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Acquisitions and Discontinued Operations - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended 9 Months Ended 3 Months Ended
Mar. 31, 2015
SecurityLoan
Trust
Mar. 31, 2014
SecurityLoan
Dec. 31, 2014
SecurityLoan
Sep. 30, 2014
Trust
Jun. 30, 2014
Dec. 31, 2009
Trust
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Estimated goodwill $ 1,057,000,000us-gaap_Goodwill $ 979,000,000us-gaap_Goodwill $ 1,057,000,000us-gaap_Goodwill      
Trust assets removed 2,246,000,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation 4,427,000,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation 2,324,000,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation      
Trust liabilities removed   1,819,000,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation 3,000,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation      
Allowance for loan held as investment 794,000,000us-gaap_LoansAndLeasesReceivableAllowance 834,000,000us-gaap_LoansAndLeasesReceivableAllowance 794,000,000us-gaap_LoansAndLeasesReceivableAllowance      
Number of TDRs 4,740us-gaap_FinancingReceivableModificationsNumberOfContracts2 4,858us-gaap_FinancingReceivableModificationsNumberOfContracts2 4,776us-gaap_FinancingReceivableModificationsNumberOfContracts2      
Loans purchased 186,000,000us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized          
Loans at fair value 187,000,000us-gaap_LoansReceivableFairValueDisclosure 143,000,000us-gaap_LoansReceivableFairValueDisclosure 191,000,000us-gaap_LoansReceivableFairValueDisclosure      
Number of outstanding securitizations trusts 3key_NumberOfOutstandingSecuritizationTrustsUsedToPurchaseLoan          
Cash portion in gain   6,000,000key_FairValueOfExpectedCashGainLossFromDisposalOfDiscontinuedOperation        
Pacific Crest Securities [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Business acquisition, date of acquisition Sep. 03, 2014          
Business acquisition intangible asset     13,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= key_PacificCrestSecuritiesMember
     
Estimated goodwill     78,000,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= key_PacificCrestSecuritiesMember
     
Number of outstanding securitization trusts       3key_NumberOfOutstandingSecuritizationTrusts
/ us-gaap_BusinessAcquisitionAxis
= key_PacificCrestSecuritiesMember
   
Proceeds from sale of residual interests       57,000,000us-gaap_ProceedsFromCollectionOfRetainedInterestInSecuritizedReceivablesCategorizedAsAvailableForSale
/ us-gaap_BusinessAcquisitionAxis
= key_PacificCrestSecuritiesMember
   
After tax loss recognized       25,000,000us-gaap_DeconsolidationRevaluationOfRetainedInvestmentGainOrLossAmount
/ us-gaap_BusinessAcquisitionAxis
= key_PacificCrestSecuritiesMember
   
Estimated fair value of the assets and deposits acquired       1,000,000key_BusinessAcquisitionEstimatedFairValueOfAssetAndDeposits
/ us-gaap_BusinessAcquisitionAxis
= key_PacificCrestSecuritiesMember
   
Number of continuing securitization trusts       8key_NumberOfContinuingSecuritizationTrusts
/ us-gaap_BusinessAcquisitionAxis
= key_PacificCrestSecuritiesMember
   
Trust [Member] | Pacific Crest Securities [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Trust assets removed       1,700,000,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
/ us-gaap_BalanceSheetLocationAxis
= key_TrustMember
/ us-gaap_BusinessAcquisitionAxis
= key_PacificCrestSecuritiesMember
   
Trust liabilities removed       1,600,000,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation
/ us-gaap_BalanceSheetLocationAxis
= key_TrustMember
/ us-gaap_BusinessAcquisitionAxis
= key_PacificCrestSecuritiesMember
   
Discontinued Operations [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Number of outstanding securitization trusts           10key_NumberOfOutstandingSecuritizationTrusts
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
Trust assets removed 2,246,000,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
4,427,000,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
2,324,000,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
     
Trust liabilities removed   1,819,000,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
3,000,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
     
Economic interest or risk of loss associated with education loan securitization trusts 0key_RiskAssociatedWithSecuritizationTrusts
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
         
Fair value of loans and securities in securitization trusts after tax loss         22,000,000us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
 
Discontinued Operations [Member] | Trust [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Loans at fair value   1,893,000,000us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_BalanceSheetLocationAxis
= key_TrustMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
       
Education Loans [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Investment recorded 1,604,000,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= key_EducationLoansMember
         
Allowance for loan held as investment $ 18,000,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= key_EducationLoansMember
         
Number of TDRs 1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= key_EducationLoansMember