2.2.0.7 false Consolidated Statements of Cash Flows 0140 - Statement - Consolidated Statements of Cash Flows true false In Thousands false false 1 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ false 2 KRW false false KRW Standard http://www.xbrl.org/2003/iso4217 KRW iso4217 0 KRWEPS Divide http://www.xbrl.org/2003/iso4217 KRW iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 ₩ false 3 KRW false false KRW Standard http://www.xbrl.org/2003/iso4217 KRW iso4217 0 KRWEPS Divide http://www.xbrl.org/2003/iso4217 KRW iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 ₩ false 4 KRW false false KRW Standard http://www.xbrl.org/2003/iso4217 KRW iso4217 0 KRWEPS Divide http://www.xbrl.org/2003/iso4217 KRW iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 ₩ 3 Cash flows from operating activities: 1 us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities include all transactions and events that are not defined as investing or financing activities. Operating activities generally involve producing and delivering goods and providing services. Cash flows from operating activities are generally the cash effects of transactions and other events that enter into the determination of net income. false 4 Net income 2 us-gaap_ProfitLoss us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 true true false false 617512000 617512 false false false 2 true true false false 718569000000 718569000 false false false 3 true true false false 1332938000000 1332938000 false false false 4 true true false false 3759369000000 3759369000 false false false xbrli:monetaryItemType monetary The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A1, A4, A5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 5 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(1) false 5 Adjustments to reconcile net income to net cash provided by operating activities: 2 us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 6 Provision for credit losses 3 us-gaap_ProvisionForLoanLeaseAndOtherLosses us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 1894035000 1894035 false false false 2 false true false false 2203993000000 2203993000 false false false 3 false true false false 2313454000000 2313454000 false false false 4 false true false false 18374000000 18374000 false false false xbrli:monetaryItemType monetary The sum of the periodic provision charged to earnings, based on an assessment of uncollectibility from the counterparty on account of loan, lease or other credit losses, to reduce these accounts to the amount that approximates their net realizable value. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Chapter 5 -Paragraph 168, 169, 170 -IssueDate 2006-05-01 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9 false 7 Depreciation and amortization 3 us-gaap_DepreciationAndAmortization us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 370392000 370392 false false false 2 false true false false 431007000000 431007000 false false false 3 false true false false 407187000000 407187000 false false false 4 false true false false 418882000000 418882000 false false false xbrli:monetaryItemType monetary The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 false 8 Accretion of discounts on finance debentures 3 us-gaap_AmortizationOfDebtDiscountPremium us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 120282000 120282 false false false 2 false true false false 139967000000 139967000 false false false 3 false true false false 155458000000 155458000 false false false 4 false true false false 272511000000 272511000 false false false xbrli:monetaryItemType monetary The component of interest income or expense representing the periodic increase in or charge against earnings to reflect amortization of debt discounts and premiums over the life of the related debt instruments, which are liabilities of the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 false 9 Net loss (gain) on valuation of trading securities 3 us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false 32144000 32144 false false false 2 false true false false 37405000000 37405000 false false false 3 false true false false -74578000000 -74578000 false false false 4 false true false false 47890000000 47890000 false false false xbrli:monetaryItemType monetary For trading securities held as of the balance sheet date, this amount represents the difference between the fair value of trading securities and their carrying value (unrealized holding gain or loss). Trading securities are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) and such unrealized holding gain or loss is included in earnings for the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph a Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 21 -Subparagraph e false 10 Net loss (gain) on valuation of derivatives 3 us-gaap_UnrealizedGainLossOnDerivatives us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -608120000 -608120 false false false 2 false true false false -707639000000 -707639000 false false false 3 false true false false -652909000000 -652909000 false false false 4 false true false false 205628000000 205628000 false false false xbrli:monetaryItemType monetary The increases (decreases) in the market value of derivative instruments, including options, swaps, futures, and forward contracts, which were included in earnings in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 false 11 Net loss (gain) on transaction of derivatives 3 us-gaap_GainLossOnSaleOfDerivatives us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false 536950000 536950 false false false 2 false true false false 624822000000 624822000 false false false 3 false true false false 473307000000 473307000 false false false 4 false true false false -71265000000 -71265000 false false false xbrli:monetaryItemType monetary The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings . Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 false 12 Net gain on sales of available-for-sale securities 3 us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -142011000 -142011 false false false 2 false true false false -165251000000 -165251000 false false false 3 false true false false -16306000000 -16306000 false false false 4 false true false false -726845000000 -726845000 false false false xbrli:monetaryItemType monetary This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments of the subject investments in debt and equity securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 false 13 Impairment losses on available-for-sale securities 3 kb_ImpairmentLossesOnAvailableForSaleSecurities kb false debit duration Impairment losses on available-for-sale securities. false false false false false false false false false false false verboselabel false 1 false true false false 5730000 5730 false false false 2 false true false false 6667000000 6667000 false false false 3 false true false false 224925000000 224925000 false false false 4 false true false false 50467000000 50467000 false false false xbrli:monetaryItemType monetary Impairment losses on available-for-sale securities. No authoritative reference available. false 14 Net gain on redemption of available-for-sale securities 3 kb_NetGainLossOnRedemptionOfAvailableForSaleSecurities kb false credit duration Net gain on redemption of available-for-sale securities. false false false false false false false false false false true negated false 1 false true false false -10354000 -10354 false false false 2 false true false false -12049000000 -12049000 false false false 3 false true false false -43254000000 -43254000 false false false 4 false true false false -5017000000 -5017000 false false false xbrli:monetaryItemType monetary Net gain on redemption of available-for-sale securities. No authoritative reference available. false 15 Impairment losses on held-to-maturities securities 3 kb_ImpairmentLossesOnHeldToMaturitiesSecurities kb false debit duration Impairment losses on held-to-maturities securities. false false false false false false false false false false false verboselabel false 1 false true false false 7054000 7054 false false false 2 false true false false 8208000000 8208000 false false false 3 false true false false 17218000000 17218000 false false false 4 false true false false 8067000000 8067000 false false false xbrli:monetaryItemType monetary Impairment losses on held-to-maturities securities. No authoritative reference available. false 16 Net gain on redemption of held-to-maturities securities 3 kb_NetLossGainOnRedemptionOfHeldToMaturitiesSecurities kb false debit duration Net Loss Gain On Redemption Of Held-To-Maturities Securities. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false true false false -6000000 -6000000 false false false xbrli:monetaryItemType monetary Net Loss Gain On Redemption Of Held-To-Maturities Securities. No authoritative reference available. false 17 Income of equity method investments 3 us-gaap_IncomeLossFromEquityMethodInvestments us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -8749000 -8749 false false false 2 false true false false -10181000000 -10181000 false false false 3 false true false false 8673000000 8673000 false false false 4 false true false false -68183000000 -68183000 false false false xbrli:monetaryItemType monetary This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. Such amount typically reflects adjustments similar to those made in preparing consolidated statements, including adjustments to eliminate intercompany gains and losses, and to amortize, if appropriate, any difference between cost and underlying equity in net assets of the investee at the date of investment. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 19 -Subparagraph c Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 6 -Subparagraph b false 18 Loss (gain) on sales of equity method investments 3 us-gaap_GainLossOnSaleOfEquityMethodInvestments us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false 11932000 11932 false false false 2 false true false false 13885000000 13885000 false false false 3 false true false false -343660000000 -343660000 false false false 4 false true false false -143893000000 -143893000 false false false xbrli:monetaryItemType monetary The difference between the book value and the sale price of investments in joint ventures and entities in which the reporting entity has an equity ownership interest, generally of 20 to 50 percent, and exercises significant influence. This element refers to the non cash gain (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 false 19 Loss on impairment of other securities 3 kb_LossOnImpairmentOfOtherSecurities kb false debit duration Loss on impairment of other securities. false false false false false false false false false false false verboselabel false 1 false true false false 212000 212 false false false 2 false true false false 247000000 247000 false false false 3 false true false false 205681000000 205681000 false false false 4 false true false false 7367000000 7367000 false false false xbrli:monetaryItemType monetary Loss on impairment of other securities. No authoritative reference available. false 20 Net gain on other securities 3 kb_NetGainLossOnOtherSecurities kb false credit duration Net gain on other securities. false false false false false false false false false false true negated false 1 false true false false -94056000 -94056 false false false 2 false true false false -109448000000 -109448000 false false false 3 false true false false -143669000000 -143669000 false false false 4 false true false false -139271000000 -139271000 false false false xbrli:monetaryItemType monetary Net gain on other securities. No authoritative reference available. false 21 Net loss on fair value hedge accounting 3 us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false 14754000 14754 false false false 2 false true false false 17168000000 17168000 false false false 3 false true false false 27032000000 27032000 false false false 4 false true false false 224000000 224000 false false false xbrli:monetaryItemType monetary Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph a(1) false 22 Net loss (gain) on sales of loans 3 us-gaap_GainLossOnSalesOfLoansNet us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -42082000 -42082 false false false 2 false true false false -48969000000 -48969000 false false false 3 false true false false 3293000000 3293000 false false false 4 false true false false 455000000 455000 false false false xbrli:monetaryItemType monetary The net gain or loss resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes. No authoritative reference available. false 23 Net gain on disposal of premises and equipment 3 us-gaap_GainLossOnSaleOfPropertyPlantEquipment us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -2833000 -2833 false false false 2 false true false false -3297000000 -3297000 false false false 3 false true false false -3538000000 -3538000 false false false 4 false true false false -13067000000 -13067000 false false false xbrli:monetaryItemType monetary The difference between the sale price or salvage price and the book value of a property, plant, and equipment asset that was sold or retired during the reporting period. This element refers to the gain (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 false 24 Impairment loss on other assets 3 us-gaap_OtherAssetImpairmentCharges us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 2282000 2282 false false false 2 false true false false 2655000000 2655000 false false false 3 false true false false 2272000000 2272000 false false false 4 false true false false 1171000000 1171000 false false false xbrli:monetaryItemType monetary The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 false 25 Non-cash stock compensation expense 3 us-gaap_ShareBasedCompensation us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 19799000 19799 false false false 2 false true false false 23039000000 23039000 false false false 3 false true false false -20139000000 -20139000 false false false 4 false true false false 7513000000 7513000 false false false xbrli:monetaryItemType monetary The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock options, amortization of restricted stock, and adjustment for officers compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 false 26 Net change in: 3 us-gaap_IncreaseDecreaseInOperatingCapitalAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 27 Trading assets 4 us-gaap_IncreaseDecreaseInTradingSecurities us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false 4656441000 4656441 false false false 2 false true false false 5418467000000 5418467000 false false false 3 false true false false -6279966000000 -6279966000 false false false 4 false true false false -3032170000000 -3032170000 false false false xbrli:monetaryItemType monetary The net change during the reporting period in the aggregate market value of equity or debt securities that are purchased and held principally for the purpose of selling them in the near future and benefiting from increases in prices. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 102 -Paragraph 8 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 18 false 28 Accrued interest and dividend receivable 4 us-gaap_IncreaseDecreaseInInterestAndDividendsReceivable us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false 81138000 81138 false false false 2 false true false false 94416000000 94416000 false false false 3 false true false false -223467000000 -223467000 false false false 4 false true false false -96737000000 -96737000 false false false xbrli:monetaryItemType monetary The net change during the reporting period in the aggregate amount due to the Entity in the form of unpaid interest and dividends. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 false 29 Deferred income tax assets 4 us-gaap_IncreaseDecreaseInDeferredIncomeTaxes us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -10648000 -10648 false false false 2 false true false false -12390000000 -12390000 false false false 3 false false false false 0 0 false false false 4 false true false false 48376000000 48376000 false false false xbrli:monetaryItemType monetary The net change during the reporting period in the account that represents the temporary difference that results from income (loss) that is recognized for accounting purposes but not for tax purposes and vice versa. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 false 30 Income tax receivable 4 us-gaap_IncreaseDecreaseInIncomeTaxesReceivable us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false 154134000 154134 false false false 2 false true false false 179358000000 179358000 false false false 3 false true false false -42805000000 -42805000 false false false 4 false true false false -471317000000 -471317000 false false false xbrli:monetaryItemType monetary The net change during the reporting period in income taxes receivable, which represents the amount due from tax authorities for refunds of overpayments or recoveries of income taxes paid. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 false 31 Other assets 4 us-gaap_IncreaseDecreaseInOtherOperatingAssets us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false 660439000 660439 false false false 2 false true false false 768519000000 768519000 false false false 3 false true false false -761952000000 -761952000 false false false 4 false true false false -285181000000 -285181000 false false false xbrli:monetaryItemType monetary The net change during the reporting period in other operating assets not otherwise defined in the taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 false 32 Trading liabilities 4 us-gaap_IncreaseDecreaseInTradingLiabilities us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false -3390165000 -3390165 false false false 2 false true false false -3944966000000 -3944966000 false false false 3 false true false false 6506002000000 6506002000 false false false 4 false true false false 588721000000 588721000 false false false xbrli:monetaryItemType monetary The net change during the reporting period in the aggregate amount of trading liabilities from the reporting entity's trading activities. This include liabilities resulting from sales of assets that the reporting entity does not own and revaluation losses. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 false 33 Accrued interest payable 4 us-gaap_IncreaseDecreaseInInterestPayableNet us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false -981516000 -981516 false false false 2 false true false false -1142141000000 -1142141000 false false false 3 false true false false 765565000000 765565000 false false false 4 false true false false 497018000000 497018000 false false false xbrli:monetaryItemType monetary The net change during the reporting period in interest payable, which represents the amount owed to note holders, bond holders, and other parties for interest earned on loans or credit extended to the reporting entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 false 34 Deferred income tax liabilities 4 us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 21615000 21615 false false false 2 false true false false 25153000000 25153000 false false false 3 false true false false -40504000000 -40504000 false false false 4 false true false false 108464000000 108464000 false false false xbrli:monetaryItemType monetary The net change during the period in the amount of cash payments due to taxing authorities for taxes that are based on the reporting entity's earnings. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 false 35 Other liabilities 4 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false -581989000 -581989 false false false 2 false true false false -677230000000 -677230000 false false false 3 false true false false -372488000000 -372488000 false false false 4 false true false false 817536000000 817536000 false false false xbrli:monetaryItemType monetary The net change during the reporting period in other operating obligations not otherwise defined in the taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 true 36 Net cash provided by operating activities 2 us-gaap_NetCashProvidedByUsedInOperatingActivities us-gaap true na duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 3334322000 3334322 false false false 2 false true false false 3879984000000 3879984000 false false false 3 false true false false 3423770000000 3423770000 false false false 4 false true false false 1805081000000 1805081000 false false false xbrli:monetaryItemType monetary The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 true 37 Cash flows from investing activities: 1 us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 38 Net change in restricted cash 2 us-gaap_IncreaseDecreaseInRestrictedCash us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -1079615000 -1079615 false false false 2 false true false false -1256294000000 -1256294000 false false false 3 false true false false -797452000000 -797452000 false false false 4 false true false false -719352000000 -719352000 false false false xbrli:monetaryItemType monetary The net cash inflow (outflow) for the net change associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15, 16, 17 false 39 Net change in interest-bearing deposits in other banks 2 us-gaap_ProceedsFromPaymentsForInInterestBearingDepositsInBanks us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false -198206000 -198206 false false false 2 false true false false -230643000000 -230643000 false false false 3 false true false false -126922000000 -126922000 false false false 4 false true false false 356124000000 356124000 false false false xbrli:monetaryItemType monetary The net cash inflow (outflow) in Interest-bearing Deposits by banks in other financial institutions for relatively short periods of time including, for example, certificates of deposits. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 false 40 Net change in call loans and securities purchased under resale agreements 2 kb_NetChangeInCallLoansAndSecuritiesPurchasedUnderResaleAgreements kb false debit duration Net change in call loans and securities purchased under resale agreements. false false false false false false false false false false false verboselabel false 1 false true false false -537469000 -537469 false false false 2 false true false false -625426000000 -625426000 false false false 3 false true false false 211951000000 211951000 false false false 4 false true false false 110869000000 110869000 false false false xbrli:monetaryItemType monetary Net change in call loans and securities purchased under resale agreements. No authoritative reference available. false 41 Proceeds from sales of available-for-sale securities 2 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 3117106000 3117106 false false false 2 false true false false 3627220000000 3627220000 false false false 3 false true false false 8510135000000 8510135000 false false false 4 false true false false 10571122000000 10571122000 false false false xbrli:monetaryItemType monetary The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph a Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 18 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph b false 42 Proceeds from maturities of available-for-sale securities 2 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 25297937000 25297937 false false false 2 false true false false 29437945000000 29437945000 false false false 3 false true false false 13206773000000 13206773000 false false false 4 false true false false 4026451000000 4026451000 false false false xbrli:monetaryItemType monetary The cash inflow associated maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph a Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Chapter V -Section 563c.102 -Subsection III Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph b false 43 Purchases of available-for-sale securities 2 us-gaap_PaymentsToAcquireAvailableForSaleSecurities us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -31575830000 -31575830 false false false 2 false true false false -36743215000000 -36743215000 false false false 3 false true false false -22295970000000 -22295970000 false false false 4 false true false false -13672668000000 -13672668000 false false false xbrli:monetaryItemType monetary The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph b Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 18 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph a false 44 Proceeds from maturities, prepayments and calls of held-to-maturity securities 2 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 995742000 995742 false false false 2 false true false false 1158695000000 1158695000 false false false 3 false true false false 1735488000000 1735488000 false false false 4 false true false false 3205441000000 3205441000 false false false xbrli:monetaryItemType monetary The cash inflow associated with the maturity, prepayments and calls (requests for early payments) of debt securities designated as held-to-maturity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph a false 45 Purchases of held-to-maturity securities 2 us-gaap_PaymentsToAcquireHeldToMaturitySecurities us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -1015539000 -1015539 false false false 2 false true false false -1181732000000 -1181732000 false false false 3 false true false false -3322132000000 -3322132000 false false false 4 false true false false -3332823000000 -3332823000 false false false xbrli:monetaryItemType monetary The cash outflow to acquire a debt financial instrument for which the entity has the ability and intent to hold until maturity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph a false 46 Net change in venture capital securities 2 kb_NetChangeInVentureCapitalSecurities kb false credit duration Net change in venture capital securities. false false false false false false false false false false true negated false 1 false true false false 4445000 4445 false false false 2 false true false false 5172000000 5172000 false false false 3 false true false false 9949000000 9949000 false false false 4 false true false false -7811000000 -7811000 false false false xbrli:monetaryItemType monetary Net change in venture capital securities. No authoritative reference available. false 47 Proceeds from sales of equity method investment 2 us-gaap_ProceedsFromSaleOfEquityMethodInvestments us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 2882000 2882 false false false 2 false true false false 3354000000 3354000 false false false 3 false true false false 699932000000 699932000 false false false 4 false true false false 209387000000 209387000 false false false xbrli:monetaryItemType monetary The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph b false 48 Purchases of equity method investment 2 us-gaap_PaymentsToAcquireEquityMethodInvestments us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -17765000 -17765 false false false 2 false true false false -20672000000 -20672000 false false false 3 false true false false -812616000000 -812616000 false false false 4 false true false false -128088000000 -128088000 false false false xbrli:monetaryItemType monetary The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph b false 49 Net change in other securities 2 us-gaap_PaymentsForProceedsFromOtherInvestingActivities us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -117995000 -117995 false false false 2 false true false false -137305000000 -137305000 false false false 3 false true false false -415690000000 -415690000 false false false 4 false true false false 42595000000 42595000 false false false xbrli:monetaryItemType monetary The net cash outflow (inflow) from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 false 50 Acquisition of subsidiaries, net of cash acquired 2 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false 4727000 4727 false false false 2 false true false false 5501000000 5501000 false false false 3 false true false false -267543000000 -267543000 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15, 17 false 51 Net originations and repayments of loans 2 us-gaap_ProceedsFromLoanAndLeaseOriginationsAndPrincipalCollections us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -1056464000 -1056464 false false false 2 false true false false -1229354000000 -1229354000 false false false 3 false true false false -28957933000000 -28957933000 false false false 4 false true false false -21891140000000 -21891140000 false false false xbrli:monetaryItemType monetary The cash inflow (outflow) related to a loan origination (the process when securing a mortgage for a piece of real property), lease origination, and principal collections. It is through the origination process that the terms of the mortgage agreement (amount of loan, interest rate, compounding frequency, etc) or lease are established and the involved parties legally bind themselves to the transaction. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 102 -Paragraph 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 13 -Subparagraph b false 52 Proceeds from sales of loans 2 us-gaap_ProceedsFromSaleOfLoansHeldForSale us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 2279472000 2279472 false false false 2 false true false false 2652508000000 2652508000 false false false 3 false true false false 529769000000 529769000 false false false 4 false true false false 282690000000 282690000 false false false xbrli:monetaryItemType monetary The cash inflow resulting from the sale of loans classified as held-for-sale, including proceeds from loans sold through mortgage securitization. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 102 -Paragraph 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 3, 15, 16, 17, 22, 23, 147, 148, 149 false 53 Proceeds from sales of premises and equipment 2 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 15111000 15111 false false false 2 false true false false 17584000000 17584000 false false false 3 false true false false 13956000000 13956000 false false false 4 false true false false 113954000000 113954000 false false false xbrli:monetaryItemType monetary The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph c false 54 Payments for purchases of premises and equipment 2 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -160790000 -160790 false false false 2 false true false false -187103000000 -187103000 false false false 3 false true false false -454877000000 -454877000 false false false 4 false true false false -492379000000 -492379000 false false false xbrli:monetaryItemType monetary The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph c false 55 Net change in security deposits 2 us-gaap_IncreaseDecreaseInSecurityDeposits us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false -51934000 -51934 false false false 2 false true false false -60433000000 -60433000 false false false 3 false true false false -91356000000 -91356000 false false false 4 false true false false -144981000000 -144981000 false false false xbrli:monetaryItemType monetary The net change in the beginning and end of period balances for security deposits. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 true 56 Net cash used in investing activities 2 us-gaap_NetCashProvidedByUsedInInvestingActivities us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false -4094185000 -4094185 false false false 2 false true false false -4764198000000 -4764198000 false false false 3 false true false false -32624538000000 -32624538000 false false false 4 false true false false -21470609000000 -21470609000 false false false xbrli:monetaryItemType monetary The net cash inflow (outflow) from investing activity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 true 57 Cash flows from financing activities: 1 us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 58 Net decrease in non-interest bearing deposits 2 kb_NetIncreaseDecreaseInNonInterestBearingDeposits kb false debit duration Net increase (decrease) in non-interest bearing deposits. false false false false false false false false false false false verboselabel false 1 false true false false -287384000 -287384 false false false 2 false true false false -334414000000 -334414000 false false false 3 false true false false -239913000000 -239913000 false false false 4 false true false false -667229000000 -667229000 false false false xbrli:monetaryItemType monetary Net increase (decrease) in non-interest bearing deposits. No authoritative reference available. false 59 Net increase in interest-bearing deposits 2 kb_NetIncreaseInInterestBearingDeposits kb false debit duration Net increase in interest-bearing deposits. false false false false false false false false false false false verboselabel false 1 false true false false 9283154000 9283154 false false false 2 false true false false 10802342000000 10802342000 false false false 3 false true false false 20494149000000 20494149000 false false false 4 false true false false 9555948000000 9555948000 false false false xbrli:monetaryItemType monetary Net increase in interest-bearing deposits. No authoritative reference available. false 60 Net increase (decrease) in call money 2 kb_NetIncreaseDecreaseInCallMoney kb false debit duration Net increase (decrease) in call money. false false false false false false false false false false false verboselabel false 1 false true false false -1791420000 -1791420 false false false 2 false true false false -2084586000000 -2084586000 false false false 3 false true false false 2581415000000 2581415000 false false false 4 false true false false 625945000000 625945000 false false false xbrli:monetaryItemType monetary Net increase (decrease) in call money. No authoritative reference available. false 61 Net decrease in secured borrowings 2 us-gaap_ProceedsFromRepaymentsOfSecuredDebt us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false -1039768000 -1039768 false false false 2 false true false false -1209926000000 -1209926000 false false false 3 false true false false -435263000000 -435263000 false false false 4 false true false false -1147732000000 -1147732000 false false false xbrli:monetaryItemType monetary The net cash inflow (outflow) from the aggregate amount of collateralized debt (where debt is backed by the pledge of collateral, a mortgage or other lien). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 false 62 Net increase (decrease) in other borrowed funds 2 us-gaap_ProceedsFromRepaymentsOfOtherDebt us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false -2017645000 -2017645 false false false 2 false true false false -2347833000000 -2347833000 false false false 3 false true false false 2533164000000 2533164000 false false false 4 false true false false -3123966000000 -3123966000 false false false xbrli:monetaryItemType monetary The net cash inflow (outflow) in other borrowings not otherwise defined in the taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 false 63 Proceeds from issuance of long-term debt 2 us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 8466718000 8466718 false false false 2 false true false false 9852296000000 9852296000 false false false 3 false true false false 15981200000000 15981200000 false false false 4 false true false false 16176552000000 16176552000 false false false xbrli:monetaryItemType monetary The cash inflow from other borrowings not otherwise defined in the taxonomy (with maturities initially due beyond one year or the normal operating cycle of the entity, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph b false 64 Repayment of long-term debt 2 us-gaap_RepaymentsOfOtherLongTermDebt us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -12369695000 -12369695 false false false 2 false true false false -14393996000000 -14393996000 false false false 3 false true false false -7255854000000 -7255854000 false false false 4 false true false false -1523302000000 -1523302000 false false false xbrli:monetaryItemType monetary The cash outflow for borrowing not otherwise defined in the taxonomy (with maturities initially due after one year or beyond the operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph b false 65 Cash dividends paid to noncontrolling interests by subsidiaries 2 us-gaap_PaymentsOfDividendsMinorityInterest us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false -1535000000 -1535000000 false false false 4 false true false false -1534000000 -1534000000 false false false xbrli:monetaryItemType monetary The cash outflow for the return on capital for noncontrolled interest in the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph a false 66 Payment for stock option exercise 2 kb_PaymentForStockOptionExercise kb false credit duration Payment for stock option exercise. false false false false false false false false false false true negated false 1 false true false false -1172000 -1172 false false false 2 false true false false -1363000000 -1363000 false false false 3 false true false false -894000000 -894000 false false false 4 false true false false -5308000000 -5308000 false false false xbrli:monetaryItemType monetary Payment for stock option exercise. No authoritative reference available. false 67 Proceeds from reissuance of treasury stock 2 us-gaap_ProceedsFromSaleOfTreasuryStock us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 221683000 221683 false false false 2 false true false false 257962000000 257962000 false false false 3 false true false false 1595000000 1595000 false false false 4 false true false false 8212000000 8212000 false false false xbrli:monetaryItemType monetary The cash inflow from the issuance of an equity stock that has been previously reacquired by the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph a false 68 Purchases of treasury stock 2 us-gaap_PaymentsForRepurchaseOfCommonStock us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -1971000 -1971 false false false 2 false true false false -2294000000 -2294000 false false false 3 false true false false -3411293000000 -3411293000 false false false 4 false true false false -6247000000 -6247000 false false false xbrli:monetaryItemType monetary The cash outflow to reacquire common stock during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph a false 69 Cash dividends paid on common stocks 2 us-gaap_PaymentsOfDividendsCommonStock us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false -824065000000 -824065000000 false false false 4 false true false false -1227784000000 -1227784000000 false false false xbrli:monetaryItemType monetary The cash outflow from the distribution of an entity's earnings in the form of dividends to common shareholders. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph a false 70 Increase in noncontrolling interests 2 us-gaap_ProceedsFromMinorityShareholders us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 26776000 26776 false false false 2 false true false false 31158000000 31158000 false false false 3 false true false false 1013000000 1013000 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary The cash inflow contributed by noncontrolled interest that purchase additional shares or otherwise increase their ownership stake in a subsidiary of the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph a true 71 Net cash provided by financing activities 2 us-gaap_NetCashProvidedByUsedInFinancingActivities us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 489276000 489276 false false false 2 false true false false 569346000000 569346000 false false false 3 false true false false 29423719000000 29423719000 false false false 4 false true false false 18663555000000 18663555000 false false false xbrli:monetaryItemType monetary The net cash inflow (outflow) from financing activity for the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 true 72 Effect of exchange rate changes on cash 1 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false -54116000 -54116 false false false 2 false true false false -62973000000 -62973000 false false false 3 false true false false 79996000000 79996000 false false false 4 false true false false -2082000000 -2082000 false false false xbrli:monetaryItemType monetary The effect of exchange rate changes on cash balances held in foreign currencies. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 25 true 73 Net increase (decrease) in cash and cash equivalents 1 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease us-gaap true na duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false -324703000 -324703 false false false 2 false true false false -377841000000 -377841000 false false false 3 false true false false 302947000000 302947000 false false false 4 false true false false -1004055000000 -1004055000 false false false xbrli:monetaryItemType monetary The net change between the beginning and ending balance of cash and cash equivalents. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 false 74 Cash and cash equivalents, beginning of year 1 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant No definition available. false false false false false false false false true false false periodstartlabel false 1 false true false false 2641181000 2641181 false false false 2 false true false false 3073410000000 3073410000 false false false 3 false true false false 2770463000000 2770463000 false false false 4 false true false false 3774518000000 3774518000 false false false xbrli:monetaryItemType monetary Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 26 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 false 75 Cash and cash equivalents, end of year 1 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant No definition available. false false false false false false false false false true false periodendlabel false 1 false true false false 2316478000 2316478 false false false 2 false true false false 2695569000000 2695569000 false false false 3 false true false false 3073410000000 3073410000 false false false 4 false true false false 2770463000000 2770463000 false false false xbrli:monetaryItemType monetary Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents. 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Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. 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No authoritative reference available. false 81 Increase (decrease) in cumulative translation adjustments, net of tax 2 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease us-gaap true na duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false -101108000 -101108 false false false 2 false true false false -117655000000 -117655000 false false false 3 false true false false 91626000000 91626000 false false false 4 false true false false 1509000000 1509000 false false false xbrli:monetaryItemType monetary Adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into functional currency of the reporting entity, net of tax. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 52 -Paragraph 13, 20, 31 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 24 -Subparagraph b Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 14, 17, 19, 26 false 82 Increase (decrease) in unrealized gains on investment securities, net of tax 2 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false -3342000 -3342 false false false 2 false true false false -3889000000 -3889000 false false false 3 false true false false 431269000000 431269000 false false false 4 false true false false -558978000000 -558978000 false false false xbrli:monetaryItemType monetary Appreciation or loss in value (before reclassification adjustment) of the total of unsold securities during the period being reported on, net of tax. Reclassification adjustments include: (1) the unrealized holding gain or loss, net of tax, at the date of the transfer for a debt security from the held-to-maturity category transferred into the available-for-sale category. Also includes the unrealized gain or loss at the date of transfer for a debt security from the available-for-sale category transferred into the held-to-maturity category; (2) the unrealized gains or losses realized upon the sale of securities, after tax; and (3) the unrealized gains or losses realized upon the write-down of securities, after tax. 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No authoritative reference available. false 85 Acquisition of noncontrolling interests 3 kb_AcquisitionOfMinorityInterests kb false na duration Acquisition of minority interests. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 33459000000 33459000000 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Acquisition of minority interests. 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