrs-full:DisclosureOfIntangibleAssetsLineItems
1773 Goodwill Concept (Monetary) As Of Debit ifrs-full:Goodwill
1774 040904 - Disclosure - Intangible assets - Additional Information (Detail) Network

*

*

 http://www.ing.com/role/IntangibleAssetsAdditionalInformationDetail
1775 Disclosure of reconciliation of changes in intangible assets and goodwill [table] Table

*

*

 ifrs-full:DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillTable
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1778 Software and other intangible assets [member] Member ifrs-full:ComputerSoftwareMember
1779 Methods of generation [axis] Axis ifrs-full:MethodsOfGenerationAxis
1780 Methods of generation [member] Member ifrs-full:MethodsOfGenerationMember
1781 Internally generated [member] Member ifrs-full:InternallyGeneratedMember
1782 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
1783 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
1784 Payvision [member] Member ing:PayvisionMember
1785 Makelaarsland [Member] Member ing:MakelaarslandMember
1786 Individual assets or cash-generating units [axis] Axis ifrs-full:IndividualAssetsOrCashgeneratingUnitsAxis
1787 Entity's total for individual assets or cash-generating units [member] Member ifrs-full:EntitysTotalForIndividualAssetsOrCashgeneratingUnitsMember
1788 Wholesale Banking [member] Member ing:WholesaleBankingMember
1789 Retail Netherlands [Member] Member ing:RetailNetherlandsMember
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1791 Goodwill impairment Concept (Monetary) For Period ifrs-full:ImpairmentLossRecognisedInProfitOrLossGoodwill
1792 Description to measure fair value less costs of disposal Concept (Text/String) For Period ifrs-full:DescriptionOfValuationTechniquesUsedToMeasureFairValueLessCostsOfDisposal
1793 Bonds maturity year Concept (xbrli:durationItemType) For Period ing:BondsMaturityYear
1794 Intangible assets Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsOtherThanGoodwill
1795 Percentage of voting equity interests acquired Concept (Percent) As Of ifrs-full:PercentageOfVotingEquityInterestsAcquired
1796 Recognition of goodwill Concept (Monetary) For Period Debit ifrs-full:AdditionalRecognitionGoodwill
1797 041001 - Disclosure - Other Assets - Schedule of Other Assets by Type (Detail) Network

*

*

 http://www.ing.com/role/OtherAssetsScheduleOfOtherAssetsByTypeDetail
1798 Implied Table Table

*

*

 implied:Table
1799 Disclosure of other assets [abstract] Abstract ing:DisclosureOfOtherAssetsAbstract
1800 Net defined benefit assets Concept (Monetary) As Of Debit ifrs-full:RecognisedAssetsDefinedBenefitPlan
1801 Investment properties Concept (Monetary) As Of Debit ifrs-full:InvestmentProperty
1802 Property development and obtained from foreclosures Concept (Monetary) As Of Debit ing:PropertyDevelopmentAndForeclosures
1803 Accrued interest and rents Concept (Monetary) As Of Debit ing:AccruedInterestAndRents
1804 Other accrued assets Concept (Monetary) As Of Debit ing:OtherAccruedAssets
1805 Amounts to be settled Concept (Monetary) As Of Debit ing:AmountsToBeSettled
1806 Other Concept (Monetary) As Of Debit ing:MiscellaneousOtherAssets
1807 Other assets total Concept (Monetary) As Of Debit ifrs-full:OtherAssets
1808 041004 - Disclosure - Other Assets - Additional Information (Detail) Network

*

*

 http://www.ing.com/role/OtherAssetsAdditionalInformationDetail
1809 Disclosure of Other Assets [table] Table

*

*

 ing:DisclosureOfOtherAssetsTable
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1812 Trading Derivative Assets [member] Member ing:TradingDerivativeAssetsMember
1813 Categories of financial assets [axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
1814 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
1815 Loans and available-for-sale bonds [member] Member ing:LoansAndAvailableforsaleBondsMember
1816 Balance Sheet Location [Axis] Axis us-gaap:BalanceSheetLocationAxis
1817 Balance Sheet Location [Domain] Member us-gaap:BalanceSheetLocationDomain
1818 Other assets [member] Member ifrs-full:OtherAssetsMember
1819 Disclosure of Other Assets [line items] LineItems ing:DisclosureOfOtherAssetsLineItems
1820 Borrowing costs relating to Property development and obtained from foreclosures capitalised Concept (Monetary) For Period ifrs-full:BorrowingCostsIncurred
1821 Accrued interest Concept (Monetary) As Of Debit ifrs-full:InterestReceivable
1822 Other receivables Concept (Monetary) As Of Debit ifrs-full:OtherReceivables
1823 041101 - Disclosure - Deposits from Banks - Schedule of Deposits from Banks by Type (Detail) Network

*

*

 http://www.ing.com/role/DepositsFromBanksScheduleOfDepositsFromBanksByTypeDetail
1824 Disclosure Of Deposits From Banks [table] Table

*

*

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1826 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
1827 Netherlands [member] Member country:NL
1828 International [member] Member ifrs-full:ForeignCountriesMember
1829 Disclosure Of Deposits From Bank [Line Items] LineItems ing:DisclosureOfDepositsFromBankLineItems
1830 Non-interest bearing Concept (Monetary) As Of Credit ing:NonInterestBearingOnDepositsFromBanks
1831 Interest bearing Concept (Monetary) As Of Credit ing:InterestBearingOnDepositsFromBanks
1832 Deposits from banks Concept (Monetary) As Of Credit ifrs-full:DepositsFromBanks
1833 041102 - Disclosure - Deposits from Banks - Additional Information (Detail) Network

*

*

 http://www.ing.com/role/DepositsFromBanksAdditionalInformationDetail
1834 Implied Table Table

*

*

 implied:Table
1835 Disclosure of deposits from banks [abstract] Abstract ing:DisclosureOfDepositsFromBanksAbstract
1836 New targeted longer term refinancing operations Concept (Monetary) As Of Credit ing:NewTargetedLongerTermRefinancingOperations
1837 Early redeemed targeted longer term refinancing operations Concept (Monetary) As Of Credit ing:EarlyRedeemedTargetedLongerTermRefinancingOperations
1838 041201 - Disclosure - Customer Deposits - Schedule of Customer Deposits (Detail) Network

*

*

 http://www.ing.com/role/CustomerDepositsScheduleOfCustomerDepositsDetail
1839 Implied Table Table

*

*

 implied:Table
1840 Deposits from customers [abstract] Abstract ifrs-full:DepositsFromCustomersAbstract
1841 Savings accounts Concept (Monetary) As Of Credit ifrs-full:BalancesOnDemandDepositsFromCustomers
1842 Credit balances on customer accounts Concept (Monetary) As Of Credit ing:CustomerAccountsCreditBalances
1843 Corporate deposits Concept (Monetary) As Of Credit ing:CorporateDeposits
1844 Other Concept (Monetary) As Of Credit ifrs-full:BalancesOnOtherDepositsFromCustomers
1845 Customer deposits Concept (Monetary) As Of Credit ifrs-full:DepositsFromCustomers
1846 041202 - Disclosure - Customer Deposits - Schedule of Customer Deposits By Type (Detail) Network

*

*

 http://www.ing.com/role/CustomerDepositsScheduleOfCustomerDepositsByTypeDetail
1847 Disclosure of customer deposits [table] Table

*

*

 ing:DisclosureOfCustomerDepositsTable
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1849 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
1850 Netherlands [member] Member country:NL
1851 International [member] Member ifrs-full:ForeignCountriesMember
1852 Disclosure of customer deposits [line items] LineItems ing:DisclosureOfCustomerDepositsLineItems
1853 Non-interest bearing Concept (Monetary) As Of Credit ing:NonInterestBearingCustomerDeposits
1854 Interest bearing Concept (Monetary) As Of Credit ing:InterestBearingCustomerDeposits
1855 Customer deposits Concept (Monetary) As Of Credit ifrs-full:DepositsFromCustomers
1856 041301 - Disclosure - Financial Liabilities at Fair Value Through Profit or Loss - Financial Liabilities at Fair Value Through Profit or Loss (Detail) Network

*

*

 http://www.ing.com/role/FinancialLiabilitiesAtFairValueThroughProfitOrLossFinancialLiabilitiesAtFairValueThroughProfitOrLossDetail
1857 Implied Table Table

*

*

 implied:Table
1858 Disclosure of fair value measurement of liabilities [abstract] Abstract ifrs-full:DisclosureOfFairValueMeasurementOfLiabilitiesAbstract
1859 Trading liabilities Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossClassifiedAsHeldForTrading
1860 Non-trading derivatives Concept (Monetary) As Of Credit ing:CreditDerivativeFairValueLiabilities
1861 - designated as at fair value through profit or loss Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedAsUponInitialRecognition
1862 Financial Liabilities Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLoss
1863 041302 - Disclosure - Financial Liabilities at Fair Value Through Profit or Loss - Trading Liabilities by Type (Detail) Network

*

*

 http://www.ing.com/role/FinancialLiabilitiesAtFairValueThroughProfitOrLossTradingLiabilitiesByTypeDetail
1864 Disclosure of fair value measurement of liabilities [table] Table

*

*

 ifrs-full:DisclosureOfFairValueMeasurementOfLiabilitiesTable
1865 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
1866 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
1867 Derivatives [member] Member ifrs-full:DerivativesMember
1868 Unconsolidated structured entities [axis] Axis ifrs-full:UnconsolidatedStructuredEntitiesAxis
1869 Entity's total for unconsolidated structured entities [member] Member ifrs-full:EntitysTotalForUnconsolidatedStructuredEntitiesMember
1870 Funds on deposit [member] Member ifrs-full:InvestmentFundsMember
1871 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
1872 Assets [member] Member ifrs-full:ClassesOfAssetsMember
1873 Equity securities [member] Member ifrs-full:TradingEquitySecuritiesMember
1874 Debt securities [member] Member ifrs-full:DebtSecuritiesMember
1875 Disclosure of fair value measurement of liabilities [line items] LineItems ifrs-full:DisclosureOfFairValueMeasurementOfLiabilitiesLineItems
1876 Trading liabilities by type Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossClassifiedAsHeldForTrading
1877 041303 - Disclosure - Financial Liabilities at Fair Value Through Profit or Loss - Non-trading Derivatives by Type (Detail) Network

*

*

 http://www.ing.com/role/FinancialLiabilitiesAtFairValueThroughProfitOrLossNontradingDerivativesByTypeDetail
1878 Disclosure of fair value measurement of liabilities [table] Table

*

*

 ifrs-full:DisclosureOfFairValueMeasurementOfLiabilitiesTable
1879 Types of hedges [axis] Axis ifrs-full:TypesOfHedgesAxis
1880 Hedges [member] Member ifrs-full:TypesOfHedgesMember
1881 Fair value hedges [member] Member ifrs-full:FairValueHedgesMember
1882 Cash flow hedges [member] Member ifrs-full:CashFlowHedgesMember
1883 Hedges of net investments in foreign operations [member] Member ifrs-full:HedgesOfNetInvestmentInForeignOperationsMember
1884 Other non-trading derivatives [member] Member ing:OtherNontradingDerivativesMember
1885 Disclosure of fair value measurement of liabilities [line items] LineItems ifrs-full:DisclosureOfFairValueMeasurementOfLiabilitiesLineItems
1886 Non-trading derivatives by type Concept (Monetary) As Of Credit ing:CreditDerivativeFairValueLiabilities
1887 041304 - Disclosure - Financial Liabilities at Fair Value Through Profit or Loss - Summary of Designated as at Fair Value Through Profit or Loss by Type (Detail) Network

*

*

 http://www.ing.com/role/FinancialLiabilitiesAtFairValueThroughProfitOrLossSummaryOfDesignatedAsAtFairValueThroughProfitOrLossByTypeDetail
1888 Disclosure of fair value measurement of liabilities [table] Table

*

*

 ifrs-full:DisclosureOfFairValueMeasurementOfLiabilitiesTable
1889 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
1890 Assets [member] Member ifrs-full:ClassesOfAssetsMember
1891 Debt securities [member] Member ifrs-full:DebtSecuritiesMember
1892 Unconsolidated structured entities [axis] Axis ifrs-full:UnconsolidatedStructuredEntitiesAxis
1893 Entity's total for unconsolidated structured entities [member] Member ifrs-full:EntitysTotalForUnconsolidatedStructuredEntitiesMember
1894 Funds entrusted [member] Member ing:FundsEntrustedMember
1895 Subordinated liabilities [member] Member ing:SubordinatedLiabilitiesMember
1896 Disclosure of fair value measurement of liabilities [line items] LineItems ifrs-full:DisclosureOfFairValueMeasurementOfLiabilitiesLineItems
1897 Designated as at fair value through profit or loss by type Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedAsUponInitialRecognition
1898 041305 - Disclosure - Financial Liabilities at Fair Value Through Profit or Loss - Additional Information (Detail) Network

*

*

 http://www.ing.com/role/FinancialLiabilitiesAtFairValueThroughProfitOrLossAdditionalInformationDetail
1899 Implied Table Table

*

*

 implied:Table
1900 Disclosure of fair value measurement of liabilities [abstract] Abstract ifrs-full:DisclosureOfFairValueMeasurementOfLiabilitiesAbstract
1901 Fair value of financial liability, attributable to changes in credit risk of liability Concept (Monetary) For Period Credit ifrs-full:ChangesInFairValueOfFinancialLiabilityAttributableToChangesInCreditRiskOfLiability
1902 Fair value of financial liability, attributable to changes in credit risk of liability on cumulative basis Concept (Monetary) As Of Credit ifrs-full:AccumulatedChangesInFairValueOfFinancialLiabilityAttributableToChangesInCreditRiskOfLiability
1903 Financial liabilities Designated at fair value through profit or loss, previously reported as Trading liabilities Concept (Monetary) As Of Credit ing:FinancialLiabilitiesDesignatedAtFairValueThroughProfitOrLossPreviouslyReportedAsTradingLiabilities
1904 Reverse repurchase portfolios mandatorily at fair value through profit and loss Concept (Monetary) As Of Debit ing:ReverseRepurchasePortfoliosMandatorilyAtFairValueThroughProfitAndLoss
1905 Funds on deposit related to repurchase transactions Concept (Monetary) As Of Credit ing:FundsOnDepositRelatedToRepurchaseTransactions
1906 Funds entrusted related to repurchase transactions Concept (Monetary) As Of Credit ing:FundsEntrustedRelatedToRepurchaseTransactions
1907 Financial liabilities designated at fair value through profit or loss to pay at maturity to the holders Concept (Monetary) As Of ifrs-full:DifferenceBetweenCarryingAmountOfFinancialLiabilityAndAmountContractuallyRequiredToPayAtMaturityToHolderOfObligation
1908 041401 - Disclosure - Provisions - Summary of Provisions by Type (Detail) Network

*

*

 http://www.ing.com/role/ProvisionsSummaryOfProvisionsByTypeDetail
1909 Disclosure of other provisions [table] Table

*

*

 ifrs-full:DisclosureOfOtherProvisionsTable
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1911 Other provisions [member] Member ifrs-full:OtherProvisionsMember
1912 Reorganisation provisions [member] Member ifrs-full:RestructuringProvisionMember
1913 Other provisions [member] Member ifrs-full:MiscellaneousOtherProvisionsMember
1914 Disclosure of other provisions [line items] LineItems ifrs-full:DisclosureOfOtherProvisionsLineItems
1915 Other provisions Concept (Monetary) As Of Credit ifrs-full:OtherProvisions
1916 041402 - Disclosure - Provisions - Summary of Changes in Reorganisation Provisions (Detail) Network

*

*

 http://www.ing.com/role/ProvisionsSummaryOfChangesInReorganisationProvisionsDetail
1917 Disclosure of other provisions [table] Table

*

*

 ifrs-full:DisclosureOfOtherProvisionsTable
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1919 Other provisions [member] Member ifrs-full:OtherProvisionsMember
1920 Restructuring provision [member] Member ifrs-full:RestructuringProvisionMember
1921 Disclosure of other provisions [line items] LineItems ifrs-full:DisclosureOfOtherProvisionsLineItems
1922 Opening Balance Concept (Monetary) As Of Credit ifrs-full:OtherProvisions
1923 Additions Concept (Monetary) For Period Credit ifrs-full:AdditionalProvisionsOtherProvisions
1924 Interest Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughChangeInDiscountRateOtherProvisions
1925 Unused amounts reversed Concept (Monetary) For Period Debit ifrs-full:UnusedProvisionReversedOtherProvisions
1926 Utilised Concept (Monetary) For Period Debit ifrs-full:ProvisionUsedOtherProvisions
1927 Exchange rate or other movements Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughNetExchangeDifferencesOtherProvisions
1928 Other changes Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesOtherProvisions
1929 Closing balance Concept (Monetary) As Of Credit ifrs-full:OtherProvisions
1930 041403 - Disclosure - Provisions - Summary of Changes in Other Provisions (Detail) Network

*

*

 http://www.ing.com/role/ProvisionsSummaryOfChangesInOtherProvisionsDetail
1931 Disclosure of other provisions [table] Table

*

*

 ifrs-full:DisclosureOfOtherProvisionsTable
1932 Classes of other provisions [axis] Axis ifrs-full:ClassesOfProvisionsAxis
1933 Other Provisions [Member] Member ifrs-full:OtherProvisionsMember
1934 Other provisions [member] Member ifrs-full:MiscellaneousOtherProvisionsMember
1935 Litigation [member] Member ifrs-full:LegalProceedingsProvisionMember
1936 Other [member] Member ing:OtherMiscellaneousOtherProvisionsMember
1937 Disclosure of other provisions [line items] LineItems ifrs-full:DisclosureOfOtherProvisionsLineItems
1938 Opening Balance Concept (Monetary) As Of Credit ifrs-full:OtherProvisions
1939 Effects of changes in accounting policy Concept (Monetary) For Period Credit ing:EffectsOfChangesInAccountingPolicyOtherProvisions
1940 Additions Concept (Monetary) For Period Credit ifrs-full:AdditionalProvisionsOtherProvisions
1941 Interest Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughChangeInDiscountRateOtherProvisions
1942 Unused amounts reversed Concept (Monetary) For Period Debit ifrs-full:UnusedProvisionReversedOtherProvisions
1943 Utilised Concept (Monetary) For Period Debit ifrs-full:ProvisionUsedOtherProvisions
1944 Exchange rate or other movements Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughNetExchangeDifferencesOtherProvisions
1945 Other changes Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesOtherProvisions
1946 Closing balance Concept (Monetary) As Of Credit ifrs-full:OtherProvisions
1947 041404 - Disclosure - Provisions - Additional Information (Detail) Network

*

*

 http://www.ing.com/role/ProvisionsAdditionalInformationDetail
1948 Disclosure of Provisions [Table] Table

*

*

 ing:DisclosureOfProvisionsTable
1949 Classes of other provisions [axis] Axis ifrs-full:ClassesOfProvisionsAxis
1950 Other Provisions [Member] Member ifrs-full:OtherProvisionsMember
1951 Workforce reductions [member] Member ing:SeveranceMember
1952 Provision related to contingent liablities [Member] Member ing:ProvisionRelatedToContingentLiablitiesMember
1953 Credit replacement facilities [Member] Member ing:CreditReplacementFacilitiesMember
1954 Non credit replacement facilities [Member] Member ing:NonCreditReplacementFacilitiesMember
1955 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
1956 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
1957 Belgium and Netherlands [member] Member ing:BelgiumAndNetherlandsMember
1958 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
1959 Financial instruments, class [member] Member ifrs-full:ClassesOfFinancialInstrumentsMember
1960 Letters of credit / guarantees [member] Member ing:LettersOfCreditOrGuaranteesMember
1961 Disclosure of Provisions [Line Items] LineItems ing:DisclosureOfProvisionsLineItems
1962 Additions Concept (Monetary) For Period Credit ifrs-full:AdditionalProvisionsOtherProvisions
1963 Reorganisation provision, description Concept (Text/String) For Period ing:ReorganisationProvisionsDescription
1964 Other provisions Concept (Monetary) As Of Credit ifrs-full:OtherProvisions
1965 Other provisions, Amount expected to be settled within twelve months Concept (Monetary) As Of Credit ifrs-full:OtherShorttermProvisions
1966 041501 - Disclosure - Other Liabilities - Summary of Other Liabilities (Detail) Network

*

*

 http://www.ing.com/role/OtherLiabilitiesSummaryOfOtherLiabilitiesDetail
1967 Implied Table Table

*

*

 implied:Table
1968 Disclosure of other liabilities [abstract] Abstract ing:DisclosureOfOtherLiabilitiesAbstract
1969 Net defined benefit liability Concept (Monetary) As Of Credit ifrs-full:RecognisedLiabilitiesDefinedBenefitPlan
1970 Other post-employment benefits Concept (Monetary) As Of Credit ing:PensionAndOtherPostEmploymentBenefit
1971 Other staff-related liabilities Concept (Monetary) As Of Credit ing:OtherStaffRelatedLiabilities
1972 Other taxation and social security contributions Concept (Monetary) As Of Credit ifrs-full:CurrentPayablesOnSocialSecurityAndTaxesOtherThanIncomeTax
1973 Accrued interest Concept (Monetary) As Of Credit ing:AccruedExpenses
1974 Costs payable Concept (Monetary) As Of Credit ing:CostsPayable
1975 Share-based payment plan liabilities Concept (Monetary) As Of Credit ifrs-full:LiabilitiesFromSharebasedPaymentTransactions2011
1976 Amounts to be settled Concept (Monetary) As Of Credit ing:AmountOfClaimsSettled
1977 Other Concept (Monetary) As Of Credit ing:OtherLiabilitiesClassifiedAsOther
1978 Other liabilities Concept (Monetary) As Of Credit ifrs-full:OtherLiabilities
1979 041601 - Disclosure - Debt Securities in Issue - Summary of Maturities of Debt Securities in Issue (Detail) Network

*

*

 http://www.ing.com/role/DebtSecuritiesInIssueSummaryOfMaturitiesOfDebtSecuritiesInIssueDetail
1980 Disclosure of financial liabilities [table] Table

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*

 ifrs-full:DisclosureOfFinancialLiabilitiesTable
1981 Types of interest rates [axis] Axis ifrs-full:TypesOfInterestRatesAxis
1982 Interest rate types [member] Member ifrs-full:InterestRateTypesMember
1983 Fixed rate debt securities [member] Member ifrs-full:FixedInterestRateMember
1984 Floating rate debt securities [member] Member ifrs-full:FloatingInterestRateMember
1985 Maturity [axis] Axis ifrs-full:MaturityAxis
1986 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
1987 Within 1 year [member] Member ifrs-full:NotLaterThanOneYearMember
1988 More than 1 year but less than 2 years [member] Member ifrs-full:LaterThanOneYearAndNotLaterThanTwoYearsMember
1989 More than 2 years but less than 3 years [member] Member ifrs-full:LaterThanTwoYearsAndNotLaterThanThreeYearsMember
1990 More than 3 years but less than 4 years [member] Member ifrs-full:LaterThanThreeYearsAndNotLaterThanFourYearsMember
1991 More than 4 years but less than 5 years [member] Member ifrs-full:LaterThanFourYearsAndNotLaterThanFiveYearsMember
1992 More than 5 years [member] Member ifrs-full:LaterThanFiveYearsMember
1993 Disclosure of financial liabilities [line items] LineItems ifrs-full:DisclosureOfFinancialLiabilitiesLineItems
1994 Total debt securities Concept (Monetary) As Of Credit ifrs-full:DebtSecurities
1995 041602 - Disclosure - Debt Securities in Issue - Additional Information (Detail) Network

*

*

 http://www.ing.com/role/DebtSecuritiesInIssueAdditionalInformationDetail
1996 Disclosure of financial liabilities [table] Table

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*

 ifrs-full:DisclosureOfFinancialLiabilitiesTable
1997 Classes of liabilities [axis] Axis ifrs-full:ClassesOfLiabilitiesAxis
1998 Liabilities [member] Member ifrs-full:LiabilitiesMember
1999 Commercial paper [member] Member ing:CommercialPaper1Member
2000 Long term maturity bonds [member] Member ing:LongTermMaturityBondsMember
2001 Certificates of deposit [member] Member us-gaap:CertificatesOfDepositMember
2002 Covered bonds [member] Member ing:CoveredBondsMember
2003 Other debt securities [member] Member us-gaap:OtherDebtSecuritiesMember
2004 Debt securities in issue [Member] Member ing:DebtSecuritiesInIssueMember
2005 Disclosure of financial liabilities [line items] LineItems ifrs-full:DisclosureOfFinancialLiabilitiesLineItems
2006 Increase (decrease) in debt securities Concept (Monetary) For Period Credit ing:IncreaseDecreaseInDebtSecurities
2007 Unused line of credit including payment of borrowings related to debt securities Concept (Monetary) As Of Credit ifrs-full:UndrawnBorrowingFacilities
2008 Accrued interest debt securities in issue Concept (Monetary) As Of Credit ing:AccruedInterestDebtSecuritiesInIssue
2009 041701 - Disclosure - Subordinated loans - Schedule of Subordinated Loans by Group Companies (Detail) Network

*

*

 http://www.ing.com/role/SubordinatedLoansScheduleOfSubordinatedLoansByGroupCompaniesDetail
2010 Disclosure of detailed information about borrowings [table] Table

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 ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsTable
2011 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
2012 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
2013 ING Groep N.V. [member] Member ifrs-full:ParentMember
2014 ING Group Companies [member] Member ing:IngGroupCompaniesMember
2015 Disclosure of detailed information about borrowings [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
2016 Subordinated loans Concept (Monetary) As Of Credit ifrs-full:SubordinatedLiabilities
2017 041702 - Disclosure - Subordinated loans - Schedule of Changes In Subordinated Loans (Detail) Network

*

*

 http://www.ing.com/role/SubordinatedLoansScheduleOfChangesInSubordinatedLoansDetail
2018 Implied Table Table

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*

 implied:Table
2019 Disclosure of detailed information about borrowings [abstract] Abstract ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsAbstract
2020 Opening balance Concept (Monetary) As Of Credit ifrs-full:SubordinatedLiabilities
2021 Effect Of Changes In Accounting Policy Concept (Monetary) For Period Credit ing:EffectOfChangesInAccountingPolicySubordinatedLoansIFRS9
2022 New issuances Concept (Monetary) For Period Debit ifrs-full:ProceedsFromIssueOfSubordinatedLiabilities
2023 Repayments Concept (Monetary) For Period Credit ifrs-full:RepaymentsOfSubordinatedLiabilities
2024 Exchange rate differences and other Concept (Monetary) For Period Credit ing:ExchangeRateDifferencesAndOtherSubordinatedLiabilities
2025 Closing balance Concept (Monetary) As Of Credit ifrs-full:SubordinatedLiabilities
2026 041703 - Disclosure - Subordinated Loans - Additional Information (Detail) Network

*

*

 http://www.ing.com/role/SubordinatedLoansAdditionalInformationDetail
2027 Disclosure of detailed information about borrowings [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsTable
2028 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
2029 Assets [member] Member ifrs-full:ClassesOfAssetsMember
2030 Debt securities [member] Member ifrs-full:DebtSecuritiesMember
2031 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
2032 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
2033 Subordinated loans [member] Member ing:SubordinatedLoansMember
2034 Crr/crd iv additional tier 1 capital [member] Member ing:CRRCRDIVAdditionalTierCapitalMember
2035 Tier1 contingent convertible securities [member] Member ing:Tier1ContingentConvertibleSecuritiesMember
2036 Subordinated CRD IV Tier 2 securities [member] Member ing:SubordinatedCrdIvTierTwoMember
2037 Subordinated Tier 2 securities issued [Member] Member ing:SubordinatedTierTwoSecuritiesMember
2038 Other private placements [Member] Member ing:OtherPrivatePlacementsMember
2039 Perpetual 7.2% debt securities [Member] Member ing:PerpetualDebtSecuritiesSevenPointTwoPercentMember
2040 Perpetual 6.2% Debt Securities [Member] Member ing:PerpetualDebtSecuritiesSixPointTwoPercentMember
2041 Tier 1 instrument [Member] Member ing:TierOneInstrumentMember
2042 Tier 2 instrument [Member] Member ing:Tier2InstrumentMember
2043 Subordinated CRD IV Tier 2 notes March 2030 [Member] Member ing:SubordinatedCrdIvTier2NotesMarch2030Member
2044 Subordinated CRD IV Tier 2 notes March 2028 [Member] Member ing:SubordinatedCrdIvTier2NotesMarch2028Member
2045 Tier 2 Debt Securities 6.125% [member] Member ing:TierTwoDebtSecuritiesSixPointOneHundredTwentyFivePercentMember
2046 Tier 2 Debt Securities 6.875% [member] Member ing:TierTwoDebtSecuritiesSixPointEightHundredSeventyFivePercentMember
2047 Tier 2 Debt Securities 3.50% [member] Member ing:Tier2DebtSecurityThreePointFivePercentMember
2048 Tier 2 Debt Securities 4.125% [member] Member ing:Tier2DebtSecurityFourPointOneHundredAndTwentyFivePercentMember
2049 Disclosure of detailed information about borrowings [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
2050 Debt instruments issued Concept (Monetary) As Of Credit ifrs-full:DebtSecurities
2051 Debt instruments coupon rate Concept (Percent) As Of ing:DebtSecuritiesCouponRate
2052 Proceeds from private placement Concept (Monetary) For Period Debit ing:ProceedsFromIssuanceOfPrivatePlacementUnits
2053 Redemption of subordinated loans Concept (Monetary) For Period Credit ifrs-full:RepaymentsOfBondsNotesAndDebentures
2054 Redemption of subordinated loans Concept (Percent) As Of ifrs-full:BorrowingsInterestRate
2055 Average interest rate Concept (Percent) As Of ing:WeightedAverageInterestRate
2056 Interest expense on subordinated loans Concept (Monetary) For Period Debit ing:InterestExpenseOnSubordinatedLoans
2057 041801 - Disclosure - Equity - Summary of Equity (Detail) Network

*

*

 http://www.ing.com/role/EquitySummaryOfEquityDetail
2058 Disclosure of financial assets [table] Table

*

*

 ifrs-full:DisclosureOfFinancialAssetsTable
2059 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
2060 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
2061 Debt instruments at FVOCI [Member] Member ing:DebtInstrumentsFairValueOtherComprehensiveIncomeMember
2062 Equity securities at FVOCI [Member] Member ing:EquitySecuritiesAtFairValueThroughOtherComprehensiveIncomeMember
2063 Disclosure of financial assets [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsLineItems
2064 Revaluation reserves: financial assets Concept (Monetary) As Of Credit ifrs-full:ReserveOfGainsAndLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncome
2065 041801 - Disclosure - Equity - Summary of Equity (Detail) Network

*

*

 http://www.ing.com/role/EquitySummaryOfEquityDetail
2066 Implied Table Table

*

*

 implied:Table
2067 Disclosure Of Equity [abstract] Abstract ing:DisclosureOfEquityAbstract
2068 Total equity Abstract ifrs-full:EquityAbstract
2069 Share capital and share premium Abstract ing:ShareCapitalAndSharePremiumAbstract
2070 Share capital Concept (Monetary) As Of Credit ifrs-full:IssuedCapital
2071 Share premium Concept (Monetary) As Of Credit ifrs-full:SharePremium
2072 Total share capital and share premium Concept (Monetary) As Of Credit ing:ShareCapitalAndSharePremium
2073 Other reserves Abstract ifrs-full:OtherReservesAbstract
2074 Revaluation reserve: Available-for-sale and other Concept (Monetary) As Of Credit ifrs-full:ReserveOfGainsAndLossesOnRemeasuringAvailableforsaleFinancialAssets
2075 Revaluation reserve: Cash flow hedge Concept (Monetary) As Of Credit ifrs-full:ReserveOfCashFlowHedges
2076 Revaluation reserves credit liability Concept (Monetary) As Of Credit ing:RevaluationReservesCreditLiability
2077 Revaluation reserve: Property in own use Concept (Monetary) As Of Credit ing:ReserveOfPropertyInOwnUse
2078 Revaluation reserves Concept (Monetary) As Of Credit ing:RevaluationReservesFinancialAssetsAndLiabilities
2079 Net defined benefit asset/liability remeasurement reserve Concept (Monetary) As Of Credit ifrs-full:ReserveOfRemeasurementsOfDefinedBenefitPlans
2080 Currency translation reserve Concept (Monetary) As Of Credit ifrs-full:ReserveOfExchangeDifferencesOnTranslation
2081 - Share of associates and joint ventures and other Concept (Monetary) As Of Credit ing:ReserveFromShareOfChangesInEquitiesOfAssociatesAndJointVenture
2082 Treasury shares Concept (Monetary) As Of Debit ifrs-full:TreasuryShares
2083 Total other reserves Concept (Monetary) As Of Credit ifrs-full:OtherReserves
2084 Retained earnings Concept (Monetary) As Of Credit ifrs-full:RetainedEarnings
2085 Shareholders' equity (parent) Concept (Monetary) As Of Credit ifrs-full:EquityAttributableToOwnersOfParent
2086 Non-controlling interests Concept (Monetary) As Of Credit ifrs-full:NoncontrollingInterests
2087 Equity Concept (Monetary) As Of Credit ifrs-full:Equity
2088 041802 - Disclosure - Equity - Schedule of Share Capital (Detail) Network

*

*

 http://www.ing.com/role/EquityScheduleOfShareCapitalDetail
2089 Implied Table Table

*

*

 implied:Table
2090 Disclosure of classes of share capital [abstract] Abstract ifrs-full:DisclosureOfClassesOfShareCapitalAbstract
2091 Authorised share capital, ordinary shares Concept (Shares) As Of ifrs-full:NumberOfSharesAuthorised
2092 Unissued share capital, ordinary shares Concept (Shares) For Period ing:UnissuedSharesNumber
2093 Issued share capital, ordinary shares Concept (Shares) As Of ifrs-full:NumberOfSharesIssued
2094 Authorised share capital, amount Concept (Monetary) As Of Credit ing:SharesAuthorizedValue
2095 Unissued share capital, amount Concept (Monetary) As Of Debit ing:UnissuedSharesValue
2096 Issued share capital, amount Concept (Monetary) As Of Credit ifrs-full:IssuedCapital
2097 041803 - Disclosure - Equity - Summary of Changes in Issued share Capital (Detail) Network

*

*

 http://www.ing.com/role/EquitySummaryOfChangesInIssuedShareCapitalDetail
2098 Implied Table Table

*

*

 implied:Table
2099 Equity [abstract] Abstract ifrs-full:EquityAbstract
2100 Reconciliation of number of shares outstanding [abstract] Abstract ifrs-full:ReconciliationOfNumberOfSharesOutstandingAbstract
2101 Beginning balance, ordinary shares Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
2102 Issue of shares Concept (Shares) For Period ifrs-full:IncreaseDecreaseInNumberOfSharesOutstanding
2103 Ending balance, ordinary shares Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
2104 Beginning balance, amount Concept (Monetary) As Of Credit ifrs-full:IssuedCapital
2105 Transfer to share premium Concept (Monetary) For Period Credit ing:TransferToFromSharePremiumValue
2106 Issue of shares Concept (Monetary) For Period Credit ifrs-full:IssueOfEquity
2107 Ending balance, amount Concept (Monetary) As Of Credit ifrs-full:IssuedCapital
2108 041804 - Disclosure - Equity - Schedule of Share Premium (Detail) Network

*

*

 http://www.ing.com/role/EquityScheduleOfSharePremiumDetail
2109 Implied Table Table

*

*

 implied:Table
2110 Equity [abstract] Abstract ifrs-full:EquityAbstract
2111 Opening balance Concept (Monetary) As Of Credit ifrs-full:SharePremium
2112 Issue of shares Concept (Monetary) For Period Credit ing:IssueOfSharePremiumValue
2113 Transfer from issued share capital Concept (Monetary) For Period Credit ing:TransferFromIssuedShareCapital
2114 Closing balance Concept (Monetary) As Of Credit ifrs-full:SharePremium
2115 041805 - Disclosure - Equity - Schedule of Changes in Revaluation Reserve (Detail) Network

*

*

 http://www.ing.com/role/EquityScheduleOfChangesInRevaluationReserveDetail
2116 Disclosure of reserves within equity [table] Table

*

*

 ifrs-full:DisclosureOfReservesWithinEquityTable
2117 Reserves within equity [axis] Axis ifrs-full:ReservesWithinEquityAxis
2118 Other reserves [member] Member ifrs-full:OtherReservesMember
2119 Available-for-Sale and Other [member] Member ifrs-full:ReserveOfGainsAndLossesOnRemeasuringAvailableforsaleFinancialAssetsMember
2120 Reserve of gain loss FVOCI [member] Member ifrs-full:ReserveOfGainsAndLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeMember
2121 Cash flow hedge [member] Member ifrs-full:ReserveOfCashFlowHedgesMember
2122 Credit liability [member] Member ifrs-full:ReserveOfChangeInFairValueOfFinancialLiabilityAttributableToChangeInCreditRiskOfLiabilityMember
2123 Reserve of property in own use [Member] Member ing:ReserveOfProertyInUseMember
2124 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
2125 Assets [member] Member ifrs-full:ClassesOfAssetsMember
2126 Equity securities [member] Member ifrs-full:EquityInvestmentsMember
2127 Debt instruments [Member] Member ing:DebtInstrumentsMember
2128 Disclosure of reserves within equity [Line Items] LineItems ifrs-full:DisclosureOfReservesWithinEquityLineItems
2129 Opening balance Concept (Monetary) As Of Credit ifrs-full:OtherReserves
2130 Effect of changes in accounting policy Concept (Monetary) For Period Debit ing:EffectOfChangesInAccountingPolicyIFRS9
2131 Hedging gains and losses recognised in OCI Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeBeforeTaxGainsLossesOnHedgingInstrumentsThatHedgeInvestmentsInEquityInstruments
2132 Amounts transferred to the statement of profit or loss Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax
2133 Changes in revaluation reserve Concept (Monetary) For Period Credit ing:ChangesInRevaluationReserve
2134 Changes in credit liability reserve Concept (Monetary) For Period Credit ing:ChangesInCreditLiabilityReserve
2135 Unrealised revaluations Concept (Monetary) For Period Debit ing:IncreaseDecreaseInUnrealisedRevaluations
2136 Realised gains/losses transferred to the statement of profit or loss Concept (Monetary) For Period Credit ing:GainLossOnRealizedTransferredToTheStatementOfProfitOrLoss
2137 Transfer to insurance liabilities/DAC Concept (Monetary) For Period Credit ing:TransferToFromInsuranceLiabilities
2138 Impact of deconsolidation of NN Group Concept (Monetary) For Period Credit ing:ChangesInDeconsolidation
2139 Impact of partial divestment of NN Group Concept (Monetary) For Period Credit ing:ChangesInValueOfPartialDivestment
2140 Changes in composition of the group and other changes Concept (Monetary) For Period Debit ing:IncreaseDecreaseInCompositionOfGroupAndOtherChanges
2141 Closing balance Concept (Monetary) As Of Credit ifrs-full:OtherReserves
2142 041806 - Disclosure - Equity - Schedule of Changes in Currency Translation Reserve (Detail) Network

*

*

 http://www.ing.com/role/EquityScheduleOfChangesInCurrencyTranslationReserveDetail
2143 Disclosure of reserves within equity [table] Table

*

*

 ifrs-full:DisclosureOfReservesWithinEquityTable
2144 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
2145 Equity [member] Member ifrs-full:EquityMember
2146 Currency translation reserve [member] Member ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember
2147 Disclosure of reserves within equity [Line Items] LineItems ifrs-full:DisclosureOfReservesWithinEquityLineItems
2148 Opening balance Concept (Monetary) As Of Credit ifrs-full:OtherReserves
2149 Unrealised revaluations Concept (Monetary) For Period Debit ing:IncreaseDecreaseInUnrealisedRevaluations
2150 Realised gains/losses transferred to the statement of profit or loss Concept (Monetary) For Period Credit ing:GainLossOnRealizedTransferredToTheStatementOfProfitOrLoss
2151 Impact of deconsolidation of NN Group Concept (Monetary) For Period Credit ing:ChangesInDeconsolidation
2152 Impact of partial divestment of NN Group Concept (Monetary) For Period Credit ing:ChangesInValueOfPartialDivestment
2153 Impact of IPO NN Group Concept (Monetary) For Period Credit ing:ChangeInValueOfInitialPublicOffering
2154 Exchange rate differences Concept (Monetary) For Period Credit ing:IncreaseDecreaseInRate
2155 Closing balance Concept (Monetary) As Of Credit ifrs-full:OtherReserves
2156 041807 - Disclosure - Equity - Schedule of Changes in share of associates, joint ventures and other reserves (Detail) Network

*

*

 http://www.ing.com/role/EquityScheduleOfChangesInShareOfAssociatesJointVenturesAndOtherReservesDetail
2157 Implied Table Table

*

*

 implied:Table
2158 Equity [abstract] Abstract ifrs-full:EquityAbstract
2159 Opening balance Concept (Monetary) As Of Credit ing:ShareOfAssociatesJointVenturesAndOtherReserves
2160 Effect of changes in accounting policy Concept (Monetary) For Period Credit ing:EffectOfChangesInAccountingPolicyIfrs9AssociatesJointVentures
2161 Result for the year Concept (Monetary) For Period Credit ing:ChangesInResult
2162 Transfer to/from retained earnings Concept (Monetary) For Period Credit ing:ChangesInTransferToOrFromRetainedEarnings
2163 Changes in composition of the group and other changes Concept (Monetary) For Period Credit ing:IncreaseDecreaseThroughChangesInCompositionOfTheGroupAndOtherChangesRelatedToAssociatesAndJointVentures
2164 Closing balance Concept (Monetary) As Of Credit ing:ShareOfAssociatesJointVenturesAndOtherReserves
2165 041808 - Disclosure - Equity - Schedule of Changes in Treasury Shares (Detail) Network

*

*

 http://www.ing.com/role/EquityScheduleOfChangesInTreasurySharesDetail
2166 Disclosure of reserves within equity [table] Table

*

*

 ifrs-full:DisclosureOfReservesWithinEquityTable
2167 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
2168 Equity [member] Member ifrs-full:EquityMember
2169 Treasury Shares [member] Member ifrs-full:TreasurySharesMember
2170 Disclosure of reserves within equity [Line Items] LineItems ifrs-full:DisclosureOfReservesWithinEquityLineItems
2171 Opening balance Concept (Shares) As Of ing:NumberOfTreasuryShares
2172 Purchased/sold Concept (Shares) For Period ing:PurchaseOrSoldOfTreasuryShares
2173 Share-based payments Concept (Shares) For Period ing:ReserveOfSharebasedPaymentsShares
2174 Closing balance Concept (Shares) As Of ing:NumberOfTreasuryShares
2175 Opening balance Concept (Monetary) As Of Debit ifrs-full:TreasuryShares
2176 Purchased/sold Concept (Monetary) As Of Credit ing:PurchaseOrSoldOfTreasuryStock
2177 Closing balance Concept (Monetary) As Of Debit ifrs-full:TreasuryShares
2178 041809 - Disclosure - Equity - Schedule of Changes in Retained Earnings (Details) Network

*

*

 http://www.ing.com/role/EquityScheduleOfChangesInRetainedEarningsDetails
2179 Disclosure of reserves within equity [table] Table

*

*

 ifrs-full:DisclosureOfReservesWithinEquityTable
2180 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
2181 Equity [member] Member ifrs-full:EquityMember
2182 Retained earnings [member] Member ifrs-full:RetainedEarningsMember
2183 Statement Of Changes In Equity [Line Items] LineItems ifrs-full:StatementOfChangesInEquityLineItems
2184 Retained earnings, opening balance Concept (Monetary) As Of Credit ifrs-full:RetainedEarnings
2185 Effect of changes in accounting policy Concept (Monetary) For Period Debit ing:EffectOfChangesInAccountingPolicyIFRS9
2186 Transfer to/from share of associates and joint ventures reserves Concept (Monetary) For Period Credit ing:TransferToFromShareOfAssociatesAndJointVenturesReserves
2187 Results for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOrdinaryEquityHoldersOfParentEntity
2188 Impact of partial divestment of NN Group Concept (Monetary) For Period Credit ing:ChangesInValueOfPartialDivestment
2189 Cash dividend paid Concept (Monetary) For Period Debit ifrs-full:DividendsPaid
2190 Coupon on Undated subordinated notes issued by NN Group Concept (Monetary) For Period Debit ing:CouponOnUndatedSubordinatedNotesIssued
2191 Employee stock options and share plans Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions
2192 Changes in composition of the group and other changes Concept (Monetary) For Period Credit ing:ChangesInCompositionAndOther
2193 Retained earings, closing balance Concept (Monetary) As Of Credit ifrs-full:RetainedEarnings
2194 041810 - Disclosure - Equity - Schedule of Non-distributable reserves (Detail) Network

*

*

 http://www.ing.com/role/EquityScheduleOfNondistributableReservesDetail
2195 Disclosure of reserves within equity [table] Table

*

*

 ifrs-full:DisclosureOfReservesWithinEquityTable
2196 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
2197 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
2198 ING Bank [member] Member ifrs-full:SubsidiariesMember
2199 Other [member] Member ing:OtherBankMember
2200 Disclosure of reserves within equity [Line Items] LineItems ifrs-full:DisclosureOfReservesWithinEquityLineItems
2201 Non-distributable reserves Concept (Monetary) As Of Debit ing:NonDistributableReserves
2202 041811 - Disclosure - Equity - Additional Information (Detail) Network

*

*

 http://www.ing.com/role/EquityAdditionalInformationDetail
2203 Disclosure of equity [Table] Table

*

*

 ing:DisclosureOfEquityTable
2204 Assets and liabilities classified as held for sale [axis] Axis ifrs-full:AssetsAndLiabilitiesClassifiedAsHeldForSaleAxis
2205 Assets and liabilities not classified as held for sale [member] Member ifrs-full:AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember
2206 Available-for-sale and other [member] Member ing:AvailableForSaleAndOtherMember
2207 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
2208 Equity [member] Member ifrs-full:EquityMember
2209 Retained earnings [member] Member ifrs-full:RetainedEarningsMember
2210 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
2211 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
2212 Stichting Regio Bank and Stichting Vakbondsspaarbank SPN [member] Member ing:StichtingRegioBankAndStichtingVakbondsspaarbankSpnMember
2213 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
2214 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
2215 NN Group [member] Member ing:NNGroupMember
2216 ING Group [member] Member ing:INGGroupMember
2217 Associates [axis] Axis ifrs-full:SignificantInvestmentsInAssociatesAxis
2218 Entity's total for associates [member] Member ifrs-full:EntitysTotalForAssociatesMember
2219 Bank of Beijing [member] Member ing:BankOfBeijingMember
2220 Kotak Mahindra Bank [member] Member ing:KotakMahindraBankMember
2221 Range [axis] Axis ifrs-full:RangeAxis
2222 Ranges [member] Member ifrs-full:RangesMember
2223 Maximum [member] Member ifrs-full:TopOfRangeMember
2224 Minimum [member] Member ifrs-full:BottomOfRangeMember
2225 Classes of share capital [axis] Axis ifrs-full:ClassesOfShareCapitalAxis
2226 Share capital [member] Member ifrs-full:ClassesOfShareCapitalMember
2227 Ordinary shares [member] Member ing:OrdinaryShareMember
2228 Cumulative preference shares [member] Member ing:CumulativePreferenceSharesMember
2229 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
2230 Assets [member] Member ifrs-full:ClassesOfAssetsMember
2231 Equity investments [member] Member ifrs-full:EquityInvestmentsMember
2232 Reserves within equity [axis] Axis ifrs-full:ReservesWithinEquityAxis
2233 Other reserves [member] Member ifrs-full:OtherReservesMember
2234 Reserve of property in own use [Member] Member ing:ReserveOfProertyInUseMember
2235 Disclosure of equity [Line Items] LineItems ing:DisclosureOfEquityLineItems
2236 Number of Shares issued Concept (Shares) As Of ifrs-full:NumberOfSharesIssued
2237 Deposits receipts for ordinary shares issued Concept (Monetary) For Period Debit ifrs-full:ProceedsFromIssueOfOrdinaryShares
2238 Descriptions deposits receipts for ordinary shares converted Concept (Date) For Period ing:DescriptionsDepositsReceiptsForOrdinarySharesConverted
2239 Par value per share Concept (Share) As Of ifrs-full:ParValuePerShare
2240 Transfer To From Share Premium Value Concept (Monetary) For Period Credit ing:TransferToFromSharePremiumValue
2241 Issue of contingent convertible capital securities Concept (Monetary) For Period Credit ifrs-full:IssueOfConvertibleInstruments
2242 Share capital Concept (Shares) For Period ifrs-full:IncreaseDecreaseInNumberOfOrdinarySharesIssued
2243 Shares issued and fully paid Concept (Shares) As Of ifrs-full:NumberOfSharesIssuedAndFullyPaid
2244 Percentage of issued ordinary shares held in subsidiary Concept (Percent) For Period ing:PercentageOfOrdinaryShareCapital
2245 Exchange transaction fee per each depository receipt Concept (Monetary) For Period Debit ifrs-full:BrokerageFeeExpense
2246 Number of ordinary shares held in entity or its subsidiaries Concept (Shares) As Of ifrs-full:SharesInEntityHeldByEntityOrByItsSubsidiariesOrAssociates
2247 Administrative fee per depositary receipt Concept (Monetary) As Of ing:AdministrativeFeePerDepositaryReceipt
2248 Administrative Fee Per Exchange transaction Concept (Monetary) As Of ing:AdministrativeFeePerExchangeTransaction
2249 Number of depository receipts for ordinary shares held in entity or its subsidiaries Concept (Shares) For Period ing:DepositoryReceiptsForOrdinarySharesInEntityHeldByEntityOrByItsSubsidiariesOrAssociates
2250 Increase in share premium Concept (Monetary) As Of Credit ing:IncreaseDecreaseInSharePremium
2251 Increase (decrease) in revaluation reserves Concept (Monetary) As Of Credit ing:IncreaseDecreaseInRevaluationReserve
2252 Revaluation reserve: Available-for-sale and other Concept (Monetary) As Of Credit ifrs-full:ReserveOfGainsAndLossesOnRemeasuringAvailableforsaleFinancialAssets
2253 FVOCI revaluation reserve Concept (Monetary) As Of Credit ifrs-full:ReserveOfGainsAndLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncome
2254 Transfer of revaluation reserve to retained earnings Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughTransferBetweenRevaluationReserveAndRetainedEarnings
2255 Net decrease in currency translation reserve Concept (Monetary) As Of Credit ifrs-full:ReserveOfChangeInValueOfForeignCurrencyBasisSpreads
2256 Cash dividend paid Concept (Monetary) For Period Debit ifrs-full:DividendsPaid
2257 Tenure of undated subordinated notes coupon payments Concept (Text/String) For Period ing:TenureOfCouponPayments
2258 Decrease in Non-controlling interests Concept (Monetary) For Period Credit ing:IncreaseDecreaseInNoncontrollingInterests
2259 Reserve for dividend and repayment of capital Concept (Monetary) As Of Credit ifrs-full:CapitalReserve
2260 Increased dividend percentage Concept (Percent) For Period ing:IncreaseDividendAsPercentage
2261 041901 - Disclosure - Net Interest Income - Summary of Net Interest Income (Detail) Network

*

*

 http://www.ing.com/role/NetInterestIncomeSummaryOfNetInterestIncomeDetail
2262 Implied Table Table

*

*

 implied:Table
2263 Net Interest Income [Abstract] Abstract ing:NetInterestIncomeAbstract
2264 Interest income on loans Concept (Monetary) For Period Credit ifrs-full:InterestIncomeOnDebtInstrumentsHeld
2265 Interest income on financial assets at fair value through OCI Concept (Monetary) For Period Credit ifrs-full:InterestRevenueForFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncome
2266 Interest income on financial assets at amortised cost Concept (Monetary) For Period Credit ifrs-full:InterestIncomeForFinancialAssetsMeasuredAtAmortisedCost
2267 Interest income on non-trading derivatives (hedge accounting) Concept (Monetary) For Period Credit ing:InterestIncomeOnNonTradingDerivativesHedgeAccountingIfrs9
2268 Negative interest on liabilities Concept (Monetary) For Period Credit ing:NegativeInterestIncomeOnLiabilities
2269 Interest income Concept (Monetary) For Period Credit ifrs-full:InterestRevenueCalculatedUsingEffectiveInterestMethod
2270 Interest income on financial assets at fair value through profit or loss Concept (Monetary) For Period Credit ifrs-full:InterestIncomeOnFinancialAssetsDesignatedAtFairValueThroughProfitOrLoss
2271 Interest income on investments Concept (Monetary) For Period Credit ing:InterestIncomeOnInvestments
2272 Interest income on trading derivatives Concept (Monetary) For Period Credit ing:InterestIncomeOnTradingDerivatives
2273 Interest income on other trading portfolio Concept (Monetary) For Period Credit ing:InterestIncomeOnOtherAssetsHeldForTrading
2274 Interest income on non-trading derivatives (no hedge accounting) Concept (Monetary) For Period Credit ing:InterestIncomeOnNonTradingDerivativesNotQualifiedForHedgeAccounting
2275 Interest income on non-trading derivatives (hedge accounting) Concept (Monetary) For Period Credit ing:InterestIncomeOnNonTradingDerivativesQualifiedForHedgeAccounting
2276 Interest income other Concept (Monetary) For Period Credit ing:MiscellaneousInterestIncome
2277 Other interest income Concept (Monetary) For Period Credit ifrs-full:InterestIncomeOnOtherFinancialAssets
2278 Total Interest income 21 Concept (Monetary) For Period Credit ifrs-full:RevenueFromInterest
2279 Interest expense on deposits from banks Concept (Monetary) For Period Debit ifrs-full:InterestExpenseOnDepositsFromBanks
2280 Interest expense on customer deposits Concept (Monetary) For Period Debit ifrs-full:InterestExpenseOnDepositsFromCustomers
2281 Interest expense on debt securities in issue Concept (Monetary) For Period Debit ifrs-full:InterestExpenseOnDebtInstrumentsIssued
2282 Interest expense on subordinated loans Concept (Monetary) For Period Debit ing:InterestExpenseOnSubordinatedLoans
2283 Negative interest on assets Concept (Monetary) For Period Debit ing:NegativeInterestExpenseOnAssets
2284 Interest expense on non-trading derivatives (hedge accounting) Concept (Monetary) For Period Debit ing:InterestExpenseOnNonTradingDerivativesQualifiedForHedgeAccounting
2285 Interest expense using effective interest rate method Concept (Monetary) For Period Debit ing:InterestExpensesCalculatedUsingEffectiveInterestMethod
2286 Interest expense on financial liabilities at fair value through profit or loss Concept (Monetary) For Period Debit ifrs-full:InterestExpenseOnFinancialLiabilitiesDesignatedAtFairValueThroughProfitOrLoss
2287 Interest expense on trading derivatives Concept (Monetary) For Period Debit ing:InterestExpenseOnTradingDerivatives
2288 Interest expense on other trading liabilities Concept (Monetary) For Period Debit ing:InterestExpenseOnOtherTradingLiabilities
2289 Interest expense on non-trading derivatives (no hedge accounting) Concept (Monetary) For Period Debit ing:InterestExpenseOnNonTradingDerivativesNotQualifiedForHedgeAccounting
2290 Interest expense other Concept (Monetary) For Period Debit ing:MiscellaneousInterestExpense
2291 Other interest expense Concept (Monetary) For Period Debit ifrs-full:InterestExpenseOnOtherFinancialLiabilities
2292 Interest expense Concept (Monetary) For Period Debit ifrs-full:InterestExpense
2293 Net interest income Concept (Monetary) For Period Credit ifrs-full:InterestRevenueExpense
2294 Interest income on impaired loans Concept (Monetary) For Period Credit ifrs-full:InterestIncomeOnImpairedFinancialAssetsAccrued
2295 Interest income on loans and receivables Concept (Monetary) For Period Credit ifrs-full:InterestIncomeOnLoansAndReceivables
2296 Interest income on available-for-salesecurities Concept (Monetary) For Period Credit ifrs-full:InterestIncomeOnAvailableforsaleFinancialAssets
2297 Interest income on held-to-maturity securities Concept (Monetary) For Period Credit ifrs-full:InterestIncomeOnHeldtomaturityInvestments
2298 041902 - Disclosure - Net interest income - Impact of adoption of IFRS 9 on interest income and and expense presentation (Details) Network

*

*

 http://www.ing.com/role/NetInterestIncomeImpactOfAdoptionOfIFRS9OnInterestIncomeAndAndExpensePresentationDetails
2299 Disclosure of initial application of standards or interpretations [table] Table

*

*

 ifrs-full:DisclosureOfInitialApplicationOfStandardsOrInterpretationsTable
2300 Initially applied IFRSs [axis] Axis ifrs-full:InitiallyAppliedIFRSsAxis
2301 Initially applied IFRSs [member] Member ifrs-full:InitiallyAppliedIFRSsMember
2302 In accordance with IFRS 9 [member] Member ifrs-full:InAccordanceWithIFRS9Member
2303 Retrospective application and retrospective restatement [axis] Axis ifrs-full:RetrospectiveApplicationAndRetrospectiveRestatementAxis
2304 Currently stated [member] Member ifrs-full:RestatedMember
2305 Increase (decrease) due to changes in accounting policy [member] Member ifrs-full:FinancialEffectOfChangesInAccountingPolicyMember
2306 Reclassification of interest related to trading assets or liabilities [Member] Member ing:ReclassificationOfInterestRelateedToTradingAssetsOrLiabilitiesMember
2307 2017 on comparable basis to 2018[member] Member ing:OtherReclassificationsRelatedToIfrs9Member
2308 Disclosure of initial application of standards or interpretations [line items] LineItems ifrs-full:DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems
2309 Interest income Concept (Monetary) For Period Credit ifrs-full:RevenueFromInterest
2310 Interest expense Concept (Monetary) For Period Debit ifrs-full:InterestExpense
2311 Net Interest Income Concept (Monetary) For Period Credit ifrs-full:InterestRevenueExpense
2312 Valuation results and net trading income 22 Concept (Monetary) For Period Credit ifrs-full:TradingIncomeExpense
2313 041903 - Disclosure - Net Interest Income - Additional Information (Detail) Network

*

*

 http://www.ing.com/role/NetInterestIncomeAdditionalInformationDetail
2314 Implied Table Table

*

*

 implied:Table
2315 Net Interest Income [Abstract] Abstract ing:NetInterestIncomeAbstract
2316 Increase in total average assets on net interest income Concept (Monetary) For Period Debit ing:IncreaseInAverageAssetsOnNetInterestIncome
2317 Net interest income Concept (Monetary) For Period Credit ing:NetInterestIncomeIncludingOtherInterestIncomeExpense
2318 042001 - Disclosure - Net Fee and commission Income - Schedule of Fee and Commission Income (Detail) Network

*

*

 http://www.ing.com/role/NetFeeAndCommissionIncomeScheduleOfFeeAndCommissionIncomeDetail
2319 Implied Table Table

*

*

 implied:Table
2320 Fee and commission income (expense) [abstract] Abstract ifrs-full:FeeAndCommissionIncomeExpenseAbstract
2321 Funds transfer Concept (Monetary) For Period Credit ing:FundTransferFeeAndCommissionIncome
2322 Securities business Concept (Monetary) For Period Credit ing:SecuritiesBusinessFeeAndCommissionIncome
2323 Insurance broking Concept (Monetary) For Period Credit ing:InsuranceBrokingFeeAndCommissionIncome
2324 Asset management fees Concept (Monetary) For Period Credit ifrs-full:PortfolioAndOtherManagementFeeIncome
2325 Brokerage and advisory fees Concept (Monetary) For Period Credit ifrs-full:BrokerageFeeIncome
2326 Other Concept (Monetary) For Period Credit ifrs-full:OtherFeeAndCommissionIncome
2327 Total Fee and commission income Concept (Monetary) For Period Credit ifrs-full:FeeAndCommissionIncome
2328 042002 - Disclosure - Net Fee and commission Income - Schedule of Fee and Commission Expense (Detail) Network

*

*

 http://www.ing.com/role/NetFeeAndCommissionIncomeScheduleOfFeeAndCommissionExpenseDetail
2329 Implied Table Table

*

*

 implied:Table
2330 Fee and commission expense [abstract] Abstract ifrs-full:FeeAndCommissionExpenseAbstract
2331 Funds transfer Concept (Monetary) For Period Debit ing:FundTransferFeeAndCommissionExpense
2332 Securities business Concept (Monetary) For Period Debit ing:SecuritiesBusinessFeeAndCommissionExpense
2333 Insurance broking Concept (Monetary) For Period Debit ing:InsuranceBrokingFeeAndCommissionExpense
2334 Asset management fees Concept (Monetary) For Period Debit ing:AssetManagementFeeAndCommissionExpenseCredit
2335 Brokerage and advisory fees Concept (Monetary) For Period Debit ifrs-full:BrokerageFeeExpense
2336 Other Concept (Monetary) For Period Debit ifrs-full:OtherFeeAndCommissionExpense
2337 Total fee and commission expenses Concept (Monetary) For Period Debit ifrs-full:FeeAndCommissionExpense
2338 042003 - Disclosure - Net Fee and commission Income - Additional Information (Detail) Network

*

*

 http://www.ing.com/role/NetFeeAndCommissionIncomeAdditionalInformationDetail
2339 Implied Table Table

*

*

 implied:Table
2340 Fee and commission income (expense) [abstract] Abstract ifrs-full:FeeAndCommissionIncomeExpenseAbstract
2341 Bank guarantees fee and commission income Concept (Monetary) For Period Credit ing:BankGuaranteesFeeAndCommissionIncome
2342 Underwriting syndication loans fee and commission income Concept (Monetary) For Period Credit ing:UnderwritingSyndicationLoansFeeAndCommissionIncome
2343 Structured finance fee and commission income Concept (Monetary) For Period Credit ing:StructuredFinanceFeeAndCommissionIncome
2344 Collective instruments distribution fee and commission income Concept (Monetary) For Period Credit ing:CollectiveInstrumentsDistributionFeeAndCommissionIncome
2345 042101 - Disclosure - Valuation Results and Net Trading Income - Summary of Valuation Results and Net Trading Income (Detail) Network

*

*

 http://www.ing.com/role/ValuationResultsAndNetTradingIncomeSummaryOfValuationResultsAndNetTradingIncomeDetail
2346 Implied Table Table

*

*

 implied:Table
2347 Valuation Results And Net Trading Income [Abstract] Abstract ing:ValuationResultsAndNetTradingIncomeAbstract
2348 Securities trading results Concept (Monetary) For Period Credit ing:TradingIncomeExpenseOnSecurities
2349 Derivatives trading results Concept (Monetary) For Period Credit ifrs-full:TradingIncomeExpenseOnDerivativeFinancialInstruments
2350 Change in fair value of derivatives relating to Abstract ing:ChangeInFairValueOfDerivativesRelatingAbstract
2351 - fair value hedges Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnChangeInFairValueOfDerivatives
2352 - cash flow hedges (ineffective portion) Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnIneffectivenessOfCashFlowHedgesRecognisedInProfitOrLoss
2353 - other non-tradingderivatives Concept (Monetary) For Period Credit ing:GainsOnChangeInFairValueOfOtherNonTradingDerivatives
2354 Change in fair value of assets and liabilities (hedged items) Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnHedgedItemAttributableToHedgedRisk
2355 Valuation results on assets and liabilities designated at FVPL (excluding trading) Concept (Monetary) For Period Credit ing:GainsLossesOnAssetsAndLiabilitiesDesignatedAtFairValueThroughProfitOrLossExcludingTrading
2356 Foreign exchange transactions results Concept (Monetary) For Period Credit ifrs-full:TradingIncomeExpenseOnForeignExchangeContracts
2357 Other Concept (Monetary) For Period Credit ifrs-full:OtherTradingIncomeExpense
2358 Valuation results and net trading income 21 Concept (Monetary) For Period Credit ifrs-full:TradingIncomeExpense
2359 042102 - Disclosure - Valuation Results and Net Trading Income - Additional Information (Detail) Network

*

*

 http://www.ing.com/role/ValuationResultsAndNetTradingIncomeAdditionalInformationDetail
2360 Valuation Results And Net Trading Income [Table] Table

*

*

 ing:ValuationResultsAndNetTradingIncomeTable
2361 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
2362 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
2363 Trading securities [member] Member ifrs-full:TradingSecuritiesMember
2364 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
2365 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
2366 Voya Financial Inc and NN Group NV [member] Member ing:VoyaFinancialIncAndNnGroupNvMember
2367 Disclosure Of Valuation Results And Net Trading Income [Line Items] LineItems ing:DisclosureOfValuationResultsAndNetTradingIncomeLineItems
2368 Trading gains and losses relating to trading securities Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnFinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTrading
2369 CVA/DVA Adjustments on trading derivatives Concept (Monetary) For Period Debit ing:CreditValuationAdjustmentsDebtValuationAdjustmentsOnTradingDerivatives
2370 Fair value adjustments on own issued notes Concept (Monetary) For Period Debit ing:FairValueAdjustmentsOnOwnIssuedNotes
2371 DVA adjustment on own issued notes Concept (Monetary) For Period Debit ing:DebtValuationAdjustmentsOnOwnIssuedNotes
2372 Amount related to warrants on shares Concept (Monetary) As Of Debit ing:AmountOfWarrantsHeldForSharesIncludedInOtherNontradingDerivatives
2373 Interest income on financial assets held for trading Concept (Monetary) For Period Credit ifrs-full:InterestIncomeOnFinancialAssetsHeldForTrading
2374 Interest expense on financial liabilities held for trading Concept (Monetary) For Period Debit ifrs-full:InterestExpenseOnFinancialLiabilitiesHeldForTrading
2375 042201 - Disclosure - Investment Income - Summary of Investment Income (Detail) Network

*

*

 http://www.ing.com/role/InvestmentIncomeSummaryOfInvestmentIncomeDetail
2376 Disclosure of Detailed Information about Investment Income [table] Table

*

*

 ing:DisclosureOfDetailedInformationAboutInvestmentIncomeTable
2377 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
2378 Assets [member] Member ifrs-full:ClassesOfAssetsMember
2379 Debt securities [member] Member ifrs-full:DebtSecuritiesMember
2380 Available for sale debt securities [member] Member ing:AvailableForSaleAtDebtMember
2381 Equity securities [member] Member ifrs-full:TradingEquitySecuritiesMember
2382 Categories of financial assets [axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
2383 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
2384 Financial assets at fair value through other comprehensive income, category [member] Member ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember
2385 Disclosure of Investment Income [line items] LineItems ing:DisclosureOfInvestmentIncomeLineItems
2386 Dividend income Concept (Monetary) For Period Credit ifrs-full:RevenueFromDividends
2387 Gains (losses) on disposals of investments Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnDisposalsOfInvestments
2388 Impairments of available-for-sale debt securities Concept (Monetary) For Period Debit ing:ImpairmentsOfAvailableForSaleDebtSecurities
2389 Reversal of impairment loss recognised in profit or loss Concept (Monetary) For Period Credit ifrs-full:ReversalOfImpairmentLossRecognisedInProfitOrLoss
2390 Realised gains/losses and impairments of debt securities Concept (Monetary) For Period Credit ing:RealisedGainsLossesAndImpairmentsOfDebtSecurities
2391 Impairments of available-for-sale equity securities Concept (Monetary) For Period Debit ing:ImpairmentOfAvailableForSaleSecurities
2392 Realised gains/losses and impairments Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnAvailableforsaleFinancialAssets
2393 Income from and fair value gains/losses on investment properties Concept (Monetary) For Period ifrs-full:GainsLossesOnFairValueAdjustmentInvestmentProperty
2394 Investment income Concept (Monetary) For Period Credit ifrs-full:InvestmentIncome
2395 042203 - Disclosure - Investment Income - Summary of Impairments and Reversals of Impairment on Investments per Segment (Detail) Network

*

*

 http://www.ing.com/role/InvestmentIncomeSummaryOfImpairmentsAndReversalsOfImpairmentOnInvestmentsPerSegmentDetail
2396 Disclosure Of Impairments And Reversals Of Impairment On Investments Per Segment [Table] Table

*

*

 ing:DisclosureOfImpairmentsAndReversalsOfImpairmentOnInvestmentsPerSegmentTable
2397 Segments [axis] Axis ifrs-full:SegmentsAxis
2398 Segments [member] Member ifrs-full:SegmentsMember
2399 Retail Belgium [member] Member ing:RetailBelgiumMember
2400 Wholesale Banking [member] Member ing:WholesaleBankingMember
2401 Corporate Line Banking [member] Member ing:CorporateLineBankingMember
2402 Disclosure Of Impairments And Reversals Of Impairment On Investments Per Segment [Line Items] LineItems ing:DisclosureOfImpairmentsAndReversalsOfImpairmentOnInvestmentsPerSegmentLineItems
2403 Impairments Concept (Monetary) For Period Debit ifrs-full:ImpairmentLossRecognisedInProfitOrLoss
2404 Reversal of impairments Concept (Monetary) For Period Credit ifrs-full:ReversalOfImpairmentLossRecognisedInProfitOrLoss
2405 042204 - Disclosure - Investment Income - Additional Information (Detail) Network

*

*

 http://www.ing.com/role/InvestmentIncomeAdditionalInformationDetail
2406 Disclosure of Detailed Information about Investment Income [table] Table

*

*

 ing:DisclosureOfDetailedInformationAboutInvestmentIncomeTable
2407 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
2408 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
2409 Business combinations [member] Member ifrs-full:BusinessCombinationsMember
2410 Legal Entity [Axis] Axis dei:LegalEntityAxis
2411 Entity [Domain] Member dei:EntityDomain
2412 Visa europe limited [member] Member ing:VISAEuropeLimitedMember
2413 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
2414 Assets [member] Member ifrs-full:ClassesOfAssetsMember
2415 Equity securities [member] Member ifrs-full:TradingEquitySecuritiesMember
2416 Disclosure of Investment Income [line items] LineItems ing:DisclosureOfInvestmentIncomeLineItems
2417 Dividend income Concept (Monetary) For Period Credit ifrs-full:RevenueFromDividends
2418 Realised gains/losses on disposal of equity securities Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnDisposalsOfInvestments
2419 042301 - Disclosure - Result on Disposal of Group Companies - Summary of Result on Disposal of Group Companies (Detail) Network

*

*

 http://www.ing.com/role/ResultOnDisposalOfGroupCompaniesSummaryOfResultOnDisposalOfGroupCompaniesDetail
2420 Disclosure Of Gains Losses On Disposals Of Noncurrent Assets [Table] Table

*

*

 ing:DisclosureOfGainsLossesOnDisposalsOfNoncurrentAssetsTable
2421 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
2422 Property and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
2423 Baring Private Equity Partners [member] Member ing:BaringPrivateEquityPartnersMember
2424 ING Lease UK [member] Member ing:IngLeaseUkMember
2425 ING Lease Italy [Member] Member ing:IngLeaseItalyMember
2426 Disclosure Of Gains Losses On Disposals Of Noncurrent Assets [Line Items] LineItems ing:DisclosureOfGainsLossesOnDisposalsOfNoncurrentAssetsLineItems
2427 Gain loss on disposal of companies Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnDisposalsOfNoncurrentAssets
2428 042401 - Disclosure - Other Income - Additional Information (Detail) Network

*

*

 http://www.ing.com/role/OtherIncomeAdditionalInformationDetail
2429 Disclosure of analysis of other comprehensive income by item [table] Table

*

*

 ifrs-full:DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemTable
2430 Legal Entity [Axis] Axis dei:LegalEntityAxis
2431 Entity [Domain] Member dei:EntityDomain
2432 ING Australia Holdings Ltd [member] Member ing:INGAustraliaHoldingsLtdMember
2433 Disclosure of analysis of other comprehensive income by item [line items] LineItems ifrs-full:DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemLineItems
2434 Other income Concept (Monetary) For Period Credit ifrs-full:OtherIncome
2435 Operating lease income Concept (Monetary) For Period Credit ifrs-full:OperatingLeaseIncome
2436 Operating lease, depreciation Concept (Monetary) For Period ifrs-full:DepreciationRightofuseAssets
2437 042501 - Disclosure - Staff Expenses - Summary of Staff Expenses (Detail) Network

*

*

 http://www.ing.com/role/StaffExpensesSummaryOfStaffExpensesDetail
2438 Implied Table Table

*

*

 implied:Table
2439 Staff Expenses [Abstract] Abstract ing:StaffExpensesAbstract
2440 Salaries Concept (Monetary) For Period Debit ifrs-full:WagesAndSalaries
2441 Pension costs and other staff-related benefit costs Concept (Monetary) For Period Debit ing:PensionCostsAndOtherStaffRelatedBenefitCosts
2442 Social security costs Concept (Monetary) For Period Debit ifrs-full:SocialSecurityContributions
2443 Share-based compensation arrangements Concept (Monetary) For Period Debit ifrs-full:ExpenseFromSharebasedPaymentTransactionsWithEmployees
2444 External employees Concept (Monetary) For Period Debit ing:ExternalEmployeeExpense
2445 Education Concept (Monetary) For Period Debit ing:EducationExpense
2446 Other staff costs Concept (Monetary) For Period Debit ifrs-full:OtherEmployeeExpense
2447 Total staff expenses Concept (Monetary) For Period Debit ifrs-full:EmployeeBenefitsExpense
2448 042502 - Disclosure - Staff Expenses - Summary of Number of Employees (Detail) Network

*

*

 http://www.ing.com/role/StaffExpensesSummaryOfNumberOfEmployeesDetail
2449 Disclosure of terms and conditions of share-based payment arrangement [table] Table

*

*

 ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
2450 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
2451 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
2452 Netherlands [member] Member country:NL
2453 International [member] Member ifrs-full:ForeignCountriesMember
2454 Continuing and discontinued operations [axis] Axis ifrs-full:ContinuingAndDiscontinuedOperationsAxis
2455 Aggregate continuing and discontinued operations [member] Member ifrs-full:AggregateContinuingAndDiscontinuedOperationsMember
2456 Continuing operations [member] Member ifrs-full:ContinuingOperationsMember
2457 Discontinued operations [member] Member ifrs-full:DiscontinuedOperationsMember
2458 Disclosure of terms and conditions of share-based payment arrangement [line items] LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
2459 Total average number of employees at full time equivalent basis Concept (Decimal) For Period ifrs-full:AverageNumberOfEmployees
2460 042503 - Disclosure - Staff Expenses - Summary of Changes in Option Rights Outstanding (Detail) Network

*

*

 http://www.ing.com/role/StaffExpensesSummaryOfChangesInOptionRightsOutstandingDetail
2461 Implied Table Table

*

*

 implied:Table
2462 Staff Expenses [Abstract] Abstract ing:StaffExpensesAbstract
2463 Changes in option rights outstanding [abstract] Abstract ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementAbstract
2464 Options outstanding, Opening balance Concept (Decimal) As Of ifrs-full:NumberOfOutstandingShareOptions
2465 Options outstanding, Exercised Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsExercisedInSharebasedPaymentArrangement
2466 Options outstanding, Forfeited Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsForfeitedInSharebasedPaymentArrangement
2467 Options outstanding, Expired Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsExpiredInSharebasedPaymentArrangement
2468 Options outstanding, Closing balance Concept (Decimal) As Of ifrs-full:NumberOfOutstandingShareOptions
2469 Weighted average exercise price, Opening balance Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement
2470 Weighted average exercise price, Exercised Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement
2471 Weighted average exercise price, Forfeited Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsForfeitedInSharebasedPaymentArrangement
2472 Weighted average exercise price, Expired Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsExpiredInSharebasedPaymentArrangement
2473 Weighted average exercise price, Closing balance Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement
2474 042504 - Disclosure - Staff Expenses - Summary of Stock Options Outstanding and Exercisable (Detail) Network

*

*

 http://www.ing.com/role/StaffExpensesSummaryOfStockOptionsOutstandingAndExercisableDetail
2475 Stock Options Outstanding and Exercisable [Table] Table

*

*

 ing:StockOptionsOutstandingAndExercisableTable
2476 Ranges of exercise prices for outstanding share options [axis] Axis ifrs-full:RangesOfExercisePricesForOutstandingShareOptionsAxis
2477 Ranges of exercise prices for outstanding share options [member] Member ifrs-full:RangesOfExercisePricesForOutstandingShareOptionsMember
2478 Range of exercise price 0.00 - 5.00 [member] Member ing:RangesOfExercisePricesForStockOptionsOutstandingAndExercisableMember
2479 Range of exercise price 5.00 - 10.00 [member] Member ing:RangesOfExercisePricesForStockOptionsOutstandingAndExercisable2Member
2480 Range of exercise price 10.00 - 15.00 [member] Member ing:RangesOfExercisePricesForStockOptionsOutstandingAndExercisable3Member
2481 Range of exercise price 15.00 - 20.00 [member] Member ing:RangesOfExercisePricesForStockOptionsOutstandingAndExercisable4Member
2482 Range of exercise price 20.00 - 25.00 [member] Member ing:RangesOfExercisePricesForStockOptionsOutstandingAndExercisable5Member
2483 Range of exercise price 25.00 - 30.00 [member] Member ing:RangesOfExercisePricesForStockOptionsOutstandingAndExercisable6Member
2484 Range [axis] Axis ifrs-full:RangeAxis
2485 Ranges [member] Member ifrs-full:RangesMember
2486 Minimum [member] Member ifrs-full:BottomOfRangeMember
2487 Maximum [member] Member ifrs-full:TopOfRangeMember
2488 Stock Options Outstanding and Exercisable [Line Items] LineItems ing:StockOptionsOutstandingAndExercisableLineItems
2489 Range of exercise price in euros Concept (Monetary) As Of ing:ExercisePriceOfOutstandingShareOptionsOutstandingAndExercisable
2490 Weighted average remaining contractual life (years) Concept (Decimal) As Of ifrs-full:WeightedAverageRemainingContractualLifeOfOutstandingShareOptions
2491 Weighted average exercise price Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement
2492 Options outstanding and exercisable as at 31 December Concept (Decimal) For Period ing:NumberOfShareOptionsOutstandingAndExercisableSharebasedPaymentArrangement
2493 042505 - Disclosure - Staff Expenses - Summary of Changes in Share Awards (Detail) Network

*

*

 http://www.ing.com/role/StaffExpensesSummaryOfChangesInShareAwardsDetail
2494 Implied Table Table

*

*

 implied:Table
2495 Staff Expenses [Abstract] Abstract ing:StaffExpensesAbstract
2496 Options outstanding, Opening balance Concept (Decimal) As Of ing:NumberOfOutstandingShareAwards
2497 Options outstanding, Granted Concept (Decimal) For Period ing:NumberOfShareAwardsGrantedInSharebasedPaymentArrangement
2498 Options outstanding, Performance effect Concept (Decimal) For Period ing:NumberOfShareAwardsPerformanceEffectInSharebasedPaymentArrangement
2499 Options outstanding, Vested Concept (Decimal) For Period ing:NumberOfShareAwardsVestedInSharebasedPaymentArrangement
2500 Options outstanding, Forfeited Concept (Decimal) For Period ing:NumberOfShareAwardsForfeitedInSharebasedPaymentArrangement
2501 Options outstanding, Closing balance Concept (Decimal) As Of ing:NumberOfOutstandingShareAwards
2502 Opening balance Concept (Monetary) As Of Credit ing:WeightedAverageFairValueAtMeasurementDateShareOptions
2503 Granted Concept (Monetary) As Of Credit ifrs-full:WeightedAverageFairValueAtMeasurementDateShareOptionsGranted
2504 Performance effect Concept (Monetary) For Period Credit ing:WeightedAverageFairValueAtMeasurementDateShareOptionsPerformanceEffect
2505 Vested Concept (Monetary) For Period Credit ing:WeightedAverageFairValueAtMeasurementDateShareOptionsVested
2506 Forfeited Concept (Monetary) For Period Credit ing:WeightedAverageFairValueAtMeasurementDateShareOptionsForfeited
2507 Closing balance Concept (Monetary) As Of Credit ing:WeightedAverageFairValueAtMeasurementDateShareOptions
2508 042506 - Disclosure - Staff expenses - Additional Information (Detail) Network

*

*

 http://www.ing.com/role/StaffExpensesAdditionalInformationDetail
2509 Disclosure of terms and conditions of share-based payment arrangement [table] Table

*

*

 ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
2510 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
2511 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
2512 Executive board of ING Groep N.V. [member] Member ifrs-full:KeyManagementPersonnelOfEntityOrParentMember
2513 Management board of ING Bank [member] Member ing:ManagementBoardOfIngBankMember
2514 Senior management and other employees [member] Member ing:SeniorManagementAndOtherEmployeesMember
2515 Equity settled share based payment arrangements [member] Member ing:EquitySettledShareBasedPaymentArrangementsMember
2516 Cash settled share based payment arrangements [member] Member ing:CashSettledShareBasedPaymentArrangementsMember
2517 Disclosure of terms and conditions of share-based payment arrangement [line items] LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
2518 Expense related in equity settled share based payment arrangements Concept (Monetary) For Period Debit ing:ExpenseFromEquitySettledSharebasedPaymentArrangement
2519 Expense related in cash settled share based payment arrangements Concept (Monetary) For Period Debit ing:ExpenseFromCashSettledSharebasedPaymentArrangement
2520 Share awards granted Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsGrantedInSharebasedPaymentArrangement
2521 Description of share based payment arrangement Concept (Text/String) For Period ifrs-full:DescriptionOfMaximumTermOfOptionsGrantedForSharebasedPaymentArrangement
2522 Option rights valid period (years) Concept (Decimal) As Of ifrs-full:WeightedAverageRemainingContractualLifeOfOutstandingShareOptions
2523 Total options outstanding Concept (Decimal) As Of ifrs-full:NumberOfOutstandingShareOptions
2524 Weighted average share price, exercise for options exercised Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement
2525 Aggregate intrinsic value of options outstanding and exercisable Concept (Monetary) As Of Debit ing:AggregateIntrinsicValueOfOptionOutstandingAndExercisable
2526 Cash received from stock option exercise Concept (Monetary) For Period Debit ifrs-full:ProceedsFromExerciseOfOptions
2527 Share awards related in equity settled share based payment arrangements Concept (Decimal) As Of ing:ShareAwardsRelatingToEquitySettledSharebasedPaymentArrangement
2528 Share awards related in cash settled share based payment arrangements Concept (Decimal) As Of ing:ShareAwardsRelatingToCashSettledSharebasedPaymentArrangement
2529 Unrecognised compensation cost related to share awards amount Concept (Monetary) For Period Debit ing:UnrecognisedCompensationCostRelatedToShareAwards
2530 Costs expected to be recognised over weighted average period Concept (xbrli:durationItemType) For Period ing:WeightedAveragePeriodOfUnrecognisedCompensationCostsRelatedToShareAwards
2531 042601 - Disclosure - Other Operating Expenses - Summary of Other Operating Expenses (Detail) Network

*

*

 http://www.ing.com/role/OtherOperatingExpensesSummaryOfOtherOperatingExpensesDetail
2532 Implied Table Table

*

*

 implied:Table
2533 Disclosure of Other Operating Expense [Abstract] Abstract ing:DisclosureOfOtherOperatingExpenseAbstract
2534 Summary of Other Operating Expenses [abstract] Abstract ifrs-full:ExpenseByNatureAbstract
2535 IT related expenses Concept (Monetary) For Period Debit ing:InformationTechnologyExpenses
2536 Office expenses Concept (Monetary) For Period Debit ifrs-full:AdministrativeExpense
2537 Advertising and public relations Concept (Monetary) For Period Debit ifrs-full:AdvertisingExpense
2538 Travel and accommodation expenses Concept (Monetary) For Period Debit ifrs-full:TravelExpense
2539 External advisory fees Concept (Monetary) For Period Debit ifrs-full:ProfessionalFeesExpense
2540 Audit and non-audit services Concept (Monetary) For Period Debit ing:AuditAndNonAuditServices
2541 Postal charges Concept (Monetary) For Period Debit ing:PostalCharges
2542 Depreciation of property and equipment Concept (Monetary) For Period ifrs-full:DepreciationPropertyPlantAndEquipment
2543 Amortisation of intangible assets Concept (Monetary) For Period ifrs-full:AmortisationIntangibleAssetsOtherThanGoodwill
2544 Impairments and reversals on property and equipment and intangibles Concept (Monetary) For Period Credit ing:ImpairmentsAndReversalsOnPropertyAndEquipmentAndIntangibles
2545 Regulatory costs Concept (Monetary) For Period Debit ing:RegulatoryCosts
2546 Addition/(unused amounts reversed) of provision for reorganisations and relocations Concept (Monetary) For Period Debit ing:AdditionUnusedAmountsReversedProvisionForReorganisationsAndRelocations
2547 Addition/(unused amounts reversed) of other provisions Concept (Monetary) For Period Debit ing:AdditionUnusedAmountsReversedOfOtherProvisions
2548 Contributions and subscriptions Concept (Monetary) For Period Debit ing:ContributionsAndSubscriptions
2549 Other Concept (Monetary) For Period Debit ifrs-full:MiscellaneousOtherOperatingExpense
2550 Other operating expense Concept (Monetary) For Period Debit ifrs-full:OtherExpenseByNature
2551 042602 - Disclosure - Other Operating Expenses - Summary of Audit and Non-audit Services (Detail) Network

*

*

 http://www.ing.com/role/OtherOperatingExpensesSummaryOfAuditAndNonauditServicesDetail
2552 Implied Table Table

*

*

 implied:Table
2553 Disclosure of Other Operating Expense [Abstract] Abstract ing:DisclosureOfOtherOperatingExpenseAbstract
2554 Fees of Group's auditor Abstract ifrs-full:AuditorsRemunerationAbstract
2555 Audit fees Concept (Monetary) For Period Debit ifrs-full:AuditorsRemunerationForAuditServices
2556 Audit related fees Concept (Monetary) For Period Debit ifrs-full:AuditorsRemunerationForOtherServices
2557 Tax fees Concept (Monetary) For Period Debit ifrs-full:AuditorsRemunerationForTaxServices
2558 Total Concept (Monetary) For Period Debit ifrs-full:AuditorsRemuneration
2559 042603 - Disclosure - Other Operating Expenses - Summary of Intangible Amortisation and (Reversals of) Impairments (Detail) Network

*

*

 http://www.ing.com/role/OtherOperatingExpensesSummaryOfIntangibleAmortisationAndReversalsOfImpairmentsDetail
2560 Disclosure of impairment loss and reversal of impairment loss [table] Table

*

*

 ifrs-full:DisclosureOfImpairmentLossAndReversalOfImpairmentLossTable
2561 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
2562 Assets [member] Member ifrs-full:ClassesOfAssetsMember
2563 Property and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
2564 Classes of intangible assets other than goodwill [axis] Axis ifrs-full:ClassesOfIntangibleAssetsOtherThanGoodwillAxis
2565 Intangible assets other than goodwill [member] Member ifrs-full:IntangibleAssetsOtherThanGoodwillMember
2566 Property development [member] Member ing:PropertyDevelopmentMember
2567 Software and other intangible assets [member] Member ifrs-full:ComputerSoftwareMember
2568 (Reversals of) other impairments [member] Member ing:ReversalsOfOtherImpairmentsMember
2569 Disclosure of impairment loss and reversal of impairment loss [line items] LineItems ifrs-full:DisclosureOfImpairmentLossAndReversalOfImpairmentLossLineItems
2570 Impairment losses Concept (Monetary) For Period Debit ifrs-full:ImpairmentLoss
2571 Reversals of impairments Concept (Monetary) For Period Credit ifrs-full:ReversalOfImpairmentLoss
2572 Total Concept (Monetary) For Period Debit ing:IntangibleImpairmentAndReversalsOfImpairmentsLoss
2573 042604 - Disclosure - Other operating expenses - Additional Information (Detail) Network

*

*

 http://www.ing.com/role/OtherOperatingExpensesAdditionalInformationDetail
2574 Disclosure Of Other Operating Expense [Table] Table

*

*

 ing:DisclosureOfOtherOperatingExpenseTable
2575 Other Operating Income Expense [Axis] Axis ing:OtherOperatingIncomeExpenseAxis
2576 Other Operating Income Expense [Domain] Member ing:OtherOperatingIncomeExpenseDomain
2577 Regulatory Cost [Member] Member ing:RegulatoryCostMember
2578 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
2579 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
2580 Netherlands [member] Member country:NL
2581 Netherlands, Germany, Belgium, Poland, and Spain [Member] Member ing:NetherlandsGermanyBelgiumPolandAndSpainMember
2582 Types of interest rates [axis] Axis ifrs-full:TypesOfInterestRatesAxis
2583 Interest rate types [member] Member ifrs-full:InterestRateTypesMember
2584 Floating rate debt securities [member] Member ifrs-full:FloatingInterestRateMember
2585 Classes of other provisions [axis] Axis ifrs-full:ClassesOfProvisionsAxis
2586 Other provisions [member] Member ifrs-full:OtherProvisionsMember
2587 Criminal investigations, fine [Member] Member ing:CriminalInvestigationsFineMember
2588 Criminal investigations, disgorgement [Member] Member ing:CriminalInvestigationsDisgorgementMember
2589 Range [axis] Axis ifrs-full:RangeAxis
2590 Ranges [member] Member ifrs-full:RangesMember
2591 Top of range [member] Member ifrs-full:TopOfRangeMember
2592 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
2593 Disclosure of other operating expenses [line items] LineItems ing:DisclosureOfOtherOperatingExpensesLineItems
2594 Settlement with the Dutch Authorities Concept (Monetary) For Period Debit ifrs-full:LossesOnLitigationSettlements
2595 Legal Proceedings Provision Concept (Monetary) As Of Credit ifrs-full:LegalProceedingsProvision
2596 Lease and sublease payments in respect of operating leases Concept (Monetary) As Of Debit ifrs-full:ExpectedFutureMinimumSubleasePaymentsReceivableUnderNoncancellableSubleasesClassifiedAsOperatingLease
2597 Contributions to the Deposit Guarantee Schemes Concept (Monetary) For Period Debit ing:ContributionsToDepositGuaranteeSchemes
2598 Contributions to the Single Resolution Fund Concept (Monetary) For Period Debit ing:ContributionsToSingleResolutionFund
2599 Increase in local bank taxes Concept (Monetary) For Period Debit ing:IncreaseInLocalBankTaxes
2600 Local bank taxes Concept (Monetary) As Of Credit ing:LocalBankTaxes
2601 Other one-off procured cost savings Concept (Monetary) For Period Credit ing:OtherOneoffprocuredCostSavings
2602 Adjustment of bank fees related to prior periods Concept (Monetary) For Period Credit ing:AdjustmentOfBankFeesRelatedToPriorPeriods
2603 Decrease on local bank taxes Concept (Monetary) For Period Credit ing:DecreaseOnLocalBankTaxes
2604 042701 - Disclosure - Discontinued operations - Summary of Net Result From Discounted Operations (Detail) Network

*

*

 http://www.ing.com/role/DiscontinuedOperationsSummaryOfNetResultFromDiscountedOperationsDetail
2605 Disclosure of analysis of single amount of discontinued operations [table] Table

*

*

 ifrs-full:DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsTable
2606 Continuing and discontinued operations [axis] Axis ifrs-full:ContinuingAndDiscontinuedOperationsAxis
2607 Aggregate continuing and discontinued operations [member] Member ifrs-full:AggregateContinuingAndDiscontinuedOperationsMember
2608 Discontinued operations [member] Member ifrs-full:DiscontinuedOperationsMember
2609 NN Group [member] Member ing:NNGroupMember
2610 Voya Financial Inc., divestment [member] Member ing:VoyaFinancialIncMember
2611 Disclosure of analysis of single amount of discontinued operations [line items] LineItems ifrs-full:DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsLineItems
2612 Net result from discontinued operations Concept (Monetary) For Period Credit ing:ProfitLossFromDiscontinuedOperationsNet
2613 Net result from classification as discontinued operations Concept (Monetary) For Period Credit ing:ProfitLossFromClassificationAsDiscontinuedOperations
2614 Net result from disposal of discontinued operations Concept (Monetary) For Period Credit ing:ProfitLossFromDisposalOfDiscontinuedOperations
2615 Total net result from discontinued operations (before non-controlling interests) Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromDiscontinuedOperations
2616 042702 - Disclosure - Discontinued Operation - Additional Information (Detail) Network

*

*

 http://www.ing.com/role/DiscontinuedOperationAdditionalInformationDetail
2617 Disclosure of analysis of single amount of discontinued operations [table] Table

*

*

 ifrs-full:DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsTable
2618 Continuing and discontinued operations [axis] Axis ifrs-full:ContinuingAndDiscontinuedOperationsAxis
2619 Aggregate continuing and discontinued operations [member] Member ifrs-full:AggregateContinuingAndDiscontinuedOperationsMember
2620 Discontinued operations [member] Member ifrs-full:DiscontinuedOperationsMember
2621 Divestment of remaining share holding In NN Group [member] Member ing:DivestmentOfRemainingShareHoldingInNnGroupMember
2622 NN Group [member] Member ing:NNGroupMember
2623 Voya Financial Inc., divestment [member] Member ing:VoyaFinancialIncMember
2624 Disclosure of analysis of single amount of discontinued operations [line items] LineItems ifrs-full:DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsLineItems
2625 Tax effect on the result on disposal of discontinued operations Concept (Monetary) For Period Debit ifrs-full:TaxExpenseRelatingToGainLossOnDiscontinuance
2626 Dividend received Concept (Monetary) For Period Debit ifrs-full:DividendsReceived
2627 Total comprehensive income net of tax Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
2628 Total comprehensive income attributable to equity holders Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncomeAttributableToOwnersOfParent
2629 Total comprehensive income attributable to non-controlling interests Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncomeAttributableToNoncontrollingInterests
2630 Interest held Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInAssociate
2631 Profit (loss) from discontinued operations Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromDiscontinuedOperations
2632 Disposal of ordinary shares in divestment transaction Concept (Shares) For Period ing:NumberOfShareDisposed
2633 Ordinary shares repurchased Concept (Shares) For Period ing:NumberOfOrdinarySharesRepurchased
2634 Gross transaction value in divestment transaction Concept (Monetary) For Period Debit ifrs-full:ProceedsFromSalesOfInterestsInAssociates
2635 Mandatory exchangeable subordinated notes exchanged Concept (Monetary) As Of Credit ing:DebtSecuritiesExchangedPrincipalAmount
2636 Notes exchanged into ordinary shares Concept (Monetary) As Of Credit ifrs-full:SubordinatedLiabilities
2637 Ordinary shares issued in exchange of notes Concept (Shares) For Period ing:SharesReceivedFromExchange
2638 Notes settled in cash Concept (Monetary) For Period Credit ifrs-full:RepaymentsOfBorrowingsClassifiedAsFinancingActivities
2639 Gains losses recognised on desconsolidaiton Concept (Monetary) For Period Credit ifrs-full:GainsLossesRecognisedWhenControlInSubsidiaryIsLost
2640 042801 - Disclosure - Earnings Per Ordinary Share - Summary of Earnings Per Ordinary Share (Detail) Network

*

*

 http://www.ing.com/role/EarningsPerOrdinaryShareSummaryOfEarningsPerOrdinaryShareDetail
2641 Implied Table Table

*

*

 implied:Table
2642 Basic earnings per share [abstract] Abstract ifrs-full:BasicEarningsPerShareAbstract
2643 Amount Abstract ifrs-full:ProfitLossAttributableToOrdinaryEquityHoldersOfParentEntityAbstract
2644 Basic earnings Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOwnersOfParent
2645 Basic earnings from discontinued operations, amount Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromDiscontinuedOperationsAttributableToOrdinaryEquityHoldersOfParentEntity
2646 Basic earnings from continuing operations, amount Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromContinuingOperationsAttributableToOrdinaryEquityHoldersOfParentEntity
2647 Diluted earnings, amount Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOrdinaryEquityHoldersOfParentEntityIncludingDilutiveEffects
2648 Diluted earnings from discontinued operations, amount Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromDiscontinuedOperationsAttributableToOrdinaryEquityHoldersOfParentEntityIncludingDilutiveEffects
2649 Diluted earnings from continuing operations, amount Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromContinuingOperationsAttributableToOrdinaryEquityHoldersOfParentEntityIncludingDilutiveEffects
2650 Weighted average number of ordinary shares outstanding during the period Abstract ifrs-full:WeightedAverageSharesAndAdjustedWeightedAverageSharesAbstract
2651 Basic earnings Concept (Shares) For Period ifrs-full:WeightedAverageShares
2652 Stock option and share plans Concept (Shares) For Period ifrs-full:DilutiveEffectOfShareOptionsOnNumberOfOrdinaryShares
2653 Total effect of dilutive instruments Concept (Shares) For Period ing:DilutedNumberOfShares
2654 Diluted earnings Concept (Shares) For Period ifrs-full:AdjustedWeightedAverageShares
2655 Per ordinary share Abstract ifrs-full:EarningsPerShareAbstract
2656 Basic earnings Concept (Share) For Period ifrs-full:BasicEarningsLossPerShare
2657 Basic earnings from discontinued operations Concept (Share) For Period ifrs-full:BasicEarningsLossPerShareFromDiscontinuedOperations
2658 Basic earnings from continuing operations Concept (Share) For Period ifrs-full:BasicEarningsLossPerShareFromContinuingOperations
2659 Diluted earnings Concept (Share) For Period ifrs-full:DilutedEarningsLossPerShare
2660 Diluted earnings from discontinued operations Concept (Share) For Period ifrs-full:DilutedEarningsLossPerShareFromDiscontinuedOperations
2661 Diluted earnings from continuing operations Concept (Share) For Period ifrs-full:DilutedEarningsLossPerShareFromContinuingOperations
2662 042901 - Disclosure - Dividend Per Ordinary Share - Schedule of Dividends to Shareholders of the Parent (Detail) Network

*

*

 http://www.ing.com/role/DividendPerOrdinaryShareScheduleOfDividendsToShareholdersOfTheParentDetail
2663 Implied Table Table

*

*

 implied:Table
2664 Disclosure of Dividends [abstract] Abstract ing:DisclosureOfDividendsAbstract
2665 Dividend per ordinary share paid Concept (Share) For Period ifrs-full:DividendsPaidOrdinarySharesPerShare
2666 Dividends paid Concept (Monetary) For Period Debit ifrs-full:DividendsPaidOrdinaryShares
2667 Dividends per ordinary share Concept (Share) For Period ifrs-full:DividendsRecognisedAsDistributionsToOwnersPerShare
2668 Dividends Concept (Monetary) For Period Debit ifrs-full:DividendsRecognisedAsDistributionsToOwnersOfParent
2669 042902 - Disclosure - Dividend Per Ordinary Share - Additional Information (Detail) Network

*

*

 http://www.ing.com/role/DividendPerOrdinaryShareAdditionalInformationDetail
2670 Implied Table Table

*

*

 implied:Table
2671 Disclosure of Dividends [abstract] Abstract ing:DisclosureOfDividendsAbstract
2672 Withholding tax on dividends paid, ordinary shares Concept (Percent) For Period ing:WithholdingTaxOnDividendsPaid
2673 043001 - Disclosure - Net cash flow from operating activities (Details) Network

*

*

 http://www.ing.com/role/NetCashFlowFromOperatingActivitiesDetails
2674 Implied Table Table

*

*

 implied:Table
2675 Disclosure Of Net Cash Flow From Operating Activities [abstract] Abstract ing:DisclosureOfNetCashFlowFromOperatingActivitiesAbstract
2676 Cash flows from operating activities 32 Abstract ifrs-full:CashFlowsFromUsedInOperatingActivitiesAbstract
2677 Results before tax Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
2678 Adjusted for: - depreciation and amortisation Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDepreciationAndAmortisationExpense
2679 - Addition to loan loss provisions Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForProvisions
2680 - Other Concept (Monetary) For Period Debit ifrs-full:OtherAdjustmentsToReconcileProfitLoss
2681 Taxation paid Concept (Monetary) For Period Credit ifrs-full:IncomeTaxesPaidClassifiedAsOperatingActivities
2682 - Loans and advances to banks, not available on demand Concept (Monetary) For Period Debit ing:AdjustmentsForIncreaseDecreaseInLoansAndAdvancesToBanksNotAvailableOnDemand
2683 - Deposits from banks, not payable on demand Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncreaseDecreaseInDepositsFromBanks
2684 Net change in Loans and advances to/from banks, not available/payable on demand Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInLoansAndAdvancesToBanks
2685 - Trading assets Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInFinancialAssetsHeldForTrading
2686 - Trading liabilities Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables
2687 Net change in Trading assets and Trading liabilities Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables
2688 - Loans and advances to customers Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInLoansAndAdvancesToCustomers
2689 - Customer deposits Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncreaseDecreaseInDepositsFromCustomers
2690 - Non-trading derivatives Concept (Monetary) For Period Debit ing:AdjustmentsForIncreaseDecreaseInNonTradingDerivatives
2691 - Assets designated at fair value through profit or loss Concept (Monetary) For Period Debit ing:AdjustmentsForIncreaseDecreaseInOtherFinancialAssetsAtFairValueThroughProfitOrLoss
2692 - Assets mandatorily at fair value through profit or loss Concept (Monetary) For Period Debit ing:AdjustmentsForIncreaseDecreaseInFinancialAssetsMandatorilyAtFairValueThroughProfitOrLoss
2693 - Other assets Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInOtherAssets
2694 - Other financial liabilities at fair value through profit or loss Concept (Monetary) For Period Debit ing:AdjustmentsForIncreaseDecreaseInOtherFinancialLiabilitiesAtFairValueThroughProfitOrLoss
2695 - Provisions and other liabilities Concept (Monetary) For Period Debit ing:AdjustmentsForProvisionsAndOtherLiabilities
2696 - Other Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncreaseDecreaseInOtherLiabilities
2697 Net cash flow from/(used in) operating activities Concept (Monetary) For Period ifrs-full:CashFlowsFromUsedInOperatingActivities
2698 043101 - Disclosure - Changes in liabilities arising from financing activities - Summary of Changes in liabilties arising from financing activities (Detail) Network

*

*

 http://www.ing.com/role/ChangesInLiabilitiesArisingFromFinancingActivitiesSummaryOfChangesInLiabiltiesArisingFromFinancingActivitiesDetail
2699 Changes in liabilities arising from financing activities [table] Table

*

*

 ing:ChangesInLiabilitiesArisingFromFinancingActivitiesTable
2700 Liabilities arising from financing activities [axis] Axis ifrs-full:LiabilitiesArisingFromFinancingActivitiesAxis
2701 Liabilities arising from financing activities [member] Member ifrs-full:LiabilitiesArisingFromFinancingActivitiesMember
2702 Debt securities in issue [member] Member ing:DebtSecuritiesInIssueMember
2703 Subordinated loans [member] Member ing:SubordinatedLoansMember
2704 Changes in liabilities arising from financing activities [line items] LineItems ing:ChangesInLiabilitiesArisingFromFinancingActivitiesLineItems
2705 Opening balance Concept (Monetary) As Of Credit ifrs-full:LiabilitiesArisingFromFinancingActivities
2706 Effect of change in accounting policy Concept (Monetary) For Period Credit ing:EffectOfChangeInAccountingPolicyLiabilitiesIfrs9
2707 Additions Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughFinancingCashFlowsLiabilitiesArisingFromFinancingActivities
2708 Redemptions /Disposals Concept (Monetary) For Period Credit ing:IncreaseDecreaseThroughRedemptionsOrDisposalsLiabilitiesArisingFromFinancingActivities
2709 Acqusition Concept (Monetary) For Period Credit ing:IncreaseDecreaseThroughAcqusitionLiabilitiesArisingFromFinancingActivities
2710 Non cash changes (Amortisation) Concept (Monetary) For Period Credit ing:IncreaseDecreaseThroughAmortisationLiabilitiesArisingFromFinancingActivities
2711 Other changes Concept (Monetary) For Period Credit ing:IncreaseDecreaseThroughTransferAssetOrLiabilitiesArisingFromFinancingActivities
2712 Changes in FV Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughChangesInFairValuesLiabilitiesArisingFromFinancingActivities
2713 Foreign exchange movement Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughEffectOfChangesInForeignExchangeRatesLiabilitiesArisingFromFinancingActivities
2714 Closing balance Concept (Monetary) As Of Credit ifrs-full:LiabilitiesArisingFromFinancingActivities
2715 043201 - Disclosure - Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) Network

*

*

 http://www.ing.com/role/CashAndCashEquivalentsSummaryOfCashAndCashEquivalentsDetail
2716 Implied Table Table

*

*

 implied:Table
2717 Cash and cash equivalent [abstract] Abstract ifrs-full:CashAndCashEquivalentsAbstract
2718 Treasury bills and other eligible bills Concept (Monetary) As Of Debit ing:TreasuryBillsAndOtherEligibleBills
2719 Deposits from banks/Loans and advances to banks Concept (Monetary) As Of Credit ing:CashAndCashEquivalentsDepositsFromBanksOrLoansAndAdvancesToBanks
2720 Cash and balances with central banks Concept (Monetary) As Of Debit ifrs-full:CashAndBankBalancesAtCentralBanks
2721 Cash and cash equivalents classified as Assets held for sale Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalentsClassifiedAsPartOfDisposalGroupHeldForSale
2722 Cash and cash equivalents at end of year Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
2723 Treasury bills and other eligible bills included in cash and cash equivalents Abstract ifrs-full:DebtInstrumentsHeldAbstract
2724 Treasury bills and other eligible bills included in trading assets Concept (Monetary) As Of Debit ing:CashAndCashEquivalentsTreasuryBillsAndOtherEligibleBillsIncludedInTradingAssets
2725 Treasury bills and other eligible bills included in AFS investments Concept (Monetary) As Of Debit ing:CashAndCashEquivalentsTreasuryBillsAndOtherEligibleBillsIncludedInAvailableForSaleInvestments
2726 Treasury bills and other eligible bills included in FVOCI Concept (Monetary) As Of Debit ing:CashAndCashEquivalentsTreasuryBillsAndOtherEligibleBillsIncludedInFvoci
2727 Treasury bills and other eligible bills included in securities at AC Concept (Monetary) As Of Debit ing:CashAndCashEquivalentsTreasuryBillsAndOtherEligibleBillsIncludedInSecuritiesAtAccumulatedCost
2728 Total treasury bills and other eligible bills included in cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:DebtInstrumentsHeld
2729 Deposits from banks/Loans and advances to banks included in cash and cash equivalents: Abstract ing:DepositsFromBanksLoansAndAdvancesToBanksIncludedInCashAndCashEquivalentsAbstract
2730 Deposits from banks Concept (Monetary) As Of Credit ing:IncludedInCashAndCashEquivalentsOfDepositsFromBanks
2731 Loans and advances to banks Concept (Monetary) As Of Debit ing:IncludedInCashAndCashEquivalentsOfLoansAndAdvancesToBanks
2732 Total deposits from banks/Loans and advances to banks included in cash and cash equivalents Concept (Monetary) As Of Credit ing:CashAndCashEquivalentsDepositsFromBanksOrLoansAndAdvancesToBanks
2733 Deposits from banks/Loans and advances to banks not included in cash and cash equivalents: Abstract ing:DepositsFromBanksLoansAndAdvancesToBanksNotIncludedInCashAndCashEquivalentsAbstract
2734 Deposits from banks Concept (Monetary) As Of Credit ing:NotIncludedInCashAndCashEquivalentsOfDepositsFromBanks
2735 Loans and advances to banks Concept (Monetary) As Of Debit ing:NotIncludedInCashAndCashEquivalentsOfLoansAndAdvancesToBanks
2736 Total deposits from banks/Loans and advances to banks not not included in cash and cash equivalents Concept (Monetary) As Of Credit ing:NotCashAndCashEquivalentsDepositsFromBanksOrLoansAndAdvancesToBanks
2737 Deposits from banks/Loans and advances to banks included in the statement of financial position: Abstract ing:DepositsFromBanksLoansAndAdvancesToBanksIncludedInTheStatementOfFinancialPositionAbstract
2738 Deposits from banks Concept (Monetary) As Of Credit ifrs-full:DepositsFromBanks
2739 Loans and advances to banks Concept (Monetary) As Of Debit ifrs-full:LoansAndAdvancesToBanks
2740 Total deposits from banks/Loans and advances to banks included in the statement of financial position Concept (Monetary) As Of Credit ing:DepositsFromBanksOrLoansAndAdvancesToBanks
2741 043301 - Disclosure - Segments - Summary of Reconciliation Between Underlying and IFRS Income, Expenses and Net Result (Detail) Network

*

*

 http://www.ing.com/role/SegmentsSummaryOfReconciliationBetweenUnderlyingAndIFRSIncomeExpensesAndNetResultDetail
2742 Disclosure of operating segments [table] Table

*

*

 ifrs-full:DisclosureOfOperatingSegmentsTable
2743 Continuing and discontinued operations [axis] Axis ifrs-full:ContinuingAndDiscontinuedOperationsAxis
2744 Aggregate continuing and discontinued operations [member] Member ifrs-full:AggregateContinuingAndDiscontinuedOperationsMember
2745 Discontinued operations [member] Member ifrs-full:DiscontinuedOperationsMember
2746 Continuing operations [member] Member ifrs-full:ContinuingOperationsMember
2747 Departure from requirement of IFRS [axis] Axis ifrs-full:DepartureFromRequirementOfIFRSAxis
2748 Currently stated [member] Member ifrs-full:RestatedMember
2749 Increase (decrease) due to departure from requirement of IFRS [member] Member ifrs-full:IncreaseDecreaseDueToDepartureFromRequirementOfIFRSMember
2750 Divestments Excluded From IFRS [Member] Member ing:DivestmentsExcludedFromIfrsMember
2751 Special Items Excluded From IFRS [Member] Member ing:SpecialItemsExcludedFromIfrsMember
2752 Insurance Other Excluded From IFRS [Member] Member ing:InsuranceOtherExcludedFromIfrsMember
2753 Adjustment of the EU IAS 39 carve out [Member] Member ing:AdjustmentOfEuIas39CarveOutMember
2754 Underlying Results Excluding Adjustments From IFRS [Member] Member ing:UnderlyingResultsExcludingAdjustmentsFromIfrsMember
2755 Segment consolidation items [axis] Axis ifrs-full:SegmentConsolidationItemsAxis
2756 Entity's total for segment consolidation items [member] Member ifrs-full:EntitysTotalForSegmentConsolidationItemsMember
2757 Elimination of intersegment amounts [member] Member ifrs-full:EliminationOfIntersegmentAmountsMember
2758 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
2759 Equity [member] Member ifrs-full:EquityMember
2760 Attributable to equity holder of the parent [member] Member ifrs-full:EquityAttributableToOwnersOfParentMember
2761 Disclosure of operating segments [line items] LineItems ifrs-full:DisclosureOfOperatingSegmentsLineItems
2762 Income Concept (Monetary) For Period Credit ifrs-full:Revenue
2763 Expenses Concept (Monetary) For Period Debit ifrs-full:OperatingExpense
2764 Taxation Concept (Monetary) For Period Debit us-gaap:IncomeTaxExpenseBenefit
2765 Non-controlling interests Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToNoncontrollingInterests
2766 Net result Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOwnersOfParent
2767 043302 - Disclosure - Segments - Schedule of ING Group Total (Detail) Network

*

*

 http://www.ing.com/role/SegmentsScheduleOfINGGroupTotalDetail
2768 Disclosure of operating segments [table] Table

*

*

 ifrs-full:DisclosureOfOperatingSegmentsTable
2769 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
2770 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
2771 ING Group [member] Member ing:INGGroupMember
2772 Products and services [axis] Axis ifrs-full:ProductsAndServicesAxis
2773 Products and services [member] Member ifrs-full:ProductsAndServicesMember
2774 ING Bank N.V. [member] Member ing:INGBankNVMember
2775 Other banking [member] Member ing:OtherBankingMember
2776 Total Banking [member] Member us-gaap:BankingMember
2777 Legacy insurance [member] Member ing:LegacyInsuranceMember
2778 Departure from requirement of IFRS [axis] Axis ifrs-full:DepartureFromRequirementOfIFRSAxis
2779 Currently stated [member] Member ifrs-full:RestatedMember
2780 Underlying [member] Member ing:UnderlyingResultsExcludingAdjustmentsFromIfrsMember
2781 Divestments [member] Member ing:DivestmentsExcludedFromIfrsMember
2782 Special items [member] Member ing:SpecialItemsExcludedFromIfrsMember
2783 Insurance other [member] Member ing:InsuranceOtherExcludedFromIfrsMember
2784 Adjustment of the EU IAS 39 carve out [Member] Member ing:AdjustmentOfEuIas39CarveOutMember
2785 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
2786 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
2787 NN Group [member] Member ing:NNGroupMember
2788 Voya [Member] Member ing:VoyaMember
2789 Segment consolidation items [axis] Axis ifrs-full:SegmentConsolidationItemsAxis
2790 Entity's total for segment consolidation items [member] Member ifrs-full:EntitysTotalForSegmentConsolidationItemsMember
2791 Elimination of intersegment amounts [member] Member ifrs-full:EliminationOfIntersegmentAmountsMember
2792 Disclosure of operating segments [line items] LineItems ifrs-full:DisclosureOfOperatingSegmentsLineItems
2793 Underlying income Abstract ing:UnderlyingIncomeAbstract
2794 - Net interest income Concept (Monetary) For Period Credit ifrs-full:InterestRevenueExpense
2795 - Net fee and commission income Concept (Monetary) For Period Credit ifrs-full:FeeAndCommissionIncomeExpense
2796 - Total investment and other income Concept (Monetary) For Period Credit ing:InvestmentAndOtherIncome
2797 Total Income Concept (Monetary) For Period Credit ifrs-full:Revenue
2798 Underlying expenditure Abstract ing:UnderlyingExpenditureAbstract
2799 - Operating expenses Concept (Monetary) For Period Debit ifrs-full:OperatingExpense
2800 - Additions to loan loss provision Concept (Monetary) For Period ifrs-full:AdditionalAllowanceRecognisedInProfitOrLossAllowanceAccountForCreditLossesOfFinancialAssets
2801 Total expenses Concept (Monetary) For Period Debit ifrs-full:ExpenseByNature
2802 Result before tax Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
2803 Taxation Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
2804 Non-controlling interests Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToNoncontrollingInterests
2805 Net result Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOwnersOfParent
2806 Net result IFRS (continuing operations) Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromContinuingOperations
2807 Total net result from discontinued operations Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromDiscontinuedOperations
2808 043303 - Disclosure - Segments - Summary of Segments Banking by Line of Business (Detail) Network

*

*

 http://www.ing.com/role/SegmentsSummaryOfSegmentsBankingByLineOfBusinessDetail
2809 Disclosure of operating segments [table] Table

*

*

 ifrs-full:DisclosureOfOperatingSegmentsTable
2810 Segments [axis] Axis ifrs-full:SegmentsAxis
2811 Segments [member] Member ifrs-full:SegmentsMember
2812 Retail Netherlands [member] Member ing:RetailNetherlandsMember
2813 Retail Belgium [member] Member ing:RetailBelgiumMember
2814 Retail Germany [member] Member ing:RetailGermanyMember
2815 Retail Other [member] Member ing:RetailOtherMember
2816 Wholesale Banking [member] Member ing:WholesaleBankingMember
2817 Corporate Line Banking [member] Member ing:CorporateLineBankingMember
2818 Products and services [axis] Axis ifrs-full:ProductsAndServicesAxis
2819 Products and services [member] Member ifrs-full:ProductsAndServicesMember
2820 Segments Banking Activities [Member] Member ing:BankingActivitiesMember
2821 Departure From Requirement Of IFRS [Axis] Axis ifrs-full:DepartureFromRequirementOfIFRSAxis
2822 Restated [Member] Member ifrs-full:RestatedMember
2823 Underlying [member] Member ing:UnderlyingResultsExcludingAdjustmentsFromIfrsMember
2824 Special items [member] Member ing:SpecialItemsExcludedFromIfrsMember
2825 Divestments [member] Member ing:DivestmentsExcludedFromIfrsMember
2826 Adjustment of the EU IAS 39 carve out [Member] Member ing:AdjustmentOfEuIas39CarveOutMember
2827 Insurance Other Excluded From IFRS [Member] Member ing:InsuranceOtherExcludedFromIfrsMember
2828 Disclosure of operating segments [line items] LineItems ifrs-full:DisclosureOfOperatingSegmentsLineItems
2829 Underlying income Abstract ing:UnderlyingIncomeAbstract
2830 - Net interest income Concept (Monetary) For Period Credit ifrs-full:InterestRevenueExpense
2831 - Net fee and commission income Concept (Monetary) For Period Credit ifrs-full:FeeAndCommissionIncomeExpense
2832 - Total investment and other income Concept (Monetary) For Period Credit ing:InvestmentAndOtherIncome
2833 Income Concept (Monetary) For Period Credit ifrs-full:Revenue
2834 Underlying expenditure Abstract ing:UnderlyingExpenditureAbstract
2835 - Operating expenses Concept (Monetary) For Period Debit ifrs-full:OperatingExpense
2836 - Additions to loan loss provision Concept (Monetary) For Period ifrs-full:AdditionalAllowanceRecognisedInProfitOrLossAllowanceAccountForCreditLossesOfFinancialAssets
2837 Total underlying expenses Concept (Monetary) For Period Debit ifrs-full:ExpenseByNature
2838 Result before tax Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
2839 Taxation Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
2840 Non-controlling interests Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToNoncontrollingInterests
2841 Net result Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOwnersOfParent
2842 Net result IFRS (continuing operations) Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromContinuingOperations
2843 Profit (loss) from discontinued operations Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromDiscontinuedOperations
2844 043304 - Disclosure - Segments - Summary of Geographical Segments Banking (Detail) Network

*

*

 http://www.ing.com/role/SegmentsSummaryOfGeographicalSegmentsBankingDetail
2845 Disclosure of operating segments [table] Table

*

*

 ifrs-full:DisclosureOfOperatingSegmentsTable
2846 Segments [axis] Axis ifrs-full:SegmentsAxis
2847 Segments [member] Member ifrs-full:SegmentsMember
2848 Geographical Segments Banking [Member] Member ing:GeographicalSegmentsBankingMember
2849 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
2850 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
2851 Netherlands [member] Member country:NL
2852 Belgium [member] Member country:BE
2853 Germany [member] Member country:DE
2854 Other Challengers [member] Member ing:OtherChallengersMember
2855 Growth Markets [member] Member ing:GrowthMarketMember
2856 Wholesale Banking Rest Of World [member] Member ing:WholesaleBankingRestOfWorldMember
2857 Other [member] Member ing:OtherSegmentMember
2858 Departure from requirement of IFRS [axis] Axis ifrs-full:DepartureFromRequirementOfIFRSAxis
2859 Currently stated [member] Member ifrs-full:RestatedMember
2860 Underlying [member] Member ing:UnderlyingResultsExcludingAdjustmentsFromIfrsMember
2861 Special items [member] Member ing:SpecialItemsExcludedFromIfrsMember
2862 Divestments [member] Member ing:DivestmentsExcludedFromIfrsMember
2863 Insurance Other Excluded From IFRS [Member] Member ing:InsuranceOtherExcludedFromIfrsMember
2864 Adjustment of the EU IAS 39 carve out [Member] Member ing:AdjustmentOfEuIas39CarveOutMember
2865 Disclosure of operating segments [line items] LineItems ifrs-full:DisclosureOfOperatingSegmentsLineItems
2866 Underlying income Abstract ing:UnderlyingIncomeAbstract
2867 - Net interest income Concept (Monetary) For Period Credit ifrs-full:InterestRevenueExpense
2868 - Net fee and commission income Concept (Monetary) For Period Credit ifrs-full:FeeAndCommissionIncomeExpense
2869 - Total investment and other income Concept (Monetary) For Period Credit ing:InvestmentAndOtherIncome
2870 Total income Concept (Monetary) For Period Credit ifrs-full:Revenue
2871 Underlying expenditure Abstract ing:UnderlyingExpenditureAbstract
2872 - Operating expenses Concept (Monetary) For Period Debit ifrs-full:OperatingExpense
2873 - Additions to loan loss provision Concept (Monetary) For Period ifrs-full:AdditionalAllowanceRecognisedInProfitOrLossAllowanceAccountForCreditLossesOfFinancialAssets
2874 Total underlying expenses Concept (Monetary) For Period Debit ifrs-full:ExpenseByNature
2875 Result before tax Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
2876 Taxation Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
2877 Non-controlling interests Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToNoncontrollingInterests
2878 Net result Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOwnersOfParent
2879 Net result IFRS (continuing operations) Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromContinuingOperations
2880 043401 - Disclosure - Information on Geographical Areas - Summary of Additional Information by Country (Detail) Network

*

*

 http://www.ing.com/role/InformationOnGeographicalAreasSummaryOfAdditionalInformationByCountryDetail
2881 Disclosure of geographical areas [table] Table

*

*

 ifrs-full:DisclosureOfGeographicalAreasTable
2882 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
2883 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
2884 Belgium [member] Member ing:BelgiumAreaMember
2885 Rest of Europe [Member] Member ing:RestOfEuropeMember
2886 North America [Member] Member srt:NorthAmericaMember
2887 Latin America [Member] Member srt:LatinAmericaMember
2888 Asia [Member] Member srt:AsiaMember
2889 Other [member] Member ing:OtherCountriesMember
2890 Geographical [Axis] Axis srt:StatementGeographicalAxis
2891 Geographical [Domain] Member srt:SegmentGeographicalDomain
2892 Netherlands [member] Member ifrs-full:CountryOfDomicileMember
2893 Belgium [member] Member country:BE
2894 Luxembourg [member] Member country:LU
2895 Poland [member] Member country:PL
2896 Germany [member] Member country:DE
2897 Romania [member] Member country:RO
2898 Spain [member] Member country:ES
2899 Italy [member] Member country:IT
2900 United Kingdom [member] Member country:GB
2901 France [member] Member country:FR
2902 Russia [member] Member country:RU
2903 Czech Republic [member] Member country:CZ
2904 Hungary [member] Member country:HU
2905 Slovakia [member] Member country:SK
2906 Ukraine [member] Member country:UA
2907 Austria [member] Member ing:AustriaMember
2908 Bulgaria [member] Member country:BG
2909 Ireland [member] Member country:IE
2910 Portugal [member] Member country:PT
2911 Switzerland [member] Member country:CH
2912 Canada [Member] Member country:CA
2913 United States [member] Member country:US
2914 Brazil [member] Member country:BR
2915 Colombia [member] Member country:CO
2916 Mexico [member] Member country:MX
2917 China [member] Member country:CN
2918 Japan [member] Member country:JP
2919 Macau [Member] Member country:MO
2920 Singapore [member] Member country:SG
2921 Hong Kong [member] Member country:HK
2922 Philippines [member] Member country:PH
2923 South Korea [member] Member country:KR
2924 Taiwan [member] Member country:TW
2925 Indonesia [member] Member country:ID
2926 Malaysia [member] Member country:MY
2927 India [member] Member country:IN
2928 Turkey [member] Member country:TR
2929 United Arab Emirates [member] Member country:AE
2930 Australia [member] Member country:AU
2931 Mauritius [member] Member country:MU
2932 Disclosure of geographical areas [line items] LineItems ifrs-full:DisclosureOfGeographicalAreasLineItems
2933 Name of principal subsidiary Concept (Text/String) For Period ifrs-full:NameOfSubsidiary
2934 Main activity Concept (Text/String) For Period ing:MajorBusinessActivity
2935 Average number of employees at full time equivalent basis Concept (Decimal) For Period ing:AverageNumberOfEmployeesOnFullTimeEquivalentBasis
2936 Total Income Concept (Monetary) For Period Credit ifrs-full:Revenue
2937 Total assets Concept (Monetary) As Of Debit ifrs-full:Assets
2938 Result before tax Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
2939 Taxation Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
2940 043402 - Disclosure - Information on Geographical Areas - Summary of Additional Information by Country (Parenthetical) (Detail) Network

*

*

 http://www.ing.com/role/InformationOnGeographicalAreasSummaryOfAdditionalInformationByCountryParentheticalDetail
2941 Disclosure of geographical areas [table] Table

*

*

 ifrs-full:DisclosureOfGeographicalAreasTable
2942 Geographical [Axis] Axis srt:StatementGeographicalAxis
2943 Geographical [Domain] Member srt:SegmentGeographicalDomain
2944 France [member] Member country:FR
2945 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
2946 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
2947 NN Group [member] Member ing:NNGroupMember
2948 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
2949 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
2950 Netherlands [member] Member ifrs-full:CountryOfDomicileMember
2951 Disclosure of geographical areas [line items] LineItems ifrs-full:DisclosureOfGeographicalAreasLineItems
2952 Public subsidies amount received Concept (Monetary) For Period Debit ing:PublicSubsidiesAmountReceived
2953 043403 - Disclosure - Information on Geographical Areas - Additional Information (Detail) Network

*

*

 http://www.ing.com/role/InformationOnGeographicalAreasAdditionalInformationDetail
2954 Implied Table Table

*

*

 implied:Table
2955 Disclosure of operating segments [abstract] Abstract ifrs-full:DisclosureOfOperatingSegmentsAbstract
2956 Number of operating segment Concept (Integer) For Period ing:NumberOfOperatingSegments1
2957 043501 - Disclosure - Pension and other post-employment benefits - Plan assets and defined benefit obligation per country (Detail) Network

*

*

 http://www.ing.com/role/PensionAndOtherPostemploymentBenefitsPlanAssetsAndDefinedBenefitObligationPerCountryDetail
2958 Disclosure of net defined benefit liability (asset) [table] Table

*

*

 ifrs-full:DisclosureOfNetDefinedBenefitLiabilityAssetTable
2959 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
2960 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
2961 Netherlands [member] Member country:NL
2962 United States [member] Member country:US
2963 United Kingdom [member] Member country:GB
2964 Belgium [member] Member country:BE
2965 Other Countries [member] Member ing:OtherCountriesMember
2966 Net defined benefit liability (asset) [axis] Axis ifrs-full:NetDefinedBenefitLiabilityAssetAxis
2967 Net defined benefit liability (asset) [member] Member ifrs-full:NetDefinedBenefitLiabilityAssetMember
2968 Plan assets [member] Member ifrs-full:PlanAssetsMember
2969 Defined benefit obligation [member] Member ifrs-full:PresentValueOfDefinedBenefitObligationMember
2970 Disclosure of net defined benefit liability (asset) [line items] LineItems ifrs-full:DisclosureOfNetDefinedBenefitLiabilityAssetLineItems
2971 Other assets Concept (Monetary) As Of Debit ifrs-full:RecognisedAssetsDefinedBenefitPlan
2972 Other liabilities Concept (Monetary) As Of Credit ifrs-full:RecognisedLiabilitiesDefinedBenefitPlan
2973 Funded status (Net defined benefit asset/(liability)) Concept (Monetary) As Of Debit ifrs-full:SurplusDeficitInPlan
2974 Funded status (Net defined benefit asset/(liability)) Concept (Monetary) As Of Credit ifrs-full:LiabilityAssetOfDefinedBenefitPlans
2975 043502 - Disclosure - Pension and Other Post-Employment Benefits - Changes in Fair Value of Plan Assets (Detail) Network

*

*

 http://www.ing.com/role/PensionAndOtherPostEmploymentBenefitsChangesInFairValueOfPlanAssetsDetail
2976 Disclosure of fair value of plan assets [table] Table

*

*

 ifrs-full:DisclosureOfFairValueOfPlanAssetsTable
2977 Net defined benefit liability (asset) [axis] Axis ifrs-full:NetDefinedBenefitLiabilityAssetAxis
2978 Net defined benefit liability (asset) [member] Member ifrs-full:NetDefinedBenefitLiabilityAssetMember
2979 Plan assets [member] Member ifrs-full:PlanAssetsMember
2980 Disclosure of fair value of plan assets [line items] LineItems ifrs-full:DisclosureOfFairValueOfPlanAssetsLineItems
2981 Opening balance Concept (Monetary) As Of Credit ifrs-full:LiabilityAssetOfDefinedBenefitPlans
2982 Interest income Concept (Monetary) For Period Credit ifrs-full:InterestExpenseIncomeNetDefinedBenefitLiabilityAsset
2983 Remeasurements: Return on plan assets excluding amounts included in interest income Concept (Monetary) For Period Credit ing:ReturnOnPlanAssetsNetDefinedBenefitLiabilityAssetAfterNetInterestIncome
2984 Employer's contribution Concept (Monetary) For Period Debit ifrs-full:ContributionsToPlanByEmployerNetDefinedBenefitLiabilityAsset
2985 Participants contributions Concept (Monetary) For Period Debit ifrs-full:ContributionsToPlanByPlanParticipantsNetDefinedBenefitLiabilityAsset
2986 Benefits paid Concept (Monetary) For Period Debit ifrs-full:BenefitsPaidOrPayable
2987 Exchange rate differences Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughChangesInForeignExchangeRatesNetDefinedBenefitLiabilityAsset
2988 Closing balance Concept (Monetary) As Of Credit ifrs-full:LiabilityAssetOfDefinedBenefitPlans
2989 Actual return on the plan assets Concept (Monetary) For Period Debit ifrs-full:ReturnOnPlanAssetsNetDefinedBenefitLiabilityAsset
2990 043503 - Disclosure - Pension and Other Post-Employment Benefits - Changes in defined benefit obligation and other post-employment benefits (Detail) Network

*

*

 http://www.ing.com/role/PensionAndOtherPostEmploymentBenefitsChangesInDefinedBenefitObligationAndOtherPostemploymentBenefitsDetail
2991 Disclosure of defined benefit plans [table] Table

*

*

 ifrs-full:DisclosureOfDefinedBenefitPlansTable
2992 Net defined benefit liability (asset) [axis] Axis ifrs-full:NetDefinedBenefitLiabilityAssetAxis
2993 Net defined benefit liability (asset) [member] Member ifrs-full:NetDefinedBenefitLiabilityAssetMember
2994 Defined benefit obligation [member] Member ifrs-full:PresentValueOfDefinedBenefitObligationMember
2995 Other post-employment benefits [member] Member ing:OtherPostEmploymentBenefitsMember
2996 Disclosure of defined benefit plans [line items] LineItems ifrs-full:DisclosureOfDefinedBenefitPlansLineItems
2997 Opening balance Concept (Monetary) As Of Credit ifrs-full:LiabilityAssetOfDefinedBenefitPlans
2998 Current service cost Concept (Monetary) For Period Credit ifrs-full:CurrentServiceCostNetDefinedBenefitLiabilityAsset
2999 Interest cost Concept (Monetary) For Period Credit ifrs-full:InterestExpenseIncomeNetDefinedBenefitLiabilityAsset
3000 Remeasurements: Actuarial gains and losses arising from changes in demographic assumptions Concept (Monetary) For Period Debit ifrs-full:ActuarialGainsLossesArisingFromChangesInDemographicAssumptionsNetDefinedBenefitLiabilityAsset
3001 Remeasurements: Actuarial gains and losses arising from changes in financial assumptions Concept (Monetary) For Period Debit ifrs-full:ActuarialGainsLossesArisingFromChangesInFinancialAssumptionsNetDefinedBenefitLiabilityAsset
3002 Participants' contributions Concept (Monetary) For Period Debit ifrs-full:ContributionsToPlanByPlanParticipantsNetDefinedBenefitLiabilityAsset
3003 Benefits paid Concept (Monetary) For Period Debit ifrs-full:BenefitsPaidOrPayable
3004 Past service cost Concept (Monetary) For Period Credit ifrs-full:PastServiceCostNetDefinedBenefitLiabilityAsset
3005 Effect of curtailment or settlement Concept (Monetary) For Period Debit ifrs-full:GainsLossesArisingFromSettlementsNetDefinedBenefitLiabilityAsset
3006 Exchange rate differences Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughChangesInForeignExchangeRatesNetDefinedBenefitLiabilityAsset
3007 Changes in composition of the group and other charges Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughOtherChangesNetDefinedBenefitLiabilityAsset
3008 Closing balance Concept (Monetary) As Of Credit ifrs-full:LiabilityAssetOfDefinedBenefitPlans
3009 043504 - Disclosure - Pension and Other Post-Employment Benefits - Changes in the net defined benefit assets/liability remeasurement reserve (Detail) Network

*

*

 http://www.ing.com/role/PensionAndOtherPostEmploymentBenefitsChangesInTheNetDefinedBenefitAssetsliabilityRemeasurementReserveDetail
3010 Disclosure of net defined benefit liability (asset) [table] Table

*

*

 ifrs-full:DisclosureOfNetDefinedBenefitLiabilityAssetTable
3011 Net defined benefit liability (asset) [axis] Axis ifrs-full:NetDefinedBenefitLiabilityAssetAxis
3012 Net defined benefit liability (asset) [member] Member ifrs-full:NetDefinedBenefitLiabilityAssetMember
3013 Plan assets [member] Member ifrs-full:PlanAssetsMember
3014 Disclosure of net defined benefit liability (asset) [line items] LineItems ifrs-full:DisclosureOfNetDefinedBenefitLiabilityAssetLineItems
3015 Opening balance Concept (Monetary) As Of Credit ifrs-full:ReserveOfRemeasurementsOfDefinedBenefitPlans
3016 Remeasurement of plan assets Concept (Monetary) For Period Debit ifrs-full:GainLossOnRemeasurementOfNetDefinedBenefitLiabilityAsset
3017 Actuarial gains and losses arising from changes in demographic assumptions Concept (Monetary) For Period Debit ifrs-full:ActuarialGainsLossesArisingFromChangesInDemographicAssumptionsNetDefinedBenefitLiabilityAsset
3018 Actuarial gains and losses Concept (Monetary) For Period Debit ifrs-full:ActuarialGainsLossesArisingFromChangesInFinancialAssumptionsNetDefinedBenefitLiabilityAsset
3019 Taxation Concept (Monetary) For Period Credit ing:IncreaseDecreaseThroughChangesInTaxationNetDefinedBenefitLiabilityAsset
3020 Total Other comprehensive income movement for the year Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans
3021 Closing balance Concept (Monetary) As Of Credit ifrs-full:ReserveOfRemeasurementsOfDefinedBenefitPlans
3022 043505 - Disclosure - Pension and Other Post-Employment Benefits - Recognised in PL related to pension and other staff related benefits (Detail) Network

*

*

 http://www.ing.com/role/PensionAndOtherPostEmploymentBenefitsRecognisedInPLRelatedToPensionAndOtherStaffRelatedBenefitsDetail
3023 Disclosure of net defined benefit liability (asset) [table] Table

*

*

 ifrs-full:DisclosureOfNetDefinedBenefitLiabilityAssetTable
3024 Defined benefit plans [axis] Axis ifrs-full:DefinedBenefitPlansAxis
3025 Defined benefit plans [member] Member ifrs-full:DefinedBenefitPlansMember
3026 Net defined benefit assets liabilities [member] Member ing:NetDefinedBenefitAssetsLiabilitiesMember
3027 Other post-employment benefits [member] Member ing:OtherPostEmploymentBenefitMember
3028 Other [member] Member ing:OtherStaffRelatedBenefitCostsMember
3029 Total Member ing:NetDefinedBenefitAssetLiabilityPostRetirementAndOtherCostMember
3030 Disclosure of net defined benefit liability (asset) [line items] LineItems ifrs-full:DisclosureOfNetDefinedBenefitLiabilityAssetLineItems
3031 Current service cost Concept (Monetary) For Period Credit ifrs-full:CurrentServiceCostNetDefinedBenefitLiabilityAsset
3032 Past service cost Concept (Monetary) For Period Credit ifrs-full:PastServiceCostNetDefinedBenefitLiabilityAsset
3033 Net Interest cost Concept (Monetary) For Period Credit ifrs-full:InterestExpenseIncomeNetDefinedBenefitLiabilityAsset
3034 Effect of curtailment or settlement Concept (Monetary) For Period Debit ifrs-full:GainsLossesArisingFromSettlementsNetDefinedBenefitLiabilityAsset
3035 Other Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughOtherChangesNetDefinedBenefitLiabilityAsset
3036 Defined benefit plans Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseInNetDefinedBenefitLiabilityAsset
3037 Defined contribution plans Concept (Monetary) For Period Debit ifrs-full:ContributionsToPlanNetDefinedBenefitLiabilityAsset
3038 Pension costs and other staff-related benefit costs Concept (Monetary) For Period Debit ing:PensionCostsAndOtherStaffRelatedBenefitCosts
3039 043506 - Disclosure - Pension and Other Post Employment Benefits - Additional Information (Detail) Network

*

*

 http://www.ing.com/role/PensionAndOtherPostEmploymentBenefitsAdditionalInformationDetail
3040 Disclosure of defined benefit plans [table] Table

*

*

 ifrs-full:DisclosureOfDefinedBenefitPlansTable
3041 Maturity [axis] Axis ifrs-full:MaturityAxis
3042 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
3043 Return on plan assets [member] Member ing:ReturnOnPlanAssetsMember
3044 Contribution to pension plans [member] Member ing:ContributionToPensionPlansMember
3045 2019-2023 [Member] Member ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember
3046 2024-2028 [member] Member ifrs-full:LaterThanFiveYearsAndNotLaterThanTenYearsMember
3047 Net defined benefit liability (asset) [axis] Axis ifrs-full:NetDefinedBenefitLiabilityAssetAxis
3048 Net defined benefit liability (asset) [member] Member ifrs-full:NetDefinedBenefitLiabilityAssetMember
3049 Plan assets [member] Member ifrs-full:PlanAssetsMember
3050 Actuarial assumptions [axis] Axis ifrs-full:ActuarialAssumptionsAxis
3051 Actuarial assumptions [member] Member ifrs-full:ActuarialAssumptionsMember
3052 Actuarial assumption of discount rates [member] Member ifrs-full:ActuarialAssumptionOfDiscountRatesMember
3053 Actuarial assumption of mortality rates [member] Member ifrs-full:ActuarialAssumptionOfMortalityRatesMember
3054 Defined benefit plans [axis] Axis ifrs-full:DefinedBenefitPlansAxis
3055 Defined benefit plans [member] Member ifrs-full:DefinedBenefitPlansMember
3056 Net defined benefit assets liabilities [member] Member ing:NetDefinedBenefitAssetsLiabilitiesMember
3057 Other post-employment benefits [member] Member ing:OtherPostEmploymentBenefitsMember
3058 Disclosure of defined benefit plans [line items] LineItems ifrs-full:DisclosureOfDefinedBenefitPlansLineItems
3059 Description of direct investments held under defined benefit plans Concept (Text/String) For Period ing:DescriptionOfDirectInvestmentsHeldUnderDefinedBenefitPlans
3060 Expected return on the plan assets Concept (Monetary) For Period Debit ing:ExpectedReturnOnPlanAssetsNetDefinedBenefitLiabilityAsset
3061 Remeasurement of plan assets Concept (Monetary) For Period Debit ifrs-full:GainLossOnRemeasurementOfNetDefinedBenefitLiabilityAsset
3062 Actuarial gains and losses Concept (Monetary) For Period Debit ifrs-full:ActuarialGainsLossesArisingFromChangesInFinancialAssumptionsNetDefinedBenefitLiabilityAsset
3063 Accumulated amount of remeasurements recognized directly in Other comprehensive income (equity), before tax Concept (Monetary) For Period Credit ing:AccumulatedAmountOfRemeasurementsRecognizedDirectlyInOtherComprehensiveIncomeEquity
3064 Accumulated amount of remeasurements recognised directly in Other comprehensive income (equity), net of tax Concept (Monetary) As Of Credit ifrs-full:ReserveOfRemeasurementsOfDefinedBenefitPlans
3065 Net defined benefit asset/liability, discount rates Concept (Percent) As Of ing:WeightedAverageBasicActuarialAssumptionOfDiscountRatesOnNetDefinedBenefitAssetOrLiability
3066 Other post-employment benefits, discount rates Concept (Percent) As Of ing:WeightedAverageBasicActuarialAssumptionOfDiscountRatesOnOtherPostEmploymentBenefits
3067 Financial impact of increase Concept (Monetary) As Of Credit ifrs-full:IncreaseDecreaseInDefinedBenefitObligationDueToReasonablyPossibleIncreaseInActuarialAssumption
3068 Financial impact of decrease Concept (Monetary) As Of Credit ifrs-full:IncreaseDecreaseInDefinedBenefitObligationDueToReasonablyPossibleDecreaseInActuarialAssumption
3069 Expected contributions to pension plans Concept (Monetary) For Period Credit ifrs-full:EstimateOfContributionsExpectedToBePaidToPlan
3070 Defined benefit plans Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseInNetDefinedBenefitLiabilityAsset
3071 Other post-employment benefits Concept (Monetary) For Period Debit ifrs-full:PostemploymentBenefitExpenseDefinedBenefitPlans
3072 043507 - Disclosure - Pension and Other Post Employment Benefits - Additional Information (Parenthetical) (Detail) Network

*

*

 http://www.ing.com/role/PensionAndOtherPostEmploymentBenefitsAdditionalInformationParentheticalDetail
3073 Disclosure of defined benefit plans [table] Table

*

*

 ifrs-full:DisclosureOfDefinedBenefitPlansTable
3074 Actuarial assumptions [axis] Axis ifrs-full:ActuarialAssumptionsAxis
3075 Actuarial assumptions [member] Member ifrs-full:ActuarialAssumptionsMember
3076 Actuarial assumption of mortality rates [member] Member ifrs-full:ActuarialAssumptionOfMortalityRatesMember
3077 Disclosure of defined benefit plans [line items] LineItems ifrs-full:DisclosureOfDefinedBenefitPlansLineItems
3078 Change in discount rate assumption Concept (Percent) For Period ing:ChangeInDiscountRate
3079 043601 - Disclosure - Taxation - Summary of Changes in Deferred Tax (Detail) Network

*

*

 http://www.ing.com/role/TaxationSummaryOfChangesInDeferredTaxDetail
3080 Disclosure of temporary difference, unused tax losses and unused tax credits [table] Table

*

*

 ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable
3081 Assets and liabilities [axis] Axis ifrs-full:AssetsAndLiabilitiesAxis
3082 Assets and liabilities [member] Member ifrs-full:AssetsAndLiabilitiesMember
3083 Deferred tax liabilities [member] Member ing:DeferredTaxLiabilitiesMember
3084 Deferred tax assets [member] Member ing:DeferredTaxAssetsMember
3085 Net deferred tax [member] Member ing:NetDeferredTaxMember
3086 Temporary difference, unused tax losses and unused tax credits [axis] Axis ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis
3087 Temporary difference, unused tax losses and unused tax credits [member] Member ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember
3088 Unused tax losses carried forward [member] Member ifrs-full:UnusedTaxLossesMember
3089 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
3090 Financial instruments, class [member] Member ifrs-full:ClassesOfFinancialInstrumentsMember
3091 Pension and post-employment benefits [member] Member ing:PensionAndPostemploymentBenefitsMember
3092 Receivables [member] Member ing:ReceivablesMember
3093 Loans and advances to customers [member] Member ing:LoansAndAdvancesToCustomersMember
3094 Classes of other provisions [axis] Axis ifrs-full:ClassesOfProvisionsAxis
3095 Other Provisions [Member] Member ifrs-full:OtherProvisionsMember
3096 Other provisions [member] Member ing:OtherProvisionMember
3097 Types of hedges [axis] Axis ifrs-full:TypesOfHedgesAxis
3098 Hedges [member] Member ifrs-full:TypesOfHedgesMember
3099 Cash flow hedges [member] Member ifrs-full:CashFlowHedgesMember
3100 Categories of financial liabilities [axis] Axis ifrs-full:CategoriesOfFinancialLiabilitiesAxis
3101 Financial liabilities, category [member] Member ifrs-full:FinancialLiabilitiesCategoryMember
3102 Financial liabilities at fair value through profit or loss [member] Member ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember
3103 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
3104 Assets [member] Member ifrs-full:ClassesOfAssetsMember
3105 Investments [member] Member ing:InvestmentMember
3106 Investment properties [member] Member ifrs-full:InvestmentPropertyMember
3107 Depreciation [member] Member ing:DepreciationMember
3108 Other [member] Member ing:OtherMember
3109 Disclosure of temporary difference, unused tax losses and unused tax credits [line items] LineItems ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems
3110 Net liability (-) Net asset (+), Beginning balance Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilityAsset
3111 Adjustments opening Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseInDeferredTaxLiabilityAsset
3112 Change through equity Concept (Monetary) For Period ifrs-full:DeferredTaxRelatingToItemsChargedOrCreditedDirectlyToEquity
3113 Change through net result Concept (Monetary) For Period ifrs-full:DeferredTaxExpenseIncomeRecognisedInProfitOrLoss
3114 Exchange rate differences Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughNetExchangeDifferencesDeferredTaxLiabilityAsset
3115 Changes in the composition of the group and other changes Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughBusinessCombinationsDeferredTaxLiabilityAsset
3116 Net liability (-) Net asset (+), Ending balance Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilityAsset
3117 043602 - Disclosure - Taxation - Summary of Deferred Tax in Connection With Unused Tax Losses Carried Forward (Detail) Network

*

*

 http://www.ing.com/role/TaxationSummaryOfDeferredTaxInConnectionWithUnusedTaxLossesCarriedForwardDetail
3118 Implied Table Table

*

*

 implied:Table
3119 Disclosure of taxation [abstract] Abstract ing:DisclosureOfTaxationAbstract
3120 Changes in deferred tax liability (asset) [abstract] Abstract ifrs-full:ChangesInDeferredTaxLiabilityAssetAbstract
3121 Total unused tax losses carried forward Concept (Monetary) For Period Credit ing:UnusedTaxLossesCarriedForward
3122 Unused tax losses carried forward not recognised as a deferred tax asset Concept (Monetary) As Of ifrs-full:UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised
3123 Unused tax losses carried forward recognised as a deferred tax asset Concept (Monetary) For Period Debit ing:UnusedTaxLossesCarriedForwardRecognisedAsDeferredTaxAsset
3124 Average tax rate Concept (Percent) For Period ing:AverageEffectiveDeferredTaxRate
3125 Deferred tax asset Concept (Monetary) As Of Debit ing:DeferredTaxInConnectionWithUnusedTaxLossesCarriedForward
3126 043603 - Disclosure - Taxation - Summary of Total Unused Tax Losses Carried Forward Analysed by Expiry Terms (Detail) Network

*

*

 http://www.ing.com/role/TaxationSummaryOfTotalUnusedTaxLossesCarriedForwardAnalysedByExpiryTermsDetail
3127 Disclosure of temporary difference, unused tax losses and unused tax credits [table] Table

*

*

 ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable
3128 Maturity [axis] Axis ifrs-full:MaturityAxis
3129 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
3130 Within 1 year [member] Member ifrs-full:NotLaterThanOneYearMember
3131 More than 1 year but less than 5 years [member] Member ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember
3132 - more than 5 years but less than 10 years [member] Member ifrs-full:LaterThanFiveYearsAndNotLaterThanTenYearsMember
3133 More than 10 years but less than 20 years [member] Member ing:MoreThanTenYearsButLessThanTwentyYearsMember
3134 Unlimited [member] Member ing:UnlimitedMember
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3136 No deferred tax asset recognised Concept (Monetary) As Of ifrs-full:UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised
3137 Deferred tax asset recognised Concept (Monetary) As Of Debit ing:UnusedTaxLossesForWhichDeferredTaxAssetRecognised
3138 043604 - Disclosure - Taxation - Breakdown of certain net deferred tax asset positions by jurisdiction (Detail) Network

*

*

 http://www.ing.com/role/TaxationBreakdownOfCertainNetDeferredTaxAssetPositionsByJurisdictionDetail
3139 Disclosure of temporary difference, unused tax losses and unused tax credits [table] Table

*

*

 ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable
3140 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
3141 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
3142 Italy [member] Member country:IT
3143 Disclosure of temporary difference, unused tax losses and unused tax credits [line items] LineItems ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems
3144 Certain deferred tax assets Concept (Monetary) As Of Debit ifrs-full:DeferredTaxAssetWhenUtilisationIsDependentOnFutureTaxableProfitsInExcessOfProfitsFromReversalOfTaxableTemporaryDifferencesAndEntityHasSufferedLossInJurisdictionToWhichDeferredTaxAssetRelates
3145 043605 - Disclosure - Taxation - Statement of Profit or Loss of Taxation (Detail) Network

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*

 http://www.ing.com/role/TaxationStatementOfProfitOrLossOfTaxationDetail
3146 Disclosure Of Income Taxes [Table] Table

*

*

 ing:DisclosureOfIncomeTaxesTable
3147 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
3148 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
3149 Netherlands [member] Member country:NL
3150 International [member] Member ifrs-full:ForeignCountriesMember
3151 Disclosure Of Income Taxes [Line Items] LineItems ing:DisclosureOfIncomeTaxesLineItems
3152 Current taxation Concept (Monetary) For Period Debit ifrs-full:CurrentTaxExpenseIncome
3153 Deferred taxation Concept (Monetary) For Period ifrs-full:DeferredTaxExpenseIncomeRecognisedInProfitOrLoss
3154 Effective tax amount Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
3155 043606 - Disclosure - Taxation - Reconciliation of Weighted Average Statutory Income Tax Rate To Effective Income Tax Rate (Detail) Network

*

*

 http://www.ing.com/role/TaxationReconciliationOfWeightedAverageStatutoryIncomeTaxRateToEffectiveIncomeTaxRateDetail
3156 Implied Table Table

*

*

 implied:Table
3157 Disclosure of taxation [abstract] Abstract ing:DisclosureOfTaxationAbstract
3158 Reconciliation of average effective tax rate and applicable tax rate [abstract] Abstract ifrs-full:ReconciliationOfAverageEffectiveTaxRateAndApplicableTaxRateAbstract
3159 Result before tax from continuing operations Concept (Monetary) For Period Credit ifrs-full:AccountingProfit
3160 Weighted average statutory tax rate Concept (Percent) For Period ifrs-full:ApplicableTaxRate
3161 Weighted average statutory tax amount Concept (Monetary) For Period Debit ifrs-full:TaxExpenseIncomeAtApplicableTaxRate
3162 Participation exemption Concept (Monetary) For Period Credit ifrs-full:TaxEffectOfRevenuesExemptFromTaxation2011
3163 Other income not subject to tax Concept (Monetary) For Period Credit ing:TaxEffectOfOtherIncomeNotSubjectToTax
3164 Expenses not deductible for tax purposes Concept (Monetary) For Period Debit ifrs-full:TaxEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss
3165 Impact on deferred tax from change in tax rates Concept (Monetary) For Period Debit ifrs-full:TaxEffectFromChangeInTaxRate
3166 Deferred tax benefit from previously unrecognised amounts Concept (Monetary) For Period Credit ifrs-full:TaxBenefitArisingFromPreviouslyUnrecognisedTaxLossTaxCreditOrTemporaryDifferenceOfPriorPeriodUsedToReduceDeferredTaxExpense
3167 Current tax from previously unrecognised amounts Concept (Monetary) For Period Credit ifrs-full:TaxBenefitArisingFromPreviouslyUnrecognisedTaxLossTaxCreditOrTemporaryDifferenceOfPriorPeriodUsedToReduceCurrentTaxExpense
3168 Write-off/reversal of deferred tax assets Concept (Monetary) For Period Debit ing:TaxEffectFromWriteOffOrReversalOfDeferredTaxAssets
3169 State and local taxes Concept (Monetary) For Period Credit ing:TaxEffectOfStateAndLocalTaxses
3170 Adjustment to prior periods Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForCurrentTaxOfPriorPeriod
3171 Effective tax amount Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
3172 Effective tax rate Concept (Percent) For Period ifrs-full:AverageEffectiveTaxRate
3173 043607 - Disclosure - Taxation - Income Tax Related to Other Comprehensive Income (Detail) Network

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*

 http://www.ing.com/role/TaxationIncomeTaxRelatedToOtherComprehensiveIncomeDetail
3174 Implied Table Table

*

*

 implied:Table
3175 Disclosure of income taxes [abstract] Abstract ing:DisclosureOfIncomeTaxesAbstract
3176 Income tax related to components of other comprehensive income [abstract] Abstract ifrs-full:IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossAbstract
3177 Unrealised revaluations available-for-sale investments and other revaluations Concept (Monetary) For Period Debit ifrs-full:IncomeTaxRelatingToAvailableforsaleFinancialAssetsOfOtherComprehensiveIncome
3178 Realised gains/losses transferred to the statement of profit or loss (reclassifications from equity to profit or loss) Concept (Monetary) For Period Debit ing:IncomeTaxRelatingToRealisedGainsLossesTransferredToStatementOfProfitOrLoss
3179 Changes in cash flow hedge reserve Concept (Monetary) For Period Debit ifrs-full:IncomeTaxRelatingToCashFlowHedgesOfOtherComprehensiveIncome
3180 Remeasurement of the net defined benefit asset/liability Concept (Monetary) For Period Debit ifrs-full:IncomeTaxRelatingToRemeasurementsOfDefinedBenefitPlansOfOtherComprehensiveIncome
3181 Exchange rate differences and other Concept (Monetary) For Period Debit ifrs-full:IncomeTaxRelatingToExchangeDifferencesOnTranslationOfOtherComprehensiveIncome
3182 Changes in composition of the group and other changes Concept (Monetary) For Period Debit ing:IncomeTaxRelatingToChangesInCompositionOfGroupAndOtherChanges
3183 Total income tax related to components of other comprehensive income Concept (Monetary) For Period ifrs-full:IncomeTaxRelatingToComponentsOfOtherComprehensiveIncome
3184 043608 - Disclosure - Taxation - Additional Information (Detail) Network

*

*

 http://www.ing.com/role/TaxationAdditionalInformationDetail
3185 Disclosure of temporary difference, unused tax losses and unused tax credits [table] Table

*

*

 ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable
3186 Assets and liabilities [axis] Axis ifrs-full:AssetsAndLiabilitiesAxis
3187 Assets and liabilities [member] Member ifrs-full:AssetsAndLiabilitiesMember
3188 Deferred tax liabilities [member] Member ing:DeferredTaxLiabilitiesMember
3189 Deferred tax assets [member] Member ing:DeferredTaxAssetsMember
3190 Net deferred tax [member] Member ing:NetDeferredTaxMember
3191 Temporary difference, unused tax losses and unused tax credits [axis] Axis ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis
3192 Temporary difference, unused tax losses and unused tax credits [member] Member ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember
3193 Unused tax losses carried forward [member] Member ifrs-full:UnusedTaxLossesMember
3194 Classes of other provisions [axis] Axis ifrs-full:ClassesOfProvisionsAxis
3195 Other provisions [member] Member ifrs-full:OtherProvisionsMember
3196 Other provisions [member] Member ifrs-full:MiscellaneousOtherProvisionsMember
3197 Belgian reorganization provision [Member] Member ing:BelgianReorganizationProvisionMember
3198 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
3199 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
3200 Payvision [member] Member ing:PayvisionMember
3201 Disclosure of temporary difference, unused tax losses and unused tax credits [line items] LineItems ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems
3202 Certain deferred tax assets Concept (Monetary) As Of Debit ifrs-full:DeferredTaxAssetWhenUtilisationIsDependentOnFutureTaxableProfitsInExcessOfProfitsFromReversalOfTaxableTemporaryDifferencesAndEntityHasSufferedLossInJurisdictionToWhichDeferredTaxAssetRelates
3203 Effective tax rate Concept (Percent) For Period ifrs-full:AverageEffectiveTaxRate
3204 Deferred tax liability (asset) Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilityAsset
3205 Deferred tax asset Concept (Monetary) As Of Debit ing:DeferredTaxInConnectionWithUnusedTaxLossesCarriedForward
3206 Deferred tax liability due to recapture of previously deducted tax losses Concept (Monetary) As Of Credit ing:DeferredTaxLiabilityDueToRecaptureOfPreviouslyDeductedTaxLosses
3207 Change in deferred tax Concept (Monetary) For Period ifrs-full:DeferredTaxExpenseIncomeRecognisedInProfitOrLoss
3208 Changes in the composition of the group and other changes Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughBusinessCombinationsDeferredTaxLiabilityAsset
3209 Expenses not deductible for tax purposes Concept (Monetary) For Period Debit ifrs-full:TaxEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss
3210 Tax effect of non-deductible expenses on regulatory issues Concept (Monetary) For Period Debit ing:TaxEffectOfNonDeductibleExpensesOnRegulatoryIssues
3211 043701 - Disclosure - Fair Value of Assets and Liabilities - Summary of Financial Assets and Liabilities (Detail) Network

*

*

 http://www.ing.com/role/FairValueOfAssetsAndLiabilitiesSummaryOfFinancialAssetsAndLiabilitiesDetail
3212 Disclosure of Fair Value Measurement of Assets and Liabilities [Table] Table

*

*

 ing:DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable
3213 Measurement [axis] Axis ifrs-full:MeasurementAxis
3214 Aggregated measurement [member] Member ifrs-full:AggregatedMeasurementMember
3215 Estimated fair value [member] Member ifrs-full:AtFairValueMember
3216 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
3217 Assets [member] Member ifrs-full:ClassesOfAssetsMember
3218 Other equity securities [member] Member ifrs-full:OtherEquitySecuritiesMember
3219 Equity securities [member] Member ifrs-full:EquityInvestmentsMember
3220 Debt securities [member] Member ifrs-full:DebtSecuritiesMember
3221 Loans And Advances [Member] Member ing:LoansAndAdvancesMember
3222 Securities [Member] Member ing:SecuritiesMember
3223 Disclosure of fair value measurement of assets and liabilities [Line Items] LineItems ing:DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems
3224 Financial Assets Abstract ifrs-full:DisclosureOfFinancialAssetsAbstract
3225 Cash and balances with central banks Concept (Monetary) As Of Debit ifrs-full:CashAndBankBalancesAtCentralBanks
3226 Loans and advances to banks Concept (Monetary) As Of Debit ifrs-full:LoansAndAdvancesToBanks
3227 Financial assets at fair value through profit or loss Abstract ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossAbstract
3228 - trading assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTrading
3229 - non-trading derivatives Concept (Monetary) As Of Debit ing:FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForNonTradingDerivatives
3230 - Assets mandatorily at fair value through profit or loss Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossMandatorilyMeasuredAtFairValue
3231 - Assets designated as at fair value through profit or loss Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossDesignatedAsUponInitialRecognition
3232 Investments Abstract ing:InvestmentAbstract
3233 Available-for-sale investments Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAvailableforsale
3234 Held-to-maturity investments Concept (Monetary) As Of Debit ifrs-full:HeldtomaturityInvestments
3235 Financial assets at fair value through other comprehensive income [abstract] Abstract ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeAbstract
3236 Financial assets at fair value through other comprehensive income Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncome
3237 Loans and advances to customers Concept (Monetary) As Of Debit ifrs-full:LoansAndAdvancesToCustomers
3238 Securities at AC Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtAmortisedCost
3239 Other assets Concept (Monetary) As Of Debit ing:FinancialAssetsAtFairValueThroughProfitOrLossOtherAssets
3240 Total Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
3241 Financial liabilities Abstract ifrs-full:DisclosureOfFinancialLiabilitiesAbstract
3242 Deposits from banks Concept (Monetary) As Of Credit ifrs-full:DepositsFromBanks
3243 Customer deposits Concept (Monetary) As Of Credit ifrs-full:DepositsFromCustomers
3244 Financial liabilities at fair value through profit or loss Abstract ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossAbstract
3245 - trading liabilities Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossClassifiedAsHeldForTrading
3246 - non-tradingderivatives Concept (Monetary) As Of Credit ing:FinancialLiabilitiesAtFairValueThroughProfitOrLossClassifiedAsHeldForNonTradingDerivatives
3247 - designated at fair value through profit or loss Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedAsUponInitialRecognition
3248 Other liabilities Concept (Monetary) As Of Credit ing:OtherLiabilitiesExcludesEmployeeBenefitLiabilitiesAndOtherTaxationAndSocialSecurityContributions
3249 Debt securities in issue Concept (Monetary) As Of Credit ifrs-full:DebtSecurities
3250 Subordinated loans Concept (Monetary) As Of Credit ifrs-full:SubordinatedLiabilities
3251 Total Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilities
3252 043702 - Disclosure - Fair Value of Assets and Liabilities - Methods applied in determining fair values of financial assets, liabilities (Detail) Network

*

*

 http://www.ing.com/role/FairValueOfAssetsAndLiabilitiesMethodsAppliedInDeterminingFairValuesOfFinancialAssetsLiabilitiesDetail
3253 Disclosure of Fair Value Measurement of Assets and Liabilities [Table] Table

*

*

 ing:DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable
3254 Levels of fair value hierarchy [axis] Axis ifrs-full:LevelsOfFairValueHierarchyAxis
3255 All levels of fair value hierarchy [member] Member ifrs-full:AllLevelsOfFairValueHierarchyMember
3256 Level 1 [member] Member ifrs-full:Level1OfFairValueHierarchyMember
3257 Level 2 [member] Member ifrs-full:Level2OfFairValueHierarchyMember
3258 Level 3 [member] Member ifrs-full:Level3OfFairValueHierarchyMember
3259 Disclosure of fair value measurement of assets and liabilities [Line Items] LineItems ing:DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems
3260 Financial Assets Abstract ifrs-full:DisclosureOfFinancialAssetsAbstract
3261 - trading assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTrading
3262 - non-trading derivatives Concept (Monetary) As Of Debit ing:FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForNonTradingDerivatives
3263 - Assets mandatorily at fair value through profit or loss Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossMandatorilyMeasuredAtFairValue
3264 - Assets designated as at fair value through profit or loss Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossDesignatedAsUponInitialRecognition
3265 Available-for-sale investments Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAvailableforsale
3266 Financial assets at fair value through other comprehensive income Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncome
3267 Fair value Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValue
3268 Financial liabilities Abstract ifrs-full:DisclosureOfFinancialLiabilitiesAbstract
3269 Trading liabilities Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossClassifiedAsHeldForTrading
3270 Non-trading derivatives Concept (Monetary) As Of Credit ing:FinancialLiabilitiesAtFairValueThroughProfitOrLossClassifiedAsHeldForNonTradingDerivatives
3271 Financial liabilities designated as at fair value through profit or loss Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedAsUponInitialRecognition
3272 Fair value Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesAtFairValue
3273 043703 - Disclosure - Fair Value of Assets and Liabilities - Changes in Level 3 Financial Assets (Detail) Network

*

*

 http://www.ing.com/role/FairValueOfAssetsAndLiabilitiesChangesInLevel3FinancialAssetsDetail
3274 Disclosure of fair value measurement of assets [table] Table

*

*

 ifrs-full:DisclosureOfFairValueMeasurementOfAssetsTable
3275 Levels of fair value hierarchy [axis] Axis ifrs-full:LevelsOfFairValueHierarchyAxis
3276 All levels of fair value hierarchy [member] Member ifrs-full:AllLevelsOfFairValueHierarchyMember
3277 Level 3 [member] Member ifrs-full:Level3OfFairValueHierarchyMember
3278 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
3279 Assets [member] Member ifrs-full:ClassesOfAssetsMember
3280 Trading assets [member] Member ing:TradingAssetsMember
3281 Non-trading derivatives [member] Member ing:NonTradingDerivativesAssetsMember
3282 Available-for-sale of investments [member] Member ing:AvailableForSaleOfInvestmentsMember
3283 Categories of financial assets [axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
3284 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
3285 Mandatorily measured at fair value through profit or loss [member] Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossMandatorilyMeasuredAtFairValueCategoryMember
3286 Financial assets at FVPL [member] Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember
3287 Financial assets at FVOCI [member] Member ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember
3288 Disclosure of fair value measurement of assets [line items] LineItems ifrs-full:DisclosureOfFairValueMeasurementOfAssetsLineItems
3289 Opening balance Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValue
3290 Effect of changes in accounting policies Concept (Monetary) For Period Debit ing:EffectOfChangeInAccountingPolicyFinancialAssetIfrs9
3291 Realised gain/loss recognised in the statement of profit or loss during the period1,3 Concept (Monetary) For Period ifrs-full:GainsLossesRecognisedInProfitOrLossFairValueMeasurementAssets
3292 Revaluation recognised in other comprehensive income during the period2,4 Concept (Monetary) For Period ifrs-full:GainsLossesRecognisedInOtherComprehensiveIncomeFairValueMeasurementAssets
3293 Purchase of assets Concept (Monetary) For Period Debit ifrs-full:PurchasesFairValueMeasurementAssets
3294 Sale of assets Concept (Monetary) For Period Credit ifrs-full:SalesFairValueMeasurementAssets
3295 Maturity/settlement Concept (Monetary) For Period Credit ifrs-full:SettlementsFairValueMeasurementAssets
3296 Reclassifications Concept (Monetary) For Period Debit ing:ReclassificationFairValueMeasurementAssets
3297 Transfers into Level 3 Concept (Monetary) For Period Debit ifrs-full:TransfersIntoLevel3OfFairValueHierarchyAssets
3298 Transfers out of Level 3 Concept (Monetary) For Period Credit ifrs-full:TransfersOutOfLevel3OfFairValueHierarchyAssets
3299 Exchange rate differences Concept (Monetary) For Period Debit ing:ExchangeRateDifferencesFairValueMeasurementAssets
3300 Changes in the composition of the group and other changes Concept (Monetary) For Period Debit ing:ChangesInCompositionOfGroupAndOtherChanges
3301 Closing balance Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValue
3302 043704 - Disclosure - Fair Value of Assets and Liabilities - Changes in Level 3 Financial liabilities (Detail) Network

*

*

 http://www.ing.com/role/FairValueOfAssetsAndLiabilitiesChangesInLevel3FinancialLiabilitiesDetail
3303 Disclosure of fair value measurement of liabilities [table] Table

*

*

 ifrs-full:DisclosureOfFairValueMeasurementOfLiabilitiesTable
3304 Levels of fair value hierarchy [axis] Axis ifrs-full:LevelsOfFairValueHierarchyAxis
3305 All levels of fair value hierarchy [member] Member ifrs-full:AllLevelsOfFairValueHierarchyMember
3306 Level 3 [member] Member ifrs-full:Level3OfFairValueHierarchyMember
3307 Classes of liabilities [axis] Axis ifrs-full:ClassesOfLiabilitiesAxis
3308 Liabilities [member] Member ifrs-full:LiabilitiesMember
3309 Trading liabilities [member] Member ing:TradingLiabilities1Member
3310 Non-trading derivatives liabilities [member] Member ing:NonTradingDerivativesLiabilitiesMember
3311 Financial liabilities designated as at fair value through profit and loss [member] Member ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember
3312 Disclosure of fair value measurement of liabilities [line items] LineItems ifrs-full:DisclosureOfFairValueMeasurementOfLiabilitiesLineItems
3313 Opening balance Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesAtFairValue
3314 Effect of changes in accounting policy Concept (Monetary) For Period Credit ing:EffectOfChangeInAccountingPolicyFinancialLiabilitiesifrs9
3315 Realised gain/loss recognised in the statement of profit or loss during the period1,2 Concept (Monetary) For Period ifrs-full:GainsLossesRecognisedInProfitOrLossFairValueMeasurementLiabilities
3316 Issue of liabilities Concept (Monetary) For Period Credit ifrs-full:IssuesFairValueMeasurementLiabilities
3317 Early repayment of liabilities Concept (Monetary) For Period Credit ing:EarlyRepaymentOfLiabilitiesFairValue
3318 Maturity/settlement Concept (Monetary) For Period Debit ifrs-full:SettlementsFairValueMeasurementLiabilities
3319 Transfers into Level 3 Concept (Monetary) For Period Credit ifrs-full:TransfersIntoLevel3OfFairValueHierarchyLiabilities
3320 Transfers out of Level 3 Concept (Monetary) For Period Debit ifrs-full:TransfersOutOfLevel3OfFairValueHierarchyLiabilities
3321 Exchange rate differences Concept (Monetary) For Period Credit ing:ExchangeRateDifferenceFairValueMeasurementLiabilities
3322 Changes in the composition of the group and other changes Concept (Monetary) For Period Debit ing:ChangesInCompositionOfFinancialLiabilitiesAtFairValue
3323 Closing balance Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesAtFairValue
3324 043705 - Disclosure - Fair Value of Assets and Liabilities - Amounts Recognised in the Statement of Profit or Loss (Detail) Network

*

*

 http://www.ing.com/role/FairValueOfAssetsAndLiabilitiesAmountsRecognisedInTheStatementOfProfitOrLossDetail
3325 Disclosure of fair value measurement of assets [table] Table

*

*

 ifrs-full:DisclosureOfFairValueMeasurementOfAssetsTable
3326 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
3327 Assets [member] Member ifrs-full:ClassesOfAssetsMember
3328 Held at balance sheet date [member] Member ing:HeldAtBalanceMember
3329 Derecognised during the year [member] Member ing:DerecognisedMember
3330 Categories of financial assets [axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
3331 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
3332 Trading assets [member] Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTradingCategoryMember
3333 Non-trading derivatives [member] Member ing:NonTradingDerivativesAssetsMember
3334 - Assets mandatorily at fair value through profit or loss [member] Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossMandatorilyMeasuredAtFairValueCategoryMember
3335 Assets designated at fair value through profit or loss [member] Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember
3336 Available-for-sale [member] Member ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
3337 Financial assets at fair value through other comprehensive income, category [member] Member ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember
3338 Levels of fair value hierarchy [axis] Axis ifrs-full:LevelsOfFairValueHierarchyAxis
3339 All levels of fair value hierarchy [member] Member ifrs-full:AllLevelsOfFairValueHierarchyMember
3340 Level 3 [member] Member ifrs-full:Level3OfFairValueHierarchyMember
3341 Categories of financial liabilities [axis] Axis ifrs-full:CategoriesOfFinancialLiabilitiesAxis
3342 Financial liabilities, category [member] Member ifrs-full:FinancialLiabilitiesCategoryMember
3343 Trading liabilities [member] Member ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossThatMeetDefinitionOfHeldForTradingCategoryMember
3344 Non-trading derivatives liabilities [member] Member ing:NonTradingDerivativesLiabilitiesMember
3345 Financial liabilities designated as at fair value through profit and loss [member] Member ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember
3346 Disclosure of fair value measurement of assets [line items] LineItems ifrs-full:DisclosureOfFairValueMeasurementOfAssetsLineItems
3347 Financial Assets Abstract ifrs-full:DisclosureOfFinancialAssetsAbstract
3348 Financial assets, amounts recognized in income statement Concept (Monetary) For Period ifrs-full:GainsLossesRecognisedInProfitOrLossFairValueMeasurementAssets
3349 Financial liabilities Abstract ifrs-full:DisclosureOfFinancialLiabilitiesAbstract
3350 Financial liabilities, amounts recognized in income statement Concept (Monetary) For Period ifrs-full:GainsLossesRecognisedInProfitOrLossFairValueMeasurementLiabilities
3351 043706 - Disclosure - Fair Value of Assets and Liabilities - Valuation Techniques and Range of Unobservable Inputs (Detail) Network

*

*

 http://www.ing.com/role/FairValueOfAssetsAndLiabilitiesValuationTechniquesAndRangeOfUnobservableInputsDetail
3352 Disclosure of significant unobservable inputs used in fair value measurement of assets [table] Table

*

*

 ifrs-full:DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsTable
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3356 Range [axis] Axis ifrs-full:RangeAxis
3357 Ranges [member] Member ifrs-full:RangesMember
3358 Minimum [member] Member ifrs-full:BottomOfRangeMember
3359 Maximum [member] Member ifrs-full:TopOfRangeMember
3360 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
3361 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
3362 Equity securities [member] Member ifrs-full:EquityInvestmentsMember
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3365 Debt securities [member] Member ifrs-full:DebtSecuritiesMember
3366 Measurement [axis] Axis ifrs-full:MeasurementAxis
3367 Aggregated measurement [member] Member ifrs-full:AggregatedMeasurementMember
3368 Price (%) [member] Member ing:PriceMember
3369 Credit spread (BPS) [member] Member ing:CreditSpreadMember
3370 Equity volatility (%) [member] Member ing:EquityVolatilityMember
3371 Equity/FX correlation [member] Member ing:EquityAndForeignExchangeCorrelationMember
3372 Dividend yield (%) [member] Member ing:DividendYieldMember
3373 Interest rate volatility (%) [member] Member ing:InterestRateVolatilityMember
3374 IR/IR correlation [Member] Member ing:IrirCorrelationMember
3375 Implied correlation [member] Member ing:ImpliedCorrelationMember
3376 Interest rate correlation [member] Member ing:InterestRateCorrelationMember
3377 IR/INF correlation [member] Member ing:IrAndInfCorrelationMember
3378 Reset spread (%) [member] Member ing:ResetSpreadMember
3379 Prepayment rate (%) [member] Member ing:PrepaymentRateMember
3380 Inflation rate (%) [member] Member ing:InflationRateMember
3381 Jump rate (%) [member] Member ing:JumpRateMember
3382 Equity/equity correlation [member] Member ing:EquityAndEquityCorrelationOneMember
3383 Commodity volatility [member] Member ing:CommodityVolatilityMember
3384 Com/com correlation [member] Member ing:ComAndComCorrelationMember
3385 Com/FX correlation [member] Member ing:ComAndForeignExchangeCorrelationMember
3386 Other [member] Member ing:OtherMeasurementMember
3387 Classes of entity's own equity instruments [axis] Axis ifrs-full:ClassesOfEntitysOwnEquityInstrumentsAxis
3388 Entity's own equity instruments [member] Member ifrs-full:EntitysOwnEquityInstrumentsMember
3389 Loans and advances [member] Member ing:LoansAndAdvancesMember
3390 Reverse (Repos) [Member] Member ing:ReverseReposMember
3391 Structured notes [member] Member ing:StructuredNotesMember
3392 Derivatives at rates [member] Member ing:DerivativesAtRatesMember
3393 Derivatives at foreign exchange [member] Member ing:DerivativesAtForeignExchangeMember
3394 Derivative at credit [member] Member ing:DerivativeAtCreditMember
3395 Derivatives at equity [member] Member ing:DerivativesAtEquityMember
3396 Other derivatives [member] Member ing:OtherDerivativesMember
3397 Available for sale debt securities [member] Member ing:AvailableForSaleAtDebtMember
3398 Available for sale at equity [member] Member ing:AvailableForSaleAtEquityMember
3399 Available for sale [member] Member ing:AvailableForSaleMember
3400 Debt at fair value through other comprehensive income [Member] Member ing:DebtAtFairValueThroughOtherComprehensiveIncomeMember
3401 Loan and advances at fair value through other comprehensive income [Member] Member ing:LoanAndAdvancesAtFairValueThroughOtherComprehensiveIncomeMember
3402 Equity, at fair value through other comprehensive income [Member] Member ing:EquityAtFairValueThroughOtherComprehensiveIncomeMember
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3405 Price based [member] Member ing:PriceBasedMember
3406 Net asset value [member] Member ing:NetAssetValueMember
3407 Present value techniques [member] Member ing:PresentValueTechniquesMember
3408 Loan pricing model [Member] Member ing:LoanPricingModelMember
3409 Option pricing model [member] Member ifrs-full:OptionPricingModelMember
3410 Discounted cash flow [member] Member ifrs-full:DiscountedCashFlowMember
3411 Multiplier method [member] Member ing:MultiplierMethodMember
3412 Comparable transactions [member] Member ifrs-full:MarketComparablePricesMember
3413 Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] LineItems ifrs-full:DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsLineItems
3414 Assets, at fair value through profit or loss Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLoss
3415 Liabilities, at fair value through profit or loss Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLoss
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3417 Significant unobservable inputs, credit spread Concept (Percent) For Period ing:SignificantUnobservableInputsCreditSpread
3418 Significant unobservable inputs,correlation Concept (Decimal) For Period ing:SignificantUnobservableInputsAmount
3419 Significant unobservable inputs, weighted average life Concept (xbrli:durationItemType) For Period ing:InterestRateSignificantUnobservableInputsPeriod
3420 043707 - Disclosure - Fair Value of Assets and Liabilities - Sensitivity analysis of Level 3 instruments (Detail) Network

*

*

 http://www.ing.com/role/FairValueOfAssetsAndLiabilitiesSensitivityAnalysisOfLevel3InstrumentsDetail
3421 Disclosure of fair value measurement of assets [table] Table

*

*

 ifrs-full:DisclosureOfFairValueMeasurementOfAssetsTable
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3424 Equity securities [member] Member ifrs-full:EquityInvestmentsMember
3425 Levels of fair value hierarchy [axis] Axis ifrs-full:LevelsOfFairValueHierarchyAxis
3426 All levels of fair value hierarchy [member] Member ifrs-full:AllLevelsOfFairValueHierarchyMember
3427 Level 3 [member] Member ifrs-full:Level3OfFairValueHierarchyMember
3428 Categories of financial assets [axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
3429 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
3430 Financial assets at fair value through profit or loss [member] Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember
3431 Available-for-sale [member] Member ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
3432 Financial assets at fair value through other comprehensive income, category [member] Member ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember
3433 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
3434 Assets [member] Member ifrs-full:ClassesOfAssetsMember
3435 Equity (equity derivatives, structured notes) [member] Member ing:EquityDerivativesStructuredNotesMember
3436 Interest rates (Rates derivatives, FX derivatives) [member] Member ing:InterestRatesDerivativesForeignExchangeDerivativesMember
3437 Credit (Debt securities, Loans, structured notes, credit derivatives) [member] Member ing:CreditDebtSecuritiesLoansStructuredNotesCreditDerivativesMember
3438 Debt securities [member] Member ifrs-full:DebtSecuritiesMember
3439 Loans And Advances [Member] Member ing:LoansAndAdvancesMember
3440 Disclosure of fair value measurement of assets [line items] LineItems ifrs-full:DisclosureOfFairValueMeasurementOfAssetsLineItems
3441 Positive fair value movements from using reasonable possible alternatives Concept (Monetary) For Period Debit ing:PositiveFairValueMovementsUsingPossibleAlternatives
3442 Negative fair value movements from using reasonable possible alternatives Concept (Monetary) For Period Debit ing:NegativeFairValueMovementsUsingPossibleAlternatives
3443 043708 - Disclosure - Fair Value of Assets and Liabilities - Methods applied in determining fair values of financial assets and liabilities (carried at amortised cost) (Detail) Network

*

*

 http://www.ing.com/role/FairValueOfAssetsAndLiabilitiesMethodsAppliedInDeterminingFairValuesOfFinancialAssetsAndLiabilitiescarriedAtAmortisedCostDetail
3444 Disclosure Of Fair Value Financial Assets And Liabilities [Table] Table

*

*

 ing:DisclosureOfFairValueFinancialAssetsAndLiabilitiesTable
3445 Levels of fair value hierarchy [axis] Axis ifrs-full:LevelsOfFairValueHierarchyAxis
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3447 Level 1 [member] Member ifrs-full:Level1OfFairValueHierarchyMember
3448 Level 2 [member] Member ifrs-full:Level2OfFairValueHierarchyMember
3449 Level 3 [member] Member ifrs-full:Level3OfFairValueHierarchyMember
3450 Classes of financial liabilities [axis] Axis ifrs-full:ClassesOfFinancialLiabilitiesAxis
3451 Financial liabilities, class [member] Member ifrs-full:FinancialLiabilitiesMember
3452 Financial liabilities [member] Member ifrs-full:FinancialLiabilitiesAtAmortisedCostMember
3453 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
3454 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
3455 Financial assets [member] Member ifrs-full:FinancialAssetsAtAmortisedCostMember
3456 Debt securities [member] Member ifrs-full:DebtSecuritiesMember
3457 Disclosure Of Fair Value Financial Assets And Liabilities [Line Items] LineItems ing:DisclosureOfFairValueFinancialAssetsAndLiabilitiesLineItems
3458 Financial Assets Abstract ifrs-full:DisclosureOfFinancialAssetsAbstract
3459 Loans and advances to banks Concept (Monetary) As Of Debit ifrs-full:LoansAndAdvancesToBanks
3460 Held-to-maturity investments Concept (Monetary) As Of Debit ifrs-full:HeldtomaturityInvestments
3461 Loans and advances to customers1 Concept (Monetary) As Of Debit ifrs-full:LoansAndAdvancesToCustomers
3462 Securities at amortised cost Concept (Monetary) As Of Debit ing:SecuritiesAtAmortisedCost
3463 Total Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
3464 Financial liabilities Abstract ifrs-full:DisclosureOfFinancialLiabilitiesAbstract
3465 Deposits from banks1 Concept (Monetary) As Of Credit ifrs-full:DepositsFromBanks
3466 Customer deposits1 Concept (Monetary) As Of Credit ifrs-full:DepositsFromCustomers
3467 Debt securities in issue Concept (Monetary) As Of Credit ifrs-full:DebtSecurities
3468 Subordinated loans Concept (Monetary) As Of Credit ifrs-full:SubordinatedLiabilities
3469 Total Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilities
3470 043710 - Disclosure - Fair Value of Assets and Liabilities - Additional Information (Detail) Network

*

*

 http://www.ing.com/role/FairValueOfAssetsAndLiabilitiesAdditionalInformationDetail
3471 Disclosure of Fair Value Measurement of Assets and Liabilities [Table] Table

*

*

 ing:DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable
3472 Levels of fair value hierarchy [axis] Axis ifrs-full:LevelsOfFairValueHierarchyAxis
3473 All levels of fair value hierarchy [member] Member ifrs-full:AllLevelsOfFairValueHierarchyMember
3474 Level 3 [member] Member ifrs-full:Level3OfFairValueHierarchyMember
3475 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
3476 Assets [member] Member ifrs-full:ClassesOfAssetsMember
3477 Property in own use [member] Member ing:PropertyMember
3478 Investment property [member] Member ifrs-full:InvestmentPropertyMember
3479 Legal Entity [Axis] Axis dei:LegalEntityAxis
3480 Entity [Domain] Member dei:EntityDomain
3481 Visa europe limited [member] Member ing:VISAEuropeLimitedMember
3482 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
3483 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
3484 Financial assets at fair value Member ifrs-full:FinancialAssetsAtFairValueMember
3485 Classes of liabilities [axis] Axis ifrs-full:ClassesOfLiabilitiesAxis
3486 Liabilities [member] Member ifrs-full:LiabilitiesMember
3487 Financial liabilities, class [member] Member ifrs-full:FinancialLiabilitiesMember
3488 Disclosure of fair value measurement of assets and liabilities [Line Items] LineItems ing:DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems
3489 Description of valuation methods Concept (Text/String) For Period ifrs-full:DescriptionOfValuationTechniquesUsedInFairValueMeasurementAssets
3490 Description of valuation adjustments techniques Concept (Text/String) For Period ing:DescriptionOfValuationAdjustmentsTechniquesUsedInFairValueMeasurementAssets
3491 Confidence range Concept (Text/String) For Period ing:FairValueObservableConfidenceDescription
3492 Significant confidence range percentage Concept (Percent) For Period ing:SignificantConfidenceRangePercentage
3493 Revaluation reserves on shares Concept (Monetary) For Period Debit ing:ReleaseOfRevaluationReservesInSharesValue
3494 Reclassification, financial assets Concept (Monetary) As Of Debit ifrs-full:IncreaseDecreaseInFinancialAssetsOnBasisOfMeasurementCategoryFirstApplicationOfIFRS9
3495 Unrealised gains on (losses) recognised in the statement of profit or loss Concept (Monetary) For Period Credit ifrs-full:GainsLossesRecognisedInProfitOrLossAttributableToChangeInUnrealisedGainsOrLossesForAssetsHeldAtEndOfPeriodFairValueMeasurement
3496 Financial assets, at fair value Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValue
3497 Financial assets measured at fair value Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossMandatorilyMeasuredAtFairValue
3498 Financial assets classified as Level 3 Concept (Monetary) For Period Debit ing:FinancialAssetsClassifiedAsLevelThree
3499 Percentage of financial assets classified as level 3 Concept (Percent) For Period ing:PercentageOfFinancialAssetsClassifiedAsLevel3
3500 Financial liabilities measured at fair value Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLoss
3501 Financial liabilities classified as Level 3 Concept (Monetary) For Period Credit ing:FinancialLiabilitiesClassifiedAsLevelThree
3502 Percentage of financial liabilities classified as level 3 Concept (Percent) For Period ing:PercentageOfFinancialLiabilitiesClassifiedAsLevel3
3503 Financial assets classified as Level 3 based on quoted price Concept (Monetary) As Of Debit ing:FinancialAssetsClassifiedAsLevel3BasedOnQuotedPrice
3504 Percentage on financial asset based on unadjusted quoted price Concept (Percent) For Period ing:PercentageOnFinancialAssetsBasedOnUnadjustedQuotedPricesInInactiveMarkets
3505 Amount of risk neutral designed financial assets Concept (Monetary) As Of Debit ing:AmountOfRiskNeutralDesignedFinancialAssets
3506 Remaining financial assets classified as level 3 using valuation techniques Concept (Monetary) As Of Debit ing:RemainingFinancialAssetsClassifiedAsLevel3
3507 Financial Liabilities classified as Level 3 based on unadjusted quoted price Concept (Monetary) As Of Credit ing:FinancialLiabilitiesClassifiedAsLevelBasedOnUnadjustedQuotedPriceInactiveMarkets
3508 Percentage on financial liabilities based on unadjusted quoted price Concept (Percent) For Period ing:PercentageOfFinancialLiabilitiesClassifiedAsLevel3BasedOnUnadjustedQuotedPrices
3509 Financial Liabilities designed to be fully neutral in terms of market risk Concept (Monetary) As Of Credit ing:AmountOfFinancialLiabilitiesDesignedToBeFullyNeutral
3510 Remaining financial liabilities classified as level 3 using valuation techniques Concept (Monetary) As Of Credit ing:RemainingFinancialLiabilitiesClassifiedAsLevel3ThatIncorporatesCertainInputsThatAreUnobservable
3511 Comparative price percentage for securities without quoted prices and without expected price recovery Concept (Percent) For Period ing:ComparativePricePercentageForSecuritiesWithoutQuotedPricesAndWithoutExpectedPriceRecovery
3512 Comparative price percentage for securities without quoted prices and with expected price recovery Concept (Percent) For Period ing:ComparativePricePercentageForSecuritiesWithoutQuotedPricesAndWithExpectedPriceRecovery
3513 Minimum level of volatility Concept (Percent) For Period ing:MinimumLevelVolatilityForSharesSignificantUnobservableInputsEntityOwnEquityInstruments
3514 Description of interest rate Concept (Text/String) For Period ing:DescriptionOfInterestRateInToLevel3OfFairValueHierarchyEntitysOwnEquityInstruments
3515 Loans and advances interest expenses Concept (Monetary) For Period Debit ing:LoansAndAdvancesInterestExpenses
3516 Property and equipment Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
3517 Non-financial liabilities Concept (Monetary) As Of Credit ing:NonFinancialLiabilitiesAtFairValue
3518 Mortgage prepayment rate Concept (Percent) For Period ing:MortgagePrepaymentRate
3519 Percentage of valuation certainty Concept (Percent) For Period ing:PercentageOfValuationCertainty
3520 Accrued interest expense financial assets and liabilties Concept (Monetary) For Period Debit ing:AccruedInterestExpenseFinancialAssetsAndLiabilties
3521 043801 - Disclosure - Derivatives and Hedge Accounting - Gross carrying value of derivatives designated under fair value hedge accounting (Detail) Network

*

*

 http://www.ing.com/role/DerivativesAndHedgeAccountingGrossCarryingValueOfDerivativesDesignatedUnderFairValueHedgeAccountingDetail
3522 Disclosure of detailed information about hedging instruments [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutHedgingInstrumentsTable
3523 Hedging instruments [axis] Axis ifrs-full:HedgingInstrumentsAxis
3524 Hedging instruments [member] Member ifrs-full:HedgingInstrumentsMember
3525 Derivatives [member] Member ifrs-full:DerivativesMember
3526 Types of hedges [axis] Axis ifrs-full:TypesOfHedgesAxis
3527 Hedges [member] Member ifrs-full:TypesOfHedgesMember
3528 Fair value hedges [member] Member ifrs-full:FairValueHedgesMember
3529 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
3530 Risks [member] Member ifrs-full:TypesOfRisksMember
3531 Interest rate risk [member] Member ifrs-full:InterestRateRiskMember
3532 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
3533 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
3534 Interest rate swaps [member] Member ifrs-full:InterestRateSwapContractMember
3535 Other interest rate derivatives [member] Member ing:OtherInterestRateDerivativesMember
3536 Disclosure of detailed information about hedging instruments [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems
3537 Hedging instrument, assets Concept (Monetary) As Of Debit ifrs-full:HedgingInstrumentAssets
3538 Hedging instrument, liabilities Concept (Monetary) As Of Credit ifrs-full:HedgingInstrumentLiabilities
3539 043805 - Disclosure - Derivatives and Hedge Accounting - Maturity derivatives designated in fair value hedging (Detail) Network

*

*

 http://www.ing.com/role/DerivativesAndHedgeAccountingMaturityDerivativesDesignatedInFairValueHedgingDetail
3540 Disclosure of detailed information about hedging instruments [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutHedgingInstrumentsTable
3541 Hedging instruments [axis] Axis ifrs-full:HedgingInstrumentsAxis
3542 Hedging instruments [member] Member ifrs-full:HedgingInstrumentsMember
3543 Derivatives [member] Member ifrs-full:DerivativesMember
3544 Types of hedges [axis] Axis ifrs-full:TypesOfHedgesAxis
3545 Hedges [member] Member ifrs-full:TypesOfHedgesMember
3546 Fair value hedges [member] Member ifrs-full:FairValueHedgesMember
3547 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
3548 Risks [member] Member ifrs-full:TypesOfRisksMember
3549 Interest rate risk [member] Member ifrs-full:InterestRateRiskMember
3550 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
3551 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
3552 Interest rate swaps [member] Member ifrs-full:InterestRateSwapContractMember
3553 Other interest rate derivatives [member] Member ing:OtherInterestRateDerivativesMember
3554 Maturity [axis] Axis ifrs-full:MaturityAxis
3555 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
3556 Less than 1 month [member] Member ifrs-full:NotLaterThanOneMonthMember
3557 1-3 months [member] Member ifrs-full:LaterThanOneMonthAndNotLaterThanThreeMonthsMember
3558 3-12 months [member] Member ifrs-full:LaterThanThreeMonthsAndNotLaterThanOneYearMember
3559 More than 1 year but less than 2 years [member] Member ifrs-full:LaterThanOneYearAndNotLaterThanTwoYearsMember
3560 More than 2 years but less than 3 years [member] Member ifrs-full:LaterThanTwoYearsAndNotLaterThanThreeYearsMember
3561 More than 3 years but less than 4 years [member] Member ifrs-full:LaterThanThreeYearsAndNotLaterThanFourYearsMember
3562 4 to 5 years [member] Member ifrs-full:LaterThanFourYearsAndNotLaterThanFiveYearsMember
3563 Over 5 Years [member] Member ifrs-full:LaterThanFiveYearsMember
3564 Disclosure of detailed information about hedging instruments [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems
3565 Nominal amount Concept (Decimal) As Of ifrs-full:NominalAmountOfHedgingInstrument
3566 043808 - Disclosure - Derivatives and Hedge Accounting - Hedged items included in a fair value hedging relationship (Detail) Network

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*

 http://www.ing.com/role/DerivativesAndHedgeAccountingHedgedItemsIncludedInAFairValueHedgingRelationshipDetail
3567 Disclosure of detailed information about hedged items [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutHedgedItemsTable
3568 Hedged items [axis] Axis ifrs-full:HedgedItemsAxis
3569 Hedged items [member] Member ifrs-full:HedgedItemsMember
3570 -Amounts due from banks [member] Member ing:AmountsDueFromBanksMember
3571 -Debt securities [member] Member ifrs-full:DebtSecuritiesMember
3572 -Loans and advances to customers [member] Member ing:LoansAndAdvancesToCustomersMember
3573 -Customer deposits and other funds on deposit [Member] Member ing:CustomerDepositsAndOtherFundsOnDepositMember
3574 -Amounts Due to Banks [Member] Member ing:AmountsDueToBanksMember
3575 -Subordinated loans [member] Member ing:SubordinatedLoansMember
3576 Categories of financial assets [axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
3577 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
3578 Financial assets at fair value through other comprehensive income, category [member] Member ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember
3579 Financial assets at amortised cost, category [member] Member ifrs-full:FinancialAssetsAtAmortisedCostCategoryMember
3580 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
3581 Risks [member] Member ifrs-full:TypesOfRisksMember
3582 Interest rate risk [member] Member ifrs-full:InterestRateRiskMember
3583 Types of hedges [axis] Axis ifrs-full:TypesOfHedgesAxis
3584 Hedges [member] Member ifrs-full:TypesOfHedgesMember
3585 Fair value hedges [member] Member ifrs-full:FairValueHedgesMember
3586 Hedging instruments [axis] Axis ifrs-full:HedgingInstrumentsAxis
3587 Hedging instruments [member] Member ifrs-full:HedgingInstrumentsMember
3588 Derivatives [member] Member ifrs-full:DerivativesMember
3589 Disclosure of detailed information about hedged items [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutHedgedItemsLineItems
3590 Assets [abstract] Abstract ifrs-full:AssetsAbstract
3591 Carrying amount of the hedge item, Assets Concept (Monetary) As Of Debit ifrs-full:HedgedItemAssets
3592 Accumulated amount of fair value hedge adjustment on the hedged item included in the carrying amount of the hedged item, Assets Concept (Monetary) As Of Debit ifrs-full:AccumulatedFairValueHedgeAdjustmentOnHedgedItemIncludedInCarryingAmountAssets
3593 Discontinued hedges, Assets Concept (Monetary) As Of Debit ifrs-full:AccumulatedFairValueHedgeAdjustmentRemainingInStatementOfFinancialPositionForHedgedItemThatCeasedToBeAdjustedForHedgingGainsAndLossesAssets
3594 Liabilities [abstract] Abstract ifrs-full:LiabilitiesAbstract
3595 Carrying amount of the hedge item, Liabilities Concept (Monetary) As Of Credit ifrs-full:HedgedItemLiabilities
3596 Accumulated amount of fair value hedge adjustment on the hedged item included in the carrying amount of the hedged item, Liabilities Concept (Monetary) As Of Credit ifrs-full:AccumulatedFairValueHedgeAdjustmentOnHedgedItemIncludedInCarryingAmountLiabilities
3597 -Discontinued hedges, Liabilities Concept (Monetary) As Of Credit ifrs-full:AccumulatedFairValueHedgeAdjustmentRemainingInStatementOfFinancialPositionForHedgedItemThatCeasedToBeAdjustedForHedgingGainsAndLossesLiabilities
3598 Change in fair value used as a basis to determine hedge ineffectiveness for the period Concept (Monetary) For Period Credit ifrs-full:GainLossOnChangeInFairValueOfHedgedItemUsedAsBasisForRecognisingHedgeIneffectiveness
3599 Change in fair value of derivatives Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnChangeInFairValueOfDerivatives
3600 Hedge ineffectiveness recognised in the statement of profit or Lloss Concept (Monetary) For Period Credit ifrs-full:GainLossOnHedgeIneffectivenessRecognisedInProfitOrLoss
3601 043810 - Disclosure - Derivatives and Hedge Accounting - Gross carrying value of derivatives used for cash flow hedge accounting (Detail) Network

*

*

 http://www.ing.com/role/DerivativesAndHedgeAccountingGrossCarryingValueOfDerivativesUsedForCashFlowHedgeAccountingDetail
3602 Disclosure of detailed information about hedging instruments [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutHedgingInstrumentsTable
3603 Hedging instruments [axis] Axis ifrs-full:HedgingInstrumentsAxis
3604 Hedging instruments [member] Member ifrs-full:HedgingInstrumentsMember
3605 Derivatives [member] Member ifrs-full:DerivativesMember
3606 Types of hedges [axis] Axis ifrs-full:TypesOfHedgesAxis
3607 Hedges [member] Member ifrs-full:TypesOfHedgesMember
3608 Cash flow hedges [member] Member ifrs-full:CashFlowHedgesMember
3609 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
3610 Risks [member] Member ifrs-full:TypesOfRisksMember
3611 Combined interest and FX rate risk [member] Member ifrs-full:MarketRiskMember
3612 Interest rate risk [member] Member ifrs-full:InterestRateRiskMember
3613 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
3614 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
3615 Interest rate swaps [member] Member ifrs-full:InterestRateSwapContractMember
3616 Cross currency swap [member] Member ifrs-full:CurrencySwapContractMember
3617 Disclosure of detailed information about hedging instruments [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems
3618 Hedging instrument, assets Concept (Monetary) As Of Debit ifrs-full:HedgingInstrumentAssets
3619 Hedging instrument, liabilities Concept (Monetary) As Of Credit ifrs-full:HedgingInstrumentLiabilities
3620 043812 - Disclosure - Derivatives and Hedge Accounting - Maturity derivatives designated in cash flow hedging (Detail) Network

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*

 http://www.ing.com/role/DerivativesAndHedgeAccountingMaturityDerivativesDesignatedInCashFlowHedgingDetail
3621 Disclosure of detailed information about hedging instruments [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutHedgingInstrumentsTable
3622 Hedging instruments [axis] Axis ifrs-full:HedgingInstrumentsAxis
3623 Hedging instruments [member] Member ifrs-full:HedgingInstrumentsMember
3624 Derivatives [member] Member ifrs-full:DerivativesMember
3625 Types of hedges [axis] Axis ifrs-full:TypesOfHedgesAxis
3626 Hedges [member] Member ifrs-full:TypesOfHedgesMember
3627 Cash flow hedges [member] Member ifrs-full:CashFlowHedgesMember
3628 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
3629 Risks [member] Member ifrs-full:TypesOfRisksMember
3630 Combined interest and FX rate risk [member] Member ifrs-full:MarketRiskMember
3631 Interest rate risk [member] Member ifrs-full:InterestRateRiskMember
3632 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
3633 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
3634 Interest rate swaps [member] Member ifrs-full:InterestRateSwapContractMember
3635 Cross currency swap [member] Member ifrs-full:CurrencySwapContractMember
3636 Maturity [axis] Axis ifrs-full:MaturityAxis
3637 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
3638 Less than 1 month [member] Member ifrs-full:NotLaterThanOneMonthMember
3639 1-3 months [member] Member ifrs-full:LaterThanOneMonthAndNotLaterThanThreeMonthsMember
3640 3-12 months [member] Member ifrs-full:LaterThanThreeMonthsAndNotLaterThanOneYearMember
3641 More than 1 year but less than 2 years [member] Member ifrs-full:LaterThanOneYearAndNotLaterThanTwoYearsMember
3642 More than 2 years but less than 3 years [member] Member ifrs-full:LaterThanTwoYearsAndNotLaterThanThreeYearsMember
3643 More than 3 years but less than 4 years [member] Member ifrs-full:LaterThanThreeYearsAndNotLaterThanFourYearsMember
3644 4 to 5 years [member] Member ifrs-full:LaterThanFourYearsAndNotLaterThanFiveYearsMember
3645 Over 5 Years [member] Member ifrs-full:LaterThanFiveYearsMember
3646 Disclosure of detailed information about hedging instruments [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems
3647 Nominal amount Concept (Decimal) As Of ifrs-full:NominalAmountOfHedgingInstrument
3648 043813 - Disclosure - Derivatives and Hedge Accounting - Cash flow hedging - Impact of hedging instruments on the statement of profit or loss and other comprehensive income (Detail) Network

*

*

 http://www.ing.com/role/DerivativesAndHedgeAccountingCashFlowHedgingImpactOfHedgingInstrumentsOnTheStatementOfProfitOrLossAndOtherComprehensiveIncomeDetail
3649 Disclosure of detailed information about hedged items [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutHedgedItemsTable
3650 Hedging instruments [axis] Axis ifrs-full:HedgingInstrumentsAxis
3651 Hedging instruments [member] Member ifrs-full:HedgingInstrumentsMember
3652 Derivatives [member] Member ifrs-full:DerivativesMember
3653 Lending [Member] Member ing:LendingMember
3654 Borrowing [member] Member ifrs-full:BorrowingsByNameMember
3655 Other hedging instruments [member] Member ing:OtherHedgingInstrumentsMember
3656 Types of hedges [axis] Axis ifrs-full:TypesOfHedgesAxis
3657 Hedges [member] Member ifrs-full:TypesOfHedgesMember
3658 Cash flow hedges [member] Member ifrs-full:CashFlowHedgesMember
3659 Discontinued hedges [member] Member ing:DiscontinuedHedgesMember
3660 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
3661 Risks [member] Member ifrs-full:TypesOfRisksMember
3662 Combined interest and FX rate risk [member] Member ifrs-full:MarketRiskMember
3663 Interest rate risk [member] Member ifrs-full:InterestRateRiskMember
3664 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
3665 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
3666 Interest rate swaps [member] Member ifrs-full:InterestRateSwapContractMember
3667 Cross currency swap [member] Member ifrs-full:CurrencySwapContractMember
3668 Types of interest rates [axis] Axis ifrs-full:TypesOfInterestRatesAxis
3669 Interest rate types [member] Member ifrs-full:InterestRateTypesMember
3670 Floating interest rate [member] Member ifrs-full:FloatingInterestRateMember
3671 Disclosure of detailed information about hedging instruments [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems
3672 Change in fair value used as a basis to determine hedge ineffectiveness for the period Concept (Monetary) For Period Credit ifrs-full:GainLossOnChangeInFairValueOfHedgingInstrumentUsedAsBasisForRecognisingHedgeIneffectiveness
3673 Carrying amount cash flow hedge reserve at the end of the reporting period Concept (Monetary) As Of Credit ifrs-full:ReserveOfCashFlowHedgesContinuingHedges
3674 Amount reclassified from CFH reserve to profit or loss Concept (Monetary) For Period Debit ifrs-full:ReclassificationAdjustmentsOnCashFlowHedgesBeforeTax
3675 Cash flow is no longer expected to occur Concept (Monetary) As Of Credit ifrs-full:ReserveOfCashFlowHedgesHedgingRelationshipsForWhichHedgeAccountingIsNoLongerApplied
3676 Gains (losses) on change in fair value of derivatives Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnChangeInFairValueOfDerivatives
3677 Hedge ineffectiveness recognised in the statement of profit or Lloss Concept (Monetary) For Period Credit ifrs-full:GainLossOnHedgeIneffectivenessRecognisedInProfitOrLoss
3678 043815 - Disclosure - Derivatives and Hedge Accounting - Gross carrying value of derivatives used for net investment hedging (Detail) Network

*

*

 http://www.ing.com/role/DerivativesAndHedgeAccountingGrossCarryingValueOfDerivativesUsedForNetInvestmentHedgingDetail
3679 Disclosure of detailed information about hedging instruments [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutHedgingInstrumentsTable
3680 Hedging instruments [axis] Axis ifrs-full:HedgingInstrumentsAxis
3681 Hedging instruments [member] Member ifrs-full:HedgingInstrumentsMember
3682 Derivatives [member] Member ifrs-full:DerivativesMember
3683 Types of hedges [axis] Axis ifrs-full:TypesOfHedgesAxis
3684 Hedges [member] Member ifrs-full:TypesOfHedgesMember
3685 Hedges of net investments in foreign operations [member] Member ifrs-full:HedgesOfNetInvestmentInForeignOperationsMember
3686 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
3687 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
3688 Forwards and futures [member] Member ing:ForwardsAndFuturesMember
3689 Disclosure of detailed information about hedging instruments [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems
3690 Hedging instrument, assets Concept (Monetary) As Of Debit ifrs-full:HedgingInstrumentAssets
3691 Hedging instrument, liabilities Concept (Monetary) As Of Credit ifrs-full:HedgingInstrumentLiabilities
3692 043816 - Disclosure - Derivatives and Hedge Accounting - Maturity derivatives designated in net investment hedging (Detail) Network

*

*

 http://www.ing.com/role/DerivativesAndHedgeAccountingMaturityDerivativesDesignatedInNetInvestmentHedgingDetail
3693 Disclosure of detailed information about hedges [table] Table

*

*

 ifrs-full:DisclosureOfHedgeAccountingTable
3694 Types of hedges [axis] Axis ifrs-full:TypesOfHedgesAxis
3695 Hedges [member] Member ifrs-full:TypesOfHedgesMember
3696 Hedges of net investments in foreign operations [member] Member ifrs-full:HedgesOfNetInvestmentInForeignOperationsMember
3697 Hedging instruments [axis] Axis ifrs-full:HedgingInstrumentsAxis
3698 Hedging instruments [member] Member ifrs-full:HedgingInstrumentsMember
3699 Derivatives [member] Member ifrs-full:DerivativesMember
3700 Maturity [axis] Axis ifrs-full:MaturityAxis
3701 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
3702 Less than 1 month [member] Member ifrs-full:NotLaterThanOneMonthMember
3703 1-3 months [member] Member ifrs-full:LaterThanOneMonthAndNotLaterThanThreeMonthsMember
3704 3-12 months [member] Member ifrs-full:LaterThanThreeMonthsAndNotLaterThanOneYearMember
3705 More than 1 year but less than 2 years [member] Member ifrs-full:LaterThanOneYearAndNotLaterThanTwoYearsMember
3706 More than 2 years but less than 3 years [member] Member ifrs-full:LaterThanTwoYearsAndNotLaterThanThreeYearsMember
3707 More than 3 years but less than 4 years [member] Member ifrs-full:LaterThanThreeYearsAndNotLaterThanFourYearsMember
3708 4 to 5 years [member] Member ifrs-full:LaterThanFourYearsAndNotLaterThanFiveYearsMember
3709 Over 5 Years [member] Member ifrs-full:LaterThanFiveYearsMember
3710 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
3711 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
3712 Forwards and futures [member] Member ing:ForwardsAndFuturesMember
3713 Disclosure of detailed information about hedging instruments [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems
3714 Nominal amount Concept (Decimal) As Of ifrs-full:NominalAmountOfHedgingInstrument
3715 043817 - Disclosure - Derivatives and Hedge Accounting - Net investment hedge accounting - Impact on statement of profit or loss and other comprehensive income (Detail) Network

*

*

 http://www.ing.com/role/DerivativesAndHedgeAccountingNetInvestmentHedgeAccountingImpactOnStatementOfProfitOrLossAndOtherComprehensiveIncomeDetail
3716 Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [table] Table

*

*

 ifrs-full:DisclosureOfInformationAboutAmountsThatAffectedStatementOfComprehensiveIncomeAsResultOfHedgeAccountingTable
3717 Types of hedges [axis] Axis ifrs-full:TypesOfHedgesAxis
3718 Hedges [member] Member ifrs-full:TypesOfHedgesMember
3719 Hedges of net investment in foreign operations [member] Member ifrs-full:HedgesOfNetInvestmentInForeignOperationsMember
3720 Discontinued hedges [member] Member ing:DiscontinuedHedgesMember
3721 Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items] LineItems ifrs-full:DisclosureOfInformationAboutAmountsThatAffectedStatementOfComprehensiveIncomeAsResultOfHedgeAccountingLineItems
3722 Carrying amount net investment hedge reserve at the end of the reporting period Concept (Monetary) As Of Credit ifrs-full:ReserveOfExchangeDifferencesOnTranslationContinuingHedges
3723 Carrying amount net investment hedge reserve at the end of the reporting period, Discontinued hedges Concept (Monetary) As Of Credit ifrs-full:ReserveOfExchangeDifferencesOnTranslationHedgingRelationshipsForWhichHedgeAccountingIsNoLongerApplied
3724 Hedged item affected statement of profit or loss Concept (Monetary) For Period Debit ifrs-full:ReclassificationAdjustmentsOnHedgesOfNetInvestmentsInForeignOperationsNetOfTax
3725 Change in value of hedging instrument recognised in OCI Concept (Monetary) For Period Credit ifrs-full:GainLossOnHedgeIneffectivenessRecognisedInOtherComprehensiveIncome
3726 Hedge ineffectiveness recognised in the statement of profit or Lloss Concept (Monetary) For Period Credit ifrs-full:GainLossOnHedgeIneffectivenessRecognisedInProfitOrLoss
3727 043825 - Disclosure - Derivatives and Hedge Accounting (Narrative) (Detail) Network

*

*

 http://www.ing.com/role/DerivativesAndHedgeAccountingNarrativeDetail
3728 Disclosure of risk management strategy related to hedge accounting [table] Table

*

*

 ifrs-full:DisclosureOfRiskManagementStrategyRelatedToHedgeAccountingTable
3729 Types of hedges [axis] Axis ifrs-full:TypesOfHedgesAxis
3730 Hedges [member] Member ifrs-full:TypesOfHedgesMember
3731 Fair value hedges [member] Member ifrs-full:FairValueHedgesMember
3732 Cash flow hedges [member] Member ifrs-full:CashFlowHedgesMember
3733 Hedges of net investments in foreign operations [member] Member ifrs-full:HedgesOfNetInvestmentInForeignOperationsMember
3734 Categories of financial assets [axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
3735 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
3736 Financial assets at fair value through profit or loss, category [member] Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember
3737 Categories of financial liabilities [axis] Axis ifrs-full:CategoriesOfFinancialLiabilitiesAxis
3738 Financial liabilities, category [member] Member ifrs-full:FinancialLiabilitiesCategoryMember
3739 Financial liabilities at fair value through profit or loss, category [member] Member ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember
3740 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
3741 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
3742 Interest rate swaps [member] Member ifrs-full:InterestRateSwapContractMember
3743 Currency swap contract [member] Member ifrs-full:CurrencySwapContractMember
3744 Currency [Axis] Axis srt:CurrencyAxis
3745 All Currencies [Domain] Member currency:AllCurrenciesDomain
3746 EUR Member currency:EUR
3747 USD Member currency:USD
3748 PLN Member currency:PLN
3749 AUD Member currency:AUD
3750 THB Member currency:THB
3751 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
3752 Risks [member] Member ifrs-full:TypesOfRisksMember
3753 Combined interest and FX rate risk [member] Member ifrs-full:MarketRiskMember
3754 Interest rate risk [member] Member ifrs-full:InterestRateRiskMember
3755 Disclosure of risk management strategy related to hedge accounting [line items] LineItems ifrs-full:DisclosureOfRiskManagementStrategyRelatedToHedgeAccountingLineItems
3756 Non-trading derivatives, Assets Concept (Monetary) As Of Debit ifrs-full:DerivativeFinancialAssetsHeldForHedging
3757 Non-trading derivatives, Liabilities Concept (Monetary) As Of Credit ifrs-full:DerivativeFinancialLiabilitiesHeldForHedging
3758 Average rates of hedging instrument Concept (Percent) As Of ifrs-full:AverageRateOfHedgingInstrument
3759 Average foreign exchange rate Concept (Decimal) For Period ifrs-full:AverageForeignExchangeRate
3760 043901 - Disclosure - Assets by Contractual Maturity - Summary of Assets By Contractual Maturity (Detail) Network

*

*

 http://www.ing.com/role/AssetsByContractualMaturitySummaryOfAssetsByContractualMaturityDetail
3761 Disclosure Of Assets By Contractual Maturity Schedule [Table] Table

*

*

 ifrs-full:DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskTable
3762 Maturity [axis] Axis ifrs-full:MaturityAxis
3763 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
3764 Less than 1 month [member] Member ifrs-full:NotLaterThanOneMonthMember
3765 1-3 months [member] Member ifrs-full:LaterThanOneMonthAndNotLaterThanThreeMonthsMember
3766 3-12 months [member] Member ifrs-full:LaterThanThreeMonthsAndNotLaterThanOneYearMember
3767 1-5 years [member] Member ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember
3768 Over 5 Years [member] Member ifrs-full:LaterThanFiveYearsMember
3769 Maturity not applicable [member] Member ing:MaturityNotApplicableMember
3770 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
3771 Assets [member] Member ifrs-full:ClassesOfAssetsMember
3772 Equity securities [member] Member ifrs-full:EquityInvestmentsMember
3773 Debt securities [member] Member ifrs-full:DebtSecuritiesMember
3774 Loans And Advances [Member] Member ing:LoansAndAdvancesMember
3775 Disclosure Of Assets By Contractual Maturity Schedule [Line Items] LineItems ifrs-full:DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskLineItems
3776 Cash and balances with central banks Concept (Monetary) As Of Debit ifrs-full:CashAndBankBalancesAtCentralBanks
3777 Loans and advances to banks Concept (Monetary) As Of Debit ifrs-full:LoansAndAdvancesToBanks
3778 Financial assets at fair value through profit or loss Abstract ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossAbstract
3779 - trading assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTrading
3780 Positive fair values outstanding (Non-trading derivative assets) Concept (Monetary) As Of Debit ing:FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForNonTradingDerivatives
3781 - designated as at fair value through profit or loss Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossDesignatedAsUponInitialRecognition
3782 - mandatorily at fair value through profit or loss Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossMandatorilyMeasuredAtFairValue
3783 Investments Abstract ing:InvestmentAbstract
3784 - available-for-sale Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAvailableforsale
3785 - held-to-maturity Concept (Monetary) As Of Debit ifrs-full:HeldtomaturityInvestments
3786 Financial assets at fair value through other comprehensive income Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncome
3787 Financial assets at amortised cost Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtAmortisedCost
3788 Loans and advances to customers Concept (Monetary) As Of Debit ifrs-full:LoansAndAdvancesToCustomers
3789 Intangible assets Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsOtherThanGoodwill
3790 Other assets Concept (Monetary) As Of Debit ing:OtherAssetsIncludingCurrentAndDeferredTaxAssets
3791 Remaining assets (for which maturities are not applicable) Concept (Monetary) As Of Debit ifrs-full:NoncurrentAssets
3792 Total assets Concept (Monetary) As Of Debit ifrs-full:Assets
3793 044001 - Disclosure - Liabilities by Maturity - Schedule of Maturity of Non-Financial Liabilities (Detail) Network

*

*

 http://www.ing.com/role/LiabilitiesByMaturityScheduleOfMaturityOfNonFinancialLiabilitiesDetail
3794 Disclosure Of Non Financial Liabilities By Maturity Schedule [table] Table

*

*

 ing:DisclosureOfNonFinancialLiabilitiesByMaturityScheduleTable
3795 Maturity [axis] Axis ifrs-full:MaturityAxis
3796 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
3797 Less than 1 month [member] Member ifrs-full:NotLaterThanOneMonthMember
3798 1-3 months [member] Member ifrs-full:LaterThanOneMonthAndNotLaterThanThreeMonthsMember
3799 3-12 months [member] Member ing:LaterThanThreeMonthsAndNotLaterThanTwelveMonthsMember
3800 1-5 years [member] Member ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember
3801 Over 5 Years [member] Member ifrs-full:LaterThanFiveYearsMember
3802 Maturity not applicable [member] Member ing:MaturityNotApplicableMember
3803 Adjustment [member] Member ing:AdjustmentMember
3804 Disclosure Of Liabilities By Maturity Schedule [Line Items] LineItems ing:DisclosureOfLiabilitiesByMaturityScheduleLineItems
3805 Deposits from banks Concept (Monetary) As Of Credit ifrs-full:DepositsFromBanks
3806 Customer deposits Concept (Monetary) As Of Credit ifrs-full:DepositsFromCustomers
3807 Financial liabilities at fair value through profit or loss Abstract ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossAbstract
3808 - other trading liabilities Concept (Monetary) As Of Credit ing:FinancialLiabilitiesAtFairValueThroughOtherTradingLiabilities
3809 - trading derivatives Concept (Monetary) As Of Credit ing:FinancialLiabilitiesAtFairValueThroughProfitOrLossThatMeetDefinitionOfHeldForTradingDerivatives
3810 - non-trading derivatives Concept (Monetary) As Of Credit ing:FinancialLiabilitiesAtFairValueThroughProfitOrLossClassifiedAsHeldForNonTradingDerivatives
3811 - designated at fair value through profit or loss Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedAsUponInitialRecognition
3812 Debt securities in issue Concept (Monetary) As Of Credit ifrs-full:DebtSecurities
3813 Subordinated loans Concept (Monetary) As Of Credit ifrs-full:SubordinatedLiabilities
3814 Financial liabilities Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesAtAmortisedCost
3815 Other liabilities Concept (Monetary) As Of Credit ing:OtherLiabilitiesIncludesCurrentAndDeferredTaxLiabilitiesAndProvisions
3816 Non-financial liabilities Concept (Monetary) As Of Credit ing:NonFinancialLiabilities
3817 Total liabilities Concept (Monetary) As Of Credit ifrs-full:Liabilities
3818 Coupon interest due on financial liabilities Concept (Monetary) As Of Credit ing:CouponInterestDueOnFinancialLiabilities
3819 044101 - Disclosure - Assets Not Freely Disposable - Summary of Assets Not Free Disposable (Detail) Network

*

*

 http://www.ing.com/role/AssetsNotFreelyDisposableSummaryOfAssetsNotFreeDisposableDetail
3820 Assets Not Freely Disposable [table] Table

*

*

 ing:AssetsNotFreelyDisposableTable
3821 Continuing and discontinued operations [axis] Axis ifrs-full:ContinuingAndDiscontinuedOperationsAxis
3822 Aggregate continuing and discontinued operations [member] Member ifrs-full:AggregateContinuingAndDiscontinuedOperationsMember
3823 Continuing operations [member] Member ifrs-full:ContinuingOperationsMember
3824 Types of financial assets [axis] Axis ifrs-full:TypesOfFinancialAssetsAxis
3825 Financial assets, type [member] Member ifrs-full:FinancialAssetsTypeMember
3826 Cash and balances with central banks [Member] Member ing:CashAndBalancesWithCentralBanksMember
3827 Loans And Advances To Banks [Member] Member ing:LoansAndAdvancesToBanksMember
3828 Financial Investments [Member] Member ing:FinancialInvestmentsMember
3829 Loans and advances to customers [Member] Member ing:LoansAndAdvancesToCustomersMember
3830 Other assets [member] Member ifrs-full:OtherAssetsMember
3831 Categories of financial assets [axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
3832 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
3833 Financial assets at fair value through profit or loss, category [member] Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember
3834 Financial assets at fair value through other comprehensive income, category [member] Member ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember
3835 Securities at amortised cost [Member] Member ing:SecuritiesAtAmortisedCostMember
3836 Assets Not Freely Disposable [line items] LineItems ing:AssetsNotFreelyDisposableLineItems
3837 Financial assets pledged Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsPledgedAsCollateralForLiabilitiesOrContingentLiabilities
3838 044102 - Disclosure - Assets Not Freely Disposable - Additional Information (Detail) Network

*

*

 http://www.ing.com/role/AssetsNotFreelyDisposableAdditionalInformationDetail
3839 Disclosure of offsetting of financial liabilities [table] Table

*

*

 ifrs-full:DisclosureOfOffsettingOfFinancialLiabilitiesTable
3840 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
3841 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
3842 Netherlands [member] Member country:NL
3843 Germany [member] Member country:DE
3844 Belgium [member] Member country:BE
3845 Australia [member] Member country:AU
3846 United States [member] Member country:US
3847 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
3848 Assets [member] Member ifrs-full:ClassesOfAssetsMember
3849 Debt securities [member] Member ifrs-full:DebtSecuritiesMember
3850 Types of financial liabilities [axis] Axis ifrs-full:TypesOfFinancialLiabilitiesAxis
3851 Financial liabilities, type [member] Member ifrs-full:FinancialLiabilitiesTypeMember
3852 Mandatory reserve deposits [Member] Member ing:MandatoryReserveDepositsMember
3853 Loans and advances to customers [Member] Member ing:LoansAndAdvancesToCustomersMember
3854 Disclosure of offsetting of financial liabilities [line items] LineItems ifrs-full:DisclosureOfOffsettingOfFinancialLiabilitiesLineItems
3855 Financial assets pledged Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsPledgedAsCollateralForLiabilitiesOrContingentLiabilities
3856 044201 - Disclosure - Transfer of Financial Assets - Schedule of Transfer of Financial Assets Not Qualifying for Derecognition (Detail) Network

*

*

 http://www.ing.com/role/TransferOfFinancialAssetsScheduleOfTransferOfFinancialAssetsNotQualifyingForDerecognitionDetail
3857 Disclosure of transferred financial assets that are not derecognised in their entirety [table] Table

*

*

 ifrs-full:DisclosureOfFinancialAssetsTransferredDuringPeriodWhichDoNotQualifyForDerecognitionTable
3858 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
3859 Assets [member] Member ifrs-full:ClassesOfAssetsMember
3860 Securities lending, equity [member] Member ing:EquitySecuritiesLendingMember
3861 Sale and repurchase, equity [member] Member ing:SaleAndRepurchaseOfEquitySecuritiesMember
3862 Sale and repurchase, debt [member] Member ing:SaleAndRepurchaseOfDebtSecuritiesMember
3863 Securities lending, debt [Member] Member ing:SecuritiesLendingDebtMember
3864 Categories of financial assets [axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
3865 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
3866 Financial assets at fair value through profit or loss [member] Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember
3867 Investments [member] Member ing:InvestmentMember
3868 Loans and advances to customers [member] Member ing:LoansAndAdvancesToCustomersMember
3869 Financial assets at fair value through other comprehensive income, category [member] Member ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember
3870 Securities at amortised cost [Member] Member ing:SecuritiesAtAmortisedCostMember
3871 Categories of financial liabilities [axis] Axis ifrs-full:CategoriesOfFinancialLiabilitiesAxis
3872 Financial liabilities, category [member] Member ifrs-full:FinancialLiabilitiesCategoryMember
3873 Financial liabilities at fair value through profit or loss [member] Member ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember
3874 Disclosure of transferred financial assets that are not derecognised in their entirety [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsTransferredDuringPeriodWhichDoNotQualifyForDerecognitionLineItems
3875 Financial assets at fair value through profit or loss Concept (Monetary) As Of Debit ifrs-full:FairValueOfTransferredFinancialAssetsThatAreNotDerecognisedInTheirEntirety
3876 Financial liabilities at fair value through profit or loss Concept (Monetary) As Of Credit ifrs-full:FairValueOfAssociatedFinancialLiabilities
3877 044301 - Disclosure - Offsetting Financial Assets and Liabilities - Summary of Financial Assets Subject to Offsetting, Enforceable Master Netting Arrangements and Similar Agreements (Detail) Network

*

*

 http://www.ing.com/role/OffsettingFinancialAssetsAndLiabilitiesSummaryOfFinancialAssetsSubjectToOffsettingEnforceableMasterNettingArrangementsAndSimilarAgreementsDetail
3878 Disclosure of offsetting of financial assets [table] Table

*

*

 ifrs-full:DisclosureOfOffsettingOfFinancialAssetsTable
3879 Categories of financial assets [axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
3880 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
3881 Loans and advances to banks [member] Member ing:LoansAndAdvancesToBanksMember
3882 Trading assets [member] Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTradingCategoryMember
3883 Financial assets at fair value through profit or loss, non-trading derivatives [member] Member ing:FinancialAssetsAtFairValueThroughProfitOrLossNontradingDerivativesMember
3884 Financial assets at fair value through other comprehensive income, category [member] Member ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember
3885 Loans and advances to customers [member] Member ing:LoansAndAdvancesToCustomersMember
3886 Other items where offsetting is applied in the statement of financial position [member] Member ing:OtherItemsWhereOffsettingIsAppliedInTheStatementOfFinancialPositionMember
3887 Impact of enforceable master netting arrangements or similar arrangements [member] Member ing:ImpactOfEnforceableMasterNettingArrangementsOrSimilarArrangementsMember
3888 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
3889 Financial instruments, class [member] Member ifrs-full:ClassesOfFinancialInstrumentsMember
3890 Reverse repurchase, securities borrowing and similar agreements [member] Member ing:ReverseRepurchaseSecuritiesBorrowingAndSimilarAgreementsMember
3891 Other [member] Member ing:OtherAssetsAsHeldForSaleMember
3892 Trading assets [member] Member ing:TradingAssetsMember
3893 Non-trading derivatives [member] Member ing:NonTradingDerivativesMember
3894 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
3895 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
3896 Derivatives [member] Member ifrs-full:DerivativesMember
3897 Disclosure of offsetting of financial assets [line items] LineItems ifrs-full:DisclosureOfOffsettingOfFinancialAssetsLineItems
3898 Gross amounts of recognised financial assets Concept (Monetary) As Of Debit ifrs-full:GrossFinancialAssetsSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreements
3899 Gross amounts of recognised financial liabilities offset in the statement of financial position Concept (Monetary) As Of Credit ifrs-full:GrossFinancialLiabilitiesSetOffAgainstFinancialAssetsSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreements
3900 Net amounts of financial assets presented in the statement of financial position Concept (Monetary) As Of Debit ifrs-full:NetFinancialAssetsSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreementsInStatementOfFinancialPosition
3901 Financial instruments Concept (Monetary) As Of Credit ifrs-full:FinancialInstrumentsSubjectToEnforceableMasterNettingArrangementOrSimilarAgreementNotSetOffAgainstFinancialAssets
3902 Cash and financial instruments received as collateral Concept (Monetary) As Of Credit ifrs-full:CashCollateralReceivedSubjectToEnforceableMasterNettingArrangementOrSimilarAgreementNotSetOffAgainstFinancialAssets
3903 Net amount Concept (Monetary) As Of Debit ifrs-full:NetFinancialAssetsSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreements
3904 044302 - Disclosure - Offsetting Financial Assets and Liabilities - Summary of Financial Liabilities Subject to Offsetting, Enforceable Master Netting Arrangements and Similar Agreements (Detail) Network

*

*

 http://www.ing.com/role/OffsettingFinancialAssetsAndLiabilitiesSummaryOfFinancialLiabilitiesSubjectToOffsettingEnforceableMasterNettingArrangementsAndSimilarAgreementsDetail
3905 Disclosure of offsetting of financial liabilities [table] Table

*

*

 ifrs-full:DisclosureOfOffsettingOfFinancialLiabilitiesTable
3906 Categories of financial liabilities [axis] Axis ifrs-full:CategoriesOfFinancialLiabilitiesAxis
3907 Financial liabilities, category [member] Member ifrs-full:FinancialLiabilitiesCategoryMember
3908 Deposits from banks [member] Member ing:DepositsFromBanksCategoryMember
3909 Customer deposits [member] Member ing:CustomerDepositsCategoryMember
3910 Financial liabilities at fair value through profit or loss [member] Member ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember
3911 Other items where offsetting is applied in the statement of financial position [member] Member ing:OtherItemsWhereOffsettingIsAppliedInTheStatementOfFinancialPositionMember
3912 Impact of enforceable master netting arrangements or similar arrangements [member] Member ing:ImpactOfEnforceableMasterNettingArrangementsOrSimilarArrangementsMember
3913 Classes of financial liabilities [axis] Axis ifrs-full:ClassesOfFinancialLiabilitiesAxis
3914 Financial liabilities, class [member] Member ifrs-full:FinancialLiabilitiesMember
3915 Trading liabilities [member] Member ing:TradingLiabilities1Member
3916 Non-trading derivatives liabilities [member] Member ing:NonTradingDerivativesLiabilitiesMember
3917 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
3918 Financial instruments, class [member] Member ifrs-full:ClassesOfFinancialInstrumentsMember
3919 Repurchase, securities lending and similar agreements [member] Member ing:RepurchaseSecuritiesLendingAndSimilarAgreementsMember
3920 Other [member] Member ing:OtherBanksDepositsMember
3921 Corporate deposits [member] Member ing:CorporateDepositsMember
3922 Other [member] Member ing:OtherCustomerDepositsMember
3923 Derivatives [member] Member ing:DerivativesLiabilitiesMember
3924 Disclosure of offsetting of financial liabilities [line items] LineItems ifrs-full:DisclosureOfOffsettingOfFinancialLiabilitiesLineItems
3925 Gross amounts of recognised financial liabilities Concept (Monetary) As Of Credit ifrs-full:GrossFinancialLiabilitiesSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreements
3926 Gross amounts of recognised financial assets offset in the statement of financial position Concept (Monetary) As Of Debit ifrs-full:GrossFinancialAssetsSetOffAgainstFinancialLiabilitiesSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreements
3927 Net amounts of financial liabilities presented in the statement of financial position Concept (Monetary) As Of Credit ifrs-full:NetFinancialLiabilitiesSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreementsInStatementOfFinancialPosition
3928 Financial instruments Concept (Monetary) As Of Debit ifrs-full:FinancialInstrumentsSubjectToEnforceableMasterNettingArrangementOrSimilarAgreementNotSetOffAgainstFinancialLiabilities
3929 Cash and financial instruments pledged as collateral Concept (Monetary) As Of Debit ifrs-full:CashCollateralPledgedSubjectToEnforceableMasterNettingArrangementOrSimilarAgreementNotSetOffAgainstFinancialLiabilities
3930 Net amount Concept (Monetary) As Of Credit ifrs-full:NetFinancialLiabilitiesSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreements
3931 044401 - Disclosure - Contingent Liabilities and Commitments - Summary of Contingent Liabilities and Commitments (Detail) Network

*

*

 http://www.ing.com/role/ContingentLiabilitiesAndCommitmentsSummaryOfContingentLiabilitiesAndCommitmentsDetail
3932 Disclosure of contingent liabilities [table] Table

*

*

 ifrs-full:DisclosureOfContingentLiabilitiesTable
3933 Maturity [axis] Axis ifrs-full:MaturityAxis
3934 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
3935 Less than 1 month [member] Member ifrs-full:NotLaterThanOneMonthMember
3936 1-3 months [member] Member ifrs-full:LaterThanOneMonthAndNotLaterThanThreeMonthsMember
3937 3-12 months [member] Member ifrs-full:LaterThanThreeMonthsAndNotLaterThanOneYearMember
3938 1-5 years [member] Member ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember
3939 Over 5 Years [member] Member ifrs-full:LaterThanFiveYearsMember
3940 Maturity not applicable [member] Member ing:MaturityNotApplicableMember
3941 Classes of contingent liabilities [axis] Axis ifrs-full:ClassesOfContingentLiabilitiesAxis
3942 Contingent liabilities [member] Member ifrs-full:ContingentLiabilitiesMember
3943 Contingent liabilities in respect of discounted bills [member] Member ing:ContingentLiabilityForDiscountedBillsMember
3944 Contingent liabilities in respect of guarantees [member] Member ifrs-full:ContingentLiabilityForGuaranteesMember
3945 Contingent liabilities in respect of irrevocable letters of credit [member] Member ing:ContingentLiabilityForIrrevocableLettersOfCreditMember
3946 Contingent liabilities in respect of other [member] Member ifrs-full:OtherContingentLiabilitiesMember
3947 Disclosure of contingent liabilities [line items] LineItems ifrs-full:DisclosureOfContingentLiabilitiesLineItems
3948 Contingent liabilities Concept (Monetary) As Of ifrs-full:EstimatedFinancialEffectOfContingentLiabilities
3949 Guarantees issued by ING Groep N.V. Concept (Monetary) As Of Credit ing:GuaranteesIssued
3950 Irrevocable facilities Concept (Monetary) As Of Credit ing:IrrevocableFacilities
3951 Contingent liabilities and commitments Concept (Monetary) As Of Credit ing:ContingentLiabilitiesAndCommitments
3952 044402 - Disclosure - Contingent Liabilities and Commitments - Summary of Future Rental Commitments to be Paid Under Non-cancellable Operating Leases (Detail) Network

*

*

 http://www.ing.com/role/ContingentLiabilitiesAndCommitmentsSummaryOfFutureRentalCommitmentsToBePaidUnderNoncancellableOperatingLeasesDetail
3953 Disclosure of finance lease and operating lease by lessee [table] Table

*

*

 ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeTable
3954 Maturity [axis] Axis ifrs-full:MaturityAxis
3955 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
3956 2019 [member] Member ifrs-full:NotLaterThanOneYearMember
3957 2019 [member] Member ifrs-full:LaterThanOneYearMember
3958 2020 [member] Member ifrs-full:LaterThanOneYearAndNotLaterThanTwoYearsMember
3959 2021 [member] Member ifrs-full:LaterThanTwoYearsAndNotLaterThanThreeYearsMember
3960 2022 [member] Member ifrs-full:LaterThanThreeYearsAndNotLaterThanFourYearsMember
3961 Years after 2022 [member] Member ing:LaterThanFourYearMember
3962 Disclosure of finance lease and operating lease by lessee [line items] LineItems ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeLineItems
3963 Future rental commitments for operating lease contracts Concept (Monetary) As Of Credit ifrs-full:MinimumLeasePaymentsPayableUnderNoncancellableOperatingLease
3964 044501 - Disclosure - Legal Proceedings - Additional Information (Detail) Network

*

*

 http://www.ing.com/role/LegalProceedingsAdditionalInformationDetail
3965 Disclosure Of Legal Proceedings [Table] Table

*

*

 ing:DisclosureOfLegalProceedingsTable
3966 Classes of other provisions [axis] Axis ifrs-full:ClassesOfProvisionsAxis
3967 Other provisions [member] Member ifrs-full:OtherProvisionsMember
3968 Criminal investigations, fine [Member] Member ing:CriminalInvestigationsFineMember
3969 Criminal investigations, disgorgement [Member] Member ing:CriminalInvestigationsDisgorgementMember
3970 VEB Fortis claim [Member] Member ing:VebFortisClaimMember
3971 Legal Entity [Axis] Axis dei:LegalEntityAxis
3972 Entity [Domain] Member dei:EntityDomain
3973 Ageas [member] Member ing:AgeasMember
3974 Classes of contingent liabilities [axis] Axis ifrs-full:ClassesOfContingentLiabilitiesAxis
3975 Contingent liabilities [member] Member ifrs-full:ContingentLiabilitiesMember
3976 Criminal proceedings regarding cash company financing [member] Member ifrs-full:LegalProceedingsContingentLiabilityMember
3977 Items of contingent liabilities [axis] Axis ifrs-full:ItemsOfContingentLiabilitiesAxis
3978 Items of contingent liabilities [member] Member ifrs-full:ItemsOfContingentLiabilitiesMember
3979 Penal fine [member] Member ing:PenalFineContingentLiabilityItemMember
3980 Fine, bankruptcy trustee, Cash Company [Member] Member ing:FineBankruptcyTrusteeCashCompanyMember
3981 Disclosure of Legal Proceedings [line items] LineItems ing:DisclosureOfLegalProceedingsLineItems
3982 Legal Proceedings Provision Concept (Monetary) As Of Credit ifrs-full:LegalProceedingsProvision
3983 Estimated financial effect of contingent liaiblity Concept (Monetary) As Of ifrs-full:EstimatedFinancialEffectOfContingentLiabilities
3984 Losses On Litigation Settlements Concept (Monetary) For Period Debit ifrs-full:LossesOnLitigationSettlements
3985 044601 - Disclosure - Consolidated Companies and Business Acquired and Divested - Consideration transferred (Details) Network

*

*

 http://www.ing.com/role/ConsolidatedCompaniesAndBusinessAcquiredAndDivestedConsiderationTransferredDetails
3986 Disclosure of detailed information about business combination [table] Table

*

*

 ifrs-full:DisclosureOfBusinessCombinationsTable
3987 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
3988 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
3989 Payvision Holding BV [Member] Member ing:PayvisionHoldingBvMember
3990 Disclosure of detailed information about business combination [line items] LineItems ifrs-full:DisclosureOfBusinessCombinationsLineItems
3991 Cash paid Concept (Monetary) As Of Credit ifrs-full:CashTransferred
3992 Deferred consideration Concept (Monetary) As Of Credit ing:DeferredConsiderationBusinessCombinationAcquisitionDate
3993 Contingent consideration Concept (Monetary) As Of Credit ifrs-full:LiabilitiesIncurred
3994 Total purchase consideration Concept (Monetary) As Of Credit ifrs-full:AcquisitiondateFairValueOfTotalConsiderationTransferred
3995 044602 - Disclosure - Consolidated Companies and Business Acquired and Divested - The assets and liabilities recognised as a result of the acquisition (Details) Network

*

*

 http://www.ing.com/role/ConsolidatedCompaniesAndBusinessAcquiredAndDivestedTheAssetsAndLiabilitiesRecognisedAsAResultOfTheAcquisitionDetails
3996 Disclosure of detailed information about business combination [table] Table

*

*

 ifrs-full:DisclosureOfBusinessCombinationsTable
3997 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
3998 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
3999 Payvision Holding BV [Member] Member ing:PayvisionHoldingBvMember
4000 Disclosure of detailed information about business combination [line items] LineItems ifrs-full:DisclosureOfBusinessCombinationsLineItems
4001 Cash and balances with central banks Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalentsRecognisedAsOfAcquisitionDate
4002 Loans and advances to banks Concept (Monetary) As Of Debit ing:LoansAndAdvancesRecognisedAsOfAcquisitionDate
4003 Financial assets at fair value through Other Comprehensive Income Concept (Monetary) As Of Debit ing:FinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeRecognisedAsOfAcquisitionDate
4004 Property and equipment Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate
4005 Intangible assets Concept (Monetary) As Of Debit ifrs-full:IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate
4006 Other Assets Concept (Monetary) As Of Debit ing:OtherAssetsRecognisedAsOfAcquisitionDate
4007 Total, Assets acquired as of acquisition date Concept (Monetary) As Of Debit ing:AssetsAcquiredAsOfAcquisitionDate
4008 Customer deposits Concept (Monetary) As Of Credit ing:CustomerDepositsRecognisedAsOfAcquisitionDate
4009 Current tax liability Concept (Monetary) As Of Credit ing:CurrentIncomeTaxLiabilitiesRecognisedAsOfAcquisitionDate
4010 Deferred tax liability Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilitiesRecognisedAsOfAcquisitionDate
4011 Other liabilities Concept (Monetary) As Of Credit ing:OtherLiabilitiesRecognisedAsOfAcquisitionDate
4012 Total, Liabilities acquired as of acqusition date Concept (Monetary) As Of Credit ing:LiabilitiesAcquiredAsOfAcqusitionDate
4013 Net identifiable assets Concept (Monetary) As Of Debit ing:IdentifiableAssetsAcquiredLiabilitiesAssumedBeforeNoncontrollingInterest
4014 Less: non-controlling interest Concept (Monetary) As Of Credit ifrs-full:NoncontrollingInterestInAcquireeRecognisedAtAcquisitionDate
4015 Net identifiable assets acquired Concept (Monetary) As Of Debit ifrs-full:IdentifiableAssetsAcquiredLiabilitiesAssumed
4016 044603 - Disclosure - Consolidated Companies and Business Acquired and Divested - Goodwill recognised (Details) Network

*

*

 http://www.ing.com/role/ConsolidatedCompaniesAndBusinessAcquiredAndDivestedGoodwillRecognisedDetails
4017 Disclosure of detailed information about business combination [table] Table

*

*

 ifrs-full:DisclosureOfBusinessCombinationsTable
4018 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
4019 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
4020 Payvision Holding BV [Member] Member ing:PayvisionHoldingBvMember
4021 Disclosure of detailed information about business combination [line items] LineItems ifrs-full:DisclosureOfBusinessCombinationsLineItems
4022 Total purchase consideration Concept (Monetary) As Of Credit ifrs-full:AcquisitiondateFairValueOfTotalConsiderationTransferred
4023 Net identifiable assets acquired Concept (Monetary) As Of Debit ifrs-full:IdentifiableAssetsAcquiredLiabilitiesAssumed
4024 Goodwill recognised Concept (Monetary) As Of Debit ifrs-full:GoodwillRecognisedAsOfAcquisitionDate
4025 044604 - Disclosure - Consolidated Companies and Business Acquired and Divested - Additional Information (Detail) Network

*

*

 http://www.ing.com/role/ConsolidatedCompaniesAndBusinessAcquiredAndDivestedAdditionalInformationDetail
4026 Assets and Liabilities Held for Sale [Table] Table

*

*

 ing:AssetsAndLiabilitiesHeldForSaleTable
4027 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
4028 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
4029 NN Group [member] Member ing:NNGroupMember
4030 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
4031 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
4032 Payvision Holding BV [Member] Member ing:PayvisionHoldingBvMember
4033 Makelaarsland B.V [Member] Member ing:MakelaarslandBVMember
4034 Range [axis] Axis ifrs-full:RangeAxis
4035 Ranges [member] Member ifrs-full:RangesMember
4036 Minimum [member] Member ifrs-full:BottomOfRangeMember
4037 Maximum [member] Member ifrs-full:TopOfRangeMember
4038 Items of contingent liabilities [axis] Axis ifrs-full:ItemsOfContingentLiabilitiesAxis
4039 Items of contingent liabilities [member] Member ifrs-full:ItemsOfContingentLiabilitiesMember
4040 6 Months After Completion of Acquisition [Member] Member ing:FirstTrancheMember
4041 6 Months After Achieving Milestone 1 [Member] Member ing:SecondTrancheMember
4042 3 Months After Achieving Milestone 2 [Member] Member ing:ThirdTrancheMember
4043 Continuing and discontinued operations [axis] Axis ifrs-full:ContinuingAndDiscontinuedOperationsAxis
4044 Continuing operations [member] Member ifrs-full:ContinuingOperationsMember
4045 Discontinued operations [member] Member ifrs-full:DiscontinuedOperationsMember
4046 Legal Entity [Axis] Axis dei:LegalEntityAxis
4047 Entity [Domain] Member dei:EntityDomain
4048 ING Lease Italy [Member] Member ing:IngLeaseItalyMember
4049 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
4050 Financial instruments, class [member] Member ifrs-full:ClassesOfFinancialInstrumentsMember
4051 Senior Loan Facility [Member] Member ing:SeniorLoanFacilityMember
4052 Assets and Liabilities Held for Sale [Line Items] LineItems ing:AssetsAndLiabilitiesHeldForSaleLineItems
4053 Percentage of voting equity interests acquired Concept (Percent) As Of ifrs-full:PercentageOfVotingEquityInterestsAcquired
4054 Total purchase consideration Concept (Monetary) As Of Credit ifrs-full:AcquisitiondateFairValueOfTotalConsiderationTransferred
4055 Goodwill recognised Concept (Monetary) As Of Debit ifrs-full:GoodwillRecognisedAsOfAcquisitionDate
4056 Share purchase agreement possible acquisition percent of shares Concept (Percent) For Period ing:SharePurchaseAgreementPossibleAcquisitionPercentOfShares
4057 Share purchase agreement possible put option exercisable window period Concept (xbrli:durationItemType) For Period ing:SharePurchaseAgreementPossiblePutOptionExercisableWindowPeriod
4058 Share purchase agreement maximum fair value of business possible for put option exercisable at stated exercise price Concept (Monetary) As Of ing:SharePurchaseAgreementMaximumFairValueOfBusinessPossibleForPutOptionExercisableAtStatedExercisePrice
4059 Share purchase agreement stated exercise price under maximum fair value of business possible for put option exercisable at stated exercise price Concept (Share) As Of ing:SharePurchaseAgreementStatedExercisePriceUnderMaximumFairValueOfBusinessPossibleForPutOptionExercisableAtStatedExercisePrice
4060 Share purchase agreement possible call option exercisable window period Concept (xbrli:durationItemType) For Period ing:SharePurchaseAgreementPossibleCallOptionExercisableWindowPeriod
4061 Put option, exercisable by the non-controlling interest shareholders Concept (Monetary) As Of Credit ing:PutOptionExercisableByTheNonControllingInterestShareholders
4062 Contingent Consideration Concept (Monetary) As Of Credit ifrs-full:ContingentLiabilitiesRecognisedInBusinessCombination
4063 Contingent consideration Concept (Monetary) As Of Debit ifrs-full:ContingentConsiderationArrangementsAndIndemnificationAssetsRecognisedAsOfAcquisitionDate
4064 Acquisition costs Concept (Monetary) For Period Debit ifrs-full:AcquisitionrelatedCostsRecognisedAsExpenseForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination
4065 Goodwill Expected Deductible For Tax Purposes Concept (Monetary) As Of Debit ifrs-full:GoodwillExpectedDeductibleForTaxPurposes
4066 Goodwill Not Deductible For Tax Purposes Concept (Monetary) As Of Debit ing:GoodwillNotDeductibleForTaxPurposes
4067 Revenues acquired business contributed Concept (Monetary) For Period Credit ifrs-full:RevenueOfAcquiree
4068 Net profit from acquired business Concept (Monetary) For Period Credit ifrs-full:ProfitLossOfAcquiree
4069 Consolidated revenues as if combination occurred at beginning of period Concept (Monetary) For Period Credit ifrs-full:RevenueOfCombinedEntity
4070 Consolidated net profit as if combination occurred at beginning of period Concept (Monetary) For Period Credit ifrs-full:ProfitLossOfCombinedEntity
4071 Portion Of Consideration Paid Received Consisting Of Cash And Cash Equivalent Concept (Monetary) For Period Credit ifrs-full:PortionOfConsiderationPaidReceivedConsistingOfCashAndCashEquivalents
4072 Debt Issued in Connection with Discountinued Operations Concept (Monetary) As Of Credit ing:DebtIssuedInConnectionWithDiscountinuedOperations
4073 Lease Receivables Concept (Monetary) As Of Debit ifrs-full:LoansAndReceivables
4074 044701 - Disclosure - Principal Subsidiaries Investments in Associates and Joint Ventures - Summary of Principal Subsidiaries, Investments in Associates and Joint Ventures (Detail) Network

*

*

 http://www.ing.com/role/PrincipalSubsidiariesInvestmentsInAssociatesAndJointVenturesSummaryOfPrincipalSubsidiariesInvestmentsInAssociatesAndJointVenturesDetail
4075 Disclosure Of Significant Investments In Principal Subsidiaries Associates And Joint Ventures [Table] Table

*

*

 ing:DisclosureOfSignificantInvestmentsInPrincipalSubsidiariesAssociatesAndJointVenturesTable
4076 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
4077 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
4078 ING Bank N.V. [member] Member ing:INGBankNVMember
4079 Bank Mendes Gans N.V. [member] Member ing:BankMendesGansNVMember
4080 ING Lease (Nederland) B.V. [member] Member ing:IngLeaseNederlandBVMember
4081 Record Bank [Member] Member ing:RecordBankMember
4082 ING Belgium S.A./N.V. [Member] Member ing:INGBelgiumSANVMember
4083 ING Luxembourg S.A. [member] Member ing:IngLuxembourgSAMember
4084 ING-DiBa AG [Member] Member ing:IngDibaagMember
4085 ING Bank Slaski S.A. [Member] Member ing:IngBankSlaskiSAMember
4086 ING Financial Holdings Corporation [member] Member ing:IngFinancialHoldingsCorporationMember
4087 ING Bank A.S. [member] Member ing:IngBankASMember
4088 ING Bank (Australia) Limited [member] Member ing:IngBankAustraliaLimitedMember
4089 ING Bank (Eurasia) Joint Stock Company [member] Member ing:IngBankEurasiaJointStockCompanyMember
4090 ING Commercial Finance B.V. [Member] Member ing:IngCommercialFinanceBvMember
4091 ING GroenBank N.V. [Member] Member ing:IngGroenbankNvMember
4092 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
4093 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
4094 Netherlands [member] Member country:NL
4095 Belgium [member] Member country:BE
4096 Luxembourg [member] Member country:LU
4097 Germany [member] Member country:DE
4098 Poland [member] Member country:PL
4099 United States [member] Member country:US
4100 Turkey [member] Member country:TR
4101 Australia [member] Member country:AU
4102 Russia [member] Member country:RU
4103 Thailand [Member] Member country:TH
4104 Associates [axis] Axis ifrs-full:SignificantInvestmentsInAssociatesAxis
4105 Entity's total for associates [member] Member ifrs-full:EntitysTotalForAssociatesMember
4106 TMB Public Company Limited. [member] Member ifrs-full:AssociatesMember
4107 Disclosure Of Significant Investments In Principal Subsidiaries Associates And Joint Ventures [Line Items] LineItems ing:DisclosureOfSignificantInvestmentsInPrincipalSubsidiariesAssociatesAndJointVenturesLineItems
4108 Principal place of business of associate Concept (Text/String) For Period ifrs-full:PrincipalPlaceOfBusinessOfAssociate
4109 Interest held Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInAssociate
4110 Statutory place of Incorporation Concept (Text/String) For Period ifrs-full:PrincipalPlaceOfBusinessOfSubsidiary
4111 Proportion of ownership and interest held by the group Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInSubsidiary
4112 Proportion Of Ownership Interests Held By Noncontrolling Interests Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestsHeldByNoncontrollingInterests
4113 044702 - Disclosure - Principal Subsidiaries, Investments in Associates and Joint Ventures - Additional Information (Detail) Network

*

*

 http://www.ing.com/role/PrincipalSubsidiariesInvestmentsInAssociatesAndJointVenturesAdditionalInformationDetail
4114 Disclosure Of Significant Investments In Principal Subsidiaries Associates And Joint Ventures [Table] Table

*

*

 ing:DisclosureOfSignificantInvestmentsInPrincipalSubsidiariesAssociatesAndJointVenturesTable
4115 Range [axis] Axis ifrs-full:RangeAxis
4116 Ranges [member] Member ifrs-full:RangesMember
4117 Minimum [member] Member ifrs-full:BottomOfRangeMember
4118 Maximum [member] Member ifrs-full:TopOfRangeMember
4119 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
4120 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
4121 ING Bank N.V. [member] Member ing:INGBankNVMember
4122 Disclosure Of Significant Investments In Principal Subsidiaries Associates And Joint Ventures [Line Items] LineItems ing:DisclosureOfSignificantInvestmentsInPrincipalSubsidiariesAssociatesAndJointVenturesLineItems
4123 Proportion of ownership interest in subsidiary Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInSubsidiary
4124 Proportion of voting power held in subsidiary Concept (Percent) For Period ifrs-full:ProportionOfVotingPowerHeldInSubsidiary
4125 Name of subsidiary Concept (Text/String) For Period ifrs-full:NameOfSubsidiary
4126 Principal investments in associates Concept (Percent) For Period ifrs-full:ProportionOfVotingPowerHeldInAssociate
4127 044801 - Disclosure - Structured Entities - Covered Bond Programme (Detail) Network

*

*

 http://www.ing.com/role/StructuredEntitiesCoveredBondProgrammeDetail
4128 Disclosure of information about consolidated structured entities [table] Table

*

*

 ifrs-full:DisclosureOfInformationAboutConsolidatedStructuredEntitiesTable
4129 Consolidated structured entities [axis] Axis ifrs-full:ConsolidatedStructuredEntitiesAxis
4130 Entity's total for consolidated structured entities [member] Member ifrs-full:EntitysTotalForConsolidatedStructuredEntitiesMember
4131 Dutch Covered Bond Companies [member] Member ing:CoveredBondCompanyMember
4132 Disclosure of information about consolidated structured entities [line items] LineItems ifrs-full:DisclosureOfInformationAboutConsolidatedStructuredEntitiesLineItems
4133 Fair value pledged mortgage loans Concept (Monetary) As Of Credit ing:FairValuePledgedMortgageLoans
4134 Cash balance structured entity Concept (Monetary) As Of Debit ing:CashBalanceOfStructuredEntity
4135 044802 - Disclosure - Structured Entities - Additional Information (Detail) Network

*

*

 http://www.ing.com/role/StructuredEntitiesAdditionalInformationDetail
4136 Disclosure of information about consolidated structured entities [table] Table

*

*

 ifrs-full:DisclosureOfInformationAboutConsolidatedStructuredEntitiesTable
4137 Consolidated structured entities [axis] Axis ifrs-full:ConsolidatedStructuredEntitiesAxis
4138 Entity's total for consolidated structured entities [member] Member ifrs-full:EntitysTotalForConsolidatedStructuredEntitiesMember
4139 Third party securitisation vehicles [member] Member ing:ThirdPartySecuritisationVehiclesMember
4140 Consolidated Structured Entities [Member] Member ifrs-full:ConsolidatedStructuredEntitiesMember
4141 Investment Securities Class [Axis] Axis invest:InvestmentSecuritiesClassAxis
4142 Investment Securities Class [Domain] Member invest:InvestmentSecuritiesClassDomain
4143 AAA rated Notes [member] Member ing:AAARatedNotesMember
4144 Subordinated notes, issued externally [member] Member ing:SubordinatedNotesIssuedExternallyMember
4145 Legal Entity [Axis] Axis dei:LegalEntityAxis
4146 Entity [Domain] Member dei:EntityDomain
4147 Mont Blanc [member] Member ing:MontBlancMember
4148 Subsidiaries in Germany, Belgium and Australia [Member] Member ing:SubsidiariesInGermanyBelgiumAndAustraliaMember
4149 Continuing involvement in derecognised financial assets by type of transfer [axis] Axis ifrs-full:ContinuingInvolvementInDerecognisedFinancialAssetsByTypeOfTransferAxis
4150 Types of transfer [member] Member ifrs-full:TypesOfTransferMember
4151 Securitisations [member] Member ifrs-full:SecuritisationsMember
4152 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
4153 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
4154 Swap Contract [Member] Member ifrs-full:SwapContractMember
4155 Disclosure of information about consolidated structured entities [line items] LineItems ifrs-full:DisclosureOfInformationAboutConsolidatedStructuredEntitiesLineItems
4156 Structured entity issues Concept (Text/String) For Period ifrs-full:DescriptionOfHowEntityDeterminedWhichStructuredEntitiesItSponsored
4157 Securitisations Concept (Monetary) For Period ifrs-full:SupportProvidedToStructuredEntityWithoutHavingContractualObligationToDoSo
4158 Non- Controlling interests Concept (Monetary) As Of Credit ifrs-full:NoncontrollingInterests
4159 Liquid facilities Concept (Monetary) As Of Credit ifrs-full:UndrawnBorrowingFacilities
4160 Drawn facility Concept (Monetary) As Of Credit ifrs-full:OtherBorrowings
4161 Transfer of financial assets Concept (Monetary) For Period Credit ifrs-full:AssetsTransferredToStructuredEntitiesAtTimeOfTransfer
4162 Fair value of swap Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValue
4163 Fair value of changes Concept (Monetary) For Period ifrs-full:GainsLossesRecognisedInProfitOrLossFairValueMeasurementAssets
4164 Fee income recognised Concept (Monetary) For Period Credit ifrs-full:IncomeFromStructuredEntities
4165 Bonds Issued Concept (Monetary) As Of Credit ifrs-full:BondsIssued
4166 044901 - Disclosure - Related Parties - Significant Investments in Subsidiaries Associates and Joint Ventures (Detail) Network

*

*

 http://www.ing.com/role/RelatedPartiesSignificantInvestmentsInSubsidiariesAssociatesAndJointVenturesDetail
4167 Disclosure of subsidiaries [table] Table

*

*

 ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesTable
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4171 Joint ventures [member] Member ifrs-full:JointVenturesWhereEntityIsVenturerMember
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4179 Income received Concept (Monetary) For Period Credit ifrs-full:RevenueFromRenderingOfServicesRelatedPartyTransactions
4180 Expenses paid Concept (Monetary) For Period Debit ifrs-full:ServicesExpense
4181 044902 - Disclosure - Related Parties - Key Management Personnel compensation (executive and management board) (Detail) Network

*

*

 http://www.ing.com/role/RelatedPartiesKeyManagementPersonnelCompensationexecutiveAndManagementBoardDetail
4182 Disclosure of key management personnel compensation [table] Table

*

*

 ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesTable
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4186 Management Board Banking [member] Member ifrs-full:OtherRelatedPartiesMember
4187 Disclosure of key management personnel compensation [Line Items] LineItems ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems
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4190 - Collective fixed allowances Concept (Monetary) For Period Debit ing:KeyManagementPersonnelCompensationCollectiveFixedAllowances
4191 - Pension costs Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationPostemploymentBenefits
4192 - Severance benefits Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationTerminationBenefits
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4195 - Upfront shares Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationSharebasedPayment
4196 - Deferred cash Concept (Monetary) For Period Debit ing:KeyManagementPersonnelCompensationDeferredCash
4197 - Deferred shares Concept (Monetary) For Period Debit ing:KeyManagementPersonnelCompensationDeferredShares
4198 - Other Concept (Monetary) For Period Debit ing:KeyManagementPersonnelCompensationOtherVariableCompensation
4199 Total compensation Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensation
4200 044903 - Disclosure - Related Parties - Key Management Personnel Compensation Of Supervisory Board (Detail) Network

*

*

 http://www.ing.com/role/RelatedPartiesKeyManagementPersonnelCompensationOfSupervisoryBoardDetail
4201 Disclosure of key management personnel compensation [table] Table

*

*

 ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesTable
4202 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
4203 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
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4205 Disclosure of key management personnel compensation [Line Items] LineItems ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems
4206 Total compensation Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensation
4207 044904 - Disclosure - Related Parties - Loan and Advances to Key Management Personnel Explanatory (Detail) Network

*

*

 http://www.ing.com/role/RelatedPartiesLoanAndAdvancesToKeyManagementPersonnelExplanatoryDetail
4208 Disclosure of key management personnel compensation [table] Table

*

*

 ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesTable
4209 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
4210 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
4211 Executive board of ING Groep N.V. [member] Member ifrs-full:KeyManagementPersonnelOfEntityOrParentMember
4212 Management Board Banking [member] Member ifrs-full:OtherRelatedPartiesMember
4213 Supervisory Board [member] Member ing:SupervisoryBoardMember
4214 Disclosure of key management personnel compensation [Line Items] LineItems ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems
4215 Amount outstanding 31 December Concept (Monetary) As Of Credit ifrs-full:OutstandingCommitmentsMadeOnBehalfOfEntityRelatedPartyTransactions
4216 Average interest rate Concept (Percent) As Of ifrs-full:BorrowingsInterestRate
4217 Repayments Concept (Monetary) For Period Credit ifrs-full:RepaymentsOfBorrowingsClassifiedAsFinancingActivities
4218 044905 - Disclosure - Related Parties - Number of ING Groep N.V. shares and stock options to key management personnel (Detail) Network

*

*

 http://www.ing.com/role/RelatedPartiesNumberOfINGGroepNVSharesAndStockOptionsToKeyManagementPersonnelDetail
4219 Disclosure of key management personnel compensation [table] Table

*

*

 ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesTable
4220 Legal Entity [Axis] Axis dei:LegalEntityAxis
4221 Entity [Domain] Member dei:EntityDomain
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4226 Management Board of I N G Bank NV [,ember] Member ing:ManagementBoardOfINGBankNVMember
4227 Supervisory Board [member] Member ing:SupervisoryBoardMember
4228 Disclosure of key management personnel compensation [Line Items] LineItems ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems
4229 Number of shares Concept (Shares) As Of ifrs-full:NumberOfSharesIssued
4230 Number of stock options Concept (Decimal) As Of ifrs-full:NumberOfOutstandingShareOptions
4231 044906 - Disclosure - Related parties - Additional Information (Detail) Network

*

*

 http://www.ing.com/role/RelatedPartiesAdditionalInformationDetail
4232 Implied Table Table

*

*

 implied:Table
4233 Related party transactions [abstract] Abstract ifrs-full:RelatedPartyTransactionsAbstract
4234 Provision for doubtful debts Concept (Monetary) As Of Credit ifrs-full:ProvisionsForDoubtfulDebtsRelatedToOutstandingBalancesOfRelatedPartyTransaction
4235 Vesting of variable remuneration Concept (Monetary) For Period Debit ing:FixedExpensesAndVestingOfVariableRemunerationExpenses
4236 044906 - Disclosure - Related Parties - Summery of Information About Key Management Personnel (Parenthetical) (Detail) Network

*

*

 http://www.ing.com/role/RelatedPartiesSummeryOfInformationAboutKeyManagementPersonnelParentheticalDetail
4237 Implied Table Table

*

*

 implied:Table
4238 Disclosure of key management personnel compensation [abstract] Abstract ing:DisclosureOfKeyManagementPersonnelCompensationAbstract
4239 Percentage saving allowances Concept (Percent) For Period ing:IndividualSavingsAllowancePercentage
4240 Collective saving allowances for loss pension benefits Concept (Monetary) For Period Debit ing:CollectiveSavingAllowancesForLossPensionBenefits
4241 046015 - Disclosure - Risk Management Section - Summary of ING Bank portfolio per line of business, outstandings (Detail) Network

*

*

 http://www.ing.com/role/RiskManagementSectionSummaryOfINGBankPortfolioPerLineOfBusinessOutstandingsDetail
4242 Disclosure of credit risk exposure [table] Table

*

*

 ifrs-full:DisclosureOfCreditRiskExposureTable
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4246 Retail Benelux [member] Member ing:RetailBeneluxMember
4247 Retail Challengers & Growth Markets [member] Member ing:RetailChallengersAndGrowthMarketsMember
4248 Corporate Line [member] Member ing:CorporateLineMember
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4252 3 (AA) [member] Member ing:AACreditGradesMember
4253 6 (A) [member] Member ing:ACreditGradesMember
4254 9 (BBB) [member] Member ing:BBBCreditGradesMember
4255 12 (BB) [member] Member ing:BBCreditGradesMember
4256 15 (B) [Member] Member ing:BCreditGradesMember
4257 17-19(CCC & NPL [member] Member ing:CccNplMember
4258 17 (CCC) [member] Member ing:CcccreditgradesMember
4259 18 (CC) [member] Member ing:CcCreditGradesMember
4260 19 (C) [member] Member ing:CCreditGradesMember
4261 20-22 (D) Member ing:DefaultCreditGradeMember
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4264 Private Individuals [member] Member ing:PrivateIndividualsMember
4265 Commercial Banks [member] Member ing:CommercialBanksMember
4266 Natural resources [Member] Member ing:NaturalResourcesMember
4267 Real estate 1 [member] Member ing:RealEstate1Member
4268 Central Governments [member] Member ing:CentralGovernmentsMember
4269 Non-Bank Financial Institutions [member] Member ing:NonbankFinancialInstitutionsMember
4270 Transportation and logistics [member] Member ing:TransportationAndLogisticsMember
4271 Central Banks [Member] Member ing:CentralBanksMember
4272 Services [Member] Member ing:ServicesMember
4273 Food, Beverages & Personal Care [Member] Member ing:FoodBeveragesPersonalCareMember
4274 Lower Public Administration [Member] Member ing:LowerPublicAdministrationMember
4275 General Industries [Member] Member ing:GeneralIndustriesMember
4276 Chemicals Health and Pharmaceuticals [Member] Member ing:ChemicalsHealthAndPharmaceuticalsMember
4277 Other economic sector [member] Member ing:OtherEconomicSectorMember
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4280 Netherlands [member] Member country:NL
4281 Germany [member] Member country:DE
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4284 Americas [Member] Member srt:AmericasMember
4285 Asia Pacific [Member] Member srt:AsiaPacificMember
4286 Australia [member] Member country:AU
4287 Rest Of World [Member] Member ing:RestOfWorldMember
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4289 portfolio per line of business, % of outstanding Concept (Percent) As Of ing:PercentageOfCreditExposure
4290 Outstanding amount in portfolio Concept (Monetary) As Of ifrs-full:MaximumExposureToCreditRisk
4291 046018 - Disclosure - Risk Management Section - ING Bank portfolio, outstandings by economic sectors and geographical area (Detail) Network

*

*

 http://www.ing.com/role/RiskManagementSectionINGBankPortfolioOutstandingsByEconomicSectorsAndGeographicalAreaDetail
4292 Disclosure of credit risk exposure [table] Table

*

*

 ifrs-full:DisclosureOfCreditRiskExposureTable
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4295 Private Individuals [member] Member ing:PrivateIndividualsMember
4296 Commercial Banks [member] Member ing:CommercialBanksMember
4297 Natural resources [Member] Member ing:NaturalResourcesMember
4298 Real estate 1 [member] Member ing:RealEstate1Member
4299 Central Governments [member] Member ing:CentralGovernmentsMember
4300 Non-Bank Financial Institutions [member] Member ing:NonbankFinancialInstitutionsMember
4301 Transportation and logistics [member] Member ing:TransportationAndLogisticsMember
4302 Central Banks [Member] Member ing:CentralBanksMember
4303 Services [Member] Member ing:ServicesMember
4304 Food, Beverages & Personal Care [Member] Member ing:FoodBeveragesPersonalCareMember
4305 Lower Public Administration [Member] Member ing:LowerPublicAdministrationMember
4306 General Industries [Member] Member ing:GeneralIndustriesMember
4307 Chemicals Health and Pharmaceuticals [Member] Member ing:ChemicalsHealthAndPharmaceuticalsMember
4308 Other economic sector [member] Member ing:OtherEconomicSectorMember
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4312 Belgium [member] Member country:BE
4313 Germany [member] Member country:DE
4314 Rest of Europe [Member] Member ing:RestOfEuropeMember
4315 Australia [member] Member country:AU
4316 Asia Pacific [Member] Member srt:AsiaPacificMember
4317 Americas [Member] Member srt:AmericasMember
4318 Africa [Member] Member srt:AfricaMember
4319 Internal credit grades [axis] Axis ifrs-full:InternalCreditGradesAxis
4320 Entity's total for internal credit grades [member] Member ifrs-full:EntitysTotalForInternalCreditGradesMember
4321 Investment grade [member] Member ing:InvestmentGradeMember
4322 Non-investment grade [member] Member ing:NoninvestmentGradeWholesaleMember
4323 Substandard grade [member] Member ing:SubstandardGradeMember
4324 Non-performing grade [member] Member ing:NonperformingGradeMember
4325 Disclosure of credit risk exposure [line items] LineItems ifrs-full:DisclosureOfCreditRiskExposureLineItems
4326 portfolio per line of business, % of outstanding Concept (Percent) As Of ing:PercentageOfCreditExposure
4327 Outstanding amount in portfolio Concept (Monetary) As Of ifrs-full:MaximumExposureToCreditRisk
4328 046019 - Disclosure - Risk Management Section - ING Bank Portfolio, by Geographic Area (Parenthetical) (Detail) Network

*

*

 http://www.ing.com/role/RiskManagementSectionINGBankPortfolioByGeographicAreaParentheticalDetail
4329 Disclosure of credit risk exposure [table] Table

*

*

 ifrs-full:DisclosureOfCreditRiskExposureTable
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4333 Poland [member] Member country:PL
4334 France [member] Member country:FR
4335 Spain [member] Member country:ES
4336 Italy [member] Member country:IT
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4338 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
4339 Rest of Europe [Member] Member ing:RestOfEuropeMember
4340 Disclosure of credit risk exposure [line items] LineItems ifrs-full:DisclosureOfCreditRiskExposureLineItems
4341 Percentage of country risk exposures Concept (Percent) For Period ing:PercentageOfCountryRiskExposure
4342 046020 - Disclosure - Risk Management Section - Cover Values Including Guarantees Received - Total ING Bank (Detail) Network

*

*

 http://www.ing.com/role/RiskManagementSectionCoverValuesIncludingGuaranteesReceivedTotalINGBankDetail
4343 Disclosure of credit risk exposure [table] Table

*

*

 ifrs-full:DisclosureOfCreditRiskExposureTable
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4346 No cover [member] Member ing:NoCoverMember
4347 Partially covered [member] Member ing:PartiallyCoveredMember
4348 Fully covered [member] Member ing:FullyCoveredMember
4349 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
4350 Risks [member] Member ifrs-full:TypesOfRisksMember
4351 Consumer Lending [member] Member ing:ConsumerLendingMember
4352 Business Lending [member] Member ing:BusinessLendingMember
4353 Investment and Money Market [member] Member ing:InvestmentAndMoneyMarketMember
4354 Aggregate lending, investment and money market [member] Member ing:AggregateLendingInvestmentAndMoneyMarketMember
4355 Pre-settlement [member] Member ing:Presettlement1Member
4356 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
4357 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
4358 Mortgages [member] Member ifrs-full:MortgagesMember
4359 Eligible Financial Collateral [Member] Member ing:EligibleFinancialCollateralMember
4360 Other CRR/CRD IV eligible [Member] Member ing:OtherCrrcrdIvEligibleMember
4361 Guarantees [member] Member ifrs-full:GuaranteesMember
4362 Non CRR/CRD IV eligible [Member] Member ing:NonCrrcrdIvEligibleMember
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4364 Outstandings Concept (Monetary) As Of ifrs-full:MaximumExposureToCreditRisk
4365 Cover type Concept (Monetary) As Of ifrs-full:AmountByWhichLoansOrReceivablesRelatedCreditDerivativesOrSimilarInstrumentsMitigateMaximumExposureToCreditRisk
4366 Value to Loan Concept (Percent) For Period ing:PercentageOfLoanToValue
4367 046022 - Disclosure - Risk Management Section - Cover Values Including Guarantees Received - Consumer Lending Portfolio (Detail) Network

*

*

 http://www.ing.com/role/RiskManagementSectionCoverValuesIncludingGuaranteesReceivedConsumerLendingPortfolioDetail
4368 Disclosure of credit risk exposure [table] Table

*

*

 ifrs-full:DisclosureOfCreditRiskExposureTable
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4372 Greater than zero percentage to twenty five percentage [member] Member ing:GreaterThanZeroPercentageToTwentyFivePercentageMember
4373 Greater than twenty five percentage to fifty percentage [member] Member ing:GreaterThanTwentyFivePercentageToFiftyPercentageMember
4374 Greater than fifty percentage to seventy five percentage [member] Member ing:GreaterThanFiftyPercentageToSeventyFivePercentageMember
4375 Greater than seventy five percentage to less than hundred percentage [member] Member ing:GreaterThanSeventyFivePercentageToLessThanHundredPercentageMember
4376 Hundred Percentage [Member] Member ing:HundredPercentageMember
4377 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
4378 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
4379 Mortgages [member] Member ifrs-full:MortgagesMember
4380 Eligible Financial Collateral [Member] Member ing:EligibleFinancialCollateralMember
4381 Other CRR/CRD IV eligible [Member] Member ing:OtherCrrcrdIvEligibleMember
4382 Guarantees [member] Member ifrs-full:GuaranteesMember
4383 Non CRR/CRD IV eligible [Member] Member ing:NonCrrcrdIvEligibleMember
4384 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
4385 Financial instruments, class [member] Member ifrs-full:ClassesOfFinancialInstrumentsMember
4386 Residential Mortgages (Private Individuals) [Member] Member ing:ResidentialMortgageLoansMember
4387 Residential Mortgages (SME) [member] Member ing:ResidentialMortgagesMember
4388 Other Consumer Lending [Member] Member ing:OtherConsumerLendingMember
4389 Internal credit grades [axis] Axis ifrs-full:InternalCreditGradesAxis
4390 Entity's total for internal credit grades [member] Member ifrs-full:EntitysTotalForInternalCreditGradesMember
4391 Performing [member] Member ing:PerformingMember
4392 Non-performing [member] Member ing:NonperformingMember
4393 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
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4395 Consumer Lending [member] Member ing:ConsumerLendingMember
4396 Disclosure of credit risk exposure [line items] LineItems ifrs-full:DisclosureOfCreditRiskExposureLineItems
4397 Outstandings Concept (Monetary) As Of ifrs-full:MaximumExposureToCreditRisk
4398 Derivative instruments to reduce credit risk of loan Concept (Monetary) As Of ifrs-full:AmountByWhichLoansOrReceivablesRelatedCreditDerivativesOrSimilarInstrumentsMitigateMaximumExposureToCreditRisk
4399 Value to Loan Concept (Percent) For Period ing:PercentageOfLoanToValue
4400 046025 - Disclosure - Risk Management Section - Cover Values Including Guarantees Received - Business Lending Portfolio Per Economic Sector (Detail) Network

*

*

 http://www.ing.com/role/RiskManagementSectionCoverValuesIncludingGuaranteesReceivedBusinessLendingPortfolioPerEconomicSectorDetail
4401 Disclosure of credit risk exposure [table] Table

*

*

 ifrs-full:DisclosureOfCreditRiskExposureTable
4402 Types of interest rates [axis] Axis ifrs-full:TypesOfInterestRatesAxis
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4405 Greater than zero percentage to twenty five percentage [member] Member ing:GreaterThanZeroPercentageToTwentyFivePercentageMember
4406 Greater than twenty five percentage to fifty percentage [member] Member ing:GreaterThanTwentyFivePercentageToFiftyPercentageMember
4407 Greater than fifty percentage to seventy five percentage [member] Member ing:GreaterThanFiftyPercentageToSeventyFivePercentageMember
4408 Greater than seventy five percentage to less than hundred percentage [member] Member ing:GreaterThanSeventyFivePercentageToLessThanHundredPercentageMember
4409 Hundred Percentage [Member] Member ing:HundredPercentageMember
4410 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
4411 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
4412 Mortgages [member] Member ifrs-full:MortgagesMember
4413 Eligible Financial Collateral [Member] Member ing:EligibleFinancialCollateralMember
4414 Other CRR/CRD IV eligible [Member] Member ing:OtherCrrcrdIvEligibleMember
4415 Guarantees [member] Member ifrs-full:GuaranteesMember
4416 Non CRR/CRD IV eligible [Member] Member ing:NonCrrcrdIvEligibleMember
4417 Internal credit grades [axis] Axis ifrs-full:InternalCreditGradesAxis
4418 Entity's total for internal credit grades [member] Member ifrs-full:EntitysTotalForInternalCreditGradesMember
4419 Non-performing [member] Member ing:NonperformingMember
4420 Scenario [Axis] Axis us-gaap:StatementScenarioAxis
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4422 Scenario, Previously Reported [Member] Member srt:ScenarioPreviouslyReportedMember
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4425 Business Lending [member] Member ing:BusinessLendingMember
4426 Markets of customers [axis] Axis ifrs-full:MarketsOfCustomersAxis
4427 Markets Of Customers [Member] Member ifrs-full:MarketsOfCustomersMember
4428 Natural resources [Member] Member ing:NaturalResourcesMember
4429 Real estate [member] Member ing:RealEstate1Member
4430 Central Banks [Member] Member ing:CentralBanksMember
4431 Transportation & Logistics [member] Member ing:TransportationAndLogisticsMember
4432 Commercial Banks [member] Member ing:CommercialBanksMember
4433 Services [Member] Member ing:ServicesMember
4434 Non-Bank Financial Institutions [member] Member ing:NonbankFinancialInstitutionsMember
4435 Food, Beverages & Personal Care [member] Member ing:FoodBeveragesPersonalCareMember
4436 General Industries [Member] Member ing:GeneralIndustriesMember
4437 Chemicals, Health & Pharmaceuticals [Member] Member ing:ChemicalsHealthAndPharmaceuticalsMember
4438 Utilities [member] Member ing:UtilitiesMember
4439 Other economic sector [member] Member ing:OtherEconomicSectorMember
4440 Central Governments [member] Member ing:CentralGovernmentsMember
4441 Builders And Contractors [Member] Member ing:BuildersAndContractorsMember
4442 Private Individuals [member] Member ing:PrivateIndividualsMember
4443 Lower Public Administration [Member] Member ing:LowerPublicAdministrationMember
4444 Disclosure of credit risk exposure [line items] LineItems ifrs-full:DisclosureOfCreditRiskExposureLineItems
4445 Outstandings Concept (Monetary) As Of ifrs-full:MaximumExposureToCreditRisk
4446 Derivative instruments to reduce credit risk of loan Concept (Monetary) As Of ifrs-full:AmountByWhichLoansOrReceivablesRelatedCreditDerivativesOrSimilarInstrumentsMitigateMaximumExposureToCreditRisk
4447 Value to Loan Concept (Percent) For Period ing:PercentageOfLoanToValue
4448 046026 - Disclosure - Risk Management Section - Cover Values Including Guarantees Received - Business Lending Portfolio Per Region (Detail) Network

*

*

 http://www.ing.com/role/RiskManagementSectionCoverValuesIncludingGuaranteesReceivedBusinessLendingPortfolioPerRegionDetail
4449 Disclosure of credit risk exposure [table] Table

*

*

 ifrs-full:DisclosureOfCreditRiskExposureTable
4450 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
4451 Risks [member] Member ifrs-full:TypesOfRisksMember
4452 Business Lending [member] Member ing:BusinessLendingMember
4453 Types of interest rates [axis] Axis ifrs-full:TypesOfInterestRatesAxis
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4455 No cover [member] Member ing:NoCoverMember
4456 Greater than zero percentage to twenty five percentage [member] Member ing:GreaterThanZeroPercentageToTwentyFivePercentageMember
4457 Greater than twenty five percentage to fifty percentage [member] Member ing:GreaterThanTwentyFivePercentageToFiftyPercentageMember
4458 Greater than fifty percentage to seventy five percentage [member] Member ing:GreaterThanFiftyPercentageToSeventyFivePercentageMember
4459 Greater than seventy five percentage to less than hundred percentage [member] Member ing:GreaterThanSeventyFivePercentageToLessThanHundredPercentageMember
4460 Hundred Percentage [Member] Member ing:HundredPercentageMember
4461 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
4462 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
4463 Mortgages [member] Member ifrs-full:MortgagesMember
4464 Eligible Financial Collateral [Member] Member ing:EligibleFinancialCollateralMember
4465 Other CRR/CRD IV eligible [Member] Member ing:OtherCrrcrdIvEligibleMember
4466 Guarantees [member] Member ifrs-full:GuaranteesMember
4467 Non CRR/CRD IV eligible [Member] Member ing:NonCrrcrdIvEligibleMember
4468 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
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4470 Africa [Member] Member srt:AfricaMember
4471 America [member] Member ing:AmericaMember
4472 Asia [Member] Member srt:AsiaMember
4473 Australia [member] Member country:AU
4474 Belgium [member] Member country:BE
4475 Germany [member] Member country:DE
4476 Netherlands [member] Member country:NL
4477 Rest of Europe [Member] Member ing:RestOfEuropeMember
4478 Internal credit grades [axis] Axis ifrs-full:InternalCreditGradesAxis
4479 Entity's total for internal credit grades [member] Member ifrs-full:EntitysTotalForInternalCreditGradesMember
4480 Non-performing [member] Member ing:NonperformingMember
4481 Disclosure of credit risk exposure [line items] LineItems ifrs-full:DisclosureOfCreditRiskExposureLineItems
4482 Outstandings Concept (Monetary) As Of ifrs-full:MaximumExposureToCreditRisk
4483 Derivative instruments to reduce credit risk of loan Concept (Monetary) As Of ifrs-full:AmountByWhichLoansOrReceivablesRelatedCreditDerivativesOrSimilarInstrumentsMitigateMaximumExposureToCreditRisk
4484 Value to Loan Concept (Percent) For Period ing:PercentageOfLoanToValue
4485 046030 - Disclosure - Risk Management Section - Pre-settlement Portfolio (Detail) Network

*

*

 http://www.ing.com/role/RiskManagementSectionPresettlementPortfolioDetail
4486 Disclosure of offsetting of financial liabilities [table] Table

*

*

 ifrs-full:DisclosureOfOffsettingOfFinancialLiabilitiesTable
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4492 Africa [Member] Member srt:AfricaMember
4493 America [member] Member ing:AmericaMember
4494 Asia [Member] Member srt:AsiaMember
4495 Australia [member] Member country:AU
4496 Belgium [member] Member country:BE
4497 Germany [member] Member country:DE
4498 Netherlands [member] Member country:NL
4499 Rest of Europe [Member] Member ing:RestOfEuropeMember
4500 Internal credit grades [axis] Axis ifrs-full:InternalCreditGradesAxis
4501 Entity's total for internal credit grades [member] Member ifrs-full:EntitysTotalForInternalCreditGradesMember
4502 Non-performing [member] Member ing:NonperformingMember
4503 Valuation techniques used in fair value measurement [axis] Axis ifrs-full:ValuationTechniquesUsedInFairValueMeasurementAxis
4504 Valuation techniques [member] Member ifrs-full:ValuationTechniquesMember
4505 Market Approach [Member] Member ifrs-full:MarketApproachMember
4506 Disclosure of offsetting of financial liabilities [line items] LineItems ifrs-full:DisclosureOfOffsettingOfFinancialLiabilitiesLineItems
4507 Gross amounts of recognised financial assets Concept (Monetary) As Of Debit ifrs-full:GrossFinancialAssetsSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreements
4508 MtM after netting Concept (Monetary) As Of Debit ifrs-full:NetFinancialAssetsSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreementsInStatementOfFinancialPosition
4509 Net amount Concept (Monetary) As Of Debit ifrs-full:NetFinancialAssetsSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreements
4510 Outstanding amount in portfolio Concept (Monetary) As Of ifrs-full:MaximumExposureToCreditRisk
4511 046035 - Disclosure - Risk Management Section - Credit Quality - ING Bank Portfolio, Outstanding (Detail) Network

*

*

 http://www.ing.com/role/RiskManagementSectionCreditQualityINGBankPortfolioOutstandingDetail
4512 Disclosure of offsetting of financial liabilities [table] Table

*

*

 ifrs-full:DisclosureOfOffsettingOfFinancialLiabilitiesTable
4513 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
4514 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
4515 ING Bank portfolio, outstandings [member] Member ing:IngBankPortfolioOutstandingsMember
4516 Probability of default [axis] Axis ifrs-full:ProbabilityOfDefaultAxis
4517 Entity's total for probability of default [member] Member ifrs-full:EntitysTotalForProbabilityOfDefaultMember
4518 Neither past due nor non-performing [member] Member ing:NeitherPastDueNorNonperformingMember
4519 Consumer lending past due but performing (1-90 days) [member] Member ing:ConsumerLendingPastDueButPerformingOneToNinetyDaysMember
4520 Non-performing [member] Member ing:NonperformingMember
4521 Disclosure of offsetting of financial liabilities [line items] LineItems ifrs-full:DisclosureOfOffsettingOfFinancialLiabilitiesLineItems
4522 Financial assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
4523 046037 - Disclosure - Risk Management Section - Aging Analysis (Past Due But Performing) ING Bank consumer lending portfolio, outstandings (Detail) Network

*

*

 http://www.ing.com/role/RiskManagementSectionAgingAnalysisPastDueButPerformingINGBankConsumerLendingPortfolioOutstandingsDetail
4524 Disclosure of offsetting of financial liabilities [table] Table

*

*

 ifrs-full:DisclosureOfOffsettingOfFinancialLiabilitiesTable
4525 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
4526 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
4527 ING Bank consumer lending portfolio, outstandings [member] Member ing:INGBankConsumerLendingPortfolioOutstandingsMember
4528 Past due status [axis] Axis ifrs-full:PastDueStatusAxis
4529 Past due status [member] Member ifrs-full:PastDueStatusMember
4530 Past due for 1-30 days [member] Member ifrs-full:CurrentMember
4531 Past due for 31-60 days [member] Member ifrs-full:LaterThanOneMonthAndNotLaterThanTwoMonthsMember
4532 Past due for 61-90 days [member] Member ifrs-full:LaterThanTwoMonthsAndNotLaterThanThreeMonthsMember
4533 Disclosure of offsetting of financial liabilities [line items] LineItems ifrs-full:DisclosureOfOffsettingOfFinancialLiabilitiesLineItems
4534 Financial assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
4535 046038 - Disclosure - Risk Management Section - Aging Analysis (Past Due But Performing) ING Bank consumer lending portfolio by geographic area, outstandings (Detail) Network

*

*

 http://www.ing.com/role/RiskManagementSectionAgingAnalysisPastDueButPerformingINGBankConsumerLendingPortfolioByGeographicAreaOutstandingsDetail
4536 Disclosure of offsetting of financial liabilities [table] Table

*

*

 ifrs-full:DisclosureOfOffsettingOfFinancialLiabilitiesTable
4537 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
4538 Financial instruments, class [member] Member ifrs-full:ClassesOfFinancialInstrumentsMember
4539 Residential Mortgages [member] Member ing:ResidentialMortgagesMember
4540 Other retail [member] Member ing:OtherRetailMember
4541 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
4542 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
4543 ING Bank consumer lending portfolio, outstandings [member] Member ing:INGBankConsumerLendingPortfolioOutstandingsMember
4544 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
4545 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
4546 Africa [Member] Member srt:AfricaMember
4547 America [member] Member ing:AmericaMember
4548 Asia [Member] Member srt:AsiaMember
4549 Australia [member] Member country:AU
4550 Belgium [member] Member country:BE
4551 Germany [member] Member country:DE
4552 Netherlands [member] Member country:NL
4553 Rest of Europe [Member] Member ing:RestOfEuropeMember
4554 Disclosure of offsetting of financial liabilities [line items] LineItems ifrs-full:DisclosureOfOffsettingOfFinancialLiabilitiesLineItems
4555 Financial assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
4556 046040 - Disclosure - Risk Management Section - Non-performing Loans: ING Bank portfolio portfolio, outstandings by economic sector and business lines (Detail) Network

*

*

 http://www.ing.com/role/RiskManagementSectionNonperformingLoansINGBankPortfolioPortfolioOutstandingsByEconomicSectorAndBusinessLinesDetail
4557 Non-performing loans [table] Table

*

*

 ifrs-full:DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedTable
4558 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
4559 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
4560 Private Individuals [member] Member ing:PrivateIndividualsMember
4561 Natural resources [Member] Member ing:NaturalResourcesMember
4562 Real estate [member] Member ing:RealEstate1Member
4563 Transportation & Logistics [member] Member ing:TransportationLogisticsMember
4564 Builders & Contractors [member] Member ing:BuildersContractorsMember
4565 General Industries [Member] Member ing:GeneralIndustriesMember
4566 Services [Member] Member ing:ServicesMember
4567 Food, Beverages & Personal Care [member] Member ing:FoodBeveragesPersonalCareMember
4568 Other [member] Member ing:OtherMember
4569 Impairment of financial assets [axis] Axis ifrs-full:ImpairmentOfFinancialAssetsAxis
4570 Entity's total for impairment of financial assets [member] Member ifrs-full:EntitysTotalForImpairmentOfFinancialAssetsMember
4571 Non performing Loans [member] Member ifrs-full:FinancialAssetsPastDueButNotImpairedMember
4572 Segments [axis] Axis ifrs-full:SegmentsAxis
4573 Segments [member] Member ifrs-full:SegmentsMember
4574 Wholesale Banking [member] Member ing:WholesaleBankingMember
4575 Retail Benelux [member] Member ing:RetailBeneluxMember
4576 Retail Challengers & Growth Markets [member] Member ing:RetailChallengersAndGrowthMarketsMember
4577 Corporate Line [member] Member ing:CorporateLineMember
4578 Non performing Loans [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedLineItems
4579 Financial assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
4580 046041 - Disclosure - Risk Management Section - Non-performing Loans: ING Bank portfolio, outstandings by economic sectors and geographical area (Details) Network

*

*

 http://www.ing.com/role/RiskManagementSectionNonperformingLoansINGBankPortfolioOutstandingsByEconomicSectorsAndGeographicalAreaDetails
4581 Non-performing loans [table] Table

*

*

 ifrs-full:DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedTable
4582 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
4583 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
4584 Private Individuals [member] Member ing:PrivateIndividualsMember
4585 Natural resources [Member] Member ing:NaturalResourcesMember
4586 Real estate [member] Member ing:RealEstate1Member
4587 Transportation & Logistics [member] Member ing:TransportationLogisticsMember
4588 Builders & Contractors [member] Member ing:BuildersContractorsMember
4589 General Industries [Member] Member ing:GeneralIndustriesMember
4590 Services [Member] Member ing:ServicesMember
4591 Food, Beverages & Personal Care [member] Member ing:FoodBeveragesPersonalCareMember
4592 Other [member] Member ing:OtherMember
4593 Impairment of financial assets [axis] Axis ifrs-full:ImpairmentOfFinancialAssetsAxis
4594 Entity's total for impairment of financial assets [member] Member ifrs-full:EntitysTotalForImpairmentOfFinancialAssetsMember
4595 Non performing Loans [member] Member ifrs-full:FinancialAssetsPastDueButNotImpairedMember
4596 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
4597 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
4598 Netherlands [member] Member country:NL
4599 Germany [member] Member country:DE
4600 Belgium [member] Member country:BE
4601 Rest of Europe [Member] Member ing:RestOfEuropeMember
4602 Australia [member] Member country:AU
4603 Americas [Member] Member srt:AmericasMember
4604 Asia Pacific [Member] Member srt:AsiaPacificMember
4605 Africa [Member] Member srt:AfricaMember
4606 Non performing Loans [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedLineItems
4607 Financial assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
4608 046045 - Disclosure - Risk Management Section - (Loan Loss Provisioning) ING Bank portfolio per line of business, outstandings (Details) Network

*

*

 http://www.ing.com/role/RiskManagementSectionLoanLossProvisioningINGBankPortfolioPerLineOfBusinessOutstandingsDetails
4609 Disclosure of credit risk exposure [table] Table

*

*

 ifrs-full:DisclosureOfCreditRiskExposureTable
4610 External credit grades [axis] Axis ifrs-full:ExternalCreditGradesAxis
4611 Entity's total for external credit grades [member] Member ifrs-full:EntitysTotalForExternalCreditGradesMember
4612 1 (AAA) [member] Member ing:GradeOneMember
4613 2-4 (AA) [member] Member ing:GradeTwoMember
4614 5-7 (A) [member] Member ing:InternalCreditGradeThreeMember
4615 8-10 (BBB) [member] Member ing:InternalCreditGradeFourMember
4616 11-13 (BB) [member] Member ing:InternalCreditGradeFiveMember
4617 14-16 (B) [member] Member ing:InternalGradeSixMember
4618 17 (CCC) [member] Member ing:CcccreditgradesMember
4619 18 (CC) [member] Member ing:CcCreditGradesMember
4620 19 (C) [member] Member ing:CCreditGradesMember
4621 20-22 (D) [member] Member ing:DefaultTwentyToTwentyTwoCreditGradeMember
4622 Type of measurement of expected credit losses [axis] Axis ifrs-full:TypeOfMeasurementOfExpectedCreditLossesAxis
4623 Type of measurement of expected credit losses [member] Member ifrs-full:TypeOfMeasurementOfExpectedCreditLossesMember
4624 Stage 1: 12-month expected credit losses [member] Member ifrs-full:TwelvemonthExpectedCreditLossesMember
4625 Stage 2: Lifetime expected credit losses [member] Member ifrs-full:LifetimeExpectedCreditLossesMember
4626 Stage 3: Lifetime Expected Credit Losses [member] Member ing:StageThreeLifetimeExpectedCreditLossesMember
4627 Initially applied IFRSs [axis] Axis ifrs-full:InitiallyAppliedIFRSsAxis
4628 Initially applied IFRSs [member] Member ifrs-full:InitiallyAppliedIFRSsMember
4629 In accordance with IFRS 9 [member] Member ifrs-full:InAccordanceWithIFRS9Member
4630 Disclosure of credit risk exposure [line items] LineItems ifrs-full:DisclosureOfCreditRiskExposureLineItems
4631 Outstanding amount in portfolio Concept (Monetary) As Of ifrs-full:MaximumExposureToCreditRisk
4632 Allowance To Mitigate Maximum Credit Exposure Concept (Monetary) As Of Credit ing:AllowanceToMitigateMaximumCreditExposure
4633 046046 - Disclosure - Risk Management Section - Sensitivity Analysis (Details) Network

*

*

 http://www.ing.com/role/RiskManagementSectionSensitivityAnalysisDetails
4634 Disclosure of nature and extent of risks arising from financial instruments [table] Table

*

*

 ifrs-full:DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable
4635 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
4636 Risks [member] Member ifrs-full:TypesOfRisksMember
4637 Credit risk [member] Member ifrs-full:CreditRiskMember
4638 Upside [Member] Member ing:UpsideMember
4639 Baseline [Member] Member ing:BaselineMember
4640 Downside [Member] Member ing:DownsideMember
4641 Geographical [Axis] Axis srt:StatementGeographicalAxis
4642 Geographical [Domain] Member srt:SegmentGeographicalDomain
4643 Netherlands [member] Member country:NL
4644 Germany [member] Member country:DE
4645 Belgium [member] Member country:BE
4646 United States [member] Member country:US
4647 Maturity [axis] Axis ifrs-full:MaturityAxis
4648 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
4649 2019 [member] Member ifrs-full:NotLaterThanOneYearMember
4650 2020 [member] Member ifrs-full:LaterThanOneYearAndNotLaterThanTwoYearsMember
4651 2021 [member] Member ifrs-full:LaterThanTwoYearsAndNotLaterThanThreeYearsMember
4652 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
4653 Carrying amount [member] Member ifrs-full:CarryingAmountMember
4654 Un-weigthed ECL Member ifrs-full:GrossCarryingAmountMember
4655 Reportable ECL Member ifrs-full:AccumulatedImpairmentMember
4656 Method of assessment of expected credit losses [axis] Axis ifrs-full:MethodOfAssessmentOfExpectedCreditLossesAxis
4657 Method of assessment of expected credit losses [member] Member ifrs-full:MethodOfAssessmentOfExpectedCreditLossesMember
4658 Real GDP Member ing:GrossDomesticProductEconomicVariableMember
4659 Unemployment Member ing:UnemploymentEconomicCoreVariableMember
4660 HPI Member ing:HousePriceIndexEconomicCoreVariableMember
4661 Disclosure of nature and extent of risks arising from financial instruments [line items] LineItems ifrs-full:DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems
4662 Scenario probability weighting Concept (Pure) As Of ing:ScenarioProbabilityWeighting
4663 Financial assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
4664 046050 - Disclosure - Risk Management Section - ING bank portfolio - Summary Forborne Assets (Detail) Network

*

*

 http://www.ing.com/role/RiskManagementSectionINGBankPortfolioSummaryForborneAssetsDetail
4665 Financial assets provisions [table] Table

*

*

 ing:FinancialAssetsProvisionsTable
4666 Internal credit grades [axis] Axis ifrs-full:InternalCreditGradesAxis
4667 Entity's total for internal credit grades [member] Member ifrs-full:EntitysTotalForInternalCreditGradesMember
4668 Performing [member] Member ing:PerformingMember
4669 Non-performing [member] Member ing:NonperformingMember
4670 Segments [axis] Axis ifrs-full:SegmentsAxis
4671 Segments [member] Member ifrs-full:SegmentsMember
4672 Wholesale Banking [member] Member ing:WholesaleBankingMember
4673 Retail Banking [Member] Member ing:RetailBankingMember
4674 Financial assets provisions [line items] LineItems ing:FinancialAssetsProvisionsLineItems
4675 Forborne assets Concept (Monetary) As Of Debit ing:ForborneAssets
4676 % of total portfolio Concept (Percent) For Period ing:ProportionOfPortfolioPercentage
4677 046051 - Disclosure - Risk Management Section - ING bank portfolio - Summary Forborne Assets by Type (Detail) Network

*

*

 http://www.ing.com/role/RiskManagementSectionINGBankPortfolioSummaryForborneAssetsByTypeDetail
4678 Financial assets provisions [table] Table

*

*

 ing:FinancialAssetsProvisionsTable
4679 Internal credit grades [axis] Axis ifrs-full:InternalCreditGradesAxis
4680 Entity's total for internal credit grades [member] Member ifrs-full:EntitysTotalForInternalCreditGradesMember
4681 Performing [member] Member ing:PerformingMember
4682 Non-performing [member] Member ing:NonperformingMember
4683 Forebearance Type [Axis] Axis ing:ForebearanceTypeAxis
4684 Total forebearance type [Member] Member ing:TotalForebearanceTypeMember
4685 Loan modification [Member] Member ing:LoanModificationMember
4686 Refinancing [Member] Member ing:RefinancingMember
4687 Internal credit grades measurement [axis] Axis ing:InternalCreditGradesMeasurementAxis
4688 Internal credit grades trigger [member] Member ing:InternalCreditGradesTriggerMemberDomain
4689 Internal Credit Grades, Trigger 1 [Member] Member ing:InternalCreditGradesTriggerOneMember
4690 Internal Credit Grades, Trigger 2 [Member] Member ing:InternalCreditGradesTriggerTwoMember
4691 Internal Credit Grades, Trigger 3 [Member] Member ing:InternalCreditGradesTriggerThreeMember
4692 Financial assets provisions [line items] LineItems ing:FinancialAssetsProvisionsLineItems
4693 Forborne assets Concept (Monetary) As Of Debit ing:ForborneAssets
4694 % of total portfolio Concept (Percent) For Period ing:ProportionOfPortfolioPercentage
4695 046052 - Disclosure - Risk Management Section - Wholesale Banking - Forborne assets by geographical area (Detail) Network

*

*

 http://www.ing.com/role/RiskManagementSectionWholesaleBankingForborneAssetsByGeographicalAreaDetail
4696 Disclosure of financial assets [table] Table

*

*

 ifrs-full:DisclosureOfFinancialAssetsTable
4697 Internal credit grades [axis] Axis ifrs-full:InternalCreditGradesAxis
4698 Entity's total for internal credit grades [member] Member ifrs-full:EntitysTotalForInternalCreditGradesMember
4699 Performing [member] Member ing:PerformingMember
4700 Non-performing [member] Member ing:NonperformingMember
4701 Segments [axis] Axis ifrs-full:SegmentsAxis
4702 Segments [member] Member ifrs-full:SegmentsMember
4703 Wholesale Banking [member] Member ing:WholesaleBankingMember
4704 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
4705 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
4706 Netherlands [member] Member country:NL
4707 Belgium [member] Member country:BE
4708 Germany [member] Member country:DE
4709 Rest of Europe [Member] Member ing:RestOfEuropeMember
4710 Africa [Member] Member srt:AfricaMember
4711 America [member] Member ing:AmericaMember
4712 Asia [Member] Member srt:AsiaMember
4713 Australia [member] Member country:AU
4714 Disclosure of financial assets [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsLineItems
4715 Forborne assets Concept (Monetary) As Of Debit ing:ForborneAssets
4716 046053 - Disclosure - Risk Management Section - Wholesale Banking -Forborne assets by economic sector (Detail) Network

*

*

 http://www.ing.com/role/RiskManagementSectionWholesaleBankingForborneAssetsByEconomicSectorDetail
4717 Disclosure of financial assets [table] Table

*

*

 ifrs-full:DisclosureOfFinancialAssetsTable
4718 Internal credit grades [axis] Axis ifrs-full:InternalCreditGradesAxis
4719 Entity's total for internal credit grades [member] Member ifrs-full:EntitysTotalForInternalCreditGradesMember
4720 Performing [member] Member ing:PerformingMember
4721 Non-performing [member] Member ing:NonperformingMember
4722 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
4723 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
4724 Segments [axis] Axis ifrs-full:SegmentsAxis
4725 Segments [member] Member ifrs-full:SegmentsMember
4726 Wholesale Banking [member] Member ing:WholesaleBankingMember
4727 Markets of customers [axis] Axis ifrs-full:MarketsOfCustomersAxis
4728 Markets Of Customers [Member] Member ifrs-full:MarketsOfCustomersMember
4729 Natural resources [Member] Member ing:NaturalResourcesMember
4730 Real estate [member] Member ing:RealEstate1Member
4731 Transportation & Logistics [member] Member ing:TransportationAndLogisticsMember
4732 Builders & Contractors [Member] Member ing:BuildersAndContractorsMember
4733 General Industries [Member] Member ing:GeneralIndustriesMember
4734 Services [Member] Member ing:ServicesMember
4735 Food, Beverages & Personal Care [member] Member ing:FoodBeveragesPersonalCareMember
4736 Utilities [member] Member ing:UtilitiesMember
4737 Retail [member] Member us-gaap:RetailMember
4738 Chemicals, Health & Pharmaceuticals [Member] Member ing:ChemicalsHealthAndPharmaceuticalsMember
4739 Non-Bank Financial Institutions [member] Member ing:NonbankFinancialInstitutionsMember
4740 Telecom [Member] Member ing:TelecomsMember
4741 Other [member] Member ing:OtherMember
4742 Disclosure of financial assets [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsLineItems
4743 Forborne assets Concept (Monetary) As Of Debit ing:ForborneAssets
4744 046055 - Disclosure - Risk Management Section - Retail Forborne Assets by Geographical Area (Detail) Network

*

*

 http://www.ing.com/role/RiskManagementSectionRetailForborneAssetsByGeographicalAreaDetail
4745 Disclosure of financial assets [table] Table

*

*

 ifrs-full:DisclosureOfFinancialAssetsTable
4746 Internal credit grades [axis] Axis ifrs-full:InternalCreditGradesAxis
4747 Entity's total for internal credit grades [member] Member ifrs-full:EntitysTotalForInternalCreditGradesMember
4748 Performing Exposure [Member] Member ing:PerformingExposureMember
4749 Non-performing exposure [member] Member ing:NonperformingExposureMember
4750 Segments [axis] Axis ifrs-full:SegmentsAxis
4751 Segments [member] Member ifrs-full:SegmentsMember
4752 Retail Banking [Member] Member ing:RetailBankingMember
4753 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
4754 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
4755 Netherlands [member] Member country:NL
4756 Belgium [member] Member country:BE
4757 Germany [member] Member country:DE
4758 Rest of Europe [Member] Member ing:RestOfEuropeMember
4759 Africa [Member] Member srt:AfricaMember
4760 America [member] Member ing:AmericaMember
4761 Asia [Member] Member srt:AsiaMember
4762 Australia [member] Member country:AU
4763 Disclosure of financial assets [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsLineItems
4764 Forborne assets Concept (Monetary) As Of Debit ing:ForborneAssets
4765 046060 - Disclosure - Risk Management Section - NII-at-Risk banking books per business - year 1 (Detail) Network

*

*

 http://www.ing.com/role/RiskManagementSectionNIIatRiskBankingBooksPerBusinessYear1Detail
4766 Net Interest Income at Risk [Table] Table

*

*

 ing:NetInterestIncomeAtRiskTable
4767 Segments [axis] Axis ifrs-full:SegmentsAxis
4768 Segments [member] Member ifrs-full:SegmentsMember
4769 Wholesale Banking [member] Member ing:WholesaleBankingMember
4770 Retail Banking [Member] Member ing:RetailBankingMember
4771 Retail Challengers & Growth Markets [member] Member ing:RetailChallengersAndGrowthMarketsMember
4772 Corporate Line Banking [member] Member ing:CorporateLineBankingMember
4773 Types of interest rates [axis] Axis ifrs-full:TypesOfInterestRatesAxis
4774 Interest rate types [member] Member ifrs-full:InterestRateTypesMember
4775 Ramped Unfloored Parallel Downward [Member] Member ing:RampedUnflooredParallelDownwardMember
4776 Ramped Unfloored Parallel Upward [Member] Member ing:RampedUnflooredParallelUpwardMember
4777 Instantaneous Floored Parallel Downward [Member] Member ing:InstantaneousFlooredParallelDownwardMember
4778 Instantaneous Floored +100 bps [Member] Member ing:InstantaneousFlooredPlusHundredBpsMember
4779 Net Interest Income at Risk [Line Items] LineItems ing:NetInterestIncomeAtRiskLineItems
4780 NII-At -Risk Concept (Monetary) For Period Credit ing:NetInterestIncomeAtRisk
4781 046061 - Disclosure - Risk Management Section - NII-at-Risk banking book per currency - year 1 (Detail) Network

*

*

 http://www.ing.com/role/RiskManagementSectionNIIatRiskBankingBookPerCurrencyYear1Detail
4782 Net Interest Income at Risk [Table] Table

*

*

 ing:NetInterestIncomeAtRiskTable
4783 Types of interest rates [axis] Axis ifrs-full:TypesOfInterestRatesAxis
4784 Interest rate types [member] Member ifrs-full:InterestRateTypesMember
4785 Instantaneous Floored Parallel Downward [Member] Member ing:InstantaneousFlooredParallelDownwardMember
4786 Instantaneous Floored +100 bps [Member] Member ing:InstantaneousFlooredPlusHundredBpsMember
4787 Ramped Unfloored Parallel Downward [Member] Member ing:RampedUnflooredParallelDownwardMember
4788 Ramped Unfloored Parallel Upward [Member] Member ing:RampedUnflooredParallelUpwardMember
4789 Currency [Axis] Axis srt:CurrencyAxis
4790 All Currencies [Domain] Member currency:AllCurrenciesDomain
4791 Euro Member currency:EUR
4792 US Dollar Member currency:USD
4793 Other currency Member ing:OtherCurrencyMember
4794 Net Interest Income at Risk [Line Items] LineItems ing:NetInterestIncomeAtRiskLineItems
4795 NII-At -Risk Concept (Monetary) For Period Credit ing:NetInterestIncomeAtRisk
4796 046062 - Disclosure - Risk Management Section - NPV-at-Risk banking books per business (Detail) Network

*

*

 http://www.ing.com/role/RiskManagementSectionNPVatRiskBankingBooksPerBusinessDetail
4797 Net Present Value At Risk [Table] Table

*

*

 ing:NetPresentValueAtRiskTable
4798 Types of interest rates [axis] Axis ifrs-full:TypesOfInterestRatesAxis
4799 Interest rate types [member] Member ifrs-full:InterestRateTypesMember
4800 Unfloored Parallel Downward [Member] Member ing:UnflooredParallelDownwardMember
4801 Unfloored Parallel Upward [Member] Member ing:UnflooredParallelUpwardMember
4802 Floored Parallel Downward [member] Member ing:FlooredParallelDownwardMember
4803 Floored Plus Hundred Bps [Member] Member ing:FlooredPlusHundredBpsMember
4804 Segments [axis] Axis ifrs-full:SegmentsAxis
4805 Segments [member] Member ifrs-full:SegmentsMember
4806 Wholesale Banking [member] Member ing:WholesaleBankingMember
4807 Retail Banking [Member] Member ing:RetailBankingMember
4808 Retail Challengers & Growth Markets [member] Member ing:RetailChallengersAndGrowthMarketsMember
4809 Corporate Line Banking [member] Member ing:CorporateLineBankingMember
4810 Net Present Value At Risk [Line Items] LineItems ing:NetPresentValueAtRiskLineItems
4811 NPV-at-Risk Concept (Monetary) For Period Credit ing:NetPresentValueAtRisk
4812 046063 - Disclosure - Risk Management Section - NPV-at-Risk banking books per accounting category (Detail) Network

*

*

 http://www.ing.com/role/RiskManagementSectionNPVatRiskBankingBooksPerAccountingCategoryDetail
4813 Net Present Value At Risk [Table] Table

*

*

 ing:NetPresentValueAtRiskTable
4814 Types of interest rates [axis] Axis ifrs-full:TypesOfInterestRatesAxis
4815 Interest rate types [member] Member ifrs-full:InterestRateTypesMember
4816 Unfloored Parallel Downward [Member] Member ing:UnflooredParallelDownwardMember
4817 Unfloored Parallel Upward [Member] Member ing:UnflooredParallelUpwardMember
4818 Floored Parallel Downward [member] Member ing:FlooredParallelDownwardMember
4819 Floored Plus Hundred Bps [Member] Member ing:FlooredPlusHundredBpsMember
4820 Measurement [axis] Axis ifrs-full:MeasurementAxis
4821 Aggregated measurement [member] Member ifrs-full:AggregatedMeasurementMember
4822 Amortised Costs [Member] Member ing:AmortisedCostsMember
4823 Available for sale [member] Member ing:AvailableForSaleMember
4824 Fair Value Through Profit Or Loss [member] Member ing:FairValueThroughProfitOrLossMember
4825 Net Present Value At Risk [Line Items] LineItems ing:NetPresentValueAtRiskLineItems
4826 NPV-at-Risk Concept (Monetary) For Period Credit ing:NetPresentValueAtRisk
4827 046064 - Disclosure - Risk Management Section - BPV banking books per currency (Detail) Network

*

*

 http://www.ing.com/role/RiskManagementSectionBPVBankingBooksPerCurrencyDetail
4828 Basis point value [table] Table

*

*

 ing:BasisPointValueTable
4829 Currency [Axis] Axis srt:CurrencyAxis
4830 All Currencies [Domain] Member currency:AllCurrenciesDomain
4831 Euro Member currency:EUR
4832 US Dollar Member currency:USD
4833 Other currency Member ing:OtherCurrencyMember
4834 Trading income (expense) [line items] LineItems ing:TradingIncomeExpenseLineItems
4835 Basis point value (BPV) Concept (Monetary) For Period Debit ing:BasisPointValuePerCurrency
4836 046065 - Disclosure - Risk Management Section - Net banking currency exposures banking books (Detail) Network

*

*

 http://www.ing.com/role/RiskManagementSectionNetBankingCurrencyExposuresBankingBooksDetail
4837 Basis point value [table] Table

*

*

 ing:BasisPointValueTable
4838 Investment Sector [Axis] Axis invest:InvestmentSectorAxis
4839 Investment Sector [Domain] Member invest:InvestmentSectorDomain
4840 Foreign investments [Member] Member ing:ForeignInvestmentsMember
4841 Hedges [Member] Member ing:HedgesMember
4842 Currency [Axis] Axis srt:CurrencyAxis
4843 All Currencies [Domain] Member currency:AllCurrenciesDomain
4844 US Dollar Member currency:USD
4845 Pound Sterling Member currency:GBP
4846 Polish Zloty Member currency:PLN
4847 Australian Dollar Member currency:AUD
4848 Turkish Lira Member currency:TRY
4849 Chinese Yuan Member currency:CNY
4850 South Korean Won Member currency:KRW
4851 Indian Rupee Member currency:INR
4852 Brazilian Real Member currency:BRL
4853 Russian Rouble Member currency:RUB
4854 Other currency Member ing:OtherCurrencyMember
4855 Trading income (expense) [line items] LineItems ing:TradingIncomeExpenseLineItems
4856 Net banking currency exposures banking books Concept (Monetary) For Period Credit ing:IncreaseDecreaseInNetDebtThroughForeignCurrencyExchangeExposures
4857 046066 - Disclosure - Risk Management Section - Equities Unrealised Gains and Losses in the AFS portfolio (Detail) Network

*

*

 http://www.ing.com/role/RiskManagementSectionEquitiesUnrealisedGainsAndLossesInTheAFSPortfolioDetail
4858 Unrealised gain losses on securities [table] Table

*

*

 ing:UnrealisedGainLossesOnSecuritiesTable
4859 Categories of financial assets [axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
4860 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
4861 Financial assets at fair value through other comprehensive income, category [member] Member ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember
4862 Initially applied IFRSs [axis] Axis ifrs-full:InitiallyAppliedIFRSsAxis
4863 Initially applied IFRSs [member] Member ifrs-full:InitiallyAppliedIFRSsMember
4864 In accordance with IFRS 9 [member] Member ifrs-full:InAccordanceWithIFRS9Member
4865 Unrealised gain losses on securities [line items] LineItems ing:UnrealisedGainLossesOnSecuritiesLineItems
4866 Gross unrealised gains Concept (Monetary) For Period Credit ing:UnrealizedGainOnAvailableForSaleSecurities
4867 Gross unrealised losses Concept (Monetary) For Period Debit ing:UnrealizedLossOnAvailableForSaleSecurities
4868 Total Concept (Monetary) For Period Credit ing:UnrealisedGainLossesOnSecuritiesAvailableForSale
4869 046067 - Disclosure - Risk Management Section - Real Estate market risk exposure in banking books (by geographic area and sector type (Detail) Network

*

*

 http://www.ing.com/role/RiskManagementSectionRealEstateMarketRiskExposureInBankingBooksbyGeographicAreaAndSectorTypeDetail
4870 Real estate market risk [table] Table

*

*

 ing:RealEstateMarketRiskTable
4871 Entity Sector Industry Classifications, Sector [Axis] Axis dei:EntitySectorIndustryClassificationsSectorAxis
4872 Sector [Domain] Member dei:SectorDomain
4873 Residential [Member] Member ing:ResidentialMember
4874 Office [member] Member ing:OfficeMember
4875 Retail [member] Member us-gaap:RetailMember
4876 Industrial [member] Member ing:IndustrialMember
4877 Other sectors [Member] Member ing:OtherSectorsMember
4878 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
4879 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
4880 Europe [member] Member srt:EuropeMember
4881 Americas [Member] Member srt:AmericasMember
4882 Australia [member] Member country:AU
4883 Asia [Member] Member srt:AsiaMember
4884 Other continental [member] Member ing:OtherContinentalMember
4885 Scenario [Axis] Axis us-gaap:StatementScenarioAxis
4886 Scenario, Unspecified [Domain] Member us-gaap:ScenarioUnspecifiedDomain
4887 Scenario, Previously Reported [Member] Member srt:ScenarioPreviouslyReportedMember
4888 Real estate market risk [line items] LineItems ing:RealEstateMarketRiskLineItems
4889 Real Estate market risk exposure Concept (Monetary) As Of Debit ing:RealEstateMarketRisk
4890 046068 - Disclosure - Risk Management Section - VaR for Internal Model Approach trading portfolios (Detail) Network

*

*

 http://www.ing.com/role/RiskManagementSectionVaRForInternalModelApproachTradingPortfoliosDetail
4891 Disclosure of Value at Risk historical simulation [table] Table

*

*

 ing:DisclosureOfValueAtRiskHistoricalSimulationTable
4892 Range [axis] Axis ifrs-full:RangeAxis
4893 Ranges [member] Member ifrs-full:RangesMember
4894 Minimum [member] Member ifrs-full:BottomOfRangeMember
4895 Maximum [member] Member ifrs-full:TopOfRangeMember
4896 Average [member] Member ifrs-full:WeightedAverageMember
4897 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
4898 Risks [member] Member ifrs-full:TypesOfRisksMember
4899 Interest rate risk [member] Member ifrs-full:InterestRateRiskMember
4900 Equity price risk [member] Member ifrs-full:EquityPriceRiskMember
4901 Foreign exchange risk [member] Member ing:ForeignExchangeRiskMember
4902 Credit risk [member] Member ifrs-full:CreditRiskMember
4903 Risk diversification effect [member] Member ifrs-full:RiskDiversificationEffectMember
4904 Disclosure of Value at Risk historical simulation [Line Items] LineItems ing:DisclosureOfValueAtRiskHistoricalSimulationLineItems
4905 value at risk Concept (Monetary) As Of ifrs-full:ValueAtRisk
4906 046069 - Disclosure - Risk Management Section - EU MR3: Internal Model Approach values for trading portfolios (Detail) Network

*

*

 http://www.ing.com/role/RiskManagementSectionEUMR3InternalModelApproachValuesForTradingPortfoliosDetail
4907 Disclosure of Value at Risk historical simulation [table] Table

*

*

 ing:DisclosureOfValueAtRiskHistoricalSimulationTable
4908 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
4909 Risks [member] Member ifrs-full:TypesOfRisksMember
4910 VaR (10 day 99%) [member] Member ing:ValueAtRiskTenDaysNinetyNineMember
4911 Stressed VaR (10 day 99%) [member] Member ing:StressedValueAtRiskTenDaysNinetyNineMember
4912 Incremental Risk Charge (99.9%) [member] Member ing:IncrementalRiskChargeNinetyNinePointNineNineMember
4913 Comprehensive Risk capital charge (99.9%) [member] Member ing:ComprehensiveRiskCapitalChargeNinetyNinePointNineNineMember
4914 Range [axis] Axis ifrs-full:RangeAxis
4915 Ranges [member] Member ifrs-full:RangesMember
4916 Maximum [member] Member ifrs-full:TopOfRangeMember
4917 Average [member] Member ifrs-full:WeightedAverageMember
4918 Minimum [member] Member ifrs-full:BottomOfRangeMember
4919 Disclosure of Value at Risk historical simulation [Line Items] LineItems ing:DisclosureOfValueAtRiskHistoricalSimulationLineItems
4920 value at risk Concept (Monetary) As Of ifrs-full:ValueAtRisk
4921 046070 - Disclosure - Risk Management Section - EU MR1: Market risk under Standardised Approach (Detail) Network

*

*

 http://www.ing.com/role/RiskManagementSectionEUMR1MarketRiskUnderStandardisedApproachDetail
4922 Market Risk [Table] Table

*

*

 ing:MarketRiskTable
4923 Internal credit grades [axis] Axis ifrs-full:InternalCreditGradesAxis
4924 Entity's total for internal credit grades [member] Member ifrs-full:EntitysTotalForInternalCreditGradesMember
4925 Standardised approach (SA) [member] Member ing:StandardisedCreditRatingApproachSAMember
4926 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
4927 Risks [member] Member ifrs-full:TypesOfRisksMember
4928 Foreign exchange risk [member] Member ing:ForeignExchangeRiskMember
4929 Market Risk [Line Items] LineItems ing:MarketRiskLineItems
4930 RWA Concept (Monetary) As Of Debit ing:RiskWeightedAssets1
4931 Capital requirements Concept (Monetary) As Of Debit ing:CapitalRequirements
4932 046071 - Disclosure - Risk Management Section - EU MR2-A: Market risk under Internal Model Approach (Detail) Network

*

*

 http://www.ing.com/role/RiskManagementSectionEUMR2AMarketRiskUnderInternalModelApproachDetail
4933 Market Risk [Table] Table

*

*

 ing:MarketRiskTable
4934 Internal credit grades [axis] Axis ifrs-full:InternalCreditGradesAxis
4935 Entity's total for internal credit grades [member] Member ifrs-full:EntitysTotalForInternalCreditGradesMember
4936 Advanced Internal Rating Based (AIRB) [member] Member ing:AdvancedInternalRatingBasedAIRBMember
4937 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
4938 Risks [member] Member ifrs-full:TypesOfRisksMember
4939 VaR (higher of values a and b) [member] Member ing:ValueAtRiskMember
4940 SVaR (higher of values a and b) [member] Member ing:StressedValueAtRiskMember
4941 Incremental risk charge -IRC (higher of values a and b) [member] Member ing:IncrementalRiskChargeMember
4942 Comprehensive Risk Measure - CRM (higher of values a, b and c) [member] Member ing:ComprehensiveRiskMeasureMember
4943 Valuation techniques used in fair value measurement [axis] Axis ifrs-full:ValuationTechniquesUsedInFairValueMeasurementAxis
4944 Valuation techniques [member] Member ifrs-full:ValuationTechniquesMember
4945 VaR (a) [member] Member ing:ValueAtRisk1Member
4946 VaR (b) [member] Member ing:ValueAtRisk2Member
4947 SVaR (a) [member] Member ing:StressedValueAtRisk1Member
4948 SVaR (b) [member] Member ing:StressedValueAtRisk2Member
4949 Incremental risk charge -IRC (a) [member] Member ing:IncrementalRiskCharge1Member
4950 Incremental risk charge -IRC (a) [member] Member ing:IncrementalRiskCharge2Member
4951 Comprehensive Risk Measure - CRM (a) [member] Member ing:ComprehensiveRiskMeasure1Member
4952 Comprehensive Risk Measure - CRM (b) [member] Member ing:ComprehensiveRiskMeasure2Member
4953 Comprehensive Risk Measure - CRM (c) [member] Member ing:ComprehensiveRiskMeasure3Member
4954 Market Risk [Line Items] LineItems ing:MarketRiskLineItems
4955 Risk measure Concept (Text/String) For Period ing:DescriptionOfMarketRiskExposure
4956 RWA Concept (Monetary) As Of Debit ing:RiskWeightedAssets1
4957 Capital requirements Concept (Monetary) As Of Debit ing:CapitalRequirements
4958 046072 - Disclosure - Risk Management Section - Most important foreign exchange year-end trading positions (Detail) Network

*

*

 http://www.ing.com/role/RiskManagementSectionMostImportantForeignExchangeYearendTradingPositionsDetail
4959 Market Risk [Table] Table

*

*

 ing:MarketRiskTable
4960 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
4961 Risks [member] Member ifrs-full:TypesOfRisksMember
4962 Foreign exchange risk [member] Member ing:ForeignExchangeRiskMember
4963 Currency [Axis] Axis srt:CurrencyAxis
4964 All Currencies [Domain] Member currency:AllCurrenciesDomain
4965 US Dollar Member currency:USD
4966 Romanian New Leu Member currency:RON
4967 Chinese Yuan Member currency:CNY
4968 Swiss Francs Member currency:CHF
4969 South Korean Won Member currency:KRW
4970 Czech Koruna Member currency:CZK
4971 Polish Zloty Member currency:PLN
4972 Japan, Yen Member currency:JPY
4973 Taiwan, New Dollars Member currency:TWD
4974 Market Risk [Line Items] LineItems ing:MarketRiskLineItems
4975 Sensitivities at year-end Concept (Monetary) As Of Credit ing:MarketRiskCapital
4976 046073 - Disclosure - Risk Management Section - Most important interest rate and credit spread sensitivities at year-end (Detail) Network

*

*

 http://www.ing.com/role/RiskManagementSectionMostImportantInterestRateAndCreditSpreadSensitivitiesAtYearendDetail
4977 Market Risk [Table] Table

*

*

 ing:MarketRiskTable
4978 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
4979 Risks [member] Member ifrs-full:TypesOfRisksMember
4980 Interest rate risk [member] Member ifrs-full:InterestRateRiskMember
4981 Credit spread (BPS) [member] Member ing:CreditSpreadMember
4982 Entity Sector Industry Classifications, Sector [Axis] Axis dei:EntitySectorIndustryClassificationsSectorAxis
4983 Sector [Domain] Member dei:SectorDomain
4984 Corporate Segment [Member] Member us-gaap:CorporateMember
4985 Financial institutions [Member] Member ing:FinancialInstitutionsMember
4986 External credit grades [axis] Axis ifrs-full:ExternalCreditGradesAxis
4987 Entity's total for external credit grades [member] Member ifrs-full:EntitysTotalForExternalCreditGradesMember
4988 1 (AAA) [member] Member ing:GradeOneMember
4989 2-4 (AA) [member] Member ing:GradeTwoMember
4990 5-7 (A) [member] Member ing:InternalCreditGradeThreeMember
4991 8-10 (BBB) [member] Member ing:InternalCreditGradeFourMember
4992 11-13 (BB) [member] Member ing:InternalCreditGradeFiveMember
4993 14-16 (B) [member] Member ing:InternalGradeSixMember
4994 17-22 (CCC and NPL) [member] Member ing:InternalGradeSevenMember
4995 Not rated [member] Member ing:AssetsNotRatedMember
4996 Currency [Axis] Axis srt:CurrencyAxis
4997 All Currencies [Domain] Member currency:AllCurrenciesDomain
4998 Euro Member currency:EUR
4999 South Korean Won Member currency:KRW
5000 Polish Zloty Member currency:PLN
5001 Indian Rupee Member currency:INR
5002 United Kingdom, Pounds Member currency:GBP
5003 Romanian New Leu Member currency:RON
5004 US Dollar Member currency:USD
5005 Russian Rouble Member currency:RUB
5006 Japan, Yen Member currency:JPY
5007 Taiwan, New Dollars Member currency:TWD
5008 Geographical [Axis] Axis srt:StatementGeographicalAxis
5009 Geographical [Domain] Member srt:SegmentGeographicalDomain
5010 United States [member] Member country:US
5011 Germany [member] Member country:DE
5012 Belgium [member] Member country:BE
5013 India [member] Member country:IN
5014 Poland [member] Member country:PL
5015 Supranational [Member] Member ing:SupranationalMember
5016 France [member] Member country:FR
5017 Netherlands [member] Member country:NL
5018 United Kingdom [member] Member country:GB
5019 Russian Federation [member] Member country:RU
5020 Market Risk [Line Items] LineItems ing:MarketRiskLineItems
5021 Sensitivities at year-end Concept (Monetary) As Of Credit ing:MarketRiskCapital
5022 Credit spread sensitivities per risk class and sector at year-end Concept (Text/String) For Period ing:ChangeInPriceEstimationUnderSensitivityAnalysis
5023 046074 - Disclosure - Risk management section - ING Bank Funding Mix (Detail) Network

*

*

 http://www.ing.com/role/RiskManagementSectionINGBankFundingMixDetail
5024 Disclosure of financial liabilities [table] Table

*

*

 ifrs-full:DisclosureOfFinancialLiabilitiesTable
5025 Categories of financial liabilities [axis] Axis ifrs-full:CategoriesOfFinancialLiabilitiesAxis
5026 Financial liabilities, category [member] Member ifrs-full:FinancialLiabilitiesCategoryMember
5027 Retail deposits [member] Member ing:RetailDepositsMember
5028 Corporate & other deposits [member] Member ing:CorporateAndOtherDepositsMember
5029 Lending/repurchase agreement [member] Member ing:LendingOrRepurchaseAgreementMember
5030 Interbank (incl. central bank) [member] Member ing:InterbankDepositsMember
5031 CD CP [Member] Member ing:CdCpMember
5032 Long-term Public debt [member] Member ing:PublicDebtMember
5033 Subordinated debt [member] Member us-gaap:SubordinatedDebtMember
5034 Disclosure of financial liabilities [line items] LineItems ifrs-full:DisclosureOfFinancialLiabilitiesLineItems
5035 Funding type Concept (Percent) As Of ing:PercentageOfFundingMix
5036 046085 - Disclosure - Risk Management Section - Schedule of Exposure classes: ING Bank Portfolio Per Risk Category - Additional Information (Detail) Network

*

*

 http://www.ing.com/role/RiskManagementSectionScheduleOfExposureClassesINGBankPortfolioPerRiskCategoryAdditionalInformationDetail
5037 Disclosure of credit risk exposure [table] Table

*

*

 ifrs-full:DisclosureOfCreditRiskExposureTable
5038 Currency [Axis] Axis srt:CurrencyAxis
5039 All Currencies [Domain] Member currency:AllCurrenciesDomain
5040 US Dollar Member currency:USD
5041 Australian Dollar Member currency:AUD
5042 Turkey, New Lira Member currency:TRY
5043 Poland, Zlotych Member currency:PLN
5044 Internal credit grades [axis] Axis ifrs-full:InternalCreditGradesAxis
5045 Entity's total for internal credit grades [member] Member ifrs-full:EntitysTotalForInternalCreditGradesMember
5046 Investment grade [member] Member ing:InvestmentGradeMember
5047 Non-investment grade [member] Member ing:NoninvestmentGradeWholesaleMember
5048 Substandard grade [member] Member ing:SubstandardGradeMember
5049 Non-performing grade [member] Member ing:NonperformingGradeMember
5050 Internal credit grade Member ifrs-full:InternalCreditGradesMember
5051 External credit grades [axis] Axis ifrs-full:ExternalCreditGradesAxis
5052 Entity's total for external credit grades [member] Member ifrs-full:EntitysTotalForExternalCreditGradesMember
5053 AAA credit Grades [Member] Member ing:AAAccreditGradesMember
5054 Segments [axis] Axis ifrs-full:SegmentsAxis
5055 Segments [member] Member ifrs-full:SegmentsMember
5056 Wholesale and coporate line Banking [Member] Member ing:WholesaleAndCoporateLineBankingMember
5057 Retail Benelux [member] Member ing:RetailBeneluxMember
5058 Retail Netherlands [Member] Member ing:RetailNetherlandsMember
5059 Retail Challengers & Growth Markets [member] Member ing:RetailChallengersAndGrowthMarketsMember
5060 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
5061 Risks [member] Member ifrs-full:TypesOfRisksMember
5062 Lending [Member] Member ing:LendingMember
5063 Investments [member] Member ing:InvestmentMember
5064 Money Market Funds 1 [Member] Member ing:MoneyMarketFunds1Member
5065 Pre-settlement [member] Member ing:Presettlement1Member
5066 Geographical [Axis] Axis srt:StatementGeographicalAxis
5067 Geographical [Domain] Member srt:SegmentGeographicalDomain
5068 Poland [member] Member country:PL
5069 Spain [member] Member country:ES
5070 United Kingdom [member] Member country:GB
5071 Luxembourg [member] Member country:LU
5072 Italy [member] Member country:IT
5073 Disclosure of credit risk exposure [line items] LineItems ifrs-full:DisclosureOfCreditRiskExposureLineItems
5074 Percentage of decrease in portfolio size Concept (Percent) For Period ing:PercentageOfDecreaseInPortfolioSize
5075 Percentage of increase in portfolio size Concept (Percent) For Period ing:PercentageOfIncreaseInPortfolioSize
5076 Increase (decrease) in portfolio size Concept (Monetary) For Period Credit ing:IncreaseDecreaseInPortfolioSize
5077 Outstanding amount in portfolio Concept (Monetary) As Of ifrs-full:MaximumExposureToCreditRisk
5078 Appreciation in currency value Concept (Percent) For Period ing:AppreciationInCurrencyValue
5079 Depreciation in currency value Concept (Percent) For Period ing:DepreciationInCurrencyValue
5080 Rating class concentration increase or (decrease) percentage Concept (Percent) For Period ing:RatingClassConcentrationPercentageIncreaseDecrease
5081 046087 - Disclosure - Risk Management Section - (Country Risk) ING bank portfolio - Additional Information (Detail) Network

*

*

 http://www.ing.com/role/RiskManagementSectionCountryRiskINGBankPortfolioAdditionalInformationDetail
5082 Financial assets provisions [table] Table

*

*

 ing:FinancialAssetsProvisionsTable
5083 Range [axis] Axis ifrs-full:RangeAxis
5084 Ranges [member] Member ifrs-full:RangesMember
5085 Minimum [member] Member ifrs-full:BottomOfRangeMember
5086 Maximum [member] Member ifrs-full:TopOfRangeMember
5087 Probability of default [axis] Axis ifrs-full:ProbabilityOfDefaultAxis
5088 Entity's total for probability of default [member] Member ifrs-full:EntitysTotalForProbabilityOfDefaultMember
5089 No cover [member] Member ing:NoCoverMember
5090 Greater than zero percentage to twenty five percentage [member] Member ing:GreaterThanZeroPercentageToTwentyFivePercentageMember
5091 Greater than twenty five percentage to fifty percentage [member] Member ing:GreaterThanTwentyFivePercentageToFiftyPercentageMember
5092 Greater than fifty percentage to seventy five percentage [member] Member ing:GreaterThanFiftyPercentageToSeventyFivePercentageMember
5093 Greater than seventy five percentage to less than hundred percentage [member] Member ing:GreaterThanSeventyFivePercentageToLessThanHundredPercentageMember
5094 Less thanequal to hundred percentage [member] Member ing:LessThanequalToHundredPercentageMember
5095 Non-adjusting events after reporting period [axis] Axis ifrs-full:NonadjustingEventsAfterReportingPeriodAxis
5096 Non-adjusting events after reporting period [member] Member ifrs-full:NonadjustingEventsMember
5097 Events After Reporting Period [Member] Member ing:EventsAfterReportingPeriodMember
5098 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
5099 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
5100 Business Lending [member] Member ing:BusinessLendingMember
5101 Commercial Banks [member] Member ing:CommercialBanksMember
5102 Methods of generation [axis] Axis ifrs-full:MethodsOfGenerationAxis
5103 Methods of generation [member] Member ifrs-full:MethodsOfGenerationMember
5104 Consumer Lending [member] Member ing:ConsumerLendingMember
5105 Geographical [Axis] Axis srt:StatementGeographicalAxis
5106 Geographical [Domain] Member srt:SegmentGeographicalDomain
5107 Netherlands [member] Member country:NL
5108 Germany [member] Member country:DE
5109 Belgium And Luxembourg [Member] Member ing:BelgiumAndLuxembourgMember
5110 Australia [member] Member country:AU
5111 Rest of Europe [Member] Member ing:RestOfEuropeMember
5112 Mortgage Loans on Real Estate, Loan Type [Axis] Axis srt:MortgageLoansOnRealEstateLoanTypeAxis
5113 Mortgage Loans on Real Estate, Loan Type [Domain] Member srt:MortgageLoansOnRealEstateLoanTypeDomain
5114 Residential Mortgages (Private Individuals) [Member] Member ing:ResidentialMortgageLoansMember
5115 Financial assets provisions [line items] LineItems ing:FinancialAssetsProvisionsLineItems
5116 Percentage of country risk exposure covers portfolio outstanding Concept (Percent) For Period ing:PercentageOfCountryRiskExposureCoversPortfolioOutstanding
5117 Lending, investment and money market portfolio outstanding risk percentage Concept (Percent) For Period ing:LendingInvestmentAndMoneyMarketPortfolioOutstandingRiskPercentage
5118 Percentage of no portfolio close covers ratio Concept (Percent) For Period ing:PercentageOfNoPortfolioCloseCoversRatio
5119 Percentage Investment Outstandings Investment Grade Concept (Percent) For Period ing:PercentageInvestmentOutstandingsInvestmentGrade
5120 Percentage consumer lending portfolio accounts outstandings Concept (Percent) For Period ing:PercentageOfConsumerLendingPortfolioAccountsOutstandings
5121 Percentage Consumer Lending Portfolio Comprises Of Residential Mortgage Loans Concept (Percent) For Period ing:PercentageConsumerLendingPortfolioComprisesOfResidentialMortgageLoans
5122 Percentage of maximum loan to value ratio Concept (Percent) For Period ing:PercentageOfMaximumLoanToValueRatio
5123 Percentage of total outstandings Concept (Percent) For Period ing:PercentageOfNetOutstandings
5124 Increase in business lending outstanding Concept (Monetary) For Period Credit ing:IncreaseInBusinessLendingOutstandings
5125 Decrease in business lending outstanding Concept (Monetary) For Period Debit ing:DecreaseInBusinessLendingOutstandings
5126 Percentage of increase in business lending outstanding Concept (Percent) For Period ing:PercentageOfIncreaseInBusinessLendingOutstandingAmount
5127 Percentage of decrease in guarantees Concept (Percent) For Period ing:PercentageOfDecreaseInGuarantees
5128 Percentage of construction property financing Concept (Percent) For Period ing:PercentageOfConstructionPropertyFinancing
5129 046088 - Disclosure - Risk Management Section - Covers, NP Loans, Loan Loss - Additional Information (Detail) Network

*

*

 http://www.ing.com/role/RiskManagementSectionCoversNPLoansLoanLossAdditionalInformationDetail
5130 Disclosure of credit risk exposure [table] Table

*

*

 ifrs-full:DisclosureOfCreditRiskExposureTable
5131 Geographical [Axis] Axis srt:StatementGeographicalAxis
5132 Geographical [Domain] Member srt:SegmentGeographicalDomain
5133 Netherlands [member] Member country:NL
5134 Germany [member] Member country:DE
5135 Belgium [member] Member country:BE
5136 Belgium And Luxembourg [Member] Member ing:BelgiumAndLuxembourgMember
5137 Australia [member] Member country:AU
5138 Rest of Europe [Member] Member ing:RestOfEuropeMember
5139 Spain [member] Member country:ES
5140 America [member] Member ing:AmericaMember
5141 Mortgage Loans on Real Estate, Loan Type [Axis] Axis srt:MortgageLoansOnRealEstateLoanTypeAxis
5142 Mortgage Loans on Real Estate, Loan Type [Domain] Member srt:MortgageLoansOnRealEstateLoanTypeDomain
5143 Residential Mortgages (Private Individuals) [Member] Member ing:ResidentialMortgageLoansMember
5144 Markets of customers [axis] Axis ifrs-full:MarketsOfCustomersAxis
5145 Markets Of Customers [Member] Member ifrs-full:MarketsOfCustomersMember
5146 Utilities [member] Member ing:UtilitiesMember
5147 Dutch Central Bank [Member] Member ing:DutchCentralBanksMember
5148 Commercial loans [Member] Member ing:CommercialLoansMember
5149 Central Governments [member] Member ing:CentralGovernmentsMember
5150 Non-Bank Financial Institutions [member] Member ing:NonbankFinancialInstitutionsMember
5151 Commercial Banks [member] Member ing:CommercialBanksMember
5152 Impairment of financial assets [axis] Axis ifrs-full:ImpairmentOfFinancialAssetsAxis
5153 Entity's total for impairment of financial assets [member] Member ifrs-full:EntitysTotalForImpairmentOfFinancialAssetsMember
5154 Non performing Loans [member] Member ifrs-full:FinancialAssetsPastDueButNotImpairedMember
5155 Type of measurement of expected credit losses [axis] Axis ifrs-full:TypeOfMeasurementOfExpectedCreditLossesAxis
5156 Type of measurement of expected credit losses [member] Member ifrs-full:TypeOfMeasurementOfExpectedCreditLossesMember
5157 Stage 1: 12-month expected credit losses [member] Member ifrs-full:TwelvemonthExpectedCreditLossesMember
5158 Stage 2: Lifetime expected credit losses [member] Member ifrs-full:LifetimeExpectedCreditLossesMember
5159 Stage 3: Lifetime Expected Credit Losses [member] Member ing:StageThreeLifetimeExpectedCreditLossesMember
5160 Internal credit grades [axis] Axis ifrs-full:InternalCreditGradesAxis
5161 Entity's total for internal credit grades [member] Member ifrs-full:EntitysTotalForInternalCreditGradesMember
5162 Performing [member] Member ing:PerformingMember
5163 Investment grade [member] Member ing:InvestmentGradeMember
5164 Non-investment grade [member] Member ing:NoninvestmentGradeWholesaleMember
5165 Substandard grade [member] Member ing:SubstandardGradeMember
5166 Non-performing grade [member] Member ing:NonperformingGradeMember
5167 Internal credit grade Member ifrs-full:InternalCreditGradesMember
5168 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
5169 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
5170 Other CRR/CRD IV eligible [Member] Member ing:OtherCrrcrdIvEligibleMember
5171 Guarantees [member] Member ifrs-full:GuaranteesMember
5172 Disclosure of credit risk exposure [line items] LineItems ifrs-full:DisclosureOfCreditRiskExposureLineItems
5173 Percentage of increase or (decrease) in collateralisation level Concept (Percent) For Period ing:PercentageOfChangeInCollateralisationLevel
5174 Percentage of residential mortgage oustandings Concept (Percent) For Period ing:PercentageOfResidentialMortgageOustandings
5175 Maximum loan to market value existing property, construction property financing Concept (Percent) As Of ing:MaximumLoanToMarketValueExistingPropertyConstructionPropertyFinancing
5176 Valuation methodology, cover values Concept (Text/String) For Period ing:ValuationMethodologyCoverValues
5177 Percentage of business lending of outstandings Concept (Percent) For Period ing:PercentageOfBusinessLendingOfOutstandings
5178 Increase in business lending outstandings Concept (Monetary) For Period Credit ing:IncreaseInBusinessLendingOutstandings
5179 Percentage for no covers Concept (Percent) As Of ing:PercentageForNoCovers
5180 Increase or (decrease) in covers Concept (Monetary) For Period Debit ing:AmountOfIncreaseOrDecreaseInLoansOrReceivablesRelatedCreditDerivativesOrSimilarInstrumentsMitigateMaximumExposureToCreditRisk
5181 Percentage Of net Outstandings Concept (Percent) For Period ing:PercentageOfNetOutstandings
5182 Increase (decrease) in portfolio size Concept (Monetary) For Period Credit ing:IncreaseDecreaseInPortfolioSize
5183 Increase or (decrease) in Coverage ratio Concept (Percent) For Period ing:PercentageOfOutstandingLoansCoverageRatio
5184 Percentage of Cover values increase decrease Concept (Percent) For Period ing:PercentageOfCoverValuesIncreaseDecrease
5185 Percentage of net notional Pre-Settlement exposure Concept (Percent) For Period ing:PercentageOfNetNotionalPresettlementExposure
5186 Percentage of notional Pre-Settlement exposure cleared by Central Clearing Parties Concept (Percent) For Period ing:PercentageOfNotionalPresettlementExposureClearedByCentralClearingParties
5187 Percentage of CEM exposure confidence level Concept (Percent) For Period ing:PercentageOfCemExposureConfidenceLevel
5188 Financial assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
5189 Percentage of exposure to loan risk not eligible for IFRS Concept (Percent) For Period ing:PercentageOfExposureToLoanRiskNotEligibleForIfrs
5190 CEM exposure, derivatives and securities Concept (Percent) For Period ing:PercentageOfCemExposureConfidenceLevelDerivativesAndSecurities
5191 046089 - Disclosure - Risk Management Section - Other Additional information (Detail) Network

*

*

 http://www.ing.com/role/RiskManagementSectionOtherAdditionalInformationDetail
5192 Financial assets provisions [table] Table

*

*

 ing:FinancialAssetsProvisionsTable
5193 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
5194 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
5195 Loans to consumers [member] Member ifrs-full:ConsumerLoansMember
5196 Individually Significant Financial Asset (ISFA) [member] Member ing:IndividuallySignificantFinancialAssetIsfaMember
5197 Individually Not Significant Financial Asset (INSFA) [member] Member ing:IndividuallyNotSignificantFinancialAssetInsfaMember
5198 Incurred but not recognised (IBNR) [member] Member ing:IncurredButNotRecognisedIbnrMember
5199 ING Bank portfolio [member] Member ing:INGBankPortfolioMember
5200 Transportation & Logistics [member] Member ing:TransportationAndLogisticsMember
5201 Natural resources [Member] Member ing:NaturalResourcesMember
5202 Real estate [member] Member ing:RealEstate1Member
5203 Builders And Contractors [Member] Member ing:BuildersAndContractorsMember
5204 Segments [axis] Axis ifrs-full:SegmentsAxis
5205 Segments [member] Member ifrs-full:SegmentsMember
5206 Wholesale Banking [member] Member ing:WholesaleBankingMember
5207 Retail Banking [Member] Member ing:RetailBankingMember
5208 Corporate Line [member] Member ing:CorporateLineMember
5209 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
5210 Assets [member] Member ifrs-full:ClassesOfAssetsMember
5211 Equity securities [member] Member ifrs-full:TradingEquitySecuritiesMember
5212 Equity Securiity at FVOCI [Member] Member ing:EquitySecuriityAtFvociMember
5213 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
5214 Risks [member] Member ifrs-full:TypesOfRisksMember
5215 Downward Scenario [Member] Member ing:DownwardScenarioMember
5216 Upward Scenario [member] Member ing:UpwardScenarioMember
5217 Equity price risk [member] Member ifrs-full:EquityPriceRiskMember
5218 Range [axis] Axis ifrs-full:RangeAxis
5219 Ranges [member] Member ifrs-full:RangesMember
5220 Minimum [member] Member ifrs-full:BottomOfRangeMember
5221 Maximum [member] Member ifrs-full:TopOfRangeMember
5222 Internal credit grades [axis] Axis ifrs-full:InternalCreditGradesAxis
5223 Entity's total for internal credit grades [member] Member ifrs-full:EntitysTotalForInternalCreditGradesMember
5224 Performing [member] Member ing:PerformingMember
5225 Non-performing [member] Member ing:NonperformingMember
5226 Non-performing exposure [member] Member ing:NonperformingExposureMember
5227 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
5228 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
5229 Netherlands [member] Member country:NL
5230 Asia [Member] Member srt:AsiaMember
5231 Netherlands and Belgium [member] Member ing:NetherlandsAndBelgiumMember
5232 Europe [member] Member srt:EuropeMember
5233 Rest of Europe [Member] Member ing:RestOfEuropeMember
5234 Measurement [axis] Axis ifrs-full:MeasurementAxis
5235 Aggregated measurement [member] Member ifrs-full:AggregatedMeasurementMember
5236 Fair Value Through Profit Or Loss [member] Member ing:FairValueThroughProfitOrLossMember
5237 At cost [member] Member ifrs-full:AtCostMember
5238 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
5239 Financial instruments, class [member] Member ifrs-full:ClassesOfFinancialInstrumentsMember
5240 Residential Mortgages [member] Member ing:ResidentialMortgagesMember
5241 Dutch residential mortgages portfolio [member] Member ing:DutchMortgagesPortfolioMember
5242 Belgium Residential mortgage portfolio [Member] Member ing:BelgiumResidentialMortgagePortfolioMember
5243 Entity Sector Industry Classifications, Sector [Axis] Axis dei:EntitySectorIndustryClassificationsSectorAxis
5244 Sector [Domain] Member dei:SectorDomain
5245 Office [member] Member ing:OfficeMember
5246 Retail And Residential [Member] Member ing:RetailAndResidentialMember
5247 Impairment of financial assets [axis] Axis ifrs-full:ImpairmentOfFinancialAssetsAxis
5248 Entity's total for impairment of financial assets [member] Member ifrs-full:EntitysTotalForImpairmentOfFinancialAssetsMember
5249 Financial assets past due but not impaired [member] Member ifrs-full:FinancialAssetsPastDueButNotImpairedMember
5250 Financial assets provisions [line items] LineItems ing:FinancialAssetsProvisionsLineItems
5251 Risk rating description Concept (Text/String) For Period ifrs-full:DescriptionOfInternalCreditRatingsProcess
5252 Increase in past due exposure for consumer loans Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
5253 Deterioration in past due obligations description Concept (Text/String) For Period ifrs-full:DescriptionOfOtherInformationUsedToAssessCreditQuality
5254 Threshold amount Concept (Monetary) For Period Debit ing:ThresholdAmountSignifyingCreditRiskInFinancialAsset
5255 Provisions Concept (Monetary) For Period Debit ing:FinancialAssetProvisionForCreditLoss
5256 Risk costs Concept (Monetary) For Period Debit ing:FinancialAssetRiskCosts
5257 Increase in risk costs Concept (Percent) For Period ing:FinancialRiskCostsIncreasePercentage
5258 Decrease in provisions Concept (Monetary) For Period Credit ifrs-full:ChangesInOtherProvisions
5259 Provisions Concept (Monetary) As Of Credit ifrs-full:Provisions
5260 Provisions coverage ratio Concept (Percent) For Period ing:ProvisionsCoverageRatio
5261 Increase (Decrease) Of Forborne Assets Concept (Monetary) For Period Debit ing:IncreaseDecreaseOfForborneAssets
5262 Decrease of forborne assets, percentage Concept (Percent) For Period ing:DecreaseInPercentageOfForborneAssets
5263 Forborne assets Concept (Monetary) As Of Debit ing:ForborneAssets
5264 Percentage of forborne assets Concept (Percent) For Period ing:ProportionOfPortfolioPercentage
5265 Percentage of forborne assets Concept (Percent) For Period ing:PercentageOfForborneAssets
5266 Economic capital for market risk confidence interval percentage Concept (Percent) For Period ing:EconomicCapitalForMarketRiskConfidenceInterval
5267 Value at risk confidence interval percentage Concept (Percent) For Period ing:ValueAtRiskConfidenceInterval
5268 Floor interest rates Concept (Percent) For Period ing:FloorInterestRates
5269 Change in NPV-at-Risk Concept (Monetary) For Period Credit ing:ChangeInNetPresentValueAtRisk
5270 Increase decrease in Basis point value per currency Concept (Monetary) For Period Debit ing:IncreaseDecreaseInBasisPointValuePerCurrency
5271 BPV impact Concept (Monetary) For Period Credit ing:BasisPointValuePerCurrencyImpact
5272 Common equity tier one ratio probability of drop Concept (Percent) For Period ing:CommonEquityTierOneRatioProbabilityDropPercentage
5273 Drop in common equity tier one ratio Concept (Percent) For Period ing:CommonEquityTierOneRatio
5274 Investments in associates and joint ventures Concept (Monetary) As Of Debit ifrs-full:InvestmentsInSubsidiariesJointVenturesAndAssociates
5275 Equity securities held in the available-for-sale Concept (Monetary) As Of Debit ing:AvailableForSaleEquitySecurities
5276 Securities held at fair value through other comprehensive income Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncome
5277 Revaluation reserve Concept (Monetary) As Of Credit ifrs-full:RevaluationSurplus
5278 Increase (decrease) in financial assets Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseInFinancialAssets
5279 Revaluation reserve relating to equity securities held in available-for-sale portfolio Concept (Monetary) As Of Credit ing:AvailableforsaleRevaluationReserve
5280 Increase (decrease) in available-for-sale portfolio Concept (Monetary) For Period Debit ing:IncreaseDecreaseInAvailableforsaleFinancialAssets
5281 Total real estate exposure Concept (Monetary) As Of Debit ing:RealEstateMarketRisk
5282 Change in real estate market risk exposure in the banking books Concept (Monetary) As Of Debit ing:ChangeInRealEstateMarketRisk
5283 Additional valuation adjustment Concept (Monetary) For Period Credit ing:EquityValuationAdjustments
5284 Loan-to-Deposit ratio Concept (Percent) For Period ing:PercentageOfLoanToDepositRatio
5285 AMA capital requirement Concept (Monetary) As Of Credit ing:CapitalPerRegulatoryRequirements
5286 Withholding tax will be imposed on withholdable payments Concept (Percent) For Period ing:WithholdingTaxPercentage
5287 2020 Ambition of cost/income ratio Concept (Percent) For Period ing:UltimateGoalForCostIncomeRatioPercentage
5288 Percentage of funding contribution Concept (Percent) For Period ing:PercentageOfFundingContribution
5289 Settlement with the Dutch Authorities Concept (Monetary) For Period Debit ifrs-full:LossesOnLitigationSettlements
5290 047001 - Disclosure - Capital Management - Additional Information (Detail) Network

*

*

 http://www.ing.com/role/CapitalManagementAdditionalInformationDetail
5291 Disclosure of Capital management [table] Table

*

*

 ing:DisclosureOfCapitalManagementTable
5292 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
5293 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
5294 ING Bank N.V. [member] Member ing:INGBankNVMember
5295 Non-adjusting events after reporting period [axis] Axis ifrs-full:NonadjustingEventsAfterReportingPeriodAxis
5296 Non-adjusting events after reporting period [member] Member ifrs-full:NonadjustingEventsMember
5297 Events After Reporting Period [Member] Member ing:EventsAfterReportingPeriodMember
5298 Debt Instrument 1 [Axis] Axis ing:DebtInstrument1Axis
5299 Debt Instrument [Domain] Member ing:DebtInstrumentDomain
5300 Grandfathered tier 1 bonds [member] Member ing:GrandfatheredTier1BondsMember
5301 Tier 2 bonds [member] Member ing:Tier2BondsMember
5302 Tier 1 bonds [member] Member ing:Tier1BondsMember
5303 Tier 2 private placement bonds [member] Member ing:Tier2PrivatePlacementBondsMember
5304 Senior HoldCo[member] Member ing:SeniorHoldcoMember
5305 Pillar 1 requirement [member] Member ing:Pillar1RequirementMember
5306 Pillar 2 requirement [member] Member ing:Pillar2RequirementMember
5307 Capital Conservation Buffer [member] Member ing:CapitalConservationBufferMember
5308 Countercyclical Buffer [member] Member ing:CountercyclicalBufferMember
5309 Systemic Risk Buffer [member] Member ing:SystemicRiskBufferMember
5310 Range [axis] Axis ifrs-full:RangeAxis
5311 Ranges [member] Member ifrs-full:RangesMember
5312 Maximum [member] Member ifrs-full:TopOfRangeMember
5313 Minimum [member] Member ifrs-full:BottomOfRangeMember
5314 Disclosure of Capital Management [Line Items] LineItems ing:DisclosureOfCapitalManagementLineItems
5315 Confidence level percentage to calculate stress test Concept (Percent) For Period ing:ConfidenceLevelPercentageToCalculateStressTest
5316 Redemption of bonds Concept (Monetary) For Period Debit ing:RedemptionOfDebt
5317 Exchange of bonds Concept (Monetary) For Period Credit ing:ExchangeOfBondsToNotes
5318 Issue of bonds Concept (Monetary) As Of Credit ifrs-full:CurrentBondsIssuedAndCurrentPortionOfNoncurrentBondsIssued
5319 Transitional (phased-in) common equity Tier 1 required Concept (Percent) For Period ing:TransitionalCommonEquityTierOneCapitalRequiredPercentage
5320 SREP required percentage Concept (Percent) For Period ing:SupervisoryReviewAndEvaluationProcessCapitalRequirementPercentage
5321 Maximum Distributable Amount trigger level percentage Concept (Percent) For Period ing:MaximumDistributableAmountTriggerLevel
5322 Maximum Distributable Amount trigger level, 2019 Concept (Percent) For Period ing:MaximumDistributableAmountTriggerLevelYearOne
5323 Maximum Distributable Amount trigger level, 2019 Concept (Percent) For Period ing:MaximumDistributableAmountTriggerLevelYearTwo
5324 Common equity Tier 1 ratio and a fully- loaded common equity Tier 1 ratio Concept (Percent) For Period ing:CommonEquityAndFullyLoadedCommonEquityTierOneCapitalPercentage
5325 Fully- loaded common equity Tier 1 ratio Concept (Percent) For Period ing:FullyLoadedCommonEquityTierOneCapitalPercentage
5326 Decrease in Transitional (phased-in) common equity Tier 1 capital Concept (Percent) For Period ing:DecreaseInTransitionalCommonEquityTierOneCapitalRequiredPercentage
5327 Decrease in Fully- loaded common equity Tier 1 ratio Concept (Percent) For Period ing:DecreaseInFullyLoadedCommonEquityTierOneCapitalPercentage
5328 TLAC risk-weighted assets mimimum percentage required Concept (Percent) For Period ing:TotalLossAbsorbingCapacityRiskWeightedAssetsRequiredMinimumPercentage
5329 TLAC leverage ratio mimimum percentage required Concept (Percent) For Period ing:TotalLossAbsorbingCapacityLeverageRatioExposureRequiredMinimumPercentage
5330 Cash dividend paid Concept (Monetary) For Period Debit us-gaap:CashDividendsPaidToParentCompany
5331 Fully loaded in Tier 1 ratios (including grandfathered securities) Concept (Percent) For Period ing:FullyLoadedInTier1Ratios
5332 Phased-in Tier 1 ratio (including grandfathered securities) Concept (Percent) For Period ing:PhasedinTier1Ratios
5333 Fully loaded total capital ratio (including grandfathered securities) Concept (Percent) For Period ing:FullyLoadedTotalCapitalRatio
5334 Phased in total capital ratio (including grandfathered securities) Concept (Percent) For Period ing:PhasedInTotalCapitalRatio
5335 Proposed cash dividend Concept (Monetary) For Period ifrs-full:DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwners
5336 Proposed cash dividend, per ordinary share Concept (Share) For Period ifrs-full:DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwnersPerShare
5337 Interim dividend paid Concept (Share) For Period ifrs-full:DividendsPaidOtherSharesPerShare
5338 Final dividend payable, per ordinary share Concept (Share) For Period ing:FinalDividendPayablePerShare
5339 Final dividend payable Concept (Monetary) As Of Credit ifrs-full:DividendsPayable
5340 Tier 1 minimum requirements Concept (Percent) For Period ing:MinimumTierOneCapitalRequirement
5341 Minimum capital ratio required Concept (Percent) For Period ing:MinimumCapitalRatioRequired
5342 Minimum capital required Concept (Percent) For Period ing:MinimumCapitalRequirementPercentage
5343 Risk weighted assets required Concept (Percent) For Period ing:MinimumPercentageOfRiskWeightedAssetsToBeMaintainedForRegulatoryCapital
5344 MREL, percentage Concept (Percent) For Period ing:MinimumRequirementsForOwnFundsAndEligibleLiabilitiesPercentage
5345 CET1 ratio Concept (Percent) For Period ing:CommonEquityTierOneCapitalRatioMinimum
5346 Annual underlying ROE Concept (Percent) For Period ing:ReturnOnEquityRatio
5347 047002 - Disclosure - Capital Management - ING Capital Position (Detail) Network

*

*

 http://www.ing.com/role/CapitalManagementINGCapitalPositionDetail
5348 Disclosure of Capital management [table] Table

*

*

 ing:DisclosureOfCapitalManagementTable
5349 Capital requirements [axis] Axis ifrs-full:CapitalRequirementsAxis
5350 Capital Requirements [Member] Member ifrs-full:CapitalRequirementsMember
5351 fully-loaded [member] Member ing:FullyloadedMember
5352 Phased-in [member] Member ing:PhasedinMember
5353 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
5354 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
5355 ING Bank N.V. [member] Member ing:INGBankNVMember
5356 Disclosure of Capital Management [Line Items] LineItems ing:DisclosureOfCapitalManagementLineItems
5357 Shareholders' equity Concept (Monetary) As Of Credit ifrs-full:Equity
5358 Differences IFRS-IASB and IFRS-EU Concept (Monetary) As Of Credit ing:DifferencesIFRSIASBAndIFRSEU
5359 - Interim profit not included in CET1 capital Concept (Monetary) For Period Credit ing:InterimProfitNotIncludedInCommonEquityTierOneCapital
5360 - Other adjustments Concept (Monetary) As Of Credit ing:OtherAdjustmentsToRegulatoryCapital
5361 Regulatory adjustments Concept (Monetary) For Period Debit ing:RegulatoryAdjustments
5362 Available common equity Tier 1 capital Concept (Monetary) As Of Credit ing:CommonEquityTierOneCapitalAmount
5363 Additional Tier 1 securities Concept (Monetary) As Of Credit ing:AdditionalTierOneCapital
5364 Regulatory adjustments additional Tier 1 Concept (Monetary) As Of Credit ing:AdditionalTierOneRegulatoryAdjustments
5365 Available Tier 1 capital Concept (Monetary) As Of Credit ing:TierOneCapitalAmount
5366 Supplementary capital Tier 2 bonds Concept (Monetary) For Period Credit ing:SupplementaryCapitalTier2Bonds
5367 Regulatory adjustments Tier 2 Concept (Monetary) For Period Debit ing:RegulatoryAdjustmentsTier2
5368 Available Total capital Concept (Monetary) As Of Credit ing:Capital1
5369 Risk weighted assets Concept (Monetary) As Of Debit ing:RiskWeightedAssets1
5370 Common equity Tier 1 ratio Concept (Percent) As Of ing:CommonEquityTierOneCapitalRatio1
5371 Tier 1 ratio Concept (Percent) As Of ing:TierOneCapitalRatio
5372 Total capital ratio Concept (Percent) As Of ing:CapitalRatio
5373 047003 - Disclosure - Capital Management - ING Capital Position (Parenthetical) (Detail) Network

*

*

 http://www.ing.com/role/CapitalManagementINGCapitalPositionParentheticalDetail
5374 Disclosure of Capital management [table] Table

*

*

 ing:DisclosureOfCapitalManagementTable
5375 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
5376 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
5377 ING Bank N.V. [member] Member ing:INGBankNVMember
5378 Disclosure of Capital Management [Line Items] LineItems ing:DisclosureOfCapitalManagementLineItems
5379 Interim profit not included in CET Concept (Monetary) For Period Credit ing:InterimProfitNotIncludedInCommonEquityTierOneCapital
5380 Interim profit not included in CET, before Interim dividend paid Concept (Monetary) For Period Credit ing:InterimProfitNotIncludedInCommonEquityTierOneCapitalBeforeInterimDividendPayment
5381 Interim dividend paid Concept (Monetary) For Period Debit ing:InterimDividendsPaid
5382 Additional Tier 1 securities Concept (Monetary) As Of Credit ing:AdditionalTierOneCapital
5383 Additional Tier 1 securities subject to CRR/CRD IV grandfathering rules Concept (Monetary) As Of Credit ing:AdditionalTierOneCapitalAsPerCRRCRDIVGrandfatheringRules
5384 Supplementary capital Tier 2 bonds Concept (Monetary) For Period Credit ing:SupplementaryCapitalTier2Bonds
5385 Supplementary capital Tier 2 bonds subject to CRR/CRD IV grandfathering rules Concept (Monetary) For Period Credit ing:SupplementaryCapitalTierBondsAsPerCRRCRDIVGrandfatheringRules
5386 047010 - Disclosure - Capital Management - Main Credit Ratings of ING (Detail) Network

*

*

 http://www.ing.com/role/CapitalManagementMainCreditRatingsOfINGDetail
5387 Disclosure of Capital management [table] Table

*

*

 ing:DisclosureOfCapitalManagementTable
5388 Credit Rating Source [Axis] Axis invest:CreditRatingSourceAxis
5389 Credit Rating Source [Domain] Member invest:CreditRatingSourceDomain
5390 Standard And Poor [Member] Member ing:StandardAndPoorMember
5391 Moodys [Member] Member ing:MoodysMember
5392 Fitch [Member] Member ing:FitchMember
5393 Legal Entity [Axis] Axis dei:LegalEntityAxis
5394 Entity [Domain] Member dei:EntityDomain
5395 ING Bank N.V. [member] Member ing:INGBankNVMember
5396 Disclosure of Capital Management [Line Items] LineItems ing:DisclosureOfCapitalManagementLineItems
5397 CreditRatingsOnLongtermDebtDescription Concept (Text/String) For Period ing:CreditRatingStatusLongTerm
5398 CreditRatingsOnShortTermDebtDescription Concept (Text/String) For Period ing:CreditRatingStatusShortTerm

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*