Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
OPERATING ACTIVITIES
Net income (loss)	$ 907us-gaap_ProfitLoss	$ 910us-gaap_ProfitLoss	$ 865us-gaap_ProfitLoss
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Provision (credit) for loan and lease losses	59us-gaap_ProvisionForLoanAndLeaseLosses	130us-gaap_ProvisionForLoanAndLeaseLosses	229us-gaap_ProvisionForLoanAndLeaseLosses
Provision (credit) for losses on lending-related commitments	(2)us-gaap_ProvisionForOtherCreditLosses	8us-gaap_ProvisionForOtherCreditLosses	(16)us-gaap_ProvisionForOtherCreditLosses
Provision (credit) for losses on LIHTC guaranteed funds	(7)	4
Depreciation, amortization and accretion expense, net	227	220	235
Increase in cash surrender value of corporate-owned life insurance	(106)	(106)	(110)
Stock-based compensation expense	44us-gaap_ShareBasedCompensation	35us-gaap_ShareBasedCompensation	49us-gaap_ShareBasedCompensation
FDIC reimbursement (payments), net of FDIC expense	1	296	26
Deferred income taxes (benefit)	5	29	35
Proceeds from sales of loans held for sale	5,386	5,595	5,535
Originations of loans held for sale, net of repayments	(5,415)	(5,440)	(5,189)
Net losses (gains) from sale of loans held for sale	(97)us-gaap_GainLossOnSalesOfLoansNet	(115)us-gaap_GainLossOnSalesOfLoansNet	(144)us-gaap_GainLossOnSalesOfLoansNet
Net losses (gains) from principal investing	(78)us-gaap_PrincipalInvestmentGainsLosses	(52)us-gaap_PrincipalInvestmentGainsLosses	(72)us-gaap_PrincipalInvestmentGainsLosses
Net losses (gains) and writedown on OREO	3	6	13
Net losses (gains) on leased equipment	(35)key_GainsLossesOnLeasedEquipment	(43)key_GainsLossesOnLeasedEquipment	(111)key_GainsLossesOnLeasedEquipment
Net losses (gains) on sales of fixed assets	7us-gaap_GainLossOnDispositionOfAssets	12us-gaap_GainLossOnDispositionOfAssets	2us-gaap_GainLossOnDispositionOfAssets
Net securities losses (gains)		(1)us-gaap_GainLossOnSaleOfSecuritiesNet
Gain on sale of Victory	(10)us-gaap_GainLossOnSaleOfInvestments	(146)us-gaap_GainLossOnSaleOfInvestments
Loss on sale of residual interests and deconsolidation of securitization trusts	40us-gaap_GainLossOnSalesOfConsumerLoans
Net decrease (increase) in trading account assets	(12)	(133)	18
Other operating activities, net	403	338	(66)
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	1,320	1,547	1,299
INVESTING ACTIVITIES
Cash received (used) in acquisitions, net of cash acquired	(114)	601	776
Proceeds from sale of residual interests	57
Proceeds from sale of Victory	10	131
Net decrease (increase) in short-term investments, excluding acquisitions	1,358key_NetDecreaseInShortTermInvestments	(1,650)key_NetDecreaseInShortTermInvestments	(421)key_NetDecreaseInShortTermInvestments
Purchases of securities available for sale	(3,797)	(5,222)	(1,772)
Proceeds from sales of securities available for sale		35	1
Proceeds from prepayments and maturities of securities available for sale	2,860	4,470	5,551
Proceeds from prepayments and maturities of held-to-maturity securities	850	847	660
Purchases of held-to-maturity securities	(1,109)	(1,672)	(2,481)
Purchases of other investments	(49)	(46)	(66)
Proceeds from sales of other investments	334	187	28
Proceeds from prepayments and maturities of other investments	4	6	197
Net decrease (increase) in loans, excluding acquisitions, sales and transfers	(3,296)	(2,026)	(2,935)
Proceeds from sales of portfolio loans	120	185	277
Proceeds from corporate-owned life insurance	35	31	33
Purchases of premises, equipment, and software	(97)	(100)	(164)
Proceeds from sales of premises and equipment	1	8	1
Proceeds from sales of other real estate owned	17	23	67
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	(2,816)	(4,192)	(248)
FINANCING ACTIVITIES
Net increase (decrease) in deposits, excluding acquisitions	2,736us-gaap_IncreaseDecreaseInDeposits	2,333us-gaap_IncreaseDecreaseInDeposits	1,989us-gaap_IncreaseDecreaseInDeposits
Net increase (decrease) in short-term borrowings	(879)	(18)	(152)
Net proceeds from issuance of long-term debt	1,727	2,573	837
Payments on long-term debt	(1,355)us-gaap_RepaymentsOfLongTermDebt	(1,545)us-gaap_RepaymentsOfLongTermDebt	(3,394)us-gaap_RepaymentsOfLongTermDebt
Repurchase of common shares	(484)	(474)	(251)
Net proceeds from reissuance of common shares	27	26	2
Cash dividends paid	(240)us-gaap_PaymentsOfDividends	(217)us-gaap_PaymentsOfDividends	(191)us-gaap_PaymentsOfDividends
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	1,532	2,678	(1,160)
NET INCREASE (DECREASE) IN CASH AND DUE FROM BANKS	36	33	(109)
CASH AND DUE FROM BANKS AT BEGINNING OF YEAR	617us-gaap_CashAndDueFromBanks	584us-gaap_CashAndDueFromBanks	693us-gaap_CashAndDueFromBanks
CASH AND DUE FROM BANKS AT END OF YEAR	653us-gaap_CashAndDueFromBanks	617us-gaap_CashAndDueFromBanks	584us-gaap_CashAndDueFromBanks
Additional disclosures relative to cash flows:
Interest paid	281us-gaap_InterestPaidNet	293us-gaap_InterestPaidNet	464us-gaap_InterestPaidNet
Income taxes paid (refunded)	131us-gaap_IncomeTaxesPaidNet	185us-gaap_IncomeTaxesPaidNet	84us-gaap_IncomeTaxesPaidNet
Noncash items:
Assets acquired	41us-gaap_FairValueOfAssetsAcquired	41us-gaap_FairValueOfAssetsAcquired	1,283us-gaap_FairValueOfAssetsAcquired
Liabilities assumed	17us-gaap_LiabilitiesAssumed1		2,059us-gaap_LiabilitiesAssumed1
Reduction of secured borrowing and related collateral	152
LIHTC guaranteed funds put	7
Loans transferred to portfolio from held for sale	19	9	41
Loans transferred to held for sale from portfolio	16	61	118
Loans transferred to other real estate owned	$ 23us-gaap_TransferOfOtherRealEstate	$ 21us-gaap_TransferOfOtherRealEstate	$ 38us-gaap_TransferOfOtherRealEstate

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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.

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Amount of cash outflow through purchase of long-term held-to-maturity securities.

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The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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The cash inflow from the sale of investment projects held by an entity in hopes of getting a future return or interest from it.

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The cash inflow from Sales of Loans Held For Investment.

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The cash inflow associated with the sale of other investments not otherwise defined in the taxonomy.

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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.

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Amount of expense related to estimated loss from loan and lease transactions.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Value of loans held-for-sale transferred to loans held in the entity's portfolio in noncash transactions.

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