The aggregate interest income earned from federal funds sold, securities purchased under agreements to resell and interest-bearing deposits due from other financial institutions. Short-term investments income Short-term investments Short Term Investments Income Fees related to letters of credit, loan commitment fees, syndication fees and other nonyield-related loan fees. Letter of Credit and Loan Fees Letter of credit and loan fees Income derived from investment banking activities, dealer trading and derivatives, foreign exchange income, and other capital markets activities. Investment Banking and Capital Markets Income Investment banking and capital markets income (loss) Fees received from other banking institutions for processing PIN based point of sale transactions. Also includes various ATM-related fees and income. Electronic Banking Fees Electronic banking fees Represents insurance premiums and commission income earned through the sale of annuity and other insurance products. Insurance Income Insurance income Expenses related to operating leases such as depreciation expense on leased equipment. Operating Lease Expense Operating lease expense Unearned Income on Loans Reflects the cumulative amount of interest and fees paid by borrowers which have not yet been taken into income in conformity with GAAP. Also reflects the amount of unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans that are being amortized into income as an adjustment to yield. Unearned Income Loan Line of Business Results Line of Business Results [Abstract] Line of Business Results [Abstract] Securities Securities [Abstract] Securities [Abstract] Capital Securities Issued by Unconsolidated Subsidiaries Capital Securities Issued by Unconsolidated Subsidiaries [Abstract] Capital Securities Issued by Unconsolidated Subsidiaries [Abstract] Fair Value Measurements Fair Value Measurements [Abstract] Fair Value Measurements [Abstract] A description of the business trusts that issued corporation-obligated mandatorily redeemable preferred capital securities and related activity for the year-to-date period. Also includes a tabular disclosure of the carrying amount of the capital securities and common stock issued by the trusts, the principal amount of related debentures issued by KeyCorp and purchased by the trusts, and the interest rates and maturities of the capital securities and debentures as of the balance sheet date. Capital Securities Issued by Unconsolidated Subsidiaries Capital Securities Issued by Unconsolidated Subsidiaries Capital Securities Issued By Unconsolidated Subsidiaries [Text Block] Cash dividends declared on Preferred Stock, per share/annum Cash dividends declared during the period on Preferred Stock, per share/annum. Cash dividends declared on Preferred Stock, per share/annum Cash Dividends On Series Preferred Stock Per Share Loans and Loans Held for Sale. Loans and Loans Held for Sale [Abstract] Loans and Loans Held for Sale [Abstract] Discloses loans receivable and loans receivable held for sale. Also includes a roll-forward of the allowance for loan losses, a roll-forward for liability for credit losses on lending-related commitments, composition of the net investment in direct financing leases and minimum future lease payments receivables as well as the related allowance. Loans And Loans Held For Sale Loans and Loans Held for Sale Loans And Loans Held For Sale [Text Block] Deposits in domestic offices. Deposits In Domestic Offices [Abstract] Deposits in domestic offices: Common Stock Warrant. Common Stock Warrant Common Stock Warrant Common Stock Warrant Common Stock Warrant Member Common stock warrant Common stock warrant A warrant to purchase common shares to the U.S. Treasury at a fair value of $87 million. Other time deposits Other time deposits The aggregate amount of time deposits, including certificates of deposit of less than $100,000, individual retirement accounts and open accounts. Other time deposits NOW and money market deposit accounts NOW and money market deposit accounts Amount of deposits in interest-bearing accounts that offer many of the same services as checking accounts although transactions may be somewhat more limited. These deposits include those that share some of the characteristics of a money market fund and are insured by the Federal government, also known as money market deposits accounts (MMDAs). Also included are deposits in interest-bearing transaction accounts, that are restricted with regard to ownership and can usually only be held by individuals, nonprofit entities and governments. These deposits, also known as negotiable order of withdrawal (NOW) accounts, differ from money market deposit accounts, as they typically have higher deposit reserve requirements and no limit on the number of checks that can be written. NOW and money market deposit accounts Now And Money Market Deposit Accounts FDIC assessment FDIC assessment Represents deposit reserve assessments charged by the Federal Deposit Insurance Corporation. FDIC assessment FDIC Assessment Securities Securities This item represents the entire disclosure related to securities which consist of all investments in certain debt and equity securities classified as available-for-sale or held-to-maturity securities. Securities [Text Block] Short-term investments Short term investment Federal funds sold, securities purchased under agreements to resell and interest-bearing deposits due from other financial institutions. Savings deposits Savings deposits The amount of interest bearing deposits with no stated maturity, which may include passbook and statement savings accounts. Certificates of deposit ($100,000 or more) Certificates of deposit The aggregate amount of certificates of deposit of $100,000 or more. Noninterest-bearing Noninterest-bearing The aggregate amount of all noninterest-bearing deposit liabilities held by the entity. Noninterest Bearing Common Stock Values Common shares, $1 par value; authorized 1,400,000,000 shares; issued 584,061,120, 584,061,120 and 491,888,780 shares Common shares, $1 par value; authorized 1,400,000,000 shares; issued 946,348,435, 946,348,435 and 946,348,435 shares Carrying amount of issued common stock that may be calculated differently depending on whether the stock is issued at par value, no par or stated value. Treasury stock, at cost (66,020,414, 67,813,492 and 67,789,166 shares) Treasury Stock Values Treasury stock, at cost (85,487,810, 89,058,634, and 91,818,259 shares) Treasury stock, at cost (67,813,492 and 89,058,634 shares) The cost of common and preferred stock of an entity that has been repurchased by the entity. Treasury stock is issued but not outstanding. This stock has no voting rights and receives no dividends. Preferred Stock, Shares Authorized Preferred Stock Share Authorized Total preferred stock shares authorized for current or future issuance. Trading account assets Trading Account Assets Interest income derived from securities and loans held for trading purposes. Other income Other Income Noninterest Other noninterest income that is not separately presented in any other category. Other income Intangible Assets Impairment Intangible assets impairment The amount of impairment loss recognized from the write-down of the carrying amount of an intangible asset (including goodwill) to fair value. Net decrease (increase) in short-term investments Net decrease (increase) in short-term investments Net decrease in short term investments The net cash inflow and outflow of federal funds sold, securities purchased under agreements to resell and interest-bearing deposits due from other financial institutions. Net decrease increase in loans excluding acquisitions sales and transfers Net decrease (increase) in loans, excluding acquisitions, sales and transfers Net decrease (increase) in loans, excluding acquisitions, sales and transfers The net change in the total loans, excluding acquisitions, sales and transfers. Other investments Other investments Interest income earned on other investments not otherwise specified in the taxonomy that generally will be realized in a short period of time, usually less than one year or the normal operating cycle, whichever is longer. Other Investments Interest Proceeds from sale/redemption of Visa Inc. shares Proceeds from sale/redemption of Visa Inc. shares Proceeds from the sale or redemption of Visa Inc. shares. Proceeds From Sale Or Redemption Of Visa Inc Securities Trust and investment services income Trust and Investment Services Income Brokerage commissions and fee income, personal asset management and custody fees, and institutional asset management and custody fees. Income (loss) from continuing operations attributable to Key common shareholders Loss From Continuing Operations Attributable To Key Common Shareholders Loss from continuing operations after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). Net unrealized gains (losses) on securities available for sale, net of income taxes of ($10) and $214, respectively Other Comprehensive Income Unrealized Holding Gains Losses On Securities Arising During Period Net Of Tax Appreciation or loss in value (net of reclassification adjustments) 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. Deferred compensation Deferred Compensation The value of deferred stock compensation and dividends declared on deferred stock compensation. Income (loss) from continuing operations attributable to Key common shareholders Income (Loss) From Continuing Operations Attributable To Key Commons Shareholders Per Diluted Share The amount of income (loss) from continuing operations after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period) available to each share of common stock outstanding during the reporting period and each share that would have been outstanding assuming the issuance of common shares for all dilutive potential common shares outstanding during the reporting period. Income (loss) from continuing operations attributable to Key common shareholders Income (Loss) From Continuing Operations Attributable To Commons Shareholders Per Basic Share The amount of income (loss) from continuing operations after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period) per each share of common stock outstanding during the reporting period. Net tax effect on loss from discontinued operations Net Tax Effect On Income Loss From Discontinued Operations Net tax effect on income (loss) from discontinued operations. INCOME (LOSS) FROM CONTINUING OPERATIONS Income (Loss) From Continuing Operation This element represents the income or loss from continuing operations attributable to the reporting entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items and cumulative effects of changes in accounting principles, and before deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests, if any. Gains on leased equipment Gains Losses On Leased Equipment Gains on leased equipment. Gains on leased equipment Provision (credit) for losses on lending-related commitments Provision (Credit) for Losses on Lending Related Commitments Represents portion of current operating income set aside to provide an adequate reserve against losses incurred from lending-related commitments. Gain from sale/redemption of Visa Inc. shares Gain From Sale Or Redemption Of Securities Gain from sale or redemption of Visa Inc. shares Gain from sale/redemption of Visa Inc. shares Commitments, Contingent Liabilities and Guarantees [Abstract] Commitments, Contingent Liabilities and Guarantees [Abstract] Commitments, Contingent Liabilities and Guarantees. Commitments, Contingent Liabilities and Guarantees Commitments Contingent Liabilities And Guarantees [Text Block] Disclosure of obligations under noncancelable leases, commitments to extend credit or funding, legal proceedings, guarantees and other off-balance sheet risk. Nonperforming Assets and Past Due Loans From Continuing Operations [Abstract] Nonperforming Assets and Past Due Loans From Continuing Operations. Nonperforming Assets and Past Due Loans From Continuing Operations Nonperforming Assets And Past Due Loans From Continuing Operations [Text Block] Tabular disclosure and description of total nonperforming assets and past due loans. Variable Interest Entities [Abstract] Variable Interest Entities Abstract. Accrued income and other assets of Consolidated Vies Accrued income and other assets of consolidated VIEs Accrued income and other assets of Consolidated VIEs. Discontinued assets of consolidated VIEs at fair value. Discontinued assets of consolidated Vies at fair value Discontinued assets of consolidated VIEs at fair value Document and Entity Information. Document and Entity Information [Abstract] Consolidated Education loan securitization trusts VIE's at fair value Consolidated Education loan securitization trusts VIE'S at fair value. Consolidated Education loan securitization trusts Vies at fair value Proceeds From Loan Sales Proceeds from loan sales The cash inflow from loan sales. Gain Related To Exchange Of Common Shares For Capital Securities Gain related to exchange of common shares for capital securities Gain related to exchange of common shares for capital securities Gain Related to Exchange of Common Shares for Capital Securities. Provision For Losses On Low Income Housing Tax Credit Guaranteed Funds Provision for losses on LIHTC guaranteed funds Provision For Losses on Low Income Housing Tax Credit Guaranteed Funds. Net Proceeds From Issuance Of Common Shares And Preferred Stock Net proceeds from issuance of common shares and preferred stock Net Proceeds from Issuance of Common Shares and Preferred Stock. Gain From Sale Of Company Claim Associated With Other Company Gain from sale of Key's claim associated with the Lehman Gain from Sale of Company Claim Associated With Other Company. Common Shares Exchanged For Series Preferred Stock Common shares exchanged for Series A Preferred Stock Common Shares Exchanged for Series A Preferred Stock. Common Shares Exchanged For Series Preferred Stocks Common shares exchanged for Series A Preferred Stock, Shares Common Shares Exchanged For Series A Preferred Stocks. Common Shares Exchanged For Capital Securities Common shares exchanged for capital securities Common Shares Exchanged For Capital Securities. Common Share Exchanged For Capital Securities Common shares exchanged for capital securities, Shares Common Shares Exchanged For Capital Securities. Net unrealized gains losses on common investments held in employee welfare benefits trust net of income taxes Net unrealized gains (losses) on common investments held in employee welfare benefits trust, net of income taxes Appreciation or loss in value of common investments held in employee welfare benefits trust, net of tax. Provision For Customer Derivative Losses Provision For Customer Derivative Losses Provision for customer derivative losses Accumulated other comprehensive income (loss) Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance Accumulated Other Comprehensive Income (Loss), Net of Tax Capital surplus Capital surplus Additional Paid in Capital Additional Paid in Capital, Beginning Balance Additional Paid in Capital, Ending Balance Additional Paid in Capital Consolidated Balance Sheets [Abstract] Discontinued assets (including $3,291 of consolidated education loan securitization trusts VIEs at fair value, see Note 7) (a) Assets of Disposal Group, Including Discontinued Operation Corporate-owned life insurance Corporate-owned life insurance Bank Owned Life Insurance Net (loss) income attributable to Key Net income (loss) attributable to Key common shareholders Earnings Per Share, Basic, Total Earnings Per Share, Basic CASH AND DUE FROM BANKS AT END OF PERIOD CASH AND DUE FROM BANKS AT BEGINNING OF PERIOD Cash and due from banks Cash and due from banks Cash and Due from Banks Cash and Due From Banks Interest paid Interest paid Interest paid Interest Paid, Net Net decrease in short-term borrowings Net increase (decrease) in short-term borrowings Proceeds from (Repayments of) Short-term Debt Proceeds from (Repayments of) Short-term Debt Common Shares, Shares Authorized Common Shares, Shares Authorized Common Stock, Shares Authorized Common Shares, Shares Issued Common Shares, Shares Issued Common Stock, Shares, Issued, Total Common Stock, Shares, Issued Ending Balance, Shares Beginning Balance, Shares Common Stock, Shares, Outstanding Total deposits Total deposits Deposits Depreciation and amortization expense Depreciation and amortization expense Depreciation, Amortization and Accretion, Net Depreciation, Amortization and Accretion, Net Derivative assets Derivative assets Derivative Assets, Total Derivative Assets Derivatives and Hedging Activities Derivatives and Hedging Activities Derivative Instruments and Hedging Activities Disclosure [Text Block] Net (loss) income attributable to Key - assuming dilution Net income (loss) attributable to Key common shareholders Earnings Per Share, Diluted, Total Earnings Per Share, Diluted Discontinued Operations Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Discontinued Operations [Abstract] Federal funds purchased and securities sold under repurchase agreements Federal funds purchased and securities sold under repurchase agreements Federal Funds Purchased and Securities Sold under Agreements to Repurchase Federal Funds Purchased and Securities Sold under Agreements to Repurchase Derivatives and Hedging Activities [Abstract] Employee Benefits [Abstract] Consolidated Statements of Income [Abstract] Income (loss) from discontinued operations, net of taxes, of $10, ($10), ($5) and ($24) (see Note 16) Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Income (loss) from discontinued operations, net of taxes Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share, Total Income (loss) from discontinued operations, net of taxes Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share Income (Loss) from Discontinued Operations, Net of Tax, Per Outstanding Share, Total Income Taxes Income Taxes Income Tax Disclosure [Text Block] Income taxes (refunded) paid Income taxes paid (refunded) Income Taxes Paid, Net Income Taxes Paid, Net Net decrease (increase) in trading account assets Increase (Decrease) in Trading Securities Increase (Decrease) in Trading Securities, Total Other intangible assets Other intangible assets Intangible Assets, Net (Excluding Goodwill) Intangible Assets, Net (Excluding Goodwill) Goodwill Goodwill, Beginning Balance Goodwill, Ending Balance Goodwill Total interest-bearing Total interest-bearing Interest-bearing Deposit Liabilities, Domestic Deposits in foreign office - interest-bearing Deposits in foreign office - interest-bearing Deposits in foreign office - interest-bearing Interest-bearing Deposit Liabilities, Foreign Total interest expense Interest Expense INTEREST EXPENSE Interest Expense [Abstract] Deposits Deposits Interest Expense, Deposits Interest Expense, Deposits Federal funds purchased and securities sold under repurchase agreements Federal funds purchased and securities sold under repurchase agreements Interest Expense, Federal Funds Purchased and Securities Sold under Agreements to Repurchase Interest Expense, Federal Funds Purchased and Securities Sold under Agreements to Repurchase Long-term debt Long-term debt Interest Expense, Long-term Debt Interest Expense, Long-term Debt Bank notes and other short-term borrowings Bank notes and other short-term borrowings Interest Expense, Short-term Borrowings Excluding Federal Funds and Securities Sold under Agreements to Repurchase Interest Expense, Short-term Borrowings Excluding Federal Funds and Securities Sold under Agreements to Repurchase Securities available for sale Securities available for sale Interest and Dividend Income, Securities, Available-for-sale Net interest (expense) income after provision for loan losses Net interest income (expense) after provision for loan losses Interest Income (Expense), after Provision for Loan Loss Held-to-maturity securities Held-to-maturity securities Interest and Dividend Income, Securities, Held-to-maturity Loans Loans Interest and Fee Income, Loans and Leases Held-in-portfolio Interest and Fee Income, Loans and Leases Held-in-portfolio Loans held for sale Loans held for sale Interest and Fee Income, Loans and Leases Held-for-sale Interest and Fee Income, Loans and Leases Held-for-sale Personnel Labor and Related Expense, Total Labor and Related Expense Total liabilities Total liabilities Liabilities LIABILITIES Liabilities [Abstract] Discontinued liabilities (including $3,122 of consolidated education loan securitization trusts VIEs at fair value, see Note 7) (a) Liabilities of Disposal Group, Including Discontinued Operation Total liabilities and equity Liabilities and Stockholders' Equity Loans held for sale Loans held for sale Loans Receivable Held-for-sale, Net Loans Receivable Held-for-sale, Net, Beginning Balance Loans Receivable Held-for-sale, Net, Ending Balance Loans Receivable Held-for-sale, Net Loans, net of unearned income of $1,587, $1,770 and $1,843 Loans and Leases Receivable, Net of Deferred Income Loans, net of unearned income of $1,995, $2,345 and $2,532 Loans and Leases Receivable, Net of Deferred Income Long-term debt Long-term debt Long-term Debt Long-term Debt Securities available for sale Securities available for sale Available-for-sale Securities Available-for-sale Securities Held-to-maturity securities (fair value: $18, $24 and $24) Held-to-maturity securities (fair value: $25, $25 and $29) Held-to-maturity Securities Held-to-maturity Securities, Total Noncontrolling interests Noncontrolling interest Minority Interest, Beginning Balance Minority Interest, Ending Balance Noncontrolling interest Stockholders' Equity Attributable to Noncontrolling Interest Net distribution from noncontrolling interests Net distribution to noncontrolling interests Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Net contribution to noncontrolling interests Noncontrolling Interest, Increase from Stock Issuance or Sale of Parent Equity Interest NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES Net Cash Provided by (Used in) Financing Activities FINANCING ACTIVITIES Net Cash Provided by (Used in) Financing Activities [Abstract] NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES Net Cash Provided by (Used in) Investing Activities INVESTING ACTIVITIES Net Cash Provided by (Used in) Investing Activities [Abstract] NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES Net Cash Provided by (Used in) Operating Activities OPERATING ACTIVITIES Net Cash Provided by (Used in) Operating Activities [Abstract] Net increase (decrease) in deposits Net increase (decrease) in deposits Increase (Decrease) in Deposits Increase (Decrease) in Deposits Net decrease (increase) in loans held for sale excluding transfers from continuing operations Increase (Decrease) in Loans Held-for-sale Net increase in loans held for sale Net decrease (increase) in loans held for sale excluding transfers from continuing operations Increase (Decrease) in Loans Held-for-sale NET INCOME (LOSS) ATTRIBUTABLE TO KEY NET INCOME (LOSS) ATTRIBUTABLE TO KEY Net income (loss) Net Income (Loss) Attributable to Parent Net income (loss) attributable to Key common shareholders Net Income (Loss) Available to Common Stockholders, Basic, Total Net Income (Loss) Available to Common Stockholders, Basic NET INCREASE (DECREASE) IN CASH AND DUE FROM BANKS NET (DECREASE) INCREASE IN CASH AND DUE FROM BANKS Cash and Cash Equivalents, Period Increase (Decrease) NET INTEREST INCOME NET INTEREST INCOME Interest Income (Expense), Net Less: Allowance for loan losses Less: Allowance for loan losses Less: Allowance for loan losses Loans and Leases Receivable, Allowance, Beginning Balance Loans and Leases Receivable, Allowance, Ending Balance Loans and Leases Receivable, Allowance Net loans Net loans Loans and Leases Receivable, Net Reported Amount Computer processing Computer processing Communications and Information Technology Communications and Information Technology Net occupancy Net occupancy Occupancy, Net Other expense Other expense Other expense Other Noninterest Expense Total noninterest income Total noninterest income Noninterest Income NONINTEREST INCOME Noninterest Income [Abstract] Corporate-owned life insurance income Corporate-owned life insurance income Bank Owned Life Insurance Income OREO expense, net OREO expense, net Gains (Losses) on Sales of Other Real Estate Net securities losses (gains) Net securities gains (losses) Gain (Loss) on Sale of Securities, Net Net securities (losses) gains Net securities gains (losses) Gain (Loss) on Sale of Securities, Net Net losses (gains) from loan sales Net gains (losses) from loan sales Gain (Loss) on Sales of Loans, Net Gain (Loss) on Sales of Loans, Net, Total Service charges on deposit accounts Service charges on deposit accounts Fees and Commissions, Depositor Accounts Marketing Marketing Marketing and Advertising Expense Marketing and Advertising Expense Professional fees Professional fees Professional Fees Total interest income Total interest income Interest and Dividend Income, Operating INTEREST INCOME Interest and Dividend Income, Operating [Abstract] Operating lease income Operating lease income Operating Leases, Income Statement, Lease Revenue, Total Operating Leases, Income Statement, Lease Revenue Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Accrued income and other assets (including $121 of consolidated LIHTC guaranteed funds VIEs, see Note 7) (a) Accrued income and other assets Accrued income and other assets Other Assets Other operating activities, net Other operating activities, net Other operating activities, net Other operating activities, net Increase (Decrease) in Other Operating Assets and Liabilities, Net Net pension and postretirement benefit costs, net of income taxes Net pension and postretirement benefit costs, net of income taxes Other Comprehensive Income, Defined Benefit Plans Adjustment, Net of Tax, Period Increase (Decrease) Other Comprehensive Income, Defined Benefit Plans Adjustment, Net of Tax Foreign currency translation adjustments Other Comprehensive Income, Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total Other Comprehensive Income, Foreign Currency Transaction and Translation Adjustment, Net of Tax Net unrealized gains (losses) on derivative financial instruments, net of income taxes of ($54) and ($49), respectively Net unrealized (losses) gains on derivative financial instruments, net of income taxes of ($37) and $1 respectively Other Comprehensive Income, Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Income taxes effect on net unrealized (losses) gains on derivative financial instruments Income taxes effect on net unrealized (losses) gains on derivative financial instruments Other Comprehensive Income, Unrealized Gain (Loss) on Derivatives Arising During Period, Tax Income taxes effect on net unrealized gains on securities available for sale Income taxes effect on net unrealized (losses) gains on securities available for sale Other Comprehensive Income, Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax Accrued expense and other liabilities ($xxx,xxx,xxx relates to consolidated VIEs, see also Note X) Accrued expense and other liabilities Other Liabilities Other Liabilities, Total Other investments Other Short-term Investments Cash dividends paid Cash dividends paid Payments of Dividends Cash dividends paid Payments of Dividends Employee Benefits Employee Benefits Pension and Other Postretirement Benefits Disclosure [Text Block] Cash dividends accrued on Cumulative Series B Preferred Stock, (% per annum) Preferred Stock, Dividend Rate Preferred Stock, Dividend Rate, Percentage or Per-Dollar-Amount Preferred Stock, Shares Issued, Total Preferred Stock, Shares Issued Preferred Stock, Shares Issued, Total Ending Balance, Shares Beginning Balance, Shares Preferred Stock, Shares Outstanding Preferred Stock, Par Value Preferred Stock, Par Value Preferred Stock, Par or Stated Value Per Share Net proceeds from issuance of long-term debt Net proceeds from issuance of long-term debt Proceeds from Issuance of Long-term Debt Proceeds from Issuance of Long-term Debt Proceeds from prepayments and maturities of securities available for sale Proceeds from prepayments and maturities of securities available for sale Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities Proceeds from prepayments and maturities of held-to-maturity securities Proceeds from prepayments and maturities of held-to-maturity securities Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities Proceeds from prepayments and maturities of other investments Proceeds from prepayments and maturities of other investments Proceeds from Maturities, Prepayments and Calls of Other Investments Proceeds from sales of securities available for sale Proceeds from sales of securities available for sale Proceeds from Sale of Available-for-sale Securities Proceeds from Sale of Available-for-sale Securities Proceeds from sales of other investments Proceeds from sales of other investments Proceeds from Sale of Other Investments Proceeds from sales of premises and equipment Proceeds from sales of premises and equipment Proceeds from Sale of Property, Plant, and Equipment Proceeds from Sale of Property, Plant, and Equipment Proceeds from sales of other real estate owned Proceeds from sales of other real estate owned Proceeds from sales of other real estate owned Proceeds from Sale of Wholly Owned Real Estate and Real Estate Acquired in Settlement of Loans Premises and equipment Premises and equipment Property, Plant and Equipment, Net Premises and equipment Property, Plant and Equipment, Net, Beginning Balance Property, Plant and Equipment, Net, Ending Balance Property, Plant and Equipment, Net Provision for loan losses Provision for loan losses Provision for loan losses Provision for Loan and Lease Losses Purchases of securities available for sale Purchases of securities available for sale Payments to Acquire Available-for-sale Securities Purchases of securities available for sale Payments to Acquire Available-for-sale Securities Purchases of held-to-maturity securities Purchases of held-to-maturity securities Purchases of held-to-maturity securities Payments to Acquire Held-to-maturity Securities Purchases of other investments Purchases of other investments Purchases of other investments Payments to Acquire Other Investments Purchases of premises and equipment Purchases of premises and equipment Payments to Acquire Property, Plant, and Equipment Purchases of premises and equipment Payments to Acquire Property, Plant, and Equipment Payments on long-term debt Payments on long-term debt Repayments of Long-term Debt Payments on long-term debt Repayments of Long-term Debt Retained earnings Retained earnings Retained Earnings (Accumulated Deficit) Retained Earnings (Accumulated Deficit), Beginning Balance Retained Earnings (Accumulated Deficit), Ending Balance Retained Earnings (Accumulated Deficit) Cumulative effect adjustment to beginning balance of Retained Earnings Cumulative Effect of Initial Adoption of New Accounting Principle Line of Business Results Segment Reporting Disclosure [Text Block] Series B Preferred Stock Series A Preferred Stock Bank notes and other short-term borrowings Bank notes and other short-term borrowings Short-term Borrowings Short-term Borrowings Consolidated Statements of Cash Flows [Abstract] Consolidated Statements of Changes in Shareholders Equity [Abstract] EQUITY Stockholders' Equity Attributable to Parent [Abstract] Shareholders' Equity [Abstract] Shareholders' Equity Stockholders' Equity Note Disclosure [Text Block] Additional disclosures relative to cash flows: Supplemental Cash Flow Information [Abstract] Loans transferred to other real estate owned Loans transferred to other real estate owned Loans transferred to other real estate owned Transfer Other Real Estate Tax benefits under recognized compensation cost for stock-based awards Tax benefits over (under) recognized compensation cost for stock-based awards Excess Tax Benefit from Share-based Compensation, Financing Activities Total noninterest expense Total noninterest expense Noninterest Expense NONINTEREST EXPENSE Noninterest Expense [Abstract] Mortgage Servicing Assets [Abstract] Treasury Stock, at Cost Variable Interest Entities Schedule of Variable Interest Entities [Text Block] Weighted-average common shares and potential common shares outstanding (000) Weighted Average Number of Shares Outstanding, Diluted, Total Weighted Average Number of Shares Outstanding, Diluted Weighted-average common shares outstanding (000) Weighted-average common shares outstanding (000) Weighted Average Number of Shares Outstanding, Basic, Total Weighted Average Number of Shares Outstanding, Basic Common Shares Preferred Stock Held-to-maturity securities, Fair value Held-to-maturity securities, Fair Value Held-to-maturity Securities, Fair Value Total assets Assets Trading account assets Trading account assets Trading Securities Cash dividends declared on common shares, per share Cash dividends declared per common share Common Stock, Dividends, Per Share, Declared Common Stock, Dividends, Per Share, Declared Operating lease assets Operating lease assets Property Subject to or Available for Operating Lease, Gross Statement [Table] ASSETS Assets [Abstract] Statement [Line Items] Fair Value Measurements Fair Value Measurements Fair Value Disclosures [Text Block] Preferred Stock, Liquidation Preference Preferred Stock, Liquidation Preference Per Share Class of Stock [Domain] Mortgage Servicing Assets Transfers and Servicing of Financial Assets [Text Block] Deferred income taxes Deferred income taxes Deferred income taxes Increase (Decrease) in Deferred Income Taxes Per common share: Earnings Per Share, Basic [Abstract] Per common share - assuming dilution: Earnings Per Share, Diluted [Abstract] Earnings Per Common Share [Abstract] Earnings Per Common Share [Abstract] Basis of Presentation [Abstract] INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Cumulative Effects of Changes in Accounting Principles, Noncontrolling Interest, Total Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Cumulative Effects of Changes in Accounting Principles, Noncontrolling Interest Class of Stock [Axis] Common Shares, Par Value Common Shares, Par Value Common Stock, Par or Stated Value Per Share Treasury Stock, Shares Treasury Stock, Shares Key shareholders' equity Ending Balance Beginning Balance Key shareholders' equity Ending Balance Stockholders' Equity Attributable to Parent Income Taxes [Abstract] Income taxes Income taxes Income Tax Expense (Benefit) Income Tax Expense (Benefit) Preferred stock Preferred Stock, Value, Issued, Total Preferred Stock, Value, Issued, Beginning Balance Preferred Stock, Value, Issued, Ending Balance Preferred Stock, Value, Issued Preferred stock, $1 par value, authorized 25,000,000 shares: Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] Equipment Equipment Equipment Expense Derivative liabilities Derivative liabilities Derivative Liabilities, Total Derivative Liabilities Net losses (gains) from principal investing Net (losses) gains from principal investing Net gains (losses) from principal investing Principal Investment Gains (Losses) Statement, Equity Components [Axis] Capital Surplus Retained Earnings Accumulated Other Comprehensive Income (Loss) Equity Component [Domain] Loans transferred to held for sale from portfolio Transfer of Portfolio Loans and Leases to Held-for-sale Loans transferred to portfolio from held for sale Loans transferred to portfolio from held for sale Transfer of Loans Held-for-sale to Portfolio Loans Common shares issued Stock Issued During Period, Value, New Issues Common shares reissued - Stock options and other employee benefit plans Common shares reissued for stock options and other employee benefit plans Stock Issued During Period, Value, Share-based Compensation Common shares issued, Shares Stock Issued During Period, Shares, New Issues Common shares reissued for stock options and other employee benefit plans, Shares (000) Common shares reissued - Stock options and other employee benefit plans, Shares (000) Stock Issued During Period, Shares, Share-based Compensation Comprehensive Income (Loss) Amortization of discount on Series B Preferred Stock Increase in Carrying Amount of Redeemable Preferred Stock Noncash items: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Earnings Per Common Share Earnings Per Share [Text Block] Net income (loss) Net income (loss) NET INCOME (LOSS) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Less: Net income (loss) attributable to noncontrolling interests Less: Net income (loss) attributable to noncontrolling interests Net income (loss) attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Total comprehensive loss Total comprehensive income (loss) Comprehensive Income, Net of Tax, Including Portion Attributable to Noncontrolling Interest Total equity Beginning Balance Ending Balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Noncontroling Interests Noncontrolling Interests Parent [Member] Cash dividends declared on common shares ($.0825 per share) and ($.03 per share) respectively Dividends, Common Stock, Cash Cash dividends declared on preferred stock Dividends, Preferred Stock, Cash Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Other comprehensive income (loss): Amendment Flag Current Fiscal Year End Date Document Period End Date Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Entity Public Float (actual number) Entity Public Float Entity Registrant Name Entity Central Index Key Entity Common Stock, Shares Outstanding (actual number) Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Period Focus Document Type