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Asset Quality - Nonperforming Assets and Past Due Loans (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Receivables [Abstract]    
Total nonperforming loans $ 418key_NonPerformingLoans $ 508key_NonPerformingLoans
Nonperforming loans held for sale   1key_NonperformingLoansHeldForSale
OREO 18key_OtherRealEstateOwnedNonperformingLoan 15key_OtherRealEstateOwnedNonperformingLoan
Other nonperforming assets   7key_OtherNonperformingAssets
Total nonperforming assets 436key_NonPerformingAssets 531key_NonPerformingAssets
Nonperforming assets from discontinued operations - education lending 11key_NonperformingAssetsFromDiscontinuedOperation 25key_NonperformingAssetsFromDiscontinuedOperation
Restructured loans included in nonperforming loans 157key_RestructuredLoansIncludedInNonaccrualLoans 214key_RestructuredLoansIncludedInNonaccrualLoans
Restructured loans with an allocated specific allowance 82key_RestructuredLoansWithSpecificallyAllocatedAllowance 71key_RestructuredLoansWithSpecificallyAllocatedAllowance
Specifically allocated allowance for restructured loans 34key_SpecificallyAllocatedAllowanceForRestructuredLoans 35key_SpecificallyAllocatedAllowanceForRestructuredLoans
Accruing loans past due 90 days or more 96us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing 71us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
Accruing loans past due 30 through 89 days $ 235key_LoansAndLeasesReceivableImpairedNonperformingThirtyThroughEightyNineDaysAccrualOfInterest $ 318key_LoansAndLeasesReceivableImpairedNonperformingThirtyThroughEightyNineDaysAccrualOfInterest