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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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Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element. 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No authoritative reference available. false 8 Trading assets 2 kb_TradingAssets kb false debit instant The total of financial instruments that are bought and held principally for the purpose of selling them in the near term... false false false false false false false false false false false verboselabel false 1 false true false false 6635634000 6635634 false false false 2 false true false false 13095157000000 13095157000 false false false 3 false true false false 7721555000000 7721555000 false false false xbrli:monetaryItemType monetary The total of financial instruments that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for debt and equity securities formerly categorized as available-for-sale or held-to-maturity which the entity held as of the date it opted to account for such securities at fair value. An enterprise may also categorize such a security as trading without the intent to sell it in the near term assuming the decision to categorize the security as trading occurred at acquisition; this is the reason why the trading category of investments in debt and equity securities are bought and sold "principally" for sale in the near term. Transfers into and out of the trading category should be rare. The accounts include derivatives and foreing exchange spot contracts. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e false 11 Due from customers on acceptances 2 us-gaap_DueFromCustomerAcceptances us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 1628878000 1628878 false false false 2 false true false false 2062618000000 2062618000 false false false 3 false true false false 1895444000000 1895444000 false false false xbrli:monetaryItemType monetary Amounts receivable from customers on short-term negotiable time drafts drawn on and accepted by the institution (also known as banker's acceptance transactions) that are outstanding on the reporting date. 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Examples include land, buildings, and production equipment. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 12 -Paragraph 5 -Subparagraph b, c Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 false 13 Accrued interest and dividends receivable 2 us-gaap_AccruedInvestmentIncomeReceivable us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 884508000 884508 false false false 2 false true false false 1123833000000 1123833000 false false false 3 false true false false 1029257000000 1029257000 false false false xbrli:monetaryItemType monetary Interest, dividends, rents, ancillary and other revenues earned but not yet received by the entity on its investments. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 4 -Article 7 false 14 Security deposits 2 us-gaap_SecurityDeposit us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 1207956000 1207956 false false false 2 false true false false 1427624000000 1427624000 false false false 3 false true false false 1405638000000 1405638000 false false false xbrli:monetaryItemType monetary The amount of an asset, typically cash, provided to a counterparty to provide certain assurance of performance by the entity pursuant to the terms of a written or oral agreement, such as a lease. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 43 false 16 Other intangible assets, net 2 us-gaap_FiniteLivedIntangibleAssetsNet us-gaap true debit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 163893000 163893 false false false 2 false true false false 208486000000 208486000 false false false 3 false true false false 190715000000 190715000 false false false xbrli:monetaryItemType monetary The aggregate sum of gross carrying value of a major finite-lived intangible asset class, less accumulated amortization and any impairment charges. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) false 17 Other assets 2 us-gaap_OtherAssets us-gaap true debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 1261258000 1261258 false false false 2 false true false false 2270510000000 2270510000 false false false 3 false true false false 1467663000000 1467663000 false false false xbrli:monetaryItemType monetary Carrying amount as of the balance sheet date of assets not otherwise specified in the taxonomy. Also serves as the sum of assets not individually reported in the financial statements, or not separately disclosed in notes. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 7 true 18 Total assets 2 us-gaap_Assets us-gaap true debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 218154456000 218154456 false false false 2 false true false false 258326911000000 258326911000 false false false 3 false true false false 253855432000000 253855432000 false false false xbrli:monetaryItemType monetary Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Concepts (CON) -Number 6 -Paragraph 25 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 true 20 Deposits: 2 us-gaap_DepositsAbstract 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 xbrli:stringItemType string No definition available. false 21 Interest bearing 3 us-gaap_InterestBearingDepositLiabilities us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 142722400000 142722400 false false false 2 false true false false 155263206000000 155263206000 false false false 3 false true false false 166078921000000 166078921000 false false false xbrli:monetaryItemType monetary The aggregate of all domestic and foreign interest-bearing deposit liabilities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 9 false 22 Non-interest bearing 3 us-gaap_NoninterestBearingDepositLiabilities us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 2667595000 2667595 false false false 2 false true false false 3438269000000 3438269000 false false false 3 false true false false 3104147000000 3104147000 false false false xbrli:monetaryItemType monetary The aggregate amount of all domestic and foreign noninterest-bearing deposits liabilities held by the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 9 false 23 Call money 2 kb_CallMoney kb false credit instant Call money. false false false false false false false false false false false verboselabel false 1 false true false false 1172617000 1172617 false false false 2 false true false false 3443811000000 3443811000 false false false 3 false true false false 1364516000000 1364516000 false false false xbrli:monetaryItemType monetary Call money. No authoritative reference available. false 24 Trading Liabilities 2 us-gaap_TradingLiabilities us-gaap true credit instant No definition available. false false false false false false false false false false false false 1 false true false false 3648953000 3648953 false false false 2 false true false false 8191081000000 8191081000 false false false 3 false true false false 4246104000000 4246104000 false false false xbrli:monetaryItemType monetary The carrying amount of liabilities as of the balance sheet date that pertain to principal and customer trading transactions, or which may be incurred with the objective of generating a profit from short-term fluctuations in price as part of an entity's market-making, hedging and proprietary trading. Examples include short positions in securities, derivatives and commodities, obligations under repurchase agreements, and securities borrowed arrangements. No authoritative reference available. false 25 Acceptances outstanding 2 us-gaap_BankAcceptancesExecutedAndOutstanding us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 1628878000 1628878 false false false 2 false true false false 2062618000000 2062618000 false false false 3 false true false false 1895444000000 1895444000 false false false xbrli:monetaryItemType monetary Carrying amount as of the balance sheet date of drafts and bills of exchange that have been accepted by the reporting bank, or by others for its own account, as its liability to holders of the drafts. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 14 -Article 9 false 26 Other borrowed funds 2 us-gaap_OtherBorrowings us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 7026414000 7026414 false false false 2 false true false false 10526916000000 10526916000 false false false 3 false true false false 8176286000000 8176286000 false false false xbrli:monetaryItemType monetary The carrying amount as of the balance sheet date for the aggregate of other miscellaneous borrowings owed by the reporting entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13, 16 -Article 9 false 27 Accrued interest payable 2 us-gaap_InterestPayableCurrentAndNoncurrent us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 3282209000 3282209 false false false 2 false true false false 4961602000000 4961602000 false false false 3 false true false false 3819342000000 3819342000 false false false xbrli:monetaryItemType monetary Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. 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Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. No authoritative reference available. false 29 Long-term debt 2 us-gaap_OtherLongTermDebt us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 34004992000 34004992 false false false 2 false true false false 45147962000000 45147962000 false false false 3 false true false false 39569909000000 39569909000 false false false xbrli:monetaryItemType monetary Including both current and noncurrent portions, carrying amount as of the balance-sheet date of other forms of debt not elsewhere specified in the taxonomy with initial maturities beyond one year or beyond the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 false 30 Other liabilities 2 us-gaap_OtherLiabilities us-gaap true credit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 2882963000 2882963 false false false 2 false true false false 3817005000000 3817005000 false false false 3 false true false false 3354760000000 3354760000 false false false xbrli:monetaryItemType monetary Carrying amount as of the balance sheet date of liabilities not otherwise specified in the taxonomy. Also serves as the sum of liabilities not individually reported in the financial statements, or not separately disclosed in notes. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Article 9 true 31 Total liabilities 2 us-gaap_Liabilities us-gaap true credit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 203050021000 203050021 false false false 2 false true false false 242732123000000 242732123000 false false false 3 false true false false 236279157000000 236279157000 false false false xbrli:monetaryItemType monetary Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future. No authoritative reference available. true 32 Commitments and contingencies (Note 31) 1 us-gaap_CommitmentsAndContingencies2009 us-gaap true na duration No definition available. 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 xbrli:stringItemType string Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur. This caption alerts the reader that one or more notes to the financial statements disclose pertinent information about the entity's commitments and contingencies. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 8, 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 25 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 17 -Article 9 false 33 TOTAL EQUITY 1 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract 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 xbrli:stringItemType string No definition available. false 34 Common stock ( 5,000 par value, authorized 1 billion shares, 356,351,693 shares issued and 308,921,422 shares outstanding at 2008 and 386,351,693 shares issued and 343,028,989 shares outstanding at 2009) 2 us-gaap_CommonStockValue us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 1660085000 1660085 false false false 2 false true false false 1781758000000 1781758000 false false false 3 false true false false 1931758000000 1931758000 false false false xbrli:monetaryItemType monetary Dollar value of issued common stock whether issued at par value, no par or stated value. This item includes treasury stock repurchased by the entity. Note: elements for number of common shares, par value and other disclosure concepts are in another section within stockholders' equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 false 35 Additional paid-in capital 2 us-gaap_AdditionalPaidInCapitalCommonStock us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 6187902000 6187902 false false false 2 false true false false 6253322000000 6253322000 false false false 3 false true false false 7200553000000 7200553000 false false false xbrli:monetaryItemType monetary Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 false 36 Retained earnings 2 us-gaap_RetainedEarningsAccumulatedDeficit us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 9262343000 9262343 false false false 2 false true false false 10032771000000 10032771000 false false false 3 false true false false 10778124000000 10778124000 false false false xbrli:monetaryItemType monetary The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 false 37 Accumulated other comprehensive income net of tax 2 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 210244000 210244 false false false 2 false true false false 389909000000 389909000 false false false 3 false true false false 244651000000 244651000 false false false xbrli:monetaryItemType monetary Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at fiscal year-end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, and unrealized gains and losses on certain investments in debt and equity securities as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. 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Treasury stock is issued but is not outstanding. This stock has no voting rights and receives no dividends. Note that treasury stock may be recorded at its total cost or separately as par (or stated) value and additional paid in capital. Note: number of treasury shares concept is in another section within stockholders' equity. 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The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. 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