Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
OPERATING ACTIVITIES
Net income (loss)	$ 235us-gaap_ProfitLoss	$ 242us-gaap_ProfitLoss
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Provision for credit losses	35	4
Provision (credit) for losses on LIHTC guaranteed funds		(6)
Depreciation, amortization and accretion expense, net	50	52
Increase in cash surrender value of corporate-owned life insurance	(25)	(24)
Stock-based compensation expense	13us-gaap_ShareBasedCompensation	11us-gaap_ShareBasedCompensation
Deferred income taxes (benefit)	50	40
Proceeds from sales of loans held for sale	1,225	611
Originations of loans held for sale, net of repayments	(2,109)	(383)
Net losses (gains) on sales of loans held for sale	(20)us-gaap_GainLossOnSalesOfLoansNet	(15)us-gaap_GainLossOnSalesOfLoansNet
Net losses (gains) from principal investing	(29)us-gaap_PrincipalInvestmentGainsLosses	(24)us-gaap_PrincipalInvestmentGainsLosses
Net losses (gains) on leased equipment	(3)key_GainsLossesOnLeasedEquipment	(14)key_GainsLossesOnLeasedEquipment
Net decrease (increase) in trading account assets	(39)	(102)
Other operating activities, net	(485)	(236)
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	(1,102)	156
INVESTING ACTIVITIES
Net decrease (increase) in short-term investments, excluding acquisitions	891key_NetDecreaseInShortTermInvestments	2,668key_NetDecreaseInShortTermInvestments
Purchases of securities available for sale	(403)	(618)
Proceeds from prepayments and maturities of securities available for sale	724	650
Proceeds from prepayments and maturities of held-to-maturity securities	266	180
Purchases of held-to-maturity securities	(257)	(250)
Purchases of other investments	(13)	(17)
Proceeds from sales of other investments	32	122
Proceeds from prepayments and maturities of other investments	4	2
Net decrease (increase) in loans, excluding acquisitions, sales and transfers	(727)	(1,029)
Proceeds from sales of portfolio loans	47	21
Proceeds from corporate-owned life insurance	15	6
Purchases of premises, equipment, and software	(3)	(11)
Proceeds from sales of premises and equipment		1
Proceeds from sales of other real estate owned	6	5
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	582	1,730
FINANCING ACTIVITIES
Net increase (decrease) in deposits, excluding acquisitions	(376)us-gaap_IncreaseDecreaseInDeposits	(1,996)us-gaap_IncreaseDecreaseInDeposits
Net increase (decrease) in short-term borrowings	127	4
Net proceeds from issuance of long-term debt	1,000	78
Payments on long-term debt	(129)us-gaap_RepaymentsOfLongTermDebt	(10)us-gaap_RepaymentsOfLongTermDebt
Repurchase of common shares	(197)	(130)
Net proceeds from reissuance of common shares	9	15
Cash dividends paid	(61)us-gaap_PaymentsOfDividends	(55)us-gaap_PaymentsOfDividends
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	373	(2,094)
NET INCREASE (DECREASE) IN CASH AND DUE FROM BANKS	(147)	(208)
CASH AND DUE FROM BANKS AT BEGINNING OF PERIOD	653us-gaap_CashAndDueFromBanks	617us-gaap_CashAndDueFromBanks
CASH AND DUE FROM BANKS AT END OF PERIOD	506us-gaap_CashAndDueFromBanks	409us-gaap_CashAndDueFromBanks
Additional disclosures relative to cash flows:
Interest paid	89us-gaap_InterestPaidNet	103us-gaap_InterestPaidNet
Income taxes paid (refunded)	19us-gaap_IncomeTaxesPaidNet	10us-gaap_IncomeTaxesPaidNet
Noncash items:
Reduction of secured borrowing and related collateral	72	6
Loans transferred to portfolio from held for sale		2
Loans transferred to held for sale from portfolio	10	5
Loans transferred to other real estate owned	$ 7us-gaap_TransferOfOtherRealEstate	$ 3us-gaap_TransferOfOtherRealEstate

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