KB Financial Group Inc. (SEC Filing Page | XBRL Cloud Viewer | XBRL Instance)

Line Label Object Class Period Type Balance Report ElementName
1 00010000 - Document - Document and Entity Information Network

*

*

 http://www.kbfg.com/role/DocumentAndEntityInformation
2 Implied Table Table

*

*

 implied:Table
3 Document and Entity Information [Abstract] Abstract kb: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 Entity Registrant Name Concept (Text/String) For Period dei:EntityRegistrantName
10 Entity Central Index Key Concept (CIK Number) For Period dei:EntityCentralIndexKey
11 Current Fiscal Year End Date Concept (Month/Day) For Period dei:CurrentFiscalYearEndDate
12 Entity Filer Category Concept (Filer Category) For Period dei:EntityFilerCategory
13 Entity Common Stock Shares Outstanding Concept (Shares) As Of dei:EntityCommonStockSharesOutstanding
14 Entity Well Known Seasoned Issuer Concept (Yes/No) For Period dei:EntityWellKnownSeasonedIssuer
15 Entity Current Reporting Status Concept (Yes/No) For Period dei:EntityCurrentReportingStatus
16 10010000 - Statement - Consolidated Statement Of Financial Position Network

*

*

 http://www.kbfg.com/role/ConsolidatedStatementOfFinancialPosition
17 Implied Table Table

*

*

 implied:Table
18 Statement Of Financial Position Abstract [Abstract] Abstract ifrs-full:StatementOfFinancialPositionAbstract
19 ASSETS Abstract ifrs-full:AssetsAbstract
20 Cash and due from financial institutions Concept (Monetary) As Of Debit us-gaap:CashAndDueFromBanks
21 Financial assets at fair value through profit or loss Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLoss
22 Derivative Financial Assets Concept (Monetary) As Of Debit ifrs-full:DerivativeFinancialAssets
23 Loans Concept (Monetary) As Of Debit ifrs-full:LoansAndReceivables
24 Financial Investments Concept (Monetary) As Of Debit kb:FinancialInvestments
25 Investments in associates and joint ventures Concept (Monetary) As Of Debit ifrs-full:InvestmentsInSubsidiariesJointVenturesAndAssociates
26 Property and equipment Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
27 Investment property Concept (Monetary) As Of Debit ifrs-full:InvestmentProperty
28 Intangible assets Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsAndGoodwill
29 Net defined benefit assets Concept (Monetary) As Of Debit ifrs-full:CurrentRecognisedAssetsDefinedBenefitPlan
30 Current income tax assets Concept (Monetary) As Of Debit ifrs-full:CurrentTaxAssets
31 Deferred income tax assets Concept (Monetary) As Of Debit ifrs-full:DeferredTaxAssets
32 Assets held for sale Concept (Monetary) As Of Debit ifrs-full:NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSale
33 Other Assets Concept (Monetary) As Of Debit ifrs-full:OtherAssets
34 Total assets Concept (Monetary) As Of Debit ifrs-full:Assets
35 LIABILITIES Abstract ifrs-full:LiabilitiesAbstract
36 Financial Liabilities At Fair Value Through Profit Or Loss Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLoss
37 Derivative Financial Liabilities Concept (Monetary) As Of Credit ifrs-full:DerivativeFinancialLiabilities
38 Deposits Concept (Monetary) As Of Credit ifrs-full:DepositsFromCustomers
39 Debts Concept (Monetary) As Of Credit kb:Debts
40 Debentures Concept (Monetary) As Of Credit ifrs-full:NotesAndDebenturesIssued
41 Provisions Concept (Monetary) As Of Credit ifrs-full:Provisions
42 Net Defined benefit liabilities Concept (Monetary) As Of Credit ifrs-full:LiabilityAssetOfDefinedBenefitPlans
43 Current income tax liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentTaxLiabilities
44 Deferred income tax liabilities Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilities
45 Insurance contract liabilities Concept (Monetary) As Of Credit ifrs-full:LiabilitiesArisingFromInsuranceContracts
46 Other Liabilities Concept (Monetary) As Of Credit ifrs-full:OtherLiabilities
47 Total liabilities Concept (Monetary) As Of Credit ifrs-full:Liabilities
48 TOTAL EQUITY Abstract ifrs-full:EquityAbstract
49 Capital stock Concept (Monetary) As Of Credit ifrs-full:IssuedCapital
50 Capital surplus Concept (Monetary) As Of Credit ifrs-full:CapitalReserve
51 Accumulated Other Comprehensive Income Concept (Monetary) As Of Credit ifrs-full:AccumulatedOtherComprehensiveIncome
52 Retained Earnings Concept (Monetary) As Of Credit ifrs-full:RetainedEarnings
53 Treasury Shares Concept (Monetary) As Of Debit ifrs-full:TreasuryShares
54 Equity attributable to shareholders of the company Concept (Monetary) As Of Credit ifrs-full:EquityAttributableToOwnersOfParent
55 Non-controlling interests Concept (Monetary) As Of Credit ifrs-full:NoncontrollingInterests
56 Total Equity Concept (Monetary) As Of Credit ifrs-full:Equity
57 Total liabilities and equity Concept (Monetary) As Of Credit ifrs-full:EquityAndLiabilities
58 10020000 - Statement - Consolidated Statements Of Comprehensive Income Network

*

*

 http://www.kbfg.com/role/ConsolidatedStatementsOfConprehensiveIncome
59 Implied Table Table

*

*

 implied:Table
60 Statement Of Comprehensive Income Abstract [Abstract] Abstract ifrs-full:StatementOfComprehensiveIncomeAbstract
61 Interest income Concept (Monetary) For Period Credit ifrs-full:RevenueFromInterest
62 Interest expense Concept (Monetary) For Period Debit ifrs-full:InterestExpense
63 Net interest income Concept (Monetary) For Period Credit ifrs-full:InterestRevenueExpense
64 Fee And Commission Income Concept (Monetary) For Period Credit ifrs-full:FeeAndCommissionIncome
65 Fee And Commission Expense Concept (Monetary) For Period Debit ifrs-full:FeeAndCommissionExpense
66 Net fee and commission income Concept (Monetary) For Period Credit ifrs-full:FeeAndCommissionIncomeExpense
67 Insurance income Concept (Monetary) For Period Credit ifrs-full:IncomeArisingFromInsuranceContracts
68 Insurance expense Concept (Monetary) For Period Debit ifrs-full:ExpenseArisingFromInsuranceContracts
69 Net insurance income(expense) Concept (Monetary) For Period Credit kb:IncomeExpenseArisingFromInsuranceContracts
70 Net gains(losses) on financial assets/liabilities at fair value through profit or loss Concept (Monetary) For Period Credit kb:GainLossOnFinancialAssetsLiabilitiesAtFairValueThroughProfitOrLoss
71 Net other operating income(expense) Concept (Monetary) For Period Credit ifrs-full:OtherOperatingIncomeExpense
72 General and administrative expenses Concept (Monetary) For Period Debit ifrs-full:AdministrativeExpense
73 Operating profit before provision for credit losses Concept (Monetary) For Period Credit kb:ProfitLossFromOperatingAcitivitiesBeforeProvisionForCreditLosses
74 Provision For Credit Losses Concept (Monetary) For Period Debit kb:ProvisionForCreditLosses
75 Net operating profit Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromOperatingActivities
76 Share of profit of associates and joint ventures Concept (Monetary) For Period Credit kb:GainLossOnAssociatesAccountsUsingEquityMethod
77 Net other non-operating income(expense) Concept (Monetary) For Period Credit us-gaap:OtherNonoperatingIncomeExpense
78 Net non-operating profit (loss) Concept (Monetary) For Period Credit us-gaap:NonoperatingIncomeExpense
79 Profit before income tax Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
80 Income tax expense Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
81 Profit for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
82 Items that will not be reclassified to profit or loss Abstract ifrs-full:ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTaxAbstract
83 Remeasurements of net defined benefit liabilities Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans
84 Share Of Other Comprehensive Income Of Associates And Joint Ventures Accounted For Using Equity Method That Will Not Be Reclassified To Profit Or Loss Net Of Tax Concept (Monetary) For Period Credit ifrs-full:ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillNotBeReclassifiedToProfitOrLossNetOfTax
85 Items that will not be reclassified to profit or loss (Sub Total) Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax
86 Items that may be reclassified subsequently to profit or loss Abstract ifrs-full:ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract
87 Exchange differences on translating foreign operations Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation
88 Change in value of financial investments Concept (Monetary) For Period Credit kb:OtherComprehensiveIncomeNetOfTaxFinancialInvestments
89 Shares of other comprehensive income of associates and joint ventures Concept (Monetary) For Period Credit ifrs-full:ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossNetOfTax
90 Cash flow hedges Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxCashFlowHedges
91 Gains(losses) on hedges of a net investment in a foreign operation Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxHedgesOfNetInvestmentsInForeignOperations
92 Other comprehensive income of separate account Concept (Monetary) For Period Debit kb:OtherComprehensiveIncomeNetOfTaxHedgesOfSeparateAccount
93 Items that may be reclassified subsequently to profit or loss(Sub Total) Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax
94 Other comprehensive income(loss) for the year, net of tax Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncome
95 Total comprehensive income for the year Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
96 Profit attributable to Abstract ifrs-full:ProfitLossAttributableToAbstract
97 Shareholders of the parent company Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOwnersOfParent
98 Non-controlling interests Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToNoncontrollingInterests
99 Profit attributable (Sub Total) Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
100 Total comprehensive income for the year attributable to Abstract ifrs-full:ComprehensiveIncomeAttributableToAbstract
101 Shareholders of the parent company Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncomeAttributableToOwnersOfParent
102 Non-controlling interests Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncomeAttributableToNoncontrollingInterests
103 Total comprehensive income for the year Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
104 Earnings Per Share Abstract ifrs-full:EarningsPerShareAbstract
105 Basic earnings per share Concept (Share) For Period ifrs-full:BasicEarningsLossPerShare
106 Diluted earnings per share Concept (Share) For Period ifrs-full:DilutedEarningsLossPerShare
107 10030000 - Statement - Consolidated Statements Of Changes In Equity Network

*

*

 http://www.kbfg.com/role/ConsolidatedStatementsOfChangesInEquity
108 Statement Of Changes In Equity Table [Table] Table

*

*

 ifrs-full:StatementOfChangesInEquityTable
109 Components Of Equity Axis [Axis] Axis ifrs-full:ComponentsOfEquityAxis
110 Equity Member [Domain] Member ifrs-full:EquityMember
111 Equity attributable to shareholders of the parent company Member ifrs-full:EquityAttributableToOwnersOfParentMember
112 Capital Stock Member ifrs-full:IssuedCapitalMember
113 Capital surplus Member ifrs-full:CapitalReserveMember
114 Accumulated other comprehensive income Member ifrs-full:AccumulatedOtherComprehensiveIncomeMember
115 Retained earnings Member ifrs-full:RetainedEarningsMember
116 Treasury shares Member ifrs-full:TreasurySharesMember
117 Non-controlling interest Member ifrs-full:NoncontrollingInterestsMember
118 Statement Of Changes In Equity Line Items [Line Items] LineItems ifrs-full:StatementOfChangesInEquityLineItems
119 Balance at beginnig Concept (Monetary) As Of Credit ifrs-full:Equity
120 Comprehensive income Abstract ifrs-full:StatementOfComprehensiveIncomeAbstract
121 Profit for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
122 Remeasurements of net defined benefit liabilities Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans
123 Exchange differences on translating foreign operations Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation
124 Change in value of financial investments Concept (Monetary) For Period Credit kb:OtherComprehensiveIncomeNetOfTaxFinancialInvestments
125 Share Of Other Comprehensive Income Of Associates And Joint Ventures Accounted For Using Equity Method Concept (Monetary) For Period Credit ifrs-full:ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
126 Cash flow hedges Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxCashFlowHedges
127 Losses on hedges of a net investment in a foreign operation Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxHedgesOfNetInvestmentsInForeignOperations
128 Other comprehensive income of separate account Concept (Monetary) For Period Credit kb:OtherComprehensiveIncomeNetOfSeparateAccount
129 Transfer to other accounts Concept (Monetary) For Period Credit kb:TransferToOtherAccounts
130 Total comprehensive income for the year Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
131 Transactions with shareholders Abstract ifrs-full:ChangesInEquityAbstract
132 Dividends paid to shareholders of the parent company Concept (Monetary) For Period Debit ifrs-full:DividendsPaid
133 Disposal of treasury shares Concept (Monetary) For Period Credit ifrs-full:SaleOrIssueOfTreasuryShares
134 Acquisition of treasury shares Concept (Monetary) For Period Debit ifrs-full:PurchaseOfTreasuryShares
135 Changes in interest in subsidiaries Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughAcquisitionOfSubsidiary
136 Issue of ordinary shares related to business combination Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughTransactionsWithOwners
137 Others Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesEquity
138 Total transactions with shareholders Concept (Monetary) For Period Credit ifrs-full:ChangesInEquity
139 Balance at ending Concept (Monetary) As Of Credit ifrs-full:Equity
140 10040000 - Statement - Cash Flows Network

*

*

 http://www.kbfg.com/role/CashFlows
141 Implied Table Table

*

*

 implied:Table
142 Statement Of Cash Flows Abstract [Abstract] Abstract ifrs-full:StatementOfCashFlowsAbstract
143 Cash flows from operating activities Abstract ifrs-full:CashFlowsFromUsedInOperatingActivitiesAbstract
144 Profit for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
145 Adjustment for non-cash items Abstract ifrs-full:AdjustmentsForReconcileProfitLossAbstract
146 Net loss(gain) on financial assets/liabilities at fair value through profit or loss Concept (Monetary) For Period Credit kb:AdjustmentsForGainLossOnFinancialAssetsLiabilitiesAtFairValueThroughProfitOrLoss
147 Net loss(gain) on derivative financial instruments for hedging purposes Concept (Monetary) For Period Credit kb:AdjustmentsForGainLossOnDerivativeFinancialInstrumentsForHedgingPurposes
148 Adjustment of fair value of derivative financial instruments Concept (Monetary) For Period Credit ifrs-full:AdjustmentsForGainsLossesOnChangeInFairValueOfDerivatives
149 Provision For Credit Losses Concept (Monetary) For Period Debit kb:ProvisionForCreditLosses
150 Net loss(gain) on financial investments Concept (Monetary) For Period Credit kb:AdjustmentsForGainLossOnFinancialInstruments
151 Share of loss (profit) of associates and joint ventures Concept (Monetary) For Period Credit kb:GainLossOnAssociatesAccountsUsingEquityMethod
152 Depreciation and amortization expense Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDepreciationAndAmortisationExpense
153 Other net losses on property and equipment/intangible assets Concept (Monetary) For Period Credit kb:AdjustmentsForGainLossOnDisposalsPropertyPlantAndEquipmentAndIntangibleAssets
154 Share-based payments Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForSharebasedPayments
155 Policy reserve appropriation Concept (Monetary) For Period Credit ifrs-full:ExpenseIncomeIncludedInProfitOrLossLiabilitiesUnderInsuranceContractsAndReinsuranceContractsIssued
156 Post-employment benefits Concept (Monetary) For Period Debit ifrs-full:PostemploymentBenefitExpenseDefinedBenefitPlans
157 Net interest expense Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForInterestExpense
158 Loss(gain) on foreign currency translation Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForUnrealisedForeignExchangeLossesGains
159 Gains on bargain purchase Concept (Monetary) For Period Credit ifrs-full:GainRecognisedInBargainPurchaseTransaction
160 Net other expense(income) Concept (Monetary) For Period Debit ifrs-full:OtherAdjustmentsToReconcileProfitLoss
161 Adjustment for non-cash items (Sub-total) Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForReconcileProfitLoss
162 Changes in operating assets and liabilities Abstract kb:IncreaseDecreaseInWorkingCapitalAbstract
163 Financial asset at fair value through profit or loss Concept (Monetary) For Period Debit kb:AdjustmentsForDecreaseIncreaseInFinancialAssetsAtFairValueThroughProfitOrLoss
164 Derivative financial instruments Concept (Monetary) For Period Debit kb:AdjustmentsForDecreaseIncreaseInDerivativeFinancialInstruments
165 Loans Concept (Monetary) For Period Debit kb:AdjustmentsForDecreaseIncreaseInLoansAndReceivables
166 Current income tax assets Concept (Monetary) For Period Debit kb:AdjustmentsForDecreaseIncreaseInCurrentTaxAssets
167 Deferred income tax assets Concept (Monetary) For Period Debit kb:AdjustmentsForDecreaseIncreaseInDeferredTaxAssets
168 Other assets Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInOtherAssets
169 Financial liabilities at fair value through profit or loss Concept (Monetary) For Period Debit kb:AdjustmentsForIncreaseDecreaseInFinancialLiabilitiesAtFairValueThroughProfitOrLoss
170 Deposits Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncreaseDecreaseInDepositsFromCustomers
171 Deferred income tax liabilities Concept (Monetary) For Period Debit kb:AdjustmentsForIncreaseDecreaseInDeferredTaxLiabilities
172 Other liabilities Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncreaseDecreaseInOtherLiabilities
173 Changes in operating assets and liabilities (Sub-total) Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseInWorkingCapital
174 Net cash inflow (outflow) from operating activities Concept (Monetary) For Period ifrs-full:CashFlowsFromUsedInOperatingActivities
175 Cash flows from investing activities Abstract ifrs-full:CashFlowsFromUsedInInvestingActivitiesAbstract
176 Disposal of investments in associates and joint ventures Concept (Monetary) For Period Debit ifrs-full:ProceedsFromSalesOrMaturityOfFinancialInstrumentsClassifiedAsInvestingActivities
177 Acquisition of investments in associates and joint ventures Concept (Monetary) For Period Credit ifrs-full:PurchaseOfFinancialInstrumentsClassifiedAsInvestingActivities
178 Disposal of investments in associates and joint ventures Concept (Monetary) For Period Debit ifrs-full:ProceedsFromSalesOfInterestsInAssociates
179 Acquisition of investments in associates and joint ventures Concept (Monetary) For Period Credit ifrs-full:PurchaseOfInterestsInAssociates
180 Disposal of property and equipment Concept (Monetary) For Period Debit ifrs-full:ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities
181 Acquisition of property and equipment Concept (Monetary) For Period Credit ifrs-full:PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities
182 Disposal of investment property Concept (Monetary) For Period Debit ifrs-full:ProceedsFromSalesOfInvestmentProperty
183 Acquisition of investment property Concept (Monetary) For Period Credit ifrs-full:PurchaseOfInvestmentProperty
184 Disposal of intangible assets Concept (Monetary) For Period Debit ifrs-full:ProceedsFromSalesOfIntangibleAssetsClassifiedAsInvestingActivities
185 Acquisition of intangible assets Concept (Monetary) For Period Credit ifrs-full:PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities
186 Net cash flows from the change in subsidiaries Concept (Monetary) For Period Credit ifrs-full:CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities
187 Others Concept (Monetary) For Period Debit ifrs-full:OtherInflowsOutflowsOfCashClassifiedAsInvestingActivities
188 Net cash inflow (outflow) from investing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInInvestingActivities
189 Cash flows from financing activities Abstract ifrs-full:CashFlowsFromUsedInFinancingActivitiesAbstract
190 Net cash flows from derivative financial instrument for hedging purposes Concept (Monetary) For Period Debit kb:CashFlowsFromUsedInDerivativeFinancialInstrumentForHedgingPurposes
191 Net increase in debts Concept (Monetary) For Period Debit kb:CashFlowsFromUsedInIncreasesInDebts
192 Increase in debentures Concept (Monetary) For Period Debit ifrs-full:ProceedsFromIssueOfBondsNotesAndDebentures
193 Decrease in debentures Concept (Monetary) For Period Credit ifrs-full:RepaymentsOfBondsNotesAndDebentures
194 Increase in other payables from trust accounts Concept (Monetary) For Period Debit kb:CashFlowsFromUsedInIncreasesInTrustAccounts
195 Dividends paid to shareholders of the parent company Concept (Monetary) For Period Credit ifrs-full:DividendsPaidToEquityHoldersOfParentClassifiedAsFinancingActivities
196 Disposal of treasury shares Concept (Monetary) For Period Debit us-gaap:ProceedsFromSaleOfTreasuryStock
197 Proceeds From Sale Or Issue Of Treasury Shares Concept (Monetary) For Period Debit ifrs-full:ProceedsFromSaleOrIssueOfTreasuryShares
198 Acquisition of treasury shares Concept (Monetary) For Period Credit us-gaap:PaymentsForRepurchaseOfCommonStock
199 Payments to acquire or redeem entity's shares Concept (Monetary) For Period Credit ifrs-full:PaymentsToAcquireOrRedeemEntitysShares
200 Dividends paid to non-controlling interests Concept (Monetary) For Period Credit ifrs-full:DividendsPaidToNoncontrollingInterestsClassifiedAsFinancingActivities
201 Changes in interest in subsidiaries Concept (Monetary) For Period Credit ifrs-full:PaymentsFromChangesInOwnershipInterestsInSubsidiaries
202 Others Concept (Monetary) For Period Debit ifrs-full:OtherInflowsOutflowsOfCashClassifiedAsFinancingActivities
203 Net cash inflow (outflow) from financing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInFinancingActivities
204 Effect Of Exchange Rate Changes On Cash And Cash Equivalents Concept (Monetary) For Period Debit ifrs-full:EffectOfExchangeRateChangesOnCashAndCashEquivalents
205 Net increase (decrease) in cash and cash equivalents Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseInCashAndCashEquivalents
206 Cash and cash equivalents at the beginning of the year Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
207 Cash and cash equivalents at the end of the year Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
208 21010100 - Disclosure - Entity Information Network

*

*

 http://www.kbfg.com/role/EntityInformation
209 Implied Table Table

*

*

 implied:Table
210 Entity Information Abstract [Abstract] Abstract kb:EntityInformationAbstract
211 Disclosure Of Notes And Other Explanatory Information Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfNotesAndOtherExplanatoryInformationExplanatory
212 21020100 - Disclosure - Basis of Preparation Network

*

*

 http://www.kbfg.com/role/BasisofPreparation
213 Implied Table Table

*

*

 implied:Table
214 Basis Of Preparation Of Financial Statements Abstract [Abstract] Abstract kb:BasisOfPreparationOfFinancialStatementsAbstract
215 Disclosure Of Basis Of Preparation Of Financial Statements Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfBasisOfPreparationOfFinancialStatementsExplanatory
216 21030100 - Disclosure - Significant Accounting Policies Network

*

*

 http://www.kbfg.com/role/SignificantAccountingPolicies
217 Implied Table Table

*

*

 implied:Table
218 Accounting Policies Abstract [Abstract] Abstract us-gaap:AccountingPoliciesAbstract
219 Disclosure Of Summary Of Significant Accounting Policies Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory
220 21040100 - Disclosure - Financial Risk Management Network

*

*

 http://www.kbfg.com/role/FinancialRiskManagement
221 Implied Table Table

*

*

 implied:Table
222 Finacial Risk Management Abstract [Abstract] Abstract kb:FinacialRiskManagementAbstract
223 Disclosure Of Financial Risk Management Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinancialRiskManagementExplanatory
224 21050100 - Disclosure - Segment Information Network

*

*

 http://www.kbfg.com/role/SegmentInformation
225 Implied Table Table

*

*

 implied:Table
226 Disclosure Of Operating Segments Abstract [Abstract] Abstract ifrs-full:DisclosureOfOperatingSegmentsAbstract
227 Disclosure Of Entitys Reportable Segments Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfEntitysReportableSegmentsExplanatory
228 21060100 - Disclosure - Financial Assets and Financial Liabilities Network

*

*

 http://www.kbfg.com/role/FinancialAssetsAndFinancialLiabilities
229 Implied Table Table

*

*

 implied:Table
230 Disclosure Of Financial Instruments Abstract [Abstract] Abstract ifrs-full:DisclosureOfFinancialInstrumentsAbstract
231 Disclosure Of Financial Instruments Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinancialInstrumentsExplanatory
232 21070100 - Disclosure - Due from Financial Institutions Network

*

*

 http://www.kbfg.com/role/DuefromFinancialInstitutions
233 Implied Table Table

*

*

 implied:Table
234 Due From Financial Institution Abstract [Abstract] Abstract kb:DueFromFinancialInstitutionAbstract
235 Disclosure Of Cash And Bank Balances At Central Banks Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCashAndBankBalancesAtCentralBanksExplanatory
236 21080100 - Disclosure - Assets pledged as collateral Network

*

*

 http://www.kbfg.com/role/AssetsPledgedAsCollateral
237 Implied Table Table

*

*

 implied:Table
238 Pledged Assets Abstract [Abstract] Abstract kb:PledgedAssetsAbstract
239 Disclosure Of Collateral Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCollateralExplanatory
240 21090100 - Disclosure - Derivative Financial Instruments and Hedge Accounting Network

*

*

 http://www.kbfg.com/role/DerivativeFinancialInstrumentsAndHedgeAccounting
241 Implied Table Table

*

*

 implied:Table
242 Disclosure Of Hedge Accounting Abstract [Abstract] Abstract ifrs-full:DisclosureOfHedgeAccountingAbstract
243 Disclosure Of Hedge Accounting Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfHedgeAccountingExplanatory
244 21100100 - Disclosure - Loans Network

*

*

 http://www.kbfg.com/role/Loans
245 Implied Table Table

*

*

 implied:Table
246 Trade And Other Receivables Abstract [Abstract] Abstract ifrs-full:TradeAndOtherReceivablesAbstract
247 Disclosure Of Trade And Other Receivables Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfTradeAndOtherReceivablesExplanatory
248 21110100 - Disclosure - Allowances for Loan Losses Network

*

*

 http://www.kbfg.com/role/AllowancesforLoanLosses
249 Implied Table Table

*

*

 implied:Table
250 Reconciliation Of Changes In Allowance Account For Credit Losses Of Financial Assets Abstract [Abstract] Abstract ifrs-full:ReconciliationOfChangesInAllowanceAccountForCreditLossesOfFinancialAssetsAbstract
251 Disclosure Of Allowance For Credit Losses Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfAllowanceForCreditLossesExplanatory
252 21120100 - Disclosure - Financial Assets at Fair Value through Profit or Loss and Financial Investments Network

*

*

 http://www.kbfg.com/role/FinancialAssetsatFairValueThroughProfitorLossAndFinancialInvestments
253 Implied Table Table

*

*

 implied:Table
254 Financial Assets At Fair Value Through Profit Or Loss Abstract [Abstract] Abstract ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossAbstract
255 Disclosure Of Financial Assets At Fair Value Through Profit Or Loss Explanatory Concept (Text Block (HTML)) For Period kb:DisclosureOfFinancialAssetsAtFairValueThroughProfitOrLossExplanatory
256 21130100 - Disclosure - Investments in Associates and Joint Ventures Network

*

*

 http://www.kbfg.com/role/InvestmentsinAssociates
257 Implied Table Table

*

*

 implied:Table
258 Disclosure Of Significant Investments In Associates Abstract [Abstract] Abstract ifrs-full:DisclosureOfSignificantInvestmentsInAssociatesAbstract
259 Disclosure Of Significant Investments In Associates Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSignificantInvestmentsInAssociatesExplanatory
260 21140100 - Disclosure - Property and Equipment, and Investment Properties Network

*

*

 http://www.kbfg.com/role/PropertyandEquipmentandInvestmentProperties
261 Implied Table Table

*

*

 implied:Table
262 Disclosure Of Property Plant And Equipment And Investment Property Abstract [Abstract] Abstract kb:DisclosureOfPropertyPlantAndEquipmentAndInvestmentPropertyAbstract
263 Disclosure Of Property Plant And Equipment And Investment Property Explanatory Concept (Text Block (HTML)) For Period kb:DisclosureOfPropertyPlantAndEquipmentAndInvestmentPropertyExplanatory
264 21150100 - Disclosure - Intangible Assets Network

*

*

 http://www.kbfg.com/role/IntangibleAssets
265 Implied Table Table

*

*

 implied:Table
266 Disclosure Of Intangible Assets Abstract [Abstract] Abstract ifrs-full:DisclosureOfIntangibleAssetsAbstract
267 Disclosure Of Intangible Assets Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIntangibleAssetsExplanatory
268 21160100 - Disclosure - Deferred Income Tax Assets and Liabilities Network

*

*

 http://www.kbfg.com/role/DeferredIncomeTaxAssetsandLiabilities
269 Implied Table Table

*

*

 implied:Table
270 Net Deferred Tax Assets And Liabilities Abstract [Abstract] Abstract ifrs-full:NetDeferredTaxAssetsAndLiabilitiesAbstract
271 Disclosure Of Deferred Taxes Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDeferredTaxesExplanatory
272 21170100 - Disclosure - Assets Held for Sale Network

*

*

 http://www.kbfg.com/role/AssetsHeldforSale
273 Implied Table Table

*

*

 implied:Table
274 Noncurrent Assets Or Disposal Groups Classified As Held For Sale Or As Held For Distribution To Owners Abstract [Abstract] Abstract ifrs-full:NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSaleOrAsHeldForDistributionToOwnersAbstract
275 Disclosure Of Noncurrent Assets Or Disposal Groups Classified As Held For Sale Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfNoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSaleExplanatory
276 21180100 - Disclosure - Other Assets Network

*

*

 http://www.kbfg.com/role/OtherAssets
277 Implied Table Table

*

*

 implied:Table
278 Miscellaneous Assets Abstract [Abstract] Abstract ifrs-full:MiscellaneousAssetsAbstract
279 Disclosure Of Other Assets Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfOtherAssetsExplanatory
280 21190100 - Disclosure - Financial Liabilities at Fair Value through Profit or Loss Network

*

*

 http://www.kbfg.com/role/FinancialLiabilitiesatFairValuethroughProfitorLoss
281 Implied Table Table

*

*

 implied:Table
282 Financial Liabilities At Fair Value Through Profit Or Loss Abstract [Abstract] Abstract ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossAbstract
283 Disclosure Of Financial Liabilities At Fair Value Through Profit Or Loss Explanatory Concept (Text Block (HTML)) For Period kb:DisclosureOfFinancialLiabilitiesAtFairValueThroughProfitOrLossExplanatory
284 21200100 - Disclosure - Deposits Network

*

*

 http://www.kbfg.com/role/Deposits
285 Implied Table Table

*

*

 implied:Table
286 Deposits From Customers Abstract [Abstract] Abstract ifrs-full:DepositsFromCustomersAbstract
287 Disclosure Of Deposits From Customers Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDepositsFromCustomersExplanatory
288 21210100 - Disclosure - Debts Network

*

*

 http://www.kbfg.com/role/Debts
289 Implied Table Table

*

*

 implied:Table
290 Disclosure Of Detailed Information About Borrowings Abstract [Abstract] Abstract ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsAbstract
291 Disclosure Of Detailed Information About Borrowings Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsExplanatory
292 21220100 - Disclosure - Debentures Network

*

*

 http://www.kbfg.com/role/Debentures
293 Implied Table Table

*

*

 implied:Table
294 Disclosure Of Detailed Information About Debentures Abstract [Abstract] Abstract kb:DisclosureOfDetailedInformationAboutDebenturesAbstract
295 Disclosure Of Detailed Information About Debentures Explanatory Concept (Text Block (HTML)) For Period kb:DisclosureOfDetailedInformationAboutDebenturesExplanatory
296 21230100 - Disclosure - Provisions Network

*

*

 http://www.kbfg.com/role/Provisions
297 Implied Table Table

*

*

 implied:Table
298 Additional Provisions Other Provisions Abstract [Abstract] Abstract ifrs-full:AdditionalProvisionsOtherProvisionsAbstract
299 Disclosure Of Provisions Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfProvisionsExplanatory
300 21240100 - Disclosure - Net Defined Benefit Liabilities (Assets) Network

*

*

 http://www.kbfg.com/role/NetDefinedBenefitLiabilities
301 Implied Table Table

*

*

 implied:Table
302 Disclosure Of Defined Benefit Plans Abstract [Abstract] Abstract ifrs-full:DisclosureOfDefinedBenefitPlansAbstract
303 Disclosure Of Defined Benefit Plans Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDefinedBenefitPlansExplanatory
304 21250100 - Disclosure - Other Liabilities Network

*

*

 http://www.kbfg.com/role/OtherLiabilities
305 Implied Table Table

*

*

 implied:Table
306 Miscellaneous Liabilities Abstract [Abstract] Abstract ifrs-full:MiscellaneousLiabilitiesAbstract
307 Disclosure Of Other Liabilities Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfOtherLiabilitiesExplanatory
308 21260100 - Disclosure - Equity Network

*

*

 http://www.kbfg.com/role/Equity
309 Implied Table Table

*

*

 implied:Table
310 Equity Abstract [Abstract] Abstract ifrs-full:EquityAbstract
311 Disclosure Of Share Capital Reserves And Other Equity Interest Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatory
312 21270100 - Disclosure - Net Interest Income Network

*

*

 http://www.kbfg.com/role/NetInterestIncome
313 Implied Table Table

*

*

 implied:Table
314 Interest Revenue Or Expense Net Abstract [Abstract] Abstract us-gaap:InterestRevenueOrExpenseNetAbstract
315 Disclosure Of Interest Income Expense Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInterestIncomeExpenseExplanatory
316 21280100 - Disclosure - Net Fee and Commission Income Network

*

*

 http://www.kbfg.com/role/NetFeeandCommissionIncome
317 Implied Table Table

*

*

 implied:Table
318 Fee And Commission Income Expense Abstract [Abstract] Abstract ifrs-full:FeeAndCommissionIncomeExpenseAbstract
319 Disclosure Of Fee And Commission Income Expense Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFeeAndCommissionIncomeExpenseExplanatory
320 21290100 - Disclosure - Net Gains or Losses on Financial Assets_Liabilities at Fair Value Through Profit or Loss Network

*

*

 http://www.kbfg.com/role/NetGainsorLossesonFinancialAssetsLiabilitiesatFairValueThroughProfitorLoss
321 Implied Table Table

*

*

 implied:Table
322 Net Gains Or Losses On Financial Assets Liabilities At Fair Value Through Profit Or Loss Abstract [Abstract] Abstract kb:NetGainsOrLossesOnFinancialAssetsLiabilitiesAtFairValueThroughProfitOrLossAbstract
323 Net Gains Or Losses On Financial Assets Liabilities At Fair Value Through Profit Or Loss Explanatory Concept (Text Block (HTML)) For Period kb:NetGainsOrLossesOnFinancialAssetsLiabilitiesAtFairValueThroughProfitOrLossExplanatory
324 21300100 - Disclosure - Other Operating Income And Expenses Network

*

*

 http://www.kbfg.com/role/OtherOperatingIncomeandExpenses
325 Implied Table Table

*

*

 implied:Table
326 Other Operating Income And Expenses Abstract [Abstract] Abstract kb:OtherOperatingIncomeAndExpensesAbstract
327 Disclosure Of Other Operating Income Expense Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfOtherOperatingIncomeExpenseExplanatory
328 21310100 - Disclosure - General and Administrative Expenses Network

*

*

 http://www.kbfg.com/role/GeneralandAdministrativeExpenses
329 Implied Table Table

*

*

 implied:Table
330 General And Administrative Expense Abstract [Abstract] Abstract us-gaap:GeneralAndAdministrativeExpenseAbstract
331 Disclosure Of General And Administrative Expense Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfGeneralAndAdministrativeExpenseExplanatory
332 21320100 - Disclosure - Net Other NonOperating Income And Expenses Network

*

*

 http://www.kbfg.com/role/NetOtherNonOperatingIncomeAndExpenses
333 Implied Table Table

*

*

 implied:Table
334 Other Nonoperating Income Expense Abstract [Abstract] Abstract us-gaap:OtherNonoperatingIncomeExpenseAbstract
335 Other Nonoperating Income And Expense Text Block Concept (Text Block (HTML)) For Period us-gaap:OtherNonoperatingIncomeAndExpenseTextBlock
336 21330100 - Disclosure - Income Tax Expense Network

*

*

 http://www.kbfg.com/role/IncomeTaxExpense
337 Implied Table Table

*

*

 implied:Table
338 Major Components Of Tax Expense Income Abstract [Abstract] Abstract ifrs-full:MajorComponentsOfTaxExpenseIncomeAbstract
339 Disclosure Of Income Tax Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIncomeTaxExplanatory
340 21340100 - Disclosure - Dividends Network

*

*

 http://www.kbfg.com/role/Dividends
341 Implied Table Table

*

*

 implied:Table
342 Dividends Abstract [Abstract] Abstract us-gaap:DividendsAbstract
343 Disclosure Of Dividends Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDividendsExplanatory
344 21350100 - Disclosure - Accumulated Other Comprehensive Income Network

*

*

 http://www.kbfg.com/role/AccumulatedOtherComprehensiveIncome
345 Implied Table Table

*

*

 implied:Table
346 Disclosure Of Analysis Of Other Comprehensive Income By Item Abstract [Abstract] Abstract ifrs-full:DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemAbstract
347 Disclosure Of Analysis Of Other Comprehensive Income By Item Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemExplanatory
348 21360100 - Disclosure - Earnings Per Share Network

*

*

 http://www.kbfg.com/role/EarningsPerShare
349 Implied Table Table

*

*

 implied:Table
350 Earnings Per Share Abstract [Abstract] Abstract ifrs-full:EarningsPerShareAbstract
351 Disclosure Of Earnings Per Share Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfEarningsPerShareExplanatory
352 21370100 - Disclosure - Insurance Contracts Network

*

*

 http://www.kbfg.com/role/InsuranceContracts
353 Implied Table Table

*

*

 implied:Table
354 Disclosure Of Types Of Insurance Contracts Abstract [Abstract] Abstract ifrs-full:DisclosureOfTypesOfInsuranceContractsAbstract
355 Disclosure Of Insurance Contracts Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInsuranceContractsExplanatory
356 21380100 - Disclosure - Supplemental Cash Flow Information Network

*

*

 http://www.kbfg.com/role/SupplementalCashFlowInformation
357 Implied Table Table

*

*

 implied:Table
358 Statement Of Cash Flows Abstract [Abstract] Abstract ifrs-full:StatementOfCashFlowsAbstract
359 Disclosure Of Cash Flow Statement Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCashFlowStatementExplanatory
360 21390100 - Disclosure - Contingent Liabilities And Commitments Network

*

*

 http://www.kbfg.com/role/ContingentLiabilitiesAndCommitments
361 Implied Table Table

*

*

 implied:Table
362 Disclosure Of Contingent Liabilities Abstract [Abstract] Abstract ifrs-full:DisclosureOfContingentLiabilitiesAbstract
363 Disclosure Of Commitments And Contingent Liabilities Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCommitmentsAndContingentLiabilitiesExplanatory
364 21400100 - Disclosure - Subsidiaries Network

*

*

 http://www.kbfg.com/role/Subsidiaries
365 Implied Table Table

*

*

 implied:Table
366 Disclosure Of Significant Investments In Subsidiaries Abstract [Abstract] Abstract ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesAbstract
367 Disclosure Of Significant Investments In Subsidiaries Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesExplanatory
368 21410100 - Disclosure - Unconsolidated Structured Entity Network

*

*

 http://www.kbfg.com/role/UnconsolidatedStructuredEntity
369 Implied Table Table

*

*

 implied:Table
370 Disclosure Of Unconsolidated Structured Entities Abstract [Abstract] Abstract ifrs-full:DisclosureOfUnconsolidatedStructuredEntitiesAbstract
371 Disclosure Of Interests In Unconsolidated Structured Entities Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInterestsInUnconsolidatedStructuredEntitiesExplanatory
372 21420100 - Disclosure - Finance and Operating Lease Network

*

*

 http://www.kbfg.com/role/FinanceandOperatingLease
373 Implied Table Table

*

*

 implied:Table
374 Disclosure Of Finance Lease And Operating Lease By Lessee Abstract [Abstract] Abstract ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeAbstract
375 Disclosure Of Leases Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfLeasesExplanatory
376 21430100 - Disclosure - Related Party Transactions Network

*

*

 http://www.kbfg.com/role/RelatedPartyTransactions
377 Implied Table Table

*

*

 implied:Table
378 Disclosure Of Transactions Between Related Parties Abstract [Abstract] Abstract ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesAbstract
379 Disclosure Of Related Party Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfRelatedPartyExplanatory
380 21440100 - Disclosure - Business Combination Network

*

*

 http://www.kbfg.com/role/BusinessCombination
381 Implied Table Table

*

*

 implied:Table
382 Disclosure Of Business Combinations Abstract [Abstract] Abstract ifrs-full:DisclosureOfBusinessCombinationsAbstract
383 Disclosure Of Business Combinations Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfBusinessCombinationsExplanatory
384 21450100 - Disclosure - Approval Of Issuance Of The Financial Statements Network

*

*

 http://www.kbfg.com/role/ApprovalOfIssuanceOfTheFinancialStatements
385 Implied Table Table

*

*

 implied:Table
386 Authorisation Of Financial Statements Abstract Abstract kb:newItemAuthorisationOfFinancialStatementsAbstract
387 Disclosure Of Authorisation Of Financial Statements Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfAuthorisationOfFinancialStatementsExplanatory
388 21460100 - Disclosure - Parent Company Information Network

*

*

 http://www.kbfg.com/role/ParentCompanyInformation
389 Implied Table Table

*

*

 implied:Table
390 Condensed Financial Information Of Parent Company Only Disclosure Abstract [Abstract] Abstract us-gaap:CondensedFinancialInformationOfParentCompanyOnlyDisclosureAbstract
391 Condensed Financial Information Of Parent Company Only Disclosure Text Block Concept (Text Block (HTML)) For Period us-gaap:CondensedFinancialInformationOfParentCompanyOnlyDisclosureTextBlock
392 22030100 - Disclosure - Significant Accounting Policies (Policies) Network

*

*

 http://www.kbfg.com/role/SignificantAccountingPoliciesPolicies
393 Implied Table Table

*

*

 implied:Table
394 Accounting Policies Abstract [Abstract] Abstract us-gaap:AccountingPoliciesAbstract
395 Disclosure Of Basis Of Consolidation Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfBasisOfConsolidationExplanatory
396 Description Of Accounting Policy For Foreign Currency Translation Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory
397 Description Of Accounting Policy For Financial Instruments Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory
398 Description Of Accounting Policy To Determine Components Of Cash And Cash Equivalents Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyToDetermineComponentsOfCashAndCashEquivalents
399 Description Of Accounting Policy For Financial Assets Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForFinancialAssetsExplanatory
400 Description Of Accounting Policy For Impairment Of Financial Assets Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForImpairmentOfFinancialAssetsExplanatory
401 Description Of Accounting Policy For Derivative Financial Instruments Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForDerivativeFinancialInstrumentsExplanatory
402 Description Of Accounting Policy For Property Plant And Equipment Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory
403 Description Of Accounting Policy For Investment Property Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForInvestmentPropertyExplanatory
404 Description Of Accounting Policy For Intangible Assets And Goodwill Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForIntangibleAssetsAndGoodwillExplanatory
405 Description Of Accounting Policy For Leases Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForLeasesExplanatory
406 Description Of Accounting Policy For Emission Rights Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForEmissionRightsExplanatory
407 Description Of Accounting Policy For Impairment Of Nonfinancial Assets Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForImpairmentOfNonfinancialAssetsExplanatory
408 Description Of Accounting Policy For Noncurrent Assets Or Disposal Groups Classified As Held For Sale Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForNoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSaleExplanatory
409 Description Of Accounting Policy For Financial Instruments At Fair Value Through Profit Or Loss Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForFinancialInstrumentsAtFairValueThroughProfitOrLossExplanatory
410 Description Of Accounting Policy For Insurance Contracts Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForInsuranceContracts
411 Description Of Accounting Policy For Provisions Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForProvisionsExplanatory
412 Description Of Accounting Policy For Financial Guarantees Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForFinancialGuaranteesExplanatory
413 Description Of Accounting Policy For Issued Capital Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForIssuedCapitalExplanatory
414 Description Of Accounting Policy For Recognition Of Revenue Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForRecognitionOfRevenue
415 Description Of Accounting Policy For Employee Benefits Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForEmployeeBenefitsExplanatory
416 Description Of Accounting Policy For Income Tax Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForIncomeTaxExplanatory
417 Description Of Accounting Policy For Earnings Per Share Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForEarningsPerShareExplanatory
418 Description Of Accounting Policy For Segment Reporting Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForSegmentReportingExplanatory
419 Description Of Accounting Policy For Functional Currency Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForFunctionalCurrencyExplanatory
420 23020100 - Disclosure - Basis of Preparation(Table) Network

*

*

 http://www.kbfg.com/role/BasisofPreparationTables
421 Implied Table Table

*

*

 implied:Table
422 Basis Of Preparation Of Financial Statements Abstract [Abstract] Abstract kb:BasisOfPreparationOfFinancialStatementsAbstract
423 The Change In Classification And Measurement Of Financial Instrument Excluding Derivatives With Applying IFRS 9[Text Block] Concept (Text Block (HTML)) For Period kb:TheChangeInClassificationAndMeasurementOfFinancialInstrumentExcludingDerivativesWithApplyingIFRS9TableTextBlock
424 Under IFRS 9 According To The Financial Assessment The Group Owns Loss Allowance[Text Block] Concept (Text Block (HTML)) For Period kb:UnderIFRS9AccordingToTheFinancialAssessmentTheGroupOwnsLossAllowanceTableTextBlock
425 23030100 - Disclosure - Significant Accounting Policies(Table) Network

*

*

 http://www.kbfg.com/role/SignificantAccountingPoliciesTables
426 Implied Table Table

*

*

 implied:Table
427 Accounting Policies Abstract [Abstract] Abstract us-gaap:AccountingPoliciesAbstract
428 Property Plant And Equipment Text Block [Text Block] Concept (Text Block (HTML)) For Period us-gaap:PropertyPlantAndEquipmentTextBlock
429 Schedule Of Investment Property Table [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfInvestmentPropertyTableTextBlock
430 Schedule Of Finite Lived Intangible Assets Table Text Block [Text Block] Concept (Text Block (HTML)) For Period us-gaap:ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock
431 23040100 - Disclosure - Financial Risk Management (Table) Network

*

*

 http://www.kbfg.com/role/FinancialRiskManagementTables
432 Implied Table Table

*

*

 implied:Table
433 Finacial Risk Management Abstract [Abstract] Abstract kb:FinacialRiskManagementAbstract
434 Disclosure Of Credit Risk Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCreditRiskExplanatory
435 Schedule Of Loan Portfolio Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfLoanPortfolioTextBlock
436 Credit Quality Indicators Related To Companys Commercial Loans Consumer Loans And Credit Cards Loans Portfolio Segments Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:CreditQualityIndicatorsRelatedToCompanysCommercialLoansConsumerLoansAndCreditCardsLoansPortfolioSegmentsTableTextBlock
437 Analysis Of Credit Exposures Using Internal Credit Grading System Explanatory Concept (Text Block (HTML)) For Period ifrs-full:AnalysisOfCreditExposuresUsingInternalCreditGradingSystemExplanatory
438 Analysis Of Age Of Financial Assets That Are Past Due But Not Impaired Concept (Text Block (HTML)) For Period ifrs-full:AnalysisOfAgeOfFinancialAssetsThatArePastDueButNotImpaired
439 Impaired Financing Receivables Table Text Block [Text Block] Concept (Text Block (HTML)) For Period us-gaap:ImpairedFinancingReceivablesTableTextBlock
440 Information About Collateral Held As Security And Other Credit Enhancements For Creditimpaired Loan Explanatory Concept (Text Block (HTML)) For Period kb:InformationAboutCollateralHeldAsSecurityAndOtherCreditEnhancementsForCreditimpairedLoanExplanatory
441 Schedule Of Securities Portfolio Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfSecuritiesPortfolioTextBlock
442 Credit Quality Indicators Related To Securities Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:CreditQualityIndicatorsRelatedToSecuritiesTableTextBlock
443 Disclosure Of External Credit Exposures Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfExternalCreditExposuresExplanatory
444 Information About Collateral Held As Security And Other Credit Enhancements For Creditimpaired Derivative Financial Instruments Explanatory Concept (Text Block (HTML)) For Period kb:InformationAboutCollateralHeldAsSecurityAndOtherCreditEnhancementsForCreditimpairedDerivativeFinancialInstrumentsExplanatory
445 Schedule Of Details Of Regional Loans Concept (Text Block (HTML)) For Period kb:ScheduleOfDetailsOfRegionalLoans
446 Schedule Of Details Of Industrial Corporate Loans Concept (Text Block (HTML)) For Period kb:ScheduleOfDetailsOfIndustrialCorporateLoans
447 Schedule Of Types Of Retail And Credit Card Loans Concept (Text Block (HTML)) For Period kb:ScheduleOfTypesOfRetailAndCreditCardLoans
448 Schedule Of Details Of Industrial Securities And Derivative Financial Instruments Concept (Text Block (HTML)) For Period kb:ScheduleOfDetailsOfIndustrialSecuritiesAndDerivativeFinancialInstruments
449 Schedule Of Details Of Regional Securities And Derivative Financial Instruments By Country Concept (Text Block (HTML)) For Period kb:ScheduleOfDetailsOfRegionalSecuritiesAndDerivativeFinancialInstrumentsByCountry
450 Maturity Analysis For Financial Assets And Liabilities Excluding Derivative Held For Cash Flow Hedging Concept (Text Block (HTML)) For Period kb:MaturityAnalysisForFinancialAssetsAndLiabilitiesExcludingDerivativeHeldForCashFlowHedging
451 Analysis For Cash Flow Of Derivative Held For Cash Flow Hedging Concept (Text Block (HTML)) For Period kb:AnalysisForCashFlowOfDerivativeHeldForCashFlowHedging
452 Schedule Of Va R By Subsidiary Concept (Text Block (HTML)) For Period kb:ScheduleOfVaRBySubsidiary
453 Schedule Of Required Equity Capital Using The Standardized Method Related To The Positions Which Are Not Measured By Va R Or The Non Banking Subsidiaries Concept (Text Block (HTML)) For Period kb:ScheduleOfRequiredEquityCapitalUsingTheStandardizedMethodRelatedToThePositionsWhichAreNotMeasuredByVaROrTheNonBankingSubsidiaries
454 Measurement Of Interest Rate VaR Concept (Text Block (HTML)) For Period kb:MeasurementOfInterestRateVaR
455 Disclosure Of Effect Of Changes In Foreign Exchange Rates Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfEffectOfChangesInForeignExchangeRatesExplanatory
456 Disclosure Of Objectives Policies And Processes For Managing Capital Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalExplanatory
457 23050100 - Disclosure - Segment Information(Table) Network

*

*

 http://www.kbfg.com/role/SegmentInformationTables
458 Implied Table Table

*

*

 implied:Table
459 Disclosure Of Operating Segments Abstract [Abstract] Abstract ifrs-full:DisclosureOfOperatingSegmentsAbstract
460 Disclosure Of Operating Segments Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfOperatingSegmentsExplanatory
461 Disclosure Of Products And Services Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfProductsAndServicesExplanatory
462 Disclosure Of Geographical Areas Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfGeographicalAreasExplanatory
463 23060100 - Disclosure - Financial Assets and Financial Liabilities(Table) Network

*

*

 http://www.kbfg.com/role/FinancialAssetsAndFinancialLiabilitiesTables
464 Implied Table Table

*

*

 implied:Table
465 Disclosure Of Financial Instruments Abstract [Abstract] Abstract ifrs-full:DisclosureOfFinancialInstrumentsAbstract
466 Disclosure Of Fair Value Measurement Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFairValueMeasurementExplanatory
467 Fair Value Hierarchy Of Assets And Liabilities Measured At Fair Value Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:FairValueHierarchyOfAssetsAndLiabilitiesMeasuredAtFairValueTableTextBlock
468 Fair Value Measurement Inputs Of Assest And Liabilities Whose Fair Values Are Measured As Level2 Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:FairValueMeasurementInputsOfAssestAndLiabilitiesWhoseFairValuesAreMeasuredAsLevel2TableTextBlock
469 Fair Value Hierarchy Of Assets And Liabilities Whose Fair Values Are Disclosed Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:FairValueHierarchyOfAssetsAndLiabilitiesWhoseFairValuesAreDisclosedTableTextBlock
470 Fair Value Measurement Inputs Of Assest And Liabilities Whose Fair Values Are Disclosed And Classified As Level2 Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:FairValueMeasurementInputsOfAssestAndLiabilitiesWhoseFairValuesAreDisclosedAndClassifiedAsLevel2TableTextBlock
471 Fair Value Measurement Inputs Of Assest And Liabilities Whose Fair Values Are Disclosed And Classified As Level3 Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:FairValueMeasurementInputsOfAssestAndLiabilitiesWhoseFairValuesAreDisclosedAndClassifiedAsLevel3TableTextBlock
472 Schedule Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets And Liabilities Explanatory Concept (Text Block (HTML)) For Period kb:ScheduleOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsAndLiabilitiesExplanatory
473 Fair Value Assets And Liabilities Measured On Recurring Basis Gain Loss Included In Earnings Text Block [Text Block] Concept (Text Block (HTML)) For Period us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarningsTextBlock
474 Information About Fair Value Measurements Using Unobservable Inputs Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:InformationAboutFairValueMeasurementsUsingUnobservableInputsTableTextBlock
475 Fair Value Measurement Inputs Disclosure Text Block [Text Block] Concept (Text Block (HTML)) For Period us-gaap:FairValueMeasurementInputsDisclosureTextBlock
476 Reconciliation Of Aggregate Difference Yet To Be Recognized In Profit Or Loss Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ReconciliationOfAggregateDifferenceYetToBeRecognizedInProfitOrLossTableTextBlock
477 Carrying Amounts Of Financial Assets And Liabilities By Category Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:CarryingAmountsOfFinancialAssetsAndLiabilitiesByCategoryTableTextBlock
478 Disclosure Of Continuing Involvement In Derecognised Financial Assets Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfContinuingInvolvementInDerecognisedFinancialAssetsExplanatory
479 Disclosure Of Financial Assets Transferred During Period Which Do Not Qualify For Derecognition Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinancialAssetsTransferredDuringPeriodWhichDoNotQualifyForDerecognitionExplanatory
480 Disclosure Of Transfers Of Financial Assets Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfTransfersOfFinancialAssetsExplanatory
481 Disclosure Of Offsetting Of Financial Assets Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfOffsettingOfFinancialAssetsExplanatory
482 Disclosure Of Offsetting Of Financial Liabilities Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfOffsettingOfFinancialLiabilitiesExplanatory
483 23070100 - Disclosure - Due from Financial Institutions(Table) Network

*

*

 http://www.kbfg.com/role/DuefromFinancialInstitutionsTables
484 Implied Table Table

*

*

 implied:Table
485 Due From Financial Institution Abstract [Abstract] Abstract kb:DueFromFinancialInstitutionAbstract
486 Details Of Due From Financial Institutions Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:DetailsOfDueFromFinancialInstitutionsTextBlock
487 Disclosure Of Restricted Cash And Cash Equivalents Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfRestrictedCashAndCashEquivalentsExplanatory
488 23080100 - Disclosure - Assets Pledged As Collateral(Table) Network

*

*

 http://www.kbfg.com/role/AssetsPledgedAsCollateralTables
489 Implied Table Table

*

*

 implied:Table
490 Pledged Assets Abstract [Abstract] Abstract kb:PledgedAssetsAbstract
491 Schedule Of Assets Owned And Pledged As Collateral Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfAssetsOwnedAndPledgedAsCollateralTextBlock
492 Schedule Of Financial Instruments Owned And Pledged As Collateral Text Block [Text Block] Concept (Text Block (HTML)) For Period us-gaap:ScheduleOfFinancialInstrumentsOwnedAndPledgedAsCollateralTextBlock
493 23090100 - Disclosure - Derivative Financial Instruments and Hedge Accounting(Table) Network

*

*

 http://www.kbfg.com/role/DerivativeFinancialInstrumentsAndHedgeAccountingTables
494 Implied Table Table

*

*

 implied:Table
495 Disclosure Of Hedge Accounting Abstract [Abstract] Abstract ifrs-full:DisclosureOfHedgeAccountingAbstract
496 Schedule Of Detailed Information About Hedges Of Net Investment In Foreign Operations Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfDetailedInformationAboutHedgesOfNetInvestmentInForeignOperationsTableTextBlock
497 Schedule Of Information About Amounts That Affected Statement Of Comprehensive Income As Result Of Hedges Of Net Investment In Foreign Operations Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfInformationAboutAmountsThatAffectedStatementOfComprehensiveIncomeAsResultOfHedgesOfNetInvestmentInForeignOperationsTableTextBlock
498 Schedule Of Fair Value Of Non Derivative Financial Instruments Designated As Hedging Instruments Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfFairValueOfNonDerivativeFinancialInstrumentsDesignatedAsHedgingInstrumentsTableTextBlock
499 23100100 - Disclosure - Loans(Table) Network

*

*

 http://www.kbfg.com/role/LoansTables
500 Implied Table Table

*

*

 implied:Table
501 Trade And Other Receivables Abstract [Abstract] Abstract ifrs-full:TradeAndOtherReceivablesAbstract
502 Schedule Of Details Of Loans Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfDetailsOfLoansTableTextBlock
503 Schedule Of Details Of Loans For Other Banks Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfDetailsOfLoansForOtherBanksTableTextBlock
504 Schedule Of Details Of Loan Types And Customer Types Of Loans Other Than Banks Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfDetailsOfLoanTypesAndCustomerTypesOfLoansOtherThanBanksTableTextBlock
505 Schedule Of Changes In Deffered Loan Origination Fees And Costs Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfChangesInDefferedLoanOriginationFeesAndCostsTableTextBlock
506 23110100 - Disclosure - Allowances for Loan Losses(Table) Network

*

*

 http://www.kbfg.com/role/AllowancesForLoanLossesTables
507 Implied Table Table

*

*

 implied:Table
508 Reconciliation Of Changes In Allowance Account For Credit Losses Of Financial Assets Abstract [Abstract] Abstract ifrs-full:ReconciliationOfChangesInAllowanceAccountForCreditLossesOfFinancialAssetsAbstract
509 Allowance For Credit Losses On Financing Receivables Table Text Block [Text Block] Concept (Text Block (HTML)) For Period us-gaap:AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock
510 23120100 - Disclosure - Financial Assets At Fair Value Through Profit Or Loss And Financial Investments(Table) Network

*

*

 http://www.kbfg.com/role/FinancialAssetsatFairValuethroughProfitorLossAndFinancialInvestmentsTables
511 Implied Table Table

*

*

 implied:Table
512 Current Financial Assets At Fair Value Through Profit Or Loss Abstract [Abstract] Abstract ifrs-full:CurrentFinancialAssetsAtFairValueThroughProfitOrLossAbstract
513 Schedule Of Financial Assets At Fair Value Through Profit Or Loss And Financial Investments Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfFinancialAssetsAtFairValueThroughProfitOrLossAndFinancialInvestmentsTableTextBlock
514 Schedule Of Impairment Losses And Reversal In Financial Investments Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfImpairmentLossesAndReversalInFinancialInvestmentsTableTextBlock
515 23130100 - Disclosure - Investments in Associates and Joint Ventures(Table) Network

*

*

 http://www.kbfg.com/role/InvestmentsinAssociatesTables
516 Implied Table Table

*

*

 implied:Table
517 Disclosure Of Significant Investments In Associates Abstract [Abstract] Abstract ifrs-full:DisclosureOfSignificantInvestmentsInAssociatesAbstract
518 Disclosure Of Interests In Associates Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInterestsInAssociatesExplanatory
519 Disclosure Of Reconciliation Of Summarised Financial Information Of Associate Accounted For Using Equity Method To Carrying Amount Of Interest In Associate Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfReconciliationOfSummarisedFinancialInformationOfAssociateAccountedForUsingEquityMethodToCarryingAmountOfInterestInAssociateExplanatory
520 Schedule Of Changes Investments In Associates Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfChangesInvestmentsInAssociatesTextBlock
521 Schedule Of Accumulated Unrecognized Share Of Losses Investment In Associates Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfAccumulatedUnrecognizedShareOfLossesInvestmentInAssociatesTextBlock
522 23140100 - Disclosure - Property and Equipment And Investment Properties(Table) Network

*

*

 http://www.kbfg.com/role/PropertyandEquipmentAndInvestmentPropertiesTables
523 Implied Table Table

*

*

 implied:Table
524 Disclosure Of Property Plant And Equipment And Investment Property Abstract [Abstract] Abstract kb:DisclosureOfPropertyPlantAndEquipmentAndInvestmentPropertyAbstract
525 Disclosure Of Detailed Information About Property Plant And Equipment Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory
526 Schedule Of Movement In Property Plant And Equipment Roll Forward Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfMovementInPropertyPlantAndEquipmentRollForwardTextBlock
527 Schedule Of Impairment Of Property Plant And Equipment Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfImpairmentOfPropertyPlantAndEquipmentTextBlock
528 Disclosure Of Detailed Information About Investment Property Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutInvestmentPropertyExplanatory
529 Schedule Of Fair Value Of Investment Property Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfFairValueOfInvestmentPropertyTextBlock
530 Schedule Of Movement In Investment Property Roll Forward Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfMovementInInvestmentPropertyRollForwardTextBlock
531 23150100 - Disclosure - Intangible Assets(Table) Network

*

*

 http://www.kbfg.com/role/IntangibleAssetsTables
532 Implied Table Table

*

*

 implied:Table
533 Disclosure Of Intangible Assets Abstract [Abstract] Abstract ifrs-full:DisclosureOfIntangibleAssetsAbstract
534 Disclosure Of Intangible Assets And Goodwill Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIntangibleAssetsAndGoodwillExplanatory
535 Disclosure Of Goodwill Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfGoodwillExplanatory
536 Schedule Of Changes In Accumulated Impairment Losses Of Goodwill Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfChangesInAccumulatedImpairmentLossesOfGoodwillTableTextBlock
537 Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInformationForEachMaterialImpairmentLossRecognisedOrReversedForIndividualAssetOrCashgeneratingUnitExplanatory
538 Disclosure Of Detailed Information About Intangible Assets Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutIntangibleAssetsExplanatory
539 Intangible Assets Disclosure Text Block [Text Block] Concept (Text Block (HTML)) For Period us-gaap:IntangibleAssetsDisclosureTextBlock
540 Schedule Of Changes In Accumulated Impairment Losses On Intangible Asset Excluding Goodwill Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfChangesInAccumulatedImpairmentLossesOnIntangibleAssetExcludingGoodwillTableTextBlock
541 Schedule Of Changes In Emissions Rights Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfChangesInEmissionsRightsTableTextBlock
542 23160100 - Disclosure - Deferred Income Tax Assets And Liabilities(Table) Network

*

*

 http://www.kbfg.com/role/DeferredIncomeTaxAssetsAndLiabilitiesTables
543 Implied Table Table

*

*

 implied:Table
544 Deferred Tax Assets And Liabilities Abstract [Abstract] Abstract ifrs-full:DeferredTaxAssetsAndLiabilitiesAbstract
545 Schedule Of Deferred Tax Assets And Liabilities Table Text Block [Text Block] Concept (Text Block (HTML)) For Period us-gaap:ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock
546 Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsExplanatory
547 23170100 - Disclosure - Assets Held For Sale(Table) Network

*

*

 http://www.kbfg.com/role/AssetsHeldForSaleTables
548 Implied Table Table

*

*

 implied:Table
549 Disclosure Of Assets Held For Sale Abstract [Abstract] Abstract kb:DisclosureOfAssetsHeldForSaleAbstract
550 Schedule Of Assets Held For Sale Concept (Text Block (HTML)) For Period kb:ScheduleOfAssetsHeldForSale
551 Fair Value Measurement Inputs Of Assets Held Forsale Whose Fair Values Are Measured Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:FairValueMeasurementInputsOfAssetsHeldForsaleWhoseFairValuesAreMeasuredTableTextBlock
552 Schedule Of Changesin Accumulated Impairment Losses Of Assets Held Forsale Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfChangesinAccumulatedImpairmentLossesOfAssetsHeldForsaleTableTextBlock
553 23180100 - Disclosure - Other Assets(Table) Network

*

*

 http://www.kbfg.com/role/OtherAssetsTables
554 Implied Table Table

*

*

 implied:Table
555 Miscellaneous Assets Abstract [Abstract] Abstract ifrs-full:MiscellaneousAssetsAbstract
556 Disclosure Of Prepayments And Other Assets Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfPrepaymentsAndOtherAssetsExplanatory
557 Schedule Of Changes In Allowance For Loan Losses On Other Assets Concept (Text Block (HTML)) For Period kb:ScheduleOfChangesInAllowanceForLoanLossesOnOtherAssets
558 23190100 - Disclosure - Financial Liabilities At Fair Value Through Profit Or Loss(Table) Network

*

*

 http://www.kbfg.com/role/FinancialLiabilitiesAtFairValueThroughProfitOrLossTables
559 Implied Table Table

*

*

 implied:Table
560 Current Financial Liabilities At Fair Value Through Profit Or Loss Abstract [Abstract] Abstract ifrs-full:CurrentFinancialLiabilitiesAtFairValueThroughProfitOrLossAbstract
561 Schedule Of Financial Liabilities At Fair Value Through Profit Or Loss Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfFinancialLiabilitiesAtFairValueThroughProfitOrLossTableTextBlock
562 Schedule Of Changes In Fair Value Of Financial Liability Attributable To Changes In Credit Risk Of Liability Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfChangesInFairValueOfFinancialLiabilityAttributableToChangesInCreditRiskOfLiabilityTableTextBlock
563 23200100 - Disclosure - Deposits(Table) Network

*

*

 http://www.kbfg.com/role/DepositsTables
564 Implied Table Table

*

*

 implied:Table
565 Deposits From Customers Abstract [Abstract] Abstract ifrs-full:DepositsFromCustomersAbstract
566 Deposit Liabilities Type Table Text Block [Text Block] Concept (Text Block (HTML)) For Period us-gaap:DepositLiabilitiesTypeTableTextBlock
567 23210100 - Disclosure - Debts(Table) Network

*

*

 http://www.kbfg.com/role/DebtsTables
568 Implied Table Table

*

*

 implied:Table
569 Disclosure Of Detailed Information About Borrowings Abstract [Abstract] Abstract ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsAbstract
570 Schedule Of Debt Table Text Block [Text Block] Concept (Text Block (HTML)) For Period us-gaap:ScheduleOfDebtTableTextBlock
571 Schedule Of Details Of Borrowings Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfDetailsOfBorrowingsTableTextBlock
572 Schedule Of Repurchase Agreements Concept (Text Block (HTML)) For Period us-gaap:ScheduleOfRepurchaseAgreements
573 Schedule Of Details Of Call Money Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfDetailsOfCallMoneyTableTextBlock
574 23220100 - Disclosure - Debentures(Table) Network

*

*

 http://www.kbfg.com/role/DebenturesTables
575 Implied Table Table

*

*

 implied:Table
576 Disclosure Of Detailed Information About Debentures Abstract [Abstract] Abstract kb:DisclosureOfDetailedInformationAboutDebenturesAbstract
577 Schedule Of Details Of Debentures Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfDetailsOfDebenturesTableTextBlock
578 Schedule Of Changes In Debentures Based On Face Value Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfChangesInDebenturesBasedOnFaceValueTableTextBlock
579 23230100 - Disclosure - Provisions(Table) Network

*

*

 http://www.kbfg.com/role/ProvisionsTables
580 Implied Table Table

*

*

 implied:Table
581 Provisions Abstract [Abstract] Abstract ifrs-full:ProvisionsAbstract
582 Disclosure Of Other Provisions Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfOtherProvisionsExplanatory
583 Schedule Of Reconciliation Of Changes In Provisions For Unused Loan Commitments And Payment Guarantee Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfReconciliationOfChangesInProvisionsForUnusedLoanCommitmentsAndPaymentGuaranteeTableTextBlock
584 Schedule Of Reconciliation Of Changes In Provisions For Financial Guarantee Contracts Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfReconciliationOfChangesInProvisionsForFinancialGuaranteeContractsTableTextBlock
585 Schedule Of Reconciliation Of Changes In Provisions For Restoration Cost Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfReconciliationOfChangesInProvisionsForRestorationCostTableTextBlock
586 Schedule Of Reconciliation Of Changes In Other Provisions Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfReconciliationOfChangesInOtherProvisionsTableTextBlock
587 23240100 - Disclosure - Net Defined Benefit Liabilities And Assets (Table) Network

*

*

 http://www.kbfg.com/role/NetDefinedBenefitLiabilitiesTables
588 Implied Table Table

*

*

 implied:Table
589 Disclosure Of Defined Benefit Plans Abstract [Abstract] Abstract ifrs-full:DisclosureOfDefinedBenefitPlansAbstract
590 Schedule Of Defined Benefit Plans Disclosures Text Block [Text Block] Concept (Text Block (HTML)) For Period us-gaap:ScheduleOfDefinedBenefitPlansDisclosuresTextBlock
591 Disclosure Of Net Defined Benefit Liability Asset Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfNetDefinedBenefitLiabilityAssetExplanatory
592 Schedule Of Net Benefit Costs Table Text Block [Text Block] Concept (Text Block (HTML)) For Period us-gaap:ScheduleOfNetBenefitCostsTableTextBlock
593 Schedule Of Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Loss Table Text Block [Text Block] Concept (Text Block (HTML)) For Period us-gaap:ScheduleOfDefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossTableTextBlock
594 Disclosure Of Fair Value Of Plan Assets Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFairValueOfPlanAssetsExplanatory
595 Schedule Of Assumptions Used Table Text Block [Text Block] Concept (Text Block (HTML)) For Period us-gaap:ScheduleOfAssumptionsUsedTableTextBlock
596 Disclosure Of Sensitivity Analysis For Actuarial Assumptions Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSensitivityAnalysisForActuarialAssumptionsExplanatory
597 Disclosure Of Information About Maturity Profile Of Defined Benefit Obligation Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInformationAboutMaturityProfileOfDefinedBenefitObligationExplanatory
598 23250100 - Disclosure - Other Liabilities(Table) Network

*

*

 http://www.kbfg.com/role/OtherLiabilitiesTables
599 Implied Table Table

*

*

 implied:Table
600 Miscellaneous Liabilities Abstract [Abstract] Abstract ifrs-full:MiscellaneousLiabilitiesAbstract
601 Disclosure Of Accrued Expenses And Other Liabilities Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfAccruedExpensesAndOtherLiabilitiesExplanatory
602 23260100 - Disclosure - Equity(Table) Network

*

*

 http://www.kbfg.com/role/EquityTables
603 Implied Table Table

*

*

 implied:Table
604 Equity Abstract [Abstract] Abstract ifrs-full:EquityAbstract
605 Disclosure Of Issued Capital Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIssuedCapitalExplanatory
606 Schedule Of Common Stock Outstanding Roll Forward Table Text Block [Text Block] Concept (Text Block (HTML)) For Period us-gaap:ScheduleOfCommonStockOutstandingRollForwardTableTextBlock
607 Disclosure Of Reserves And Other Equity Interest Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfReservesAndOtherEquityInterestExplanatory
608 Schedule Of Accumulated Other Comprehensive Income Loss Table Text Block [Text Block] Concept (Text Block (HTML)) For Period us-gaap:ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock
609 Schedule Of Appropriated And Unappropriated Retained Earnings Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfAppropriatedAndUnappropriatedRetainedEarningsTableTextBlock
610 Disclosure Of Treasury Shares Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfTreasurySharesExplanatory
611 23270100 - Disclosure - Net Interest Income(Table) Network

*

*

 http://www.kbfg.com/role/NetInterestIncomeTables
612 Implied Table Table

*

*

 implied:Table
613 Interest Revenue Or Expense Net Abstract [Abstract] Abstract us-gaap:InterestRevenueOrExpenseNetAbstract
614 Interest Income And Interest Expense Disclosure Table Text Block [Text Block] Concept (Text Block (HTML)) For Period us-gaap:InterestIncomeAndInterestExpenseDisclosureTableTextBlock
615 23280100 - Disclosure - Net Fee And Commission Income(Table) Network

*

*

 http://www.kbfg.com/role/NetFeeAndCommissionIncomeTables
616 Implied Table Table

*

*

 implied:Table
617 Fee And Commission Income Expense Abstract [Abstract] Abstract ifrs-full:FeeAndCommissionIncomeExpenseAbstract
618 Schedule Of Details Of Fee And Commission Income And Expense Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfDetailsOfFeeAndCommissionIncomeAndExpenseTableTextBlock
619 23290100 - Disclosure - Net Gains Or Losses On Financial Assets_Liabilities At Fair Value Through Profit Or Loss(Table) Network

*

*

 http://www.kbfg.com/role/NetGainsOrLossesOnFinancialAssetsLiabilitiesAtFairValueThroughProfitorLossTables
620 Implied Table Table

*

*

 implied:Table
621 Net Gains Or Losses On Financial Assets Liabilities At Fair Value Through Profit Or Loss Abstract [Abstract] Abstract kb:NetGainsOrLossesOnFinancialAssetsLiabilitiesAtFairValueThroughProfitOrLossAbstract
622 Schedule Of Net Gains Or Losses On Financial Instruments Held For Trading Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfNetGainsOrLossesOnFinancialInstrumentsHeldForTradingTableTextBlock
623 Schedule Of Net Gains Or Losses On Financial Instruments Designated At Fair Value Through Profit Or Loss Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfNetGainsOrLossesOnFinancialInstrumentsDesignatedAtFairValueThroughProfitOrLossTableTextBlock
624 23300100 - Disclosure - Other Operating Income And Expenses(Table) Network

*

*

 http://www.kbfg.com/role/OtherOperatingIncomeAndExpensesTables
625 Implied Table Table

*

*

 implied:Table
626 Other Operating Income And Expenses Abstract [Abstract] Abstract kb:OtherOperatingIncomeAndExpensesAbstract
627 Other Operating Income And Expense Text Block [Text Block] Concept (Text Block (HTML)) For Period us-gaap:OtherOperatingIncomeAndExpenseTextBlock
628 23310100 - Disclosure - General And Administrative Expenses(Table) Network

*

*

 http://www.kbfg.com/role/GeneralAndAdministrativeExpensesTables
629 Implied Table Table

*

*

 implied:Table
630 General And Administrative Expense Abstract [Abstract] Abstract us-gaap:GeneralAndAdministrativeExpenseAbstract
631 Schedule Of Details Of General And Administrative Expense Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfDetailsOfGeneralAndAdministrativeExpenseTableTextBlock
632 Schedule Of Details Of Stock Grants Linked To Long Term Performance Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfDetailsOfStockGrantsLinkedToLongTermPerformanceTableTextBlock
633 Schedule Of Details Of Stock Grants Linked To Short Term Performance Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfDetailsOfStockGrantsLinkedToShortTermPerformanceTableTextBlock
634 Schedule Of Share Grants Measured At Fair Value Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfShareGrantsMeasuredAtFairValueTableTextBlock
635 Schedule Of Details Of Mileage Stock Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfDetailsOfMileageStockTableTextBlock
636 23320100 - Disclosure - Net Other Non-operating Income and Expenses(Table) Network

*

*

 http://www.kbfg.com/role/NetOtherNonOperatingIncomeandExpensesTables
637 Implied Table Table

*

*

 implied:Table
638 Other Nonoperating Income Expense Abstract [Abstract] Abstract us-gaap:OtherNonoperatingIncomeExpenseAbstract
639 Schedule Of Other Nonoperating Income Expense Table Text Block [Text Block] Concept (Text Block (HTML)) For Period us-gaap:ScheduleOfOtherNonoperatingIncomeExpenseTableTextBlock
640 23330100 - Disclosure - Income Tax Expense(Table) Network

*

*

 http://www.kbfg.com/role/IncomeTaxExpenseTables
641 Implied Table Table

*

*

 implied:Table
642 Major Components Of Tax Expense Income Abstract [Abstract] Abstract ifrs-full:MajorComponentsOfTaxExpenseIncomeAbstract
643 Schedule Of Components Of Income Tax Expense Benefit Table Text Block [Text Block] Concept (Text Block (HTML)) For Period us-gaap:ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock
644 Schedule Of Effective Income Tax Rate Reconciliation Table Text Block [Text Block] Concept (Text Block (HTML)) For Period us-gaap:ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock
645 Schedule Of Details Of Current Tax Assets And Liabilities Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfDetailsOfCurrentTaxAssetsAndLiabilitiesTableTextBlock
646 23350100 - Disclosure - Accumulated Other Comprehensive Income(Table) Network

*

*

 http://www.kbfg.com/role/AccumulatedOtherComprehensiveIncomeTables
647 Implied Table Table

*

*

 implied:Table
648 Disclosure Of Analysis Of Other Comprehensive Income By Item Abstract [Abstract] Abstract ifrs-full:DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemAbstract
649 Schedule Of Changes Of Accumulated Other Comprehensive Income Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfChangesOfAccumulatedOtherComprehensiveIncomeTableTextBlock
650 23360100 - Disclosure - Earnings Per Share(Table) Network

*

*

 http://www.kbfg.com/role/EarningsPerShareTables
651 Implied Table Table

*

*

 implied:Table
652 Earnings Per Share Abstract [Abstract] Abstract ifrs-full:EarningsPerShareAbstract
653 Schedule Of Weighted Average Number Of Shares Table Text Block [Text Block] Concept (Text Block (HTML)) For Period us-gaap:ScheduleOfWeightedAverageNumberOfSharesTableTextBlock
654 Schedule Of Earnings Per Share Basic By Common Class Text Block [Text Block] Concept (Text Block (HTML)) For Period us-gaap:ScheduleOfEarningsPerShareBasicByCommonClassTextBlock
655 Schedule Of Adjusted Profit For Diluted Earnings Per Share Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfAdjustedProfitForDilutedEarningsPerShareTableTextBlock
656 Schedule Of Adjusted Weighted Average Number Of Shares For Diluted Earnings Per Share Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfAdjustedWeightedAverageNumberOfSharesForDilutedEarningsPerShareTableTextBlock
657 Schedule Of Earnings Per Share Diluted By Common Class Text Block [Text Block] Concept (Text Block (HTML)) For Period us-gaap:ScheduleOfEarningsPerShareDilutedByCommonClassTextBlock
658 23370100 - Disclosure - Insurance Contracts(Table) Network

*

*

 http://www.kbfg.com/role/InsuranceContractsTables
659 Implied Table Table

*

*

 implied:Table
660 Disclosure Of Types Of Insurance Contracts Abstract [Abstract] Abstract ifrs-full:DisclosureOfTypesOfInsuranceContractsAbstract
661 Disclosure of deferred acquisition costs arising from insurance contracts [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDeferredAcquisitionCostsArisingFromInsuranceContractsExplanatory
662 Schedule of changes in the deferred acquisition costs arising from insurance contracts [text block] Concept (Text Block (HTML)) For Period kb:ScheduleOfChangesInTheDeferredAcquisitionCostsArisingFromInsuranceContractsTextBlock
663 Disclosure of reinsurance [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfReinsuranceExplanatory
664 Schedule of changes in reinsurance assets included in other assets [text block] Concept (Text Block (HTML)) For Period kb:ScheduleOfChangesInReinsuranceAssetsIncludedInOtherAssetsTextBlock
665 Disclosure of details of insurance liabilities [text block] Concept (Text Block (HTML)) For Period kb:DisclosureOfDetailsOfInsuranceLiabilitiesTextBlock
666 Schedule of changes in insurance liabilities [text block] Concept (Text Block (HTML)) For Period kb:ScheduleOfChangesInInsuranceLiabilitiesTextBlock
667 Disclosure of Assumptions and basis for the nonlife insurance liability adequacy test [text block] Concept (Text Block (HTML)) For Period kb:DisclosureOfAssumptionsAndBasisForTheNonlifeInsuranceLiabilityAdequacyTestTextBlock
668 Disclosure of results of nonlife insurance liability adequacy test [text block] Concept (Text Block (HTML)) For Period kb:DisclosureOfResultsOfNonlifeInsuranceLiabilityAdequacyTestTextBlock
669 Disclosure of Assumptions and basis for life insurance liability adequacy test [text block] Concept (Text Block (HTML)) For Period kb:DisclosureOfAssumptionsAndBasisForLifeInsuranceLiabilityAdequacyTestTextBlock
670 Disclosure of results of life insurance liability adequacy test [text block] Concept (Text Block (HTML)) For Period kb:DisclosureOfResultsOfLifeInsuranceLiabilityAdequacyTestTextBlock
671 Schedule of Insurance income and expenses [text block] Concept (Text Block (HTML)) For Period kb:ScheduleOfInsuranceIncomeAndExpensesTextBlock
672 Disclosure of exposure to nonlife insurance price risk [text block] Concept (Text Block (HTML)) For Period kb:DisclosureOfExposureToNonlifeInsurancePriceRiskTextBlock
673 Schedule of loss development tables for general Insurance [text block] Concept (Text Block (HTML)) For Period kb:ScheduleOfLossDevelopmentTablesForGeneralInsuranceTextBlock
674 Schedule of loss development tables for automobile Insurance [text block] Concept (Text Block (HTML)) For Period kb:DisclosureOfLossDevelopmentTablesForAutomobileInsuranceTextBlock
675 Schedule of loss development tables for long term Insurance [text block] Concept (Text Block (HTML)) For Period kb:ScheduleOfLossDevelopmentTablesForLongtermInsuranceTextBlock
676 Disclosure of sensitivity to insurance risk [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSensitivityToInsuranceRiskExplanatory
677 Schedule of maturity structure of premium reserve related to liquidity risk [text block] Concept (Text Block (HTML)) For Period kb:ScheduleOfMaturityStructureOfPremiumReserveRelatedToLiquidityRiskTextBlock
678 Disclosure of concentration and credit ratings for the top three reinsurance companies that deal with the group [text block] Concept (Text Block (HTML)) For Period kb:DisclosureOfConcentrationAndCreditRatingsForTheTopThreeReinsuranceCompaniesThatDealWithTheGroupTextBlock
679 Disclosure of exposures to credit risk related to reinsurance [text block] Concept (Text Block (HTML)) For Period kb:DisclosureOfExposuresToCreditRiskRelatedToReinsuranceTextBlock
680 Disclosure of exposure to interest rate risk of insurance contract [text block] Concept (Text Block (HTML)) For Period kb:DisclosureOfExposureToInterestRateRiskOfInsuranceContractTextBlock
681 Disclosure of maximum exposures to life insurance price risk [text block] Concept (Text Block (HTML)) For Period kb:DisclosureOfMaximumExposuresToLifeInsurancePriceRiskTextBlock
682 Disclosure of exposure of market risk arising from embedded derivatives included in host insurance contracts [text block] Concept (Text Block (HTML)) For Period kb:DisclosureOfExposureOfMarketRiskArisingFromEmbeddedDerivativesIncludedInHostInsuranceContractsTextBlock
683 Schedule of premium reserves and unearned premium reserves classified based on each residual maturity [text block] Concept (Text Block (HTML)) For Period kb:ScheduleOfPremiumReservesAndUnearnedPremiumReservesClassifiedBasedOnEachResidualMaturityTextBlock
684 23380100 - Disclosure - Supplemental Cash Flow Information(Table) Network

*

*

 http://www.kbfg.com/role/SupplementalCashFlowInformationTables
685 Implied Table Table

*

*

 implied:Table
686 Statement Of Cash Flows Abstract [Abstract] Abstract ifrs-full:StatementOfCashFlowsAbstract
687 Disclosure Of Cash And Cash Equivalents Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCashAndCashEquivalentsExplanatory
688 Schedule Of Other Significant Noncash Transactions Text Block [Text Block] Concept (Text Block (HTML)) For Period us-gaap:ScheduleOfOtherSignificantNoncashTransactionsTextBlock
689 Schedule Of Cash Flow Supplemental Disclosures Table Text Block [Text Block] Concept (Text Block (HTML)) For Period us-gaap:ScheduleOfCashFlowSupplementalDisclosuresTableTextBlock
690 Disclosure of reconciliation of liabilities arising from financing activities [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesExplanatory
691 23390100 - Disclosure - Contingent Liabilities And Commitments(Table) Network

*

*

 http://www.kbfg.com/role/ContingentLiabilitiesandCommitmentsTables
692 Implied Table Table

*

*

 implied:Table
693 Disclosure Of Contingent Liabilities Abstract [Abstract] Abstract ifrs-full:DisclosureOfContingentLiabilitiesAbstract
694 Schedule Of Guarantee Obligations Text Block [Text Block] Concept (Text Block (HTML)) For Period us-gaap:ScheduleOfGuaranteeObligationsTextBlock
695 Schedule Of Acceptance And Guarantees By Counterparty Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfAcceptanceAndGuaranteesByCounterpartyTableTextBlock
696 Schedule Of Acceptance And Guarantees By Industry Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfAcceptanceAndGuaranteesByIndustryTableTextBlock
697 Disclosure Of Commitments Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCommitmentsExplanatory
698 23400100 - Disclosure - Subsidiaries(Table) Network

*

*

 http://www.kbfg.com/role/SubsidiariesTables
699 Implied Table Table

*

*

 implied:Table
700 Disclosure Of Significant Investments In Subsidiaries Abstract [Abstract] Abstract ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesAbstract
701 Disclosure Of Interests In Subsidiaries Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInterestsInSubsidiariesExplanatory
702 Schedule Of Condensed Financial Information Of Subsidiaries Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfCondensedFinancialInformationOfSubsidiariesTableTextBlock
703 Disclosure Of Changes In Subsidiaries [Text Block] Concept (Text Block (HTML)) For Period kb:DisclosureOfChangesInSubsidiariesTextBlock
704 Schedule Of Material Non Controlling Interests Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfMaterialNonControllingInterestsTableTextBlock
705 23410100 - Disclosure - Unconsolidated Structured Entity(Table) Network

*

*

 http://www.kbfg.com/role/UnconsolidatedStructuredEntityTables
706 Implied Table Table

*

*

 implied:Table
707 Disclosure Of Unconsolidated Structured Entities Abstract [Abstract] Abstract ifrs-full:DisclosureOfUnconsolidatedStructuredEntitiesAbstract
708 Disclosure Of Nature Purpose Activity Method Of Financing Of The Unconsolidated Structured Entities [Text Block] Concept (Text Block (HTML)) For Period kb:DisclosureOfNaturePurposeActivityMethodOfFinancingOfTheUnconsolidatedStructuredEntitiesTextBlock
709 Disclosure Of Unconsolidated Structured Entities Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfUnconsolidatedStructuredEntitiesExplanatory
710 23420100 - Disclosure - Finance and Operating Lease(Table) Network

*

*

 http://www.kbfg.com/role/FinanceAndOperatingLeaseTables
711 Implied Table Table

*

*

 implied:Table
712 Disclosure Of Finance Lease And Operating Lease By Lessee Abstract [Abstract] Abstract ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeAbstract
713 Schedule Of Future Minimum Finance Lease Payments Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfFutureMinimumFinanceLeasePaymentsTableTextBlock
714 Schedule Of Gross Investment In Finance Lease And Minimum Finance Lease Payments Receivable At Present Value Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfGrossInvestmentInFinanceLeaseAndMinimumFinanceLeasePaymentsReceivableAtPresentValueTableTextBlock
715 Schedule Of Unearned Finance Income On Finance Lease Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfUnearnedFinanceIncomeOnFinanceLeaseTableTextBlock
716 Schedule Of Future Minimum Lease Payments Payable Under Noncancellable Operating Lease Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfFutureMinimumLeasePaymentsPayableUnderNoncancellableOperatingLeaseTableTextBlock
717 Schedule Of Lease And Sublease Payments Recognised As Expense Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfLeaseAndSubleasePaymentsRecognisedAsExpenseTableTextBlock
718 Schedule Of Minimum Lease Payments Receivable Under Noncancellable Operating Lease Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfMinimumLeasePaymentsReceivableUnderNoncancellableOperatingLeaseTableTextBlock
719 23430100 - Disclosure - Related Party Transactions(Table) Network

*

*

 http://www.kbfg.com/role/RelatedPartyTransactionsTables
720 Implied Table Table

*

*

 implied:Table
721 Disclosure Of Transactions Between Related Parties Abstract [Abstract] Abstract ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesAbstract
722 Schedule Of Profit And Loss Arising From Related Party Transactions Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfProfitAndLossArisingFromRelatedPartyTransactionsTableTextBlock
723 Schedule Of Outstanding Balances For Related Party Transactions Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfOutstandingBalancesForRelatedPartyTransactionsTableTextBlock
724 Schedule Of Significant Loan Transactions With Related Parties Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfSignificantLoanTransactionsWithRelatedPartiesTableTextBlock
725 Schedule Of Commitments Made On Behalf Of Entity Related Party Transactions Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfCommitmentsMadeOnBehalfOfEntityRelatedPartyTransactionsTableTextBlock
726 Schedule Of Key Management Personnel Compensation Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfKeyManagementPersonnelCompensationTableTextBlock
727 Schedule Of Provision Of Guarantees Or Collateral To Entity Related Party Transactions Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfProvisionOfGuaranteesOrCollateralToEntityRelatedPartyTransactionsTableTextBlock
728 Schedule Of Provision Of Guarantees Or Collateral By Entity Related Party Transactions Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfProvisionOfGuaranteesOrCollateralByEntityRelatedPartyTransactionsTableTextBlock
729 23440100 - Disclosure - Business Combination(Table) Network

*

*

 http://www.kbfg.com/role/BusinessCombinationTables
730 Implied Table Table

*

*

 implied:Table
731 Disclosure Of Business Combinations Abstract [Abstract] Abstract ifrs-full:DisclosureOfBusinessCombinationsAbstract
732 Disclosure Of Detailed Information About Business Combinations Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutBusinessCombinationsExplanatory
733 Disclosure Of Acquired Receivables Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfAcquiredReceivablesExplanatory
734 Schedule Of Intangible Assets Acquired As Part Of Business Combination Table Text Block [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfIntangibleAssetsAcquiredAsPartOfBusinessCombinationTableTextBlock
735 Disclosure Of Sensitivity Analysis From The Value Of Acquired Business Recognized By Business Combination VOBA [Text Block] Concept (Text Block (HTML)) For Period kb:DisclosureOfSensitivityAnalysisFromTheValueOfAcquiredBusinessRecognizedByBusinessCombinationVOBATextBlock
736 Disclosure Of Exposure To Nonlife Insurance Price Risk As Of The Business Combination Date [Text Block] Concept (Text Block (HTML)) For Period kb:DisclosureOfExposureToNonlifeInsurancePriceRiskAsOfTheBusinessCombinationDateTextBlock
737 Schedule Of Loss Development Tables For General Insurance As Of The Business Combination Date [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfLossDevelopmentTablesForGeneralInsuranceAsOfTheBusinessCombinationDateTextBlock
738 Schedule Of Loss Development Tables For Automobile Insurance As Of The Business Combination Date [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfLossDevelopmentTablesForAutomobileInsuranceAsOfTheBusinessCombinationDateTextBlock
739 Schedule Of Loss Development Tables For Long Term Insurance As Of The Business Combination Date [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfLossDevelopmentTablesForLongTermInsuranceAsOfTheBusinessCombinationDateBlock
740 Schedule Of Maturity Structure Of Premium Reserve Related To Liquidity Risk As Of The Business Combination Date [Text Block] Concept (Text Block (HTML)) For Period kb:ScheduleOfMaturityStructureOfPremiumReserveRelatedToLiquidityRiskAsOfTheBusinessCombinationDateTextBlock
741 Disclosure Of Concentration And Credit Ratings For The Top Three Reinsurance Companies That Deal With The Group As Of The Business Combination Date [Text Block] Concept (Text Block (HTML)) For Period kb:DisclosureOfConcentrationAndCreditRatingsForTheTopThreeReinsuranceCompaniesThatDealWithTheGroupAsOfTheBusinessCombinationDateTextBlock
742 Disclosure Of Exposures To Credit Risk Related To Reinsurance As Of The Business Combination Date [Text Block] Concept (Text Block (HTML)) For Period kb:DisclosureOfExposuresToCreditRiskRelatedToReinsuranceAsOfTheBusinessCombinationDateTextBlock
743 Disclosure Of Exposure To Interest Rate Risk Of Insurance Contract As Of The Business Combination Date [Text Block] Concept (Text Block (HTML)) For Period kb:DisclosureOfExposureToInterestRateRiskOfInsuranceContractAsOfTheBusinessCombinationDateTextBlock
744 23460100 - Disclosure - Parent Company Information(Table) Network

*

*

 http://www.kbfg.com/role/ParentCompanyInformationTables
745 Implied Table Table

*

*

 implied:Table
746 Condensed Financial Information Of Parent Company Only Disclosure Abstract [Abstract] Abstract us-gaap:CondensedFinancialInformationOfParentCompanyOnlyDisclosureAbstract
747 Schedule Of Condensed Balance Sheet Table Text Block [Text Block] Concept (Text Block (HTML)) For Period us-gaap:ScheduleOfCondensedBalanceSheetTableTextBlock
748 Condensed Statement Of Comprehensive Income Table Text Block [Text Block] Concept (Text Block (HTML)) For Period us-gaap:CondensedStatementOfComprehensiveIncomeTableTextBlock
749 Schedule Of Condensed Cash Flow Statement Table Text Block [Text Block] Concept (Text Block (HTML)) For Period us-gaap:ScheduleOfCondensedCashFlowStatementTableTextBlock
750 24010101 - Disclosure - The Parent Company_Entity Information(Details) Network

*

*

 http://www.kbfg.com/role/TheParentCompanyEntityInformationDetails
751 Implied Table Table

*

*

 implied:Table
752 Entity Information Abstract [Abstract] Abstract kb:EntityInformationAbstract
753 Name Of Ultimate Parent Of Group Concept (Text/String) For Period ifrs-full:NameOfUltimateParentOfGroup
754 Name Of Reporting Entity Or Other Means Of Identification Concept (Text/String) For Period ifrs-full:NameOfReportingEntityOrOtherMeansOfIdentification
755 Description Of Nature Of Entitys Operations And Principal Activities Concept (Text/String) For Period ifrs-full:DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities
756 Issued Capital Concept (Monetary) As Of Credit ifrs-full:IssuedCapital
757 Number Of Shares Authorised Concept (Shares) As Of ifrs-full:NumberOfSharesAuthorised
758 24020101 - Disclosure - Basis Of Preparation_Basis Of Preparation Of Financial Statements(Details) Network

*

*

 http://www.kbfg.com/role/BasisOfPreparationBasisOfPreparationOfFinancialStatementsDetails
759 Disclosure Of Assets And Liabilities With Significant Risk Of Material Adjustment Table [Table] Table

*

*

 ifrs-full:DisclosureOfAssetsAndLiabilitiesWithSignificantRiskOfMaterialAdjustmentTable
760 Balance Sheet Location Axis [Axis] Axis us-gaap:BalanceSheetLocationAxis
761 Balance Sheet Location Domain [Domain] Member us-gaap:BalanceSheetLocationDomain
762 Deferred Tax Assets Member [Member] Member kb:DeferredTaxAssetsMember
763 Fair Value Of Financial Instruments Member [Member] Member kb:FairValueOfFinancialInstrumentsMember
764 Provisions For Credit Losses Member [Member] Member kb:ProvisionsForCreditLossesMember
765 Net Defined Benefit Liability Asset Member [Domain] Member ifrs-full:NetDefinedBenefitLiabilityAssetMember
766 Goodwill Member [Member] Member ifrs-full:GoodwillMember
767 Disclosure Of Assets And Liabilities With Significant Risk Of Material Adjustment Line Items [Line Items] LineItems ifrs-full:DisclosureOfAssetsAndLiabilitiesWithSignificantRiskOfMaterialAdjustmentLineItems
768 Description Of Nature Of Assets With Significant Risk Of Material Adjustments Within Next Financial Year Concept (Text/String) For Period ifrs-full:DescriptionOfNatureOfAssetsWithSignificantRiskOfMaterialAdjustmentsWithinNextFinancialYear
769 Description Of Nature Of Liabilities With Significant Risk Of Material Adjustments Within Next Financial Year Concept (Text/String) For Period ifrs-full:DescriptionOfNatureOfLiabilitiesWithSignificantRiskOfMaterialAdjustmentsWithinNextFinancialYear
770 24020102 - Disclosure - Basis Of Preparation_The Impact Of The Change In Classification And Measurement Of Financial Instrument Excluding Derivatives(Details) Network

*

*

 http://www.kbfg.com/role/BasisOfPreparationTheImpactOfTheChangeInClassificationAndMeasurementOfFinancialInstrumentExcludingDerivativesDetails
771 Disclosure Of Impact Of Change In Classification And Measurement Of Financial Assets Table[Table] Table

*

*

 kb:DisclosureOfImpactOfChangeInClassificationAndMeasurementOfFinancialAssetsTable
772 Classes Of Financial Assets Axis [Axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
773 Financial assets Member ifrs-full:FinancialAssetsMember
774 Cash and due from financial institutions Member kb:CashAndDueFromFinancialInstitutionMember
775 Financial Assets At Fair Value Through Profit Or Loss Category Member [Member] Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember
776 Financial assets held for trading Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTradingCategoryMember
777 Trading Securities-Debt Member kb:DebtSecuritiesClassifiedAsHeldForTradingMember
778 Trading Securities-Equity Member kb:EquitySecuritiesClassifiedAsHeldForTradingMember
779 Trading Securities-Others Member kb:OthersFinancialAssetsClassifiedAsHeldForTradingMember
780 Financial assets designated at fair value through profit and loss Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember
781 Loans Member ifrs-full:LoansAndReceivablesCategoryMember
782 Financial investments Member kb:FinancialInvestmentMember
783 Financial Assets Availableforsale Category Member [Member] Member ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
784 Available-for-sale Securities- Debt Member kb:DebtSecuritiesAvailableForSaleMember
785 Available-for-sale Securities- Equity Member kb:EquitySecuritiesAvailableForSaleMember
786 Held-to-maturity financial assets Member ifrs-full:HeldtomaturityInvestmentsCategoryMember
787 Other financial assets Member kb:OtherFinancialAssetsMember
788 Classes Of Financial Assets Of IFRS9 Axis[Axis] Axis kb:ClassesOfFinancialAssetsOfIFRS9Axis
789 Classification in accordance with IFRS 9 Member kb:FinancialAssetsClassesOfIFRS9Member
790 Measured at amortized cost Member kb:FinancialAssetsMeasuredAtAmortisedCostOfIFRS9Member
791 Recognized at fair value through profit or loss Member kb:FinancialAssetsReclassifiedAsMeasuredAtFairValueThroughProfitOrLossOfIFRS9Member
792 Recognized at fair value through other comprehensive income Member kb:FinancialAssetsReclassifiedAsMeasuredAtFairValueThroughOtherComprehensiveIncomeOfIFRS9Member
793 Disclosure Of Impact Of Change In Classification And Measurement Of Financial Assets LineItems[Line Items] LineItems kb:DisclosureOfImpactOfChangeInClassificationAndMeasurementOfFinancialAssetsLineItems
794 Amount in accordance with IAS 39 Concept (Monetary) As Of Debit kb:FinancialAssetsExcludingDerivatives
795 Amount in accordance with IFRS 9 Concept (Monetary) As Of Debit kb:FinancialAssetsExcludingDerivativesOfIFRS9
796 applied Overlay approach to the financial instruments Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsToWhichOverlayApproachIsApplied
797 Proportion Of Financial Assets At Fair Value Through Profit Or Loss Befor IFRS9 Concept (Percent) For Period kb:ProportionOfFinancialAssetsAtFairValueThroughProfitOrLossBeforIFRS9
798 Proportion Of Financial Assets At Fair Value Through Profit Or Loss After IFRS9 Concept (Percent) For Period kb:ProportionOfFinancialAssetsAtFairValueThroughProfitOrLossAfterIFRS9
799 24020103 - Disclosure - Basis Of Preparation_According To The Financial Assessment The Group Owns Loss Allowance(Details) Network

*

*

 http://www.kbfg.com/role/BasisOfPreparationAccordingToTheFinancialAssessmentTheGroupOwnsLossAllowanceDetails
800 Implied Table Table

*

*

 implied:Table
801 Disclosure Of Impact Of Change In Classification And Measurement Of Financial Liabilities Abstract[Abstract] Abstract kb:DisclosureOfImpactOfChangeInClassificationAndMeasurementOfFinancialLiabilitiesAbstract
802 changes in the credit risk of that liability Concept (Monetary) For Period Credit kb:ChangesInCreditRiskInRelationToFinancialLiabilitiesOnBasisOfMeasurementCategoryOfIFRS9
803 The amount of change in the fair value of the financial liabilities designated at fair value through profit or loss in applying IFRS 9 Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedAsUponInitialRecognition
804 24020104 - Disclosure - Basis Of Preparation_According To The Financial Assessment The Group Owns Loss Allowance2(Details) Network

*

*

 http://www.kbfg.com/role/BasisOfPreparationAccordingToTheFinancialAssessmentTheGroupOwnsLossAllowance2Details
805 Disclosure Of Impact Of Change In Impairment Table[Table] Table

*

*

 kb:DisclosureOfImpactOfChangeInImpairmentTable
806 Credit Risk Axis [Axis] Axis kb:CreditRiskAxis
807 Credit Risk Member [Domain] Member ifrs-full:CreditRiskMember
808 Financial Assets Member [Domain] Member ifrs-full:FinancialAssetsMember
809 Due from financial institutions Member kb:DueFromFinancialInstitutionsMember
810 Loans Member ifrs-full:LoansAndReceivablesCategoryMember
811 Other financial assets Member kb:OtherFinancialAssetsMember
812 Debt Securities Member kb:DebtSecuritiesAvailableForSaleMember
813 Financial assets held-to-maturity debt securities Member ifrs-full:HeldtomaturityInvestmentsCategoryMember
814 Off-balance sheet itmes Member kb:OffBalanceSheetItemMember
815 Unused Commitment and Gurantee Member kb:AcceptancesAndGuaranteesContractsMember
816 Financial guarantee contrancts Member ifrs-full:FinancialGuaranteeContractsMember
817 Classes Of Financial Assets Of IFRS9 Axis[Axis] Axis kb:ClassesOfFinancialAssetsOfIFRS9Axis
818 Financial Assets Classes Of IFRS9 Member[Domain] Member kb:FinancialAssetsClassesOfIFRS9Member
819 Measured at amortized cost Member kb:FinancialAssetsMeasuredAtAmortisedCostOfIFRS9Member
820 Recognized at fair value through profit or loss Member kb:FinancialAssetsReclassifiedAsMeasuredAtFairValueThroughProfitOrLossOfIFRS9Member
821 Recognized at fair value through other comprehensive income Member kb:FinancialAssetsReclassifiedAsMeasuredAtFairValueThroughOtherComprehensiveIncomeOfIFRS9Member
822 Disclosure Of Impact Of Change In Impairment LineItems[Line Items] LineItems kb:DisclosureOfImpactOfChangeInImpairmentLineItems
823 Loss allowance in accordance with IAS 39(a) Concept (Monetary) As Of Credit ifrs-full:AllowanceAccountForCreditLossesOfFinancialAssets
824 Loss allowance in accordance with IFRS 9(b) Concept (Monetary) As Of Credit kb:AllowanceAccountForCreditLossesOfFinancialAssetsOfIFRS9
825 Difference (b)-(a) Concept (Monetary) As Of Credit kb:ImpactOfAllowanceAccountForCreditLossesOfFinancialAssetsOfIFRS9
826 24030101 - Disclosure - Significant Accounting Policies_AccountingPolicies(Details) Network

*

*

 http://www.kbfg.com/role/SignificantAccountingPoliciesAccountingPoliciesDetails
827 Disclosure Of Intangible Assets Table [Table] Table

*

*

 ifrs-full:DisclosureOfIntangibleAssetsTable
828 Classes Of Intangible Assets Other Than Goodwill Axis [Axis] Axis ifrs-full:ClassesOfIntangibleAssetsOtherThanGoodwillAxis
829 Intangible Assets Other Than Goodwill Member [Domain] Member ifrs-full:IntangibleAssetsOtherThanGoodwillMember
830 Copyrights Patents And Other Industrial Property Rights Service And Operating Rights Member [Member] Member ifrs-full:CopyrightsPatentsAndOtherIndustrialPropertyRightsServiceAndOperatingRightsMember
831 Computer Software Member [Member] Member ifrs-full:ComputerSoftwareMember
832 Intangible Assets Held Under Capital Leases Member [Member] Member kb:IntangibleAssetsHeldUnderCapitalLeasesMember
833 Value Of Business Acquired Member[Member] Member ifrs-full:ValueOfBusinessAcquiredMember
834 Other Intangible Assets Member [Member] Member ifrs-full:OtherIntangibleAssetsMember
835 Disclosure Of Intangible Assets Line Items [Line Items] LineItems ifrs-full:DisclosureOfIntangibleAssetsLineItems
836 Amortisation Method Intangible Assets Other Than Goodwill Concept (Text/String) For Period ifrs-full:AmortisationMethodIntangibleAssetsOtherThanGoodwill
837 Useful Lives Or Amortisation Rates Intangible Assets Other Than Goodwill Concept (Text/String) For Period ifrs-full:UsefulLivesOrAmortisationRatesIntangibleAssetsOtherThanGoodwill
838 24030101 - Disclosure - Significant Accounting Policies_AccountingPolicies(Details) Network

*

*

 http://www.kbfg.com/role/SignificantAccountingPoliciesAccountingPoliciesDetails
839 Disclosure Of Investment Property Table [Table] Table

*

*

 ifrs-full:DisclosureOfInvestmentPropertyTable
840 Types Of Investment Property Axis [Axis] Axis ifrs-full:TypesOfInvestmentPropertyAxis
841 Investment Property Member [Domain] Member ifrs-full:InvestmentPropertyMember
842 Buildings Investment Property Member [Member] Member kb:BuildingsInvestmentPropertyMember
843 Disclosure Of Investment Property Line Items [Line Items] LineItems ifrs-full:DisclosureOfInvestmentPropertyLineItems
844 Depreciation Method Investment Property Cost Model Concept (Text/String) For Period ifrs-full:DepreciationMethodInvestmentPropertyCostModel
845 Useful Lives Or Depreciation Rates Investment Property Cost Model Concept (Text/String) For Period ifrs-full:UsefulLivesOrDepreciationRatesInvestmentPropertyCostModel
846 24030101 - Disclosure - Significant Accounting Policies_AccountingPolicies(Details) Network

*

*

 http://www.kbfg.com/role/SignificantAccountingPoliciesAccountingPoliciesDetails
847 Disclosure Of Property Plant And Equipment Table [Table] Table

*

*

 ifrs-full:DisclosureOfPropertyPlantAndEquipmentTable
848 Classes Of Property Plant And Equipment Axis [Axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
849 Property Plant And Equipment Member [Domain] Member ifrs-full:PropertyPlantAndEquipmentMember
850 Buildings Member [Member] Member ifrs-full:BuildingsMember
851 Leasehold Improvements Member [Member] Member ifrs-full:LeaseholdImprovementsMember
852 Machinery And Equipment Member [Member] Member us-gaap:MachineryAndEquipmentMember
853 Assets Held Under Capital Leases Member [Member] Member us-gaap:AssetsHeldUnderCapitalLeasesMember
854 Disclosure Of Property Plant And Equipment Line Items [Line Items] LineItems ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
855 Depreciation Method Property Plant And Equipment Concept (Text/String) For Period ifrs-full:DepreciationMethodPropertyPlantAndEquipment
856 Useful Lives Or Depreciation Rates Property Plant And Equipment Concept (Text/String) For Period ifrs-full:UsefulLivesOrDepreciationRatesPropertyPlantAndEquipment
857 24040201 - Disclosure - Financial Risk Management_Maximum Exposure To Credit Risk(Details) Network

*

*

 http://www.kbfg.com/role/FinancialRiskManagementMaximumExposureToCreditRiskDetails
858 Disclosure Of Credit Risk Exposure Table [Table] Table

*

*

 ifrs-full:DisclosureOfCreditRiskExposureTable
859 Credit Risk Axis [Axis] Axis kb:CreditRiskAxis
860 Credit Risk Member [Domain] Member ifrs-full:CreditRiskMember
861 Financial assets Member ifrs-full:FinancialAssetsMember
862 Due from financial institutions Member kb:DueFromFinancialInstitutionsMember
863 Financial assets at fair value through profit or loss Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember
864 Financial assets held for trading Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTradingCategoryMember
865 Financial assets designated at fair value through profit and loss Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember
866 Derivatives Member ifrs-full:DerivativesMember
867 Loans Member ifrs-full:LoansAndReceivablesCategoryMember
868 Financial investments Member kb:FinancialInvestmentsMember
869 Available-for-sale financial assets Member ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
870 Held-to-maturity financial assets Member ifrs-full:HeldtomaturityInvestmentsCategoryMember
871 Other financial assets Member kb:OtherFinancialAssetsMember
872 Off-balance sheet itmes Member kb:OffBalanceSheetItemMember
873 Unused Commitment and Gurantee Member kb:AcceptancesAndGuaranteesContractsMember
874 Financial guarantee contrancts Member ifrs-full:FinancialGuaranteeContractsMember
875 Commitments Member us-gaap:CommitmentsMember
876 Disclosure Of Financial Instruments Line Items [Line Items] LineItems ifrs-full:DisclosureOfFinancialInstrumentsLineItems
877 Maximum Exposure To Credit Risk Concept (Monetary) As Of ifrs-full:MaximumExposureToCreditRisk
878 Financial Instruments Indexed To The Price Of Gold Concept (Monetary) As Of Debit kb:FinancialInstrumentsIndexedToThePriceOfGold
879 24040202 - Disclosure - Financial Risk Management_Loans(Details) Network

*

*

 http://www.kbfg.com/role/FinancialRiskManagementLoansDetails
880 Disclosure Of Financial Assets That Are Either Past Due Or Impaired Table [Table] Table

*

*

 ifrs-full:DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedTable
881 Types Of Customers Axis [Axis] Axis ifrs-full:TypesOfCustomersAxis
882 Types Of Customers Member [Domain] Member ifrs-full:TypesOfCustomersMember
883 Retail Member ifrs-full:ConsumerLoansMember
884 Corporate Member ifrs-full:CorporateLoansMember
885 Credit card Member us-gaap:CreditCardReceivablesMember
886 Impairment Of Financial Assets Axis [Axis] Axis ifrs-full:ImpairmentOfFinancialAssetsAxis
887 Entitys Total For Impairment Of Financial Assets Member [Domain] Member ifrs-full:EntitysTotalForImpairmentOfFinancialAssetsMember
888 Neither past due nor impaired Member ifrs-full:FinancialAssetsNeitherPastDueNorImpairedMember
889 Past due but note impaired Member ifrs-full:FinancialAssetsPastDueButNotImpairedMember
890 Impared Member ifrs-full:FinancialAssetsImpairedMember
891 Carrying Amount Accumulated Depreciation Amortisation And Impairment And Gross Carrying Amount Axis [Axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
892 Carrying amount Member ifrs-full:CarryingAmountMember
893 Gross Carrying Amount Member ifrs-full:GrossCarryingAmountMember
894 Less: Allowances Member ifrs-full:AccumulatedImpairmentMember
895 Composition Of Loans Line Items [Line Items] LineItems kb:CompositionOfLoansLineItem
896 Amount Concept (Monetary) As Of Debit ifrs-full:LoansAndReceivables
897 % Concept (Percent) As Of kb:PortionOfLoansAndRecevables
898 24040203 - Disclosure - Financial Risk Management_Credit Quality Of Loans That Are Neither Past Due Nor Impared(Details) Network

*

*

 http://www.kbfg.com/role/FinancialRiskManagementCreditQualityOfLoansThatAreNeitherPastDueNorImparedDetails
899 Disclosure Of Financial Assets That Are Either Past Due Or Impaired Table [Table] Table

*

*

 ifrs-full:DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedTable
900 Types Of Customers Axis [Axis] Axis ifrs-full:TypesOfCustomersAxis
901 Total Member ifrs-full:TypesOfCustomersMember
902 Retail Member ifrs-full:ConsumerLoansMember
903 Corporate Member ifrs-full:CorporateLoansMember
904 Credit card Member us-gaap:CreditCardReceivablesMember
905 Internal Credit Grades Axis [Axis] Axis ifrs-full:InternalCreditGradesAxis
906 Entity's total for internal credit grades [Domain] Member ifrs-full:EntitysTotalForInternalCreditGradesMember
907 Grade 1 Member kb:Grade1OfInternalCreditGradesMember
908 Grade 2 Member kb:Grade2OfInternalCreditGradesMember
909 Grade 3 Member kb:Grade3OfInternalCreditGradesMember
910 Grade 4 Member kb:Grade4OfInternalCreditGradesMember
911 Grade 5 Member kb:Grade5OfInternalCreditGradesMember
912 Loans Neither Past Due Nor Impaired Line Items [Line Items] LineItems kb:LoansNeitherPastDueNorImpairedLineItem
913 Loans Neither Past Due Nor Impaired Concept (Monetary) As Of Debit kb:LoansNeitherPastDueNorImpaired
914 24040204 - Disclosure - Financial Risk Management_Credit Quality Of Loans Graded According To Internal Credit Ratings(Details) Network

*

*

 http://www.kbfg.com/role/FinancialRiskManagementCreditQualityOfLoansGradedAccordingToInternalCreditRatingsDetails
915 Disclosure Of Internal Credit Exposures Range Table [Table] Table

*

*

 kb:DisclosureOfInternalCreditExposuresRangeTable
916 Internal Credit Grades Axis [Axis] Axis ifrs-full:InternalCreditGradesAxis
917 Entity's total for internal credit grades [Domain] Member ifrs-full:EntitysTotalForInternalCreditGradesMember
918 Grade 1 Member kb:Grade1OfInternalCreditGradesMember
919 Grade 2 Member kb:Grade2OfInternalCreditGradesMember
920 Grade 3 Member kb:Grade3OfInternalCreditGradesMember
921 Grade 4 Member kb:Grade4OfInternalCreditGradesMember
922 Grade 5 Member kb:Grade5OfInternalCreditGradesMember
923 Range Axis [Axis] Axis ifrs-full:RangeAxis
924 Range of Probability of Default (%) Member ifrs-full:RangesMember
925 Bottom Of Range Member [Member] Member ifrs-full:BottomOfRangeMember
926 Top Of Range Member [Member] Member ifrs-full:TopOfRangeMember
927 Probability Of Default Line Items [Line Items] LineItems kb:ProbabilityOfDefaultLineItem
928 Range of Probability of Default (%) Concept (Percent) As Of kb:ProbabilityOfDefault
929 24040204 - Disclosure - Financial Risk Management_Credit Quality Of Loans Graded According To Internal Credit Ratings(Details) Network

*

*

 http://www.kbfg.com/role/FinancialRiskManagementCreditQualityOfLoansGradedAccordingToInternalCreditRatingsDetails
930 Disclosure Of Internal Credit Exposures Table [Table] Table

*

*

 ifrs-full:DisclosureOfInternalCreditExposuresTable
931 Types Of Customers Axis [Axis] Axis ifrs-full:TypesOfCustomersAxis
932 Types Of Customers Member [Domain] Member ifrs-full:TypesOfCustomersMember
933 Retail Member ifrs-full:ConsumerLoansMember
934 Corporate Member ifrs-full:CorporateLoansMember
935 Internal Credit Grades Axis [Axis] Axis ifrs-full:InternalCreditGradesAxis
936 Entity's total for internal credit grades [Domain] Member ifrs-full:EntitysTotalForInternalCreditGradesMember
937 Grade 1 Member kb:Grade1OfInternalCreditGradesMember
938 Grade 2 Member kb:Grade2OfInternalCreditGradesMember
939 Grade 3 Member kb:Grade3OfInternalCreditGradesMember
940 Grade 4 Member kb:Grade4OfInternalCreditGradesMember
941 Grade 5 Member kb:Grade5OfInternalCreditGradesMember
942 Credit Quality Of Loans Line Item [Line Items] LineItems kb:CreditQualityOfLoansLineItem
943 Credit Quality Of Loans Concept (Text/String) For Period kb:CreditQualityOfLoans
944 24040205 - Disclosure - Financial Risk Management_Loans That Are Past Due But Not Impaired(Details) Network

*

*

 http://www.kbfg.com/role/FinancialRiskManagementLoansThatArePastDueButNotImpairedDetails
945 Disclosure Of Financial Assets That Are Either Past Due Or Impaired Table [Table] Table

*

*

 ifrs-full:DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedTable
946 Past Due Status Axis [Axis] Axis ifrs-full:PastDueStatusAxis
947 Past Due Status Member [Domain] Member ifrs-full:PastDueStatusMember
948 1~29 days Member ifrs-full:CurrentMember
949 30~59 days Member ifrs-full:LaterThanOneMonthAndNotLaterThanTwoMonthsMember
950 60~89 days Member ifrs-full:LaterThanTwoMonthsAndNotLaterThanThreeMonthsMember
951 90 days or more Member ifrs-full:LaterThanThreeMonthsMember
952 Types Of Customers Axis [Axis] Axis ifrs-full:TypesOfCustomersAxis
953 Types Of Customers Member [Domain] Member ifrs-full:TypesOfCustomersMember
954 Retail Member ifrs-full:ConsumerLoansMember
955 Corporate Member ifrs-full:CorporateLoansMember
956 Credit card Member us-gaap:CreditCardReceivablesMember
957 Loans Past Due But Not Impaired Line Items [Line Items] LineItems kb:LoansPastDueButNotImpairedLineItem
958 Loans Past Due But Not Impaired Concept (Monetary) As Of Debit kb:LoansPastDueButNotImpaired
959 24040206 - Disclosure - Financial Risk Management_Impaired Loans(Details) Network

*

*

 http://www.kbfg.com/role/FinancialRiskManagementImpairedLoansDetails
960 Disclosure Of Financial Assets That Are Either Past Due Or Impaired Table [Table] Table

*

*

 ifrs-full:DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedTable
961 Types Of Customers Axis [Axis] Axis ifrs-full:TypesOfCustomersAxis
962 Types Of Customers Member [Domain] Member ifrs-full:TypesOfCustomersMember
963 Retail Member ifrs-full:ConsumerLoansMember
964 Corporate Member ifrs-full:CorporateLoansMember
965 Credit card Member us-gaap:CreditCardReceivablesMember
966 Impairment Of Financial Assets Axis [Axis] Axis ifrs-full:ImpairmentOfFinancialAssetsAxis
967 Entitys Total For Impairment Of Financial Assets Member [Domain] Member ifrs-full:EntitysTotalForImpairmentOfFinancialAssetsMember
968 Financial Assets Impaired Member [Member] Member ifrs-full:FinancialAssetsImpairedMember
969 Carrying Amount Accumulated Depreciation Amortisation And Impairment And Gross Carrying Amount Axis [Axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
970 Carrying amount Member ifrs-full:CarryingAmountMember
971 Loans Member ifrs-full:GrossCarryingAmountMember
972 Allowances Member ifrs-full:AccumulatedImpairmentMember
973 Individual assessment Member ifrs-full:ExpectedCreditLossesIndividuallyAssessedMember
974 Collective assessment Member ifrs-full:ExpectedCreditLossesCollectivelyAssessedMember
975 Loans Impaired Line Items[Line Items] LineItems kb:LoansImpairedLineItem
976 Loans Impaired Concept (Monetary) As Of Debit kb:LoansImpaired
977 24040207 - Disclosure - Financial Risk Management_The Quantification Of The Extent To Which Collateral And Other Credit Enhancements Mitigate Credit Risk(Details) Network

*

*

 http://www.kbfg.com/role/FinancialRiskManagementTheQuantificationOfTheExtentToWhichCollateralAndOtherCreditEnhancementsMitigateCreditRiskDetails
978 Collateral And Other Credit Enhancement Table [Table] Table

*

*

 kb:CollateralAndOtherCreditEnhancementTable
979 Loan To Value Axis [Axis] Axis us-gaap:LoanToValueAxis
980 Loan To Value Domain[Domain] Member us-gaap:LoanToValueDomain
981 Impaired Loans Member kb:ImpairedLoansMember
982 Individual Member kb:IndividualAssessmentMember
983 Collective Member kb:CollectiveAssessmentMember
984 Non-impaired Loans Member kb:NonImpairedLoansMember
985 Past due Member kb:NotPastDueMember
986 Not past due Member kb:PastDueMember
987 Assets Held As Collateral Permitted To Be Sold Or Repledged At Fair Value Line Items [Line Items] LineItems kb:AssetsHeldAsCollateralPermittedToBeSoldOrRepledgedAtFairValueLineItem
988 Guarantees Concept (Monetary) As Of Debit kb:GuaranteesOfAssetsHeldAsCollateralPermittedToBeSoldOrRepledgedAtFairValue
989 Deposits and savings Concept (Monetary) As Of Debit kb:DepositsAndSavingsOfAssetsHeldAsCollateralPermittedToBeSoldOrRepledgedAtFairValue
990 Property and equipment Concept (Monetary) As Of Debit kb:PropertyAndEquipmentOfAssetsHeldAsCollateralPermittedToBeSoldOrRepledgedAtFairValue
991 Real estsate Concept (Monetary) As Of Debit kb:RealEstateOfAssetsHeldAsCollateralPermittedToBeSoldOrRepledgedAtFairValue
992 Financial Assets That Are Individually Determined To Be Impaired Fair Value Of Collateral Held And Other Credit Enhancements Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsThatAreIndividuallyDeterminedToBeImpairedFairValueOfCollateralHeldAndOtherCreditEnhancements
993 24040208 - Disclosure - Financial Risk Management_Financial Assets At Fair Value Through Profit Or Loss And Financial Investments Excluding Equity Securities That Are Exposed To Credit Risk(Details) Network

*

*

 http://www.kbfg.com/role/FinancialRiskManagementFinancialAssetsAtFairValueThroughProfitOrLossAndFinancialInvestmentsExcludingEquitySecuritiesThatAreExposedToCreditRiskDetails
994 Disclosure Of Financial Assets That Are Either Past Due Or Impaired Table [Table] Table

*

*

 ifrs-full:DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedTable
995 Impairment Of Financial Assets Axis [Axis] Axis ifrs-full:ImpairmentOfFinancialAssetsAxis
996 Entitys Total For Impairment Of Financial Assets Member [Domain] Member ifrs-full:EntitysTotalForImpairmentOfFinancialAssetsMember
997 Securities that are neither past due nor impaired Member ifrs-full:FinancialAssetsNeitherPastDueNorImpairedMember
998 Impaired securities Member ifrs-full:FinancialAssetsImpairedMember
999 Securities Excluding Equity Securities Line Items [Line Items] LineItems kb:SecuritiesExcludingEquitySecuritiesLineItem
1000 Securities Excluding Equity Securities Concept (Monetary) As Of Debit kb:SecuritiesExcludingEquitySecurities
1001 24040209 - Disclosure - Financial Risk Management_The Credit Quality Of Securities Excluding Equity Securities That Are Neither Past Due Nor Impaired(Details) Network

*

*

 http://www.kbfg.com/role/FinancialRiskManagementTheCreditQualityOfSecuritiesExcludingEquitySecuritiesThatAreNeitherPastDueNorImpairedDetails
1002 Disclosure Of External Credit Exposures Table [Table] Table

*

*

 ifrs-full:DisclosureOfExternalCreditExposuresTable
1003 External Credit Grades Axis [Axis] Axis ifrs-full:ExternalCreditGradesAxis
1004 Entity's total for external credit grades [Domain] Member ifrs-full:EntitysTotalForExternalCreditGradesMember
1005 Grade 1 Member kb:Grade1OfExternalCreditGradesMember
1006 Grade 2 Member kb:Grade2OfExternalCreditGradesMember
1007 Grade 3 Member kb:Grade3OfExternalCreditGradesMember
1008 Grade 4 Member kb:Grade4OfExternalCreditGradesMember
1009 Grade 5 Member kb:Grade5OfExternalCreditGradesMember
1010 Securities That Are Neither Past Due Nor Impaired Line Items [Line Items] LineItems kb:SecuritiesThatAreNeitherPastDueNorImpairedLineItem
1011 Securities that are neither past due nor impaired Abstract kb:SecuritiesThatAreNeitherPastDueNorImpairedAbstract
1012 Financial assets held for tradeing Concept (Monetary) As Of Debit kb:FinancialAssetsHeldForTradingOfSecuritiesThatAreNeitherPastDueNorImpaired
1013 Financial assets designated at fair value through profit or loss Concept (Monetary) As Of Debit kb:FinancialAssetsDesignatedAtFairValueThroughProfitOrLossOfSecuritiesThatAreNeitherPastDueNorImpaired
1014 Available-for-sale financial assets Concept (Monetary) As Of Debit kb:AvailableForSaleFinancialAssetsOfSecuritiesThatAreNeitherPastDueNorImpaired
1015 Held-to-maturity financial assets Concept (Monetary) As Of Debit kb:HeldToMaturityFinancialAssetsOfSecuritiesThatAreNeitherPastDueNorImpaired
1016 Securities That Are Neither Past Due Nor Impaired Concept (Monetary) As Of Debit kb:SecuritiesThatAreNeitherPastDueNorImpaired
1017 24040210 - Disclosure - Financial Risk Management_The Credit Quality Of Securities Excluding Equity Securities According To The Credit Ratings By External Rating Agencies(Details) Network

*

*

 http://www.kbfg.com/role/FinancialRiskManagementTheCreditQualityOfSecuritiesExcludingEquitySecuritiesAccordingToTheCreditRatingsByExternalRatingAgenciesDetails
1018 Disclosure Of External Credit Exposures Table [Table] Table

*

*

 ifrs-full:DisclosureOfExternalCreditExposuresTable
1019 External Credit Rating Agency Axis [Axis] Axis kb:ExternalCreditRatingAgencyAxis
1020 External Credit Rating Agency Member [Domain] Member kb:ExternalCreditRatingAgencyMember
1021 Domestic Member kb:DomesticMember
1022 KIS Member kb:KISMember
1023 NICE P&I Member kb:NICEPIMember
1024 KAP Member kb:KAPMember
1025 FnPricing Inc. Member kb:FnPricingIncMember
1026 Foreign Member kb:ForeignMember
1027 S&P Member kb:CreditRatingStandardPoorsMember
1028 Fitch-IBCA Member kb:CreditRatingFitchMember
1029 Moody's Member kb:CreditRatingMoodysMember
1030 External Credit Grades Axis [Axis] Axis ifrs-full:ExternalCreditGradesAxis
1031 Credit quality Member ifrs-full:EntitysTotalForExternalCreditGradesMember
1032 Grade 1 Member kb:Grade1OfExternalCreditGradesMember
1033 Grade 2 Member kb:Grade2OfExternalCreditGradesMember
1034 Grade 3 Member kb:Grade3OfExternalCreditGradesMember
1035 Grade 4 Member kb:Grade4OfExternalCreditGradesMember
1036 Grade 5 Member kb:Grade5OfExternalCreditGradesMember
1037 Range Axis [Axis] Axis ifrs-full:RangeAxis
1038 Ranges Member [Domain] Member ifrs-full:RangesMember
1039 Bottom Of Range Member [Member] Member ifrs-full:BottomOfRangeMember
1040 Top Of Range Member [Member] Member ifrs-full:TopOfRangeMember
1041 Credit Ratings By External Agencies Line Items [Line Items] LineItems kb:CreditRatingsByExternalAgenciesLineItem
1042 Credit Ratings By External Agencies Concept (Text/String) For Period kb:CreditRatingsByExternalAgencies
1043 24040211 - Disclosure - Financial Risk Management_A Quantification Of The Extent To Which Collateral And Other Credit Enhancements Mitigate Credit Risk Of Derivative Financial Instruments(Details) Network

*

*

 http://www.kbfg.com/role/FinancialRiskManagementAQuantificationOfTheExtentToWhichCollateralAndOtherCreditEnhancementsMitigateCreditRiskOfDerivativeFinancialInstrumentsDetails
1044 Implied Table Table

*

*

 implied:Table
1045 Collateral Mitigate Credit Risk Of Derivative Abstract [Abstract] Abstract kb:CollateralMitigateCreditRiskOfDerivativeAbstract
1046 Collateral Mitigate Credit Risk Of Derivative Concept (Monetary) As Of Debit kb:CollateralMitigateCreditRiskOfDerivative
1047 Deposits and savings, securities and others Concept (Monetary) As Of Debit kb:DepositsAndSavingsSecuritiesAndOthers
1048 24040212 - Disclosure - Financial Risk Management_The Groups Regional Loans(Details) Network

*

*

 http://www.kbfg.com/role/FinancialRiskManagementTheGroupsRegionalLoansDetails
1049 Details Of Group Regional Loans Table [Table] Table

*

*

 kb:DetailsOfGroupRegionalLoansTable
1050 Types Of Customers Axis [Axis] Axis ifrs-full:TypesOfCustomersAxis
1051 Types Of Customers Member [Domain] Member ifrs-full:TypesOfCustomersMember
1052 Retail Member ifrs-full:ConsumerLoansMember
1053 Corporate Member ifrs-full:CorporateLoansMember
1054 Credit card Member us-gaap:CreditCardReceivablesMember
1055 Carrying Amount Accumulated Depreciation Amortisation And Impairment And Gross Carrying Amount Axis [Axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
1056 Carrying amount Member ifrs-full:CarryingAmountMember
1057 Gross Carrying Amount Member ifrs-full:GrossCarryingAmountMember
1058 Allowances Member ifrs-full:AccumulatedImpairmentMember
1059 Geographical Areas Axis [Axis] Axis ifrs-full:GeographicalAreasAxis
1060 Geographical Areas Member [Domain] Member ifrs-full:GeographicalAreasMember
1061 Korea Member country:KR
1062 Europe Member us-gaap:EuropeMember
1063 China Member country:CN
1064 Japan Member country:JP
1065 United States Member country:US
1066 Others Member kb:OtherCountriesMember
1067 Group Regional Loans Line Items [Line Items] LineItems kb:GroupRegionalLoansLineItem
1068 Loans And Receivables Concept (Monetary) As Of Debit ifrs-full:LoansAndReceivables
1069 % Concept (Percent) As Of kb:PortionOfLoansAndRecevables
1070 24040213 - Disclosure - Financial Risk Management_The Groups Industrial Corporate Loans(Details) Network

*

*

 http://www.kbfg.com/role/FinancialRiskManagementTheGroupsIndustrialCorporateLoansDetails
1071 Details Of Group Industrial Corporate Loans Table [Table] Table

*

*

 kb:DetailsOfGroupIndustrialCorporateLoansTable
1072 Products And Services Axis [Axis] Axis ifrs-full:ProductsAndServicesAxis
1073 Products And Services Member [Domain] Member ifrs-full:ProductsAndServicesMember
1074 Financial institutions Member kb:FinancialInstitutionsMember
1075 Manufacturing Member kb:ManufacturingMember
1076 Service Member kb:ServiceMember
1077 Wholesale & Retail Member kb:WholesaleNRetailMember
1078 Construction Member kb:ConstructionMember
1079 Public sector Member kb:PublicSectorMember
1080 Others Member kb:OtherIndustriesMember
1081 Carrying Amount Accumulated Depreciation Amortisation And Impairment And Gross Carrying Amount Axis [Axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
1082 Carrying amount Member ifrs-full:CarryingAmountMember
1083 Loans Member ifrs-full:GrossCarryingAmountMember
1084 Allowances Member ifrs-full:AccumulatedImpairmentMember
1085 Industrial Corporate Loans Line Items[Line Items] LineItems kb:IndustrialCorporateLoansLineItem
1086 Corporate Loans Concept (Monetary) As Of Debit ifrs-full:CorporateLoans
1087 % Concept (Percent) As Of kb:PortionofCorporateLoans
1088 24040214 - Disclosure - Financial Risk Management_Types Of The Groups Retail And Credit Card Loans(Details) Network

*

*

 http://www.kbfg.com/role/FinancialRiskManagementTypesOfTheGroupsRetailAndCreditCardLoansDetails
1089 Type Of Group Retail And Credit Card Loans Table [Table] Table

*

*

 kb:TypeOfGroupRetailAndCreditCardLoansTable
1090 Sales Channels Axis [Axis] Axis ifrs-full:SalesChannelsAxis
1091 Sales Channels Member [Domain] Member ifrs-full:SalesChannelsMember
1092 Housing Member kb:HousingMember
1093 General Member kb:GeneralMember
1094 Credit card Member us-gaap:CreditCardReceivablesMember
1095 Carrying Amount Accumulated Depreciation Amortisation And Impairment And Gross Carrying Amount Axis [Axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
1096 Carrying amount Member ifrs-full:CarryingAmountMember
1097 Loans Member ifrs-full:GrossCarryingAmountMember
1098 Allowances Member ifrs-full:AccumulatedImpairmentMember
1099 Retail And Credit Card Loans Line Items[Line Items] LineItems kb:RetailAndCreditCardLoansLineItem
1100 Retail And Credit Card Loans Concept (Monetary) As Of Debit kb:RetailAndCreditCardLoans
1101 Portionof Retail And Credit Card Loans Concept (Percent) As Of kb:PortionofRetailAndCreditCardLoans
1102 24040215 - Disclosure - Financial Risk Management_The Groups Industrial Securities Excluding Equity Securities And Derivative(Details) Network

*

*

 http://www.kbfg.com/role/FinancialRiskManagementTheGroupsIndustrialSecuritiesExcludingEquitySecuritiesAndDerivativeDetails
1103 Details Of Group Industrials Securities Excluding Equity Securities And Derivatives Table [Table] Table

*

*

 kb:DetailsOfGroupIndustrialsSecuritiesExcludingEquitySecuritiesAndDerivativesTable
1104 Classes Of Financial Assets Axis [Axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
1105 Financial Assets Member [Domain] Member ifrs-full:FinancialAssetsMember
1106 Financial assets held for trading Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTradingCategoryMember
1107 Financial assets designated at fair value through profit and loss Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember
1108 Derivatives Member ifrs-full:DerivativesMember
1109 Available-for-sale financial assets Member ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
1110 Held-to-maturity financial assets Member ifrs-full:HeldtomaturityInvestmentsCategoryMember
1111 Types Of Issuer Axis [Axis] Axis kb:TypesOfIssuerAxis
1112 Types Of Issuer Member [Domain] Member kb:TypesOfIssuerMember
1113 Government and government funded institutions Member kb:GovernmentAndGovernmentFundedInstitutionsMember
1114 Banking and insurance Member kb:BankingAndInsuranceMember
1115 Others Member kb:OtherIssuersMember
1116 Group Industrial Securities Excluding Equity Securities And Derivatives Line Items [Line Items] LineItems kb:GroupIndustrialSecuritiesExcludingEquitySecuritiesAndDerivativesLineItem
1117 Amount Concept (Monetary) As Of Debit kb:SecuritiesExcludingEquitySecuritiesAndDerivatives
1118 % Concept (Percent) As Of kb:PortionOfIndustrialSecuritiesExcludingEquitySecuritiesAndDerivatives
1119 24040216 - Disclosure - Financial Risk Management_The Groups Regional Securities Excluding Equity Securities And Derivative(Details) Network

*

*

 http://www.kbfg.com/role/FinancialRiskManagementTheGroupsRegionalSecuritiesExcludingEquitySecuritiesAndDerivativeDetails
1120 Details Of Group Regional Securities Excluding Equity Securities And Derivatives Table [Table] Table

*

*

 kb:DetailsOfGroupRegionalSecuritiesExcludingEquitySecuritiesAndDerivativesTable
1121 Classes Of Financial Assets Axis [Axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
1122 Financial Assets Member [Domain] Member ifrs-full:FinancialAssetsMember
1123 Financial assets held for trading Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTradingCategoryMember
1124 Financial assets designated at fair value through profit and loss Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember
1125 Derivatives Member ifrs-full:DerivativesMember
1126 Available-for-sale financial assets Member ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
1127 Held-to-maturity financial assets Member ifrs-full:HeldtomaturityInvestmentsCategoryMember
1128 Geographical Areas Axis [Axis] Axis ifrs-full:GeographicalAreasAxis
1129 Geographical Areas Member [Domain] Member ifrs-full:GeographicalAreasMember
1130 Korea Member country:KR
1131 United States Member country:US
1132 Others Member kb:OtherCountriesMember
1133 Groups Regional Securities Excluding Equity Securities And Derivatives Line Items[Line Items] LineItems kb:GroupsRegionalSecuritiesExcludingEquitySecuritiesAndDerivativesLineItem
1134 Amount Concept (Monetary) As Of Debit kb:SecuritiesExcludingEquitySecuritiesAndDerivatives
1135 % Concept (Percent) As Of kb:PortionOfRegionalSecuritiesExcludingEquitySecuritiesAndDerivatives
1136 24040301 - Disclosure - Financial Risk Management_The Remaining Contractual Maturity Of Financial Assets And Liabilities Excluding Derivatives Held For Cash Flow Hedging(Details) Network

*

*

 http://www.kbfg.com/role/FinancialRiskManagementTheRemainingContractualMaturityOfFinancialAssetsAndLiabilitiesExcludingDerivativesHeldForCashFlowHedgingDetails
1137 Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Table [Table] Table

*

*

 ifrs-full:DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskTable
1138 Maturity Axis [Axis] Axis ifrs-full:MaturityAxis
1139 Aggregated Time Bands Member [Domain] Member ifrs-full:AggregatedTimeBandsMember
1140 On demand Member ifrs-full:OnDemandMember
1141 Up to 1 month Member ifrs-full:NotLaterThanOneMonthMember
1142 1-3 montshs Member ifrs-full:LaterThanOneMonthAndNotLaterThanThreeMonthsMember
1143 3-12 months Member ifrs-full:LaterThanThreeMonthsAndNotLaterThanOneYearMember
1144 1~5 years Member ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember
1145 Over 5 years Member ifrs-full:LaterThanFiveYearsMember
1146 Balance Sheet Location Axis [Axis] Axis us-gaap:BalanceSheetLocationAxis
1147 Balance Sheet Location Domain [Domain] Member us-gaap:BalanceSheetLocationDomain
1148 Financial assets Member ifrs-full:FinancialAssetsMember
1149 Cash and due from financial institutions Member kb:CashAndDueFromFinancialInstitutionMember
1150 Financial assets held for trading Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTradingCategoryMember
1151 Financial assets designated at fair value through profit and loss Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember
1152 Derivatives held of trading Member kb:DerivativesAssetsHeldForTradingMember
1153 Derivatives held for fair value hedging Member kb:DerivativesAssetsHeldForFairValueHedgingMember
1154 Loans Member ifrs-full:LoansAndReceivablesCategoryMember
1155 Available-for-sale financial assets Member ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
1156 Held-to-maturity financial assets Member ifrs-full:HeldtomaturityInvestmentsCategoryMember
1157 Other financial assets Member kb:OtherFinancialAssetsMember
1158 Financial liabilities Member ifrs-full:FinancialLiabilitiesMember
1159 Held for trading Member ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossThatMeetDefinitionOfHeldForTradingCategoryMember
1160 Designated at fair value through profit or loss Member ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember
1161 Derivatives held for trading Member kb:DerivativesLiabilitiesHeldForTradingMember
1162 Derivatives held for fair value hedging Member kb:DerivativesLiabilitiesHeldForFairValueHedgingMember
1163 Deposits Member us-gaap:DepositsMember
1164 Debts Member kb:DebtsMember
1165 Debentures Member kb:DebenturesMember
1166 Other financial liabilities Member kb:OtherFinancialLiabilitiesMember
1167 Off-balance sheet itmes Member kb:OffBalanceSheetItemMember
1168 Acceptances And Guarantees Contracts Member [Member] Member kb:AcceptancesAndGuaranteesContractsMember
1169 Commitments Member us-gaap:CommitmentsMember
1170 Financial guarantee contrancts Member ifrs-full:FinancialGuaranteeContractsMember
1171 Disclosure Of Maturity Analysis For Financial Assets Held For Managing Liquidity Risk Line Items [Line Items] LineItems ifrs-full:DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskLineItems
1172 Financial Assets Held For Managing Liquidity Risk Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsHeldForManagingLiquidityRisk
1173 Financial Liability Held For Managing Liquidity Risk Concept (Monetary) As Of Credit kb:FinancialLiabilityHeldForManagingLiquidityRisk
1174 Off Balance Sheet Item Held For Managing Liquidity Risk Concept (Monetary) As Of Credit kb:OffBalanceSheetItemHeldForManagingLiquidityRisk
1175 Cash Flow Of Restricted Due From Financial Institutions Concept (Monetary) For Period Debit kb:CashFlowOfRestrictedDueFromFinancialInstitutions
1176 24040302 - Disclosure - Financial Risk Management_The Contractual Cash Flows Of Derivatives Held For Cash Flow Hedging(Details) Network

*

*

 http://www.kbfg.com/role/FinancialRiskManagementTheContractualCashFlowsOfDerivativesHeldForCashFlowHedgingDetails
1177 Disclosure Of Maturity Analysis For Derivative Financial Liabilities Table [Table] Table

*

*

 ifrs-full:DisclosureOfMaturityAnalysisForDerivativeFinancialLiabilitiesTable
1178 Maturity Axis [Axis] Axis ifrs-full:MaturityAxis
1179 Aggregated Time Bands Member [Domain] Member ifrs-full:AggregatedTimeBandsMember
1180 Up to 1 month Member ifrs-full:NotLaterThanOneMonthMember
1181 1-3 montshs Member ifrs-full:LaterThanOneMonthAndNotLaterThanThreeMonthsMember
1182 3-12 months Member ifrs-full:LaterThanThreeMonthsAndNotLaterThanOneYearMember
1183 1~5 years Member ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember
1184 Over 5 years Member ifrs-full:LaterThanFiveYearsMember
1185 Disclosure Of Maturity Analysis For Derivative Financial Liabilities Line Items [Line Items] LineItems ifrs-full:DisclosureOfMaturityAnalysisForDerivativeFinancialLiabilitiesLineItems
1186 Net cash flow of net settlement derivatives Concept (Monetary) For Period Debit kb:NetCashFlowOfNetSettlementDerivatives
1187 Cash flow to be received of total settlement derivatives Concept (Monetary) For Period Debit kb:CashFlowToBeReceivedOfTotalSettlementDerivatives
1188 Cash flow to be paid of total settlement derivatives Concept (Monetary) For Period Credit kb:CashFlowToBePaidOfTotalSettlementDerivatives
1189 24040401 - Disclosure - Financial Risk Management_Value At Risk(Details) Network

*

*

 http://www.kbfg.com/role/FinancialRiskManagementValueAtRiskDetails
1190 Disclosure Of Value At Risk Table [Table] Table

*

*

 kb:DisclosureOfValueAtRiskTable
1191 Legal Entity Axis [Axis] Axis dei:LegalEntityAxis
1192 Entity Domain [Domain] Member dei:EntityDomain
1193 Kookmin Bank Member kb:KookminBankMember
1194 KB Securities Co., Ltd. Member kb:KBSecuritiesCoLtdMember
1195 KB Insurance Co., Ltd. Member kb:KBInsuranceCoLtdMember
1196 KB Life Insurance Co., Ltd. Member kb:KBLifeInsuranceCoLtdMember
1197 KB Investment Co., Ltd. Member kb:KBInvestmentCoLtdMember
1198 KB Asset Management Co., Ltd. Member kb:KBAssetManagementCoLtdMember
1199 Types Of Risks Axis [Axis] Axis ifrs-full:TypesOfRisksAxis
1200 Types Of Risks Member [Domain] Member ifrs-full:TypesOfRisksMember
1201 Interest rate risk Member ifrs-full:InterestRateRiskMember
1202 Stock price risk Member ifrs-full:EquityPriceRiskMember
1203 Foreign exchange rate risk Member ifrs-full:CurrencyRiskMember
1204 Commodity risk Member ifrs-full:CommodityPriceRiskMember
1205 Deduction of diversification effect Member ifrs-full:RiskDiversificationEffectMember
1206 Range Axis [Axis] Axis ifrs-full:RangeAxis
1207 Ranges Member [Domain] Member ifrs-full:RangesMember
1208 Average Member ifrs-full:WeightedAverageMember
1209 Minimum Member ifrs-full:BottomOfRangeMember
1210 Maximum Member ifrs-full:TopOfRangeMember
1211 Ending Member kb:EndingMember
1212 Value At Risk Line Items [Line Items] LineItems kb:ValueAtRiskLineItems
1213 Value At Risk Concept (Monetary) As Of ifrs-full:ValueAtRisk
1214 24040402 - Disclosure - Financial Risk Management_Required Equity Capital Not Measured By Value At Risk(Details) Network

*

*

 http://www.kbfg.com/role/FinancialRiskManagementRequiredEquityCapitalNotMeasuredByValueAtRiskDetails
1215 Disclosure Of Required Equity Capital Not Measured By Value At Risk Table [Table] Table

*

*

 kb:DisclosureOfRequiredEquityCapitalNotMeasuredByValueAtRiskTable
1216 Legal Entity Axis [Axis] Axis dei:LegalEntityAxis
1217 Entity Domain [Domain] Member dei:EntityDomain
1218 Kookmin Bank Member kb:KookminBankMember
1219 Types Of Risks Axis [Axis] Axis ifrs-full:TypesOfRisksAxis
1220 Types Of Risks Member [Domain] Member ifrs-full:TypesOfRisksMember
1221 Interest rate risk Member ifrs-full:InterestRateRiskMember
1222 Stock price risk Member ifrs-full:EquityPriceRiskMember
1223 Foreign exchange rate risk Member ifrs-full:CurrencyRiskMember
1224 Required Equity Capital Not Measured By VaR Line Items [Line Items] LineItems kb:RequiredEquityCapitalNotMeasuredByVaRLineItems
1225 Required Equity Capital Not Measured By VaR Concept (Monetary) As Of Credit kb:RequiredEquityCapitalNotMeasuredByVaR
1226 24040403 - Disclosure - Financial Risk Management_Interest Rate Value At Risk(Details) Network

*

*

 http://www.kbfg.com/role/FinancialRiskManagementInterestRateValueAtRiskDetails
1227 Disclosure Of Interest Rate Value At Risk Table [Table] Table

*

*

 kb:DisclosureOfInterestRateValueAtRiskTable
1228 Legal Entity Axis [Axis] Axis dei:LegalEntityAxis
1229 Entity Domain [Domain] Member dei:EntityDomain
1230 Kookmin Bank Member kb:KookminBankMember
1231 KB Securities Co., Ltd. Member kb:KBSecuritiesCoLtdMember
1232 KB Insurance Co., Ltd. Member kb:KBInsuranceCoLtdMember
1233 KB Kookmin Card Co., Ltd. Member kb:KBKookminCardCoLtdMember
1234 KB Life Insurance Co., Ltd. Member kb:KBLifeInsuranceCoLtdMember
1235 KB Savings Bank Co., Ltd. Member kb:KBSavingBankCoLtdMember
1236 KB Capital Co.,Ltd. Member kb:KBCapitalCoLtdMember
1237 Interest Rate Value At Risk Line Items [Line Items] LineItems kb:InterestRateValueAtRiskLineItems
1238 Interest Rate Value At Risk Concept (Monetary) As Of Credit kb:InterestRateValueAtRisk
1239 24040404 - Disclosure - Financial Risk Management_Multiple Foreign Currency Exchange Rates(Details) Network

*

*

 http://www.kbfg.com/role/FinancialRiskManagementMultipleForeignCurrencyExchangeRatesDetails
1240 Schedule Of Differences Between Reported Amount And Reporting Currency Denominated Amount Table [Table] Table

*

*

 us-gaap:ScheduleOfDifferencesBetweenReportedAmountAndReportingCurrencyDenominatedAmountTable
1241 Currency Axis [Axis] Axis us-gaap:CurrencyAxis
1242 All Currencies Domain[Domain] Member currency:AllCurrenciesDomain
1243 USD Member currency:USD
1244 JPY Member currency:JPY
1245 EUR Member currency:EUR
1246 GBP Member currency:GBP
1247 CNY Member currency:CNY
1248 Others Member currency:XXX
1249 Balance Sheet Location Axis [Axis] Axis us-gaap:BalanceSheetLocationAxis
1250 Balance Sheet Location Domain [Domain] Member us-gaap:BalanceSheetLocationDomain
1251 Financial assets Member ifrs-full:FinancialAssetsMember
1252 Cash and due from financial institutions Member kb:CashAndDueFromFinancialInstitutionMember
1253 Financial assets held for trading Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTradingCategoryMember
1254 Financial assets designated at fair value through profit and loss Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember
1255 Derivatives held of trading Member kb:DerivativesAssetsHeldForTradingMember
1256 Derivatives held for fair value hedging Member kb:DerivativesAssetsHeldForFairValueHedgingMember
1257 Loans Member ifrs-full:LoansAndReceivablesCategoryMember
1258 Available-for-sale financial assets Member ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
1259 Held-to-maturity financial assets Member ifrs-full:HeldtomaturityInvestmentsCategoryMember
1260 Other financial assets Member kb:OtherFinancialAssetsMember
1261 Financial liabilities Member ifrs-full:FinancialLiabilitiesMember
1262 Held for trading Member ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossThatMeetDefinitionOfHeldForTradingCategoryMember
1263 Designated at fair value through profit or loss Member ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember
1264 Derivatives held for trading Member kb:DerivativesLiabilitiesHeldForTradingMember
1265 Derivatives held for fair hedging Member kb:DerivativesLiabilitiesHeldForFairValueHedgingMember
1266 Deposits Member us-gaap:DepositsMember
1267 Debts Member kb:DebtsMember
1268 Debentures Member kb:DebenturesMember
1269 Other financial liabilities Member kb:OtherFinancialLiabilitiesMember
1270 Off-balance sheet itmes Member kb:OffBalanceSheetItemMember
1271 Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts Line Items [Line Items] LineItems us-gaap:FinancialStatementLineItemsWithDifferencesInReportedAmountAndReportingCurrencyDenominatedAmountsLineItems
1272 Asset Reporting Currency Denominated Value Concept (Monetary) As Of Debit us-gaap:AssetReportingCurrencyDenominatedValue
1273 Liability Reporting Currency Denominated Value Concept (Monetary) As Of Credit us-gaap:LiabilityReportingCurrencyDenominatedValue
1274 Off Balance Sheet Item In Foreign Currencies Concept (Monetary) As Of Debit kb:OffBalanceSheetItemInForeignCurrencies
1275 24040601 - Disclosure - Financial Risk Management_Objectives Policies And Processes For Managing Capital(Details) Network

*

*

 http://www.kbfg.com/role/FinancialRiskManagementObjectivesPoliciesAndProcessesForManagingCapitalDetails
1276 Implied Table Table

*

*

 implied:Table
1277 Objectives Policies And Process For Manaing Capital Abstract [Abstract] Abstract kb:ObjectivesPoliciesAndProcessForManaingCapitalAbstract
1278 Disclosure Of Objectives Policies And Processes For Managing Capital Abstract [Abstract] Abstract ifrs-full:DisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalAbstract
1279 Minimum Common Equity Tier One Ratio Concept (Percent) As Of kb:MinimumCommonEquityTierOneRatio
1280 Minimum Tier One Ratio Concept (Percent) As Of kb:MinimumTierOneRatio
1281 Minimum Total Regulatory Capital Ratio Concept (Percent) As Of kb:MinimumTotalRegulatoryCapitalRatio
1282 Summary Of Quantitative Data About What Entity Manages As Capital Concept (Text/String) For Period ifrs-full:SummaryOfQuantitativeDataAboutWhatEntityManagesAsCapital
1283 Qualitative Information About Entitys Objectives Policies And Processes For Managing Capital Concept (Text/String) For Period ifrs-full:QualitativeInformationAboutEntitysObjectivesPoliciesAndProcessesForManagingCapital
1284 Capital Abstract [Abstract] Abstract us-gaap:CapitalAbstract
1285 Capital Concept (Monetary) As Of Credit us-gaap:Capital
1286 Equity Capital Abstract us-gaap:TierOneRiskBasedCapitalAbstract
1287 Tier 1 Capital Concept (Monetary) As Of Credit us-gaap:TierOneRiskBasedCapital
1288 Common Equity Tier 1 Capital Concept (Monetary) As Of Credit us-gaap:CommonEquityTierOneCapital
1289 Additional Tier 1 Capital Concept (Monetary) As Of Credit us-gaap:ExcessTierOneRiskBasedCapital
1290 Tier 2 Capital Concept (Monetary) As Of Credit us-gaap:TierTwoRiskBasedCapital
1291 Risk-weighted assets: Concept (Monetary) As Of Debit us-gaap:RiskWeightedAssets
1292 Equity Capital (%): Concept (Percent) As Of us-gaap:CapitalToRiskWeightedAssets
1293 Tier 1 Capital (%) Concept (Percent) As Of us-gaap:TierOneRiskBasedCapitalToRiskWeightedAssets
1294 Common Equity Tier 1 Capital (%) Concept (Percent) As Of us-gaap:CommonEquityTierOneCapitalRatio
1295 24040602 - Disclosure - Financial Risk Management_Nature And Extent Of Risks Arising From Financial Instruments(Details) Network

*

*

 http://www.kbfg.com/role/FinancialRiskManagementNatureAndExtentOfRisksArisingFromFinancialInstruments
1296 Disclosure Of Nature And Extent Of Risks Arising From Financial Instruments Table [Table] Table

*

*

 ifrs-full:DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable
1297 Types Of Risks Axis [Axis] Axis ifrs-full:TypesOfRisksAxis
1298 Types Of Risks Member [Domain] Member ifrs-full:TypesOfRisksMember
1299 Credit Risk Member [Domain] Member ifrs-full:CreditRiskMember
1300 Liquidity Risk Member [Member] Member ifrs-full:LiquidityRiskMember
1301 Market Risk Member [Member] Member ifrs-full:MarketRiskMember
1302 Currency Risk Member [Member] Member ifrs-full:CurrencyRiskMember
1303 Interest Rate Risk Member [Member] Member ifrs-full:InterestRateRiskMember
1304 Other Price Risk Member [Member] Member ifrs-full:OtherPriceRiskMember
1305 Risk Diversification Effect Member [Member] Member ifrs-full:RiskDiversificationEffectMember
1306 Disclosure Of Nature And Extent Of Risks Arising From Financial Instruments Line Items [Line Items] LineItems ifrs-full:DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems
1307 Description Of Exposure To Risk Concept (Text/String) For Period ifrs-full:DescriptionOfExposureToRisk
1308 Description Of Objectives Policies And Processes For Managing Risk Concept (Text/String) For Period ifrs-full:DescriptionOfObjectivesPoliciesAndProcessesForManagingRisk
1309 Methods Used To Measure Risk Concept (Text/String) For Period ifrs-full:MethodsUsedToMeasureRisk
1310 24050101 - Disclosure - Segment Information_Operating Segments(Details) Network

*

*

 http://www.kbfg.com/role/SegmentInformationOperatingSegmentsDetails
1311 Disclosure Of Operating Segments Table [Table] Table

*

*

 ifrs-full:DisclosureOfOperatingSegmentsTable
1312 Segments Axis [Axis] Axis ifrs-full:SegmentsAxis
1313 Segments Member [Domain] Member ifrs-full:SegmentsMember
1314 Reportable segments [Member] Member ifrs-full:ReportableSegmentsMember
1315 Banking service Member kb:BankingBusinessMember
1316 Corporate Banking Member kb:CorporateBankingMember
1317 Retail Banking Member kb:RetailBankingMember
1318 Other Banking Services Member kb:OtherBankingServicesMember
1319 Securities Member kb:SecuritiesBusinessMember
1320 Non-life Insurance Member kb:NonLifeInsuranceBusinessMember
1321 Credit Card Member kb:CreditCardBusinessMember
1322 Life Insurance Member kb:LifeInsuranceBusinessMember
1323 Others Member kb:OtherBusinessMember
1324 Intra-group Adjustments Member ifrs-full:EliminationOfIntersegmentAmountsMember
1325 Disclosure Of Operating Segments Line Items [Line Items] LineItems ifrs-full:DisclosureOfOperatingSegmentsLineItems
1326 Operating revenues from external customers Concept (Monetary) For Period Credit kb:OperatingRevenesFromExternalCustomers
1327 Intra-segment operating revenues(expenses) Concept (Monetary) For Period Credit kb:IntraSegmentOperatingRevenues
1328 Revenue Concept (Monetary) For Period Credit ifrs-full:Revenue
1329 Net interest income Concept (Monetary) For Period Credit ifrs-full:InterestRevenueExpense
1330 Interest income Concept (Monetary) For Period Credit ifrs-full:RevenueFromInterest
1331 Interest expense Concept (Monetary) For Period Debit ifrs-full:InterestExpense
1332 Net fee and commission income Concept (Monetary) For Period Credit ifrs-full:FeeAndCommissionIncomeExpense
1333 Fee and commission income Concept (Monetary) For Period Credit ifrs-full:FeeAndCommissionIncome
1334 Fee And Commission Expense Concept (Monetary) For Period Debit ifrs-full:FeeAndCommissionExpense
1335 Net insurance income(expense) Concept (Monetary) For Period Credit kb:IncomeExpenseArisingFromInsuranceContracts
1336 Insurance income Concept (Monetary) For Period Credit ifrs-full:IncomeArisingFromInsuranceContracts
1337 Insurance expense Concept (Monetary) For Period Debit ifrs-full:ExpenseArisingFromInsuranceContracts
1338 Net gains(losses) on financial assets/liabilities at fair value through profit or loss Concept (Monetary) For Period Credit kb:GainLossOnFinancialAssetsLiabilitiesAtFairValueThroughProfitOrLoss
1339 Net other operating income(expense) Concept (Monetary) For Period Credit ifrs-full:OtherOperatingIncomeExpense
1340 General and administrative expenses Concept (Monetary) For Period Debit ifrs-full:AdministrativeExpense
1341 Operating profit before provision for credit losses Concept (Monetary) For Period Credit kb:ProfitLossFromOperatingAcitivitiesBeforeProvisionForCreditLosses
1342 Provision For Credit Losses Concept (Monetary) For Period Debit kb:ProvisionForCreditLosses
1343 Net operating income (expense) Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromOperatingActivities
1344 Share of profit of associates and joint ventures Concept (Monetary) For Period Credit kb:GainLossOnAssociatesAccountsUsingEquityMethod
1345 Net other non-operating income(expense) Concept (Monetary) For Period Credit us-gaap:OtherNonoperatingIncomeExpense
1346 Segment profits before income tax Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
1347 Income tax expense Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
1348 Profit for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
1349 Profit attributable to shareholders of the Parent Company Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOwnersOfParent
1350 Profit attributable to non-controlling interests Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToNoncontrollingInterests
1351 Total assets Concept (Monetary) As Of Debit ifrs-full:Assets
1352 Total liabilities Concept (Monetary) As Of Credit ifrs-full:Liabilities
1353 Description Of Nature Of Differences Between Measurements Of Reportable Segments Assets And Entitys Assets Concept (Text/String) For Period ifrs-full:DescriptionOfNatureOfDifferencesBetweenMeasurementsOfReportableSegmentsAssetsAndEntitysAssets
1354 Description Of Nature Of Differences Between Measurements Of Reportable Segments Liabilities And Entitys Liabilities Concept (Text/String) For Period ifrs-full:DescriptionOfNatureOfDifferencesBetweenMeasurementsOfReportableSegmentsLiabilitiesAndEntitysLiabilities
1355 Description Of Types Of Products And Services From Which Each Reportable Segment Derives Its Revenues Concept (Text/String) For Period ifrs-full:DescriptionOfTypesOfProductsAndServicesFromWhichEachReportableSegmentDerivesItsRevenues
1356 24050201 - Disclosure - Segment Information_Operating Revenes From External Customers Foreachservice(Details) Network

*

*

 http://www.kbfg.com/role/SegmentInformationOperatingRevenesFromExternalCustomersForeachserviceDetails
1357 Disclosure Of Operating Revenes From External Customers For Each Service Table [Table] Table

*

*

 kb:DisclosureOfOperatingRevenesFromExternalCustomersForEachServiceTable
1358 Segments Axis [Axis] Axis ifrs-full:SegmentsAxis
1359 Segments Member [Domain] Member ifrs-full:SegmentsMember
1360 Total Member ifrs-full:ReportableSegmentsMember
1361 Banking service Member kb:BankingBusinessMember
1362 Securities Member kb:SecuritiesBusinessMember
1363 Non-life Insurance Member kb:NonLifeInsuranceBusinessMember
1364 Credit Card Member kb:CreditCardBusinessMember
1365 Life Insurance Member kb:LifeInsuranceBusinessMember
1366 Others Member kb:OtherBusinessMember
1367 Operating Revenes From External Customers For Each Service Line Items [Line Items] LineItems kb:OperatingRevenesFromExternalCustomersForEachServiceLineItems
1368 Operating Revenes From External Customers Concept (Monetary) For Period Credit kb:OperatingRevenesFromExternalCustomers
1369 24050202 - Disclosure - Segment Information_Geographical Operating Revenues From External Customers(Details) Network

*

*

 http://www.kbfg.com/role/SegmentInformationGeographicalOperatingRevenuesFromExternalCustomersDetails
1370 Disclosure Of Geographical Areas Table [Table] Table

*

*

 ifrs-full:DisclosureOfGeographicalAreasTable
1371 Geographical Areas Axis [Axis] Axis ifrs-full:GeographicalAreasAxis
1372 Total Member ifrs-full:GeographicalAreasMember
1373 Domestic Member country:KR
1374 United States Member country:US
1375 New Zealand Member country:NZ
1376 China Member country:CN
1377 JP Member [Member] Member country:JP
1378 AR Member [Member] Member country:AR
1379 VN Member [Member] Member country:VN
1380 Cambodia Member country:KH
1381 United Kingdom Member country:GB
1382 Others Member country:XX
1383 Adjustment Member ifrs-full:EliminationOfIntersegmentAmountsMember
1384 Disclosure Of Geographical Areas Line Items [Line Items] LineItems ifrs-full:DisclosureOfGeographicalAreasLineItems
1385 Revenues from external customers Concept (Monetary) For Period Credit kb:OperatingRevenesFromExternalCustomers
1386 Major non-current assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentAssetsOtherThanFinancialInstrumentsDeferredTaxAssetsPostemploymentBenefitAssetsAndRightsArisingUnderInsuranceContracts
1387 24060101 - Disclosure - Financial Assets and Financial Liabilities_Carrying Amount And Fair Value Of Financial Assets And Liabilities(Details) Network

*

*

 http://www.kbfg.com/role/FinancialAssetsAndFinancialLiabilitiesCarryingAmountAndFairValueOfFinancialAssetsAndLiabilitiesDetails
1388 Disclosure Of Fair Value Measurement Of Assets Table [Table] Table

*

*

 ifrs-full:DisclosureOfFairValueMeasurementOfAssetsTable
1389 Classes Of Financial Assets Axis [Axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
1390 Financial assets Member ifrs-full:FinancialAssetsMember
1391 Cash and due from financial institutions Member kb:CashAndDueFromFinancialInstitutionMember
1392 Financial Assets At Fair Value Through Profit Or Loss Category Member [Member] Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember
1393 Financial assets held for trading Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTradingCategoryMember
1394 Debt securities Member kb:DebtSecuritiesClassifiedAsHeldForTradingMember
1395 Equity securities Member kb:EquitySecuritiesClassifiedAsHeldForTradingMember
1396 Others Member kb:OthersFinancialAssetsClassifiedAsHeldForTradingMember
1397 Designated at fair value through profit or loss Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember
1398 Debt securities Member kb:DebtSecuritiesAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionMember
1399 Equity securities Member kb:EquitySecuritiesAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionMember
1400 Derivative linked securities Member kb:DerivativeLinkedSecuritiesMember
1401 Derivatives Member [Member] Member ifrs-full:DerivativesMember
1402 Derivatives held of trading Member kb:DerivativesAssetsHeldForTradingMember
1403 Derivatives held for hedging Member kb:DerivativesAssetsHeldForFairValueHedgingMember
1404 Loans And Receivables Category Member [Member] Member ifrs-full:LoansAndReceivablesCategoryMember
1405 Available-for-sale financial assets Member ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
1406 Available-for-sale Securities- Debt Member kb:DebtSecuritiesAvailableForSaleMember
1407 Equity securities Member kb:EquitySecuritiesAvailableForSaleMember
1408 Held-to-maturity financial assets Member ifrs-full:HeldtomaturityInvestmentsCategoryMember
1409 Other financial assets Member kb:OtherFinancialAssetsMember
1410 Levels Of Fair Value Hierarchy Axis [Axis] Axis ifrs-full:LevelsOfFairValueHierarchyAxis
1411 All Levels Of Fair Value Hierarchy Member [Domain] Member ifrs-full:AllLevelsOfFairValueHierarchyMember
1412 Level 1 Member ifrs-full:Level1OfFairValueHierarchyMember
1413 Level 2 Member ifrs-full:Level2OfFairValueHierarchyMember
1414 Level 3 Member ifrs-full:Level3OfFairValueHierarchyMember
1415 Disclosure Of Fair Value Measurement Of Assets Line Items [Line Items] LineItems ifrs-full:DisclosureOfFairValueMeasurementOfAssetsLineItems
1416 Carrying amount Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
1417 Fair value Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValue
1418 Financial Assets Measured At Fair Value Concept (Monetary) As Of Debit kb:FinancialAssetsMeasuredAtFairValue
1419 Financial Assets Not Measured At Fair Value But For Which Fair Value Is Disclosed Concept (Monetary) As Of Debit kb:FinancialAssetsNotMeasuredAtFairValueButForWhichFairValueIsDisclosed
1420 Reasonable Approximation Of Fair Value Financial Assets Concept (Monetary) As Of Debit kb:ReasonableApproximationOfFairValueFinancialAssets
1421 Financial Assets Whose Fair Values Are Disclosed And Classified As Level2 And Level3 Concept (Monetary) As Of Debit kb:FinancialAssetsWhoseFairValuesAreDisclosedAndClassifiedAsLevel2AndLevel3
1422 Description Of Financial Instruments Their Carrying Amount And Explanation Of Why Fair Value Cannot Be Measured Reliably Concept (Text/String) For Period ifrs-full:DescriptionOfFinancialInstrumentsTheirCarryingAmountAndExplanationOfWhyFairValueCannotBeMeasuredReliably
1423 Description Of Valuation Processes Used In Fair Value Measurement Assets Concept (Text/String) For Period ifrs-full:DescriptionOfValuationProcessesUsedInFairValueMeasurementAssets
1424 Valuation techniques Concept (Text/String) For Period ifrs-full:DescriptionOfValuationTechniquesUsedInFairValueMeasurementAssets
1425 Inputs Concept (Text/String) For Period ifrs-full:DescriptionOfInputsUsedInFairValueMeasurementAssets
1426 24060101 - Disclosure - Financial Assets and Financial Liabilities_Carrying Amount And Fair Value Of Financial Assets And Liabilities(Details) Network

*

*

 http://www.kbfg.com/role/FinancialAssetsAndFinancialLiabilitiesCarryingAmountAndFairValueOfFinancialAssetsAndLiabilitiesDetails
1427 Disclosure Of Fair Value Measurement Of Liabilities Table [Table] Table

*

*

 ifrs-full:DisclosureOfFairValueMeasurementOfLiabilitiesTable
1428 Classes Of Financial Liabilities Axis [Axis] Axis ifrs-full:ClassesOfFinancialLiabilitiesAxis
1429 Financial liabilities Member ifrs-full:FinancialLiabilitiesMember
1430 Held for trading Member ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossThatMeetDefinitionOfHeldForTradingCategoryMember
1431 Designated at fair value through profit or loss Member ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember
1432 Derivatives Member [Member] Member ifrs-full:DerivativesMember
1433 Derivatives held of trading Member kb:DerivativesAssetsHeldForTradingMember
1434 Derivatives held for hedging Member kb:DerivativesAssetsHeldForFairValueHedgingMember
1435 Deposits Member us-gaap:DepositsMember
1436 Debts Member kb:DebtsMember
1437 Debentures Member kb:DebenturesMember
1438 Financial liabilities Member kb:OtherFinancialLiabilitiesMember
1439 Levels Of Fair Value Hierarchy Axis [Axis] Axis ifrs-full:LevelsOfFairValueHierarchyAxis
1440 All Levels Of Fair Value Hierarchy Member [Domain] Member ifrs-full:AllLevelsOfFairValueHierarchyMember
1441 Level 1 Member ifrs-full:Level1OfFairValueHierarchyMember
1442 Level 2 Member ifrs-full:Level2OfFairValueHierarchyMember
1443 Level 3 Member ifrs-full:Level3OfFairValueHierarchyMember
1444 Disclosure Of Fair Value Measurement Of Liabilities Line Items [Line Items] LineItems ifrs-full:DisclosureOfFairValueMeasurementOfLiabilitiesLineItems
1445 Carrying amount Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilities
1446 Fair value Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesAtFairValue
1447 Financial Liabilities Measured At Fair Value Concept (Monetary) As Of Credit kb:FinancialLiabilitiesMeasuredAtFairValue
1448 Financial Liabilities Not Measured At Fair Value But For Which Fair Value Is Disclosed Concept (Monetary) As Of Credit kb:FinancialLiabilitiesNotMeasuredAtFairValueButForWhichFairValueIsDisclosed
1449 Reasonable Approximation Of Fair Value Financial Liabilities Concept (Monetary) As Of Credit kb:ReasonableApproximationOfFairValueFinancialLiabilities
1450 Fair value Concept (Monetary) As Of Credit kb:FinancialLiabilitiesWhoseFairValuesAreDisclosedAndClassifiedAsLevel2AndLevel3
1451 Description Of Valuation Processes Used In Fair Value Measurement Liabilities Concept (Text/String) For Period ifrs-full:DescriptionOfValuationProcessesUsedInFairValueMeasurementLiabilities
1452 Valuation techniques Concept (Text/String) For Period ifrs-full:DescriptionOfValuationTechniquesUsedInFairValueMeasurementLiabilities
1453 Inputs Concept (Text/String) For Period ifrs-full:DescriptionOfInputsUsedInFairValueMeasurementLiabilities
1454 24060102 - Disclosure - Financial Assets and Financial Liabilities_Details Of Changes In Level3 Of The Fair Value Hierarchy(Details) Network

*

*

 http://www.kbfg.com/role/FinancialAssetsAndFinancialLiabilitiesFinancialAssetsAndFinancialLiabilitiesDetailsOfChangesInLevel3OfTheFairValueHierarchyDetailsDetails
1455 Disclosure Of Changes In Level3 Of The Fair Value Hierarchy Table [Table] Table

*

*

 kb:DisclosureOfChangesInLevel3OfTheFairValueHierarchyTable
1456 Levels Of Fair Value Hierarchy Axis [Axis] Axis ifrs-full:LevelsOfFairValueHierarchyAxis
1457 All Levels Of Fair Value Hierarchy Member [Domain] Member ifrs-full:AllLevelsOfFairValueHierarchyMember
1458 Level3 Of Fair Value Hierarchy Member [Member] Member ifrs-full:Level3OfFairValueHierarchyMember
1459 Balance Sheet Location Axis [Axis] Axis us-gaap:BalanceSheetLocationAxis
1460 Balance Sheet Location Domain [Domain] Member us-gaap:BalanceSheetLocationDomain
1461 Financial assets at fair value through profit or loss Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember
1462 Designated at fair value through profit or loss Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember
1463 Financial investments Member kb:FinancialInvestmentMember
1464 Available-for-sale financial assets Member ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
1465 Financial liabilities at fair value through profit or loss Member ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember
1466 Designated at fair value through profit or loss Member ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember
1467 Derivatives Member ifrs-full:DerivativesMember
1468 Derivatives held for trading Member kb:DerivativesAssetsLiabilitiesHeldForTradingMember
1469 Derivatives held for hedging Member kb:DerivativesAssetsLiabilitiesHeldForFairValueHedgingMember
1470 Disclosure Of Changes In Level3 Of The Fair Value Hierarchy Line Items [Line Items] LineItems kb:DisclosureOfChangesInLevel3OfTheFairValueHierarchyLineItems
1471 Reconciliation Of Changes In Level3 Of The Fair Value Hierarchy Abstract [Abstract] Abstract kb:ReconciliationOfChangesInLevel3OfTheFairValueHierarchyAbstract
1472 Beginning balance Concept (Monetary) As Of Debit kb:FinancialAssetsLiabilitiesMeasuredAtFairValueLevel3OfTheFairValueHierarchy
1473 Changes In Financial Assets Liabilities Measured At Fair Value Level3 Of The Fair Value Hierarchy Abstract [Abstract] Abstract kb:ChangesInFinancialAssetsLiabilitiesMeasuredAtFairValueLevel3OfTheFairValueHierarchyAbstract
1474 Total Gains Losses From Financial Assets Liabilities Measured At Fair Value Level3 Of The Fair Value Hierarchy Abstract [Abstract] Abstract kb:TotalGainsLossesFromFinancialAssetsLiabilitiesMeasuredAtFairValueLevel3OfTheFairValueHierarchyAbstract
1475 Profit or loss Concept (Monetary) For Period Credit kb:GainsLossesRecognisedInProfitOrLossFairValueMeasurementFinancialAssetsLiabilities
1476 Other comprehensive income Concept (Monetary) For Period Credit kb:GainsLossesRecognisedInOtherComprehensiveIncomeFairValueMeasurementFinancialAssetsLiabilities
1477 Purchases Concept (Monetary) For Period Debit kb:PurchasesFairValueMeasurementFinancialAssetsLiabilities
1478 Sales Concept (Monetary) For Period Credit kb:SalesFairValueMeasurementFinancialAssetsLiabilities
1479 Issues Concept (Monetary) For Period Credit kb:IssuesFairValueMeasurementFinancialAssetsLiabilities
1480 Settlements Concept (Monetary) For Period Debit kb:SettlementsFairValueMeasurementFinancialAssetsLiabilities
1481 Transfers into Level 3 Concept (Monetary) For Period Debit kb:TransfersIntoLevel3OfFairValueHierarchyFinancialAssetsLiabilities
1482 Transfers out of Level 3 Concept (Monetary) For Period Credit kb:TransfersOutOfLevel3OfFairValueHierarchyFinancialAssetsLiabilities
1483 Business combination Concept (Monetary) For Period Debit kb:BusinessCombinationOfFairValueHierarchyFinancialAssetsLiabilities
1484 Changes from replacement of assets Of disposal group as held for sale Concept (Monetary) For Period Credit kb:ChangesFromReplacementOfAssetsOfDisposalGroupAsHeldForSale
1485 Ending balance Concept (Monetary) As Of Debit kb:FinancialAssetsLiabilitiesMeasuredAtFairValueLevel3OfTheFairValueHierarchy
1486 Description Of Reasons For Transfers Into Level3 Of Fair Value Hierarchy Assets Concept (Text/String) For Period ifrs-full:DescriptionOfReasonsForTransfersIntoLevel3OfFairValueHierarchyAssets
1487 Description Of Reasons For Transfers Out Of Level3 Of Fair Value Hierarchy Assets Concept (Text/String) For Period ifrs-full:DescriptionOfReasonsForTransfersOutOfLevel3OfFairValueHierarchyAssets
1488 24060201 - Disclosure - Financial Assets and Financial Liabilities_Total Gains Or Losses Recognized In Profit Or Loss For The Period(Details) Network

*

*

 http://www.kbfg.com/role/FinancialAssetsAndFinancialLiabilitiesTotalGainsOrLossesRecognizedInProfitOrLossForThePeriodDetails
1489 Disclosure Of Total Gain Or Losses From Changes In Level3 Fair Value Hierarchy Table [Table] Table

*

*

 kb:DisclosureOfTotalGainOrLossesFromChangesInLevel3FairValueHierarchyTable
1490 Income Statement Location Axis [Axis] Axis us-gaap:IncomeStatementLocationAxis
1491 Income Statement Location Domain [Domain] Member us-gaap:IncomeStatementLocationDomain
1492 Net income(loss) from financial investments at fair value through profit or loss Member kb:NetIncomeFromFinancialInvestmentsAtFairValueThroughProfitOrLossMember
1493 Other operating income(loss) Member us-gaap:OtherOperatingIncomeExpenseMember
1494 Net interest income Member us-gaap:InterestIncomeMember
1495 Total Gain Or Losses From Changes In Level3 Fair Value Hierarchy Line Items [Line Items] LineItems kb:TotalGainOrLossesFromChangesInLevel3FairValueHierarchyLineItems
1496 Total gains or losses included in profit or loss for the period Concept (Monetary) For Period Credit kb:GainsLossesRecognisedInProfitOrLossFairValueMeasurement
1497 Total gains or losses for the period included in profit or loss for financial instruments held at the end of the reporting period Concept (Monetary) For Period Credit kb:GainsLossesRecognisedInProfitOrLossAttributableToChangeInUnrealisedGainsOrLossesForFinancialInstrumentsHeldAtEndOfPeriodFairValueMeasurement
1498 24060202 - Disclosure - Financial Assets and Financial Liabilities_Information About Fair Value Measurements Using Unobservable Inputs Assets(Details) Network

*

*

 http://www.kbfg.com/role/FinancialAssetsAndFinancialLiabilitiesInformationAboutFairValueMeasurementsUsingUnobservableInputsAssetsDetails
1499 Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Table [Table] Table

*

*

 ifrs-full:DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsTable
1500 Classes Of Financial Assets Axis [Axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
1501 Financial assets Member ifrs-full:FinancialAssetsMember
1502 Financial Assets At Fair Value Through Profit Or Loss Designated Upon Initial Recognition Category Member [Member] Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember
1503 Debt securities Member kb:DebtSecuritiesAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionMember
1504 Equity securities Member kb:EquitySecuritiesAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionMember
1505 Derivative linked securities Member kb:DerivativeLinkedSecuritiesMember
1506 Derivatives Member [Member] Member ifrs-full:DerivativesMember
1507 Derivatives held of trading Member kb:DerivativesAssetsHeldForTradingMember
1508 Stock and index Member kb:StockAndIndexMember
1509 Currency, Interest rate and others Member kb:CurrencyInterestRateAndOthersMember
1510 Derivatives Assets Held For Fair Value Hedging Member [Member] Member kb:DerivativesAssetsHeldForFairValueHedgingMember
1511 Interest rate Member kb:InterestRateMember
1512 Financial Assets Availableforsale Category Member [Member] Member ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
1513 Debt securities Member ifrs-full:DebtSecuritiesMember
1514 Equity securities Member us-gaap:EquitySecuritiesMember
1515 Range Axis [Axis] Axis ifrs-full:RangeAxis
1516 Range of unobservable inputs(%) Member ifrs-full:RangesMember
1517 Bottom Of Range Member [Member] Member ifrs-full:BottomOfRangeMember
1518 Top Of Range Member [Member] Member ifrs-full:TopOfRangeMember
1519 Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items [Line Items] LineItems ifrs-full:DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsLineItems
1520 Fair value Concept (Monetary) As Of Debit kb:FinancialAssetsMeasuredByUnobservableInputs
1521 Valuation techniques Concept (Text/String) For Period ifrs-full:DescriptionOfValuationTechniquesUsedInFairValueMeasurementAssets
1522 Volatility Of The Underlying Asset Unobservable Inputs Assets Concept (Percent) As Of kb:VolatilityOfTheUnderlyingAssetUnobservableInputsAssets
1523 Correlation Between Underlying Asset Unobservable Inputs Assets Concept (Percent) As Of kb:CorrelationBetweenUnderlyingAssetUnobservableInputsAssets
1524 Loss Given Default Unobservable Inputs Assets Concept (Percent) For Period kb:LossGivenDefaultUnobservableInputsAssets
1525 Historical Volatility For Shares Significant Unobservable Inputs Assets Concept (Percent) For Period ifrs-full:HistoricalVolatilityForSharesSignificantUnobservableInputsAssets
1526 Volatility Of The Interest Rate Unobservable Inputs Assets Concept (Percent) As Of kb:VolatilityOfTheInterestRateUnobservableInputsAssets
1527 Discount Rate Unobservable Inputs Assets Concept (Percent) As Of kb:DiscountRateUnobservableInputsAssets
1528 Growth Rate Unobservable Inputs Assets Concept (Percent) As Of kb:GrowthRateUnobservableInputsAssets
1529 Liquidation Value Unobservable Inputs Assets Concept (Percent) As Of kb:LiquidationValueUnobservableInputsAssets
1530 Recovery Rate Of Receivables Acquisition Cost Unobservable Inputs Assets Concept (Percent) As Of kb:RecoveryRateOfReceivablesAcquisitionCostUnobservableInputsAssets
1531 Recovery Rate Unobservable Inputs Assets Concept (Percent) For Period kb:RecoveryRateUnobservableInputsAssets
1532 Volatility Unobservable Inputs Assets Concept (Percent) For Period kb:VolatilityUnobservableInputsAssets
1533 Asset Value Unobservable Inputs Assets Concept (Percent) For Period kb:AssetValueUnobservableInputsAssets
1534 Relationship Of Volatility Of The Underlying Asset Concept (Text/String) For Period kb:RelationshipOfVolatilityOfTheUnderlyingAsset
1535 Relationship Of Correlation Between Underlying Asset Concept (Text/String) For Period kb:RelationshipOfCorrelationBetweenUnderlyingAsset
1536 Relationship Of Loss Given Default Concept (Text/String) For Period kb:RelationshipOfLossGivenDefault
1537 Relationship Of Volatility Of TheInterest Rate Concept (Text/String) For Period kb:RelationshipOfVolatilityOfTheInterestRate
1538 Relationship Of Volatility Of the Stock Price Concept (Text/String) For Period kb:RelationshipOfVolatilityOftheStockPrice
1539 Relationship Of Discount Rate Concept (Text/String) For Period kb:RelationshipOfDiscountRate
1540 Relationship Of Growth Rate Concept (Text/String) For Period kb:RelationshipOfGrowthRate
1541 Relationship Of Liquidation Value Concept (Text/String) For Period kb:RelationshipOfLiquidationValue
1542 Relationship Of Recovery Rate Of Receivables Acquisition Cost Concept (Text/String) For Period kb:RelationshipOfRecoveryRateOfReceivablesAcquisitionCost
1543 Relationship Of Recovery Rate Concept (Text/String) For Period kb:RelationshipOfRecoveryRate
1544 Relationship Of Volatility Concept (Text/String) For Period kb:RelationshipOfVolatility
1545 Relationship Of Asset Value Concept (Text/String) For Period kb:RelationshipOfAssetValue
1546 24060203 - Disclosure - Financial Assets and Financial Liabilities_Information About Fair Value Measurements Using Unobservable Inputs Liablities(Details) Network

*

*

 http://www.kbfg.com/role/FinancialAssetsAndFinancialLiabilitiesInformationAboutFairValueMeasurementsUsingUnobservableInputsLiablitiesDetails
1547 Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Liabilities Table [Table] Table

*

*

 ifrs-full:DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfLiabilitiesTable
1548 Classes Of Financial Liabilities Axis [Axis] Axis ifrs-full:ClassesOfFinancialLiabilitiesAxis
1549 Financial liabilities Member ifrs-full:FinancialLiabilitiesMember
1550 Financial liabilities designated at fair value through profit or loss Member ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember
1551 Derivative linked securities Member kb:DerivativeLinkedSecuritiesMember
1552 Derivatives held for trading Member kb:DerivativesLiabilitiesHeldForTradingMember
1553 Stock and index Member kb:StockAndIndexMember
1554 Others Member kb:OthersDerivativesHeldForTradingMember
1555 Derivatives held for fair value hedging Member kb:DerivativesLiabilitiesHeldForFairValueHedgingMember
1556 Interest rate Member kb:InterestRateMember
1557 Range Axis [Axis] Axis ifrs-full:RangeAxis
1558 Range of unobservable inputs(%) Member ifrs-full:RangesMember
1559 Bottom Of Range Member [Member] Member ifrs-full:BottomOfRangeMember
1560 Top Of Range Member [Member] Member ifrs-full:TopOfRangeMember
1561 Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Liabilities Line Items [Line Items] LineItems ifrs-full:DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfLiabilitiesLineItems
1562 Fair value Concept (Monetary) As Of Credit kb:FinancialLiabilitiesMeasuredByUnobservableInputs
1563 Valuation techniques Concept (Text/String) For Period ifrs-full:DescriptionOfValuationTechniquesUsedInFairValueMeasurementLiabilities
1564 Volatility Of The Underlying Asset Unobservable Inputs Liabilities Concept (Percent) As Of kb:VolatilityOfTheUnderlyingAssetUnobservableInputsLiabilities
1565 Correlation Between Underlying Asset Unobservable Inputs Liabilities Concept (Percent) For Period kb:CorrelationBetweenUnderlyingAssetUnobservableInputsLiabilities
1566 Loss Given Default Unobservable Inputs Liabilities Concept (Percent) For Period kb:LossGivenDefaultUnobservableInputsLiabilities
1567 Historical Volatility For Shares Significant Unobservable Inputs Liabilities Concept (Percent) For Period ifrs-full:HistoricalVolatilityForSharesSignificantUnobservableInputsLiabilities
1568 Volatility Of The Interest Rate Unobservable Inputs Liabilities Concept (Percent) As Of kb:VolatilityOfTheInterestRateUnobservableInputsLiabilities
1569 Discount Rate Unobservable Inputs Liabilities Concept (Percent) As Of kb:DiscountRateUnobservableInputsLiabilities
1570 Relationship Of Volatility Of The Underlying Asset Concept (Text/String) For Period kb:RelationshipOfVolatilityOfTheUnderlyingAsset
1571 Relationship Of Correlation Between Underlying Asset Concept (Text/String) For Period kb:RelationshipOfCorrelationBetweenUnderlyingAsset
1572 Relationship Of Loss Given Default Concept (Text/String) For Period kb:RelationshipOfLossGivenDefault
1573 Relationship Of Volatility Of TheInterest Rate Concept (Text/String) For Period kb:RelationshipOfVolatilityOfTheInterestRate
1574 Relationship Of Volatility Of the Stock Price Concept (Text/String) For Period kb:RelationshipOfVolatilityOftheStockPrice
1575 Relationship Of Discount Rate Concept (Text/String) For Period kb:RelationshipOfDiscountRate
1576 24060204 - Disclosure - Financial Assets and Financial Liabilities_Sensitivity Analysis Of Changes In Unobservable Inputs Assets(Details) Network

*

*

 http://www.kbfg.com/role/FinancialAssetsAndFinancialLiabilitiesSensitivityAnalysisOfChangesInUnobservableInputsAssetsDetails
1577 Disclosure Of Sensitivity Analysis Of Changes In Unobservable Inputs Of Financial Assets Table [Table] Table

*

*

 kb:DisclosureOfSensitivityAnalysisOfChangesInUnobservableInputsOfFinancialAssetsTable
1578 Classes Of Financial Assets Axis [Axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
1579 Financial assets Member ifrs-full:FinancialAssetsMember
1580 Financial assets designated at fair value through profit and loss Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember
1581 Debt securities Member kb:DebtSecuritiesAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionMember
1582 Equity securities Member kb:EquitySecuritiesAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionMember
1583 Derivative linked securities Member kb:DerivativeLinkedSecuritiesMember
1584 Derivatives Member [Member] Member ifrs-full:DerivativesMember
1585 Derivatives held of trading Member kb:DerivativesAssetsHeldForTradingMember
1586 Derivatives held for fair value hedging Member kb:DerivativesAssetsHeldForFairValueHedgingMember
1587 Available-for-sale financial assets Member ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
1588 Debt securities Member ifrs-full:DebtSecuritiesMember
1589 Equity securities Member us-gaap:EquitySecuritiesMember
1590 Disclosure Of Sensitivity Analysis Of Changes In Unobservable Inputs Of Financial Assets Line Items [Line Items] LineItems kb:DisclosureOfSensitivityAnalysisOfChangesInUnobservableInputsOfFinancialAssetsLineItems
1591 Recognition in profit or loss Abstract kb:ChangesInUnobservableInputsFinancialAssetsRecognitionInProfitOrLossAbstract
1592 Favorable changes Concept (Monetary) For Period Credit kb:FavorableChangesInUnobservableInputsFinancialAssetsRecognitionInProfitOrLoss
1593 Unfavorable changes Concept (Monetary) For Period Debit kb:UnfavorableChangesInUnobservableInputsFinancialAssetsRecognitionInProfitOrLoss
1594 Other comprehensive income Abstract kb:ChangesInUnobservableInputsFinancialAssetsRecognitionInOtherComprehensiveIncomeAbstract
1595 Favorable changes Concept (Monetary) For Period Credit kb:FavorableChangesInUnobservableInputsFinancialAssetsRecognitionInOtherComprehensiveIncome
1596 Unfavorable changes Concept (Monetary) For Period Debit kb:UnfavorableChangesInUnobservableInputsFinancialAssetsRecognitionInOtherComprehensiveIncome
1597 Description Of Interrelationships Between Unobservable Inputs And Of How They Might Magnify Or Mitigate Effect Of Changes In Unobservable Inputs On Fair Value Measurement Assets Concept (Text/String) For Period ifrs-full:DescriptionOfInterrelationshipsBetweenUnobservableInputsAndOfHowTheyMightMagnifyOrMitigateEffectOfChangesInUnobservableInputsOnFairValueMeasurementAssets
1598 24060205 - Disclosure - Financial Assets and Financial Liabilities_Sensitivity Analysis Of Changes In Unobservable Inputs Liablities(Details) Network

*

*

 http://www.kbfg.com/role/FinancialAssetsAndFinancialLiabilitiesSensitivityAnalysisOfChangesInUnobservableInputsLiablitiesDetails
1599 Disclosure Of Sensitivity Analysis Of Changes In Unobservable Inputs Of Liabilities Table [Table] Table

*

*

 kb:DisclosureOfSensitivityAnalysisOfChangesInUnobservableInputsOfLiabilitiesTable
1600 Classes Of Financial Liabilities Axis [Axis] Axis ifrs-full:ClassesOfFinancialLiabilitiesAxis
1601 Financial Liabilities Member [Domain] Member ifrs-full:FinancialLiabilitiesMember
1602 Financial liabilities designated at fair value through profit or loss Member ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember
1603 Derivatives Member [Member] Member ifrs-full:DerivativesMember
1604 Derivatives held for trading Member kb:DerivativesLiabilitiesHeldForTradingMember
1605 Derivatives held for fair value hedging Member kb:DerivativesLiabilitiesHeldForFairValueHedgingMember
1606 Disclosure Of Sensitivity Analysis Of Changes In Unobservable Inputs Of Financial Liabilities Line Items [Line Items] LineItems kb:DisclosureOfSensitivityAnalysisOfChangesInUnobservableInputsOfFinancialLiabilitiesLineItems
1607 Recognition in profit or loss Abstract kb:ChangesInUnobservableInputsFinancialAssetsRecognitionInProfitOrLossAbstract
1608 Faverable changes Concept (Monetary) For Period Credit kb:FavorableChangesInUnobservableInputsFinancialLiabilitiesRecognitionInProfitOrLoss
1609 Unfaverable changes Concept (Monetary) For Period Debit kb:UnfavorableChangesInUnobservableInputsFinancialLiabilitiesRecognitionInProfitOrLoss
1610 Other comprehensive income Abstract kb:ChangesInUnobservableInputsFinancialAssetsRecognitionInOtherComprehensiveIncomeAbstract
1611 Faverable changes Concept (Monetary) For Period Credit kb:FavorableChangesInUnobservableInputsFinancialLiabilitiesRecognitionInOtherComprehensiveIncome
1612 Unfaverable changes Concept (Monetary) For Period Debit kb:UnfavorableChangesInUnobservableInputsFinancialLiabilitiesRecognitionInOtherComprehensiveIncome
1613 Description Of Interrelationships Between Unobservable Inputs And Of How They Might Magnify Or Mitigate Effect Of Changes In Unobservable Inputs On Fair Value Measurement Liabilities Concept (Text/String) For Period ifrs-full:DescriptionOfInterrelationshipsBetweenUnobservableInputsAndOfHowTheyMightMagnifyOrMitigateEffectOfChangesInUnobservableInputsOnFairValueMeasurementLiabilities
1614 24060206 - Disclosure - Financial Assets and Financial Liabilities_Day One Gain Or Loss (Details) Network

*

*

 http://www.kbfg.com/role/FinancialAssetsAndFinancialLiabilitiesDayOneGainOrLossDetails
1615 Implied Table Table

*

*

 implied:Table
1616 Reconciliation Of Aggregate Difference Between Fair Value At Initial Recognition And Amount Determined Using Valuation Technique Yet To Be Recognised Abstract [Abstract] Abstract ifrs-full:ReconciliationOfAggregateDifferenceBetweenFairValueAtInitialRecognitionAndAmountDeterminedUsingValuationTechniqueYetToBeRecognisedAbstract
1617 Description Of Accounting Policy For Recognising Difference Between Fair Value At Initial Recognition And Amount Determined Using Valuation Technique Explanatory Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForRecognisingDifferenceBetweenFairValueAtInitialRecognitionAndAmountDeterminedUsingValuationTechniqueExplanatory
1618 Balance at the beginning of the period Concept (Monetary) As Of ifrs-full:AggregateDifferenceBetweenFairValueAtInitialRecognitionAndAmountDeterminedUsingValuationTechniqueYetToBeRecognised
1619 New transactions and others Concept (Monetary) For Period ifrs-full:IncreaseDecreaseThroughNewTransactionsAggregateDifferenceBetweenFairValueAtInitialRecognitionAndAmountDeterminedUsingValuationTechniqueYetToBeRecognised
1620 Changes during the period Concept (Monetary) For Period ifrs-full:IncreaseDecreaseInAggregateDifferenceBetweenFairValueAtInitialRecognitionAndAmountDeterminedUsingValuationTechniqueYetToBeRecognised
1621 Balance at the end of the year Concept (Monetary) As Of ifrs-full:AggregateDifferenceBetweenFairValueAtInitialRecognitionAndAmountDeterminedUsingValuationTechniqueYetToBeRecognised
1622 24060301 - Disclosure - Financial Assets and Financial Liabilities_Carrying Amounts Of Financial Instruments By Category Assets(Details) Network

*

*

 http://www.kbfg.com/role/FinancialAssetsAndFinancialLiabilitiesCarryingAmountsOfFinancialInstrumentsByCategoryAssetsDetails
1623 Financial Assets By Category Table [Table] Table

*

*

 kb:FinancialAssetsByCategoryTable
1624 Categories Of Financial Assets Axis [Axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
1625 Financial Assets Category Member [Domain] Member ifrs-full:FinancialAssetsCategoryMember
1626 Financial assets at fair value through profit or loss Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember
1627 Held for trading Member kb:HeldForTradingCategoryMember
1628 Designated at fair value through profit or loss Member kb:DesignatedAtFairValueThroughProfitOrLossCategoryMember
1629 Loans and receivables Member ifrs-full:LoansAndReceivablesCategoryMember
1630 Available-for-sale financial assets Member ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
1631 Held-to-maturity financial assets Member ifrs-full:HeldtomaturityInvestmentsCategoryMember
1632 Derivatives held for hedging Member kb:DerivativesHeldForHedgingCategoryMember
1633 Classes Of Financial Assets Axis [Axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
1634 Financial assets Member ifrs-full:FinancialAssetsMember
1635 Cash and due from financial institutions Member kb:CashAndDueFromFinancialInstitutionMember
1636 Financial assets at fair value through profit or loss Member kb:FinancialAssetsAtFairValueThroughProfitOrLossMember
1637 Derivatives Member ifrs-full:DerivativesMember
1638 Loans Member kb:LoansAndReceivablesMember
1639 Financial investments Member kb:FinancialInvestmentMember
1640 Other financial assets Member kb:OtherFinancialAssetsMember
1641 Carrying Amounts Of Financial Assets Line Items [Line Items] LineItems kb:CarryingAmountsOfFinancialAssetsLineItems
1642 Financial Assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
1643 24060302 - Disclosure - Financial Assets and Financial Liabilities_Carrying Amounts Of Financial Instruments By Category Liabilities(Details) Network

*

*

 http://www.kbfg.com/role/FinancialAssetsAndFinancialLiabilitiesCarryingAmountsOfFinancialInstrumentsByCategoryLiabilitiesDetails
1644 Financial Liabilities By Category Table [Table] Table

*

*

 kb:FinancialLiabilitiesByCategoryTable
1645 Categories Of Financial Liabilities Axis [Axis] Axis ifrs-full:CategoriesOfFinancialLiabilitiesAxis
1646 Financial Liabilities Category Member [Domain] Member ifrs-full:FinancialLiabilitiesCategoryMember
1647 Financial liabilities at fair value through profit or loss Member ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember
1648 Held for trading Member ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossThatMeetDefinitionOfHeldForTradingCategoryMember
1649 Designated at fair value through profit or loss Member ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember
1650 Financial liabilities at amortized cost Member ifrs-full:FinancialLiabilitiesAtAmortisedCostCategoryMember
1651 Derivatives held for hedging Member kb:DerivativesHeldForHedgingCategoryMember
1652 Classes Of Financial Liabilities Axis [Axis] Axis ifrs-full:ClassesOfFinancialLiabilitiesAxis
1653 Financial Liabilities Member [Domain] Member ifrs-full:FinancialLiabilitiesMember
1654 Financial liabilities at fair value through profit or loss Member ifrs-full:FinancialLiabilitiesAtFairValueMember
1655 Derivatives Member ifrs-full:DerivativesMember
1656 Deposits Member us-gaap:DepositsMember
1657 Debts Member kb:DebtsMember
1658 Debentures Member kb:DebenturesMember
1659 Other financial liabilities Member kb:OtherFinancialLiabilitiesMember
1660 Carrying Amounts Of Financial Liabilities Line Items [Line Items] LineItems kb:CarryingAmountsOfFinancialLiabilitiesLineItems
1661 Financial Liabilities Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilities
1662 24060401 - Disclosure - Financial Assets and Financial Liabilities_The Maximum Exposure To Loss From Its Continuing Involvement In The Derecognized Financial Assets(Details) Network

*

*

 http://www.kbfg.com/role/FinancialAssetsAndFinancialLiabilitiesTheMaximumExposureToLossFromItsContinuingInvolvementInTheDerecognizedFinancialAssetsDetails
1663 Disclosure Of Continuing Involvement In Derecognised Financial Assets Table [Table] Table

*

*

 ifrs-full:DisclosureOfContinuingInvolvementInDerecognisedFinancialAssetsTable
1664 Continuing Involvement In Derecognised Financial Assets By Type Of Instrument Axis [Axis] Axis ifrs-full:ContinuingInvolvementInDerecognisedFinancialAssetsByTypeOfInstrumentAxis
1665 Classification of financial instruments Member ifrs-full:TypesOfInstrumentMember
1666 Available-for-sale financial assets Member ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
1667 Subordinate debt Member kb:SubordinateDebtMember
1668 Loans and receivables Member ifrs-full:LoansAndReceivablesCategoryMember
1669 Senior debt Member kb:SeniorDebtMember
1670 Continuing Involvement In Derecognised Financial Assets By Type Of Transfer Axis [Axis] Axis ifrs-full:ContinuingInvolvementInDerecognisedFinancialAssetsByTypeOfTransferAxis
1671 Types Of Transfer Member [Domain] Member ifrs-full:TypesOfTransferMember
1672 Securitisations Member [Member] Member ifrs-full:SecuritisationsMember
1673 EAKABSCoLtd Member [Member] Member kb:EAKABSCoLtdMember
1674 APABSFirstCoLtd Member [Member] Member kb:APABSFirstCoLtdMember
1675 Discovery ABS Second Co., Ltd. Member kb:DiscoveryABSFirstCoLtdMember
1676 EAK ABS Second Co., Ltd. Member kb:EAKABSSecondCoLtdMember
1677 FK1411 Co., Ltd. Member kb:FK1411CoLtdMember
1678 AP 3B ABS Ltd. Member kb:AP3BABSLtdMember
1679 AP 4D ABS Ltd. Member kb:AP4DABSLtdMember
1680 Disclosure Of Continuing Involvement In Derecognised Financial Assets Line Items [Line Items] LineItems ifrs-full:DisclosureOfContinuingInvolvementInDerecognisedFinancialAssetsLineItems
1681 Information About How Maximum Exposure To Loss Is Determined Concept (Text/String) For Period ifrs-full:InformationAboutHowMaximumExposureToLossIsDetermined
1682 Carrying amount of continuing involvement in statement of financial position Concept (Monetary) As Of ifrs-full:MaximumExposureToLossFromContinuingInvolvement
1683 Fair value of continuing involvement Concept (Monetary) As Of Debit ifrs-full:FairValueOfAssetsRepresentingContinuingInvolvementInDerecognisedFinancialAssets
1684 Gain Loss Of Derecognised Financial Assets At Date Of Transfer Concept (Monetary) For Period Credit ifrs-full:GainLossOfDerecognisedFinancialAssetsAtDateOfTransfer
1685 Recovered Portion In Excess Of The Consideration Paid Attributable To Adjustments Based On Agreement For Non Performing Loans Concept (Monetary) For Period Debit kb:RecoveredPortionInExcessOfTheConsiderationPaidAttributableToAdjustmentsBasedOnAgreementForNonPerformingLoans
1686 24060402 - Disclosure - Financial Assets and Financial Liabilities_Transferred Financial Assets That Are Not Derecognized In Their Entirety (Details) Network

*

*

 http://www.kbfg.com/role/FinancialAssetsAndFinancialLiabilitiesTransferredFinancialAssetsThatAreNotDerecognizedInTheirEntiretyDetails
1687 Disclosure Of Financial Assets Transferred During Period Which Do Not Qualify For Derecognition Table [Table] Table

*

*

 ifrs-full:DisclosureOfFinancialAssetsTransferredDuringPeriodWhichDoNotQualifyForDerecognitionTable
1688 Financial Assets Which Do Not Qualify For Derecognition Axis [Axis] Axis ifrs-full:FinancialAssetsWhichDoNotQualifyForDerecognitionAxis
1689 Financial Assets Which Do Not Qualify For Derecognition Member [Domain] Member ifrs-full:FinancialAssetsWhichDoNotQualifyForDerecognitionMember
1690 Loans Securitised For Senior Debentures Member [Member] Member kb:LoansSecuritisedForSeniorDebenturesMember
1691 KB Kookmin Card Second Securitization Co., Ltd. Member kb:KBKookminCardSecondSecuritizationCoLtdMember
1692 KB Kookmin Card Third Securitization Co., Ltd. Member kb:KBKookminCardThirdSecuritizationCoLtdMember
1693 KB Kookmin Card Fourth Securitization Co., Ltd. Member kb:KBKookminCardFourthSecuritizationCoLtdMember
1694 Wise Mobile Eighth Securitization Specialty Member kb:WiseMobileEighthSecuritizationSpecialtyMember
1695 Wise Mobile Ninth Securitization Specialty Member kb:WiseMobileNinthSecuritizationSpecialtyMember
1696 Wise Mobile Tenth Securitization Specialty Member kb:WiseMobileTenthSecuritizationSpecialtyMember
1697 Wise Mobile Eleventh Securitization Specialty Member kb:WiseMobileEleventhSecuritizationSpecialtyMember
1698 Wise Mobile Twelfth Securitization Specialty Member kb:WiseMobileTwelfthSecuritizationSpecialtyMember
1699 Wise Mobile Thirteenth Securitization Specialty Member kb:WiseMobileThirteenthSecuritizationSpecialtyMember
1700 Wise Mobile Fourteenth Securitization Specialty Member kb:WiseMobileFourteenthSecuritizationSpecialtyMember
1701 Wise Mobile Fifteenth Securitization Specialty Member kb:WiseMobileFifteenthSecuritizationSpecialtyMember
1702 Wise Mobile Sixteenth Securitization Specialty Member kb:WiseMobileSixteenthSecuritizationSpecialtyMember
1703 Wise Mobile Seventeenth Securitization Specialty Member kb:WiseMobileSeventeenthSecuritizationSpecialtyMember
1704 Wise Mobile Eighteenth Securitization Specialty Member kb:WiseMobileEighteenthSecuritizationSpecialtyMember
1705 Securiteis Under Repurchase Agreement And Loaned Securities Member [Member] Member kb:SecuriteisUnderRepurchaseAgreementAndLoanedSecuritiesMember
1706 Repurchase agreements Member kb:RepurchaseAgreementMember
1707 Loaned securities Member kb:SecuritiesLendingTransactionMember
1708 Government bond Member kb:GovernmentBondMember
1709 Stock Member kb:StockMember
1710 Others Member kb:OthersMember
1711 Disclosure Of Financial Assets Transferred During Period Which Do Not Qualify For Derecognition Line Items [Line Items] LineItems ifrs-full:DisclosureOfFinancialAssetsTransferredDuringPeriodWhichDoNotQualifyForDerecognitionLineItems
1712 Description Of Nature Of Relationship Between Transferred Financial Assets That Are Not Derecognised In Their Entirety And Associated Liabilities Concept (Text/String) For Period ifrs-full:DescriptionOfNatureOfRelationshipBetweenTransferredFinancialAssetsThatAreNotDerecognisedInTheirEntiretyAndAssociatedLiabilities
1713 Carrying amount of underlying assets Concept (Monetary) As Of Debit ifrs-full:OriginalAssetsBeforeTransfer
1714 Carring Amount of transferred assets Concept (Monetary) As Of Debit ifrs-full:AssetsThatEntityContinuesToRecognise
1715 Carrying amount of related liabilities Concept (Monetary) As Of Credit ifrs-full:AssociatedLiabilitiesThatEntityContinuesToRecognise
1716 24060501 - Disclosure - Financial Assets and Financial Liabilities_Details Of Financial Assets Subject To Offsetting(Details) Network

*

*

 http://www.kbfg.com/role/FinancialAssetsAndFinancialLiabilitiesDetailsOfFinancialAssetsSubjectToOffsettingDetails
1717 Disclosure Of Offsetting Of Financial Assets Table [Table] Table

*

*

 ifrs-full:DisclosureOfOffsettingOfFinancialAssetsTable
1718 Types Of Financial Assets Axis [Axis] Axis ifrs-full:TypesOfFinancialAssetsAxis
1719 Financial Assets Type Member [Domain] Member ifrs-full:FinancialAssetsTypeMember
1720 Derivatives held for trading and Derivatives linked securities Member kb:DerivativesAssetsHeldForTradingMember
1721 Derivatives held for hedging Member kb:DerivativesHeldForHedgingMember
1722 Receivable spot exchange Member kb:ReceivableSpotExchangeMember
1723 Reverse repurchase agreements Member kb:ReverseRepurchaseAgreementsMember
1724 Domestic exchange settlement debits Member kb:DomesticExchangeSettlementDebitsMember
1725 Other financial instruments Member kb:OtherFinancialInstrumentsMember
1726 Disclosure Of Offsetting Of Financial Assets Line Items [Line Items] LineItems ifrs-full:DisclosureOfOffsettingOfFinancialAssetsLineItems
1727 Net Financial Assets Subject To Offsetting Enforceable Master Netting Arrangements Or Similar Agreements Abstract [Abstract] Abstract ifrs-full:NetFinancialAssetsSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreementsAbstract
1728 Net Financial Assets Subject To Offsetting Enforceable Master Netting Arrangements Or Similar Agreements In Statement Of Financial Position Abstract [Abstract] Abstract ifrs-full:NetFinancialAssetsSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreementsInStatementOfFinancialPositionAbstract
1729 Gross assets Concept (Monetary) As Of Debit ifrs-full:GrossFinancialAssetsSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreements
1730 Gross liabilities offset Concept (Monetary) As Of Credit ifrs-full:GrossFinancialLiabilitiesSetOffAgainstFinancialAssetsSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreements
1731 Net Financial Assets Subject To Offsetting Enforceable Master Netting Arrangements Or Similar Agreements In Statement Of Financial Position Concept (Monetary) As Of Debit ifrs-full:NetFinancialAssetsSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreementsInStatementOfFinancialPosition
1732 Non-offsetting amount Abstract ifrs-full:AmountsSubjectToEnforceableMasterNettingArrangementOrSimilarAgreementNotSetOffAgainstFinancialAssetsAbstract
1733 Financial Instruments Concept (Monetary) As Of Credit ifrs-full:FinancialInstrumentsSubjectToEnforceableMasterNettingArrangementOrSimilarAgreementNotSetOffAgainstFinancialAssets
1734 Cash Collateral Concept (Monetary) As Of Credit ifrs-full:CashCollateralReceivedSubjectToEnforceableMasterNettingArrangementOrSimilarAgreementNotSetOffAgainstFinancialAssets
1735 Amounts Subject To Enforceable Master Netting Arrangement Or Similar Agreement Not Set Off Against Financial Assets Concept (Monetary) As Of Credit ifrs-full:AmountsSubjectToEnforceableMasterNettingArrangementOrSimilarAgreementNotSetOffAgainstFinancialAssets
1736 Net amount Concept (Monetary) As Of Debit ifrs-full:NetFinancialAssetsSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreements
1737 24060502 - Disclosure - Financial Assets and Financial Liabilities_Details Of Financial Liabilities Subject To Offsetting(Details) Network

*

*

 http://www.kbfg.com/role/FinancialAssetsAndFinancialLiabilitiesDetailsOfFinancialLiabilitiesSubjectToOffsettingDetails
1738 Disclosure Of Offsetting Of Financial Liabilities Table [Table] Table

*

*

 ifrs-full:DisclosureOfOffsettingOfFinancialLiabilitiesTable
1739 Types Of Financial Liabilities Axis [Axis] Axis ifrs-full:TypesOfFinancialLiabilitiesAxis
1740 Financial Liabilities Type Member [Domain] Member ifrs-full:FinancialLiabilitiesTypeMember
1741 Derivatives held for trading Member kb:DerivativesLiabilitiesHeldForTradingMember
1742 Derivatives held for hedging Member kb:DerivativesHeldForHedgingMember
1743 Payable spot exchange Member kb:PayableSpotExchangeMember
1744 Repurchase agreements Member us-gaap:RepurchaseAgreementsMember
1745 Securities borrowing agreements Member kb:SecuritiesBorrowingAgreementsMember
1746 Domestic exchange settlement debits Member kb:DomesticExchangeSettlementCreditsMember
1747 Other financial instruments Member kb:OtherFinancialInstrumentsMember
1748 Disclosure Of Offsetting Of Financial Liabilities Line Items [Line Items] LineItems ifrs-full:DisclosureOfOffsettingOfFinancialLiabilitiesLineItems
1749 Net Financial Liabilities Subject To Offsetting Enforceable Master Netting Arrangements Or Similar Agreements Abstract [Abstract] Abstract ifrs-full:NetFinancialLiabilitiesSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreementsAbstract
1750 Net Financial Liabilities Subject To Offsetting Enforceable Master Netting Arrangements Or Similar Agreements In Statement Of Financial Position Abstract [Abstract] Abstract ifrs-full:NetFinancialLiabilitiesSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreementsInStatementOfFinancialPositionAbstract
1751 Gross liabilities Concept (Monetary) As Of Credit ifrs-full:GrossFinancialLiabilitiesSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreements
1752 Gross assets offset Concept (Monetary) As Of Debit ifrs-full:GrossFinancialAssetsSetOffAgainstFinancialLiabilitiesSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreements
1753 Net amounts presented in the statement of financial position Concept (Monetary) As Of Credit ifrs-full:NetFinancialLiabilitiesSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreementsInStatementOfFinancialPosition
1754 Non-offsetting amount Abstract ifrs-full:AmountsSubjectToEnforceableMasterNettingArrangementOrSimilarAgreementNotSetOffAgainstFinancialLiabilitiesAbstract
1755 Financial Instruments Concept (Monetary) As Of Debit ifrs-full:FinancialInstrumentsSubjectToEnforceableMasterNettingArrangementOrSimilarAgreementNotSetOffAgainstFinancialLiabilities
1756 Cash Collateral Concept (Monetary) As Of Debit ifrs-full:CashCollateralPledgedSubjectToEnforceableMasterNettingArrangementOrSimilarAgreementNotSetOffAgainstFinancialLiabilities
1757 Amounts Subject To Enforceable Master Netting Arrangement Or Similar Agreement Not Set Off Against Financial Liabilities Concept (Monetary) As Of Debit ifrs-full:AmountsSubjectToEnforceableMasterNettingArrangementOrSimilarAgreementNotSetOffAgainstFinancialLiabilities
1758 Net Financial Liabilities Subject To Offsetting Enforceable Master Netting Arrangements Or Similar Agreements Concept (Monetary) As Of Credit ifrs-full:NetFinancialLiabilitiesSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreements
1759 24060503 - Disclosure - Financial Assets and Financial Liabilities_Fair Value Hierarchy Group Classifies And Discloses FairValue Of Financial Instruments(Details) Network

*

*

 http://www.kbfg.com/role/FairValueHierarchyGroupClassifiesAndDisclosesFairValueOfFinancialInstrumentsDetails
1760 Disclosure Of Fair Value Hierarchy Group Classifies And Discloses Fair Value Of Financial Instruments Table [Table] Table

*

*

 kb:DisclosureOfFairValueHierarchyGroupClassifiesAndDisclosesFairValueOfFinancialInstrumentsTable
1761 Levels Of Fair Value Hierarchy Axis [Axis] Axis ifrs-full:LevelsOfFairValueHierarchyAxis
1762 All Levels Of Fair Value Hierarchy Member [Domain] Member ifrs-full:AllLevelsOfFairValueHierarchyMember
1763 Level 1 Member ifrs-full:Level1OfFairValueHierarchyMember
1764 Level 2 Member ifrs-full:Level2OfFairValueHierarchyMember
1765 Level 3 Member ifrs-full:Level3OfFairValueHierarchyMember
1766 Disclosure Of Fair Value Hierarchy Group Classifies And Discloses Fair Value Of Financial Instruments Line Items [Line Items] LineItems kb:DisclosureOfFairValueHierarchyGroupClassifiesAndDisclosesFairValueOfFinancialInstrumentsLineItems
1767 Description Of Fair Value Hierarchy Classified And Disclosed By Group Concept (Text/String) For Period kb:DescriptionOfFairValueHierarchyClassifiedAndDisclosedByGroup
1768 24070101 - Disclosure - Due from Financial Institutions_Details Of Due From Financial Institution(Details) Network

*

*

 http://www.kbfg.com/role/DueFromFinancialInstitutionsDetailsOfDueFromFinancialInstitutionsDetails
1769 Schedule Of Cash And Cash Equivalents Table [Table] Table

*

*

 us-gaap:ScheduleOfCashAndCashEquivalentsTable
1770 Cash And Cash Equivalents Axis [Axis] Axis us-gaap:CashAndCashEquivalentsAxis
1771 Total Member us-gaap:RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember
1772 Due from financial institutions in Korean won Member kb:DueFromFinancialInstitutionsInKoreanWonMember
1773 Due from Bank of Korea Member kb:DueFromBankOfKoreaMember
1774 Bank of Korea Member kb:BankOfKorea1Member
1775 Due from banks Member kb:DueFromBanksMember
1776 KEB Hana Bank and others Member kb:KEBHanaBankAndOthersMember
1777 Due from others Member kb:DueFromOthersInKoreanWonMember
1778 Kyobo Securities Co., Ltd. and others Member kb:KyoboSecuritiesCoLtdAndOthersMember
1779 Due from financial institutions in foreign currencies Member kb:DueFromFinancialInstitutionsInForeignCurrenciesMember
1780 Due from banks in foreign currencies Member kb:DueFromBanksInForeignCurrenciesMember
1781 Bank of Korea and others Member kb:BankOfKoreaAndOthersMember
1782 Time deposits Member us-gaap:BankTimeDepositsMember
1783 AOZORA BANK and others Member kb:AozoraBankAndOthersMember
1784 Due from others Member kb:DueFromOthersInForeignCurrenciesMember
1785 Societe Generale and others Member kb:SocieteGeneraleAndOthersMember
1786 Range Axis [Axis] Axis ifrs-full:RangeAxis
1787 Ranges Member [Domain] Member ifrs-full:RangesMember
1788 Bottom Of Range Member [Member] Member ifrs-full:BottomOfRangeMember
1789 Top Of Range Member [Member] Member ifrs-full:TopOfRangeMember
1790 Cash And Cash Equivalents Line Items [Line Items] LineItems us-gaap:CashAndCashEquivalentsLineItems
1791 Due From Financial Institutions Concept (Monetary) As Of Debit kb:DueFromFinancialInstitutions
1792 Interest rate(%) Concept (Percent) As Of kb:InterestRateOfDueFromFinancialInstitutions
1793 24070102 - Disclosure - Due from Financial Institutions_Restricted Cash From Financial Institutions(Details) Network

*

*

 http://www.kbfg.com/role/DueFromFinancialInstitutionsRestrictedCashFromFinancialInstitutionsDetails
1794 Schedule Of Restricted Cash And Cash Equivalents Table [Table] Table

*

*

 us-gaap:ScheduleOfRestrictedCashAndCashEquivalentsTable
1795 Restricted Cash And Cash Equivalents Cash And Cash Equivalents Axis [Axis] Axis us-gaap:RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
1796 Total Member us-gaap:RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember
1797 Due from financial institutions in Korean won Member kb:DueFromFinancialInstitutionsInKoreanWonMember
1798 Due from Bank of Korea Member kb:DueFromBankOfKoreaMember
1799 Bank of Korea Act Member kb:BankOfKorea1Member
1800 Due from banks Member kb:DueFromBanksMember
1801 Citibank Korea Inc. and others Member kb:CitibankKoreaIncAndOthersMember
1802 Due from others Member kb:DueFromOthersInKoreanWonMember
1803 NH Investment Securities and others Member kb:NHInvestmentSecuritiesAndOthersMember
1804 Due from financial institutions in foreign currencies Member kb:DueFromFinancialInstitutionsInForeignCurrenciesMember
1805 Due from banks in foreign currencies Member kb:DueFromBanksInForeignCurrenciesMember
1806 Bank of Korea and others Member kb:BankOfKoreaAndOthersMember
1807 Time deposit in foreign currencies Member us-gaap:BankTimeDepositsMember
1808 China Construction Bank NY Branch and others Member kb:ChinaConstructionBankNYBranchAndOthersMember
1809 Due from others Member kb:DueFromOthersInForeignCurrenciesMember
1810 Societe Generale and others Member kb:SocieteGeneraleAndOthersMember
1811 Restricted Cash And Cash Equivalents Items Line Items [Line Items] LineItems us-gaap:RestrictedCashAndCashEquivalentsItemsLineItems
1812 Reason for restriction Concept (Monetary) As Of Debit kb:RestrictedDueFromFinancialInstitutions
1813 Restricted Cash Equivalents Nature Of Restriction Description Concept (Text/String) For Period us-gaap:RestrictedCashEquivalentsNatureOfRestrictionDescription
1814 24080101 - Disclosure - Assets pledged as collateral_Details Of Assets Pledged As Collateral(Details) Network

*

*

 http://www.kbfg.com/role/AssetsPledgedAsCollateralDetailsOfAssetsPledgedAsCollateralDetails
1815 Financial Instruments Owned And Pledged As Collateral Table [Table] Table

*

*

 us-gaap:FinancialInstrumentsOwnedAndPledgedAsCollateralTable
1816 Financial Instruments Owned And Pledged As Collateral Axis [Axis] Axis us-gaap:FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
1817 Assets pledged Member us-gaap:FinancialInstrumentsOwnedAndPledgedAsCollateralTypeDomain
1818 Due from banks Member kb:DueFromBanksMember
1819 Financial assets held for trading Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTradingCategoryMember
1820 Available-for-sale financial assets Member ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
1821 Held-to-maturity financial assets Member ifrs-full:HeldtomaturityInvestmentsCategoryMember
1822 Mortgage loans Member ifrs-full:MortgagesMember
1823 Land and buildings Member us-gaap:RealEstateMember
1824 Class Of Financing Receivable Type Of Borrower Axis [Axis] Axis us-gaap:ClassOfFinancingReceivableTypeOfBorrowerAxis
1825 Pledgee Member us-gaap:ClassOfFinancingReceivableTypeOfBorrowerDomain
1826 Korea Federation of Savings Banks and others Member kb:KoreaFederationOfSavingsBanksAndOthersMember
1827 Korea Securities Depository and others Member kb:KoreaSecuritiesDepositoryAndOthers1Member
1828 Korea Securities Depository and others Member kb:KoreaSecuritiesDepositoryAndOthers2Member
1829 Bank of Korea Member kb:BankOfKorea1Member
1830 Bank of Korea Member kb:BankOfKorea2Member
1831 Samsung Futures Inc. and others Member kb:SamsungFuturesIncAndOthersMember
1832 KEB Hana Bank and others Member kb:KEBHanaBankAndOthersMember
1833 Korea Exchange, Inc. and others Member kb:KoreaExchangeIncAndOthersMember
1834 Natixis Real Estate Capital LLC and others Member kb:NatixisRealEstateCapitalLLCAndOthersMember
1835 Others Member kb:OtherPledgeesMember
1836 Financial Instruments Owned And Pledged As Collateral Line Items [Line Items] LineItems us-gaap:FinancialInstrumentsOwnedAndPledgedAsCollateralLineItems
1837 Carrying amount Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsPledgedAsCollateralForLiabilitiesOrContingentLiabilities
1838 Reason of pledge Concept (Text/String) For Period kb:NatureOfAssetsPledgedAsCollateralDescription
1839 24080102 - Disclosure - Assets pledged as collateral_Securities(Details) Network

*

*

 http://www.kbfg.com/role/AssetsPledgedAsCollateralSecuritiesDetails
1840 The Fair Values Of Collateral Available To Sell Or Repledge And Collateral Sold Or Repledged Table [Table] Table

*

*

 kb:TheFairValuesOfCollateralAvailableToSellOrRepledgeAndCollateralSoldOrRepledgedTable
1841 Collateral Axis [Axis] Axis us-gaap:CollateralAxis
1842 Collateral Domain [Domain] Member us-gaap:CollateralDomain
1843 Securities Member kb:SecuritiesMember
1844 The Fair Values Of Collateral Available To Sell Or Repledge And Collateral Sold Or Repledged Line Items [Line Items] LineItems kb:TheFairValuesOfCollateralAvailableToSellOrRepledgeAndCollateralSoldOrRepledgedLineItems
1845 Fair value of collateral held Concept (Monetary) As Of Debit ifrs-full:AssetsHeldAsCollateralPermittedToBeSoldOrRepledgedAtFairValue
1846 Fair value of collateral sold or repledged Concept (Monetary) As Of Debit ifrs-full:AssetsSoldOrRepledgedAsCollateralAtFairValue
1847 Total Concept (Monetary) As Of Debit kb:TheFairValuesOfCollateralAvailableToSellOrRepledgedDeductedCollateralSoldOrRepledged
1848 24090101 - Disclosure - Derivative Financial Instruments and Hedge Accounting_Detailed Information About Hedging Instruments(Details) Network

*

*

 http://www.kbfg.com/role/DerivativeFinancialInstrumentsAndHedgeAccountingDetailedInformationAboutHedgingInstrumentsDetails
1849 Disclosure Of Detailed Information About Hedging Instruments Table [Table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutHedgingInstrumentsTable
1850 Hedging Instruments Axis [Axis] Axis ifrs-full:HedgingInstrumentsAxis
1851 Total Member ifrs-full:HedgingInstrumentsMember
1852 Sub-total Member us-gaap:InterestRateContractMember
1853 Futures Member kb:InterestRateFutureMember
1854 Swaps Member us-gaap:InterestRateSwapMember
1855 Options Member kb:InterestRateOptionMember
1856 Sub-total Member us-gaap:ForeignExchangeContractMember
1857 Forwards Member us-gaap:ForeignExchangeForwardMember
1858 Futures Member us-gaap:ForeignExchangeFutureMember
1859 Swaps Member us-gaap:CurrencySwapMember
1860 Options Member us-gaap:ForeignExchangeOptionMember
1861 Sub-total Member us-gaap:EquityContractMember
1862 Futures Member kb:EquityFutureMember
1863 Swaps Member us-gaap:EquitySwapMember
1864 Options Member us-gaap:StockOptionMember
1865 Sub-total Member us-gaap:CreditRiskContractMember
1866 Swaps Member kb:CreditRiskSwapMember
1867 Sub-total Member us-gaap:CommodityContractMember
1868 Futures Member kb:CommodityFutureMember
1869 Swaps Member kb:CommoditySwapMember
1870 Options Member us-gaap:CommodityOptionMember
1871 Other Member us-gaap:OtherContractMember
1872 Types Of Hedges Axis [Axis] Axis ifrs-full:TypesOfHedgesAxis
1873 Types Of Hedges Member [Domain] Member ifrs-full:TypesOfHedgesMember
1874 Not Designated As Hedging Instrument Trading Member [Member] Member us-gaap:NotDesignatedAsHedgingInstrumentTradingMember
1875 Fair Valie Hedge Member ifrs-full:FairValueHedgesMember
1876 Cash Flow Hedge Member ifrs-full:CashFlowHedgesMember
1877 Hedge on Net Investments in Foreign Operations Member ifrs-full:HedgesOfNetInvestmentInForeignOperationsMember
1878 Disclosure Of Detailed Information About Hedging Instruments Line Items [Line Items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems
1879 Nominal Amount Of Hedging Instrument Concept (Monetary) As Of ifrs-full:NotionalAmount
1880 Assets Concept (Monetary) As Of Debit ifrs-full:DerivativeFinancialAssetsHeldForTrading
1881 Liabilities Concept (Monetary) As Of Credit ifrs-full:DerivativeFinancialLiabilitiesHeldForTrading
1882 Description Of Nature Of Risks Being Hedged Concept (Text/String) For Period ifrs-full:DescriptionOfNatureOfRisksBeingHedged
1883 24090102 - Disclosure - Derivative Financial Instruments and Hedge Accounting_Gains And Losses From Hedging Instruments(Details) Network

*

*

 http://www.kbfg.com/role/DerivativeFinancialInstrumentsAndHedgeAccountingGainsAndLossesFromHedgingInstrumentsDetails
1884 Disclosure Of Information About Amounts That Affected Statement Of Comprehensive Income As Result Of Hedge Accounting Table [Table] Table

*

*

 ifrs-full:DisclosureOfInformationAboutAmountsThatAffectedStatementOfComprehensiveIncomeAsResultOfHedgeAccountingTable
1885 Types Of Hedges Axis [Axis] Axis ifrs-full:TypesOfHedgesAxis
1886 Types Of Hedges Member [Domain] Member ifrs-full:TypesOfHedgesMember
1887 Fair Value Hedges Member [Member] Member ifrs-full:FairValueHedgesMember
1888 Cash Flow Hedges Member [Member] Member ifrs-full:CashFlowHedgesMember
1889 Hedges Of Net Investment In Foreign Operations Member [Member] Member ifrs-full:HedgesOfNetInvestmentInForeignOperationsMember
1890 Disclosure Of Information About Amounts That Affected Statement Of Comprehensive Income As Result Of Hedge Accounting Line Items [Line Items] LineItems ifrs-full:DisclosureOfInformationAboutAmountsThatAffectedStatementOfComprehensiveIncomeAsResultOfHedgeAccountingLineItems
1891 Gains Losses On Fair Value Hedges Abstract [Abstract] Abstract kb:GainsLossesOnFairValueHedgesAbstract
1892 Gains(losses) on hedging instruments Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnHedgingInstrument
1893 Gains(losses) on the hedged items attributable to the hedged risk Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnHedgedItemAttributableToHedgedRisk
1894 Total Concept (Monetary) For Period Credit kb:TotalGainsLossesOnFairValueHedges
1895 Gain Loss On Hedge Ineffectiveness Abstract [Abstract] Abstract ifrs-full:GainLossOnHedgeIneffectivenessAbstract
1896 Gains(losses) on hedging instruments Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnCashFlowHedgesBeforeTax
1897 Effective gains(losses) from cash flow hedging instruments Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeBeforeTaxCashFlowHedges
1898 Ineffective gains(losses) from cash flow hedging instruments Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnIneffectivenessOfCashFlowHedgesRecognisedInProfitOrLoss
1899 Gains(losses) on hedging instruments Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnHedgesOfNetInvestmentsInForeignOperationsBeforeTax
1900 Effective portion of gain(loss) on hedges of net investments in foreign operations Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeBeforeTaxHedgesOfNetInvestmentsInForeignOperations
1901 Ineffective portion of gain on hedges of net investments in foreign operations Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnIneffectivenessOfHedgesOfNetInvestmentsInForeignOperations
1902 Cash Flow Hedges Abstract [Abstrac] Abstract ifrs-full:CashFlowHedgesAbstract
1903 Amount recognized in other comprehensive income Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeBeforeTaxCashFlowHedges
1904 Amount reclassified from equity to profit or loss Concept (Monetary) For Period Debit ifrs-full:ReclassificationAdjustmentsOnCashFlowHedgesBeforeTax
1905 Tax effect Concept (Monetary) For Period Debit kb:IncomeTaxEffectOfCashFlowHedges
1906 Total Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnCashFlowHedgesNetOfTax
1907 Hedges Of Net Investments In Foreign Operations Abstract [Abstract] Abstract ifrs-full:HedgesOfNetInvestmentsInForeignOperationsAbstract
1908 Amount recognized in other comprehensive income Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeBeforeTaxHedgesOfNetInvestmentsInForeignOperations
1909 Tax effect Concept (Monetary) For Period Debit ifrs-full:IncomeTaxRelatingToHedgesOfNetInvestmentsInForeignOperationsOfOtherComprehensiveIncome
1910 Amount recognized in other comprehensive income, net of tax Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnHedgesOfNetInvestmentsInForeignOperationsNetOfTax
1911 24090103 - Disclosure - Derivative Financial Instruments and Hedge Accounting_Fair Value Of Non-Derivative Financial Instruments(Details) Network

*

*

 http://www.kbfg.com/role/DerivativeFinancialInstrumentsAndHedgeAccountingFairValueOfNon-DerivativeFinancialInstrumentsDetails
1912 Implied Table Table

*

*

 implied:Table
1913 Non Derivative Financial Instruments Designated As Hedging Instruments At Fair Value Abstract [Abstract] Abstract kb:NonDerivativeFinancialInstrumentsDesignatedAsHedgingInstrumentsAtFairValueAbstract
1914 Deposits in foreign currencies Concept (Monetary) For Period Debit kb:DepositsInForeignCurrencies
1915 Financial debentures in foreign currencies Concept (Monetary) For Period Debit kb:FinancialDebenturesInForeignCurrencies
1916 24100101 - Disclosure - Loans_Details Of Loans(Details) Network

*

*

 http://www.kbfg.com/role/LoansDetailsOfLoansDetails
1917 Details Of Loans And Receivables Table [Table] Table

*

*

 kb:DetailsOfLoansAndReceivablesTable
1918 Carrying Amount Accumulated Depreciation Amortisation And Impairment And Gross Carrying Amount Axis [Axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
1919 Carrying amount Member ifrs-full:CarryingAmountMember
1920 Loans Member kb:GrossCarryingAmountExcludingInDeferredLoanOriginationFeesAndCostMember
1921 Deferred loan origination fees and costs Member kb:DeferredLoanOriginationFeesAndCostsMember
1922 Less: Allowances Member ifrs-full:AccumulatedImpairmentMember
1923 Details Of Loans Line Items [Line Items] LineItems kb:DetailsOfLoansLineItems
1924 Loans And Receivables Concept (Monetary) As Of Debit ifrs-full:LoansAndReceivables
1925 24100102 - Disclosure - Loans_Details Of Loans For Other Banks(Details) Network

*

*

 http://www.kbfg.com/role/LoansDetailsOfLoansForOtherBanksDetails
1926 Details Of Loans Other Than Banks Table [Table] Table

*

*

 kb:DetailsOfLoansOtherThanBanksTable
1927 Carrying Amount Accumulated Depreciation Amortisation And Impairment And Gross Carrying Amount Axis [Axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
1928 Carrying amount Member ifrs-full:CarryingAmountMember
1929 Loans Member ifrs-full:GrossCarryingAmountMember
1930 Less: Allowances Member ifrs-full:AccumulatedImpairmentMember
1931 Details Of Loans Other Than Banks Line Items [Line Items] LineItems kb:DetailsOfLoansOtherThanBanksLineItems
1932 Loans Other Than Banks Concept (Monetary) As Of Debit kb:LoansOtherThanBanks
1933 24100103 - Disclosure - Loans_Details Of Loan Types And Customer Types Of Loans To Customers Other Than Banks(Details) Network

*

*

 http://www.kbfg.com/role/LoansDetailsOfLoanTypesAndCustomerTypesOfLoansToCustomersOtherThanBanksDetails
1934 Details Of Loans Excluding In Other Than Banks Table [Table] Table

*

*

 kb:DetailsOfLoansExcludingInOtherThanBanksTable
1935 Types Of Customers Axis [Axis] Axis ifrs-full:TypesOfCustomersAxis
1936 Types Of Customers Member [Domain] Member ifrs-full:TypesOfCustomersMember
1937 Retail Member ifrs-full:ConsumerLoansMember
1938 Corporate Member ifrs-full:CorporateLoansMember
1939 Credit card Member us-gaap:CreditCardReceivablesMember
1940 Accounts Notes Loans And Financing Receivable By Receivable Type Axis [Axis] Axis us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
1941 Receivable Type Domain[Domain] Member us-gaap:ReceivableTypeDomain
1942 Loans in Korean won Member kb:LoansInKoreanWonMember
1943 Loans in foreign currencies Member kb:LoansInForeignCurrenciesMember
1944 Domestic import usance bills Member kb:DomesticImportUsanceBillsMember
1945 Off-shore funding loans Member kb:OffShoreFundingLoansMember
1946 Call loans Member kb:CallLoansMember
1947 Bills bought in Korean won Member kb:BillsBoughtInKoreanWonMember
1948 Bills bought in foreign currencies Member kb:BillsBoughtInForeignCurrenciesMember
1949 Guarantee payments under payment guarantee Member kb:GuaranteePaymentsUnderPaymentGuaranteeMember
1950 Credit card receivables in Korean won Member kb:CreditCardReceivablesInKoreanWonMember
1951 Credit card receivables in foreign currencies Member kb:CreditCardReceivablesInForeignCurrenciesMember
1952 Reverse repurchase agreements Member kb:ReverseRepurchaseAgreementsMember
1953 Privately placed bonds Member kb:PrivatelyPlacedBondsMember
1954 Factored receivables Member kb:FactoredReceivablesMember
1955 Lease receivables Member ifrs-full:LeaseReceivablesMember
1956 Loans for installment credit Member kb:LoansForInstallmentCreditMember
1957 Carrying Amount Accumulated Depreciation Amortisation And Impairment And Gross Carrying Amount Axis [Axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
1958 Carrying Amount Member [Domain] Member ifrs-full:CarryingAmountMember
1959 Gross Carrying Amount Member [Member] Member ifrs-full:GrossCarryingAmountMember
1960 Less: Allowances Member ifrs-full:AccumulatedImpairmentMember
1961 Details Of Loans Excluding In Other Than Banks Line Items [Line Items] LineItems kb:DetailsOfLoansExcludingInOtherThanBanksLineItems
1962 Proportions (%) Concept (Percent) As Of kb:PortionOfLoansExcludingInOtherThanBanksGrossCarryingAmount
1963 Loans Excluding In Other Than Banks Concept (Monetary) As Of Debit kb:LoansExcludingInOtherThanBanks
1964 24100104 - Disclosure - Loans_The Changes In Deferred Loan Origination Fees And Costs(Details) Network

*

*

 http://www.kbfg.com/role/LoansTheChangesInDeferredLoanOriginationFeesAndCostsDetails
1965 Deferred Loan Origination Fees And Costs Table [Table] Table

*

*

 kb:DeferredLoanOriginationFeesAndCostsTable
1966 Deferred Loan Origination Fees And Costs Axis [Axis] Axis kb:DeferredLoanOriginationFeesAndCostsAxis
1967 Deferred Loan Origination Fees And Costs Domain[Domain] Member kb:DeferredLoanOriginationFeesAndCostsDomain
1968 Deferred Loan Origination Costs Member [Member] Member kb:DeferredLoanOriginationCostsMember
1969 Loans in Korean won Member kb:DeferredLoanOriginationCostsInKoreanMember
1970 Other origination costs Member kb:OtherOriginationCostsMember
1971 Sub-total Member kb:DeferredLoanOriginationFeesMember
1972 Loans in Korean won Member kb:DeferredLoanOriginationFeesInKoreanMember
1973 Other origination fees Member kb:OtherOriginationFeeMember
1974 Deferred Loan Origination Fees And Costs Line Items [Line Items] LineItems kb:DeferredLoanOriginationFeesAndCostsLineItems
1975 Beginning Concept (Monetary) As Of Credit kb:DeferredLoanOriginationFeesAndCosts
1976 Reconciliation Of Changes In Deferred Loan Origination Fees And Costs Abstract [Abstract] Abstract kb:ReconciliationOfChangesInDeferredLoanOriginationFeesAndCostsAbstract
1977 Increase Concept (Monetary) For Period kb:IncreaseDeferredLoanOriginationFeesAndCosts
1978 Decrease Concept (Monetary) For Period kb:DecreaseDeferredLoanOriginationFeesAndCosts
1979 Business Combination Concept (Monetary) For Period kb:ChangesInDeferredLoanOriginationFeesAndCostsFromBusinessCombination
1980 Others Concept (Monetary) For Period kb:OtherChangesInDeferredLoanOriginationFeesAndCosts
1981 Ending Concept (Monetary) As Of Credit kb:DeferredLoanOriginationFeesAndCosts
1982 24110101 - Disclosure - Allowances for Loan Losses_Changes In The Allowances For Loan Losses(Details) Network

*

*

 http://www.kbfg.com/role/AllowancesForLoanLossesChangesInTheAllowancesForLoanLossesDetails
1983 Disclosure Of Changes In The Allowance Account For Credit Losses Of Loans Table [Table] Table

*

*

 kb:DisclosureOfChangesInTheAllowanceAccountForCreditLossesOfLoansTable
1984 Types Of Customers Axis [Axis] Axis ifrs-full:TypesOfCustomersAxis
1985 Types Of Customers Member [Domain] Member ifrs-full:TypesOfCustomersMember
1986 Retail Member ifrs-full:ConsumerLoansMember
1987 Corporate Member ifrs-full:CorporateLoansMember
1988 Credit card Member us-gaap:CreditCardReceivablesMember
1989 Disclosure Of Changes In The Allowance Account For Credit Losses Of Loans Line Items [Line Items] LineItems kb:DisclosureOfChangesInTheAllowanceAccountForCreditLossesOfLoansLineItems
1990 Beginning Concept (Monetary) As Of Credit kb:AllowanceAccountForCreditLossesOfLoans
1991 Changes In Allowance Account For Credit Losses Of Loans Abstract [Abstract] Abstract kb:ChangesInAllowanceAccountForCreditLossesOfLoansAbstract
1992 Written off Concept (Monetary) For Period Debit kb:WriteOffsAllowanceAccountForCreditLossesOfLoans
1993 Recoveries from written off loans Concept (Monetary) For Period Credit kb:IncreaseDueToRecoveriesFromWriteOffsAllowanceAccountForCreditLossesOfLoans
1994 Sale and repurchase Concept (Monetary) For Period Debit kb:DecreaseDueToSalesAndRepurchaseLoanAllowanceAccountForCreditLossesOfLoans
1995 Provision Concept (Monetary) For Period Debit kb:UtilisationAllowanceAccountForCreditLossesOfLoans
1996 Increase Due To Business Combination Allowance Account For Credit Losses Of Loans Concept (Monetary) For Period Credit kb:IncreaseDueToBusinessCombinationAllowanceAccountForCreditLossesOfLoans
1997 Other changes Concept (Monetary) As Of Credit kb:newItemIncreaseDecreaseThroughOtherChangesAllowanceAccountForCreditLossesOfLoans
1998 Ending Concept (Monetary) As Of Credit kb:AllowanceAccountForCreditLossesOfLoans
1999 24120101 - Disclosure - Financial Assets at Fair Value through Profit or Loss and Financial Investments_Financial Assets At Fair Value Through Profit Or Loss And Financial Investments(Details) Network

*

*

 http://www.kbfg.com/role/FinancialAssetsAtFairValueThroughProfitOrLossAndFinancialInvestmentsFinancialAssetsAtFairValueThroughProfitOrLossAndFinancialInvestmentsDetails
2000 Disclosure Of Financial Assets At Fair Value Through Profit Or Loss And Financial Investments Table [Table] Table

*

*

 kb:DisclosureOfFinancialAssetsAtFairValueThroughProfitOrLossAndFinancialInvestmentsTable
2001 Categories Of Financial Assets Axis [Axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
2002 Financial Assets Category Member [Domain] Member ifrs-full:FinancialAssetsCategoryMember
2003 Financial assets held for trading Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTradingCategoryMember
2004 Financial assets designated at fair value through profit and loss Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember
2005 Available-for-sale financial assets Member ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
2006 Held-to-maturity financial assets Member ifrs-full:HeldtomaturityInvestmentsCategoryMember
2007 Classes Of Financial Assets Axis [Axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
2008 Financial Assets Member [Domain] Member ifrs-full:FinancialAssetsMember
2009 Debt securities Member ifrs-full:DebtSecuritiesMember
2010 Government and public bonds Member kb:GovernmentAndPublicBondsMember
2011 Financial bonds Member kb:FinancialBondsMember
2012 Corporate bonds Member us-gaap:CorporateBondSecuritiesMember
2013 Asset backed securities Member us-gaap:AssetBackedSecuritiesMember
2014 Others Member us-gaap:OtherDebtSecuritiesMember
2015 Equity securities Member us-gaap:EquitySecuritiesMember
2016 Stocks Member kb:StocksMember
2017 Stocks And Others Member [Member] Member kb:StocksAndOthersMember
2018 Equity investments and others Member kb:EquityInvestmentsAndOthersMember
2019 Beneficiary certificates Member kb:BeneficiaryCertificatesMember
2020 Derivative linked securities Member kb:DerivativeLinkedSecuritiesMember
2021 Privately placed bonds Member kb:PrivatelyPlacedBondsMember
2022 Other financial assets Member kb:OtherFinancialAssetsMember
2023 Details Of Financial Assets At Fair Value Through Profit Or Loss And Financial Investments Line Items [Line Items] LineItems kb:DetailsOfFinancialAssetsAtFairValueThroughProfitOrLossAndFinancialInvestmentsLineItems
2024 Financial Assets At Fair Value Through Profit Or Loss Abstract [Abstract] Abstract ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossAbstract
2025 Financial assets held for trading Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTrading
2026 Financial assets designated at fair value through profit or loss Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossDesignatedAsUponInitialRecognition
2027 Total financial assets at fair value through profit or loss Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLoss
2028 Financial Investments Abstract [Abstract] Abstract kb:FinancialInvestmentsAbstract
2029 Available for sale financial assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAvailableforsale
2030 Held to maturity financial assets Concept (Monetary) As Of Debit ifrs-full:HeldtomaturityInvestments
2031 Financial investments Concept (Monetary) As Of Debit kb:FinancialInvestments
2032 24120102 - Disclosure - Financial Assets at Fair Value through Profit or Loss and Financial Investments_The Impairment Losses And The Reversal Of Impairment Losses In Financial Investments (Details) Network

*

*

 http://www.kbfg.com/role/FinancialAssetsAtFairValueThroughProfitOrLossAndFinancialInvestmentsTheImpairmentLossesAndTheReversalOfImpairmentLossesInFinancialInvestmentsDetails
2033 Disclosure Of Impairment Loss On Financial Investments Table [Table] Table

*

*

 kb:DisclosureOfImpairmentLossOnFinancialInvestmentsTable
2034 Categories Of Financial Assets Axis [Axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
2035 Financial Assets Category Member [Domain] Member ifrs-full:FinancialAssetsCategoryMember
2036 Available-for-sale financial assets Member ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
2037 Disclosure Of Impairment Loss On Financial Investments Line Items [Line Items] LineItems kb:DisclosureOfImpairmentLossOnFinancialInvestmentsLineItems
2038 Impairment Concept (Monetary) For Period Debit kb:ImpairmentLossOnFinancialInvestments
2039 Reversal Of Impairment Loss On Financial Investments Concept (Monetary) For Period Credit kb:ReversalOfImpairmentLossOnFinancialInvestments
2040 Net Concept (Monetary) For Period Debit kb:NetImpairmentLossOnFinancialInvestments
2041 24130101 - Disclosure - Investments in Associates and Joint Ventures_Investments In Associates(Details) Network

*

*

 http://www.kbfg.com/role/InvestmentsInAssociatesInvestmentsInAssociatesDetails
2042 Disclosure of associates and joint ventures [Table] Table

*

*

 kb:DisclosureOfSignificantInvestmentsInAssociatesAndJointVenturesTable
2043 Associates and joint ventures [Axis] Axis kb:SignificantInvestmentsInAssociatesAndJointVenturesAxis
2044 Associates and joint ventures Member kb:EntitysTotalForAssociatesAndJointVenturesMember
2045 Associates and Joint Ventures Member ifrs-full:AssociatesMember
2046 KB Pre IPO Secondary Venture Fund 1st Member kb:KBPreIPOSecondaryVentureFund1stMember
2047 KB GwS Private Securities Investment Trust Member kb:KBGwSPrivateSecuritiesInvestmentTrustMember
2048 KB Star Office Private Real Estate Investment Trust No.1 Member kb:KBStarofficePrivaterealestateInvestmentTrustNo1Member
2049 Sun Surgery Center Inc. Member kb:SunSurgeryCenterIncMember
2050 Dae-A Leisure Co., Ltd. Member kb:DaeALeisureCoLtdMember
2051 Doosung Metal Co., Ltd. Member kb:DoosungMetalCoLtdMember
2052 RAND Bio Science Co., Ltd. Member kb:RANDBioScienceMember
2053 Balhae Infrastructure Company Member kb:BalhaeInfrastructureFundMember
2054 Bungaejangter Inc. Member kb:BungaejangterIncMember
2055 Aju Good Technology Venture Fund Member kb:AjuGoodTechnologyVentureFundMember
2056 Acts Co., Ltd. Member kb:ActsCoLtdMember
2057 SY Auto Capital Co., Ltd. Member kb:SYAutoCapitalCoLtdMember
2058 Wise Asset Management Co., Ltd. Member kb:WiseAssetManagementMember
2059 Incheon Bridge Co., Ltd. Member kb:IncheonBridgeCoLtdMember
2060 Jungdong Steel Co., Ltd. Member kb:JungdongSteelCoLtdMember
2061 Kendae Co., Ltd. Member kb:KendaeMember
2062 Daesang Techlon Co., Ltd. Member kb:DaesangTechlonCoLtdMember
2063 Dongjo Co., Ltd. Member kb:DongjoCoLtdMember
2064 Dpaps Co., Ltd. Member kb:DpapsCoLtdMember
2065 Big Dipper Co., Ltd. Member kb:BigDipperCoLtdMember
2066 Builton Co., Ltd. Member kb:BuiltonCoLtdMember
2067 Shinla Construction Co., Ltd. Member kb:ShinlaConstructionCoLtdMember
2068 Shinhwa Underwear Co., Ltd. Member kb:ShinhwaUnderwearCoLtdMember
2069 A-PRO Co., Ltd. Member kb:APROCoLtdMember
2070 MJT&I Co., Ltd. Member kb:MJTAndICoLtdMember
2071 Inno Lending Co., Ltd. Member kb:InnoLendingCoLtdMember
2072 Jaeyang Industry Co., Ltd. Member kb:JaeyangndustryMember
2073 Jungdo Co., Ltd. Member kb:JungdoCoLtdMember
2074 Jinseung Tech Co., Ltd. Member kb:JinseungTechCoLtdMember
2075 Terra Co., Ltd. Member kb:TerraCoLtdMember
2076 Paycoms Co., Ltd. Member kb:PaycomsCoLtdMember
2077 Food Factory Co., Ltd. Member kb:FoodFactoryCoLtdMember
2078 Korea NM Tech Co., Ltd. Member kb:KoreaNMTechCoLtdMember
2079 KB IGen Private Equity Fund No.1 Member kb:KBGlenwoodPrivateEquityFundMember
2080 KB No.8 Special Purpose Acquisition Company Member kb:KBNo8SpecialPurposeAcquisitionCompanyMember
2081 KB No.9 Special Purpose Acquisition Company Member kb:KBNo9SpecialPurposeAcquisitionCompanyMember
2082 KB No.10 Special Purpose Acquisition Company Member kb:KBNo10SpecialPurposeAcquisitionCompanyMember
2083 KB No.11 Special Purpose Acquisition Company Member kb:KBNo11SpecialPurposeAcquisitionCompanyMember
2084 Member kb:KBPrivateEquityFundIIIMember
2085 Korea Credit Bureau Co., Ltd. Member kb:KoreaCreditBureauCoLtdMember
2086 KoFC KBIC Frontier Champ 2010-5(PEF) Member kb:KoFCKBICFrontierChamp20105PEFMember
2087 KoFC POSCO HANHWA KB Shared Growth Private Equity Fund No. 2 Member kb:KoFCPOSCOHANHWAKBSharedGrowthPrivateEquityFundNo2Member
2088 Keystone-Hyundai Securities No. 1 Private Equity Fund Member kb:KeystoneHyundaiSecuritiesNo1PrivateEquityFundMember
2089 POSCO-KB Shipbuilding Fund Member kb:POSCOKBShipbuildingFundMember
2090 Hyundai Tongyang Agrifood Private Equity Fund Member kb:HyundaiTongyangAgrifoodPrivateEquityFundMember
2091 JSC Bank CenterCredit Member kb:JSCBankCenterCreditMember
2092 Ordinary share Member kb:JSCBankCenterCreditOrdinaryShareMember
2093 Preference share Member kb:JSCBankCenterCreditPreferenceShareMember
2094 IMM Investment 5th PRIVATE EQUITY FUND Member kb:IMMInvestment5thPRIVATEEQUITYFUNDMember
2095 isMedia Co., Ltd. Member kb:IsMediaMember
2096 KB Insurance Co., Ltd. Member kb:KBInsuranceCoLtdMember
2097 Ejade Co., Ltd. Member kb:EjadeCoLtdMember
2098 KBIC Private Equity Fund No 3 Member kb:KBICPrivateEquityFundNo32Member
2099 UAMCO., Ltd. Member kb:UAMCOLtdMember
2100 United PF 1st Recovery Private Equity Fund Member kb:UnitedPF1stRecoveryPrivateEquityFundMember
2101 Myungwon Tech Co., Ltd. Member kb:MyungwonTechCoLtdMember
2102 NPS KBIC Private Equity Fund No 1 Member kb:NPSKBICPrivateEquityFundNo12Member
2103 Sawnics Co., Ltd. Member kb:SawnicsCoLtdMember
2104 KB No.5 Special Purpose Acquisition Company Member kb:KBNo5SpecialPurposeAcquisitionCompanyMember
2105 KB No.6 Special Purpose Acquisition Company Member kb:KBNo6SpecialPurposeAcquisitionCompanyMember
2106 KB No.7 Special Purpose Acquisition Company Member kb:KBNo7SpecialPurposeAcquisitionCompanyMember
2107 Joint ventures Member ifrs-full:JointVenturesMember
2108 KB-KDBC New Technology Business Investment Fund Member kb:KBKDBCNewTechnologyBusinessFundMember
2109 Disclosure of associates and joint ventures [Line Items] LineItems kb:DisclosureOfSignificantInvestmentsInAssociatesAndJointVenturesLineItems
2110 Ownership (%) Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInAssociate
2111 Ownership (%) Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInJointVenture
2112 Acquistion cost Concept (Monetary) As Of Debit kb:InvestmentsInAssociatsAndJointVentures
2113 Share of net asset amount Concept (Monetary) As Of Credit us-gaap:EquityMethodInvestmentUnderlyingEquityInNetAssets
2114 Carrying amount Concept (Monetary) As Of Debit ifrs-full:InvestmentAccountedForUsingEquityMethod
2115 Industry Concept (Text/String) For Period ifrs-full:PrincipalPlaceOfBusinessOfAssociate
2116 Industry Concept (Text/String) For Period ifrs-full:PrincipalPlaceOfBusinessOfJointVenture
2117 Location Concept (Text/String) For Period ifrs-full:CountryOfIncorporationOrResidenceOfAssociate
2118 Location Concept (Text/String) For Period ifrs-full:CountryOfIncorporationOfJointVenture
2119 Fair value of investments In associates where price quotations Published Concept (Monetary) As Of Debit ifrs-full:FairValueOfInvestmentsInAssociatesWherePriceQuotationsPublished
2120 Description of reasons why presumption investor does not have significant influence is overcome when its interest in investee is less than twenty per cent Concept (Text/String) For Period ifrs-full:DescriptionOfReasonsWhyPresumptionThatInterestOfLessThanTwentyPerCentInAssociateIsOvercome
2121 Description Of reasons why presumption that interest of more than twenty per cent in associate is overcome Concept (Text/String) For Period ifrs-full:DescriptionOfReasonsWhyPresumptionThatInterestOfMoreThanTwentyPerCentInAssociateIsOvercome
2122 Description of nature of entitys relationship with associate Concept (Text/String) For Period ifrs-full:DescriptionOfNatureOfEntitysRelationshipWithAssociate
2123 Description of nature of entity's relationship with joint venture Concept (Text/String) For Period ifrs-full:DescriptionOfNatureOfEntitysRelationshipWithJointVenture
2124 24130102 - Disclosure - Investments in Associates and Joint Ventures_Summarized Financial Information On Major Associates Adjustments To Carrying Amount Of Investment In Associates And Dividends Received (Details) Network

*

*

 http://www.kbfg.com/role/InvestmentsInAssociatesSummarizedFinancialInformationOnMajorAssociatesAdjustmentsToCarryingAmountOfInvestmentInAssociatesAndDividendsReceivedDetails
2125 Disclosure of significant investments in major associates and joint ventures [Table] Table

*

*

 kb:DisclosureOfSignificantInvestmentsInMajorAssociatesAndJointVenturesTable
2126 Associates and joint ventures [Axis] Axis kb:SignificantInvestmentsInAssociatesAndJointVenturesAxis
2127 Associates and joint ventures Member kb:EntitysTotalForAssociatesAndJointVenturesMember
2128 Associates and Joint Ventures Member ifrs-full:AssociatesMember
2129 Major Associates Member [Member] Member kb:MajorAssociatesMember
2130 KB Pre IPO Secondary Venture Fund 1st Member kb:KBPreIPOSecondaryVentureFund1stMember
2131 KB GwS Private Securities Investment Trust Member kb:KBGwSPrivateSecuritiesInvestmentTrustMember
2132 KB Star Office Private Real Estate Investment Trust No.1 Member kb:KBStarofficePrivaterealestateInvestmentTrustNo1Member
2133 Sun Surgery Center Inc. Member kb:SunSurgeryCenterIncMember
2134 RAND Bio Science Co., Ltd. Member kb:RANDBioScienceMember
2135 Balhae Infrastructure Company Member kb:BalhaeInfrastructureFundMember
2136 Bungaejangter Inc. Member kb:BungaejangterIncMember
2137 Aju Good Technology Venture Fund Member kb:AjuGoodTechnologyVentureFundMember
2138 Acts Co., Ltd. Member kb:ActsCoLtdMember
2139 SY Auto Capital Co., Ltd. Member kb:SYAutoCapitalCoLtdMember
2140 Incheon Bridge Co., Ltd. Member kb:IncheonBridgeCoLtdMember
2141 Big Dipper Co., Ltd. Member kb:BigDipperCoLtdMember
2142 Builton Co., Ltd. Member kb:BuiltonCoLtdMember
2143 A-PRO Co., Ltd. Member kb:APROCoLtdMember
2144 Inno Lending Co., Ltd. Member kb:InnoLendingCoLtdMember
2145 Paycoms Co., Ltd. Member kb:PaycomsCoLtdMember
2146 Food Factory Co., Ltd. Member kb:FoodFactoryCoLtdMember
2147 KB IGen Private Equity Fund No.1 Member kb:KBGlenwoodPrivateEquityFundMember
2148 KB No.8 Special Purpose Acquisition Company Member kb:KBNo8SpecialPurposeAcquisitionCompanyMember
2149 KB No.9 Special Purpose Acquisition Company Member kb:KBNo9SpecialPurposeAcquisitionCompanyMember
2150 KB No.10 Special Purpose Acquisition Company Member kb:KBNo10SpecialPurposeAcquisitionCompanyMember
2151 KB No.11 Special Purpose Acquisition Company Member kb:KBNo11SpecialPurposeAcquisitionCompanyMember
2152 Member kb:KBPrivateEquityFundIIIMember
2153 Korea Credit Bureau Co., Ltd. Member kb:KoreaCreditBureauCoLtdMember
2154 KoFC KBIC Frontier Champ 2010-5(PEF) Member kb:KoFCKBICFrontierChamp20105PEFMember
2155 KoFC POSCO HANHWA KB Shared Growth Private Equity Fund No. 2 Member kb:KoFCPOSCOHANHWAKBSharedGrowthPrivateEquityFundNo2Member
2156 Keystone-Hyundai Securities No. 1 Private Equity Fund Member kb:KeystoneHyundaiSecuritiesNo1PrivateEquityFundMember
2157 POSCO-KB Shipbuilding Fund Member kb:POSCOKBShipbuildingFundMember
2158 Hyundai Tongyang Agrifood Private Equity Fund Member kb:HyundaiTongyangAgrifoodPrivateEquityFundMember
2159 KB Insurance Co., Ltd. Member kb:KBInsuranceCoLtdMember
2160 initial acquisition 22.59% Member kb:InitialAcquisitionMember
2161 additional acquisition 10.70% Member kb:AdditionalAcquisition1Member
2162 additional acquisition 6.52% Member kb:AdditionalAcquisition2Member
2163 JSC Bank CenterCredit Member kb:JSCBankCenterCreditMember
2164 KBIC Private Equity Fund No 3 Member kb:KBICPrivateEquityFundNo32Member
2165 IMM Investment 5th PRIVATE EQUITY FUND Member kb:IMMInvestment5thPRIVATEEQUITYFUNDMember
2166 UAMCO., Ltd. Member kb:UAMCOLtdMember
2167 United PF 1st Recovery Private Equity Fund Member kb:UnitedPF1stRecoveryPrivateEquityFundMember
2168 NPS KBIC Private Equity Fund No 1 Member kb:NPSKBICPrivateEquityFundNo12Member
2169 KB No.5 Special Purpose Acquisition Company Member kb:KBNo5SpecialPurposeAcquisitionCompanyMember
2170 KB No.6 Special Purpose Acquisition Company Member kb:KBNo6SpecialPurposeAcquisitionCompanyMember
2171 KB No.7 Special Purpose Acquisition Company Member kb:KBNo7SpecialPurposeAcquisitionCompanyMember
2172 isMedia Co., Ltd. Member kb:IsMediaMember
2173 Joint ventures Member ifrs-full:JointVenturesMember
2174 Major joint ventures [Member] Member kb:MajorJointVenturesMember
2175 KB-KDBC New Technology Business Investment Fund Member kb:KBKDBCNewTechnologyBusinessFundMember
2176 Disclosure of significant investments in major associates and joint ventures line items [Line Items] LineItems kb:DisclosureOfSignificantInvestmentsInMajorAssociatesAndJointVenturesLineItems
2177 Total assets Concept (Monetary) As Of Debit us-gaap:EquityMethodInvestmentSummarizedFinancialInformationAssets
2178 Total liabilities Concept (Monetary) As Of Credit us-gaap:EquityMethodInvestmentSummarizedFinancialInformationLiabilities
2179 Share capital Concept (Monetary) As Of Credit us-gaap:EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital
2180 Equity Concept (Monetary) As Of Credit us-gaap:EquityMethodInvestmentSummarizedFinancialInformationEquity
2181 Share of net asset amount Concept (Monetary) As Of Credit us-gaap:EquityMethodInvestmentUnderlyingEquityInNetAssets
2182 Unrealized gainslosses Concept (Monetary) As Of Debit us-gaap:EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity
2183 Consolidated carrying amount Concept (Monetary) As Of Debit ifrs-full:InvestmentsInSubsidiariesJointVenturesAndAssociates
2184 Operating income Concept (Monetary) For Period Credit us-gaap:EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems
2185 Profit loss Concept (Monetary) For Period Credit us-gaap:EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
2186 Other comprehensive income Concept (Monetary) For Period Credit kb:EquityMethodInvestmentSummarizedFinancialInformationOtherComprehensiveIncome
2187 Total comprehensive income Concept (Monetary) For Period Credit kb:EquityMethodInvestmentSummarizedFinancialInformationComprehensiveIncome
2188 Dividends Concept (Monetary) For Period Debit ifrs-full:DividendsReceivedFromInvestmentsAccountedForUsingEquityMethodClassifiedAsInvestingActivities
2189 Description Of Basis Of Preparation Of Summarised Financial Information Of Associate Concept (Text/String) For Period ifrs-full:DescriptionOfBasisOfPreparationOfSummarisedFinancialInformationOfAssociate
2190 Description of basis of preparation of summarised financial information of associate Concept (Text/String) For Period ifrs-full:DescriptionOfBasisOfPreparationOfSummarisedFinancialInformationOfJointVenture
2191 24130103 - Disclosure - Investments in Associates and Joint Ventures_Changes In Investments In Associates(Details) Network

*

*

 http://www.kbfg.com/role/InvestmentsInAssociatesChangesInInvestmentsInAssociatesDetails
2192 Disclosure of changes in investments in associates and joint ventures [Table] Table

*

*

 kb:DisclosureOfChangesInInvestmentsInAssociatesAndJointVenturesTable
2193 Associates and joint ventures [Axis] Axis kb:SignificantInvestmentsInAssociatesAndJointVenturesAxis
2194 Entity's total for associates and joint ventures[Domain] Member kb:EntitysTotalForAssociatesAndJointVenturesMember
2195 Associates and Joint Ventures Member ifrs-full:AssociatesMember
2196 KB Pre IPO Secondary Venture Fund 1st Member kb:KBPreIPOSecondaryVentureFund1stMember
2197 KB GwS Private Securities Investment Trust Member kb:KBGwSPrivateSecuritiesInvestmentTrustMember
2198 KB Star Office Private Real Estate Investment Trust No.1 Member kb:KBStarofficePrivaterealestateInvestmentTrustNo1Member
2199 Sun Surgery Center Inc. Member kb:SunSurgeryCenterIncMember
2200 Kyobo 7 Special Purpose Acquisition Co., Ltd. Member kb:Kyobo7SpecialPurposeAcquisitionCoLtdMember
2201 RAND Bio Science Co., Ltd. Member kb:RANDBioScienceMember
2202 Balhae Infrastructure Fund Member kb:BalhaeInfrastructureFundMember
2203 Bungaejangter Inc. Member kb:BungaejangterIncMember
2204 IMM Investment 5th PRIVATE EQUITY FUND Member kb:IMMInvestment5thPRIVATEEQUITYFUNDMember
2205 Aju Good Technology Venture Fund Member kb:AjuGoodTechnologyVentureFundMember
2206 Acts Co., Ltd. Member kb:ActsCoLtdMember
2207 SY Auto Capital Co., Ltd. Member kb:SYAutoCapitalCoLtdMember
2208 isMedia Co., Ltd. Member kb:IsMediaMember
2209 Incheon Bridge Co., Ltd. Member kb:IncheonBridgeCoLtdMember
2210 KB Insurance Co., Ltd. Member kb:KBInsuranceCoLtdMember
2211 Kendae Co., Ltd. Member kb:KendaeMember
2212 Big Dipper Co., Ltd. Member kb:BigDipperCoLtdMember
2213 Builton Co., Ltd. Member kb:BuiltonCoLtdMember
2214 Shinhwa Underwear Co., Ltd. Member kb:ShinhwaUnderwearCoLtdMember
2215 A-PRO Co., Ltd. Member kb:APROCoLtdMember
2216 MJT&I Co., Ltd. Member kb:MJTAndICoLtdMember
2217 Inno Lending Co., Ltd. Member kb:InnoLendingCoLtdMember
2218 Korbi Co., Ltd. Member kb:KorbiCoLtdMember
2219 Terra Co., Ltd. Member kb:TerraCoLtdMember
2220 Paycoms Co., Ltd. Member kb:PaycomsCoLtdMember
2221 Food Factory Co., Ltd. Member kb:FoodFactoryCoLtdMember
2222 KBIC Private Equity Fund No 3 Member kb:KBICPrivateEquityFundNo32Member
2223 KB IGen Private Equity Fund No.1 Member kb:KBGlenwoodPrivateEquityFundMember
2224 KB No.8 Special Purpose Acquisition Company Member kb:KBNo8SpecialPurposeAcquisitionCompanyMember
2225 KB No.9 Special Purpose Acquisition Company Member kb:KBNo9SpecialPurposeAcquisitionCompanyMember
2226 KB No.10 Special Purpose Acquisition Company Member kb:KBNo10SpecialPurposeAcquisitionCompanyMember
2227 KB No.11 Special Purpose Acquisition Company Member kb:KBNo11SpecialPurposeAcquisitionCompanyMember
2228 Member kb:KBPrivateEquityFundIIIMember
2229 Korea Credit Bureau Co., Ltd. Member kb:KoreaCreditBureauCoLtdMember
2230 KoFC KBIC Frontier Champ 2010-5(PEF) Member kb:KoFCKBICFrontierChamp20105PEFMember
2231 KoFC POSCO HANHWA KB Shared Growth Private Equity Fund No. 2 Member kb:KoFCPOSCOHANHWAKBSharedGrowthPrivateEquityFundNo2Member
2232 Keystone-Hyundai Securities No. 1 Private Equity Fund Member kb:KeystoneHyundaiSecuritiesNo1PrivateEquityFundMember
2233 POSCO-KB Shipbuilding Fund Member kb:POSCOKBShipbuildingFundMember
2234 Hyundai Tongyang Agrifood Private Equity Fund Member kb:HyundaiTongyangAgrifoodPrivateEquityFundMember
2235 Hyundai Securities Co., Ltd. Member kb:HyundaiSecuritiesCoLtdMember
2236 UAMCO., Ltd. Member kb:UAMCOLtdMember
2237 JSC Bank CenterCredit Member kb:JSCBankCenterCreditMember
2238 United PF 1st Recovery Private Equity Fund Member kb:UnitedPF1stRecoveryPrivateEquityFundMember
2239 Jungdong Steel Co., Ltd. Member kb:JungdongSteelCoLtdMember
2240 Sawnics Co., Ltd. Member kb:SawnicsCoLtdMember
2241 KB No.5 Special Purpose Acquisition Company Member kb:KBNo5SpecialPurposeAcquisitionCompanyMember
2242 KB No.6 Special Purpose Acquisition Company Member kb:KBNo6SpecialPurposeAcquisitionCompanyMember
2243 KB No.7 Special Purpose Acquisition Company Member kb:KBNo7SpecialPurposeAcquisitionCompanyMember
2244 Ch engineering co ltd Member kb:CHEngineeringCoLtdMember
2245 E-clear International Co., Ltd. Member kb:EClearInternationalCoLtdMember
2246 KB No.3 Special Purpose Acquisition Company Member kb:KBNo3SpecialPurposeAcquisitionCompanyMember
2247 KB No.4 Special Purpose Acquisition Company Member kb:KBNo4SpecialPurposeAcquisitionCompanyMember
2248 Joint ventures Member ifrs-full:JointVenturesMember
2249 KB-KDBC New Technology Business Investment Fund Member kb:KBKDBCNewTechnologyBusinessFundMember
2250 Disclosure Of Changes In Investments In Associates Line Items [Line Items] LineItems kb:DisclosureOfChangesInInvestmentsInAssociatesLineItems
2251 Beginning Concept (Monetary) As Of Debit ifrs-full:InvestmentsInSubsidiariesJointVenturesAndAssociates
2252 Acquisition and others Concept (Monetary) For Period Credit ifrs-full:PurchaseOfInterestsInInvestmentsAccountedForUsingEquityMethod
2253 Disposal and others Concept (Monetary) For Period Debit us-gaap:EquityMethodInvestmentSoldCarryingAmount
2254 Dividends Concept (Monetary) For Period Debit ifrs-full:DividendsReceivedFromInvestmentsAccountedForUsingEquityMethodClassifiedAsInvestingActivities
2255 Gains(losses) on equity-method accounting Concept (Monetary) For Period Credit ifrs-full:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
2256 Other comprehensive income Concept (Monetary) For Period Credit ifrs-full:ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodBeforeTax
2257 Others Concept (Monetary) For Period Debit kb:OtherChangesInInvestmentsInAssociatesAndJointVentures
2258 Carrying amount Concept (Monetary) As Of Debit ifrs-full:InvestmentsInSubsidiariesJointVenturesAndAssociates
2259 Equity Method Investment Realized Gain Loss On Disposal Concept (Monetary) For Period Credit us-gaap:EquityMethodInvestmentRealizedGainLossOnDisposal
2260 Gain Loss On Bargain Purchase Associates Accounts Using Equity Method Concept (Monetary) For Period Debit kb:GainLossOnBargainPurchaseAssociatesAccountsUsingEquityMethod
2261 Description of nature of entitys relationship with associate Concept (Text/String) For Period ifrs-full:DescriptionOfNatureOfEntitysRelationshipWithAssociate
2262 Description Of Other Changes In Investments In Associates Concept (Text/String) For Period kb:DescriptionOfOtherChangesInInvestmentsInAssociates
2263 24130104 - Disclosure - Investments in Associates and Joint Ventures_Accumulated Unrecognized Share Of Losses In Investments In Associates (Details) Network

*

*

 http://www.kbfg.com/role/InvestmentsInAssociatesAccumulatedUnrecognizedShareOfLossesInInvestmentsInAssociatesDetails
2264 Disclosure Of Accumulated Unrecognized Share Of Losses In Investments In Associates Table [Table] Table

*

*

 kb:DisclosureOfAccumulatedUnrecognizedShareOfLossesInInvestmentsInAssociatesTable
2265 Significant Investments In Associates Axis [Axis] Axis ifrs-full:SignificantInvestmentsInAssociatesAxis
2266 Entitys Total For Associates Member [Domain] Member ifrs-full:EntitysTotalForAssociatesMember
2267 Associates and Joint Ventures Member ifrs-full:AssociatesMember
2268 Doosung Metal Co., Ltd. Member kb:DoosungMetalCoLtdMember
2269 Incheon Bridge Co., Ltd. Member kb:IncheonBridgeCoLtdMember
2270 Jungdong Steel Co., Ltd. Member kb:JungdongSteelCoLtdMember
2271 Dpaps Co., Ltd. Member kb:DpapsCoLtdMember
2272 Shinla Construction Co., Ltd. Member kb:ShinlaConstructionCoLtdMember
2273 Ejade Co., Ltd. Member kb:EjadeCoLtdMember
2274 JSC Bank CenterCredit Member kb:JSCBankCenterCreditMember
2275 Myeongwon Tech Co., Ltd Member kb:MyeongwonTechCoLtdMember
2276 Disclosure Of Accumulated Unrecognized Share Of Losses In Investments In Associates Line Items [Line Items] LineItems kb:DisclosureOfAccumulatedUnrecognizedShareOfLossesInInvestmentsInAssociatesLineItems
2277 Unrecognized loss Concept (Monetary) For Period Debit ifrs-full:UnrecognisedShareOfLossesOfAssociates
2278 Accumulated unrecognized loss Concept (Monetary) As Of Credit ifrs-full:CumulativeUnrecognisedShareOfLossesOfAssociates
2279 Equity method investment unrealized intercompany profit loss not eliminated description Concept (Text/String) For Period us-gaap:EquityMethodInvestmentUnrealizedIntercompanyProfitLossNotEliminatedDescription
2280 24140101 - Disclosure - Property and Equipment and Investment Properties_Property And Equipment(Details) Network

*

*

 http://www.kbfg.com/role/PropertyAndEquipmentAndInvestmentPropertiesPropertyAndEquipmentDetails
2281 Disclosure Of Property Plant And Equipment Table [Table] Table

*

*

 ifrs-full:DisclosureOfPropertyPlantAndEquipmentTable
2282 Classes Of Property Plant And Equipment Axis [Axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
2283 Property Plant And Equipment Member [Domain] Member ifrs-full:PropertyPlantAndEquipmentMember
2284 Land Member ifrs-full:LandMember
2285 Buildings Member ifrs-full:BuildingsMember
2286 Leasehold improvements Member ifrs-full:LeaseholdImprovementsMember
2287 Equipment and vehicles Member us-gaap:MachineryAndEquipmentMember
2288 Construction in progress Member ifrs-full:ConstructionInProgressMember
2289 Assets Held Under Capital Leases Member [Member] Member us-gaap:AssetsHeldUnderCapitalLeasesMember
2290 Carrying Amount Accumulated Depreciation Amortisation And Impairment And Gross Carrying Amount Axis [Axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
2291 Carrying Amount Member [Domain] Member ifrs-full:CarryingAmountMember
2292 Gross Carrying Amount Member ifrs-full:GrossCarryingAmountMember
2293 Accumulated depreciation Member ifrs-full:AccumulatedDepreciationAndAmortisationMember
2294 Accumulated Impairment Member [Member] Member ifrs-full:AccumulatedImpairmentMember
2295 Disclosure Of Property Plant And Equipment Line Items [Line Items] LineItems ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
2296 Carrying amount Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
2297 Reconciliation Of Changes In Accumulated Impairment Losses Of Property And Equipment Abstract [Abstract] Abstract ifrs-full:ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract
2298 Beginning(PPE) Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
2299 Changes In Property Plant And Equipment Abstract [Abstract] Abstract ifrs-full:ChangesInPropertyPlantAndEquipmentAbstract
2300 Acquisition Concept (Monetary) For Period Debit ifrs-full:AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment
2301 Transfers Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughTransfersPropertyPlantAndEquipment
2302 Disposal Concept (Monetary) For Period Credit ifrs-full:DisposalsPropertyPlantAndEquipment
2303 Depreciation Concept (Monetary) For Period ifrs-full:DepreciationPropertyPlantAndEquipment
2304 Business combination Concept (Monetary) For Period Debit ifrs-full:AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipment
2305 Others Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughOtherChangesPropertyPlantAndEquipment
2306 Discription Of Increase Decrease Through Transfers From To Investment Property Property Plant And Equipment Concept (Text/String) For Period kb:DiscriptionOfIncreaseDecreaseThroughTransfersFromToInvestmentPropertyPropertyPlantAndEquipment
2307 Depreciation Recognised In Profit Or Loss Concept (Monetary) For Period Debit kb:DepreciationRecognisedInProfitOrLoss
2308 Ending(PPE) Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
2309 Reconciliation Of Changes In Accumulated Impairment Losses Of Property And Equipment [Abstract] Abstract kb:ReconciliationOfChangesInAccumulatedImpairmentLossesOfPropertyAndEquipmentAbstract
2310 Beginning(Accumulated impairment of PPE) Concept (Monetary) As Of Credit kb:AccumulatedImpairmentOfPropertyPlantAndEquipment
2311 Changes In Accumulated Impairment Of Property Plant And Equipment Abstract [Abstract] Abstract kb:ChangesInAccumulatedImpairmentOfPropertyPlantAndEquipmentAbstract
2312 Impairment Concept (Monetary) For Period ifrs-full:ImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipment
2313 Reversal Concept (Monetary) For Period ifrs-full:ReversalOfImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipment
2314 Business combination Concept (Monetary) For Period Credit kb:IncreaseDecreaseThroughBusinessCombinationsAccumulatedImpairmentOfPropertyPlantAndEquipment
2315 Disposal and Others Concept (Monetary) For Period Credit kb:IncreaseDecreaseThroughOtherChangesAccumulatedImpairmentOfPropertyPlantAndEquipment
2316 Ending(Accumaulated impairment of PPE) Concept (Monetary) As Of Credit kb:AccumulatedImpairmentOfPropertyPlantAndEquipment
2317 24140102 - Disclosure - Property and Equipment and Investment Properties_Investment Property(Details) Network

*

*

 http://www.kbfg.com/role/PropertyAndEquipmentAndInvestmentPropertiesInvestmentPropertyDetails
2318 Disclosure Of Investment Property Table [Table] Table

*

*

 ifrs-full:DisclosureOfInvestmentPropertyTable
2319 Types Of Investment Property Axis [Axis] Axis ifrs-full:TypesOfInvestmentPropertyAxis
2320 Investment Property Member [Domain] Member ifrs-full:InvestmentPropertyMember
2321 Land Member ifrs-full:LandMember
2322 Buildings Member ifrs-full:BuildingsMember
2323 Carrying Amount Accumulated Depreciation Amortisation And Impairment And Gross Carrying Amount Axis [Axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
2324 Carrying Amount Member [Domain] Member ifrs-full:CarryingAmountMember
2325 Gross Carrying Amount Member ifrs-full:GrossCarryingAmountMember
2326 Accumulated depreciation Member ifrs-full:AccumulatedDepreciationAndAmortisationMember
2327 Accumulated Impairment Member [Member] Member ifrs-full:AccumulatedImpairmentMember
2328 Disclosure Of Investment Property Line Items [Line Items] LineItems ifrs-full:DisclosureOfInvestmentPropertyLineItems
2329 Carrying amount Concept (Monetary) As Of Debit ifrs-full:InvestmentProperty
2330 Fair value Concept (Monetary) As Of Debit kb:InvestmentPropertyAtFairValue
2331 Reconciliation Of Changes In Investment Property Abstract [Abstract] Abstract ifrs-full:ReconciliationOfChangesInInvestmentPropertyAbstract
2332 Beginning Concept (Monetary) As Of Debit ifrs-full:InvestmentProperty
2333 Changes In Investment Property Abstract [Abstract] Abstract ifrs-full:ChangesInInvestmentPropertyAbstract
2334 Acquisition Concept (Monetary) For Period Debit ifrs-full:AdditionsFromAcquisitionsInvestmentProperty
2335 Transfers Concept (Monetary) For Period Debit ifrs-full:TransferFromInvestmentPropertyUnderConstructionOrDevelopmentInvestmentProperty
2336 Disposal Concept (Monetary) For Period Credit ifrs-full:DisposalsInvestmentProperty
2337 Depreciation Concept (Monetary) For Period ifrs-full:DepreciationInvestmentProperty
2338 Business combination Concept (Monetary) For Period Debit ifrs-full:AcquisitionsThroughBusinessCombinationsInvestmentProperty
2339 Others Concept (Monetary) For Period Debit kb:OtherIncreaseDecreasePropertyPlantAndEquipment
2340 Ending Concept (Monetary) As Of Debit ifrs-full:InvestmentProperty
2341 24140103 - Disclosure - Property and Equipment and Investment Properties_Valuation Technique And Input Variables That Are Used To Measure The Fair Value Of Investment Property (Details) Network

*

*

 http://www.kbfg.com/role/PropertyAndEquipmentAndInvestmentPropertiesValuationTechniqueAndInputVariablesThatAreUsedToMeasureTheFairValueOfInvestmentPropertyDetails
2342 Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Investment Property Table [Table] Table

*

*

 kb:DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfInvestmentPropertyTable
2343 Classes Of Assets Axis [Axis] Axis ifrs-full:ClassesOfAssetsAxis
2344 Classes Of Assets Member [Domain] Member ifrs-full:ClassesOfAssetsMember
2345 Land and buildings Member ifrs-full:InvestmentPropertyMember
2346 Valuation Techniques Used In Fair Value Measurement Axis [Axis] Axis ifrs-full:ValuationTechniquesUsedInFairValueMeasurementAxis
2347 Valuation technique Member ifrs-full:ValuationTechniquesMember
2348 Cost Approach Method Member ifrs-full:CostApproachMember
2349 Market comparision Method Member ifrs-full:MarketApproachMember
2350 Income approach Member ifrs-full:IncomeApproachMember
2351 Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets Line Items [Line Items] LineItems ifrs-full:DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsLineItems
2352 Fair value Concept (Monetary) As Of Debit kb:InvestmentPropertyAtFairValue
2353 Description Of Inputs Used In Fair Value Measurement Investment Property Concept (Text/String) For Period kb:DescriptionOfInputsUsedInFairValueMeasurementInvestmentProperty
2354 Description Of Extent To Which Fair Value Of Investment Property Is Based On Valuation By Independent Valuer Concept (Text/String) For Period ifrs-full:DescriptionOfExtentToWhichFairValueOfInvestmentPropertyIsBasedOnValuationByIndependentValuer
2355 Description Of Investment Property Of Level Of Fair Value Hierarchy Within Which Fair Value Measurement Is Categorised Concept (Text/String) For Period kb:DescriptionOfInvestmentPropertyOfLevelOfFairValueHierarchyWithinWhichFairValueMeasurementIsCategorised
2356 24140104 - Disclosure - Property and Equipment and Investment Properties_Rental income from the above investment properties (Details) Network

*

*

 http://www.kbfg.com/role/PropertyAndEquipmentAndInvestmentPropertiesRentalIncomeFromTheAboveInvestmentPropertiestmentPropertyDetails
2357 Implied Table Table

*

*

 implied:Table
2358 Rental Income From Investment Property Net Of Direct Operating Expense Abstract [Abstract] Abstract ifrs-full:RentalIncomeFromInvestmentPropertyNetOfDirectOperatingExpenseAbstract
2359 Rental income from the investment properties Concept (Monetary) For Period Credit ifrs-full:RentalIncomeFromInvestmentProperty
2360 24150101 - Disclosure - Intangible Assets_Intangible Assets(Details) Network

*

*

 http://www.kbfg.com/role/IntangibleAssetsIntangibleAssetsDetails
2361 Disclosure Of Intangible Assets Table [Table] Table

*

*

 ifrs-full:DisclosureOfIntangibleAssetsTable
2362 Classes Of Intangible Assets And Goodwill Axis [Axis] Axis ifrs-full:ClassesOfIntangibleAssetsAndGoodwillAxis
2363 Intangible Assets And Goodwill Member [Domain] Member ifrs-full:IntangibleAssetsAndGoodwillMember
2364 Goodwill Member ifrs-full:GoodwillMember
2365 Other intangible assets Member ifrs-full:IntangibleAssetsOtherThanGoodwillMember
2366 Industrial property rights Member ifrs-full:CopyrightsPatentsAndOtherIndustrialPropertyRightsServiceAndOperatingRightsMember
2367 Software Member ifrs-full:ComputerSoftwareMember
2368 Other intangible assets Member ifrs-full:OtherIntangibleAssetsMember
2369 Value of business acquired (VOBA) Member ifrs-full:ValueOfBusinessAcquiredMember
2370 Finance leases assets Member kb:IntangibleAssetsHeldUnderCapitalLeasesMember
2371 Carrying Amount Accumulated Depreciation Amortisation And Impairment And Gross Carrying Amount Axis [Axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
2372 Carrying Amount Member [Domain] Member ifrs-full:CarryingAmountMember
2373 Gross Carrying Amount Member ifrs-full:GrossCarryingAmountMember
2374 Accumulated depreciation Member ifrs-full:AccumulatedDepreciationAndAmortisationMember
2375 Accumulated Impairment Member [Member] Member ifrs-full:AccumulatedImpairmentMember
2376 Others Member kb:OtherAdjustmentMember
2377 Disclosure Of Intangible Assets Line Items [Line Items] LineItems ifrs-full:DisclosureOfIntangibleAssetsLineItems
2378 Carrying Amount Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsAndGoodwill
2379 Reconciliation of changes in intangible assets and goodwill [abstract] Abstract ifrs-full:ReconciliationOfChangesInIntangibleAssetsAndGoodwillAbstract
2380 Beginning Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsAndGoodwill
2381 Changes In Intangible Assets Other Than Goodwill Abstract [Abstract] Abstract ifrs-full:ChangesInIntangibleAssetsOtherThanGoodwillAbstract
2382 Acquisition Concept (Monetary) For Period Debit ifrs-full:AdditionsOtherThanThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill
2383 Disposal Concept (Monetary) For Period Credit ifrs-full:DisposalsIntangibleAssetsOtherThanGoodwill
2384 Transfer Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughTransfersIntangibleAssetsOtherThanGoodwill
2385 Amortization Concept (Monetary) For Period ifrs-full:AmortisationIntangibleAssetsOtherThanGoodwill
2386 Business combination Concept (Monetary) For Period Debit ifrs-full:AcquisitionsThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill
2387 Others Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughOtherChangesIntangibleAssetsOtherThanGoodwill
2388 Line Items Including Amortisation Of Intangible Assets Intangible Assets Other Than Goodwill Concept (Text/String) For Period ifrs-full:LineItemsIncludingAmortisationOfIntangibleAssetsIntangibleAssetsOtherThanGoodwill
2389 Explanation Of Main Events And Circumstances That Led To Recognition Of Impairment Losses And Reversals Of Impairment Losses Of Intangible Assets With Indefinite Useful Life Concept (Text/String) For Period kb:ExplanationOfMainEventsAndCircumstancesThatLedToRecognitionOfImpairmentLossesAndReversalsOfImpairmentLossesOfIntangibleAssetsWithIndefiniteUsefulLife
2390 Ending Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsAndGoodwill
2391 Reconciliation Of Changes In Accumulated Impairment Losses Of Intangible Assets Intangible Assets And Goodwill Abstract [Abstract] Abstract kb:ReconciliationOfChangesInAccumulatedImpairmentLossesOfIntangibleAssetsIntangibleAssetsAndGoodwillAbstract
2392 Beginning(Accumulated Intangible) Concept (Monetary) As Of Credit kb:AccumulatedImpairmentIntangibleAssetsAndGoodwill
2393 Changes In Accumulated Impairment Intangible Assets And Goodwill Abstract [Abstract] Abstract kb:ChangesInAccumulatedImpairmentIntangibleAssetsAndGoodwillAbstract
2394 Impairment Concept (Monetary) For Period ifrs-full:ImpairmentLossRecognisedInProfitOrLossIntangibleAssetsAndGoodwill
2395 Reversal Concept (Monetary) For Period ifrs-full:ReversalOfImpairmentLossRecognisedInProfitOrLossIntangibleAssetsOtherThanGoodwill
2396 Disposal and others Concept (Monetary) For Period Debit kb:DisposalsAndOtherChangesAccumulatedImpairmentOfIntangibleAssetsOtherThanGoodwill
2397 Others Concept (Monetary) For Period Debit us-gaap:GoodwillOtherIncreaseDecrease
2398 Ending(Accumulated Intangible) Concept (Monetary) As Of Credit kb:AccumulatedImpairmentIntangibleAssetsAndGoodwill
2399 24150102 - Disclosure - Intangible Assets_Goodwill(Details) Network

*

*

 http://www.kbfg.com/role/IntangibleAssetsGoodwillDetails
2400 Schedule Of Goodwill Table [Table] Table

*

*

 us-gaap:ScheduleOfGoodwillTable
2401 Significant Investments In Subsidiaries Axis [Axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
2402 Entitys Total For Subsidiaries Member [Domain] Member ifrs-full:EntitysTotalForSubsidiariesMember
2403 Housing & Commercial Bank Member kb:HousingAndCommercialBankMember
2404 Kookmin Bank Cambodia PLC. Member kb:KookminBankCambodiaPLCMember
2405 KB Securities Co., Ltd. Member kb:KBSecuritiesCoLtdMember
2406 KB Capital Co.,Ltd. Member kb:KBCapitalCoLtdMember
2407 KB Savings Bank Co., Ltd. Member kb:KBSavingsBankCoLtdMember
2408 KB Securities Vietnam joint stock company Member kb:KBSecuritiesVietnamJointStockCompanyMember
2409 Goodwill Line Items [Line Items] LineItems us-gaap:GoodwillLineItems
2410 Acquisition cost Concept (Monetary) As Of Debit us-gaap:GoodwillGross
2411 Carrying amount Concept (Monetary) As Of Debit ifrs-full:Goodwill
2412 24150103 - Disclosure - Intangible Assets-Allocating Goodwill To Cash_Generating Units And Related Information For Impairment Testing(Details) Network

*

*

 http://www.kbfg.com/role/IntangibleAssetsAllocatingGoodwillToCashGeneratingUnitsAndRelatedInformationForImpairmentTestingDetails
2413 Disclosure Of Information For Individual Asset Or Cashgenerating Unit With Significant Amount Of Goodwill Or Intangible Assets With Indefinite Useful Lives Table [Table] Table

*

*

 ifrs-full:DisclosureOfInformationForIndividualAssetOrCashgeneratingUnitWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesTable
2414 Individual Assets Or Cashgenerating Units With Significant Amount Of Goodwill Or Intangible Assets With Indefinite Useful Lives Axis [Axis] Axis ifrs-full:IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis
2415 Entity's total for cash-generating units [Domain] Member ifrs-full:EntitysTotalForCashgeneratingUnitsMember
2416 Housing & Commercial Bank Member kb:HousingAndCommercialBankMember
2417 Retail Banking Member kb:RetailBankingMember
2418 Corporate Banking Member kb:CorporateBankingMember
2419 Kookmin Bank Cambodia PLC. Member kb:KookminBankCambodiaPLCMember
2420 KB Securities Co., Ltd. Member kb:KBSecuritiesCoLtdMember
2421 KB Capital Co.,Ltd. Member kb:KBCapitalCoLtdMember
2422 KB Savings Bank Co., Ltd. Member kb:KBSavingsBankCoLtdMember
2423 Disclosure Of Information For Individual Asset Or Cashgenerating Unit With Significant Amount Of Goodwill Or Intangible Assets With Indefinite Useful Lives Line Items [Line Items] LineItems ifrs-full:DisclosureOfInformationForIndividualAssetOrCashgeneratingUnitWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesLineItems
2424 Carrying amounts Concept (Monetary) For Period Debit kb:GoodwillAllocatedToCashGeneratingUnits
2425 Recoverable amount exceeded carrying amount Concept (Monetary) As Of Debit ifrs-full:AmountByWhichUnitsRecoverableAmountExceedsItsCarryingAmount
2426 Discount rate Concept (Percent) As Of ifrs-full:DescriptionOfDiscountRatesAppliedToCashFlowProjections
2427 Permanent growth rate Concept (Percent) As Of ifrs-full:DescriptionOfGrowthRateUsedToExtrapolateCashFlowProjections
2428 Description of basis on which unit's recoverable amount has been determined Concept (Text/String) For Period ifrs-full:DescriptionOfBasisOnWhichUnitsRecoverableAmountHasBeenDetermined
2429 Explanation of period over which management has projected cash flows Concept (Text/String) For Period ifrs-full:ExplanationOfPeriodOverWhichManagementHasProjectedCashFlows
2430 Description of key assumptions on which management has based determination of fair value less costs of disposal Concept (Text/String) For Period ifrs-full:DescriptionOfKeyAssumptionsOnWhichManagementHasBasedCashFlowProjections
2431 Explanation of value assigned to key assumption Concept (Text/String) For Period ifrs-full:ExplanationOfValueAssignedToKeyAssumption
2432 24150104 - Disclosure - Intangible Assets_The Changes In Emissions Rights(Details) Network

*

*

 http://www.kbfg.com/role/IntangibleAssetsTheChangesInEmissionsRightsDetails
2433 Disclosure Of Emissions Rights Table [Table] Table

*

*

 kb:DisclosureOfEmissionsRightsTable
2434 Appicable Year Of Emissions Rights Axis [Axis] Axis kb:AppicableYearOfEmissionsRightsAxis
2435 Appicable Year Member [Domain] Member kb:AppicableYearMember
2436 Applicable under 2015 Member kb:ApplicationUnder2015Member
2437 Applicable under 2016 Member kb:ApplicationUnder2016Member
2438 Applicable under 2017 Member kb:ApplicationUnder2017Member
2439 Disclosure Of Emissions Rights Line Items [Line Items] LineItems kb:DisclosureOfEmissionsRightsLineItems
2440 Reconciliation Of Changes In Quantity Of Emissions Rights Abstract [Abstract] Abstract kb:ReconciliationOfChangesInQuantityOfEmissionsRightsAbstract
2441 Beginning Concept (Decimal) As Of kb:QuantityOfEmissionsRights
2442 Changes In Quantity Of Emissions Rights Abstract [Abstract] Abstract kb:ChangesInQuantityOfEmissionsRightsAbstract
2443 Additional Allocation Concept (Decimal) For Period kb:QuantityOfEmissionsRightsAdditionalAllocation
2444 Free of charge Concept (Decimal) For Period kb:QuantityOfEmissionsRightsFreeOfCharges
2445 Borrowing Concept (Decimal) For Period kb:QuantityOfEmissionsRightsBorrowing
2446 Surrendered to government Concept (Decimal) For Period kb:QuantityOfEmissionsRightsSurrenderedToGovernment
2447 Cancel Concept (Decimal) For Period kb:QuantityOfEmissionsRightsCancel
2448 Ending Concept (Decimal) As Of kb:QuantityOfEmissionsRights
2449 Carrying amount Abstract kb:ReconciliationOfChangesInAmountOfEmissionsRightsAbstract
2450 Beginning Concept (Monetary) As Of Debit kb:EmissionsRights
2451 Changes In Emissions Rights Abstract [Abstract] Abstract kb:ChangesInEmissionsRightsAbstract
2452 Additional Allocation Concept (Monetary) For Period Debit kb:EmissionsRightsAdditionalAllocation
2453 Free of charges Concept (Monetary) For Period Debit kb:EmissionsRightsFreeOfCharges
2454 Borrowing Concept (Monetary) For Period Debit kb:EmissionsRightsBorrowing
2455 Surrendered to government Concept (Monetary) For Period Credit kb:EmissionsRightsSurrenderedToGovernment
2456 Cancel Concept (Monetary) For Period Credit kb:EmissionsRightsCancel
2457 Ending Concept (Monetary) As Of Debit kb:EmissionsRights
2458 24160101 - Disclosure - Deferred Income Tax Assets and Liabilities_Deferred Income Tax Assets And Liabilities(Details) Network

*

*

 http://www.kbfg.com/role/DeferredIncomeTaxAssetsAndLiabilitiesDeferredIncomeTaxAssetsAndLiabilitiesDetails
2459 Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits Table [Table] Table

*

*

 ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable
2460 Temporary Difference Type Axis [Axis] Axis kb:TemporaryDifferenceTypeAxis
2461 Temporary Difference Member [Domain] Member ifrs-full:TemporaryDifferenceMember
2462 Deductible temporary differences Member kb:DeductibleTemporaryDifferencesMember
2463 Taxable temporary differences Member kb:TaxableTemporaryDifferencesMember
2464 Offsetting of deferred income tax assets and liabilities Member kb:OffsetMember
2465 Temporary Difference Unused Tax Losses And Unused Tax Credits Axis [Axis] Axis ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis
2466 Temporary Difference Unused Tax Losses And Unused Tax Credits Member [Domain] Member ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember
2467 Gross Temporary Difference Unused Tax Losses And Unused Tax Credits Member [Member] Member kb:GrossTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember
2468 Others Member kb:ProvisionsMember
2469 Allowances for loan losses Member ifrs-full:AllowanceForCreditLossesMember
2470 Impairment losses on property and equipment Member kb:ImpairmentLossesOnPropertyAndEquipmentMember
2471 Interest on equity index linked deposits Member kb:InterestOnEquityIndexLinkedDepositsMember
2472 Share based payments Member kb:ShareBasedPaymentsMember
2473 Provisions for guarantees Member kb:ProvisionsForGuaranteesMember
2474 Gains from valuation on derivative financial instruments Member kb:GainsLossesFromValuationOnDerivativeFinancialInstrumentsMember
2475 Present value discount Member kb:PresentValueDiscountMember
2476 Losses from fair value hedged item Member kb:LossesGainsFromFairValueHedgedItemMember
2477 Accrued interest Member kb:AccruedInterestMember
2478 Deferred loan origination fees and costs Member kb:DeferredLoanOriginationFeesAndCostsMember
2479 Advnaced depreciation provision Member kb:AdvancedDepreciationProvisionMember
2480 Gains on revaluation Member kb:GainsOnRevaluationMember
2481 Investments in subsidiaries and others Member kb:InvestmentsInSubsidiariesAndOthersMember
2482 Gains on valuation of security investment Member kb:GainsOnValuationOfSecurityInvestmentMember
2483 Defined benefit liabilities Member kb:DefinedBenefitLiabilitiesMember
2484 Accrued expenses Member kb:AccruedExpensesMember
2485 Retirement insurance expense Member kb:RetirementInsuranceExpenseMember
2486 Adjustments to the prepaid contributions Member kb:AdjustmentsToThePrepaidContributionsMember
2487 Derivative linked securities Member kb:DerivativeLinkedSecuritiesMember
2488 Loss on SPE repurchase Member kb:LossOnSPERepurchasesMember
2489 Goodwill Member ifrs-full:GoodwillMember
2490 Others Member ifrs-full:OtherTemporaryDifferencesMember
2491 Unrecognized deferred income tax assets Member kb:UnrecognizedTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember
2492 Other provisions Member kb:UnrecognizedOtherProvisionsMember
2493 Loss on SPE repurchase Member kb:UnrecognizedLossOnSPERepurchasesMember
2494 Goodwill Member kb:UnrecognizedGoodwillMember
2495 Investments in subsidiaries and others Member kb:UnrecognizedInvestmentsInSubsidiariesAndOthersMember
2496 Others Member kb:UnrecognizedOtherTemporaryDifferencesMember
2497 Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits Line Items [Line Items] LineItems ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems
2498 Deferred Tax Assets And Liabilities Abstract [Abstract] Abstract ifrs-full:DeferredTaxAssetsAndLiabilitiesAbstract
2499 Assets Concept (Monetary) As Of Debit ifrs-full:DeferredTaxAssets
2500 Liabilities Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilities
2501 Net amount Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilityAsset
2502 The changes in cumulative temporary differences Abstract ifrs-full:ReconciliationOfChangesInDeferredTaxLiabilityAssetAbstract
2503 Beginning Concept (Monetary) As Of Debit kb:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCredits
2504 Changes In Temporary Difference Unused Tax Losses And Unused Tax Credits Abstract [Abstract] Abstract kb:ChangesInTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAbstract
2505 Business Combination Concept (Monetary) As Of Debit kb:BusinessCombinationTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCredits
2506 Decrease Concept (Monetary) For Period Credit kb:DecreaseTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCredits
2507 Increase Concept (Monetary) For Period Debit kb:IncreaseTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCredits
2508 Ending Concept (Monetary) As Of Debit kb:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCredits
2509 Tax rate Concept (Percent) For Period kb:ExpectedRateForTheDefferedTaxAssetsAndLiabilities
2510 Tax rate Concept (Percent) For Period kb:ApplicableTaxRateInBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsOrLiabilities
2511 Net Deferred Tax Assets And Liabilities Abstract [Abstract] Abstract ifrs-full:NetDeferredTaxAssetsAndLiabilitiesAbstract
2512 Total deferred income tax assets from deductible temporary differences Concept (Monetary) As Of Debit ifrs-full:NetDeferredTaxAssets
2513 Total deferred income tax liabilities from deductible temporary differences Concept (Monetary) As Of Credit ifrs-full:NetDeferredTaxLiabilities
2514 Total deferred income tax assets or liabilities from deductible temporary differences with business combination Concept (Monetary) As Of Debit kb:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsOrLiabilities
2515 Deductible Temporary Differences For Which No Deferred Tax Asset Is Recognised Abstract [Line Items] LineItems kb:DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognisedAbstract
2516 Deductible Temporary Differences For Which No Deferred Tax Asset Is Recognised Investments In Subsidiaries And Others Concept (Monetary) As Of Debit kb:DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognisedInvestmentsInSubsidiariesAndOthers
2517 Deductible Temporary Differences For Which No Deferred Tax Asset Is Recognised SPE Repurchases Concept (Monetary) As Of Debit kb:DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognisedSPERepurchases
2518 Deductible Temporary Differences For Which No Deferred Tax Asset Is Recognised Others Concept (Monetary) As Of Debit kb:DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognisedOthers
2519 Temporary Differences Associated With Investments In Subsidiaries Branches And Associates And Interests In Joint Ventures Abstract [Line Items] LineItems kb:TemporaryDifferencesAssociatedWithInvestmentsInSubsidiariesBranchesAndAssociatesAndInterestsInJointVenturesAbstract
2520 Taxable Temporary Differences Associated With Investments In Subsidiaries Branches And Associates And Interests In Joint Ventures Concept (Monetary) As Of Credit kb:TaxableTemporaryDifferencesAssociatedWithInvestmentsInSubsidiariesBranchesAndAssociatesAndInterestsInJointVentures
2521 Taxable Temporary Differences Associated With Business Combination Concept (Monetary) As Of Credit kb:TaxableTemporaryDifferencesAssociatedWithBusinessCombination
2522 24170101 - Disclosure - Assets Held for Sale_Assets Held For Sale (Details) Network

*

*

 http://www.kbfg.com/role/AssetsHeldForSaleAssetsHeldForSaleDetails
2523 Disclosure Of Assets Held For Sale Table [Table] Table

*

*

 kb:DisclosureOfAssetsHeldForSaleTable
2524 Assets And Liabilities Classified As Held For Sale Axis [Axis] Axis ifrs-full:AssetsAndLiabilitiesClassifiedAsHeldForSaleAxis
2525 Assets and liabilities not classified as held for sale [Domain] Member ifrs-full:AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember
2526 Assets and liabilities classified as held for sale [Member] Member ifrs-full:AssetsAndLiabilitiesClassifiedAsHeldForSaleMember
2527 Land held for sale Member ifrs-full:LandMember
2528 Buildings held for sale Member ifrs-full:BuildingsMember
2529 Carrying Amount Accumulated Depreciation Amortisation And Impairment And Gross Carrying Amount Axis [Axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
2530 Carrying Amount Member [Domain] Member ifrs-full:CarryingAmountMember
2531 Gross Carrying Amount Member ifrs-full:GrossCarryingAmountMember
2532 Accumulated Impairment Member [Member] Member ifrs-full:AccumulatedImpairmentMember
2533 Disclosure Of Assets Held For Sale Line Items [Line Items] LineItems kb:DisclosureOfAssetsHeldForSaleLineItems
2534 Carrying amount Concept (Monetary) As Of Debit ifrs-full:NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSale
2535 Fair value less costs to sell Concept (Monetary) As Of Debit kb:AssestsHeldForSaleAtFairValueLessCostsToSell
2536 Description Of Acquisition Cost Of Buildings Held For Sale Concept (Text/String) For Period kb:DescriptionOfAcquisitionCostOfBuildingsHeldForSale
2537 Reconciliation Of Changes In Accumulated Impairment Losses Of Assets Held For Sale Abstract [Abstract] Abstract kb:ReconciliationOfChangesInAccumulatedImpairmentLossesOfAssetsHeldForSaleAbstract
2538 Beginning Concept (Monetary) As Of Credit kb:AccumulatedImpairmentOfAssetsHeldForSale
2539 Changes In Accumulated Impairment Of Assets Held For Sale Abstract [Abstract] Abstract kb:ChangesInAccumulatedImpairmentOfAssetsHeldForSaleAbstract
2540 Provision Concept (Monetary) For Period Debit kb:ImpairmentLossRecognisedInProfitOrLossAssetsHeldForSale
2541 Reversal Concept (Monetary) For Period Credit kb:ReversalOfImpairmentLossRecognisedInProfitOrLossAssetsHeldForSale
2542 Others Concept (Monetary) For Period Credit kb:IncreaseDecreaseThroughOtherChangesAccumulatedImpairmentOfAssetsHeldForSale
2543 Ending Concept (Monetary) As Of Credit kb:AccumulatedImpairmentOfAssetsHeldForSale
2544 Description Of Noncurrent Asset Or Disposal Group Held For Sale Which Were Sold Or Reclassified Concept (Text/String) For Period ifrs-full:DescriptionOfNoncurrentAssetOrDisposalGroupHeldForSaleWhichWereSoldOrReclassified
2545 Explanation Of Facts And Circumstances Of Sale Or Reclassification And Expected Disposal Manner And Timing Concept (Text/String) For Period ifrs-full:ExplanationOfFactsAndCircumstancesOfSaleOrReclassificationAndExpectedDisposalMannerAndTiming
2546 24170102 - Disclosure - Assets Held for Sale_TheValuation Technique And Input Variables That Are Used To Measure The Fair Value Of Assets Held For Sale (Details) Network

*

*

 http://www.kbfg.com/role/AssetsHeldForSaleTheValuationTechniqueAndInputVariablesThatAreUsedToMeasureTheFairValueOfAssetsHeldForSaleDetails
2547 Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assests Held For Sale Table [Table] Table

*

*

 kb:DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssestsHeldForSaleTable
2548 Classes Of Assets Axis [Axis] Axis ifrs-full:ClassesOfAssetsAxis
2549 Classes Of Assets Member [Domain] Member ifrs-full:ClassesOfAssetsMember
2550 Land and buildings Member ifrs-full:NoncurrentAssetsHeldForSaleMember
2551 Valuation Techniques Used In Fair Value Measurement Axis [Axis] Axis ifrs-full:ValuationTechniquesUsedInFairValueMeasurementAxis
2552 Valuation technique Member ifrs-full:ValuationTechniquesMember
2553 Market comparison approach model Member kb:MarketApproach1Member
2554 Market comparison approach model Member kb:MarketApproach2Member
2555 Market comparison approach model Member kb:MarketApproach3Member
2556 Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assests Held For Sale Line Items [Line Items] LineItems kb:DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssestsHeldForSaleLineItems
2557 Fair value Concept (Monetary) As Of Debit kb:AssestsHeldForSaleAtFairValue
2558 Unobservable input Concept (Text/String) For Period kb:DescriptionOfInputsUsedInFairValueMeasurementAssestsHeldForSale
2559 Range of unobservable inputs Concept (Text/String) For Period kb:DescriptionOfRangeOfUnobservableInputsFairValueMeasurementAssestsHeldForSale
2560 Relationship of unobservable inputs to fair value Concept (Text/String) For Period kb:DescriptionOfHowEffectOnFairValueMeasurementDueToChangeInOneOrMoreUnobservableInputsToReflectReasonablyPossibleAlternativeAssumptionsWasCalculatedAssetsHeldForSale
2561 Description Of Valuation Processes Used In Fair Value Measurement Assets Held For Sale Concept (Text/String) For Period kb:DescriptionOfValuationProcessesUsedInFairValueMeasurementAssetsHeldForSale
2562 Additional Discription Of Adjustment Index Concept (Text/String) For Period kb:AdditionalDiscriptionOfAdjustmentIndex
2563 Description Of How Thirdparty Information Was Taken Into Account When Measuring Fair Value Assets Held For Sale Concept (Text/String) For Period kb:DescriptionOfHowThirdpartyInformationWasTakenIntoAccountWhenMeasuringFairValueAssetsHeldForSale
2564 Description Of Assets Held For Sale Of Level Of Fair Value Hierarchy Within Which Fair Value Measurement Is Categorised Concept (Text/String) For Period kb:DescriptionOfAssetsHeldForSaleOfLevelOfFairValueHierarchyWithinWhichFairValueMeasurementIsCategorised
2565 24180101 - Disclosure - Other Assets_Details Of Other Assets(Details) Network

*

*

 http://www.kbfg.com/role/OtherAssetsDetailsOfOtherAssetsDetails
2566 Other Assets Table [Table] Table

*

*

 kb:OtherAssetsTable
2567 Classes Of Assets Axis [Axis] Axis ifrs-full:ClassesOfAssetsAxis
2568 Classes Of Assets Member [Domain] Member ifrs-full:ClassesOfAssetsMember
2569 Other financial assets Member kb:OtherFinancialAssetsMember
2570 Other non financial assets Member kb:OtherNonFinancialAssetsMember
2571 Carrying Amount Accumulated Depreciation Amortisation And Impairment And Gross Carrying Amount Axis [Axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
2572 Carrying Amount Member [Domain] Member ifrs-full:CarryingAmountMember
2573 Gross Carrying Amount Member [Member] Member ifrs-full:GrossCarryingAmountMember
2574 Other receivables Member kb:OtherReceivablesMember
2575 Accrued income Member kb:AccruedIncomeMember
2576 Prepaid expenses Member kb:PrepaidExpensesMember
2577 Guarantee deposits Member kb:GuaranteeDepositsMember
2578 Domestic exchange settlement debits Member kb:DomesticExchangeSettlementDebitsMember
2579 Insurance assets Member kb:InsuranceAssestsMember
2580 Separate account assets Member kb:SeperateAccountAssetsMember
2581 Others Member kb:MiscellaneousAssetsMember
2582 Less: Allowances Member ifrs-full:AccumulatedImpairmentMember
2583 Less Present value discount Member kb:PresentValueDiscountMember
2584 Other Assests Line Items [Line Items] LineItems kb:OtherAssestsLineItems
2585 Other Assets Concept (Monetary) As Of Debit ifrs-full:OtherAssets
2586 Reconciliation Of Changes In Accumulated Impairment Losses Of Other Assets Abstract [Abstract] Abstract kb:ReconciliationOfChangesInAccumulatedImpairmentLossesOfOtherAssetsAbstract
2587 Beginning Concept (Monetary) As Of Credit kb:AccumulatedImpairmentOfOtherAssets
2588 Changes In Accumulated Impairment Of Other Assets Abstract [Abstract] Abstract kb:ChangesInAccumulatedImpairmentOfOtherAssetsAbstract
2589 Write Offs Of Impairment Loss Recognised In Profit Or Loss Other Assets Concept (Monetary) For Period Credit kb:WriteOffsOfImpairmentLossRecognisedInProfitOrLossOtherAssets
2590 Impairment Loss Recognised In Profit Or Loss Other Assets Concept (Monetary) For Period Debit kb:ImpairmentLossRecognisedInProfitOrLossOtherAssets
2591 Business combination Concept (Monetary) For Period Credit kb:IncreaseDecreaseThroughBusinessCombinationsAccumulatedImpairmentOfOtherAssets
2592 Others Concept (Monetary) For Period Credit kb:IncreaseDecreaseThroughOtherChangesAccumulatedImpairmentOfOtherAssets
2593 Ending Concept (Monetary) As Of Credit kb:AccumulatedImpairmentOfOtherAssets
2594 24190101 - Disclosure - Financial Liabilities at Fair Value through Profit or Loss_Details Of Financial Liabilities At Fair Value Through Profit Or Loss(Details) Network

*

*

 http://www.kbfg.com/role/FinancialLiabilitiesAtFairValueThroughProfitOrLossDetailsOfFinancialLiabilitiesAtFairValueThroughProfitOrLossDetails
2595 Disclosure Of Financial Liabilities Table [Table] Table

*

*

 ifrs-full:DisclosureOfFinancialLiabilitiesTable
2596 Categories Of Financial Liabilities Axis [Axis] Axis ifrs-full:CategoriesOfFinancialLiabilitiesAxis
2597 Total financial liabilities at fair value through profit or loss Member ifrs-full:FinancialLiabilitiesCategoryMember
2598 Financial liabilties held for trading Member ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossThatMeetDefinitionOfHeldForTradingCategoryMember
2599 Securities sold Member kb:SecuritiesSoldMember
2600 Other Member kb:OtherFinancialLiabilitiesHeldForTradingMember
2601 Financial liabilities designated at fair value through profit or loss Member ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember
2602 Derivative linked securities Member kb:DerivativeLinkedSecuritiesMember
2603 Disclosure Of Financial Liabilities Line Items [Line Items] LineItems ifrs-full:DisclosureOfFinancialLiabilitiesLineItems
2604 Financial liabilities at fair value through profit or loss Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLoss
2605 24190102 - Disclosure - Financial Liabilities at Fair Value through Profit or Loss_The Details Of Credit Risk Of Financial Liabilities Designated At Fair Value Through Profit Or Loss(Details) Network

*

*

 http://www.kbfg.com/role/FinancialLiabilitiesAtFairValueThroughProfitOrLossTheDetailsOfCreditRiskOfFinancialLiabilitiesDesignatedAtFairValueThroughProfitOrLossDetails
2606 Implied Table Table

*

*

 implied:Table
2607 Designated Financial Liabilities At Fair Value Through Profit Or Loss Abstract [Abstract] Abstract ifrs-full:DesignatedFinancialLiabilitiesAtFairValueThroughProfitOrLossAbstract
2608 Financial liabilities designated at fair value through profit or loss Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedAsUponInitialRecognition
2609 Changes in fair value resulting from changes in the credit risk Concept (Monetary) For Period Credit ifrs-full:ChangesInFairValueOfFinancialLiabilityAttributableToChangesInCreditRiskOfLiability
2610 Accumulated changes in fair value resulting from changes in the credit risk Concept (Monetary) As Of Credit ifrs-full:AccumulatedChangesInFairValueOfFinancialLiabilityAttributableToChangesInCreditRiskOfLiability
2611 24200101 - Disclosure - Deposits_Details Of Deposits(Details) Network

*

*

 http://www.kbfg.com/role/DepositsDetailsOfDepositsDetails
2612 Disclosure Of Deposits From Customers Table [Table] Table

*

*

 kb:DisclosureOfDepositsFromCustomersTable
2613 Types Of Deposits Axis [Axis] Axis kb:TypesOfDepositsAxis
2614 Types Of Deposits Member [Domain] Member kb:TypesOfDepositsMember
2615 Demand deposits Member us-gaap:DemandDepositsMember
2616 Demand deposits in Korean won Member kb:DemandDepositsInKoreanWonMember
2617 Demand deposits in foreign currencies Member kb:DemandDepositsInForeignCurrenciesMember
2618 Time deposits Member us-gaap:BankTimeDepositsMember
2619 Bank Time Deposits In Korean Won Member [Member] Member kb:BankTimeDepositsInKoreanWonMember
2620 Time deposits in Korean won Member kb:BankTimeDepositsInKoreanWonGrossMember
2621 Fair value adjustments on fair value hedged financial debentures in Korean won Member kb:FairValueHedgedItemsInKoreanWonMember
2622 Bank Time Deposits In Foreign Currencies Member [Member] Member kb:BankTimeDepositsInForeignCurrenciesMember
2623 Time deposits in foreign currencies Member kb:BankTimeDepositsInForeignCurrenciesGrossMember
2624 Fair value adjustments on valuation of fair value hedged items Member kb:FairValueHedgedItemsInForeignCurrenciesMember
2625 Certificates of deposits Member us-gaap:CertificatesOfDepositMember
2626 Disclosure Of Deposits From Customers Line Items [Line Items] LineItems kb:DisclosureOfDepositsFromCustomersLineItems
2627 Deposits Concept (Monetary) As Of Credit ifrs-full:DepositsFromCustomers
2628 24210101 - Disclosure - Debts_Details Of Debts (Details) Network

*

*

 http://www.kbfg.com/role/DebtsDetailsOfDebtsDetails
2629 Implied Table Table

*

*

 implied:Table
2630 Borrowings Abstract [Abstract] Abstract ifrs-full:BorrowingsAbstract
2631 Borrowings Concept (Monetary) As Of Credit ifrs-full:Borrowings
2632 Repurchase Agreements And Others Concept (Monetary) As Of Credit kb:RepurchaseAgreementsAndOthers
2633 Call Money Concept (Monetary) As Of Credit kb:CallMoney
2634 Total Concept (Monetary) As Of Credit kb:Debts
2635 24210102 - Disclosure - Debts_Details Of Borrowings(Details) Network

*

*

 http://www.kbfg.com/role/DebtsDetailsOfBorrowingsDetails
2636 Disclosure Of Detailed Information About Borrowings Table [Table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsTable
2637 Borrowings By Name Axis [Axis] Axis ifrs-full:BorrowingsByNameAxis
2638 Lenders Member ifrs-full:BorrowingsByNameMember
2639 Borrowings in Korean won Member kb:KoreanWonMember
2640 Borrowings from the Bank of Korea Member kb:BorrowingsFromTheBankOfKoreaMember
2641 Bank of Korea Act Member kb:BankOfKorea1Member
2642 Borrowings from the government Member kb:BorrowingsFromTheGovernmentMember
2643 SEMAS and others Member kb:KoreaEnergyAgencyAndOthersMember
2644 Borrowings from banks Member kb:BorrowingsFromBankingInstitutionsInKoreanWonMember
2645 Industrial & Commercial Bank of China and others Member kb:IndustrialBankOfKoreaMember
2646 Borrowings from non banking financial institutions Member kb:BorrowingsFromNonBankingFinancialInstitutionsMember
2647 The Korea Development Bank and others Member kb:TheKoreaDevelopmentBankAndOthersMember
2648 Other borrowings Member kb:BorrowingsFromOtherInKoreanWonMember
2649 The Korea Development Bank and others Member kb:KoreaGasSafetyCorporationAndOthersMember
2650 Foreign Currencies Member [Member] Member kb:ForeignCurrenciesMember
2651 Borrowings From Due To Banks Member [Member] Member kb:BorrowingsFromDueToBanksMember
2652 Commerzbank AG and Others Member [Member] Member kb:JPMorganChaseBankAndOthersMember
2653 Borrowings From Banking Institutions In Foreign Currency Member [Member] Member kb:BorrowingsFromBankingInstitutionsInForeignCurrencyMember
2654 Central Bank of Uzbekistan and Others Member [Member] Member kb:MizuhoBankAndOthersMember
2655 Borrowings From Other Financial Institutions Member [Member] Member kb:BorrowingsFromOtherFinancialInstitutionsMember
2656 The Export Import Bank Of Korea And Others Member [Member] Member kb:TheExportImportBankOfKoreaAndOthersMember
2657 Borrowings From Other In Foreign Currencies Member [Member] Member kb:BorrowingsFromOtherInForeignCurrenciesMember
2658 Standard Chartered Bank And Others Member [Member] Member kb:StandardCharteredBankAndOthersMember
2659 Range Axis [Axis] Axis ifrs-full:RangeAxis
2660 Ranges Member [Domain] Member ifrs-full:RangesMember
2661 Bottom Of Range Member [Member] Member ifrs-full:BottomOfRangeMember
2662 Top Of Range Member [Member] Member ifrs-full:TopOfRangeMember
2663 Disclosure Of Detailed Information About Borrowings Line Items [Line Items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
2664 Borrowings Concept (Monetary) As Of Credit ifrs-full:Borrowings
2665 Annual interest rate Concept (Percent) As Of ifrs-full:BorrowingsInterestRate
2666 24210103 - Disclosure - Debts_The Details Of Repurchase Agreements And Others (Details) Network

*

*

 http://www.kbfg.com/role/DebtsTheDetailsOfRepurchaseAgreementsAndOthersDetails
2667 Disclosure Of Detailed Information About Repurchase Agreements And Others Table [Table] Table

*

*

 kb:DisclosureOfDetailedInformationAboutRepurchaseAgreementsAndOthersTable
2668 Borrowings By Name Axis [Axis] Axis ifrs-full:BorrowingsByNameAxis
2669 Lenders Member ifrs-full:BorrowingsByNameMember
2670 Repurchase agreements Member us-gaap:RepurchaseAgreementsMember
2671 Individuals, Groups and Corporations Member kb:IndividualsGroupsAndCorporationsMember
2672 Bills sold Member kb:BillsSoldMember
2673 Counter sale Member kb:CounterSaleMember
2674 Range Axis [Axis] Axis ifrs-full:RangeAxis
2675 Ranges Member [Domain] Member ifrs-full:RangesMember
2676 Bottom Of Range Member [Member] Member ifrs-full:BottomOfRangeMember
2677 Top Of Range Member [Member] Member ifrs-full:TopOfRangeMember
2678 Disclosure Of Detailed Information About Repurchase Agreements And Others Line Items [Line Items] LineItems kb:DisclosureOfDetailedInformationAboutRepurchaseAgreementsAndOthersLineItems
2679 Repurchase Agreements And Others Concept (Monetary) As Of Credit kb:RepurchaseAgreementsAndOthers
2680 Annual interest rate Concept (Percent) As Of kb:RepurchaseAgreementsAndOthersInterestRate
2681 24210104 - Disclosure - Debts_The Details Of Call Money (Details) Network

*

*

 http://www.kbfg.com/role/DebtsTheDetailsOfCallMoneyDetails
2682 Disclosure Of Detailed Information About Call Money Table [Table] Table

*

*

 kb:DisclosureOfDetailedInformationAboutCallMoneyTable
2683 Borrowings By Name Axis [Axis] Axis ifrs-full:BorrowingsByNameAxis
2684 Lenders Member ifrs-full:BorrowingsByNameMember
2685 Call money in Korean won Member kb:BorrowingsInKoreanWonMember
2686 Deutsche Bank AG, Seoul and others Member kb:KEBHanaBankAndOthersMember
2687 Call money in foreign currencies Member kb:BorrowingsInForeignCurrenciesMember
2688 Central bank Uzbekistan and others Member kb:CentralBankUzbekistanAndOthersMember
2689 Range Axis [Axis] Axis ifrs-full:RangeAxis
2690 Ranges Member [Domain] Member ifrs-full:RangesMember
2691 Bottom Of Range Member [Member] Member ifrs-full:BottomOfRangeMember
2692 Top Of Range Member [Member] Member ifrs-full:TopOfRangeMember
2693 Disclosure Of Detailed Information About Call Money Line Items [Line Items] LineItems kb:DisclosureOfDetailedInformationAboutCallMoneyLineItems
2694 Call Money Concept (Monetary) As Of Credit kb:CallMoney
2695 Annual interest rate Concept (Percent) For Period kb:CallMoneyInterestRate
2696 24220101 - Disclosure - Debentures_Details Of Debentures(Details) Network

*

*

 http://www.kbfg.com/role/DebenturesDetailsOfDebenturesDetails
2697 Disclosure Of Detailed Information About Debentures Table [Table] Table

*

*

 kb:DisclosureOfDetailedInformationAboutDebenturesTable
2698 Borrowings By Name Axis [Axis] Axis ifrs-full:BorrowingsByNameAxis
2699 Borrowings By Name Member [Domain] Member ifrs-full:BorrowingsByNameMember
2700 Debentures in Korean won Member kb:KoreanWonMember
2701 Korean Won Gross Carrying Amount Member [Member] Member kb:KoreanWonGrossCarryingAmountMember
2702 Structured debentures Member us-gaap:StructuredFinanceMember
2703 Subordinated fixed rate debentures in Korean won Member us-gaap:SubordinatedDebtMember
2704 Fixed rate debentures in Korean won Member kb:FixedRateInKoreanWonMember
2705 Floating rate debentures in Korean won Member kb:FloatingRateInKoreanWonMember
2706 Fair value adjustments on fair value hedged financial debentures in Korean won Member kb:FairValueHedgedItemsInKoreanWonMember
2707 Less Discount on debentures in Korean won Member kb:DiscountInKoreanWonMember
2708 Debentures in foreign currencies Member kb:ForeignCurrenciesMember
2709 Foreign Currencies Gross Carrying Amount Member [Member] Member kb:ForeignCurrenciesGrossCarryingAmountMember
2710 Floating rate debentures Member kb:FloatingRateInForeignCurrenciesMember
2711 Fixed rate debentures Member kb:FixedRateInForeignCurrenciesMember
2712 Fair value adjustments on fair value hedged debentures in foreign currencies Member kb:FairValueHedgedItemsInForeignCurrenciesMember
2713 Less Discount or premium on debentures in foreign currencies Member kb:DiscountInForeignCurrenciesMember
2714 Range Axis [Axis] Axis ifrs-full:RangeAxis
2715 Ranges Member [Domain] Member ifrs-full:RangesMember
2716 Bottom Of Range Member [Member] Member ifrs-full:BottomOfRangeMember
2717 Top Of Range Member [Member] Member ifrs-full:TopOfRangeMember
2718 Disclosure Of Detailed Information About Deventures Line Items [Line Items] LineItems kb:DisclosureOfDetailedInformationAboutDeventuresLineItems
2719 Debentures Concept (Monetary) As Of Credit ifrs-full:NotesAndDebenturesIssued
2720 Annual interest rate Concept (Percent) As Of kb:DeventuresInterestRate
2721 24220102 - Disclosure - Debentures_Changes In Debentures Based On Face Value(Details) Network

*

*

 http://www.kbfg.com/role/DebenturesChangesInDebenturesBasedOnFaceValueDetails
2722 Disclosure Of Changes In Debentures Based On Face Value Table [Table] Table

*

*

 kb:DisclosureOfChangesInDebenturesBasedOnFaceValueTable
2723 Borrowings By Name Axis [Axis] Axis ifrs-full:BorrowingsByNameAxis
2724 Borrowings By Name Member [Domain] Member ifrs-full:BorrowingsByNameMember
2725 Debentures in Korean won Member kb:KoreanWonMember
2726 Structured debentures Member us-gaap:StructuredFinanceMember
2727 Subordinated fixed rate debentures in Korean won Member us-gaap:SubordinatedDebtMember
2728 Fixed rate debentures in Korean won Member kb:FixedRateInKoreanWonMember
2729 Floating rate debentures in Korean won Member kb:FloatingRateInKoreanWonMember
2730 Debentures in foreign currencies Member kb:ForeignCurrenciesMember
2731 Floating rate debentures Member kb:FloatingRateInForeignCurrenciesMember
2732 Fixed rate debentures Member kb:FixedRateInForeignCurrenciesMember
2733 Disclosure Of Changes In Debentures Based On Face Value Line Items [Line Items] LineItems kb:DisclosureOfChangesInDebenturesBasedOnFaceValueLineItems
2734 Reconciliation Of Changes In Debentures Based On Face Value Abstract [Abstract] Abstract kb:ReconciliationOfChangesInDebenturesBasedOnFaceValueAbstract
2735 Beginning Concept (Monetary) As Of Credit kb:DebenturesOnFaceValue
2736 Changes In Debentures Based On Face Value Abstract [Abstract] Abstract kb:ChangesInDebenturesBasedOnFaceValueAbstract
2737 Issues Concept (Monetary) For Period Credit kb:IssuesOfDeventuresOnFaceValue
2738 Repayments Concept (Monetary) For Period Debit kb:RepaymentsOfDeventuresOnFaceValue
2739 Business combination Concept (Monetary) For Period Credit kb:IncreaseDecreaseFromBusinessCombinationOfDeventuresOnFaceValue
2740 Others Concept (Monetary) For Period Credit kb:IncreaseDecreaseFromOthersOfDeventuresOnFaceValue
2741 Ending Concept (Monetary) As Of Credit kb:DebenturesOnFaceValue
2742 24230101 - Disclosure - Provisions_Details Of Provisions(Details) Network

*

*

 http://www.kbfg.com/role/ProvisionsDetailsOfProvisionsDetails
2743 Disclosure Of Other Provisions Table [Table] Table

*

*

 ifrs-full:DisclosureOfOtherProvisionsTable
2744 Classes Of Provisions Axis [Axis] Axis ifrs-full:ClassesOfProvisionsAxis
2745 Other Provisions Member [Domain] Member ifrs-full:OtherProvisionsMember
2746 Provision For Commitments And Payment Guarantee Member [Member] Member kb:ProvisionForCommitmentsAndPaymentGuaranteeMember
2747 Provisions for unused loan commitments Member ifrs-full:ProvisionForCreditCommitmentsMember
2748 Provisions for payment guarantees Member us-gaap:PaymentGuaranteeMember
2749 Financial guarantee contrancts Member ifrs-full:FinancialGuaranteeContractsMember
2750 Provisions for restoration cost Member ifrs-full:ProvisionForDecommissioningRestorationAndRehabilitationCostsMember
2751 Others Member kb:ProvisionsMember
2752 Membership rewards program Member kb:MembershipRewardsProgramMember
2753 Dormant accounts Member kb:DormantAccountsMember
2754 Litigations Member ifrs-full:LegalProceedingsProvisionMember
2755 Ending(Debentures) Member kb:GreenhouseGasEmissionLiabilitiesMember
2756 Others Member ifrs-full:MiscellaneousOtherProvisionsMember
2757 Disclosure Of Other Provisions Line Items [Line Items] LineItems ifrs-full:DisclosureOfOtherProvisionsLineItems
2758 Provisions Concept (Monetary) As Of Credit ifrs-full:Provisions
2759 Reconciliation Of Changes In Other Provisions Abstract [Abstract] Abstract ifrs-full:ReconciliationOfChangesInOtherProvisionsAbstract
2760 Beginning Concept (Monetary) As Of Credit ifrs-full:Provisions
2761 Changes In Other Provisions Abstract [Abstract] Abstract ifrs-full:ChangesInOtherProvisionsAbstract
2762 Effects of changes in foreign exchange rate Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughNetExchangeDifferencesOtherProvisions
2763 Provision(reversal) Concept (Monetary) For Period Credit kb:IncreaseDecreaseInProvisionAndReversalOfFinancialGuaranteeContracts
2764 Business combination Concept (Monetary) For Period Credit ifrs-full:AcquisitionsThroughBusinessCombinationsOtherProvisions
2765 Provision Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseInExistingProvisionsOtherProvisions
2766 Reversal Concept (Monetary) For Period Debit ifrs-full:UnusedProvisionReversedOtherProvisions
2767 Used Concept (Monetary) For Period Debit ifrs-full:ProvisionUsedOtherProvisions
2768 Unwinding of discount Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughTimeValueOfMoneyAdjustmentOtherProvisions
2769 Effects of changes in discount rate Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughChangeInDiscountRateOtherProvisions
2770 Ending Concept (Monetary) As Of Credit ifrs-full:Provisions
2771 Estimated Quantity Of Greenhouse Gas Emission Concept (Decimal) As Of kb:EstimatedQuantityOfGreenhouseGasEmission
2772 Description Of Nature Of Provisions For Restoration Cost Concept (Text/String) For Period kb:DescriptionOfNatureOfProvisionsForRestorationCost
2773 24240101 - Disclosure - Net Defined Benefit Liabilities And Assets_Changes In The Net Defined Benefit Liabilities(Details) Network

*

*

 http://www.kbfg.com/role/NetDefinedBenefitLiabilitiesChangesInTheNetDefinedBenefitLiabilitiesDetails
2774 Disclosure Of Net Defined Benefit Liability Asset Table [Table] Table

*

*

 ifrs-full:DisclosureOfNetDefinedBenefitLiabilityAssetTable
2775 Net Defined Benefit Liability Asset Axis [Axis] Axis ifrs-full:NetDefinedBenefitLiabilityAssetAxis
2776 Net defined benefit liabilities Member ifrs-full:NetDefinedBenefitLiabilityAssetMember
2777 Present value of defined benefit obligation Member ifrs-full:PresentValueOfDefinedBenefitObligationMember
2778 Fair value of plan assets Member ifrs-full:PlanAssetsMember
2779 Disclosure Of Net Defined Benefit Liability Asset Line Items [Line Items] LineItems ifrs-full:DisclosureOfNetDefinedBenefitLiabilityAssetLineItems
2780 Beginning Concept (Monetary) As Of Credit kb:NetDefinedBenefitLiabilitiesCalculatedBySubtractingNetDefinedBenefitAssets
2781 Changes In Net Defined Benefit Liability Asset Abstract [Abstract] Abstract ifrs-full:ChangesInNetDefinedBenefitLiabilityAssetAbstract
2782 Current service cost Concept (Monetary) For Period Credit ifrs-full:CurrentServiceCostNetDefinedBenefitLiabilityAsset
2783 Interest cost (income) Concept (Monetary) For Period Credit ifrs-full:InterestExpenseIncomeNetDefinedBenefitLiabilityAsset
2784 Past service cost Concept (Monetary) For Period Credit ifrs-full:PastServiceCostNetDefinedBenefitLiabilityAsset
2785 Gain or loss on settlement Concept (Monetary) For Period Debit ifrs-full:GainsLossesArisingFromSettlementsNetDefinedBenefitLiabilityAsset
2786 Remeasurements Abstract ifrs-full:GainLossOnRemeasurementOfNetDefinedBenefitLiabilityAssetAbstract
2787 Actuarial gains and losses by changes in demographic assumptions Concept (Monetary) For Period Debit ifrs-full:ActuarialGainsLossesArisingFromChangesInDemographicAssumptionsNetDefinedBenefitLiabilityAsset
2788 Actuarial gains and losses by changes in financial assumptions Concept (Monetary) For Period Debit ifrs-full:ActuarialGainsLossesArisingFromChangesInFinancialAssumptionsNetDefinedBenefitLiabilityAsset
2789 Actuarial gains and losses by experience adjustments Concept (Monetary) For Period Debit ifrs-full:ActuarialGainsLossesArisingFromExperienceAdjustmentsNetDefinedBenefitLiabilityAsset
2790 Return on plan assets (excluding amounts included in interest income) Concept (Monetary) For Period Debit ifrs-full:ReturnOnPlanAssetsNetDefinedBenefitLiabilityAsset
2791 Contributions Abstract ifrs-full:ContributionsToPlanNetDefinedBenefitLiabilityAssetAbstract
2792 The Group Concept (Monetary) For Period Debit ifrs-full:ContributionsToPlanByEmployerNetDefinedBenefitLiabilityAsset
2793 Employees Concept (Monetary) For Period Debit ifrs-full:ContributionsToPlanByPlanParticipantsNetDefinedBenefitLiabilityAsset
2794 Payments from plans (benefit payments) Concept (Monetary) For Period Debit ifrs-full:PaymentsInRespectOfSettlementsNetDefinedBenefitLiabilityAsset
2795 Payments from the Group Concept (Monetary) For Period Debit ifrs-full:PaymentsFromPlanNetDefinedBenefitLiabilityAsset
2796 Transfer in Concept (Monetary) For Period Credit kb:TransferInRelatedPartyNetDefinedBenefitLiabilityAsset
2797 Transfer out Concept (Monetary) For Period Debit kb:TransferOutRelatedPartyNetDefinedBenefitLiabilityAsset
2798 Effect of exchange rate changes Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughChangesInForeignExchangeRatesNetDefinedBenefitLiabilityAsset
2799 Effect of business combination and disposal of business Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughBusinessCombinationsAndDisposalsNetDefinedBenefitLiabilityAsset
2800 Others Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughOtherChangesNetDefinedBenefitLiabilityAsset
2801 Ending Concept (Monetary) As Of Credit kb:NetDefinedBenefitLiabilitiesCalculatedBySubtractingNetDefinedBenefitAssets
2802 Description of type of plan Concept (Text/String) For Period ifrs-full:DescriptionOfTypeOfRetirementBenefitPlan
2803 Description of risks to which plan exposes entity Concept (Text/String) For Period ifrs-full:DescriptionOfRisksToWhichPlanExposesEntity
2804 Description of significant actuarial assumptions made and method used to calculate actuarial present value of promised retirement benefits Concept (Text/String) For Period ifrs-full:DescriptionOfSignificantActuarialAssumptionsMadeAndMethodUsedToCalculateActuarialPresentValueOfPromisedRetirementBenefits
2805 24240102 - Disclosure - Net Defined Benefit Liabilities And Assets_Details Of The Net Defined Benefit Liabilities(Details) Network

*

*

 http://www.kbfg.com/role/NetDefinedBenefitLiabilitiesDetailsOfTheNetDefinedBenefitLiabilitiesDetails
2806 Implied Table Table

*

*

 implied:Table
2807 Disclosure Of Defined Benefit Plans Abstract [Abstract] Abstract ifrs-full:DisclosureOfDefinedBenefitPlansAbstract
2808 Surplus Deficit In Plan Abstract [Abstract] Abstract ifrs-full:SurplusDeficitInPlanAbstract
2809 Present value of defined benefit obligation Concept (Monetary) As Of Credit ifrs-full:DefinedBenefitObligationAtPresentValue
2810 Plan Assets At Fair Value Concept (Monetary) As Of Debit ifrs-full:PlanAssetsAtFairValue
2811 Net defined benefit liabilities Concept (Monetary) As Of Credit kb:NetDefinedBenefitLiabilitiesCalculatedBySubtractingNetDefinedBenefitAssets
2812 24240103 - Disclosure - Net Defined Benefit Liabilities And Assets_Details Of Post-Employment Benefits Recognized In Profit Or Loss(Details) Network

*

*

 http://www.kbfg.com/role/NetDefinedBenefitLiabilitiesDetailsOfPostEmploymentBenefitsRecognizedInProfitOrLossDetails
2813 Implied Table Table

*

*

 implied:Table
2814 Details Of Postemployment Benefits Recognized In Profit Or Loss Abstract [Abstract] Abstract kb:DetailsOfPostemploymentBenefitsRecognizedInProfitOrLossAbstract
2815 Current service cost Concept (Monetary) For Period Credit ifrs-full:CurrentServiceCostNetDefinedBenefitLiabilityAsset
2816 Past service cost Concept (Monetary) For Period Credit ifrs-full:PastServiceCostNetDefinedBenefitLiabilityAsset
2817 Net interest expenses of net defined benefit liabilities Concept (Monetary) For Period Credit ifrs-full:InterestExpenseIncomeNetDefinedBenefitLiabilityAsset
2818 Gain or loss on settlement Concept (Monetary) For Period Debit ifrs-full:GainsLossesArisingFromSettlementsNetDefinedBenefitLiabilityAsset
2819 Post-employment benefits Concept (Monetary) For Period Debit ifrs-full:PostemploymentBenefitExpenseDefinedBenefitPlans
2820 Postemployment Benefit Expense Defined Benefit Plans Recognized As Other Operating Income Expense Concept (Monetary) For Period Credit kb:PostemploymentBenefitExpenseDefinedBenefitPlansRecognizedAsOtherOperatingIncomeExpense
2821 Postemployment Benefit Expense Defined Benefit Plans Recognized As Advance Payments Concept (Monetary) As Of Debit kb:PostemploymentBenefitExpenseDefinedBenefitPlansRecognizedAsAdvancePayments
2822 24240104 - Disclosure - Net Defined Benefit Liabilities And Assets_Remeasurements Of The Net Defined Benefit Liabilities Recognized As Other Comprehensive Income(Details) Network

*

*

 http://www.kbfg.com/role/NetDefinedBenefitLiabilitiesRemeasurementsOfTheNetDefinedBenefitLiabilitiesRecognizedAsOtherComprehensiveIncomeDetails
2823 Implied Table Table

*

*

 implied:Table
2824 Remeasurement Of Net Defined Benefit Liability Asset Recognized As Other Comprehensive Income Abstract [Abstract] Abstract kb:RemeasurementOfNetDefinedBenefitLiabilityAssetRecognizedAsOtherComprehensiveIncomeAbstract
2825 Return On Plan Assets Net Defined Benefit Liability Asset Concept (Monetary) For Period Debit ifrs-full:ReturnOnPlanAssetsNetDefinedBenefitLiabilityAsset
2826 Actuarial Gain Loss On Remeasurement Of Defined Benefit Liability Concept (Monetary) For Period Debit kb:ActuarialGainLossOnRemeasurementOfDefinedBenefitLiability
2827 Income Tax Effect Of Remeasurements Of Defined Benefit Plans Of Other Comprehensive Income Concept (Monetary) For Period Debit kb:IncomeTaxEffectOfRemeasurementsOfDefinedBenefitPlansOfOtherComprehensiveIncome
2828 Remeasurements after income tax Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans
2829 24240105 - Disclosure - Net Defined Benefit Liabilities And Assets_The Details Of Fair Value Of Plan Assets(Details) Network

*

*

 http://www.kbfg.com/role/NetDefinedBenefitLiabilitiesTheDetailsOfFairValueOfPlanAssetsDetails
2830 Disclosure Of Fair Value Of Plan Assets Table [Table] Table

*

*

 ifrs-full:DisclosureOfFairValueOfPlanAssetsTable
2831 Levels Of Fair Value Hierarchy Axis [Axis] Axis ifrs-full:LevelsOfFairValueHierarchyAxis
2832 All Levels Of Fair Value Hierarchy Member [Domain] Member ifrs-full:AllLevelsOfFairValueHierarchyMember
2833 Assets quoted in an active market Member ifrs-full:Level1OfFairValueHierarchyMember
2834 Assets not quoted in an active market Member ifrs-full:Level2And3OfFairValueHierarchyMember
2835 Disclosure Of Fair Value Of Plan Assets Line Items [Line Items] LineItems ifrs-full:DisclosureOfFairValueOfPlanAssetsLineItems
2836 Details Of Fair Value Of Plan Assests Abstract [Abstract] Abstract kb:DetailsOfFairValueOfPlanAssestsAbstract
2837 Cash and due from financial institutions Concept (Monetary) As Of Debit kb:CashAndDueFromFinancialInstitutionsAmountContributedToFairValueOfPlanAssets
2838 Investment fund Concept (Monetary) As Of Debit ifrs-full:InvestmentFundsAmountContributedToFairValueOfPlanAssets
2839 Total Concept (Monetary) As Of Debit ifrs-full:PlanAssetsAtFairValue
2840 24240106 - Disclosure - Net Defined Benefit Liabilities And Assets_Key Actuarial Assumptions (Details) Network

*

*

 http://www.kbfg.com/role/NetDefinedBenefitLiabilitiesKeyActuarialAssumptionsDetails
2841 Disclosure Of Actuarial Assumptions Table [Table] Table

*

*

 kb:DisclosureOfActuarialAssumptionsTable
2842 Range Axis [Axis] Axis ifrs-full:RangeAxis
2843 Ranges Member [Domain] Member ifrs-full:RangesMember
2844 Bottom Of Range Member [Member] Member ifrs-full:BottomOfRangeMember
2845 Top Of Range Member [Member] Member ifrs-full:TopOfRangeMember
2846 Disclosure Of Actuarial Assumptions Line Items [Line Items] LineItems kb:DisclosureOfActuarialAssumptionsLineItems
2847 Discount rate Concept (Percent) As Of ifrs-full:ActuarialAssumptionOfDiscountRates
2848 Salary increase rate Concept (Percent) As Of ifrs-full:ActuarialAssumptionOfExpectedRatesOfSalaryIncreases
2849 Turnover Concept (Percent) As Of ifrs-full:OtherMaterialActuarialAssumptions
2850 Description Of Actuarial Assumption Of Mortality Rates Concept (Text/String) For Period kb:DescriptionOfActuarialAssumptionOfMortalityRates
2851 24240107 - Disclosure - Net Defined Benefit Liabilities And Assets_The Sensitivity Of The Defined Benefit Obligation To Changes In The Weighted Principal Assumptions(Details) Network

*

*

 http://www.kbfg.com/role/NetDefinedBenefitLiabilitiesTheSensitivityOfTheDefinedBenefitObligationToChangesInTheWeightedPrincipalAssumptionsDetails
2852 Disclosure Of Sensitivity Analysis For Actuarial Assumptions Table [Table] Table

*

*

 ifrs-full:DisclosureOfSensitivityAnalysisForActuarialAssumptionsTable
2853 Actuarial Assumptions Axis [Axis] Axis ifrs-full:ActuarialAssumptionsAxis
2854 Actuarial Assumptions Member [Domain] Member ifrs-full:ActuarialAssumptionsMember
2855 Discount rate Member ifrs-full:ActuarialAssumptionOfDiscountRatesMember
2856 Salary increase rate Member ifrs-full:ActuarialAssumptionOfExpectedRatesOfSalaryIncreasesMember
2857 Turnover Member ifrs-full:OtherMaterialActuarialAssumptionsMember
2858 Range Axis [Axis] Axis ifrs-full:RangeAxis
2859 Ranges Member [Domain] Member ifrs-full:RangesMember
2860 Weighted Average Member [Member] Member ifrs-full:WeightedAverageMember
2861 Disclosure Of Sensitivity Analysis For Actuarial Assumptions Line Items [Line Items] LineItems ifrs-full:DisclosureOfSensitivityAnalysisForActuarialAssumptionsLineItems
2862 Changes In Principal Assumption Concept (Percent) For Period kb:ChangesInPrincipalAssumption
2863 Effect on net defined benefit obligation Abstract kb:DetailsOfEffectOnNetDefinedBenefitLiabilityAbstract
2864 Increase in principal assumption Concept (Percent) As Of ifrs-full:PercentageOfReasonablyPossibleIncreaseInActuarialAssumption
2865 Decrease in principal assumption Concept (Percent) As Of ifrs-full:PercentageOfReasonablyPossibleDecreaseInActuarialAssumption
2866 Description Of Methods And Assumptions Used In Preparing Sensitivity Analysis For Actuarial Assumptions Concept (Text/String) For Period ifrs-full:DescriptionOfMethodsAndAssumptionsUsedInPreparingSensitivityAnalysisForActuarialAssumptions
2867 24240108 - Disclosure - Net Defined Benefit Liabilities And Assets_Expected Maturity Analysis Of Undiscounted Pension Benefits Including Expected Future Benefit(Details) Network

*

*

 http://www.kbfg.com/role/NetDefinedBenefitLiabilitiesExpectedMaturityAnalysisOfUndiscountedPensionBenefitsIncludingExpectedFutureBenefitDetails
2868 Disclosure Of Expected Maturity Analysis Table [Table] Table

*

*

 kb:DisclosureOfExpectedMaturityAnalysisTable
2869 Maturity Axis [Axis] Axis ifrs-full:MaturityAxis
2870 Aggregated Time Bands Member [Domain] Member ifrs-full:AggregatedTimeBandsMember
2871 Up to 1 year Member ifrs-full:LaterThanSixMonthsAndNotLaterThanOneYearMember
2872 1~2 years Member ifrs-full:LaterThanOneYearAndNotLaterThanTwoYearsMember
2873 2~5 years Member ifrs-full:LaterThanTwoYearsAndNotLaterThanFiveYearsMember
2874 5~10 years Member ifrs-full:LaterThanFiveYearsAndNotLaterThanTenYearsMember
2875 Over 10 years Member ifrs-full:LaterThanSevenYearsAndNotLaterThanTenYearsMember
2876 Disclosure Of Expected Maturity Analysis Line Items [Line Items] LineItems kb:DisclosureOfExpectedMaturityAnalysisLineItems
2877 Pension benefits Concept (Monetary) As Of Credit kb:UndiscountedPensionBenefitsIncludingExpectedFutureBenefits
2878 Description of undiscounted pension benefits including expected future benefits Concept (Text/String) For Period kb:DescriptionOfUndiscountedPensionBenefitsIncludingExpectedFutureBenefits
2879 24240108 - Disclosure - Net Defined Benefit Liabilities And Assets_Expected Maturity Analysis Of Undiscounted Pension Benefits Including Expected Future Benefit(Details) Network

*

*

 http://www.kbfg.com/role/NetDefinedBenefitLiabilitiesExpectedMaturityAnalysisOfUndiscountedPensionBenefitsIncludingExpectedFutureBenefitDetails
2880 Disclosure Of Weighted Average Duration Of Defined Benefit Obligation Table [Table] Table

*

*

 kb:DisclosureOfWeightedAverageDurationOfDefinedBenefitObligationTable
2881 Range Axis [Axis] Axis ifrs-full:RangeAxis
2882 Ranges Member [Domain] Member ifrs-full:RangesMember
2883 Bottom Of Range Member [Member] Member ifrs-full:BottomOfRangeMember
2884 Top Of Range Member [Member] Member ifrs-full:TopOfRangeMember
2885 Disclosure Of Weighted Average Duration Of Defined Benefit Obligation Line Items [Line Items] LineItems kb:DisclosureOfWeightedAverageDurationOfDefinedBenefitObligationLineItems
2886 Weighted Average Duration Of Defined Benefit Obligation Concept (Decimal) For Period ifrs-full:WeightedAverageDurationOfDefinedBenefitObligation
2887 24240108 - Disclosure - Net Defined Benefit Liabilities And Assets_Expected Maturity Analysis Of Undiscounted Pension Benefits Including Expected Future Benefit(Details) Network

*

*

 http://www.kbfg.com/role/NetDefinedBenefitLiabilitiesExpectedMaturityAnalysisOfUndiscountedPensionBenefitsIncludingExpectedFutureBenefitDetails
2888 Implied Table Table

*

*

 implied:Table
2889 Expected Maturity Analysis Of Undiscounted Pension Benefits Abstract [Abstract] Abstract kb:ExpectedMaturityAnalysisOfUndiscountedPensionBenefitsAbstract
2890 Disclosure Of Weighted Average Duration Of Defined Benefit Obligation Abstract [Abstract] Abstract kb:DisclosureOfWeightedAverageDurationOfDefinedBenefitObligationAbstract
2891 Estimate Of Contributions Expected To Be Paid To Plan Abstract [Abstract] Abstract kb:EstimateOfContributionsExpectedToBePaidToPlanAbstract
2892 Estimate Of Contributions Expected To Be Paid To Plan Concept (Monetary) For Period Credit ifrs-full:EstimateOfContributionsExpectedToBePaidToPlan
2893 24250101 - Disclosure - Other Liabilities_Details Of Other Liabilities(Details) Network

*

*

 http://www.kbfg.com/role/OtherLiabilitiesDetailsOfOtherLiabilitiesDetails
2894 Other Liabilities Table [Table] Table

*

*

 kb:OtherLiabilitiesTable
2895 Classes Of Liabilities Axis [Axis] Axis ifrs-full:ClassesOfLiabilitiesAxis
2896 Liabilities Member [Domain] Member ifrs-full:LiabilitiesMember
2897 Other financial liabilities Member kb:OtherFinancialLiabilitiesMember
2898 Other payables Member kb:OtherPayablesMember
2899 Prepaid card and debit card Member kb:PrepaidCardAndDebitCardMember
2900 Accrued expenses Member kb:AccruedExpensesMember
2901 Financial guarantee contrancts Member ifrs-full:FinancialGuaranteeContractsMember
2902 Deposits for letter of guarantees and others Member kb:DepositsForLetterOfGuaranteesAndOthersMember
2903 Domestic exchange settlement credits Member us-gaap:DomesticLineOfCreditMember
2904 Foreign exchanges settlement credits Member us-gaap:ForeignLineOfCreditMember
2905 Borrowings from other business accounts Member kb:BorrowingsFromOtherBusinessAccountsMember
2906 Other payables from trust accounts Member kb:TrustAccountsMember
2907 Liability incurred from agency relationships Member kb:AgencyRelationshipsMember
2908 Account for agency businesses Member kb:AgencyBusinessesMember
2909 Dividend payables Member us-gaap:DividendPaidMember
2910 Other payables from factored receivables Member ifrs-full:FactoringOfReceivablesMember
2911 Others Member kb:MiscellaneousFinancialLiabilitiesMember
2912 Other non-financial liabilities Member kb:OtherNonFinancialLiabilitiesMember
2913 Other payables Member kb:OtherPayablesNonFinancialMember
2914 Unearned revenue Member kb:UnearnedRevenueMember
2915 Accrued expenses Member kb:AccruedExpensesNonFinancialMember
2916 Deferred revenue on credit card points Member kb:DeferredRevenueMember
2917 Withholding taxes Member kb:WithholdingTaxesMember
2918 Insurance liabilities Member kb:InsuranceContractsLiabilitiesMember
2919 Separate account liabilities Member kb:SeperateAccountMember
2920 Others Member kb:MiscellaneousNonFinancialLiabilitiesMember
2921 Other Liabilities Line Items [Line Items] LineItems kb:OtherLiabilitiesLineItem
2922 Other Liabilities Concept (Monetary) As Of Credit ifrs-full:OtherLiabilities
2923 24260101 - Disclosure - Equity_Share Capital(Details) Network

*

*

 http://www.kbfg.com/role/EquityShareCapitalDetails
2924 Disclosure Of Classes Of Share Capital Table [Table] Table

*

*

 ifrs-full:DisclosureOfClassesOfShareCapitalTable
2925 Classes Of Share Capital Axis [Axis] Axis ifrs-full:ClassesOfShareCapitalAxis
2926 Classes Of Share Capital Member [Domain] Member ifrs-full:ClassesOfShareCapitalMember
2927 Ordinary shares Member ifrs-full:OrdinarySharesMember
2928 Type of share LineItems ifrs-full:DisclosureOfClassesOfShareCapitalLineItems
2929 Number of authorized shares Concept (Shares) As Of ifrs-full:NumberOfSharesAuthorised
2930 Par value per share Concept (Share) As Of ifrs-full:ParValuePerShare
2931 Number of issued shares Concept (Shares) As Of ifrs-full:NumberOfSharesIssuedAndFullyPaid
2932 Share Capital Concept (Monetary) As Of Credit ifrs-full:IssuedCapital
2933 Reconciliation Of Number Of Shares Outstanding Abstract [Abstract] Abstract ifrs-full:ReconciliationOfNumberOfSharesOutstandingAbstract
2934 Beginning Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
2935 Changes In Number Of Shares Outstanding Abstract [Abstract] Abstract ifrs-full:ChangesInNumberOfSharesOutstandingAbstract
2936 Increase Concept (Shares) For Period kb:IncreaseInNumberOfSharesOutstanding
2937 Decrease Concept (Shares) For Period us-gaap:TreasuryStockSharesAcquired
2938 Ending Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
2939 24260201 - Disclosure - Equity_Capital Surplus(Details) Network

*

*

 http://www.kbfg.com/role/EquityCapitalSurplusDetails
2940 Implied Table Table

*

*

 implied:Table
2941 Miscellaneous Equity Abstract [Abstract] Abstract ifrs-full:MiscellaneousEquityAbstract
2942 Share premium Concept (Monetary) As Of Credit ifrs-full:SharePremium
2943 Loss On Sales Of Treasury Shares Concept (Monetary) As Of Debit kb:LossOnSalesOfTreasuryShares
2944 Other capital surplus Concept (Monetary) As Of Credit us-gaap:OtherAdditionalCapital
2945 Total Concept (Monetary) As Of Credit ifrs-full:CapitalReserve
2946 24260301 - Disclosure - Equity_Accumulated Other Comprehensive Income (Details) Network

*

*

 http://www.kbfg.com/role/EquityAccumulatedOtherComprehensiveIncomeDetails
2947 Implied Table Table

*

*

 implied:Table
2948 Other Reserves Abstract [Abstract] Abstract ifrs-full:OtherReservesAbstract
2949 Remeasurements of net defined benefit liabilities Concept (Monetary) As Of Credit ifrs-full:ReserveOfRemeasurementsOfDefinedBenefitPlans
2950 Exchange differences on translating foreign operations Concept (Monetary) As Of Credit ifrs-full:ReserveOfExchangeDifferencesOnTranslation
2951 Change in value of available-for-sale financial assets Concept (Monetary) As Of Credit ifrs-full:ReserveOfGainsAndLossesOnRemeasuringAvailableforsaleFinancialAssets
2952 Change in value of held-to-maturity financial assets Concept (Monetary) As Of Credit kb:AccumulatedOtherComprehensiveIncomeAndLossOnHeldToMaturityFinancialAssets
2953 Shares of other comprehensive income of associates and joint ventures Concept (Monetary) As Of Credit kb:AccoumulatedSharesOfOtherComprehensiveIncomeOfAssociates
2954 Cash flow hedges Concept (Monetary) As Of Credit ifrs-full:ReserveOfCashFlowHedges
2955 Hedges of net investments in foreign operations Concept (Monetary) As Of Credit kb:AccoumulatedOtherComprehensiveIncomeHedgesOfNetInvestmentsInForeignOperations
2956 Other comprehensive income of separate account Concept (Monetary) As Of Credit kb:AccoumulatedOtherComprehensiveIncomeOfSeparateAccount
2957 Total Concept (Monetary) As Of Credit ifrs-full:AccumulatedOtherComprehensiveIncome
2958 24260401 - Disclosure - Equity_Retained Earnings (Details) Network

*

*

 http://www.kbfg.com/role/EquityRetainedEarningsDetails
2959 Implied Table Table

*

*

 implied:Table
2960 Retained Earnings Accumulated Deficit Abstract [Abstract] Abstract us-gaap:RetainedEarningsAccumulatedDeficitAbstract
2961 Legal reserves Concept (Monetary) As Of Credit ifrs-full:StatutoryReserve
2962 Voluntary reserves Concept (Monetary) As Of Credit kb:VoluntaryReserve
2963 Unappropriated retained earnings Concept (Monetary) As Of Credit us-gaap:RetainedEarningsUnappropriated
2964 Total Concept (Monetary) As Of Credit ifrs-full:RetainedEarnings
2965 Retained Earnings Restricted For Dividend At Subsidiaries Level Pursuant To Law And Regulations Concept (Monetary) As Of Credit kb:RetainedEarningsRestrictedForDividendAtSubsidiariesLevelPursuantToLawAndRegulations
2966 Description Of Nature And Purpose Of Legal Reserves Within Equity Concept (Text/String) For Period kb:DescriptionOfNatureAndPurposeOfLegalReservesWithinEquity
2967 24260501 - Disclosure - Equity_Treasury Shares (Details) Network

*

*

 http://www.kbfg.com/role/EquityTreasurySharesDetails
2968 Disclosure Of Treasury Shares Table [Table] Table

*

*

 kb:DisclosureOfTreasurySharesTable
2969 Classes Of Share Capital Axis [Axis] Axis ifrs-full:ClassesOfShareCapitalAxis
2970 Classes Of Share Capital Member [Domain] Member ifrs-full:ClassesOfShareCapitalMember
2971 Treasury Shares Member [Member] Member ifrs-full:TreasurySharesMember
2972 Disclosure Of Treasury Shares Line Items [Line Items] LineItems kb:DisclosureOfTreasurySharesLineItems
2973 Number of treasury shares Abstract us-gaap:StockTransactionsParentheticalDisclosuresAbstract
2974 Beginning Concept (Shares) As Of us-gaap:TreasuryStockShares
2975 Changes In Treasury Share Number Abstract [Abstract] Abstract kb:ChangesInTreasuryShareNumberAbstract
2976 Acquisition Concept (Shares) For Period us-gaap:TreasuryStockSharesAcquired
2977 Treasury Stock Shares Retired Concept (Shares) For Period us-gaap:TreasuryStockSharesRetired
2978 Ending Concept (Shares) As Of us-gaap:TreasuryStockShares
2979 Carrying amount Abstract kb:TreasuryStockTransactionsAmountExcludingValueOfSharesReissuedAbstract
2980 Beginning Concept (Monetary) As Of Debit ifrs-full:TreasuryShares
2981 Changes In Treasury Share Amount Abstract [Abstract] Abstract kb:ChangesInTreasuryShareAmountAbstract
2982 Acquisition Concept (Monetary) For Period Debit ifrs-full:PurchaseOfTreasuryShares
2983 Disposal Concept (Monetary) For Period Credit ifrs-full:SaleOrIssueOfTreasuryShares
2984 Ending Concept (Monetary) As Of Debit ifrs-full:TreasuryShares
2985 Trust Agreement To Acquire Treasury Shares Amount Concept (Monetary) As Of Credit kb:TrustAgreementToAcquireTreasurySharesAmount
2986 Termination of trust agreement to acquire treasury shares amount Concept (Monetary) As Of Debit kb:TerminationOfTrustAgreementToAcquireTreasurySharesAmount
2987 24270101 - Disclosure - Net Interest Income-Details Of Interest Income And Interest Expense(Details) Network

*

*

 http://www.kbfg.com/role/NetInterestIncomeInterestIncomeRecognizedOnImpairedLoanDetails
2988 Implied Table Table

*

*

 implied:Table
2989 Interest Revenue Or Expense Net Abstract [Abstract] Abstract us-gaap:InterestRevenueOrExpenseNetAbstract
2990 Interest income Abstract us-gaap:InterestAndDividendIncomeOperatingAbstract
2991 Due from financial institutions Concept (Monetary) For Period Credit us-gaap:InterestIncomeDepositsWithFinancialInstitutions
2992 Loans Concept (Monetary) For Period Credit ifrs-full:InterestIncomeOnLoansAndReceivables
2993 Financial investments Abstract kb:InterestIncomeOnFinancialInvestmentsAbstract
2994 Available-for-sale financial assets Concept (Monetary) For Period Credit ifrs-full:InterestIncomeOnAvailableforsaleFinancialAssets
2995 Held-to-maturity financial assets Concept (Monetary) For Period Credit ifrs-full:InterestIncomeOnHeldtomaturityInvestments
2996 Other Concept (Monetary) For Period Credit ifrs-full:InterestIncomeOnOtherFinancialAssets
2997 Sub-total Concept (Monetary) For Period Credit ifrs-full:RevenueFromInterest
2998 Interest expenses Abstract us-gaap:InterestExpenseAbstract
2999 Deposits Concept (Monetary) For Period Debit ifrs-full:InterestExpenseOnDepositsFromCustomers
3000 Debts Concept (Monetary) For Period Debit kb:InterestExpenseOnDebts
3001 Debentures Concept (Monetary) For Period Debit ifrs-full:InterestExpenseOnBonds
3002 Other Concept (Monetary) For Period Debit ifrs-full:InterestExpenseOnOtherFinancialLiabilities
3003 Sub-total Concept (Monetary) For Period Debit ifrs-full:InterestExpense
3004 Net interest income Concept (Monetary) For Period Credit ifrs-full:InterestRevenueExpense
3005 24270102 - Disclosure - Net Interest Income_Details Of Interest Income And Interest Expense(Details) Network

*

*

 http://www.kbfg.com/role/NetInterestIncomeDetailsOfInterestIncomeAndInterestExpenseDetails
3006 Interest Income On Impaired Financial Assets Accrued Table [Table] Table

*

*

 kb:InterestIncomeOnImpairedFinancialAssetsAccruedTable
3007 Classes Of Assets Axis [Axis] Axis ifrs-full:ClassesOfAssetsAxis
3008 Classes Of Assets Member [Domain] Member ifrs-full:ClassesOfAssetsMember
3009 Loans And Receivables Category Member [Member] Member ifrs-full:LoansAndReceivablesCategoryMember
3010 Financial Investment Member [Member] Member kb:FinancialInvestmentMember
3011 Disclosure Of Financial Instruments Line Items [Line Items] LineItems ifrs-full:DisclosureOfFinancialInstrumentsLineItems
3012 Interest Income On Impaired Financial Assets Accrued Concept (Monetary) For Period Credit ifrs-full:InterestIncomeOnImpairedFinancialAssetsAccrued
3013 24280101 - Disclosure - Net Fee and Commission Income_Details Of Fee And Commission Income And Fee And Commission Expense(Details) Network

*

*

 http://www.kbfg.com/role/NetFeeAndCommissionIncomeDetailsOfFeeAndCommissionIncomeAndFeeAndCommissionExpenseDetails
3014 Implied Table Table

*

*

 implied:Table
3015 Fee And Commission Income Expense Abstract [Abstract] Abstract ifrs-full:FeeAndCommissionIncomeExpenseAbstract
3016 Fee and commission income Abstract ifrs-full:FeeAndCommissionIncomeAbstract
3017 Banking activity fees Concept (Monetary) For Period Credit us-gaap:ServicingFeesNet
3018 Lending activity fees Concept (Monetary) For Period Credit us-gaap:FeesAndCommissionsMortgageBanking
3019 Credit card related fees and commissions Concept (Monetary) For Period Credit us-gaap:FeesAndCommissionsCreditCards
3020 Debit card related fees and commissions Concept (Monetary) For Period Credit us-gaap:FeesAndCommissionsDebitCards
3021 Agent activity fees Concept (Monetary) For Period Credit kb:AgentActivityFeesIncome
3022 Trust and other fiduciary fees Concept (Monetary) For Period Credit us-gaap:FeesAndCommissionsFiduciaryAndTrustActivities
3023 Fund management related fees Concept (Monetary) For Period Credit us-gaap:AssetManagementFees1
3024 Guarantee fees Concept (Monetary) For Period Credit us-gaap:GuarantyFeeIncome
3025 Foreign currency related fees Concept (Monetary) For Period Credit kb:ForeignCurrencyRelatedFeeIncome
3026 Commissions from transfer agent services Concept (Monetary) For Period Credit us-gaap:FeesAndCommissionsTransferAgent
3027 Other business account commission on consignment Concept (Monetary) For Period Credit us-gaap:FeesAndCommissionsCorrespondentClearing
3028 Commissions received on securities business Concept (Monetary) For Period Credit us-gaap:BrokerageCommissionsRevenue
3029 Lease fees Concept (Monetary) For Period Credit kb:LeaseFeesIncome
3030 Others Concept (Monetary) For Period Credit us-gaap:FeesAndCommissionsOther
3031 Sub-total Concept (Monetary) For Period Credit ifrs-full:FeeAndCommissionIncome
3032 Fee and commission expense Abstract ifrs-full:FeeAndCommissionExpenseAbstract
3033 Trading activity related fees Concept (Monetary) For Period Debit us-gaap:FloorBrokerageExchangeAndClearanceFees
3034 Lending activity fees Concept (Monetary) For Period Debit kb:LendingActivityFeesExpense
3035 Credit card related fees and commissions Concept (Monetary) For Period Debit kb:FeesAndCommissionsExpenseCreditCards
3036 Outsourcing related fees Concept (Monetary) For Period Debit kb:OutsourcingRelatedFeesExpense
3037 Foreign currency related fees Concept (Monetary) For Period Debit kb:ForeignCurrencyRelatedFeeExpense
3038 Management fees of written-off loans Concept (Monetary) For Period Debit kb:ManagementFeesOfWrittOffsLoans
3039 Other Concept (Monetary) For Period Debit ifrs-full:OtherFeeAndCommissionExpense
3040 Sub-total Concept (Monetary) For Period Debit ifrs-full:FeeAndCommissionExpense
3041 Net fee and commission income Concept (Monetary) For Period Credit ifrs-full:FeeAndCommissionIncomeExpense
3042 24290101 - Disclosure - Net Gains or Losses on Financial Assets_Liabilities at Fair Value Through Profit or Loss_Net Gains Or Losses On Financial Instruments Held For Tradings (Details) Network

*

*

 http://www.kbfg.com/role/NetGainsOrLossesOnFinancialAssetsLiabilitiesAtFairValueThroughProfitOrLossNetGainsOrLossesOnFinancialInstrumentsHeldForTradingDetailss
3043 Schedule Of Gain Loss On Investments Table [Table] Table

*

*

 us-gaap:ScheduleOfGainLossOnInvestmentsTable
3044 Gain Loss On Investments By Category Axis [Axis] Axis us-gaap:GainLossOnInvestmentsByCategoryAxis
3045 Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Categories Of Investments Domain[Domain] Member us-gaap:GainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostCategoriesOfInvestmentsDomain
3046 Gains related to financial instruments held for trading Member kb:GainOnFinancialInstrumentsHeldForTradingMember
3047 Losses related to financial instruments held for trading Member kb:LossOnFinancialInstrumentsHeldForTradingMember
3048 Assets And Liabilities Axis [Axis] Axis ifrs-full:AssetsAndLiabilitiesAxis
3049 Assets And Liabilities Member [Domain] Member ifrs-full:AssetsAndLiabilitiesMember
3050 Financial assets held for trading Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTradingCategoryMember
3051 Debt securities Member ifrs-full:DebtSecuritiesMember
3052 Equity securities Member ifrs-full:TradingEquitySecuritiesMember
3053 Derivatives held for trading Member ifrs-full:DerivativesMember
3054 Interest rate Member ifrs-full:InterestRateSwapContractMember
3055 Currency Member ifrs-full:CurrencySwapContractMember
3056 Stock or stock index Member kb:StockAndStockIndexMember
3057 Credit Member us-gaap:CreditMember
3058 Commodity Member us-gaap:CommodityMember
3059 Other Member us-gaap:OtherTradingMember
3060 Financial liabilties held for trading Member ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossThatMeetDefinitionOfHeldForTradingCategoryMember
3061 Other financial instruments Member kb:OtherFinancialInstrumentsHeldForTradingMember
3062 Gains Losses On Financial Instruments Held For Trading Line Items [Line Items] LineItems kb:GainsLossesOnFinancialInstrumentsHeldForTradingLineItem
3063 Gains Related To Financial Instrument Sheld For Trading Concept (Monetary) For Period Credit kb:Gainsrelatedtofinancialinstrumentsheldfortrading
3064 Losses Related To Financial Instrument Sheld For Trading Concept (Monetary) For Period Debit kb:Lossesrelatedtofinancialinstrumentsheldfortrading
3065 Net Gains Or Losses On Financial Instrument Sheld For Trading Concept (Monetary) For Period Credit kb:Netgainsorlossesonfinancialinstrumentsheldfortrading
3066 Description Of Nature Of Gains Losses On Financial Instruments Held For Trading Concept (Text/String) For Period kb:DescriptionOfNatureOfGainsLossesOnFinancialInstrumentsHeldForTrading
3067 24290102 - Disclosure - Net Gains or Losses on Financial Assets_Liabilities at Fair Value Through Profit or Loss_Net Gains Or Losses On Financial Instruments Designated At Fair Value Through Profit Or Loss (Details) Network

*

*

 http://www.kbfg.com/role/NetGainsOrLossesOnFinancialAssetsLiabilitiesAtFairValueThroughProfitOrLossNetgainsorlossesonfinancialinstrumentsdesignatedatfairvaluethroughprofitorlossDetails
3068 Schedule Of Gain Loss On Investments Table [Table] Table

*

*

 us-gaap:ScheduleOfGainLossOnInvestmentsTable
3069 Gain Loss On Finacial Instruments At Fair Value Through Profit Loss Axis [Axis] Axis kb:GainLossOnFinacialInstrumentsAtFairValueThroughProfitLossAxis
3070 Gains Losses On Financial Instruments At Fair Value Through Profit Or Loss Designated Upon Initial Recognition Member [Domain] Member kb:GainsLossesOnFinancialInstrumentsAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionMember
3071 Gains related to financial instruments designated at fair value therough profit or loss Member kb:GainOnFinancialInstrumentsAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionMember
3072 Losses related to financial instrumnets designated at fair value through profit or loss Member kb:LossOnFinancialInstrumentsAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionMember
3073 Assets And Liabilities Axis [Axis] Axis ifrs-full:AssetsAndLiabilitiesAxis
3074 Assets And Liabilities Member [Domain] Member ifrs-full:AssetsAndLiabilitiesMember
3075 Financial assets designated at fair value through profit and loss Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember
3076 Financial liabilities designated at fair value through profit or loss Member ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember
3077 Gains Losses On Financial Instruments At Fair Value Through Profit Or Loss Designated Upon Initial Recognition Line Items [Line Items] LineItems kb:GainsLossesOnFinancialInstrumentsAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionLineItems
3078 Gains Related To Financial Instruments Designated At Fair Value Through Profit Or Loss Concept (Monetary) For Period Credit kb:Gainsrelatedtofinancialinstrumentsdesignatedatfairvaluethroughprofitorloss
3079 Losses Related To Financial Instruments Designated At Fair Value Through Profit Or Loss Concept (Monetary) For Period Debit kb:Lossesrelatedtofinancialinstrumentsdesignatedatfairvaluethroughprofitorloss
3080 Net Gains Or Losses On Financial Instruments Designated At Fair Value Through Profit Or Loss Concept (Monetary) For Period Credit kb:Netgainsorlossesonfinancialinstrumentsdesignatedatfairvaluethroughprofitorloss
3081 24300101 - Disclosure - Other Operating Income and Expenses_Details Of Other Operating Income And Expenses(Details) Network

*

*

 http://www.kbfg.com/role/OtherOperatingIncomeAndExpensesDetailsOfOtherOperatingIncomeAndExpensesDetails
3082 Implied Table Table

*

*

 implied:Table
3083 Disclosure Of Other Operating Income And Expenses Abstract [Abstract] Abstract kb:DisclosureOfOtherOperatingIncomeAndExpensesAbstract
3084 Other operating income Abstract kb:OtherOperatingIncomeAbstract
3085 Revenue related to available-for-sale financial assets Abstract kb:RevenueRelatedToAvailableForSaleFinancialAssetsAbstract
3086 Gain on redemption of available-for-sale financial assets Concept (Monetary) For Period Credit kb:GainOnRedemptionOfAvailableForSaleFinancialAssets
3087 Gain on sale of available-for-sale financial assets Concept (Monetary) For Period Credit kb:GainOnSaleOfAvailableForSaleFinancialAssets
3088 Reversal for impairment on available-for-sale financial assets Concept (Monetary) For Period Credit kb:ReversalForImpairmentOnAvailableForSaleFinancialAssets
3089 Sub-total Concept (Monetary) For Period Credit kb:RevenueRelatedToAvailableForSaleFinancialAssets
3090 Revenue related to held-to-maturity financial assets Abstract kb:RevenueRelatedToAvailableForSaleHeldToMaturityInvestmentFinancialAssetsAbstract
3091 Gain on redemption of held-to-maturity financial assets Concept (Monetary) For Period Credit kb:GainOnRedemptionOfAvailableForSaleHeldToMaturityInvestmentFinancialAssets
3092 Gain on sale of held-to-maturity financial assets Concept (Monetary) For Period Credit kb:GainOnSaleOfAvailableForSaleHeldToMaturityInvestmentFinancialAssets
3093 Sub-total Concept (Monetary) For Period Credit kb:RevenueRelatedToAvailableForSaleHeldToMaturityInvestmentFinancialAssets
3094 Gain on foreign exchange transactions Concept (Monetary) For Period Credit ifrs-full:NetForeignExchangeGain
3095 Dividend income Concept (Monetary) For Period Credit ifrs-full:RevenueFromDividends
3096 Others Concept (Monetary) For Period Credit ifrs-full:MiscellaneousOtherOperatingIncome
3097 Total other operating income Concept (Monetary) For Period Credit us-gaap:OtherOperatingIncome
3098 Other operating expenses Abstract kb:OtherOperatingExpensesAbstract
3099 Expense related to available-for-sale financial assets Abstract kb:ExpenseRelatedToAvailableForSaleFinancialAssetsAbstract
3100 Loss on redemption of available-for-sale financial assets Concept (Monetary) For Period Debit kb:LossOnRedemptionOfAvailableForSaleFinancialAssets
3101 Loss On Sale Of Available For Sale Financial Assets Concept (Monetary) For Period Debit kb:LossOnSaleOfAvailableForSaleFinancialAssets
3102 Impairment on available-for-sale financial assets Concept (Monetary) For Period Debit kb:ImpairmentOnAvailableForSaleFinancialAssets
3103 Sub-total Concept (Monetary) For Period Debit kb:ExpenseRelatedToAvailableForSaleFinancialAssets
3104 Loss on foreign exchanges transactions Concept (Monetary) For Period Debit ifrs-full:NetForeignExchangeLoss
3105 Others Concept (Monetary) For Period Debit ifrs-full:MiscellaneousOtherOperatingExpense
3106 Total other operating expenses Concept (Monetary) For Period Debit kb:OtherOperatingExpenses
3107 Net other operating income (expenses) Concept (Monetary) For Period Credit ifrs-full:OtherOperatingIncomeExpense
3108 24310101 - Disclosure - General and Administrative Expenses_Details Of General And Administrative Expenses(Details) Network

*

*

 http://www.kbfg.com/role/GeneralAndAdministrativeExpensesDetailsOfGeneralAndAdministrativeExpensesDetails
3109 Implied Table Table

*

*

 implied:Table
3110 Disclosure Of General And Administrative Expense Abstract [Abstract] Abstract kb:DisclosureOfGeneralAndAdministrativeExpenseAbstract
3111 Selling General And Administrative Expense Abstract [Abstract] Abstract ifrs-full:SellingGeneralAndAdministrativeExpenseAbstract
3112 Employee Benefits Abstract ifrs-full:ClassesOfEmployeeBenefitsExpenseAbstract
3113 Salaries and short-term employee benefits - salaries Concept (Monetary) For Period Debit ifrs-full:WagesAndSalaries
3114 Salaries and short-term employee benefits - others Concept (Monetary) For Period Debit ifrs-full:OtherShorttermEmployeeBenefits
3115 Post-employment benefits - defined benefit plans Concept (Monetary) For Period Debit kb:PostemploymentBenefitExpenseDefinedBenefitPlansRecognizedAsGeneralAndAdministrativeExpense
3116 Post-employment benefits - defined contribution plans Concept (Monetary) For Period Debit ifrs-full:PostemploymentBenefitExpenseDefinedContributionPlans
3117 Termination benefits Concept (Monetary) For Period Debit ifrs-full:TerminationBenefitsExpense
3118 Share-based payments Concept (Monetary) For Period Debit ifrs-full:ExpenseFromSharebasedPaymentTransactionsWithEmployees
3119 Sub-total Concept (Monetary) For Period Debit ifrs-full:ShorttermEmployeeBenefitsExpense
3120 Depreciation and amortization Concept (Monetary) For Period Debit ifrs-full:DepreciationAndAmortisationExpense
3121 Other general and administrative expenses Abstract kb:OtherGeneralAndAdministrativeExpenseAbstract
3122 Rental expense Concept (Monetary) For Period Debit ifrs-full:RentalExpense
3123 Tax and dues Concept (Monetary) For Period Debit ifrs-full:TaxExpenseOtherThanIncomeTaxExpense
3124 Communication Concept (Monetary) For Period Debit ifrs-full:CommunicationExpense
3125 Electricity and utilities Concept (Monetary) For Period Debit ifrs-full:UtilitiesExpense
3126 Publication Concept (Monetary) For Period Debit kb:PublicationExpense
3127 Repairs and maintenance Concept (Monetary) For Period Debit ifrs-full:RepairsAndMaintenanceExpense
3128 Vehicle Concept (Monetary) For Period Debit ifrs-full:FuelAndEnergyExpense
3129 Travel Concept (Monetary) For Period Debit ifrs-full:TravelExpense
3130 Training Concept (Monetary) For Period Debit kb:TrainingExpense
3131 Service fees Concept (Monetary) For Period Debit ifrs-full:ProfessionalFeesExpense
3132 Electronic data processing expenses Concept (Monetary) For Period Debit ifrs-full:BankAndSimilarCharges
3133 Advertising Concept (Monetary) For Period Debit us-gaap:AdvertisingExpense
3134 Others Concept (Monetary) For Period Debit ifrs-full:OtherExpenseByFunction
3135 Sub-total Concept (Monetary) For Period Debit us-gaap:OtherGeneralAndAdministrativeExpense
3136 Total Concept (Monetary) For Period Debit ifrs-full:GeneralAndAdministrativeExpense
3137 24310102 - Disclosure - General and Administrative Expenses_Details Of Stock Grants Linked To Longterm And Shortterm Performance(Details) Network

*

*

 http://www.kbfg.com/role/GeneralAndAdministrativeExpensesDetailsOfStockGrantsLinkedToLongtermAndShorttermPerformanceDetails
3138 Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Table [Table] Table

*

*

 ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
3139 Consolidated Entities Axis [Axis] Axis us-gaap:ConsolidatedEntitiesAxis
3140 Consolidated Entities Domain[Domain] Member us-gaap:ConsolidatedEntitiesDomain
3141 Parent Company Member [Member] Member us-gaap:ParentCompanyMember
3142 KB Financial Group Inc. Member kb:KBFinancialGroupIncMember
3143 Subsidiaries Member [Member] Member ifrs-full:SubsidiariesMember
3144 Kookmin Bank Member kb:KookminBankMember
3145 Other subsidiaries Member kb:OtherSubsidiariesAndAssociateMember
3146 Types Of Sharebased Payment Arrangements Axis [Axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
3147 Sharebased Payment Arrangements Member [Domain] Member ifrs-full:SharebasedPaymentArrangementsMember
3148 Linked to long term performance Member kb:LinkedToLongTermPerformanceMember
3149 Series 14 Member kb:Series14Member
3150 Series 15 Member kb:Series15Member
3151 Series 17 Member kb:Series17Member
3152 Series 18 Member kb:Series18Member
3153 Series 64 Member kb:Series64Member
3154 Series 65 Member kb:Series65Member
3155 Series 67 Member kb:Series67Member
3156 Series 68 Member kb:Series68Member
3157 Series 69 Member kb:Series69Member
3158 Series 70 Member kb:Series70Member
3159 Series 71 Member kb:Series71Member
3160 Series 72 Member kb:Series72Member
3161 Deferred grant in 2012 Member kb:DeferredGrantIn2012Member
3162 Deferred grant in 2013 Member kb:DeferredGrantIn2013Member
3163 Deferred grant in 2014 Member kb:DeferredGrantIn2014Member
3164 Deferred grant in 2015 Member kb:DeferredGrantIn2015Member
3165 Deferred grant in 2016 Member kb:DeferredGrantIn2016Member
3166 Deferred grant in 2017 Member kb:DeferredGrantIn2017Member
3167 Stock granted in 2010 Member kb:LongTermStockGrantedIn2010Member
3168 Stock granted in 2011 Member kb:LongTermStockGrantedIn2011Member
3169 Stock granted in 2012 Member kb:LongTermStockGrantedIn2012Member
3170 Stock granted in 2013 Member kb:LongTermStockGrantedIn2013Member
3171 Stock granted in 2014 Member kb:LongTermStockGrantedIn2014Member
3172 Stock granted in 2015 Member kb:LongTermStockGrantedIn2015Member
3173 Stock granted in 2016 Member kb:LongTermStockGrantedIn2016Member
3174 Stock granted in 2017 Member kb:LongTermStockGrantedIn2017Member
3175 Linked to short-term performance Member kb:LinkedToShortTermPerformanceMember
3176 Stock granted in 2010 Member kb:ShortTermStockGrantedIn2010Member
3177 Stock granted in 2011 Member kb:ShortTermStockGrantedIn2011Member
3178 Stock granted in 2012 Member kb:ShortTermStockGrantedIn2012Member
3179 Stock granted in 2013 Member kb:ShortTermStockGrantedIn2013Member
3180 Stock granted in 2014 Member kb:ShortTermStockGrantedIn2014Member
3181 Stock granted in 2015 Member kb:ShortTermStockGrantedIn2015Member
3182 Stock granted in 2016 Member kb:ShortTermStockGrantedIn2016Member
3183 Stock granted in 2017 Member kb:ShortTermStockGrantedIn2017Member
3184 Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement Line Items [Line Items] LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
3185 Explanation Of Share Options In Sharebased Payment Arrangement Concept (Text/String) For Period ifrs-full:ExplanationOfShareOptionsInSharebasedPaymentArrangement
3186 Grant date Concept (Text/String) For Period ifrs-full:DateOfGrantOfSharebasedPaymentArrangement
3187 Number of granted shares Concept (Decimal) For Period ifrs-full:NumberOfInstrumentsGrantedInSharebasedPaymentArrangement
3188 Estimated number of vested shares Concept (Decimal) As Of kb:EstimatedNumberOfVestedSharesInSharebasedPaymentArrangement
3189 Vesting conditions Concept (Text/String) For Period ifrs-full:DescriptionOfVestingRequirementsForSharebasedPaymentArrangement
3190 Description Of Maximum Term Of Options Granted For Sharebased Payment Arrangement Concept (Text/String) For Period ifrs-full:DescriptionOfMaximumTermOfOptionsGrantedForSharebasedPaymentArrangement
3191 Description Of Method Of Settlement For Sharebased Payment Arrangement Concept (Text/String) For Period ifrs-full:DescriptionOfMethodOfSettlementForSharebasedPaymentArrangement
3192 24310103 - Disclosure - General and Administrative Expenses_Share Grants Are Measured At Fair Value Using The Monte Carlo Simulation Model And Assumptions Used In Determining The Fair Value(Details) Network

*

*

 http://www.kbfg.com/role/GeneralAndAdministrativeExpensesShareGrantsAreMeasuredAtFairValueUsingTheMonteCarloSimulationModelAndAssumptionsUsedInDeterminingTheFairValueDetails
3193 Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Table [Table] Table

*

*

 kb:DisclosureOfIndirectMeasurementOfFairValueOfGoodsOrServicesReceivedShareGrantsDuringPeriodTable
3194 Consolidated Entities Axis [Axis] Axis us-gaap:ConsolidatedEntitiesAxis
3195 Consolidated Entities Domain[Domain] Member us-gaap:ConsolidatedEntitiesDomain
3196 Parent Company Member [Member] Member us-gaap:ParentCompanyMember
3197 KB Financial Group Inc. Member kb:KBFinancialGroupIncMember
3198 Subsidiaries Member [Member] Member ifrs-full:SubsidiariesMember
3199 Kookmin Bank Member kb:KookminBankMember
3200 Other subsidiaries Member kb:OtherSubsidiariesAndAssociateMember
3201 Types Of Sharebased Payment Arrangements Axis [Axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
3202 Sharebased Payment Arrangements Member [Domain] Member ifrs-full:SharebasedPaymentArrangementsMember
3203 Linked to long term performance Member kb:LinkedToLongTermPerformanceMember
3204 Series 14 Member kb:Series14Member
3205 Series 15 Member kb:Series15Member
3206 Series 17 Member kb:Series17Member
3207 Series 18 Member kb:Series18Member
3208 Series 64 Member kb:Series64Member
3209 Series 65 Member kb:Series65Member
3210 Series 67 Member kb:Series67Member
3211 Series 68 Member kb:Series68Member
3212 Series 69 Member kb:Series69Member
3213 Series 70 Member kb:Series70Member
3214 Series 71 Member kb:Series71Member
3215 Series 72 Member kb:Series72Member
3216 Deferred grant in 2012 Member kb:DeferredGrantIn2012Member
3217 Deferred grant in 2013 Member kb:DeferredGrantIn2013Member
3218 Deferred grant in 2014 Member kb:DeferredGrantIn2014Member
3219 Deferred grant in 2015 Member kb:DeferredGrantIn2015Member
3220 Deferred grant in 2016 Member kb:DeferredGrantIn2016Member
3221 Deferred grant in 2017 Member kb:DeferredGrantIn2017Member
3222 Stock granted in 2010 Member kb:LongTermStockGrantedIn2010Member
3223 Stock granted in 2011 Member kb:LongTermStockGrantedIn2011Member
3224 Stock granted in 2012 Member kb:LongTermStockGrantedIn2012Member
3225 Stock granted in 2013 Member kb:LongTermStockGrantedIn2013Member
3226 Stock granted in 2014 Member kb:LongTermStockGrantedIn2014Member
3227 Stock granted in 2015 Member kb:LongTermStockGrantedIn2015Member
3228 Stock granted in 2016 Member kb:LongTermStockGrantedIn2016Member
3229 Stock granted in 2017 Member kb:LongTermStockGrantedIn2017Member
3230 Linked to short-term performance Member kb:LinkedToShortTermPerformanceMember
3231 Stock granted in 2010 Member kb:ShortTermStockGrantedIn2010Member
3232 Stock granted in 2011 Member kb:ShortTermStockGrantedIn2011Member
3233 Stock granted in 2012 Member kb:ShortTermStockGrantedIn2012Member
3234 Stock granted in 2013 Member kb:ShortTermStockGrantedIn2013Member
3235 Stock granted in 2014 Member kb:ShortTermStockGrantedIn2014Member
3236 Stock granted in 2015 Member kb:ShortTermStockGrantedIn2015Member
3237 Stock granted in 2016 Member kb:ShortTermStockGrantedIn2016Member
3238 Stock granted in 2017 Member kb:ShortTermStockGrantedIn2017Member
3239 Range Axis [Axis] Axis ifrs-full:RangeAxis
3240 Ranges Member [Domain] Member ifrs-full:RangesMember
3241 Bottom Of Range Member [Member] Member ifrs-full:BottomOfRangeMember
3242 Top Of Range Member [Member] Member ifrs-full:TopOfRangeMember
3243 Disclosure Of Indirect Measurement Of Fair Value Of Goods Or Services Received Share Grants During Period Line Items [Line Items] LineItems kb:DisclosureOfIndirectMeasurementOfFairValueOfGoodsOrServicesReceivedShareGrantsDuringPeriodLineItems
3244 Expected exercise period (Years) Concept (Decimal) For Period kb:ExpectedExercisePeriodIndirectMeasurementOfFairValueShareGrants
3245 Risk free rate (%) Concept (Percent) As Of kb:RiskFreeRateIndirectMeasurementOfFairValueOfShareGrants
3246 Fair value (Market performance condition) Concept (Monetary) As Of Credit kb:FairValueAtMeasurementDateMarketPerformanceConditionShareGrants
3247 Fair value (Non-market performance condition) Concept (Monetary) As Of Credit kb:FairValueAtMeasurementDateNonMarketPerformanceConditionShareGrants
3248 Information About How Expected Volatility Was Determined Share Grants Concept (Text/String) For Period kb:InformationAboutHowExpectedVolatilityWasDeterminedShareGrants
3249 Information About How Current Stock Price Was Determined Share Grants Concept (Text/String) For Period kb:InformationAboutHowCurrentStockPriceWasDeterminedShareGrants
3250 Information Whether And How Expected Dividends Were Incorporated Into Measurement Of Fair Value Stock Grants Concept (Text/String) For Period kb:InformationWhetherAndHowExpectedDividendsWereIncorporatedIntoMeasurementOfFairValueStockGrants
3251 Explanation Of Effect Of Share Grants On Financial Positions Concept (Text/String) For Period kb:ExplanationOfEffectOfShareGrantsOnFinancialPositions
3252 Liabilities From Share Grants Concept (Monetary) As Of Credit kb:LiabilitiesFromShareGrants
3253 Explanation Of Effect Of Share Grants On Profit Or Loss Concept (Text/String) For Period kb:ExplanationOfEffectOfShareGrantsOnProfitOrLoss
3254 Expense From Share Grants Transactions With Employees Concept (Monetary) For Period Debit kb:ExpenseFromShareGrantsTransactionsWithEmployees
3255 24310104 - Disclosure - General and Administrative Expenses_Details Of Mileage Stock(Details) Network

*

*

 http://www.kbfg.com/role/GeneralAndAdministrativeExpensesDetailsOfMileageStockDetails
3256 Disclosure Of Terms And Conditions Of Mileage Stock Table [Table] Table

*

*

 kb:DisclosureOfTermsAndConditionsOfMileageStockTable
3257 Types Of Sharebased Payment Arrangements Axis [Axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
3258 Sharebased Payment Arrangements Member [Domain] Member ifrs-full:SharebasedPaymentArrangementsMember
3259 Stock granted in 2016 Member kb:StockGrantedIn2016Member
3260 Stock Granted In201601 Member [Member] Member kb:StockGrantedIn201601Member
3261 Stock Granted In201602 Member [Member] Member kb:StockGrantedIn201602Member
3262 Stock Granted In201603 Member [Member] Member kb:StockGrantedIn201603Member
3263 Stock Granted In201604 Member [Member] Member kb:StockGrantedIn201604Member
3264 Stock Granted In201605 Member [Member] Member kb:StockGrantedIn201605Member
3265 Stock Granted In201606 Member [Member] Member kb:StockGrantedIn201606Member
3266 Stock Granted In201607 Member [Member] Member kb:StockGrantedIn201607Member
3267 Stock Granted In201608 Member [Member] Member kb:StockGrantedIn201608Member
3268 Stock Granted In201609 Member [Member] Member kb:StockGrantedIn201609Member
3269 Stock Granted In201610 Member [Member] Member kb:StockGrantedIn201610Member
3270 Stock Granted In201611 Member [Member] Member kb:StockGrantedIn201611Member
3271 Stock Granted In201612 Member [Member] Member kb:StockGrantedIn201612Member
3272 Stock Granted In201613 Member [Member] Member kb:StockGrantedIn201613Member
3273 Stock Granted In201614 Member [Member] Member kb:StockGrantedIn201614Member
3274 Stock Granted In201615 Member [Member] Member kb:StockGrantedIn201615Member
3275 Stock Granted In201616 Member [Member] Member kb:StockGrantedIn201616Member
3276 Stock granted in 2017 Member kb:StockGrantedIn2017Member
3277 Stock Granted in201701 Member [Member] Member kb:StockGrantedIn201701Member
3278 Stock Granted in201702 Member [Member] Member kb:StockGrantedIn201702Member
3279 Stock Granted in201703 Member [Member] Member kb:StockGrantedIn201703Member
3280 Stock Granted in201704 Member [Member] Member kb:StockGrantedIn201704Member
3281 Stock Granted in201705 Member [Member] Member kb:StockGrantedIn201705Member
3282 Stock Granted in201706 Member [Member] Member kb:StockGrantedIn201706Member
3283 Stock Granted in201707 Member [Member] Member kb:StockGrantedIn201707Member
3284 Stock Granted in201708 Member [Member] Member kb:StockGrantedIn201708Member
3285 Stock Granted in201709 Member [Member] Member kb:StockGrantedIn201709Member
3286 Stock Granted in201710 Member [Member] Member kb:StockGrantedIn201710Member
3287 Stock Granted in201711 Member [Member] Member kb:StockGrantedIn201711Member
3288 Stock Granted in201712 Member [Member] Member kb:StockGrantedIn201712Member
3289 Stock Granted in201713 Member [Member] Member kb:StockGrantedIn201713Member
3290 Stock Granted in201714 Member [Member] Member kb:StockGrantedIn201714Member
3291 Stock Granted in201715 Member [Member] Member kb:StockGrantedIn201715Member
3292 Stock Granted in201716 Member [Member] Member kb:StockGrantedIn201716Member
3293 Stock Granted in201717 Member [Member] Member kb:StockGrantedIn201717Member
3294 Disclosure Of Terms And Conditions Of Mileage Stock Line Items [Line Items] LineItems kb:DisclosureOfTermsAndConditionsOfMileageStockLineItems
3295 Grant date Concept (Date) For Period kb:DateOfGrantOfMileageStock
3296 Number of granted shares Concept (Decimal) For Period kb:NumberOfSharesGrantedInMileageStock
3297 Expected exercise period (Years) Concept (Decimal) For Period kb:ExpectedExercisPeriodOfMileageStock
3298 Remaining shares Concept (Decimal) As Of kb:NumberOfSharesRemainingInMileageStock
3299 Description Of Method Of Settlement For Mileage Stock Concept (Text/String) For Period kb:DescriptionOfMethodOfSettlementForMileageStock
3300 Additional Information About Remaining Shares Of Mileage Stock Concept (Text/String) For Period kb:AdditionalInformationAboutRemainingSharesOfMileageStock
3301 24310104 - Disclosure - General and Administrative Expenses_Details Of Mileage Stock(Details) Network

*

*

 http://www.kbfg.com/role/GeneralAndAdministrativeExpensesDetailsOfMileageStockDetails
3302 Implied Table Table

*

*

 implied:Table
3303 Disclosure Of Terms And Conditions Of Mileage Stock Abstract [Abstract] Abstract kb:DisclosureOfTermsAndConditionsOfMileageStockAbstract
3304 Explanation Of Effect Of Mileage Stock On Financial Positions Concept (Text/String) For Period kb:ExplanationOfEffectOfMileageStockOnFinancialPositions
3305 Liabilities From Mileage Stock Concept (Monetary) As Of Credit kb:LiabilitiesFromMileageStock
3306 Explanation Of Effect Of Mileage Stock On Profit Or Loss Concept (Text/String) For Period kb:ExplanationOfEffectOfMileageStockOnProfitOrLoss
3307 Expense From Mileage Stock Transactions With Employees Concept (Monetary) For Period Debit kb:ExpenseFromMileageStockTransactionsWithEmployees
3308 24320101 - Disclosure - Net Other Non-operating Income and Expenses_Details Of Other Nonoperating Income And Expenses(Details) Network

*

*

 http://www.kbfg.com/role/NetOtherNonOperatingIncomeAndExpensesDetailsOfOtherNonoperatingIncomeAndExpensesDetails
3309 Implied Table Table

*

*

 implied:Table
3310 Details Of Other Non Operating Income And Expenses Abstract [Abstract] Abstract kb:DetailsOfOtherNonOperatingIncomeAndExpensesAbstract
3311 Other non-operating income Abstract kb:OtherNonOperatingIncomeAbstract
3312 Gain on disposal in property and equipment Concept (Monetary) For Period Credit ifrs-full:GainsOnDisposalsOfPropertyPlantAndEquipment
3313 Rent received Concept (Monetary) For Period Credit ifrs-full:RentalIncome
3314 Gains on bargain purchase Concept (Monetary) For Period Credit ifrs-full:GainRecognisedInBargainPurchaseTransaction
3315 Gain on sales of disposal group held for sale Concept (Monetary) For Period Credit kb:GainOnSalesOfDisposalGroupHeldForSale
3316 Others Concept (Monetary) For Period Credit kb:OthersOtherNonOperatingIncome
3317 Sub-total Concept (Monetary) For Period Credit us-gaap:OtherNonoperatingIncome
3318 Other non-operating expenses Abstract kb:OtherNonOperatingExpensesAbstract
3319 Loss on disposal in property and equipment Concept (Monetary) For Period Debit ifrs-full:LossesOnDisposalsOfPropertyPlantAndEquipment
3320 Donation Concept (Monetary) For Period Debit kb:DonationsAndSubsidies
3321 Restoration cost Concept (Monetary) For Period Debit kb:RestorationCost
3322 Management cost for special bonds Concept (Monetary) For Period Debit kb:ManagementCostForSpecialBonds
3323 Loss on sales of disposal group held for sale Concept (Monetary) For Period Debit kb:LossOnSalesOfDisposalGroupHeldForSale
3324 Impairment loss on disposition of disposal group held for sale Concept (Monetary) For Period Debit kb:ImpairmentLossForDisposalGroupHeldForSale
3325 Impairment loss for goodwill Concept (Monetary) For Period ifrs-full:ImpairmentLossRecognisedInProfitOrLossGoodwill
3326 Others Concept (Monetary) For Period Debit kb:OthersOtherNonOperatingExpense
3327 Sub-total Concept (Monetary) For Period Debit kb:OtherNonOperatingExpenses
3328 Net other non-operating income Concept (Monetary) For Period Credit kb:NetOtherNonOperatingIncome
3329 24330101 - Disclosure - Income Tax Expense_Income Tax Expense(Details) Network

*

*

 http://www.kbfg.com/role/IncomeTaxExpenseIncomeTaxExpenseDetails
3330 Implied Table Table

*

*

 implied:Table
3331 Major Components Of Tax Expense Income Abstract [Abstract] Abstract ifrs-full:MajorComponentsOfTaxExpenseIncomeAbstract
3332 Tax payable Abstract ifrs-full:CurrentTaxExpenseIncomeAndAdjustmentsForCurrentTaxOfPriorPeriodsAbstract
3333 Current tax expense Concept (Monetary) For Period Debit ifrs-full:CurrentTaxExpenseIncome
3334 Adjustments recognized in the period for current tax of prior years Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForCurrentTaxOfPriorPeriod
3335 Sub-total Concept (Monetary) For Period Debit ifrs-full:CurrentTaxExpenseIncomeAndAdjustmentsForCurrentTaxOfPriorPeriods
3336 Changes in deferred income tax assets (liabilities) Concept (Monetary) For Period Debit ifrs-full:DeferredTaxExpenseIncomeRelatingToOriginationAndReversalOfTemporaryDifferences
3337 Income tax recognized directly in equity Abstract ifrs-full:IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeAbstract
3338 Exchange difference in foreign operation Concept (Monetary) For Period Debit ifrs-full:IncomeTaxRelatingToExchangeDifferencesOnTranslationOfOtherComprehensiveIncome
3339 Remeasurements of net defined benefit liabilities Concept (Monetary) For Period Debit ifrs-full:IncomeTaxRelatingToRemeasurementsOfDefinedBenefitPlansOfOtherComprehensiveIncome
3340 Change in value of available-for-sale financial assets Concept (Monetary) For Period Debit ifrs-full:IncomeTaxRelatingToAvailableforsaleFinancialAssetsOfOtherComprehensiveIncome
3341 Change in value of held-to-maturity financial assets Concept (Monetary) For Period Debit kb:IncomeTaxRelatingToHeldToMaturityFinancialAssetsOfOtherComprehensiveIncome
3342 Share of other comprehensive loss of associates Concept (Monetary) For Period Debit ifrs-full:IncomeTaxRelatingToShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
3343 Cash flow hedges Concept (Monetary) For Period Debit ifrs-full:IncomeTaxRelatingToCashFlowHedgesOfOtherComprehensiveIncome
3344 Hedges of a net investment in a foreign operation Concept (Monetary) For Period Debit ifrs-full:IncomeTaxRelatingToHedgesOfNetInvestmentsInForeignOperationsOfOtherComprehensiveIncome
3345 Other comprehensive income for assets held for sale Concept (Monetary) For Period Debit kb:IncomeTaxRelatingToOtherComprehensiveIncomeForAssetsHeldForSale
3346 Other comprehensive income for separate accounts Concept (Monetary) For Period Debit kb:IncomeTaxRelatingToOtherComprehensiveIncomeForSeparateAccounts
3347 Sub-total Concept (Monetary) For Period ifrs-full:IncomeTaxRelatingToComponentsOfOtherComprehensiveIncome
3348 Others Concept (Monetary) For Period Debit kb:OtherIncomeTaxExpense
3349 Average effective tax rate and tax expense (Tax rate) Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
3350 Description of amended tax rate by taxable income Concept (Text/String) For Period kb:DescriptionOfAmendedTaxRateByTaxableIncome
3351 24330102 - Disclosure - Income Tax Expense_An Analysis Of The Net Profit Before Income Tax And Income Tax Expense(Details) Network

*

*

 http://www.kbfg.com/role/IncomeTaxExpenseAnAnalysisOfTheNetProfitBeforeIncomeTaxAndIncomeTaxExpenseDetails
3352 Implied Table Table

*

*

 implied:Table
3353 Reconciliation Of Average Effective Tax Rate And Applicable Tax Rate Abstract [Abstract] Abstract ifrs-full:ReconciliationOfAverageEffectiveTaxRateAndApplicableTaxRateAbstract
3354 Net profit before income tax Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
3355 Tax at the applicable tax rate (Amount) Concept (Monetary) For Period Debit ifrs-full:TaxExpenseIncomeAtApplicableTaxRate
3356 Non-taxable income (Amount) Concept (Monetary) For Period Credit ifrs-full:TaxEffectOfRevenuesExemptFromTaxation2011
3357 Non-deductible expense (Amount) Concept (Monetary) For Period Debit us-gaap:IncomeTaxReconciliationNondeductibleExpense
3358 Tax credit and tax exemption (Amount) Concept (Monetary) For Period Debit kb:IncomeTaxReconciliationTaxCreditsAndTaxExemption
3359 Temporary difference for which no deferred tax is recognized (Amount) Concept (Monetary) For Period Credit ifrs-full:TaxBenefitArisingFromPreviouslyUnrecognisedTaxLossTaxCreditOrTemporaryDifferenceOfPriorPeriodUsedToReduceDeferredTaxExpense
3360 Deferred tax relating to changes in recognition and measurement (Amount) Concept (Monetary) For Period Debit ifrs-full:DeferredTaxExpenseArisingFromWritedownOrReversalOfWritedownOfDeferredTaxAsset
3361 Income tax refund for tax of prior years (Amount) Concept (Monetary) For Period Debit us-gaap:IncomeTaxReconciliationPriorYearIncomeTaxes
3362 Income tax expense of overseas branch (Amount) Concept (Monetary) For Period Debit us-gaap:IncomeTaxReconciliationRepatriationOfForeignEarnings
3363 Effects from change in tax rate (Tax rate) Concept (Monetary) For Period Debit ifrs-full:TaxEffectFromChangeInTaxRate
3364 Others (Amount) Concept (Monetary) For Period Debit ifrs-full:OtherTaxEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome
3365 Tax expense Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
3366 Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation Abstract [Abstract] Abstract us-gaap:EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract
3367 Tax at the applicable tax rate (Tax rate) Concept (Percent) For Period ifrs-full:ApplicableTaxRate
3368 Non-taxable income (Tax rate) Concept (Percent) For Period us-gaap:EffectiveIncomeTaxRateReconciliationTaxExemptIncome
3369 Non-deductible expense (Tax rate) Concept (Percent) For Period us-gaap:EffectiveIncomeTaxRateReconciliationNondeductibleExpense
3370 Tax credit and tax exemption (Tax rate) Concept (Percent) For Period kb:EffectiveIncomeTaxRateReconciliationTaxCreditsAndTaxExemption
3371 Temporary difference for which no deferred tax is recognized (Tax rate) Concept (Percent) For Period kb:EffectiveIncomeTaxRateReconciliationTemporaryDifferenceForWhichNoDeferredTaxIsRecognized
3372 Deferred tax relating to changes in recognition and measurement (Tax rate) Concept (Percent) For Period kb:EffectiveIncomeTaxRateReconciliationDeferredTaxRelatingToChangesInRecognitionAndMeasurement
3373 Income tax refund for tax of prior years (Tax rate) Concept (Percent) For Period us-gaap:EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes
3374 Income tax expense of overseas branch (Tax rate) Concept (Percent) For Period us-gaap:EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings
3375 Effects from change in tax rate (Tax rate) Concept (Percent) For Period us-gaap:EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate
3376 Others (Tax rate) Concept (Percent) For Period us-gaap:EffectiveIncomeTaxRateReconciliationOtherAdjustments
3377 Average effective tax rate Concept (Percent) For Period ifrs-full:AverageEffectiveTaxRate
3378 Description Of Applicable Tax Rate By Taxable Income Concept (Text/String) For Period kb:DescriptionOfApplicableTaxRateByTaxableIncome
3379 24330103 - Disclosure - Income Tax Expense_Details Of Current Tax Assets Income Tax Refund Receivables(Details) Network

*

*

 http://www.kbfg.com/role/IncomeTaxExpenseDetailsOfCurrentTaxAssetsIncomeTaxRefundReceivablesDetails
3380 Current Tax Assets Liabilities Table [Table] Table

*

*

 kb:CurrentTaxAssetsLiabilitiesTable
3381 Balance Sheet Location Axis [Axis] Axis us-gaap:BalanceSheetLocationAxis
3382 Balance Sheet Location Domain [Domain] Member us-gaap:BalanceSheetLocationDomain
3383 Current Tax Assets Liabilities Member [Member] Member kb:CurrentTaxAssetsLiabilitiesMember
3384 Current Tax Assets Member [Member] Member kb:CurrentTaxAssetsMember
3385 Current Tax Liabilities Member [Member] Member kb:CurrentTaxLiabilitiesMember
3386 Carrying Amount Accumulated Depreciation Amortisation And Impairment And Gross Carrying Amount Axis [Axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
3387 Tax payables (receivables) after offsetting Member ifrs-full:CarryingAmountMember
3388 Gross Carrying Amount Member ifrs-full:GrossCarryingAmountMember
3389 Offsetting Member ifrs-full:AccumulatedDepreciationAndAmortisationMember
3390 Current Tax Assets Liabilitie Line Items [Line Items] LineItems kb:CurrentTaxAssetsLiabilitieLineItems
3391 Income tax refund receivables Concept (Monetary) As Of Debit kb:IncomeTaxRefundReceivables
3392 Income tax payables Concept (Monetary) As Of Credit ifrs-full:CurrentTaxLiabilities
3393 Current Tax Assets Concept (Monetary) As Of Debit ifrs-full:CurrentTaxAssets
3394 24340101 - Disclosure - Dividends_Dividends(Details) Network

*

*

 http://www.kbfg.com/role/DividendsDividendsDetails
3395 Implied Table Table

*

*

 implied:Table
3396 Disclosure Of Dividends Abstract [Abstract] Abstract kb:DisclosureOfDividendsAbstract
3397 Dividends Recognised As Distributions To Owners Of Parent Concept (Monetary) For Period Debit ifrs-full:DividendsRecognisedAsDistributionsToOwnersOfParent
3398 Dividends Recognised As Distributions To Owners Per Share Concept (Share) For Period ifrs-full:DividendsRecognisedAsDistributionsToOwnersPerShare
3399 Dividends Proposed Or Declared Before Financial Statements Authorised For Issue But Not Recognised As Distribution To Owners Concept (Monetary) For Period ifrs-full:DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwners
3400 Dividends Proposed Or Declared Before Financial Statements Authorised For Issue But Not Recognised As Distribution To Owners Per Share Concept (Share) For Period ifrs-full:DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwnersPerShare
3401 24350101 - Disclosure - Accumulated Other Comprehensive Income_Details Of Accumulated Other Comprehensive Income(Details) Network

*

*

 http://www.kbfg.com/role/AccumulatedOtherComprehensiveIncomeDetailsOfAccumulatedOtherComprehensiveIncomeDetails
3402 Disclosure Of Analysis Of Other Comprehensive Income By Item Table [Table] Table

*

*

 ifrs-full:DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemTable
3403 Components Of Equity Axis [Axis] Axis ifrs-full:ComponentsOfEquityAxis
3404 Equity Member [Domain] Member ifrs-full:EquityMember
3405 Remeasurements of net defined benefit liabilities Member ifrs-full:ReserveOfRemeasurementsOfDefinedBenefitPlansMember
3406 Exchange differences on translating foreign operations Member ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember
3407 Change in the fair value of available-for-sale financial assets Member ifrs-full:ReserveOfGainsAndLossesOnRemeasuringAvailableforsaleFinancialAssetsMember
3408 Change in value of held-to-maturity financial assets Member kb:ReserveOfGainsAndLossesOnRemeasuringHeldToMaturityFinancialAssetsMember
3409 Shares of other comprehensive income of associates and joint ventures Member ifrs-full:ReserveOfGainsAndLossesFromInvestmentsInEquityInstrumentsMember
3410 Cash flow hedges Member ifrs-full:ReserveOfCashFlowHedgesMember
3411 Hedges of net investments in foreign operations Member ifrs-full:ReserveOfGainsAndLossesOnHedgingInstrumentsThatHedgeInvestmentsInEquityInstrumentsMember
3412 Other comprehensive income of separate account Member kb:AmountRecognisedInOtherComprehensiveIncomeAndAccumulatedInEquityRelatingToSeparateAccountMember
3413 Other comprehensive income of disposal group held for sale Member kb:AmountRecognisedInOtherComprehensiveIncomeAndAccumulatedInEquityRelatingToDisposalGroupHeldForSaleMember
3414 Other comprehensive income of assets held for sale Member kb:AmountRecognisedInOtherComprehensiveIncomeAndAccumulatedInEquityRelatingToAssetsHeldForSaleMember
3415 Disclosure Of Analysis Of Other Comprehensive Income By Item Line Items [Line Items] LineItems ifrs-full:DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemLineItems
3416 Beginning Concept (Monetary) As Of Credit ifrs-full:AccumulatedOtherComprehensiveIncome
3417 Changes except for reclassification Concept (Monetary) For Period Credit kb:OtherComprehensiveIncomeExceptForReclassificaitonBeforeTax
3418 Reclassification to profit or loss Concept (Monetary) For Period Debit ifrs-full:ReclassificationAdjustmentsOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeBeforeTax
3419 Tax effect Concept (Monetary) For Period ifrs-full:IncomeTaxRelatingToComponentsOfOtherComprehensiveIncome
3420 Replaced by retained earnings Concept (Monetary) For Period Credit kb:OtherComprehensiveIncomeReplacedByRetainedEarnings
3421 Replaced by assets held for sale Concept (Monetary) For Period Credit kb:OtherComprehensiveIncomeReplacedByAssetsHeldForSale
3422 Replaced by disposal group held for sale Concept (Monetary) For Period Credit kb:OtherComprehensiveIncomeReplacedByDisposalGroupHeldForSale
3423 Ending Concept (Monetary) As Of Credit ifrs-full:AccumulatedOtherComprehensiveIncome
3424 24360101 - Disclosure - Earnings per Share_Weighted Average Number Of Ordinary Shares(Details) Network

*

*

 http://www.kbfg.com/role/EarningsPerShareWeightedAverageNumberOfOrdinarySharesDetails
3425 Implied Table Table

*

*

 implied:Table
3426 Earnings Per Share Abstract [Abstract] Abstract ifrs-full:EarningsPerShareAbstract
3427 Weighted average number of ordinary shares outstanding Abstract ifrs-full:WeightedAverageSharesAndAdjustedWeightedAverageSharesAbstract
3428 Beginning (A) Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
3429 Issue of ordinary shares related to business combination (B) Concept (Shares) For Period kb:IssueOfOrdinarySharesRelatedToBusinessCombinationAdjustedWeightedAverageShares
3430 Acquisition of treasury shares (C) Concept (Shares) For Period kb:AcquisitionOfTreasurySharesAdjustedWeightedAverageShares
3431 Sales of treasury shares (D) Concept (Shares) For Period kb:SalesOfTreasurySharesAdjustedWeightedAverageShares
3432 Weighted average number of ordinary shares outstanding (E=A+B+C+D) Concept (Shares) For Period ifrs-full:WeightedAverageShares
3433 Basic earnings per share Abstract ifrs-full:BasicEarningsPerShareAbstract
3434 Explanation Of Adjustments Of Numerator To Calculate Basic Earnings Per Share Concept (Text/String) For Period ifrs-full:ExplanationOfAdjustmentsOfNumeratorToCalculateBasicEarningsPerShare
3435 Profit attributable to ordinary shares (F) Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOrdinaryEquityHoldersOfParentEntity
3436 Weighted average number of ordinary shares outstanding (G) Concept (Shares) For Period ifrs-full:WeightedAverageShares
3437 Basic earnings per share (H = F / G) Concept (Share) For Period ifrs-full:BasicEarningsLossPerShare
3438 24360102 - Disclosure - Earnings per Share_Diluted Earnings Per Share (Details) Network

*

*

 http://www.kbfg.com/role/EarningsPerShareDilutedEarningsPerShareDetails
3439 Implied Table Table

*

*

 implied:Table
3440 Basic And Diluted Earnings Per Share Abstract [Abstract] Abstract ifrs-full:BasicAndDilutedEarningsPerShareAbstract
3441 Explanation Of Adjustments Of Numerator To Calculate Diluted Earnings Per Share Concept (Text/String) For Period ifrs-full:ExplanationOfAdjustmentsOfNumeratorToCalculateDilutedEarningsPerShare
3442 Explanation Of Adjustments Between Denominators Used To Calculate Basic And Diluted Earnings Per Share Concept (Text/String) For Period ifrs-full:ExplanationOfAdjustmentsBetweenDenominatorsUsedToCalculateBasicAndDilutedEarningsPerShare
3443 Profit Loss Attributable To Ordinary Equity Holders Of Parent Entity Including Dilutive Effects Abstract [Abstract] Abstract kb:ProfitLossAttributableToOrdinaryEquityHoldersOfParentEntityIncludingDilutiveEffectsAbstract
3444 Profit attributable to ordinary shares Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOrdinaryEquityHoldersOfParentEntity
3445 Adjustment Concept (Monetary) For Period Debit ifrs-full:AdjustmentToProfitLossForPreferenceShareDividends
3446 Adjusted profit for diluted earnings Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOrdinaryEquityHoldersOfParentEntityIncludingDilutiveEffects
3447 Weighted Average Shares And Adjusted Weighted Average Shares Abstract Abstract ifrs-full:WeightedAverageSharesAndAdjustedWeightedAverageSharesAbstract
3448 Weighted average number of ordinary shares outstanding (G) Concept (Shares) For Period ifrs-full:WeightedAverageShares
3449 Adjustment: : Stock grants Concept (Shares) For Period ifrs-full:DilutiveEffectOfShareOptionsOnNumberOfOrdinaryShares
3450 Adjusted weighted average number of ordinary shares outstanding for diluted earnings per share Concept (Shares) For Period ifrs-full:AdjustedWeightedAverageShares
3451 Diluted Earnings Loss Per Share Abstract [Abstract] Abstract kb:DilutedEarningsLossPerShareAbstract
3452 Adjusted profit for diluted earnings Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOrdinaryEquityHoldersOfParentEntityIncludingDilutiveEffects
3453 Adjusted weighted average number of ordinary shares outstanding for diluted earnings per share Concept (Shares) For Period ifrs-full:AdjustedWeightedAverageShares
3454 Diluted earnings per share Concept (Share) For Period ifrs-full:BasicAndDilutedEarningsLossPerShare
3455 24370101 - Disclosure - Insurance Contracts_Details Of Deferred Acquisition Costs Included In Other Assets(Details) Network

*

*

 http://www.kbfg.com/role/InsuranceContractsDetailsOfDeferredAcquisitionCostsIncludedInOtherAssetsDetails
3456 Deferred Acquisition Costs Arising From InsuranceContractsTable[Table] Table

*

*

 kb:DeferredAcquisitionCostsArisingFromInsuranceContractsTable
3457 Types Of Insurance Contracts Axis [Axis] Axis ifrs-full:TypesOfInsuranceContractsAxis
3458 Insurance Contracts Member [Domain] Member ifrs-full:InsuranceContractsMember
3459 Non-life insurance Member ifrs-full:NonlifeInsuranceContractsMember
3460 Life insurance Member ifrs-full:LifeInsuranceContractsMember
3461 Deferred Acquisition Costs Arising From Insurance Contracts LineItems[Line Items] LineItems kb:DeferredAcquisitionCostsArisingFromInsuranceContractsLineItems
3462 Total Concept (Monetary) As Of Debit ifrs-full:DeferredAcquisitionCostsArisingFromInsuranceContracts
3463 24370102 - Disclosure - Insurance Contracts_Changes In The Deferred Acquisition Costs(Details) Network

*

*

 http://www.kbfg.com/role/InsuranceContractsChangesInTheDeferredAcquisitionCostsDetails
3464 Reconciliation Of Changes In Deferred Acquisition Costs Arising From Insurance Contracts Table[Table] Table

*

*

 kb:ReconciliationOfChangesInDeferredAcquisitionCostsArisingFromInsuranceContractsTable
3465 Types Of Insurance Contracts Axis [Axis] Axis ifrs-full:TypesOfInsuranceContractsAxis
3466 Insurance Contracts Member [Domain] Member ifrs-full:InsuranceContractsMember
3467 Non-life insurance Member ifrs-full:NonlifeInsuranceContractsMember
3468 Life insurance Member ifrs-full:LifeInsuranceContractsMember
3469 Reconciliation Of Changes In Deferred Acquisition Costs Arising From Insurance Contracts LineItems [Line Items] LineItems kb:ReconciliationOfChangesInDeferredAcquisitionCostsArisingFromInsuranceContractsLineItems
3470 Beginning Concept (Monetary) As Of Debit ifrs-full:DeferredAcquisitionCostsArisingFromInsuranceContracts
3471 Increase Concept (Monetary) For Period Debit kb:IncreaseInDeferredAcquisitionCostsArisingFromInsuranceContracts
3472 Decrease Concept (Monetary) For Period Credit kb:DecreaseInDeferredAcquisitionCostsArisingFromInsuranceContracts
3473 Ending Concept (Monetary) As Of Debit ifrs-full:DeferredAcquisitionCostsArisingFromInsuranceContracts
3474 24370103 - Disclosure - Insurance Contracts_Details of Reinsurance Assets Included In Other Assets(Details) Network

*

*

 http://www.kbfg.com/role/InsuranceContractsDetailsofReinsuranceAssetsIncludedInOtherAssetsDetails
3475 Details Of Reinsurance Assets Presented Within Other Assets Table[Table] Table

*

*

 kb:DetailsOfReinsuranceAssetsPresentedWithinOtherAssetsTable
3476 Types Of Insurance Contracts Axis [Axis] Axis ifrs-full:TypesOfInsuranceContractsAxis
3477 Insurance Contracts Member [Domain] Member ifrs-full:InsuranceContractsMember
3478 Non-life insurance Member ifrs-full:NonlifeInsuranceContractsMember
3479 General Insurance Member kb:GeneralInsuranceMember
3480 Automobile insurance Member kb:AutomobileInsuranceMember
3481 Long-term Insurance Member kb:LongTermInsuranceMember
3482 Life insurance Member ifrs-full:LifeInsuranceContractsMember
3483 Others Member kb:OtherInsuranceContractMember
3484 Types Of Reinsurance Assets[Axis] Axis kb:TypesOfReinsuranceAssetsAxis
3485 Total reinsurance assets Member kb:ReinsuranceAssetsMember
3486 Reserve for outstanding claims Member kb:ReserveForOutstandingClaimsReinsuranceAssetsMember
3487 Unearned premium reserve Member kb:UnearnedPremiumReserveReinsuranceAssetsMember
3488 Carrying Amount Accumulated Depreciation Amortisation And Impairment And Gross Carrying Amount Axis [Axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
3489 Carrying amount Member ifrs-full:CarryingAmountMember
3490 Gross Carrying Amount Member ifrs-full:GrossCarryingAmountMember
3491 Less: Allowances Member ifrs-full:AccumulatedImpairmentMember
3492 Details Of Reinsurance Assets Presented Within Other Assets LineItems[Line Items] LineItems kb:DetailsOfReinsuranceAssetsPresentedWithinOtherAssetsLineItems
3493 Reinsurance Assets Concept (Monetary) As Of Debit ifrs-full:ReinsuranceAssets
3494 24370104 - Disclosure - Insurance Contracts_The Changes In Reinsurance Assets Included In Other Assets(Details) Network

*

*

 http://www.kbfg.com/role/InsuranceContractsTheChangesInReinsuranceAssetsIncludedInOtherAssetsDetails
3495 Details Of Changes In Reinsurance Assets Presented Within Other Assets Table[Table] Table

*

*

 kb:DetailsOfChangesInReinsuranceAssetsPresentedWithinOtherAssetsTable
3496 Types Of Insurance Contracts Axis [Axis] Axis ifrs-full:TypesOfInsuranceContractsAxis
3497 Insurance Contracts Member [Domain] Member ifrs-full:InsuranceContractsMember
3498 Non-life insurance Member ifrs-full:NonlifeInsuranceContractsMember
3499 General Insurance Member kb:GeneralInsuranceMember
3500 Automobile insurance Member kb:AutomobileInsuranceMember
3501 Long-term Insurance Member kb:LongTermInsuranceMember
3502 Life insurance Member ifrs-full:LifeInsuranceContractsMember
3503 Others Member kb:OtherInsuranceContractMember
3504 Types Of Reinsurance Assets[Axis] Axis kb:TypesOfReinsuranceAssetsAxis
3505 Total reinsurance assets Member kb:ReinsuranceAssetsMember
3506 Reserve for outstanding claims Member kb:ReserveForOutstandingClaimsReinsuranceAssetsMember
3507 Unearned premium reserve Member kb:UnearnedPremiumReserveReinsuranceAssetsMember
3508 Carrying Amount Accumulated Depreciation Amortisation And Impairment And Gross Carrying Amount Axis [Axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
3509 Carrying amount Member ifrs-full:CarryingAmountMember
3510 Gross Carrying Amount Member ifrs-full:GrossCarryingAmountMember
3511 Less: Allowances Member ifrs-full:AccumulatedImpairmentMember
3512 Details Of Changes In Reinsurance Assets Presented Within Other Assets LineItems[Line Items] LineItems kb:DetailsOfChangesInReinsuranceAssetsPresentedWithinOtherAssetsLineItems
3513 Beginning Concept (Monetary) As Of Debit ifrs-full:ReinsuranceAssets
3514 Business combination Concept (Monetary) For Period Debit ifrs-full:AcquisitionsThroughBusinessCombinationsReinsuranceAssets
3515 Net increase (decrease) Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseInReinsuranceAssets
3516 Ending Concept (Monetary) As Of Debit ifrs-full:ReinsuranceAssets
3517 24370201 - Disclosure - Insurance Contracts_Details Of Insurance Liabilities(Details) Network

*

*

 http://www.kbfg.com/role/InsuranceContractsDetailsOfInsuranceLiabilitiesDetails
3518 Disclosure Of Types Of Insurance Contracts Table [Table] Table

*

*

 ifrs-full:DisclosureOfTypesOfInsuranceContractsTable
3519 Types Of Insurance Contracts Axis [Axis] Axis ifrs-full:TypesOfInsuranceContractsAxis
3520 Insurance Contracts Member [Domain] Member ifrs-full:InsuranceContractsMember
3521 Non-life insurance Member ifrs-full:NonlifeInsuranceContractsMember
3522 Life insurance Member ifrs-full:LifeInsuranceContractsMember
3523 Others Member kb:OtherInsuranceContractMember
3524 Disclosure Of Types Of Insurance Contracts Line Items [Line Items] LineItems ifrs-full:DisclosureOfTypesOfInsuranceContractsLineItems
3525 Liabilities Arising From Insurance Contracts Concept (Monetary) As Of Credit ifrs-full:LiabilitiesArisingFromInsuranceContracts
3526 Long-term insurance premium reserve Concept (Monetary) As Of Credit kb:LongTermInsurancePremiumReserve
3527 Reserve for outstanding claims Concept (Monetary) As Of Credit kb:ReserveForOutstandingClaims
3528 Unearned premium reserve Concept (Monetary) As Of Credit ifrs-full:UnearnedPremiums
3529 Reserve for participating policyholders’ dividends on long-term insurance Concept (Monetary) As Of Credit kb:ReserveForParticipatingPolicyholdersDividendsOnLongTermInsurance
3530 Unallocated Divisible Surplus to Future Policyholders Concept (Monetary) As Of Credit kb:UnallocatedDivisibleSurplusToFuturePolicyholders
3531 Reserve for compensation for losses on dividend paying insurance contracts Concept (Monetary) As Of Credit kb:ReserveForCompensationForLossesOnDividendPayingInsuranceContracts
3532 Guarantee reserve Concept (Monetary) As Of Credit kb:GuaranteeReserve
3533 24370202 - Disclosure - Insurance Contracts_Changes In Insurance Liability(Details) Network

*

*

 http://www.kbfg.com/role/InsuranceContractsChangesInInsuranceLiabilityDetails
3534 Disclosure Of Types Of Insurance Contracts Table [Table] Table

*

*

 ifrs-full:DisclosureOfTypesOfInsuranceContractsTable
3535 Types Of Insurance Contracts Axis [Axis] Axis ifrs-full:TypesOfInsuranceContractsAxis
3536 Insurance Contracts Member [Domain] Member ifrs-full:InsuranceContractsMember
3537 Non-life insurance Member ifrs-full:NonlifeInsuranceContractsMember
3538 General Insurance Member kb:GeneralInsuranceMember
3539 Automobile insurance Member kb:AutomobileInsuranceMember
3540 Long-term Insurance Member kb:LongTermInsuranceMember
3541 Long-term investment contract Member kb:LongTermInvestmentContractMemberMember
3542 Life Insurance Contracts Member [Member] Member ifrs-full:LifeInsuranceContractsMember
3543 Individual Insurance Member [Member] Member kb:IndividualInsuranceMember
3544 Pure endowment insurance Member kb:PureEndowmentInsuranceMember
3545 Death insurance Member kb:DeathInsuranceMember
3546 Joint insurance Member kb:JointInsuranceMember
3547 Group insurance Member kb:GroupInsuranceMember
3548 Other Member kb:OtherLifeInsuranceContractsMember
3549 Others Member kb:OtherInsuranceContractMember
3550 Changes In Liabilities Under Insurance Contracts And Reinsurance Contracts Issued Line Items [Line Items] LineItems kb:ChangesInLiabilitiesUnderInsuranceContractsAndReinsuranceContractsIssuedLineItems
3551 Beginning Concept (Monetary) As Of Credit ifrs-full:LiabilitiesArisingFromInsuranceContracts
3552 Business combination Concept (Monetary) For Period Credit ifrs-full:AcquisitionsThroughBusinessCombinationsLiabilitiesUnderInsuranceContractsAndReinsuranceContractsIssued
3553 Net increase (decrease) Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughOtherChangesLiabilitiesUnderInsuranceContractsAndReinsuranceContractsIssued
3554 Ending Concept (Monetary) As Of Credit ifrs-full:LiabilitiesArisingFromInsuranceContracts
3555 24370301 - Disclosure - Insurance Contracts_Assumptions And Basis For The Insurance Liability Adequacy Test(Details) Network

*

*

 http://www.kbfg.com/role/InsuranceContractsAssumptionsAndBasisForTheInsuranceLiabilityAdequacyTestDetails
3556 Assumptions And Basis For Insurance Liability Adequacy Test[Table] Table

*

*

 kb:AssumptionsAndBasisForInsuranceLiabilityAdequacyTestTable
3557 Types Of Insurance Contracts Axis [Axis] Axis ifrs-full:TypesOfInsuranceContractsAxis
3558 Insurance Contracts Member [Domain] Member ifrs-full:InsuranceContractsMember
3559 Non-life insurance Member ifrs-full:NonlifeInsuranceContractsMember
3560 General Insurance Member kb:GeneralInsuranceMember
3561 Automobile insurance Member kb:AutomobileInsuranceMember
3562 Long-term Insurance Member kb:LongTermInsuranceMember
3563 Life insurance Member ifrs-full:LifeInsuranceContractsMember
3564 Actuarial Assumptions Axis [Axis] Axis ifrs-full:ActuarialAssumptionsAxis
3565 Actuarial Assumptions Member [Domain] Member ifrs-full:ActuarialAssumptionsMember
3566 Discount rate Member ifrs-full:ActuarialAssumptionOfDiscountRatesMember
3567 Expense ratio Member kb:ExpenseRatioMember
3568 Lapse ratio Member kb:LapseRatioMember
3569 Mortality Member kb:MortalityMember
3570 Appraisal cost ratio Member kb:AppraisalCostRatioMember
3571 Claim settlement ratio Member kb:ClaimSettlementRatioMember
3572 Rate of surrender value Member kb:RateOfSurrenderValueMember
3573 Range Axis [Axis] Axis ifrs-full:RangeAxis
3574 Ranges Member [Domain] Member ifrs-full:RangesMember
3575 Bottom Of Range Member [Member] Member ifrs-full:BottomOfRangeMember
3576 Top Of Range Member [Member] Member ifrs-full:TopOfRangeMember
3577 Assumptions And Basis For Insurance Liability Adequacy Test LineItems[Line Items] LineItems kb:AssumptionsAndBasisForInsuranceLiabilityAdequacyTestLineItems
3578 Assumptions(%) Concept (Percent) For Period kb:AssumptionsForInsuranceLiabilityAdequacyTest
3579 Basis Concept (Text/String) For Period kb:BasisForInsuranceLiabilityAdequacyTest
3580 24370302 - Disclosure - Insurance Contracts_The Results Of Liability Adequacy Test(Details) Network

*

*

 http://www.kbfg.com/role/InsuranceContractsTheResultsOfLiabilityAdequacyTestDetails
3581 Results OfI nsurance Liability Adequacy Test[Table] Table

*

*

 kb:ResultsOfInsuranceLiabilityAdequacyTestTable
3582 Types Of Insurance Contracts Axis [Axis] Axis ifrs-full:TypesOfInsuranceContractsAxis
3583 Insurance Contracts Member [Domain] Member ifrs-full:InsuranceContractsMember
3584 Non-life insurance Member ifrs-full:NonlifeInsuranceContractsMember
3585 General Insurance Member kb:GeneralInsuranceMember
3586 Automobile insurance Member kb:AutomobileInsuranceMember
3587 Long-term Insurance Member kb:LongTermInsuranceMember
3588 Life insurance Member ifrs-full:LifeInsuranceContractsMember
3589 Fixed interest type Participating Member kb:FixedInterestTypeParticipatingMember
3590 Fixed interest type Non-participating Member kb:FixedInterestTypeNonParticipatingMember
3591 Variable interest type Participating Member kb:VariableInterestTypeParticipatingMember
3592 Variable interest type Non-participating Member kb:VariableInterestTypeNonParticipatingMember
3593 Varibale type Member kb:VariableTypeMember
3594 Results Of Insurance Liability Adequacy Test LineItems [Line Items] LineItems kb:ResultsOfInsuranceLiabilityAdequacyTestLineItems
3595 Recognized liabilities Concept (Monetary) As Of Credit kb:RecognizedLiabilitiesForTheResultsOfLiabilityAdequacyTest
3596 Estimated adequate liabilities Concept (Monetary) As Of Credit kb:EstimatedLiabilitiesArisingFromInsuranceContracts
3597 Shortfall(surplus) Concept (Monetary) As Of Credit ifrs-full:ProvisionsArisingFromLiabilityAdequacyTests
3598 24370401 - Disclosure - Insurance Contracts_Insurance Income And Expenses(Details) Network

*

*

 http://www.kbfg.com/role/InsuranceContractsInsuranceIncomeAndExpensesDetails
3599 Implied Table Table

*

*

 implied:Table
3600 Disclosure Of Insurance Income And Expenses Abstract kb:DisclosureOfInsuranceIncomeAndExpenses
3601 Sub-total Concept (Monetary) For Period Credit ifrs-full:IncomeArisingFromInsuranceContracts
3602 Premium income Concept (Monetary) For Period Credit ifrs-full:RevenueFromInsuranceContractsIssuedWithoutReductionForReinsuranceHeld
3603 Reinsurance income Concept (Monetary) For Period Credit ifrs-full:IncomeFromContractsWithReinsurers
3604 Separate account income Concept (Monetary) For Period Credit us-gaap:GainRecognizedOnAssetsTransferredToSeparateAccountGross
3605 Income of change in reinsurance assets Concept (Monetary) For Period Credit kb:IncomeFromChangeInReinsuranceAssets
3606 Other insurance income Concept (Monetary) For Period Credit kb:OtherInsuranceIncome
3607 Sub-total Concept (Monetary) For Period Debit ifrs-full:ExpenseArisingFromInsuranceContracts
3608 Insurance claims paid Concept (Monetary) For Period Debit ifrs-full:ExpenseForPolicyholderClaimsAndBenefitsWithoutReductionForReinsuranceHeld
3609 Dividend expenses Concept (Monetary) For Period Debit kb:DividendExpensesFromInsuranceContracts
3610 Refunds of surrender value Concept (Monetary) For Period Debit kb:RefundsOfSurrenderValueFromInsuranceContracts
3611 Reinsurance expenses Concept (Monetary) For Period Debit ifrs-full:ExpensesArisingFromReinsuranceHeld
3612 Policy reserve appropriation Concept (Monetary) For Period Credit ifrs-full:ExpenseIncomeIncludedInProfitOrLossLiabilitiesUnderInsuranceContractsAndReinsuranceContractsIssued
3613 Separate account expenses Concept (Monetary) For Period Debit kb:SeparateAccountExpensesFromInsuranceContracts
3614 Insurance operating expenses Concept (Monetary) For Period Debit kb:InsuranceOperatingExpense
3615 Amortisation Deferred Acquisition Costs Arising From Insurance Contracts Concept (Monetary) For Period Credit ifrs-full:AmortisationDeferredAcquisitionCostsArisingFromInsuranceContracts
3616 Expenses of change in reinsurance assets Concept (Monetary) For Period Debit kb:ExpensesFromChangeInReinsuranceAssets
3617 Claim survey expenses paid Concept (Monetary) For Period Debit kb:ClaimSurveyExpensesPaid
3618 Other insurance expenses Concept (Monetary) For Period Debit kb:OtherInsuranceExpenses
3619 Net insurance income(expenses) Concept (Monetary) For Period Credit kb:NetInsuranceIncomeExpense
3620 24370501 - Disclosure - Insurance Contracts_Insurance Risk Management(Details) Network

*

*

 http://www.kbfg.com/role/InsuranceContractsInsuranceRiskManagement
3621 Disclosure Of Nature And Extent Of Risks Arising From Insurance Contracts[Table] Table

*

*

 kb:DisclosureOfNatureAndExtentOfRisksArisingFromInsuranceContractsTable
3622 Types Of Insurance Contracts Axis [Axis] Axis ifrs-full:TypesOfInsuranceContractsAxis
3623 Insurance Contracts Member [Domain] Member ifrs-full:InsuranceContractsMember
3624 Non-life insurance Member ifrs-full:NonlifeInsuranceContractsMember
3625 Life insurance Member ifrs-full:LifeInsuranceContractsMember
3626 Disclosure Of Nature And Extent Of Risks Arising FromInsuranceContracts LineItems[Line Items] LineItems kb:DisclosureOfNatureAndExtentOfRisksArisingFromInsuranceContractsLineItems
3627 Purposes, policies and procedures to manage risk arising from insurance contracts Concept (Text/String) For Period ifrs-full:DescriptionOfObjectivesPoliciesAndProcessesForManagingRisksArisingFromInsuranceContractsAndMethodsUsedToManageThoseRisks
3628 Purposes, policies and procedures to manage risk arising from insurance contracts Concept (Text/String) For Period ifrs-full:DescriptionOfConcentrationsOfInsuranceRisk
3629 24370502 - Disclosure - Insurance Contracts_Exposure To Non life Insurance Price Risk(Details) Network

*

*

 http://www.kbfg.com/role/InsuranceContractsExposureToNonlifeInsurancePriceRiskDetails
3630 Disclosure Of Non Life Insurance Price Risk[Table] Table

*

*

 kb:DisclosureOfNonLifeInsurancePriceRiskTable
3631 Types Of Insurance Contracts Axis [Axis] Axis ifrs-full:TypesOfInsuranceContractsAxis
3632 Insurance Contracts Member [Domain] Member ifrs-full:InsuranceContractsMember
3633 Non-life insurance Member ifrs-full:NonlifeInsuranceContractsMember
3634 General Insurance Member kb:GeneralInsuranceMember
3635 Automobile insurance Member kb:AutomobileInsuranceMember
3636 Long-term Insurance Member kb:LongTermInsuranceMember
3637 Disclosure Of Non Life Insurance Price Risk LineItems [Line Items] LineItems kb:DisclosureOfNonLifeInsurancePriceRiskLineItems
3638 Direct insurance Concept (Monetary) As Of Credit kb:MaxiumumExposureOfInsurancePriceRiskBeforeReinsurance
3639 Inward reinsurance Concept (Monetary) As Of Credit kb:MaxiumumExposureOfInsurancePriceRiskInwardReinsurance
3640 Outward reinsurance Concept (Monetary) As Of Credit kb:MaxiumumExposureOfInsurancePriceRiskOutwardReinsurance
3641 Total Concept (Monetary) As Of Credit kb:MaxiumumExposureOfInsurancePriceRiskAfterReinsurance
3642 24370503 - Disclosure - Insurance Contracts_Non life Loss Development Tables(Details) Network

*

*

 http://www.kbfg.com/role/InsuranceContractsNonlifeLossDevelopmentTablesDetails
3643 Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability Table[Table] Table

*

*

 us-gaap:ShortdurationInsuranceContractsReconciliationOfClaimsDevelopmentToLiabilityTable
3644 Types Of Insurance Contracts Axis [Axis] Axis ifrs-full:TypesOfInsuranceContractsAxis
3645 Insurance Contracts Member [Domain] Member ifrs-full:InsuranceContractsMember
3646 Non-life insurance Member ifrs-full:NonlifeInsuranceContractsMember
3647 General Insurance Member kb:GeneralInsuranceMember
3648 Automobile insurance Member kb:AutomobileInsuranceMember
3649 Long-term Insurance Member kb:LongTermInsuranceMember
3650 Shortduration Insurance Contracts Accident Year Axis[Axis] Axis us-gaap:ShortdurationInsuranceContractsAccidentYearAxis
3651 Accident year Member us-gaap:ShortdurationInsuranceContractsAccidentYearDomain
3652 2010.4.1 ~ 2011.3.31 Member us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member
3653 2011.4.1 ~ 2012.3.31 Member us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member
3654 2012.4.1 ~ 2013.3.31 Member us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member
3655 2013.4.1 ~ 2014.3.31 Member us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member
3656 2014.4.1 ~ 2015.3.31 Member us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member
3657 2015.4.1 ~ 2016.3.31 Member us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member
3658 2016.4.1 ~ 2017.3.31 Member us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member
3659 Shortduration Insuranc eContracts Claim Duration Axis[Axis] Axis us-gaap:ShortdurationInsuranceContractsClaimDurationAxis
3660 Payment year Member us-gaap:ShortdurationInsuranceContractsClaimDurationDomain
3661 After 1 year Member kb:ShortdurationInsuranceContractsClaimDurationAfter1YearMember
3662 After 2 year Member kb:ShortdurationInsuranceContractsClaimDurationAfter2YearMember
3663 After 3 year Member kb:ShortdurationInsuranceContractsClaimDurationAfter3YearMember
3664 After 4 year Member kb:ShortdurationInsuranceContractsClaimDurationAfter4YearMember
3665 After 5 year Member kb:ShortdurationInsuranceContractsClaimDurationAfter5YearMember
3666 After 6 year Member kb:ShortdurationInsuranceContractsClaimDurationAfter6YearMember
3667 After 7 year Member kb:ShortdurationInsuranceContractsClaimDurationAfter7YearMember
3668 Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability LineItems[Line Items] LineItems us-gaap:ShortdurationInsuranceContractsReconciliationOfClaimsDevelopmentToLiabilityLineItems
3669 Estimate of gross ultimate claims (A) Concept (Monetary) As Of Credit kb:ShortdurationInsuranceContractsEstimatedCumulativeClaimsAndAllocatedClaimAdjustmentExpenseNet
3670 Gross cumulative claim payments (B) Concept (Monetary) As Of Debit us-gaap:ShortdurationInsuranceContractsCumulativePaidClaimsAndAllocatedClaimAdjustmentExpenseNet
3671 Difference (A-B) Concept (Monetary) As Of Debit kb:ShortdurationInsuranceContractsDifferenceBetweenEsimatedCumulativeClaimsAndCumulativePaidClaims
3672 24370504 - Disclosure - Insurance Contracts_Sensitivity Analysis Of Non life Insurance Risk(Details) Network

*

*

 http://www.kbfg.com/role/InsuranceContractsSensitivityAnalysisOfNonlifeInsuranceRiskDetails
3673 Disclosure Of Sensitivity Analysis Of Non Life Insurance Risk[Table] Table

*

*

 kb:DisclosureOfSensitivityAnalysisOfNonLifeInsuranceRiskTable
3674 Types Of Insurance Contracts Axis [Axis] Axis ifrs-full:TypesOfInsuranceContractsAxis
3675 Total Member ifrs-full:InsuranceContractsMember
3676 Non-life insurance Member ifrs-full:NonlifeInsuranceContractsMember
3677 Type Of Assumptions For Insurance Liability Adequacy Test[Axis] Axis kb:TypeOfAssumptionsForInsuranceLiabilityAdequacyTestAxis
3678 Type Of Assumptions Member[Domain] Member kb:TypeOfAssumptionsMember
3679 Surrenders and termination rates Member kb:RateOfSurrenderValueMember
3680 Loss ratio Member kb:LossRatioMember
3681 Insurance operating expenses ratio Member kb:ExpenseRatioMember
3682 Discount rate Member kb:DiscountRateMember
3683 Range Axis [Axis] Axis ifrs-full:RangeAxis
3684 Ranges Member [Domain] Member ifrs-full:RangesMember
3685 Bottom Of Range Member [Member] Member ifrs-full:BottomOfRangeMember
3686 Top Of Range Member [Member] Member ifrs-full:TopOfRangeMember
3687 Disclosure Of Sensitivity Analysis Of Non Life Insurance Risk LineItems[Line Items] LineItems kb:DisclosureOfSensitivityAnalysisOfNonLifeInsuranceRiskLineItems
3688 Assumption change Concept (Percent) As Of kb:AssumptionsChangeForInsuranceLiabilityAdequacyTest
3689 2017 Effect on LAT Concept (Monetary) As Of Credit kb:EffectOnIsuranceLiabilityAdequacyTest
3690 24370505 - Disclosure - Insurance Contracts_Liquidity Risk Of Non life Insurance Contracts(Details) Network

*

*

 http://www.kbfg.com/role/InsuranceContractsLiquidityRiskOfNonlifeInsuranceContractsDetails
3691 Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity[Table] Table

*

*

 kb:DisclosureOfNonLifeInsurancePremiumReservesBasedOnEachResidualMaturityTable
3692 Maturity Axis [Axis] Axis ifrs-full:MaturityAxis
3693 Aggregated Time Bands Member [Domain] Member ifrs-full:AggregatedTimeBandsMember
3694 Within 1 year Member ifrs-full:NotLaterThanOneYearMember
3695 1~5 years Member ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember
3696 5~10 years Member ifrs-full:LaterThanFiveYearsAndNotLaterThanTenYearsMember
3697 10~20 years Member kb:LaterThanTenYearsAndNotLaterThanTwentyYearsMember
3698 More 20 years Member kb:LaterThanTwentyYearsMember
3699 Types Of Insurance Contracts Axis [Axis] Axis ifrs-full:TypesOfInsuranceContractsAxis
3700 Insurance Contracts Member [Domain] Member ifrs-full:InsuranceContractsMember
3701 Non-life insurance Member ifrs-full:NonlifeInsuranceContractsMember
3702 Long-term insurance non participating Member kb:LongTermInsuranceNonParticipatingMember
3703 Annuity Member kb:AnnuityInsuranceMember
3704 Asset-linked Member kb:AssetLinkedInsuranceMember
3705 Types Of Interest[Axis] Axis kb:TypesOfInterestAxis
3706 Type Of Interest Member[Domain] Member kb:TypeOfInterestMember
3707 Non-linked Member kb:NonLinkedInterestMember
3708 Linked Member kb:LinkedInterestMember
3709 Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity LineItems[Line Items] LineItems kb:DisclosureOfNonLifeInsurancePremiumReservesBasedOnEachResidualMaturityLineItems
3710 Premuim Reserves Concept (Monetary) As Of Credit kb:PremuimReserves
3711 24370506 - Disclosure - Insurance Contracts_Credit Risk Reinsurance Companies That Deal With The Group(Details) Network

*

*

 http://www.kbfg.com/role/InsuranceContractsCreditRiskReinsuranceCompaniesThatDealWithTheGroupDetails
3712 Ceded Credit Risk Table[Table] Table

*

*

 us-gaap:CededCreditRiskTable
3713 Types Of Insurance Contracts Axis [Axis] Axis ifrs-full:TypesOfInsuranceContractsAxis
3714 Insurance Contracts Member [Domain] Member ifrs-full:InsuranceContractsMember
3715 Non-life insurance Member ifrs-full:NonlifeInsuranceContractsMember
3716 Ceded Credit Risk Axis[Axis] Axis us-gaap:CededCreditRiskAxis
3717 Ceded Credit Risk Reinsurer Domain[Domain] Member us-gaap:CededCreditRiskReinsurerDomain
3718 KOREANRE Member kb:KOREANREMember
3719 SWISSREREINSURANCE Member kb:SWISSREMember
3720 HDIgerling Member kb:HDIgerlingMember
3721 Credit rating Axis us-gaap:CreditRatingStandardPoorsAxis
3722 External Credit Rating Standard Poors Member [Domain] Member us-gaap:ExternalCreditRatingStandardPoorsMember
3723 AA Member us-gaap:StandardPoorsAARatingMember
3724 AAA Member us-gaap:StandardPoorsAAARatingMember
3725 AA+ Member us-gaap:StandardPoorsAAPlusRatingMember
3726 Ceded Credit Risk LineItems[Line Items] LineItems us-gaap:CededCreditRiskLineItems
3727 Ratio Concept (Percent) For Period us-gaap:ConcentrationRiskPercentage1
3728 Reinsuance assets Concept (Monetary) As Of Debit kb:NonLifeReinsuranceAssetsWithoutImpairmnetLoss
3729 Net receivables from reinsurers Concept (Monetary) As Of Debit us-gaap:ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments
3730 Total Concept (Monetary) As Of Debit us-gaap:ReinsuranceRecoverables
3731 24370507 - Disclosure - Insurance Contracts_Exposure To Interest Rate Risk(Details) Network

*

*

 http://www.kbfg.com/role/InsuranceContractsExposureToInterestRateRiskDetails
3732 Disclosure Of Interest Risk Of Non Life Insurance Contract [Table] Table

*

*

 kb:DisclosureOfInterestRiskOfNonLifeInsuranceContractTable
3733 Types Of Insurance Contracts Axis [Axis] Axis ifrs-full:TypesOfInsuranceContractsAxis
3734 Total Member ifrs-full:InsuranceContractsMember
3735 Non-life insurance Member ifrs-full:NonlifeInsuranceContractsMember
3736 Balance Sheet Location Axis [Axis] Axis us-gaap:BalanceSheetLocationAxis
3737 Balance Sheet Location Domain [Domain] Member us-gaap:BalanceSheetLocationDomain
3738 Financial assets Member ifrs-full:FinancialAssetsMember
3739 Due from banks Member kb:CashAndDueFromFinancialInstitutionMember
3740 Financial assets at fair value through profit or loss Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember
3741 Available-for-sale financial assets Member ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
3742 Held-to-maturity financial assets Member ifrs-full:HeldtomaturityInvestmentsCategoryMember
3743 Loans Member ifrs-full:LoansAndReceivablesCategoryMember
3744 Financial liabilities Member kb:OtherFinancialLiabilitiesMember
3745 Fixed interest rate Member ifrs-full:FixedInterestRateMember
3746 Variable interest rate Member ifrs-full:FloatingInterestRateMember
3747 Disclosure Of Interest Risk Of Non Life Insurance Contract LineItems[Line Items] LineItems kb:DisclosureOfInterestRiskOfNonLifeInsuranceContractLineItems
3748 Exposure To Interest Rate Risk Concept (Monetary) For Period Credit kb:ExposureToInterestRateRisk
3749 24370601 - Disclosure - Insurance Contracts_The Maximum Exposures To Insurance Price Risk(Details Network

*

*

 http://www.kbfg.com/role/InsuranceContractsTheMaximumExposuresToInsurancePriceRiskDetails
3750 Details Of Maximum Exposure Of Insurance Price Risk Table [Table] Table

*

*

 kb:DetailsOfMaximumExposureOfInsurancePriceRiskTable
3751 Types Of Insurance Contracts Axis [Axis] Axis ifrs-full:TypesOfInsuranceContractsAxis
3752 Insurance Contracts Member [Domain] Member ifrs-full:InsuranceContractsMember
3753 Non-life insurance Member ifrs-full:NonlifeInsuranceContractsMember
3754 Death Member kb:MortalityMember
3755 Disability Member us-gaap:DisabilityInsurancePolicyMember
3756 Hospitalization Member kb:HospitalizationMember
3757 Operation and diagnosis Member kb:OperationAndDiagnosisMember
3758 Actual losses for medical expense Member us-gaap:AccidentAndHealthInsuranceSegmentMember
3759 Others Member kb:OthersMember
3760 Details Of Maximum Exposureof Insurance Price Risk Line Items [Line Items] LineItems kb:DetailsOfMaximumExposureofInsurancePriceRiskLineItems
3761 Before reinsurance mitigation Concept (Monetary) As Of Credit kb:MaxiumumExposureOfInsurancePriceRiskBeforeReinsuranceMitigation
3762 After reinsurance mitigation Concept (Monetary) As Of Credit kb:MaxiumumExposureOfInsurancePriceRiskAfterReinsuranceMitigation
3763 Average Ratios Of Insurance Claims Paid Per Risk Premium Received OnThe Basis Of Exposure Before Mitigation Concept (Percent) As Of kb:AverageRatiosOfInsuranceClaimsPaidPerRiskPremiumReceivedOnTheBasisOfExposureBeforeMitigation
3764 24370602 - Disclosure - Insurance Contracts_The Exposure Of Market Risk Arising From Embedded Derivatives Included In Host Insurance Contracts(Details) Network

*

*

 http://www.kbfg.com/role/InsuranceContractsTheExposureOfMarketRiskArisingFromEmbeddedDerivativesIncludedInHostInsuranceContractsDetails
3765 Details Of Exposure Of Market Risk Arising From Embeded Derivatives Included In Host Insurance Contracts Table [Table] Table

*

*

 kb:DetailsOfExposureOfMarketRiskArisingFromEmbededDerivativesIncludedInHostInsuranceContractsTable
3766 Types Of Insurance Contracts Axis [Axis] Axis ifrs-full:TypesOfInsuranceContractsAxis
3767 Insurance Contracts Member [Domain] Member ifrs-full:InsuranceContractsMember
3768 Life insurance Member ifrs-full:LifeInsuranceContractsMember
3769 Variable Life Member [Member] Member us-gaap:VariableLifeMember
3770 Variable annuity Member us-gaap:VariableAnnuityMember
3771 Variable universal Member us-gaap:UniversalLifeMember
3772 Variable saving Member kb:VariableSavingMember
3773 Details Of Exposure Of Market Risk Arising From Embeded Derivatives Included In Host Insurance Contracts Line Items [Line Items] LineItems kb:DetailsOfExposureOfMarketRiskArisingFromEmbededDerivativesIncludedInHostInsuranceContractsLineItems
3774 Policyholders reserve Concept (Monetary) As Of Credit kb:PolicyholdersReserveFromEmbededDerivativesIncludedInHostInsuranceContracts
3775 Guarantee reserve Concept (Monetary) As Of Credit kb:GuaranteeReserveFromEmbededDerivativesIncludedInHostInsuranceContracts
3776 24370603 - Disclosure - Insurance Contracts_Life Insurance Premium Reserves And Unearned Premium Reserves Residual Maturitys(Details) Network

*

*

 http://www.kbfg.com/role/InsuranceContractsLifeInsurancePremiumReservesAndUnearnedPremiumReservesResidualMaturitysDetails
3777 Description Of Life Insurance Premium Reserves And Unearned Premium Reserves Classified Based On Each Residual MaturityTable [Table] Table

*

*

 kb:DescriptionOfLifeInsurancePremiumReservesAndUnearnedPremiumReservesClassifiedBasedOnEachResidualMaturityTable
3778 Types Of Insurance Contracts Axis [Axis] Axis ifrs-full:TypesOfInsuranceContractsAxis
3779 Insurance Contracts Member [Domain] Member ifrs-full:InsuranceContractsMember
3780 Life insurance Member ifrs-full:LifeInsuranceContractsMember
3781 Maturity Axis [Axis] Axis ifrs-full:MaturityAxis
3782 Aggregated Time Bands Member [Domain] Member ifrs-full:AggregatedTimeBandsMember
3783 Less than 3 years Member kb:LessThanThreeYearsMember
3784 3-5 years Member ifrs-full:LaterThanThreeYearsAndNotLaterThanFiveYearsMember
3785 5~10 years Member ifrs-full:LaterThanFiveYearsAndNotLaterThanTenYearsMember
3786 10-15 years Member ifrs-full:LaterThanTenYearsAndNotLaterThanFifteenYearsMember
3787 15-20 years Member ifrs-full:LaterThanFifteenYearsAndNotLaterThanTwentyYearsMember
3788 More 20 years Member kb:LaterThanTwentyYearsMember
3789 Description Of Life Insurance Premium Reserves And Unearned Premium Reserves Classified Based On Each Residual Maturity LineItems[Line Items] LineItems kb:DescriptionOfLifeInsurancePremiumReservesAndUnearnedPremiumReservesClassifiedBasedOnEachResidualMaturityLineItems
3790 Premium reserves Concept (Monetary) As Of Credit kb:PremuimReserves
3791 Unearned premium reserves Concept (Monetary) As Of Credit kb:UnearnedPremiumReserves
3792 24380101 - Disclosure - Supplemental Cash Flow Information_Cash And Cash Equivalents(Details) Network

*

*

 http://www.kbfg.com/role/SupplementalCashFlowInformationCashAndCashEquivalentsDetails
3793 Implied Table Table

*

*

 implied:Table
3794 Cash And Cash Equivalents If Different From Statement Of Financial Position Abstract [Abstract] Abstract ifrs-full:CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPositionAbstract
3795 Cash Concept (Monetary) As Of Debit ifrs-full:Cash
3796 Checks with other banks Concept (Monetary) As Of Debit kb:ChecksWithOtherBanks
3797 Due from Bank of Korea Concept (Monetary) As Of Debit ifrs-full:BankBalancesAtCentralBanksOtherThanMandatoryReserveDeposits
3798 Due from other financial institutions Concept (Monetary) As Of Debit kb:DueFromOtherFinancialInstitutions
3799 Sub-total Concept (Monetary) As Of Debit us-gaap:CashAndDueFromBanks
3800 Restricted cash from financial institutions Concept (Monetary) As Of Debit kb:RestrictedDueFromFinancailInstitutions
3801 Due from financial institutions with original maturities over three monthes Concept (Monetary) As Of Credit ifrs-full:OtherDifferencesToCashAndCashEquivalentsInStatementOfCashFlows
3802 Sub-total Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition
3803 Total Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
3804 24380102 - Disclosure - Supplemental Cash Flow Information_Significant Noncash Transactions(Details) Network

*

*

 http://www.kbfg.com/role/SupplementalCashFlowInformationSignificantNoncashTransactionsDetails
3805 Implied Table Table

*

*

 implied:Table
3806 Significant Non Cash Transactions Abstract [Abstract] Abstract kb:SignificantNonCashTransactionsAbstract
3807 Decrease in loans due to the write-offs Concept (Monetary) For Period Debit kb:DecreaseInLoansDueToTheWriteOffsNonCashFlow
3808 Changes in accumulated other comprehensive income due to valuation of financial investments Concept (Monetary) For Period Debit kb:ChangesInAccumulatedOtherComprehensiveIncomeDueToValuationOfFinancialInvestmentsNonCashFlow
3809 Decrease in accumulated other comprehensive income from measurement of investment securities in associates Concept (Monetary) For Period Debit kb:ChangesInAccumulatedOtherComprehensiveIncomeFromMeasurementOfInvestmentSecuritiesInAssociatesNonCashFlow
3810 Change in shares of investment in associate due to KB Insurance Co., Ltd.’s inclusion of the consolidation scope Concept (Monetary) For Period Debit kb:ChangeInSharesOfInvestmentInAssociateDueToKbInsuranceCoLtdsInclusionOfTheConsolidationScopeNonCashFlow
3811 Change in shares of investment in associate due to Hyundai Securities Co., Ltd.’s inclusion of the consolidation scope Concept (Monetary) For Period Debit kb:ChangeInSharesOfInvestmentInAssociateDueToHyundaiSecuritiesCoLtdsInclusionOfTheConsolidationScopeNonCashFlow
3812 Increase in financial investments due to debt-for-equity swap with Taihan Electric Wire Co., Ltd. Concept (Monetary) For Period Debit kb:IncreaseInFinancialInvestmentsDueToDebtForEquitySwapWithTaihanElectricWireCoLtdNonCashFlow
3813 24380103 - Disclosure - Supplemental Cash Flow Information_Cash Inflows And Outflows From Income Tax Interests And Dividends(Details) Network

*

*

 http://www.kbfg.com/role/SupplementalCashFlowInformationCashInflowsAndOutflowsFromIncomeTax,InterestsAndDividendsDetails
3814 Implied Table Table

*

*

 implied:Table
3815 Cash Inflows And Outflows From Income Tax Interests And Dividends Abstract [Abstract] Abstract kb:CashInflowsAndOutflowsFromIncomeTaxInterestsAndDividendsAbstract
3816 Income Taxes Paid Refund Classified As Operating Activities Concept (Monetary) For Period Credit ifrs-full:IncomeTaxesPaidRefundClassifiedAsOperatingActivities
3817 Interest Received Classified As Operating Activities Concept (Monetary) For Period Debit ifrs-full:InterestReceivedClassifiedAsOperatingActivities
3818 Interest Paid Classified As Operating Activities Concept (Monetary) For Period Credit ifrs-full:InterestPaidClassifiedAsOperatingActivities
3819 Dividends Received Classified As Operating Activities Concept (Monetary) For Period Debit ifrs-full:DividendsReceivedClassifiedAsOperatingActivities
3820 Dividends Paid Classified As Financing Activities Concept (Monetary) For Period Credit ifrs-full:DividendsPaidClassifiedAsFinancingActivities
3821 24380104 - Disclosure - Supplemental Cash Flow Information_Changes In Liabilities Arising From Financing Activities(Details) Network

*

*

 http://www.kbfg.com/role/SupplementalCashFlowInformationChangesInLiabilitiesArisingFromFinancingActivitiesDetails
3822 Disclosure of reconciliation of liabilities arising from financing activities [Table] Table

*

*

 ifrs-full:DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesTable
3823 Liabilities arising from financing activities [Axis] Axis ifrs-full:LiabilitiesArisingFromFinancingActivitiesAxis
3824 Liabilities arising from financing activities [Domain] Member ifrs-full:LiabilitiesArisingFromFinancingActivitiesMember
3825 Net derivatives liabilities held for hedging after offsetting liabilities from assets arising from financing activities [Member] Member kb:NetDerivativesLiabilitiesHeldForHedgingAfterOffsettingLiabilitiesFromAssetsArisingFromFinancingActivitiesMember
3826 Debts Member kb:DebtsMember
3827 Debentures Member kb:DebenturesMember
3828 Other payables from trust accounts arising from financing activities [Member] Member kb:OtherPayablesFromTrustAccountsArisingFromFinancingActivitiesMember
3829 Other liabilities arising from financing activities [Member] Member kb:OtherLiabilitiesArisingFromFinancingActivitiesMember
3830 Disclosure of reconciliation of liabilities arising from financing activities [Line Items] LineItems ifrs-full:DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesLineItems
3831 Beginning Concept (Monetary) As Of Credit ifrs-full:LiabilitiesArisingFromFinancingActivities
3832 Changes in liabilities arising from financing activities [Abstract] Abstract ifrs-full:ChangesInLiabilitiesArisingFromFinancingActivitiesAbstract
3833 Increase decrease through financing cash flows liabilities arising from financing activities Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughFinancingCashFlowsLiabilitiesArisingFromFinancingActivities
3834 Noncash changes in liabilities arising from financing activities [Abstract] Abstract kb:NoncashChangesInLiabilitiesArisingFromFinancingActivitiesAbstract
3835 Increase decrease through acquisition or disposal liabilities arising from financing activities Concept (Monetary) For Period Credit kb:IncreaseDecreaseThroughAcquisitionorDisposalLiabilitiesArisingFromFinancingActivities
3836 Increase decrease through effect of changes in foreign exchange rates liabilities arising from financing activities Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughEffectOfChangesInForeignExchangeRatesLiabilitiesArisingFromFinancingActivities
3837 Increase decrease through changes in fair values liabilities arising from financing activities Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughChangesInFairValuesLiabilitiesArisingFromFinancingActivities
3838 Increase decrease through obtaining or losing control of subsidiaries or other businesses liabilities arising from financing activities Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughObtainingOrLosingControlOfSubsidiariesOrOtherBusinessesLiabilitiesArisingFromFinancingActivities
3839 Increase decrease through other changes liabilities arising from financing activities Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughOtherChangesLiabilitiesArisingFromFinancingActivities
3840 Ending Concept (Monetary) As Of Credit ifrs-full:LiabilitiesArisingFromFinancingActivities
3841 Cash Flows Used In Obtaining Control Of Subsidiaries Or Other Businesses Classified As Investing Activities Concept (Monetary) For Period Credit ifrs-full:CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities
3842 Cash flows used in obtaining control of kb insurance classified as investing activities Concept (Monetary) For Period Credit kb:CashFlowsUsedInObtainingControlOfKbInsuranceClassifiedAsInvestingActivities
3843 24390101 - Disclosure - Contingent Liabilities and Commitments_Details Of Payment Guarantees(Details) Network

*

*

 http://www.kbfg.com/role/ContingentLiabilitiesAndCommitmentsDetailsOfPaymentGuaranteesDetails
3844 Disclosure Of Contingent Liabilities Table [Table] Table

*

*

 ifrs-full:DisclosureOfContingentLiabilitiesTable
3845 Classes Of Contingent Liabilities Axis [Axis] Axis ifrs-full:ClassesOfContingentLiabilitiesAxis
3846 Contingent Liabilities Member [Domain] Member ifrs-full:ContingentLiabilitiesMember
3847 Contingent Liability For Guarantees Member [Member] Member ifrs-full:ContingentLiabilityForGuaranteesMember
3848 Confirmed payment guarantees Member kb:ConfirmedPaymentGuaranteesMember
3849 Confirmed payment guarantees in Korean won Member kb:ConfirmedPaymentGuaranteesInKoreanWonMember
3850 Payment guarantees for KB purchasing loan Member kb:PaymentGuaranteesForPurchasingLoanMember
3851 Other payment guarantees Member kb:OtherPaymentGuaranteesMember
3852 Confirmed payment guarantees in foreign currency Member kb:ConfirmedPaymentGuaranteesInForeignCurrencyMember
3853 Acceptances of letter of credit Member kb:AcceptancesOfLetterOfCreditMember
3854 Letter of guarantees Member kb:LetterOfGuaranteesMember
3855 BidBondMember Member kb:BidBondMember
3856 Performance bond Member kb:PerformanceBondMember
3857 Refund guarantees Member kb:RefundGuaranteesMember
3858 Other payment guarantees in foreign currency Member kb:OtherPaymentGuaranteesInForeignCurrencyMember
3859 Financail guarantees Member kb:FinancialGuaranteesMember
3860 Guarantees for Debenture-Issuing Member kb:GuaranteesForDebentureIssuingMember
3861 Payment guarantees for mortgage Member kb:PaymentGuaranteesForMortgageMember
3862 Overseas debt guarantees Member kb:OverseasDebtGuaranteesMember
3863 International financing guarantees in foreign currencies Member kb:InternationalFinancingGuaranteesInForeignCurrenciesMember
3864 Other financing payment guarantees Member kb:OtherFinancingPaymentGuaranteesMember
3865 Unconfirmed acceptances and guarantees Member kb:UnconfirmedAcceptancesAndGuaranteesMember
3866 Guarantees of letter of credit Member kb:GuaranteesOfLetterOfCreditMember
3867 Refund guarantees Member kb:UnconfirmedRefundGuaranteesMember
3868 Contingent Liability For Commitments Member [Member] Member kb:ContingentLiabilityForCommitmentsMember
3869 Commitments Member us-gaap:CommitmentsMember
3870 Corporate loan commitments Member kb:CorporateLoanCommitmentsMember
3871 Retail loan commitments Member kb:RetailLoanCommitmentsMember
3872 Credit line on credit cards Member kb:CreditLineOnCreditCardsMember
3873 Purchase of other security investment and others Member kb:PurchaseOfOtherSecurityInvestmentAndOthersMember
3874 Financial Guarantees Member kb:FinancialGuaranteesCommitmentsMember
3875 Credit line Member kb:CreditLineMember
3876 Purchase of security investment Member kb:PurchaseOfSecurityInvestmentMember
3877 Legal Proceedings Contingent Liability Member [Member] Member ifrs-full:LegalProceedingsContingentLiabilityMember
3878 Law Suits As Plaintiff In The Normal Course Of The Business Member [Member] Member kb:LawSuitsAsPlaintiffInTheNormalCourseOfTheBusinessMember
3879 Law Suits As Defendant In The Normal Course Of The Business Member [Member] Member kb:LawSuitsAsDefendantInTheNormalCourseOfTheBusinessMember
3880 Construction Contracts Related To Headquarter Building Member[Member] Member kb:ConstructionContractsRelatedToHeadquarterBuildingMember
3881 Construction Contracts Related To It Center Member[Member] Member kb:ConstructionContractsRelatedToItCenterMember
3882 Law Suits Cyber Incident Member [Member] Member kb:LawSuitsCyberIncidentMember
3883 Disclosure Of Contingent Liabilities Line Items [Line Items] LineItems ifrs-full:DisclosureOfContingentLiabilitiesLineItems
3884 Explanation Of Financial Effect Of Contingent Liabilities Concept (Text/String) For Period ifrs-full:ExplanationOfFinancialEffectOfContingentLiabilities
3885 Estimated Financial Effect Of Contingent Liabilities Concept (Monetary) As Of ifrs-full:EstimatedFinancialEffectOfContingentLiabilities
3886 Contingent Liability For Commitments Concept (Monetary) As Of Credit kb:ContingentLiabilityForCommitments
3887 Loss Contingency Pending Claims Number Concept (Integer) As Of us-gaap:LossContingencyPendingClaimsNumber
3888 Loss Contingency Damages Sought Value Concept (Monetary) For Period Debit us-gaap:LossContingencyDamagesSoughtValue
3889 Estimated Financial Effect Of Contingent Assets Concept (Monetary) As Of ifrs-full:EstimatedFinancialEffectOfContingentAssets
3890 Loss Contingency Accrual At Carrying Value Concept (Monetary) As Of Credit us-gaap:LossContingencyAccrualAtCarryingValue
3891 Contractual Commitments For Acquisition Of Property Plant And Equipment Concept (Monetary) As Of Credit ifrs-full:ContractualCommitmentsForAcquisitionOfPropertyPlantAndEquipment
3892 Explanation Of Possibility Of Reimbursement Contingent Liabilities Concept (Text/String) For Period ifrs-full:ExplanationOfPossibilityOfReimbursementContingentLiabilities
3893 The Face Value Of The Securities Which The Group Sold To General Customers Through The Bank Tellers Concept (Monetary) As Of Debit kb:TheFaceValueOfTheSecuritiesWhichTheGroupSoldToGeneralCustomersThroughTheBankTellers
3894 24390102 - Disclosure - Contingent Liabilities and Commitments_Acceptances And Guarantees By Counterparty(Details) Network

*

*

 http://www.kbfg.com/role/ContingentLiabilitiesAndCommitmentsAcceptancesAndGuaranteesByCounterpartyDetails
3895 Acceptances And Guarantees By Counterparty Table [Table] Table

*

*

 kb:AcceptancesAndGuaranteesByCounterpartyTable
3896 Counterparties Axis [Axis] Axis ifrs-full:CounterpartiesAxis
3897 Counterparties Member [Domain] Member ifrs-full:CounterpartiesMember
3898 Corporations Member kb:CorporationsMember
3899 Small companies Member kb:SmallCompaniesMember
3900 Public and others Member kb:PublicAndOthersMember
3901 Acceptances And Guarantees By Counterparty Line Items [Line Items] LineItems kb:AcceptancesAndGuaranteesByCounterpartyLineItems
3902 Confirmed guarantees Concept (Monetary) As Of Credit kb:ContingentLiabilityForConfirmedPaymentGuarantees
3903 Unconfirmed guarantees Concept (Monetary) As Of Credit kb:ContingentLiabilityForUnconfirmedPaymentGuarantees
3904 Total Concept (Monetary) As Of Credit kb:ContingentLiabilityForGuarantees
3905 Proportion (%) Concept (Percent) As Of kb:ProportionOfContingentLiabilityForGuaranteesByCounterparty
3906 24390103 - Disclosure - Contingent Liabilities and Commitments_Acceptances And Guarantees By Industry(Details) Network

*

*

 http://www.kbfg.com/role/ContingentLiabilitiesAndCommitmentsAcceptancesAndGuaranteesByIndustryDetails
3907 Acceptances And Guarantees By Industry Table [Table] Table

*

*

 kb:AcceptancesAndGuaranteesByIndustryTable
3908 Products And Services Axis [Axis] Axis ifrs-full:ProductsAndServicesAxis
3909 Products And Services Member [Domain] Member ifrs-full:ProductsAndServicesMember
3910 Financial institutions Member kb:FinancialInstitutionsMember
3911 Manufacturing Member kb:ManufacturingMember
3912 Service Member kb:ServiceMember
3913 Wholesale & Retail Member kb:WholesaleNRetailMember
3914 Construction Member kb:ConstructionMember
3915 Public sector Member kb:PublicSectorMember
3916 Others Member kb:OtherIndustriesMember
3917 Acceptances And Guarantees By Counterparty Line Items [Line Items] LineItems kb:AcceptancesAndGuaranteesByCounterpartyLineItems
3918 Confirmed guarantees Concept (Monetary) As Of Credit kb:ContingentLiabilityForConfirmedPaymentGuarantees
3919 Unconfirmed guarantees Concept (Monetary) As Of Credit kb:ContingentLiabilityForUnconfirmedPaymentGuarantees
3920 Total Concept (Monetary) As Of Credit kb:ContingentLiabilityForGuarantees
3921 Proportion (%) Concept (Percent) As Of kb:ProportionOfContingentLiabilityForGuaranteesByIndustry
3922 24400101 - Disclosure - Subsidiaries_Details Of Subsidiaries(Details) Network

*

*

 http://www.kbfg.com/role/SubsidiariesDetailsOfSubsidiariesDetails
3923 Disclosure Of Significant Investments In Subsidiaries Table [Table] Table

*

*

 ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesTable
3924 Significant Investments In Subsidiaries Axis [Axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
3925 Entitys Total For Subsidiaries Member [Domain] Member ifrs-full:EntitysTotalForSubsidiariesMember
3926 Kookmin Bank Member kb:KookminBankMember
3927 KB Securities Co., Ltd. Member kb:KBSecuritiesCoLtdMember
3928 KB Insurance Co., Ltd. Member kb:KBInsuranceCoLtdMember
3929 KB Kookmin Card Co., Ltd. Member kb:KBKookminCardCoLtdMember
3930 KB Life Insurance Co., Ltd. Member kb:KBLifeInsuranceCoLtdMember
3931 KB Asset Management Co., Ltd. Member kb:KBAssetManagementCoLtdMember
3932 KB Capital Co.,Ltd. Member kb:KBCapitalCoLtdMember
3933 KB Savings Bank Co., Ltd. Member kb:KBSavingsBankCoLtdMember
3934 KB Real Estate Trust Co., Ltd. Member kb:KBRealEstateTrustCoLtdMember
3935 KB Investment Co., Ltd. Member kb:KBInvestmentCoLtdMember
3936 KB Credit Information Co., Ltd. Member kb:KBCreditInformationCoLtdMember
3937 KB Data System Co., Ltd. Member kb:KBDataSystemCoLtdMember
3938 Kookmin Bank Int'l Ltd.(London) Member kb:KookminBankIntlLtdLondonMember
3939 Kookmin Bank Hong Kong Ltd. Member kb:KookminBankHongKongLtdMember
3940 Kookmin Bank Cambodia PLC. Member kb:KookminBankCambodiaPLCMember
3941 Kookmin Bank (China) Ltd. Member kb:KookminBankChinaLtdMember
3942 KB Microfinance Myanmer Co., Ltd. Member kb:KBMicrofinanceMyanmerCoLtdMember
3943 KBFG Securities America Inc. Member kb:KBFGSecuritiesAmericaIncMember
3944 KBFG Securities Hong Kong Ltd. Member kb:KBSecuritiesHongKongLtdMember
3945 KB SECURITEIS VIETNAM JOINT STOCK COMPANY Member kb:KBSECURITIESVIETNAMJOINTSTOCKCOMPANYMember
3946 KB Claims Survey & Adjusting Member kb:KBClaimsSurveyAndAdjustingMember
3947 KB Sonbo CNS Member kb:KBSonboCNSMember
3948 Leading Insurance Services, Inc. Member kb:LeadingInsuranceServicesIncMember
3949 LIG Insurance (China) Co., Ltd. Member kb:LIGInsuranceChinaCoLtdMember
3950 PT. KB Insurance Indonesia Member kb:PTKBInsuranceIndonesiaMember
3951 KB Golden Life Care Co., Ltd. Member kb:KBGoldenLifeCareCoLtdMember
3952 KB KOLAO LEASING Co., Ltd. Member kb:KBKOLAOLEASINGCoLtdMember
3953 KL 1st Inc. and 27 others Member kb:KL1stIncAnd27OthersMember
3954 KB Kookmin Card Third Securitization Co., Ltd., and 9 others Member kb:KBKookminCardThirdSecuritizationCoLtdAnd9OthersMember
3955 MS Sejong 4th Co., Ltd. and 43 others Member kb:MSSejong4thCoLtdAnd43OthersMember
3956 KB12-1 Venture Investment Member kb:KB121VentureInvestmentMember
3957 KB Start-up Creation Fund Member kb:KBStartupCreationFundMember
3958 09-5 KB Venture Fund Member kb:KB095VentureFundMember
3959 KoFC-KB Pioneer Champ No.2010-8 Investment Partnership Member kb:KoFCKBPioneerChampNo20108InvestmentPartnershipMember
3960 2011 KIF-KB IT Venture Fund Member kb:KIFKBIT2011VentureFundMember
3961 KoFC-KB Young Pioneer 1st Fund Member kb:KoFCKBYoungPioneer1stFundMember
3962 KB Intellectual Property Fund Member kb:KBIntellectualPropertyFundMember
3963 KB High-tech Company Investment Fund Member kb:KBHightechCompanyInvestmentFundMember
3964 KB KONEX Market Vitalization Fund Member kb:KBKONEXMarketVitalizationFundMember
3965 KB Neo Paradigm Agriculture Venture Fund Member kb:KBNeoParadigmAgricultureVentureFundMember
3966 KB NEW CONTENTS Venture Fund Member kb:KBNEWCONTENTSVentureFundMember
3967 KB Young Pioneer 3.0 Venture Fund Member kb:KBYoungPioneer3VentureFundMember
3968 KB Haeoreum Private Securities Investment Trust 1st and 3 others Member kb:KBHaeoreumPrivateSecuritiesInvestmentTrust1stAnd3OthersMember
3969 KB Multi-Asset Private Securities Fund (Bond Mixed-ETF) Member kb:KBMultiAssetPrivateSecuritiesFundBondMixedETFMember
3970 Member kb:GlobalDiversifiedMulti-AssetSub-TrustClassIAMember
3971 KB Multi-Asset Private Securities Fund S-1(Bond Mixed) Member kb:KBMultiAssetPrivateSecuritiesFundS1BondMixedMember
3972 KB Multi-Asset Private Securities Fund P-1(Bond Mixed) Member kb:KBMultiAssetPrivateSecuritiesFundP1BondMixedMember
3973 KB Multi-Asset Private Securities Master Fund P-1(Bond Mixed) Member kb:KBMultiAssetPrivateSecuritiesMasterFundP1BondMixedMember
3974 KB Wise Star Private Real Estate Feeder Fund 1st. Member kb:KBWiseStarPrivateRealEstateFeederFund1stMember
3975 KB Star Retail Private Master Real Estate Member kb:KBStarRetailPrivateMasterRealEstateMember
3976 KB Star Office Private Real Estate Investment Trust 2nd Member kb:KBStarOfficePrivateRealEstateInvestmentTrust2ndMember
3977 Hanbando BTL Private Special Asset Fund 1st Member kb:HanbandoBTLPrivateSpecialAssetFund1stMember
3978 KB Hope Sharing BTL Private Special Asset Member kb:KBHopeSharingBTLPrivateSpecialAssetMember
3979 KB Mezzanine Private Securities Fund 2nd.(Mixed) Member kb:KBMezzaninePrivateSecuritiesFund2ndMixedMember
3980 KB Senior Loan Private Fund Member kb:KBSeniorLoanPrivateFundMember
3981 KB Vintage 16 Private Securities Investment Trust 1st Member kb:KBVintage16PrivateSecuritiesInvestmentTrust1stMember
3982 Heungkuk Life Insurance Money Market Trust Member kb:HeungkukLifeInsuranceMoneyMarketTrustMember
3983 KB Haeoreum private securities investment trust 70(Bond) Member kb:KBHaeoreumPrivateSecuritiesInvestmentTrust70BondMember
3984 KB AMP Infra Private Special Asset Fund 1(FoFs) Member kb:KBAMPInfraPrivateSpecialAssetFund1FoFsMember
3985 KB-Solidus Global Healthcare Fund Member kb:KB-SolidusGlobalHealthcareFundMember
3986 KB KBSTAR Short Term KTB Active ETF Member kb:KBKBSTARShortTermKTBActiveETFMember
3987 KB KBSTAR Mid-Long Term KTB Active ETF Member kb:KBKBSTARMid-LongTermKTBActiveETFMember
3988 Samsung KODEX 10Y F-LKTB Inverse ETF(Bond-Derivatives) Member kb:SamsungKODEX10YF-LKTBInverseETFBond-DerivativesMember
3989 KB Haeoreum private securities investment trust 83(Bond) Member kb:KBHaeoreumPrivateSecuritiesInvestmentTrust83BondMember
3990 KB KBSTAR KTB 3Y Futures Inverse ETF Member kb:KBKBSTARKTB3YFuturesInverseETFMember
3991 KB Muni bond Private Securities Fund 1(USD)(bond) Member kb:KBMuniBondPrivateSecuritiesFund1USDBondMember
3992 Jueun Power Middle 7 and 7 others Member kb:JueunPowerMiddle7And7OthersMember
3993 Hyundai You First Private Real Estate Investment Trust No. 1 Member kb:HyundaiYouFirstPrivateRealEstateInvestmentTrustNo1Member
3994 Hyundai Smart Index Alpha Securities Feeder Investment Trust No.1 Member kb:HyundaiSmartIndexAlphaSecuritiesFeederInvestmentTrustNo1Member
3995 Hyundai Strong Korea Equity Trust No.1 Member kb:HyundaiStrongKoreaEquityTrustNo1Member
3996 Hyundai Kidzania Equity Feeder Trust No.1 Member kb:HyundaiKidzaniaEquityFeederTrustNo1Member
3997 Hyundai Value Plus Equity Feeder Trust No.1 Member kb:HyundaiValuePlusEquityFeederTrustNo1Member
3998 Hyundai Strong-small Corporate Trust No.1 Member kb:HyundaiStrongsmallCorporateTrustNo1Member
3999 Hyundai You First Private Real Estate Investment Trust No. 15 Member kb:HyundaiYouFirstPrivateRealEstateInvestmentTrustNo15Member
4000 JB New Jersey Private Real Estate Investment Trust No. 1 Member kb:JBNewJerseyPrivateRealEstateInvestmentTrustNo1Member
4001 Hyundai Dynamic Mix Secruticies Feeder Investment Trust No.1 Member kb:HyundaiDynamicMixSecruticiesFeederInvestmentTrustNo1Member
4002 Hyudai China Index Plus Securities Investment Trust No.1 Member kb:HyudaiChinaIndexPlusSecuritiesInvestmentTrustNo1Member
4003 Hyundai Kon-tiki Specialized Privately Placed Fund No.1 Member kb:HyundaiKon-tikiSpecializedPrivatelyPlacedFundNo1Member
4004 DGB Private real estate Investment Trust No.8 Member kb:DGBPrivateRealEstateInvestmentTrustNo8Member
4005 LIME GLOBALEYE ALP PRIVATE EQUITY FUND 2 Member kb:LIMEGLOBALEYEALPPRIVATEEQUITYFUND2Member
4006 LIME ORANGE PRIVATE EQUITY FUND 6 Member kb:LIMEORANGEPRIVATEEQUITYFUND6Member
4007 DAEDUCK PARC1 PRIVATE EQUITY FUND 1 Member kb:DAEDUCKPARC1PRIVATEEQUITYFUND1Member
4008 LIME PLUTO FI PRIVATE EQUITY FUND D-1 Member kb:LIMEPLUTOFIPRIVATEEQUITYFUNDD1Member
4009 KB Star Fund_KB Value Focus Korea Equity Member kb:KBStarFund_KBValueFocusKoreaEquityMember
4010 Aquila Global Real Assets Fund No.1 LP Member kb:AquilaGlobalRealAssetsFundNo1LPMember
4011 Able Quant Asia Pacific Feeder Fund(T.E.) Limited Member kb:AbleQuantAsiaPacificFeederFundTELimitedMember
4012 Able Quant Asia Pacific Master Fund Limited Member kb:AbleQuantAsiaPacificMasterFundLimitedMember
4013 Global Investment Opportunity Limited Member kb:GlobalInvestmentOpportunityLimitedMember
4014 Hyundai Smart Index Alpha Securities Master Investment Trust Member kb:HyundaiSmartIndexAlphaSecuritiesMasterInvestmentTrustMember
4015 Hyundai Trust Securities Master Investment Trust - Bond Member kb:HyundaiTrustSecuritiesMasterInvestmentTrustBondMember
4016 Hyundai Value Plus Securities Master Investment Trust Member kb:HyundaiValuePlusSecuritiesMasterInvestmentTrustMember
4017 Hyundai Dynamic Mix Securities Master Investment Trust Member kb:HyundaiDynamicMixSecuritiesMasterInvestmentTrustMember
4018 Hyundai Quant Long Short Securities Master Investment Trust Member kb:HyundaiQuantLongShortSecuritiesMasterInvestmentTrustMember
4019 AGRAF Real Estate No.1, Senningerberg Member kb:AGRAFRealEstateNo1SenningerbergMember
4020 AGRAF Real Estate Holding No.1, Senningerberg Member kb:AGRAFRealEstateHoldingNo1SenningerbergMember
4021 Vierte CasaLog GmbH & Co. KG and 2 others Member kb:VierteCasaLogGmbHCoKGand2othersMember
4022 KB Asset Management Singapore Pte, Ltd. Member kb:KBAssetManagementSingaporePteLtdMember
4023 ABLE NJ DSM INVESTMENT REIT Member kb:ABLENJDSMINVESTMENTREITMember
4024 ABLE NJ DSM, LLC Member kb:ABLENJDSMLLCMember
4025 HYUNDAI ABLE INVESTMENT REIT Member kb:HYUNDAIABLEINVESTMENTREITMember
4026 HYUNDAI ABLE PATRIOTS PARK, LLC Member kb:HYUNDAIABLEPATRIOTSPARKLLCMember
4027 Dongbu Private Fund 16th Member kb:DongbuPrivateFund16thMember
4028 Hana Landchip Real estate Private Fund 58th Member kb:HanaLandchipRealEstatePrivateFund58thMember
4029 Hyundai Aviation Private Fund 3rd Member kb:HyundaiAviationPrivateFund3rdMember
4030 Hyundai Power Private Fund 3rd Member kb:HyundaiPowerPrivateFund3rdMember
4031 Hyundai Power Professional Investment Type Private Investment Fund No.4 Member kb:HyundaiPowerProfessionalInvestmentTypePrivateInvestmentFundNo4Member
4032 KB U.S. LongShort Private Securities Fund 1 Member kb:KBUSLongShortPrivateSecuritiesFund1Member
4033 Hyundai Infra Professional Investment Type Private Investment Trust No.5 Member kb:HyundaiInfraProfessionalInvestmentTypePrivateInvestmentTrustNo5Member
4034 KB SAUDI Private Special Asset Fund Member kb:KBSAUDIPrivateSpecialAssetFundMember
4035 Meritz Private Real Estate Fund 8 Member kb:MeritzPrivateRealEstateFund8Member
4036 KB Global Equity Solution Securities Feeder Fund(Equity-FoFs) Member kb:KBGlobalEquitySolutionSecuritiesFeederFundEquityFoFsMember
4037 KB Global Multiasset Income Securities Feeder Fund(Bond Mixed-FoFs) Member kb:KBGlobalMultiassetIncomeSecuritiesFeederFundBondMixedFoFsMember
4038 KB Everyone TDF 2020 Securities Investment Trust - Bond Balanced-Fund of Funds Member kb:KBEveryoneTDF2020SecuritiesInvestmentTrustBondBalancedFundOfFundsMember
4039 KB Everyone TDF 2025 Securities Investment Trust - Bond Balanced-Fund of Funds Member kb:KBEveryoneTDF2025SecuritiesInvestmentTrustBondBalancedFundOfFundsMember
4040 KB Everyone TDF 2030 Securities Investment Trust - Equity Balanced-Fund of Funds Member kb:KBEveryoneTDF2030SecuritiesInvestmentTrustEquityBalancedFundOfFundsMember
4041 KB Everyone TDF 2035 Securities Investment Trust - Equity Balanced-Fund of Funds Member kb:KBEveryoneTDF2035SecuritiesInvestmentTrustEquityBalancedFundOfFundsMember
4042 KB Everyone TDF 2040 Securities Investment Trust - Equity Balanced-Fund of Funds Member kb:KBEveryoneTDF2040SecuritiesInvestmentTrustEquityBalancedFundOfFundsMember
4043 KB Everyone TDF 2045 Securities Investment Trust - Equity Balanced-Fund of Funds Member kb:KBEveryoneTDF2045SecuritiesInvestmentTrustEquityBalancedFundOfFundsMember
4044 KB Everyone TDF 2050 Securities Investment Trust - Equity Balanced-Fund of Funds Member kb:KBEveryoneTDF2050SecuritiesInvestmentTrustEquityBalancedFundOfFundsMember
4045 Personal pension trusts and 10 other trusts Member kb:Personalpensiontrustsand10othertrustsMember
4046 Disclosure Of Significant Investments In Subsidiaries Line Items [Line Items] LineItems ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesLineItems
4047 Investor Concept (Text/String) For Period kb:NameOfInvestor
4048 Investee Concept (Text/String) For Period ifrs-full:NameOfSubsidiary
4049 Ownership interests(%) Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInSubsidiary
4050 Location Concept (Text/String) For Period ifrs-full:CountryOfIncorporationOrResidenceOfSubsidiary
4051 Date of financial statements Concept (Date) For Period ifrs-full:DateOfEndOfReportingPeriodOfFinancialStatementsOfSubsidiary
4052 Industry Concept (Text/String) For Period ifrs-full:PrincipalPlaceOfBusinessOfSubsidiary
4053 Description Of Nature Of Relationship With Subsidiary Where Parent Has Directly Or Indirectly Less Than Half Of Voting Power Concept (Text/String) For Period ifrs-full:DescriptionOfNatureOfRelationshipWithSubsidiaryWhereParentHasDirectlyOrIndirectlyLessThanHalfOfVotingPower
4054 24400102 - Disclosure - Subsidiaries_The Condensed Financial Information Of Major Subsidiaries(Details) Network

*

*

 http://www.kbfg.com/role/SubsidiariesTheCondensedFinancialInformationOfMajorSubsidiariesDetails
4055 Disclosure Of Condensed Financial Information Of Significant Investments In Subsidiaries Table [Table] Table

*

*

 kb:DisclosureOfCondensedFinancialInformationOfSignificantInvestmentsInSubsidiariesTable
4056 Significant Investments In Subsidiaries Axis [Axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
4057 Entitys Total For Subsidiaries Member [Domain] Member ifrs-full:EntitysTotalForSubsidiariesMember
4058 Major Subsidiaries Member [Member] Member kb:MajorSubsidiariesMember
4059 Kookmin Bank Member kb:KookminBankMember
4060 KB Securities Co., Ltd. Member kb:KBSecuritiesCoLtdMember
4061 KB Kookmin Card Co., Ltd. Member kb:KBKookminCardCoLtdMember
4062 KB Insurance Co., Ltd. Member kb:KBInsuranceCoLtdMember
4063 KB Life Insurance Co., Ltd. Member kb:KBLifeInsuranceCoLtdMember
4064 KB Asset Management Co., Ltd. Member kb:KBAssetManagementCoLtdMember
4065 KB Capital Co.,Ltd. Member kb:KBCapitalCoLtdMember
4066 KB Savings Bank Co., Ltd. Member kb:KBSavingsBankCoLtdMember
4067 KB Real Estate Trust Co., Ltd. Member kb:KBRealEstateTrustCoLtdMember
4068 KB Investment Co., Ltd. Member kb:KBInvestmentCoLtdMember
4069 KB Credit Information Co., Ltd. Member kb:KBCreditInformationCoLtdMember
4070 KB Data System Co., Ltd. Member kb:KBDataSystemCoLtdMember
4071 Disclosure Of Condensed Financial Information Of Significant Investments In Subsidiaries Line Items [Line Items] LineItems kb:DisclosureOfCondensedFinancialInformationOfSignificantInvestmentsInSubsidiariesLineItems
4072 Subsidiaries Condensed Financial Information Abstract [Abstract] Abstract kb:SubsidiariesCondensedFinancialInformationAbstract
4073 Assets Concept (Monetary) As Of Debit kb:SubsidiariesCondensedFinancialInformationAssets
4074 Liabilities Concept (Monetary) As Of Credit kb:SubsidiariesCondensedFinancialInformationLiabilities
4075 Equity Concept (Monetary) As Of Credit kb:SubsidiariesCondensedFinancialInformationEquity
4076 Operating income(Revenue) Concept (Monetary) For Period Credit kb:SubsidiariesCondensedFinancialInformationShareOfOperatingIncomeOrRevenue
4077 Profit(loss) for the period Concept (Monetary) For Period Credit kb:SubsidiariesCondensedFinancialInformationShareOfNetIncomeLoss
4078 Total comprehensive income for the period Concept (Monetary) For Period Credit kb:SubsidiariesCondensedFinancialInformationShareOfComprehensiveIncome
4079 Description Of Basis Of Preparation Of Condensed Financial Information Of Subsidiary Concept (Text/String) For Period kb:DescriptionOfBasisOfPreparationOfCondensedFinancialInformationOfSubsidiary
4080 24400103 - Disclosure - Subsidiaries_Nature Of The Risks Associated With Interests In Consolidated Structured Entities (Details) Network

*

*

 http://www.kbfg.com/role/SubsidiariesNatureOfTheRisksAssociatedWithInterestsInConsolidatedStructuredEntitiesDetails
4081 Disclosure Of Information About Consolidated Structured Entities Table [Table] Table

*

*

 ifrs-full:DisclosureOfInformationAboutConsolidatedStructuredEntitiesTable
4082 Consolidated Structured Entities Axis [Axis] Axis ifrs-full:ConsolidatedStructuredEntitiesAxis
4083 Entitys Total For Consolidated Structured Entities Member [Domain] Member ifrs-full:EntitysTotalForConsolidatedStructuredEntitiesMember
4084 KL 1st Inc. and other subsidiaries Member kb:KL1stIncAndOtherSubsidiariesMember
4085 KB Wise Star Private Real Estate Feeder Fund 1st. And 8 other subsidiaries Member kb:KBWiseStarPrivateRealEstateFeederFund1stAnd8OtherSubsidiariesMember
4086 Trust Member kb:TrustMember
4087 Disclosure Of Information About Consolidated Structured Entities Line Items [Line Items] LineItems ifrs-full:DisclosureOfInformationAboutConsolidatedStructuredEntitiesLineItems
4088 Exposure Of The Risks Associated With Interests In Consolidated Structured Entities Concept (Monetary) As Of Credit kb:ExposureOfTheRisksAssociatedWithInterestsInConsolidatedStructuredEntities
4089 Description Of Terms Of Contractual Arrangements That Could Require Parent Or Subsidiaries To Provide Financial Support To Structured Entity Concept (Text/String) For Period ifrs-full:DescriptionOfTermsOfContractualArrangementsThatCouldRequireParentOrSubsidiariesToProvideFinancialSupportToStructuredEntity
4090 24400104 - Disclosure - Subsidiaries_Changes In Subsidiaries (Details) Network

*

*

 http://www.kbfg.com/role/SubsidiariesChangesInSubsidiariesDetails
4091 Disclosure Of Changes In Parents Ownership Interest In Subsidiary Table [Table] Table

*

*

 kb:DisclosureOfChangesInParentsOwnershipInterestInSubsidiaryTable
4092 Consolidated Structured Entities Axis [Axis] Axis ifrs-full:ConsolidatedStructuredEntitiesAxis
4093 Entitys Total For Consolidated Structured Entities Member [Domain] Member ifrs-full:EntitysTotalForConsolidatedStructuredEntitiesMember
4094 Changes In Consolidation Member [Member] Member kb:ChangesInConsolidationMember
4095 Company Member kb:IncludedInConsolidationMember
4096 KB Insurance Co., Ltd. and 45 others Member kb:KBInsuranceCoLtdAnd45OthersMember
4097 Able Jungdong Co., Ltd. and 42 others Member kb:AbleJungdongCoLtdAnd42OthersMember
4098 KB Haeoreum private securities investment trust 70(Bond) and 3 others Member kb:KBHaeoreumPrivateSecuritiesInvestmentTrust70BondAnd3OthersMember
4099 KB KONEX Market Vitalization Fund and 3 other Member kb:KBKonexMarketVitalizationFundAnd3OtherMember
4100 Company Member kb:ExcludedFromConsolidationMember
4101 2014ABLEOPO 2ND Co., Ltd. and 44 others Member kb:Ableopo20142ndCoLtdAnd44OthersMember
4102 Wise Mobile Eighth Securitization Specialty Co., Ltd and 5 others Member kb:WiseMobileEighthSecuritizationSpecialtyCoLtdAnd5OthersMember
4103 Hyundai Asset Management Co., Ltd. and 17 others Member kb:HyundaiAssetManagementCoLtdAnd17OthersMember
4104 KB Evergreen bond fund No.98 (Bond) and 1 other Member kb:KBEvergreenBondFundNo98BondAnd1OtherMember
4105 Hyundai Trust Securities Feeder Investment Trust No.1 Bond Member kb:HyundaiTrustSecuritiesFeederInvestmentTrustNo1BondMember
4106 Disclosure Of Changes In Parents Ownership Interest In Subsidiary Line Items [Line Items] LineItems kb:DisclosureOfChangesInParentsOwnershipInterestInSubsidiaryLineItems
4107 Description Concept (Text/String) For Period ifrs-full:DescriptionOfNatureOfRelationshipWithSubsidiaryWhereParentHasDirectlyOrIndirectlyLessThanHalfOfVotingPower
4108 24400105 - Disclosure - Subsidiaries_Summarized Financial Information Relating To Material Noncontrolling Interests(Details) Network

*

*

 http://www.kbfg.com/role/SubsidiariesSummarizedFinancialInformationRelatingToMaterialNoncontrollingInterestsDetails
4109 Implied Table Table

*

*

 implied:Table
4110 Summarized Financial Information Relating To Subsidiaries That Have Material Non Controlling Interests Abstract [Abstract] Abstract kb:SummarizedFinancialInformationRelatingToSubsidiariesThatHaveMaterialNonControllingInterestsAbstract
4111 Non-controlling interests percentage Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestsHeldByNoncontrollingInterests
4112 Non-controlling interests Abstract kb:NoncontrollingInterestsAbstract
4113 Assets of subsidiaries Concept (Monetary) As Of Debit kb:AssetsOfSubsidiariesThatHaveMaterialNonControllingInterests
4114 Liabilities of subsidiaries Concept (Monetary) As Of Credit kb:LiabilitiesOfSubsidiariesThatHaveMaterialNonControllingInterests
4115 Equity of subsidiaries Concept (Monetary) As Of Credit kb:EquityOfSubsidiariesThatHaveMaterialNonControllingInterests
4116 Non-controlling interests Concept (Monetary) As Of Credit kb:NoncontrollingInterestsThatHaveMaterialNonControllingInterests
4117 Profit attributable to non-controlling interests Abstract kb:ProfitLossAttributableToNoncontrollingInterestsAbstract
4118 Operating profit of subsidiaries Concept (Monetary) For Period Credit kb:OperatingProfitOfSubsidiariesThatHaveMaterialNonControllingInterests
4119 Profit of subsidiaries Concept (Monetary) For Period Credit kb:ProfitOfSubsidiariesThatHaveMaterialNonControllingInterests
4120 Profit loss attributable to non-controlling interests Concept (Monetary) For Period Credit kb:ProfitLossAttributableToNoncontrollingInterestsThatHaveMaterialNonControllingInterests
4121 Cash flows of subsidiaries Abstract kb:CashFlowsOfSubsidiariesThatHaveMaterialNonControllingInterestsAbstract
4122 Cash flows from operating activities Concept (Monetary) For Period Debit kb:CashFlowsFromOperatingActivitiesOfSubsidiariesThatHaveMaterialNonControllingInterests
4123 Cash flows from investing activities Concept (Monetary) For Period Debit kb:CashFlowsFromInvestingActivitiesOfSubsidiariesThatHaveMaterialNonControllingInterests
4124 Cash flows from financing activities Concept (Monetary) For Period Debit kb:CashFlowsFromFinancingActivitiesOfSubsidiariesThatHaveMaterialNonControllingInterests
4125 Net increase(decrease) in cash and cash equivalents Concept (Monetary) For Period Debit kb:NetIncreaseDecreaseInCashAndCashEquivalentsOfSubsidiariesThatHaveMaterialNonControllingInterests
4126 24410101 - Disclosure - Unconsolidated Structured Entity_The Nature Purpose And Activities Of The Unconsolidated Structured Entities And How The Structured Entities Are Financed(Details) Network

*

*

 http://www.kbfg.com/role/UnconsolidatedStructuredEntityTheNaturePurposeAndActivitiesOfTheUnconsolidatedStructuredEntitiesAndHowTheStructuredEntitiesAreFinancedDetails
4127 Disclosure Of Unconsolidated Structured Entities Table [Table] Table

*

*

 ifrs-full:DisclosureOfUnconsolidatedStructuredEntitiesTable
4128 Unconsolidated Structured Entities Axis [Axis] Axis ifrs-full:UnconsolidatedStructuredEntitiesAxis
4129 Entitys Total For Unconsolidated Structured Entities Member [Domain] Member ifrs-full:EntitysTotalForUnconsolidatedStructuredEntitiesMember
4130 Nature Member ifrs-full:UnconsolidatedStructuredEntitiesMember
4131 Asset-backed securitization Member ifrs-full:AssetbackedFinancingsMember
4132 Project Financing Member kb:ProjectFinancingMember
4133 Trust Member kb:TrustMember
4134 Fund Member ifrs-full:InvestmentFundsMember
4135 Other Unconsolidated Structured Entities Member [Member] Member kb:OtherUnconsolidatedStructuredEntitiesMember
4136 Disclosure Of Unconsolidated Structured Entities Line Items [Line Items] LineItems ifrs-full:DisclosureOfUnconsolidatedStructuredEntitiesLineItems
4137 Purpose Concept (Text/String) For Period ifrs-full:DescriptionOfTypesOfIncomeFromStructuredEntities
4138 Activity Concept (Text/String) For Period kb:DescriptionOfActivityOfStructuredEntities
4139 Method of Financing Concept (Text/String) For Period kb:DescriptionOfHowStructuredEntityIsFinanced
4140 24410102 - Disclosure - Unconsolidated Structured Entity_The Size Of The Unconsolidated Structured Entities And The Risks Associated With Its Interests In Unconsolidated Structured Entities(Details) Network

*

*

 http://www.kbfg.com/role/UnconsolidatedStructuredEntityTheSizeOfTheUnconsolidatedStructuredEntitiesAndTheRisksAssociatedWithItsInterestsInUnconsolidatedStructuredEntitiesDetails
4141 Disclosure Of Unconsolidated Structured Entities Table [Table] Table

*

*

 ifrs-full:DisclosureOfUnconsolidatedStructuredEntitiesTable
4142 Unconsolidated Structured Entities Axis [Axis] Axis ifrs-full:UnconsolidatedStructuredEntitiesAxis
4143 Entitys Total For Unconsolidated Structured Entities Member [Domain] Member ifrs-full:EntitysTotalForUnconsolidatedStructuredEntitiesMember
4144 Nature Member ifrs-full:UnconsolidatedStructuredEntitiesMember
4145 Asset-backed securitization Member ifrs-full:AssetbackedFinancingsMember
4146 Project Financing Member kb:ProjectFinancingMember
4147 Trust Member kb:TrustMember
4148 Fund Member ifrs-full:InvestmentFundsMember
4149 Others Member kb:OtherUnconsolidatedStructuredEntitiesMember
4150 Balance Sheet Location Axis [Axis] Axis us-gaap:BalanceSheetLocationAxis
4151 Balance Sheet Location Domain [Domain] Member us-gaap:BalanceSheetLocationDomain
4152 Carrying amount on financial statements Member ifrs-full:ClassesOfFinancialInstrumentsMember
4153 Assets Member kb:TyepOfAssetsMember
4154 Financial assets at fair value through profit or loss Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember
4155 Derivative financial assets Member us-gaap:DerivativeFinancialInstrumentsAssetsMember
4156 Loans Member ifrs-full:LoansAndReceivablesCategoryMember
4157 Financial investments Member kb:FinancialInvestmentsMember
4158 Investment in associates and joint venture Member kb:AssociatesAndJointVenturesMember
4159 Other assets Member ifrs-full:OtherAssetsMember
4160 Liabilities Member ifrs-full:OtherContingentLiabilitiesMember
4161 Deposits Member us-gaap:DepositsMember
4162 Derivative financial liabilities Member us-gaap:DerivativeFinancialInstrumentsLiabilitiesMember
4163 Other liabilities Member us-gaap:OtherLiabilitiesMember
4164 Disclosure Of Unconsolidated Structured Entities Line Items [Line Items] LineItems ifrs-full:DisclosureOfUnconsolidatedStructuredEntitiesLineItems
4165 Total assets of unconsolidated Structured Entity Concept (Monetary) As Of Debit kb:AssetsOfUnconsolidatedStructuredEntities
4166 Assets Recognised In Entitys Financial Statements In Relation To Structured Entities Concept (Monetary) As Of Debit ifrs-full:AssetsRecognisedInEntitysFinancialStatementsInRelationToStructuredEntities
4167 Liabilities Recognised In Entitys Financial Statements In Relation To Structured Entities Concept (Monetary) As Of Credit ifrs-full:LiabilitiesRecognisedInEntitysFinancialStatementsInRelationToStructuredEntities
4168 Maximum exposure to loss Concept (Monetary) As Of ifrs-full:MaximumExposureToLossFromInterestsInStructuredEntities
4169 Holding Assets Maximum Exposure To Loss From Interests In Structured Entities Concept (Monetary) As Of Debit kb:HoldingAssetsMaximumExposureToLossFromInterestsInStructuredEntities
4170 Purchase and investment commitments Concept (Monetary) As Of Credit kb:PurchaseAndInvestmentCommitmentsMaximumExposureToLossFromInterestsInStructuredEntities
4171 Unused credit Concept (Monetary) As Of Credit kb:UnusedCreditMaximumExposureToLossFromInterestsInStructuredEntities
4172 Payment guarantee and lan commitments Concept (Monetary) As Of Credit kb:PaymentGuaranteeAndLoanCommitmentsMaximumExposureToLossFromInterestsInStructuredEntities
4173 Methods of determining the maximum exposure to loss Concept (Text/String) For Period ifrs-full:InformationAboutHowMaximumExposureToLossFromInterestsInStructuredEntitiesIsDetermined
4174 Description Of Comparison Between Assets And Liabilities Recognised In Relation To Structured Entities And Maximum Exposure To Loss From Interests In Structured Entities Concept (Text/String) For Period ifrs-full:DescriptionOfComparisonBetweenAssetsAndLiabilitiesRecognisedInRelationToStructuredEntitiesAndMaximumExposureToLossFromInterestsInStructuredEntities
4175 24420101 - Disclosure - Finance and Operating Lease_The Future Minimum Lease Payments Arising(Details) Network

*

*

 http://www.kbfg.com/role/FinanceAndOperatingLeaseTheFutureMinimumLeasePaymentsArisingDetails
4176 Disclosure Of Finance Lease And Operating Lease By Lessee Table [Table] Table

*

*

 ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeTable
4177 Maturity Axis [Axis] Axis ifrs-full:MaturityAxis
4178 Aggregated Time Bands Member [Domain] Member ifrs-full:AggregatedTimeBandsMember
4179 Within 1 year Member ifrs-full:NotLaterThanOneYearMember
4180 1~5 years Member ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember
4181 Over 5 years Member ifrs-full:LaterThanFiveYearsMember
4182 Disclosure Of Finance Lease And Operating Lease By Lessee Line Items [Line Items] LineItems ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeLineItems
4183 Net carrying amount of finance lease assets Concept (Monetary) As Of Debit ifrs-full:RecognisedFinanceLeaseAsAssets
4184 Disclosure Of Finance Lease By Lessee Abstract [Abstract] Abstract kb:DisclosureOfFinanceLeaseByLesseeAbstract
4185 Minimum lease payment Concept (Monetary) As Of Credit ifrs-full:MinimumFinanceLeasePaymentsPayable
4186 Present value of minimum lease payment Concept (Monetary) As Of Credit ifrs-full:MinimumFinanceLeasePaymentsPayableAtPresentValue
4187 Disclosure Of Operating Lease By Lessee Abstract [Abstract] Abstract kb:DisclosureOfOperatingLeaseByLesseeAbstract
4188 Minimum lease payment Concept (Monetary) As Of Credit ifrs-full:MinimumLeasePaymentsPayableUnderNoncancellableOperatingLease
4189 Minimum sublease payment Concept (Monetary) As Of Debit ifrs-full:ExpectedFutureMinimumSubleasePaymentsReceivableUnderNoncancellableSubleasesClassifiedAsOperatingLease
4190 24420102 - Disclosure - Finance and Operating Lease_Total Lease Investment And The Present Value Of Minimum Lease Payments(Details) Network

*

*

 http://www.kbfg.com/role/FinanceAndOperatingLeaseTotalLeaseInvestmentAndThePresentValueOfMinimumLeasePaymentsDetails
4191 Disclosure Of Finance Lease And Operating Lease By Lessor Table [Table] Table

*

*

 ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLessorTable
4192 Maturity Axis [Axis] Axis ifrs-full:MaturityAxis
4193 Aggregated Time Bands Member [Domain] Member ifrs-full:AggregatedTimeBandsMember
4194 Within 1 year Member ifrs-full:NotLaterThanOneYearMember
4195 1~5 years Member ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember
4196 Over 5 years Member ifrs-full:LaterThanFiveYearsMember
4197 Disclosure Of Finance Lease And Operating Lease By Lessor Line Items [Line Items] LineItems ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLessorLineItems
4198 Disclosure Of Finance Lease By Lessor Abstract [Abstract] Abstract kb:DisclosureOfFinanceLeaseByLessorAbstract
4199 Total lease investment Concept (Monetary) As Of Debit ifrs-full:GrossInvestmentInFinanceLease
4200 Present value of minimum lease payment Concept (Monetary) As Of Debit ifrs-full:MinimumFinanceLeasePaymentsReceivableAtPresentValue
4201 Unearned interest income Concept (Monetary) As Of Debit ifrs-full:UnearnedFinanceIncomeOnFinanceLease
4202 Disclosure Of Operating Lease By Lessor Abstract [Abstract] Abstract kb:DisclosureOfOperatingLeaseByLessorAbstract
4203 Minimum lease receipts Concept (Monetary) As Of Debit ifrs-full:MinimumLeasePaymentsReceivableUnderNoncancellableOperatingLease
4204 24420103 - Disclosure - Finance and Operating Lease_The Lease Payment Reflected In Profit Or Loss(Details) Network

*

*

 http://www.kbfg.com/role/FinanceAndOperatingLeaseTheLeasePaymentReflectedInProfitOrLossDetails
4205 Implied Table Table

*

*

 implied:Table
4206 Lease And Sublease Payments Recognised As Expense Abstract [Abstract] Abstract ifrs-full:LeaseAndSubleasePaymentsRecognisedAsExpenseAbstract
4207 Minimum lease payment Concept (Monetary) For Period Debit ifrs-full:MinimumOperatingLeasePayments
4208 Sublease payment Concept (Monetary) For Period Debit ifrs-full:SubleasePaymentsRecognisedAsExpense
4209 Total Concept (Monetary) For Period Debit ifrs-full:LeaseAndSubleasePaymentsRecognisedAsExpense
4210 24430101 - Disclosure - Related Party Transactions_Profit And Loss Arising From Transactions With Related Parties(Details) Network

*

*

 http://www.kbfg.com/role/RelatedPartyTransactionsProfitAndLossArisingFromTransactionsWithRelatedPartiesDetails
4211 Disclosure Of Transactions Between Related Parties Table [Table] Table

*

*

 ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesTable
4212 Categories Of Related Parties Axis [Axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
4213 Entitys Total For Related Parties Member [Domain] Member ifrs-full:EntitysTotalForRelatedPartiesMember
4214 Related Parties Member [Member] Member ifrs-full:RelatedPartiesMember
4215 Associates and Joint Ventures Member ifrs-full:AssociatesMember
4216 KB Insurance Co., Ltd. Member kb:KBInsuranceCoLtdMember
4217 Balhae Infrastructure Fund Member kb:BalhaeInfrastructureFundMember
4218 Korea Credit Bureau Co., Ltd. Member kb:KoreaCreditBureauCoLtdMember
4219 UAMCO., Ltd. Member kb:UAMCOLtdMember
4220 JSC Bank CenterCredit Member kb:JSCBankCenterCreditMember
4221 KoFC KBIC Frontier Champ 2010-5(PEF) Member kb:KoFCKBICFrontierChamp20105PEFMember
4222 Terra Co., Ltd. Member kb:TerraCoLtdMember
4223 United PF 1st Recovery Private Equity Fund Member kb:UnitedPF1stRecoveryPrivateEquityFund1Member
4224 KB GwS Private Securities Investment Trust Member kb:KBGwSPrivateSecuritiesInvestmentTrustMember
4225 IMM Investment 5th PRIVATE EQUITY FUND Member kb:IMMInvestment5thPRIVATEEQUITYFUNDMember
4226 Incheon Bridge Co., Ltd. Member kb:IncheonBridgeCoLtdMember
4227 Jaeyang Industry Co., Ltd. Member kb:JaeyangIndustryCoLtdMember
4228 HIMS Co., Ltd. Member kb:HIMSCoLtdMember
4229 KoFC POSCO HANHWA KB Shared Growth Private Equity Fund No. 2 Member kb:KoFCPOSCOHANHWAKBSharedGrowthPrivateEquityFundNo2Member
4230 Jungdo Co., Ltd. Member kb:JungdoCoLtdMember
4231 Dongjo Co., Ltd. Member kb:DongjoCoLtdMember
4232 Aju Good Technology Venture Fund Member kb:AjuGoodTechnologyVentureFundMember
4233 Ejade Co., Ltd. Member kb:EjadeCoLtdMember
4234 Jungdong Steel Co., Ltd. Member kb:JungdongSteelCoLtdMember
4235 Doosung Metal Co., Ltd. Member kb:DoosungMetalCoLtdMember
4236 KB Star Office Private Real Estate Investment Trust No.1 Member kb:KBStarofficePrivaterealestateInvestmentTrustNo1Member
4237 NPS KBIC Private Equity Fund No. 1 Member kb:NPSKBICPrivateEquityFundNo1Member
4238 RAND Bio Science Co., Ltd. Member kb:RANDBioScienceCoLtdMember
4239 Inno Lending Co., Ltd. Member kb:InnoLendingCoLtdMember
4240 isMedia Co., Ltd. Member kb:IsMediaCoLtdMember
4241 KBIC Private Equity Fund No. 3 Member kb:KBICPrivateEquityFundNo3Member
4242 E-clear International Co., Ltd. Member kb:EClearInternationalCoLtdMember
4243 Sawnics Co., Ltd. Member kb:SawnicsCoLtd1Member
4244 SY Auto Capital Co., Ltd. Member kb:SYAutoCapitalCoLtdMember
4245 Kyobo 7 Special Purpose Acquisition Co., Ltd. Member kb:Kyobo7SpecialPurposeAcquisitionCoLtdMember
4246 Food Factory Co., Ltd. Member kb:FoodFactoryCoLtdMember
4247 KB Pre IPO Secondary Venture Fund 1st Member kb:KBPreIPOSecondaryVentureFund1stMember
4248 Builton Co., Ltd. Member kb:BuiltonCoLtdMember
4249 Member kb:KBPrivateEquityFundIIIMember
4250 Wise Asset Management Co., Ltd. Member kb:WiseAssetManagementCoLtdMember
4251 Acts Co., Ltd. Member kb:ActsCoLtdMember
4252 Korbi Co., Ltd. Member kb:KorbiCoLtdMember
4253 POSCO-KB Shipbuilding Fund Member kb:POSCOKBShipbuildingFundMember
4254 Dae-A Leisure Co., Ltd. Member kb:DaeALeisureCoLtdMember
4255 Paycoms Co., Ltd. Member kb:PaycomsCoLtdMember
4256 Bungaejanter. Inc. Member kb:BungaejanterIncMember
4257 Faromancorporation Co., Ltd. Member kb:FaromancorporationCoLtdMember
4258 Daesang Techlon Co., Ltd. Member kb:DaesangTechlonCoLtdMember
4259 Big Dipper Co., Ltd. Member kb:BigDipperCoLtdMember
4260 KB-KDBC New Technology Business Investment Fund Member kb:KBKDBCNewTechnologyBusinessInvestmentFundMember
4261 KB No.3 Special Purpose Acquisition Company Member kb:KBNo3SpecialPurposeAcquisitionCompanyMember
4262 KB No.4 Special Purpose Acquisition Company Member kb:KBNo4SpecialPurposeAcquisitionCompanyMember
4263 KB No.5 Special Purpose Acquisition Company Member kb:KBNo5SpecialPurposeAcquisitionCompanyMember
4264 KB No.6 Special Purpose Acquisition Company Member kb:KBNo6SpecialPurposeAcquisitionCompanyMember
4265 KB No.7 Special Purpose Acquisition Company Member kb:KBNo7SpecialPurposeAcquisitionCompanyMember
4266 KB No.8 Special Purpose Acquisition Company Member kb:KBNo8SpecialPurposeAcquisitionCompanyMember
4267 KB No.9 Special Purpose Acquisition Company Member kb:KBNo9SpecialPurposeAcquisitionCompanyMember
4268 KB No.10 Special Purpose Acquisition Company Member kb:KBNo10SpecialPurposeAcquisitionCompanyMember
4269 KB No.11 Special Purpose Acquisition Company Member kb:KBNo11SpecialPurposeAcquisitionCompanyMember
4270 Hyundai-Tongyang Agrifood Private Equity Fund Member kb:Hyundai-TongyangAgrifoodPrivateEquityFundMember
4271 KB IGen Private Equity Fund No. 1 Member kb:KBIGenPrivateEquityFundNo1Member
4272 Keystone-Hyundai Securities No. 1 Private Equity Fund Member kb:KeystoneHyundaiSecuritiesNo1PrivateEquityFundMember
4273 MJT&I Co., Ltd. Member kb:MJTAndICoLtdMember
4274 Key management Member ifrs-full:KeyManagementPersonnelOfEntityOrParentMember
4275 Other Member ifrs-full:OtherRelatedPartiesMember
4276 Retirement pension Member kb:RetirementpensionMember
4277 Disclosure Of Transactions Between Related Parties Line Items [Line Items] LineItems ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems
4278 Related Party Transactions Abstract [Abstract] Abstract ifrs-full:RelatedPartyTransactionsAbstract
4279 Interest income Concept (Monetary) For Period Credit kb:InterestIncomeRelatedPartyTransactions
4280 Interest expense Concept (Monetary) For Period Debit kb:InterestExpenseRelatedPartyTransactions
4281 Fee and commission income Concept (Monetary) For Period Credit kb:FeeAndCommissionIncomeRelatedPartyTransactions
4282 Fee and commission expense Concept (Monetary) For Period Debit kb:FeeAndCommissionExpenseRelatedPartyTransactions
4283 Insurance income Concept (Monetary) For Period Credit kb:InsuranceIncomeRelatedPartyTransactions
4284 Gains on financial assets/liabilities at fair value through profit or loss Concept (Monetary) For Period Credit kb:GainsOnFinancialAssetsAndLiabilitiesAtFairValueThroughProfitOrLossRelatedPartyTransactions
4285 Losses on financial assets/liabilities at fair value through profit or loss Concept (Monetary) For Period Debit kb:LossesOnFinancialAssetsAndLiabilitiesAtFairValueThroughProfitOrLossRelatedPartyTransactions
4286 Other operating income Concept (Monetary) For Period Credit kb:OtherOperatingIncomeRelatedPartyTransactions
4287 Other operating expense Concept (Monetary) For Period Debit kb:OtherOperatingExpenseRelatedPartyTransactions
4288 General and administrative expenses Concept (Monetary) For Period Debit kb:GeneralAndAdministrativeExpensesRelatedPartyTransactions
4289 Reversal for credit loss Concept (Monetary) For Period Credit kb:ReversalForCreditLossRelatedPartyTransactions
4290 Provision for credit loss Concept (Monetary) For Period Debit kb:ProvisionForCreditLossRelatedPartyTransactions
4291 Other non-operating income Concept (Monetary) For Period Credit kb:OtherNonOperatingIncomeRelatedPartyTransactions
4292 Other non-operating expense Concept (Monetary) For Period Debit kb:OtherNonOperatingExpenseRelatedPartyTransactions
4293 Outstanding Balances For Related Party Transactions Abstract [Abstract] Abstract ifrs-full:OutstandingBalancesForRelatedPartyTransactionsAbstract
4294 Cash and due from financial institutions Concept (Monetary) As Of Debit kb:CashAndDueFromFinancialInstitutionsRelatedPartyTransactions
4295 Loans and receivables (Gross amount) Concept (Monetary) As Of Debit kb:LoansAndReceivablesGrossAmountRelatedPartyTransactions
4296 Allowances for loan losses Concept (Monetary) As Of Credit kb:AllowancesForLoanLossesRelatedPartyTransactions
4297 Derivative financial assets Concept (Monetary) As Of Debit kb:DerivativeFinancialAssetsRelatedPartyTransactions
4298 Intangible assets Concept (Monetary) As Of Debit kb:IntangibleAssetsRelatedPartyTransactions
4299 Other assets Concept (Monetary) As Of Debit kb:OtherAssetsRelatedPartyTransactions
4300 Debts Concept (Monetary) As Of Credit kb:DebtsRelatedPartyTransactions
4301 Deposits Concept (Monetary) As Of Credit kb:DepositsRelatedPartyTransactions
4302 Derivative financial liabilities Concept (Monetary) As Of Credit kb:DerivativeFinancialLiabilitiesRelatedPartyTransactions
4303 Provisions Concept (Monetary) As Of Credit kb:ProvisionsRelatedPartyTransactions
4304 Insurance contract liabilities Concept (Monetary) As Of Credit kb:InsuranceContractLiabilitiesRelatedPartyTransactions
4305 Other liabilities Concept (Monetary) As Of Credit kb:OtherLiabilitiesRelatedPartyTransactions
4306 Description Of Transactions With Related Party Concept (Text/String) For Period ifrs-full:DescriptionOfTransactionsWithRelatedParty
4307 24430102 - Disclosure - Related Party Transactions_Significant Loan Transactions With Related Parties(Details) Network

*

*

 http://www.kbfg.com/role/RelatedPartyTransactionsSignificantLoanTransactionsWithRelatedPartiesDetails
4308 Disclosure Of Significant Loan Transactions Between Related Parties Table [Table] Table

*

*

 kb:DisclosureOfSignificantLoanTransactionsBetweenRelatedPartiesTable
4309 Categories Of Related Parties Axis [Axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
4310 Entitys Total For Related Parties Member [Domain] Member ifrs-full:EntitysTotalForRelatedPartiesMember
4311 Associates Member ifrs-full:RelatedPartiesMember
4312 KB Insurance Co., Ltd. Member kb:KBInsuranceCoLtdMember
4313 Korea Credit Bureau Co., Ltd. Member kb:KoreaCreditBureauCoLtdMember
4314 UAMCO., Ltd. Member kb:UAMCOLtdMember
4315 Incheon Bridge Co., Ltd. Member kb:IncheonBridgeCoLtdMember
4316 Jaeyang Industry Co., Ltd. Member kb:JaeyangIndustryCoLtdMember
4317 HIMS Co., Ltd. Member kb:HIMSCoLtdMember
4318 KB Star Office Private Real Estate Investment Trust No.1 Member kb:KBStarofficePrivaterealestateInvestmentTrustNo1Member
4319 RAND Bio Science Co., Ltd. Member kb:RANDBioScienceCoLtdMember
4320 Inno Lending Co., Ltd. Member kb:InnoLendingCoLtdMember
4321 SY Auto Capital Co., Ltd. Member kb:SYAutoCapitalCoLtdMember
4322 Food Factory Co., Ltd. Member kb:FoodFactoryCoLtdMember
4323 Builton Co., Ltd. Member kb:BuiltonCoLtdMember
4324 Bungaejanter. Inc. Member kb:BungaejanterIncMember
4325 Big Dipper Co., Ltd. Member kb:BigDipperCoLtdMember
4326 KB No.5 Special Purpose Acquisition Company Member kb:KBNo5SpecialPurposeAcquisitionCompanyMember
4327 KB No.6 Special Purpose Acquisition Company Member kb:KBNo6SpecialPurposeAcquisitionCompanyMember
4328 KB No.7 Special Purpose Acquisition Company Member kb:KBNo7SpecialPurposeAcquisitionCompanyMember
4329 KB No.8 Special Purpose Acquisition Company Member kb:KBNo8SpecialPurposeAcquisitionCompanyMember
4330 KB No.9 Special Purpose Acquisition Company Member kb:KBNo9SpecialPurposeAcquisitionCompanyMember
4331 KB No.10 Special Purpose Acquisition Company Member kb:KBNo10SpecialPurposeAcquisitionCompanyMember
4332 KB No.11 Special Purpose Acquisition Company Member kb:KBNo11SpecialPurposeAcquisitionCompanyMember
4333 Disclosure Of Significant Loan Transactions Between Related Parties Line Items [Line Items] LineItems kb:DisclosureOfSignificantLoanTransactionsBetweenRelatedPartiesLineItems
4334 Loans And Receivables Gross Amount Related Party Transactions Abstract [Abstract] Abstract kb:LoansAndReceivablesGrossAmountRelatedPartyTransactionsAbstract
4335 Beginning Concept (Monetary) As Of Debit kb:LoansAndReceivablesGrossAmountRelatedPartyTransactions
4336 Loans Concept (Monetary) For Period Debit kb:IncreaseInSignificantLoansAndReceivablesGrossAmountRelatedPartyTransactions
4337 Repayments Concept (Monetary) For Period Credit kb:RepaymentsInSignificantLoansAndReceivablesGrossAmountRelatedPartyTransactions
4338 Others Concept (Monetary) For Period Debit kb:OtherChangesInSignificantLoansAndReceivablesGrossAmountRelatedPartyTransactions
4339 Ending Concept (Monetary) As Of Debit kb:LoansAndReceivablesGrossAmountRelatedPartyTransactions
4340 Description Of Other Information Of Loans And Receivables Gross Amount Related Party Transactions Concept (Text/String) For Period kb:DescriptionOfOtherInformationOfLoansAndReceivablesGrossAmountRelatedPartyTransactions
4341 24430103 - Disclosure - Related Party Transactions_Unused Commitments To Related Parties(Details) Network

*

*

 http://www.kbfg.com/role/RelatedPartyTransactionsUnusedCommitmentsToRelatedPartiesDetails
4342 Disclosure Of Unused Commitments To Related Parties Table [Table] Table

*

*

 kb:DisclosureOfUnusedCommitmentsToRelatedPartiesTable
4343 Categories Of Related Parties Axis [Axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
4344 Entitys Total For Related Parties Member [Domain] Member ifrs-full:EntitysTotalForRelatedPartiesMember
4345 Related Parties Member [Member] Member ifrs-full:RelatedPartiesMember
4346 Associates and Joint Ventures Member ifrs-full:AssociatesMember
4347 KB Insurance Co., Ltd. Member kb:KBInsuranceCoLtdMember
4348 Balhae Infrastructure Fund Member kb:BalhaeInfrastructureFundMember
4349 Korea Credit Bureau Co., Ltd. Member kb:KoreaCreditBureauCoLtdMember
4350 KoFC KBIC Frontier Champ 2010-5(PEF) Member kb:KoFCKBICFrontierChamp20105PEFMember
4351 KB GwS Private Securities Investment Trust Member kb:KBGwSPrivateSecuritiesInvestmentTrustMember
4352 Aju Good Technology Venture Fund Member kb:AjuGoodTechnologyVentureFundMember
4353 Incheon Bridge Co., Ltd. Member kb:IncheonBridgeCoLtdMember
4354 KoFC POSCO HANHWA KB Shared Growth Private Equity Fund No. 2 Member kb:KoFCPOSCOHANHWAKBSharedGrowthPrivateEquityFundNo2Member
4355 SY Auto Capital Co., Ltd. Member kb:SYAutoCapitalCoLtdMember
4356 isMedia Co., Ltd. Member kb:IsMediaCoLtdMember
4357 KB No.9 Special Purpose Acquisition Company Member kb:KBNo9SpecialPurposeAcquisitionCompanyMember
4358 KB No.10 Special Purpose Acquisition Company Member kb:KBNo10SpecialPurposeAcquisitionCompanyMember
4359 RAND Bio Science Co., Ltd. Member kb:RANDBioScienceCoLtdMember
4360 Builton Co., Ltd. Member kb:BuiltonCoLtdMember
4361 Food Factory Co., Ltd. Member kb:FoodFactoryCoLtdMember
4362 Inno Lending Co., Ltd. Member kb:InnoLendingCoLtdMember
4363 Big Dipper Co., Ltd. Member kb:BigDipperCoLtdMember
4364 KB-KDBC New Technology Business Investment Fund Member kb:KBKDBCNewTechnologyBusinessFundMember
4365 Key management Member ifrs-full:KeyManagementPersonnelOfEntityOrParentMember
4366 Disclosure Of Unused Commitments To Related Parties Line Items [Line Items] LineItems kb:DisclosureOfUnusedCommitmentsToRelatedPartiesLineItems
4367 Loan commitments in Korean won Concept (Monetary) As Of Credit kb:LoanCommitmentsInKoreanWonToRelatedParties
4368 Commitments of derivative financial instruments Concept (Monetary) As Of Credit kb:CommitmentsOfDerivativeFinancialInstrumentsToRelatedParties
4369 Unused commitments of credit card Concept (Monetary) As Of Credit kb:UnusedCommitmentsOfCreditCardToRelatedParties
4370 Purchase of security investment Concept (Monetary) As Of Debit kb:PurchaseOfSecurityInvestmentToRelatedParties
4371 24430104 - Disclosure - Related Party Transactions_Compensation To Key Management(Details) Network

*

*

 http://www.kbfg.com/role/RelatedPartyTransactionsCompensationToKeyManagementDetails
4372 Disclosure Of Amounts Incurred By Entity For Provision Of Key Management Personnel Services Provided By Separate Management Entities Table [Table] Table

*

*

 ifrs-full:DisclosureOfAmountsIncurredByEntityForProvisionOfKeyManagementPersonnelServicesProvidedBySeparateManagementEntitiesTable
4373 Separate Management Entities Axis [Axis] Axis ifrs-full:SeparateManagementEntitiesAxis
4374 Separate Management Entities Member[Domain] Member ifrs-full:SeparateManagementEntitiesMember
4375 Registered directors (executive) Member kb:RegisteredDirectorsExecutiveMember
4376 Registered directors (non-executive) Member kb:RegisteredDirectorsNonExecutiveMember
4377 Non-registered directors Member kb:NonRegisteredDirectorsMember
4378 Disclosure Of Amounts Incurred By Entity For Provision Of Key Management Personnel Services Provided By Separate Management Entities Line Items [Line Items] LineItems ifrs-full:DisclosureOfAmountsIncurredByEntityForProvisionOfKeyManagementPersonnelServicesProvidedBySeparateManagementEntitiesLineItems
4379 Short-term employee benefits Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationShorttermEmployeeBenefits
4380 Post-employment benefits Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationPostemploymentBenefits
4381 Termination benefits Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationTerminationBenefits
4382 Share-based payments Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationSharebasedPayment
4383 Total Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensation
4384 24430105 - Disclosure - Related Party Transactions_Details Of Assets Pledged As Collateral To Related Parties(Details) Network

*

*

 http://www.kbfg.com/role/RelatedPartyTransactionsDetailsOfAssetsPledgedAsCollateralToRelatedPartiesDetails
4385 Details Of Assets Pledged As Collateral To Related Parties Table [Table] Table

*

*

 kb:DetailsOfAssetsPledgedAsCollateralToRelatedPartiesTable
4386 Categories Of Related Parties Axis [Axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
4387 Entitys Total For Related Parties Member [Domain] Member ifrs-full:EntitysTotalForRelatedPartiesMember
4388 Related Parties Member [Member] Member ifrs-full:RelatedPartiesMember
4389 Associates Member [Member] Member ifrs-full:AssociatesMember
4390 KB Insurance Co., Ltd. Member kb:KBInsuranceCoLtdMember
4391 Collateral Axis [Axis] Axis us-gaap:CollateralAxis
4392 Collateral Domain [Domain] Member us-gaap:CollateralDomain
4393 Land and buildings Member us-gaap:RealEstateMember
4394 Investment securities Member us-gaap:EquitySecuritiesMember
4395 Details Of Assets Pledged As Collateral To Related Parties Line Items [Line Items] LineItems kb:DetailsOfAssetsPledgedAsCollateralToRelatedPartiesLineItems
4396 Carrying amount Concept (Monetary) As Of Credit kb:CarryingAmountOfGuaranteesOrCollateralToEntityRelatedPartyTransactions
4397 Collateralized amount Concept (Monetary) For Period ifrs-full:ProvisionOfGuaranteesOrCollateralByEntityRelatedPartyTransactions
4398 24430106 - Disclosure - Related Party Transactions_Collateral Received From Related Parties(Details) Network

*

*

 http://www.kbfg.com/role/RelatedPartyTransactionsCollateralReceivedFromRelatedPartiesDetails
4399 Details Of Collateral Received From Related Parties Table [Table] Table

*

*

 kb:DetailsOfCollateralReceivedFromRelatedPartiesTable
4400 Categories Of Related Parties Axis [Axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
4401 Entitys Total For Related Parties Member [Domain] Member ifrs-full:EntitysTotalForRelatedPartiesMember
4402 Related Parties Member [Member] Member ifrs-full:RelatedPartiesMember
4403 Associates Member [Member] Member ifrs-full:AssociatesMember
4404 KB Insurance Co., Ltd. Member kb:KBInsuranceCoLtdMember
4405 KB Star Office Private Real Estate Investment Trust No.1 Member kb:KBStarofficePrivaterealestateInvestmentTrustNo1Member
4406 Incheon Bridge Co., Ltd. Member kb:IncheonBridgeCoLtdMember
4407 Key management Member ifrs-full:KeyManagementPersonnelOfEntityOrParentMember
4408 Collateral Axis [Axis] Axis us-gaap:CollateralAxis
4409 Collateral Domain [Domain] Member us-gaap:CollateralDomain
4410 Investment securities Member us-gaap:EquitySecuritiesMember
4411 Time deposits and others Member kb:TimeDepositAndOthersMember
4412 Land and buildings Member us-gaap:RealEstateMember
4413 Details Of Collateral Received From Related Parties Line Items [Line Items] LineItems kb:DetailsOfCollateralReceivedFromRelatedPartiesLineItems
4414 Provision Of Guarantees Or Collateral To Entity Related Party Transactions Concept (Monetary) For Period ifrs-full:ProvisionOfGuaranteesOrCollateralToEntityRelatedPartyTransactions
4415 Description Of Other Collateral By Entity Related Party Transactions Concept (Text/String) For Period kb:DescriptionOfOtherCollateralByEntityRelatedPartyTransactions
4416 senior collateral Concept (Monetary) As Of Debit kb:SeniorCollateralByEntityRelatedPartyTransactions
4417 subordinated collateral Concept (Monetary) As Of Debit kb:SubordinatedCollateralByEntityRelatedPartyTransactions
4418 certificate of credit guarantee Concept (Monetary) As Of Debit kb:CertificateOfCreditGuaranteeByEntityRelatedPartyTransactions
4419 24440101 - Disclosure - Business Combination_Summarizes The Consideration Paid For Business Combination And The Fair Value Of Assets Acquired Liabilities Assumed(Details) Network

*

*

 http://www.kbfg.com/role/BusinessCombinationSummarizesTheConsiderationPaidForBusinessCombinationAndTheFairValueOfAssetsAcquiredLiabilitiesAssumedDetails
4420 Disclosure Of Business Combinations Table [Table] Table

*

*

 ifrs-full:DisclosureOfBusinessCombinationsTable
4421 Business Combinations Axis [Axis] Axis ifrs-full:BusinessCombinationsAxis
4422 Entitys Total For Business Combinations Member [Domain] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
4423 KB Insurance Co., Ltd. Member kb:KBInsuranceCoLtdMember
4424 Maritime Securities Incorpoation Member kb:MaritimeSecuritiesIncorpoationMember
4425 Balance Sheet Location Axis [Axis] Axis us-gaap:BalanceSheetLocationAxis
4426 Balance Sheet Location Domain [Domain] Member us-gaap:BalanceSheetLocationDomain
4427 Other Assets Member [Member] Member ifrs-full:OtherAssetsMember
4428 Cash and due from financial institutions Member kb:CashAndDueFromFinancialInstitutionMember
4429 Financial assets at fair value through profit or loss Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember
4430 Available-for-sale financial assets Member ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
4431 Held-to-maturity financial assets Member ifrs-full:HeldtomaturityInvestmentsCategoryMember
4432 Loans Member us-gaap:LoansMember
4433 Other receivables Member kb:OtherReceivablesMember
4434 Property plant and equipment(included Investment property) Member ifrs-full:OtherPropertyPlantAndEquipmentMember
4435 Intangible assets Member kb:IntangibleAssetsMember
4436 Value of business acquired (VOBA) Member ifrs-full:ValueOfBusinessAcquiredMember
4437 Others Member ifrs-full:OtherIntangibleAssetsMember
4438 Other assets Member us-gaap:OtherNoncurrentAssetsMember
4439 Other Liabilities Member [Member] Member us-gaap:OtherLiabilitiesMember
4440 Insurance contract liabilities Member kb:InsuranceContractLiabilitiesMember
4441 Financial liabilities Member kb:OtherFinancialLiabilitiesMember
4442 Other liabilities Member us-gaap:OtherNoncurrentLiabilitiesMember
4443 Total identifiable net assets Member kb:NetAssetsMember
4444 Disclosure Of Business Combinations Line Items [Line Items] LineItems ifrs-full:DisclosureOfBusinessCombinationsLineItems
4445 Name of acquiree Concept (Text/String) For Period ifrs-full:NameOfAcquiree
4446 Date of acquisition Concept (Date) For Period ifrs-full:DateOfAcquisition2013
4447 Percentage of voting equity interests acquired Concept (Percent) As Of ifrs-full:PercentageOfVotingEquityInterestsAcquired
4448 Percentage Of Voting Equity Interests Before Acquired Concept (Percent) As Of kb:PercentageOfVotingEquityInterestsBeforeAcquired
4449 Description Of How Acquirer Obtained Control Of Acquiree Concept (Text/String) For Period ifrs-full:DescriptionOfHowAcquirerObtainedControlOfAcquiree
4450 Acquisitiondate Fair Value Of Total Consideration Transferred Abstract [Abstract] Abstract ifrs-full:AcquisitiondateFairValueOfTotalConsiderationTransferredAbstract
4451 Fair value of existing holdings at the time of stock exchange Concept (Monetary) As Of Credit ifrs-full:OtherTangibleOrIntangibleAssetsTransferred
4452 Equity securities(=36,237,649 shares X 33,000) Concept (Monetary) As Of Credit ifrs-full:EquityInterestsOfAcquirer
4453 Number Of Instruments Or Interests Issued Or Issuable Concept (Decimal) As Of ifrs-full:NumberOfInstrumentsOrInterestsIssuedOrIssuable
4454 Share Price Of Instruments Or Interests Issued Or Issuable Concept (Percent) For Period kb:SharePriceOfInstrumentsOrInterestsIssuedOrIssuable
4455 Total consideration transferred Concept (Monetary) As Of Credit ifrs-full:AcquisitiondateFairValueOfTotalConsiderationTransferred
4456 Recognized amounts of identifiable assets acquired and liabilities assumed Abstract ifrs-full:AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract
4457 Financial Assets Recognised As Of Acquisition Date Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsRecognisedAsOfAcquisitionDate
4458 Property plant and equipment(included Investment property) Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate
4459 Intangible assets Concept (Monetary) As Of Debit ifrs-full:IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate
4460 Description Of Valuation Techniques And Key Model Inputs Used For Determining Intangible Assets Measured At Fair Value Concept (Text/String) For Period kb:DescriptionOfValuationTechniquesAndKeyModelInputsUsedForDeterminingIntangibleAssetsMeasuredAtFairValue
4461 Description Of Details Of Other Intangible Assets Recognised As Of Acquisition Date Concept (Text/String) For Period kb:DescriptionOfDetailsOfOtherIntangibleAssetsRecognisedAsOfAcquisitionDate
4462 Other assets Concept (Monetary) As Of Debit kb:OtherAssetsRecognisedAsOfAcquisitionDate
4463 Insurance contract liabilities Concept (Monetary) As Of Credit kb:InsuranceLiabilitiesRecognisedAsOfAcquisitionDate
4464 Financial liabilities Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesRecognisedAsOfAcquisitionDate
4465 Other liabilities Concept (Monetary) As Of Credit kb:OtherLiabilitiesRecognisedAsOfAcquisitionDate
4466 Total identifiable net assets Concept (Monetary) As Of Debit ifrs-full:IdentifiableAssetsAcquiredLiabilitiesAssumed
4467 Non-controlling interests Concept (Monetary) As Of Credit ifrs-full:NoncontrollingInterestInAcquireeRecognisedAtAcquisitionDate
4468 Gains on bargain purchase Concept (Monetary) For Period Credit ifrs-full:GainRecognisedInBargainPurchaseTransaction
4469 good will Concept (Monetary) For Period Debit ifrs-full:ChangesInGoodwill
4470 Explanation Of Amount Of Any Gain Recognised And Line Item In Statement Of Comprehensive Income In Which Gain Is Recognised In Bargain Purchase Concept (Text/String) For Period ifrs-full:ExplanationOfAmountOfAnyGainRecognisedAndLineItemInStatementOfComprehensiveIncomeInWhichGainIsRecognisedInBargainPurchase
4471 Gain Loss Recognised As Result Of Remeasuring To Fair Value Equity Interest In Acquiree Held By Acquirer Before Business Combination Concept (Monetary) For Period Credit ifrs-full:GainLossRecognisedAsResultOfRemeasuringToFairValueEquityInterestInAcquireeHeldByAcquirerBeforeBusinessCombination
4472 Explanation Of Gain Or Loss That Relates To Identifiable Assets Acquired Or Liabilities Assumed In Business Combination Concept (Text/String) For Period ifrs-full:ExplanationOfGainOrLossThatRelatesToIdentifiableAssetsAcquiredOrLiabilitiesAssumedInBusinessCombination
4473 Description Of Nature And Financial Effect Of Business Combinations During Period Concept (Text/String) For Period ifrs-full:DescriptionOfNatureAndFinancialEffectOfBusinessCombinationsDuringPeriod
4474 Operating income (expense) after acquisition date Concept (Monetary) For Period Credit kb:OperatingIncomeExpenseAfterAcquisitionDate
4475 Profit (loss) of acquiree since acquisition date Concept (Monetary) For Period Credit ifrs-full:ProfitLossOfAcquiree
4476 Additional Information About Nature And Financial Effect Of Business Combination Concept (Text/String) For Period ifrs-full:AdditionalInformationAboutNatureAndFinancialEffectOfBusinessCombination
4477 Operating income (expense) of combined entity as if combination occurred at beginning of period Concept (Monetary) For Period Credit kb:OperatingIncomeExpenseOfCombinedEntityAsIfCombinationOccurredAtBeginningOfPeriod
4478 Profit (loss) of combined entity as if combination occurred at beginning of period Concept (Monetary) For Period Credit ifrs-full:ProfitLossOfCombinedEntity
4479 24440102 - Disclosure - Business Combination_Details Of Loans Acquired(Details) Network

*

*

 http://www.kbfg.com/role/BusinessCombinationDetailsOfLoansAcquiredDetails
4480 Disclosure Of Acquired Receivables Table [Table] Table

*

*

 ifrs-full:DisclosureOfAcquiredReceivablesTable
4481 Business Combinations Axis [Axis] Axis ifrs-full:BusinessCombinationsAxis
4482 Entitys Total For Business Combinations Member [Domain] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
4483 KB Insurance Co., Ltd. Member kb:KBInsuranceCoLtdMember
4484 Disclosure Of Acquired Receivables Line Items [Line Items] LineItems ifrs-full:DisclosureOfAcquiredReceivablesLineItems
4485 Fair value of loans Concept (Monetary) As Of Debit ifrs-full:FairValueOfAcquiredReceivables
4486 Contractual total amount of loan receivables Concept (Monetary) As Of Debit ifrs-full:GrossContractualAmountsReceivableForAcquiredReceivables
4487 Contractual cash flows that are not expected to be recovered Concept (Monetary) As Of Debit ifrs-full:BestEstimateAtAcquisitionDateOfContractualCashFlowsNotExpectedToBeCollectedForAcquiredReceivables
4488 24440201 - Disclosure - Business Combination_The Results of VOBA Sensitivity Analysis(Details) Network

*

*

 http://www.kbfg.com/role/BusinessCombinationTheResultsOfVOBASensitivityAnalysisDetails
4489 Disclosure Of Results Of VOBA Sensitivity Analysis Table[Table] Table

*

*

 kb:DisclosureOfResultsOfVOBASensitivityAnalysisTable
4490 Type Of Assumptions For VOBA Sensitivity Analysis Axis[Axis] Axis kb:TypeOfAssumptionsForVOBASensitivityAnalysisAxis
4491 Type Of Assumptions VOBA Member[Domain] Member kb:TypeOfAssumptionsVOBAMember
4492 Value of business acquired (VOBA) Member ifrs-full:ValueOfBusinessAcquiredMember
4493 Surrenders and termination rates Member kb:RateOfSurrenderValueMember
4494 Loss ratio Member kb:LossRatioMember
4495 Insurance operating expenses ratio Member kb:ExpenseRatioMember
4496 Return on investment Member kb:ReturnOnInvestmentMember
4497 Discount rate Member kb:DiscountRateMember
4498 Range Axis [Axis] Axis ifrs-full:RangeAxis
4499 Ranges Member [Domain] Member ifrs-full:RangesMember
4500 Bottom Of Range Member [Member] Member ifrs-full:BottomOfRangeMember
4501 Top Of Range Member [Member] Member ifrs-full:TopOfRangeMember
4502 Disclosure Of Results Of VOBA Sensitivity Analysis LineItems[Line Items] LineItems kb:DisclosureOfResultsOfVOBASensitivityAnalysisLineItems
4503 Assumption change Concept (Percent) For Period kb:AssumptionsChangeForVOBASensitivityAnalysis
4504 VOBA outputs Concept (Monetary) For Period Debit us-gaap:AmortizationOfValueOfBusinessAcquiredVOBA
4505 Gain or losses from evaluation Concept (Monetary) For Period Credit kb:GainOrLossFromAssumptionsChangeForVOBASensitivityAnalysis
4506 24440301 - Disclosure - Business Combination_Exposure To Insurance Price Risk(Details) Network

*

*

 http://www.kbfg.com/role/BusinessCombinationExposureToInsurancePriceRiskDetails
4507 Disclosure Of Non LifeInsurance Price Risk At The Time Of Business CombinationTable[Table] Table

*

*

 kb:DisclosureOfNonLifeInsurancePriceRiskAtTheTimeOfBusinessCombinationTable
4508 Types Of Insurance Contracts Axis [Axis] Axis ifrs-full:TypesOfInsuranceContractsAxis
4509 Insurance Contracts Member [Domain] Member ifrs-full:InsuranceContractsMember
4510 Non-life insurance Member ifrs-full:NonlifeInsuranceContractsMember
4511 General Insurance Member kb:GeneralInsuranceMember
4512 Automobile insurance Member kb:AutomobileInsuranceMember
4513 Long-term Insurance Member kb:LongTermInsuranceMember
4514 Disclosure Of Non Life Insurance Price Risk At The Time Of Business Combination LineItems[Line Items] LineItems kb:DisclosureOfNonLifeInsurancePriceRiskAtTheTimeOfBusinessCombinationLineItems
4515 Direct insurance Concept (Monetary) As Of Credit kb:MaxiumumExposureOfInsurancePriceRiskBeforeReinsurance
4516 Inward reinsurance Concept (Monetary) As Of Credit kb:MaxiumumExposureOfInsurancePriceRiskInwardReinsurance
4517 Outward reinsurance Concept (Monetary) As Of Credit kb:MaxiumumExposureOfInsurancePriceRiskOutwardReinsurance
4518 Total Concept (Monetary) As Of Credit kb:MaxiumumExposureOfInsurancePriceRiskAfterReinsurance
4519 24440302 - Disclosure - Business Combination_Losss Development Tables(Details) Network

*

*

 http://www.kbfg.com/role/BusinessCombinationLosssDevelopmentTablesDetails
4520 Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability Table[Table] Table

*

*

 us-gaap:ShortdurationInsuranceContractsReconciliationOfClaimsDevelopmentToLiabilityTable
4521 Types Of Insurance Contracts Axis [Axis] Axis ifrs-full:TypesOfInsuranceContractsAxis
4522 Insurance Contracts Member [Domain] Member ifrs-full:InsuranceContractsMember
4523 Non-life insurance Member ifrs-full:NonlifeInsuranceContractsMember
4524 General Insurance Member kb:GeneralInsuranceMember
4525 Automobile insurance Member kb:AutomobileInsuranceMember
4526 Long-term Insurance Member kb:LongTermInsuranceMember
4527 Shortduration Insurance Contracts Accident Year Axis[Axis] Axis us-gaap:ShortdurationInsuranceContractsAccidentYearAxis
4528 Accident year Member us-gaap:ShortdurationInsuranceContractsAccidentYearDomain
4529 2010.4.1 ~ 2011.3.31 Member us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member
4530 2011.4.1 ~ 2012.3.31 Member us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member
4531 2012.4.1 ~ 2013.3.31 Member us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member
4532 2013.4.1 ~ 2014.3.31 Member us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member
4533 2014.4.1 ~ 2015.3.31 Member us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member
4534 2015.4.1 ~ 2016.3.31 Member us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member
4535 2016.4.1 ~ 2017.3.31 Member us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member
4536 Shortduration Insuranc eContracts Claim Duration Axis[Axis] Axis us-gaap:ShortdurationInsuranceContractsClaimDurationAxis
4537 Payment year Member us-gaap:ShortdurationInsuranceContractsClaimDurationDomain
4538 After 1 year Member kb:ShortdurationInsuranceContractsClaimDurationAfter1YearMember
4539 After 2 year Member kb:ShortdurationInsuranceContractsClaimDurationAfter2YearMember
4540 After 3 year Member kb:ShortdurationInsuranceContractsClaimDurationAfter3YearMember
4541 After 4 year Member kb:ShortdurationInsuranceContractsClaimDurationAfter4YearMember
4542 After 5 year Member kb:ShortdurationInsuranceContractsClaimDurationAfter5YearMember
4543 After 6 year Member kb:ShortdurationInsuranceContractsClaimDurationAfter6YearMember
4544 After 7 year Member kb:ShortdurationInsuranceContractsClaimDurationAfter7YearMember
4545 Shortduration Insurance Contracts Reconciliation Of ClaimsDevelopmentToLiability At The Time Of Business Combination LineItems[Line Items] LineItems kb:ShortdurationInsuranceContractsReconciliationOfClaimsDevelopmentToLiabilityAtTheTimeOfBusinessCombinationLineItems
4546 Estimate of gross ultimate claims (A) Concept (Monetary) As Of Credit kb:ShortdurationInsuranceContractsEstimatedCumulativeClaimsAndAllocatedClaimAdjustmentExpenseNet
4547 Gross cumulative claim payments (B) Concept (Monetary) As Of Debit us-gaap:ShortdurationInsuranceContractsCumulativePaidClaimsAndAllocatedClaimAdjustmentExpenseNet
4548 Difference (A-B) Concept (Monetary) As Of Debit kb:ShortdurationInsuranceContractsDifferenceBetweenEsimatedCumulativeClaimsAndCumulativePaidClaims
4549 24440303 - Disclosure - Business Combination_Liquidity Risk Of Insurance Contracts(Details) Network

*

*

 http://www.kbfg.com/role/BusinessCombinationLiquidityRiskOfInsuranceContractsDetails
4550 Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity[Table] Table

*

*

 kb:DisclosureOfNonLifeInsurancePremiumReservesBasedOnEachResidualMaturityTable
4551 Maturity Axis [Axis] Axis ifrs-full:MaturityAxis
4552 Aggregated Time Bands Member [Domain] Member ifrs-full:AggregatedTimeBandsMember
4553 Within 1 year Member ifrs-full:NotLaterThanOneYearMember
4554 1~5 years Member ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember
4555 5~10 years Member ifrs-full:LaterThanFiveYearsAndNotLaterThanTenYearsMember
4556 10~20 years Member kb:LaterThanTenYearsAndNotLaterThanTwentyYearsMember
4557 More 20 years Member kb:LaterThanTwentyYearsMember
4558 Types Of Insurance Contracts Axis [Axis] Axis ifrs-full:TypesOfInsuranceContractsAxis
4559 Insurance Contracts Member [Domain] Member ifrs-full:InsuranceContractsMember
4560 Non-life insurance contracts [Member] Member ifrs-full:NonlifeInsuranceContractsMember
4561 Long-term insurance non participating Member kb:LongTermInsuranceNonParticipatingMember
4562 Annuity Member kb:AnnuityInsuranceMember
4563 Asset-linked Member kb:AssetLinkedInsuranceMember
4564 Types Of Interest[Axis] Axis kb:TypesOfInterestAxis
4565 Type Of Interest Member[Domain] Member kb:TypeOfInterestMember
4566 Non-linked Member kb:NonLinkedInterestMember
4567 Linked Member kb:LinkedInterestMember
4568 Disclosure Of Non Life Insurance Premium Reserves Based On Each Residual Maturity At TheTime Of Business Combination LineItems [Line Items] LineItems kb:DisclosureOfNonLifeInsurancePremiumReservesBasedOnEachResidualMaturityAtTheTimeOfBusinessCombinationLineItems
4569 Premium reserves Concept (Monetary) As Of Credit kb:PremuimReserves
4570 24440304 - Disclosure - Business Combination_Credit Risk Of Insurance Contracts(Details) Network

*

*

 http://www.kbfg.com/role/BusinessCombinationCreditRiskOfInsuranceContractsDetails
4571 Ceded Credit Risk Table[Table] Table

*

*

 us-gaap:CededCreditRiskTable
4572 Types Of Insurance Contracts Axis [Axis] Axis ifrs-full:TypesOfInsuranceContractsAxis
4573 Total Member ifrs-full:InsuranceContractsMember
4574 Non-life insurance Member ifrs-full:NonlifeInsuranceContractsMember
4575 Ceded Credit Risk Axis[Axis] Axis us-gaap:CededCreditRiskAxis
4576 Reinsurance company Member us-gaap:CededCreditRiskReinsurerDomain
4577 KOREANRE Member kb:KOREANREMember
4578 STARR INTERNATIONAL Member kb:STARRINTERNATIONALMember
4579 SWISSREREINSURANCE Member kb:SWISSREMember
4580 Credit Rating Standard Poors Axis[Axis] Axis us-gaap:CreditRatingStandardPoorsAxis
4581 External Credit Rating Standard Poors Member [Domain] Member us-gaap:ExternalCreditRatingStandardPoorsMember
4582 AA Member us-gaap:StandardPoorsAARatingMember
4583 AAA Member us-gaap:StandardPoorsAAARatingMember
4584 AA+ Member us-gaap:StandardPoorsAAPlusRatingMember
4585 Ceded Credit Risk LineItems[Line Items] LineItems us-gaap:CededCreditRiskLineItems
4586 Concentration Risk Percentage1 At The Time Of Business Combination Concept (Percent) As Of kb:ConcentrationRiskPercentage1AtTheTimeOfBusinessCombination
4587 Reinsuance assets Concept (Monetary) As Of Debit kb:NonLifeReinsuranceAssetsWithoutImpairmnetLoss
4588 Net receivables from reinsurers Concept (Monetary) As Of Debit us-gaap:ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments
4589 Total Concept (Monetary) As Of Debit us-gaap:ReinsuranceRecoverables
4590 24440305 - Disclosure - Business Combination_Exposure To Interest Rate risk Of Insurance Contracts(Details) Network

*

*

 http://www.kbfg.com/role/BusinessCombinationExposureToInterestRateriskOfInsuranceContractsDetails
4591 Disclosure Of Interest Risk Of Non Life Insurance Contract [Table] Table

*

*

 kb:DisclosureOfInterestRiskOfNonLifeInsuranceContractTable
4592 Types Of Insurance Contracts Axis [Axis] Axis ifrs-full:TypesOfInsuranceContractsAxis
4593 Insurance Contracts Member [Domain] Member ifrs-full:InsuranceContractsMember
4594 Non-life insurance Member ifrs-full:NonlifeInsuranceContractsMember
4595 Balance Sheet Location Axis [Axis] Axis us-gaap:BalanceSheetLocationAxis
4596 Balance Sheet Location Domain [Domain] Member us-gaap:BalanceSheetLocationDomain
4597 Financial assets Member ifrs-full:FinancialAssetsMember
4598 Due from banks Member kb:CashAndDueFromFinancialInstitutionMember
4599 Financial assets at fair value through profit or loss Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember
4600 Available-for-sale financial assets Member ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
4601 Held-to-maturity financial assets Member ifrs-full:HeldtomaturityInvestmentsCategoryMember
4602 Loans Member ifrs-full:LoansAndReceivablesCategoryMember
4603 Financial liabilities Member kb:OtherFinancialLiabilitiesMember
4604 Fixed interest rate Member ifrs-full:FixedInterestRateMember
4605 Variable interest rate Member ifrs-full:FloatingInterestRateMember
4606 Disclosure Of Interest Risk Of Non Life Insurance ContractAtTheTimeOfBusinessCombination [Line Items] LineItems kb:DisclosureOfInterestRiskOfNonLifeInsuranceContractAtTheTimeOfBusinessCombinationLineItems
4607 Exposure To Interest Rate Risk At The Time Of Business Combination Concept (Monetary) For Period Credit kb:ExposureToInterestRateRiskAtTheTimeOfBusinessCombination
4608 24450101 - Disclosure - Approval of Issuance of the Financial Statements_Authorisation For Issue Of Financial Statements(Details) Network

*

*

 http://www.kbfg.com/role/ApprovalOfIssuanceOfTheFinancialStatementsAuthorisationForIssueOfFinancialStatementsDetails
4609 Implied Table Table

*

*

 implied:Table
4610 Disclosure Of Authorisation For Issue Of Financial Statements Abstract [Abstract] Abstract kb:DisclosureOfAuthorisationForIssueOfFinancialStatementsAbstract
4611 Explanation Of Body Of Authorisation Concept (Text/String) For Period ifrs-full:ExplanationOfBodyOfAuthorisation
4612 Date Of Authorisation For Issue Of Financial Statements2013 Concept (Date) For Period ifrs-full:DateOfAuthorisationForIssueOfFinancialStatements2013
4613 24460101 - Disclosure - Parent Company Information_Condensed Statements Of Financial Position (Details) Network

*

*

 http://www.kbfg.com/role/ParentCompanyInformationCondensedStatementsOfFinancialPositionDetails
4614 Condensed Balance Sheet Statement Table [Table] Table

*

*

 us-gaap:CondensedBalanceSheetStatementTable
4615 Legal Entity Axis [Axis] Axis dei:LegalEntityAxis
4616 Entity Domain [Domain] Member dei:EntityDomain
4617 KB Financial Group Inc. Member kb:KBFinancialGroupIncMember
4618 Condensed Balance Sheet Statements Captions Line Items [Line Items] LineItems us-gaap:CondensedBalanceSheetStatementsCaptionsLineItems
4619 Total assets Abstract kb:AssetsOfParentCompanyAbstract
4620 Cash held at bank subsidiaries Concept (Monetary) As Of Debit kb:CashHeldAtBankSubsidiariesOfParentCompany
4621 Financial Assets at fair value through profit of loss Concept (Monetary) As Of Debit kb:FinancialAssetsAtFairValueThroughProfitOrLossOfParentCompany
4622 Loans Concept (Monetary) As Of Debit kb:LoansOfParentCompany
4623 Investments in subsidiaries Concept (Monetary) As Of Debit kb:InvestmentsInSubsidiariesOfParentCompany
4624 Banking subsidiaries Concept (Monetary) As Of Debit kb:InvestmentsInBankingSubsidiariesOfParentCompany
4625 Nonbanking subsidiaries Concept (Monetary) As Of Debit kb:InvestmentsInNonbankingSubsidiariesOfParentCompany
4626 Investments in associate Concept (Monetary) As Of Debit kb:InvestmentsInAssociateOfParentCompany
4627 Other assets Concept (Monetary) As Of Debit kb:OtherAssetsOfParentCompany
4628 Assets Of Parent Company Concept (Monetary) As Of Debit kb:AssetsOfParentCompany
4629 Total liabilities and shareholders’ equity Abstract kb:LiabilitiesAndShareholdersEquityOfParentCompanyAbstract
4630 Debts Concept (Monetary) As Of Credit kb:DebtsOfParentCompany
4631 Debentures Concept (Monetary) As Of Credit kb:DebenturesOfParentCompany
4632 Other liabilities Concept (Monetary) As Of Credit kb:OtherLiabilitiesOfParentCompany
4633 Shareholders' equity Concept (Monetary) As Of Credit kb:ShareholdersEquityOfParentCompany
4634 Liabilities And Shareholders Equity Of Parent Company Concept (Monetary) As Of Credit kb:LiabilitiesAndShareholdersEquityOfParentCompany
4635 24460102 - Disclosure - Parent Company Information_Condensed Statements Of Comprehensive Income (Details) Network

*

*

 http://www.kbfg.com/role/ParentCompanyInformationCondensedStatementsOfComprehensiveIncomeDetails
4636 Condensed Statement Of Comprehensive Income Table [Table] Table

*

*

 us-gaap:CondensedStatementOfComprehensiveIncomeTable
4637 Legal Entity Axis [Axis] Axis dei:LegalEntityAxis
4638 Entity Domain [Domain] Member dei:EntityDomain
4639 KB Financial Group Inc. Member kb:KBFinancialGroupIncMember
4640 Condensed Statement Of Income Captions Line Items [Line Items] LineItems us-gaap:CondensedStatementOfIncomeCaptionsLineItems
4641 Income Abstract kb:IncomeOfParentCompanyAbstract
4642 Dividends from subsidiaries Concept (Monetary) For Period Credit kb:DividendsFromSubsidiariesOfParentCompany
4643 Dividends from an associate Concept (Monetary) For Period Credit kb:DividendsFromAssociatesOfParentCompany
4644 Interest from subsidiaries Concept (Monetary) For Period Credit kb:InterestFromSubsidiariesOfParentCompany
4645 Other income Concept (Monetary) For Period Credit kb:OtherIncomeOfParentCompany
4646 Total income Concept (Monetary) For Period Credit kb:IncomeOfParentCompany
4647 Expense Abstract kb:ExpenseOfParentCompanyAbstract
4648 Interest expense Concept (Monetary) For Period Debit kb:InterestExpenseOfParentCompany
4649 Non-interest expense Concept (Monetary) For Period Debit kb:NonInterestExpenseOfParentCompany
4650 Total expense Concept (Monetary) For Period Debit kb:ExpenseOfParentCompany
4651 Profit(loss) before tax expense Concept (Monetary) For Period Credit kb:ProfitLossBeforeTaxExpenseOfParentCompany
4652 Tax Expense Income Of Parent Company Concept (Monetary) For Period Debit kb:TaxExpenseIncomeOfParentCompany
4653 Profit(loss) for the year Concept (Monetary) For Period Credit kb:ProfitLossOfParentCompany
4654 Other comprehensive income(loss) for the year, net of tax Concept (Monetary) For Period Credit kb:OtherComprehensiveIncomeLossForTheYearNetOfTaxOfParentCompany
4655 Total comprehensive income for the year Concept (Monetary) For Period Credit kb:ComprehensiveIncomeForTheYearOfParentCompany
4656 24460103 - Disclosure - Parent Company Information_Condensed Statements Of Cash Flows (Details) Network

*

*

 http://www.kbfg.com/role/ParentCompanyInformationCondensedStatementsOfCashFlowsDetails
4657 Condensed Cash Flow Statement Table [Table] Table

*

*

 us-gaap:CondensedCashFlowStatementTable
4658 Legal Entity Axis [Axis] Axis dei:LegalEntityAxis
4659 Entity Domain [Domain] Member dei:EntityDomain
4660 KB Financial Group Inc. Member kb:KBFinancialGroupIncMember
4661 Condensed Cash Flow Statements Captions Line Items [Line Items] LineItems us-gaap:CondensedCashFlowStatementsCaptionsLineItems
4662 Operating activities Abstract kb:CashFlowsFromUsedInOperatingActivitiesOfParentCompanyAbstract
4663 Net income Concept (Monetary) For Period Credit kb:ProfitLossOfParentCompany
4664 Reconciliation of net income (loss) to net cash provided by operating activities Abstract kb:AdjustmentsForReconcileProfitLossOfParentCompanyAbstract
4665 Other operating activities, net Concept (Monetary) For Period Credit kb:AdjustmentsForReconcileProfitLossOfParentCompany
4666 Net cash inflow (outflow) from operating activities Concept (Monetary) For Period kb:CashFlowsFromUsedInOperatingActivitiesOfParentCompany
4667 Investing activities Abstract kb:CashFlowsFromUsedInInvestingActivitiesOfParentCompanyAbstract
4668 Net payments from (to) subsidiaries Concept (Monetary) For Period Debit kb:NetPaymentsFromToSubsidiariesOfParentCompany
4669 Other investing activities, net Concept (Monetary) For Period Debit kb:OtherInvestingActivitiesNetOfParentCompany
4670 Net cash outflow from investing activities Concept (Monetary) For Period Debit kb:CashFlowsFromUsedInInvestingActivitiesOfParentCompany
4671 Financing activities Abstract kb:CashFlowsFromUsedInFinancingActivitiesOfParentCompanyAbstract
4672 Net increase(decrease) in debts Concept (Monetary) For Period Credit kb:IncreaseDecreaseInDebtsOfParentCompany
4673 Increases in debentures Concept (Monetary) For Period Credit kb:IncreasesInDebenturesOfParentCompany
4674 Repayments of debentures Concept (Monetary) For Period Credit kb:RepaymentsOfDebenturesOfParentCompany
4675 Cash dividends paid Concept (Monetary) For Period Credit kb:CashDividendsPaidOfParentCompany
4676 Acquisition of treasury shares Concept (Monetary) For Period Credit kb:AcquisitionOfTreasurySharesOfParentCompany
4677 Net cash inflow from financing activities Concept (Monetary) For Period Debit kb:CashFlowsFromUsedInFinancingActivitiesOfParentCompany
4678 Net increase in cash held at bank susidiaries Concept (Monetary) For Period Debit kb:IncreaseDecreaseInCashHeldAtBankSubsidiariesOfParentCompany
4679 Cash and cash equivalents subsidiaries at January 1 Concept (Monetary) As Of Debit kb:CashAndCashequivalentsOfParentCompany
4680 Cash and cash equivalents subsidiaries at December 31 Concept (Monetary) As Of Debit kb:CashAndCashequivalentsOfParentCompany

*

*