Document
false--12-31Q220182018-06-300000091576Large Accelerated Filer0.040.0250.025KEYCORP /NEW/KEY0100000010000000000010000000000070000000.030000.01240.030000.01190.0200.00290.020000.00220.03100.01500.02500.03820.02400.031038500000000333500000015000000076000000145700000082180000385000000004385000000150000000760000001431000000823800000.500.23000.06000.06000.06002000000P0Y11140000000014000000001256702081125670208100100000010000000.01400.01280.00740.00250.00200.00500.02190.0131P1Y1000000073600000068400000004000000110000004000000240000003000000400000030000003000000100000030000001000000200000020000000240000002000000067000000001.93750.539063250.778386250.7656262100050000021000500000210005000000.15000.07000.08800.15000.07000.09060.03000.110.01000.0850.01300.08550.03000.110.01000.0850.01170.08540.21720.07850.09420.49390.08390.09171876178321977579264000000 0000091576 2018-01-01 2018-06-30 0000091576 2018-07-31 0000091576 2018-06-30 0000091576 2017-12-31 0000091576 us-gaap:ResidentialMortgageMember 2017-12-31 0000091576 us-gaap:ResidentialMortgageMember 2018-06-30 0000091576 2017-01-01 2017-06-30 0000091576 2017-04-01 2017-06-30 0000091576 2018-04-01 2018-06-30 0000091576 us-gaap:RetainedEarningsMember 2018-01-01 2018-06-30 0000091576 us-gaap:AdditionalPaidInCapitalMember 2017-06-30 0000091576 us-gaap:AdditionalPaidInCapitalMember 2018-06-30 0000091576 us-gaap:NoncontrollingInterestMember 2018-06-30 0000091576 us-gaap:AdditionalPaidInCapitalMember 2017-12-31 0000091576 us-gaap:CommonStockMember 2018-01-01 2018-06-30 0000091576 us-gaap:PreferredStockMember 2017-01-01 2017-06-30 0000091576 us-gaap:PreferredStockMember 2017-06-30 0000091576 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2017-12-31 0000091576 us-gaap:AdditionalPaidInCapitalMember 2017-01-01 2017-06-30 0000091576 us-gaap:TreasuryStockMember 2017-06-30 0000091576 us-gaap:PreferredStockMember 2016-12-31 0000091576 us-gaap:PreferredStockMember 2017-12-31 0000091576 us-gaap:RetainedEarningsMember 2018-06-30 0000091576 us-gaap:NoncontrollingInterestMember 2017-12-31 0000091576 us-gaap:PreferredStockMember 2018-06-30 0000091576 us-gaap:SeriesCPreferredStockMember us-gaap:RetainedEarningsMember 2017-01-01 2017-06-30 0000091576 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2018-01-01 2018-06-30 0000091576 us-gaap:RetainedEarningsMember 2017-06-30 0000091576 us-gaap:CommonStockMember 2017-01-01 2017-06-30 0000091576 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2017-01-01 2017-06-30 0000091576 us-gaap:AdditionalPaidInCapitalMember 2016-12-31 0000091576 us-gaap:TreasuryStockMember 2016-12-31 0000091576 us-gaap:TreasuryStockMember 2017-01-01 2017-06-30 0000091576 us-gaap:SeriesEPreferredStockMember us-gaap:RetainedEarningsMember 2018-01-01 2018-06-30 0000091576 us-gaap:AdditionalPaidInCapitalMember 2018-01-01 2018-06-30 0000091576 us-gaap:SeriesEPreferredStockMember us-gaap:RetainedEarningsMember 2017-01-01 2017-06-30 0000091576 us-gaap:RetainedEarningsMember 2017-12-31 0000091576 us-gaap:CommonStockMember 2017-06-30 0000091576 us-gaap:CommonStockMember 2016-12-31 0000091576 us-gaap:TreasuryStockMember 2018-01-01 2018-06-30 0000091576 us-gaap:CommonStockMember 2018-06-30 0000091576 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2016-12-31 0000091576 us-gaap:TreasuryStockMember 2018-06-30 0000091576 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2017-06-30 0000091576 us-gaap:CommonStockMember 2017-12-31 0000091576 us-gaap:NoncontrollingInterestMember 2017-01-01 2017-06-30 0000091576 us-gaap:NoncontrollingInterestMember 2016-12-31 0000091576 us-gaap:NoncontrollingInterestMember 2018-01-01 2018-06-30 0000091576 us-gaap:NoncontrollingInterestMember 2017-06-30 0000091576 us-gaap:SeriesDPreferredStockMember us-gaap:RetainedEarningsMember 2017-01-01 2017-06-30 0000091576 us-gaap:SeriesDPreferredStockMember us-gaap:RetainedEarningsMember 2018-01-01 2018-06-30 0000091576 us-gaap:TreasuryStockMember 2017-12-31 0000091576 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2018-06-30 0000091576 us-gaap:RetainedEarningsMember 2017-01-01 2017-06-30 0000091576 us-gaap:SeriesAPreferredStockMember us-gaap:RetainedEarningsMember 2017-01-01 2017-06-30 0000091576 us-gaap:RetainedEarningsMember 2016-12-31 0000091576 us-gaap:SeriesDPreferredStockMember 2018-01-01 2018-06-30 0000091576 us-gaap:SeriesCPreferredStockMember 2017-01-01 2017-06-30 0000091576 us-gaap:SeriesDPreferredStockMember 2017-01-01 2017-06-30 0000091576 us-gaap:SeriesAPreferredStockMember 2017-01-01 2017-06-30 0000091576 us-gaap:SeriesEPreferredStockMember 2018-01-01 2018-06-30 0000091576 us-gaap:SeriesEPreferredStockMember 2017-01-01 2017-06-30 0000091576 2016-12-31 0000091576 2017-06-30 0000091576 key:CommercialCreditCardMember 2018-06-30 0000091576 key:EducationLendingMember us-gaap:SegmentDiscontinuedOperationsMember 2017-12-31 0000091576 key:EducationLendingMember us-gaap:SegmentDiscontinuedOperationsMember 2018-06-30 0000091576 key:CommercialCreditCardMember 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember 2017-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember 2017-12-31 0000091576 2018-03-31 0000091576 2017-03-31 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember key:CriticizedNonaccruingMember 2017-12-31 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember key:CommercialLeasesMember key:CriticizedNonaccruingMember 2017-12-31 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember us-gaap:PassMember 2017-12-31 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember key:CommercialFinancialAndAgriculturalMember key:CriticizedNonaccruingMember 2018-06-30 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember key:CommercialLeasesMember key:CriticizedNonaccruingMember 2018-06-30 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember us-gaap:ConstructionLoansMember key:CriticizedAccruingMember 2018-06-30 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember key:CommercialFinancialAndAgriculturalMember key:CriticizedNonaccruingMember 2017-12-31 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember key:CriticizedAccruingMember 2018-06-30 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember key:CommercialRealEstateLoansMember us-gaap:PassMember 2018-06-30 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember key:CommercialRealEstateLoansMember us-gaap:PassMember 2017-12-31 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember key:CommercialLeasesMember us-gaap:PassMember 2018-06-30 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember key:CommercialFinancialAndAgriculturalMember key:CriticizedAccruingMember 2018-06-30 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember key:CommercialRealEstateLoansMember 2018-06-30 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember us-gaap:ConstructionLoansMember us-gaap:PassMember 2018-06-30 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember key:CriticizedNonaccruingMember 2018-06-30 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember us-gaap:ConstructionLoansMember 2017-12-31 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember key:CommercialLeasesMember 2017-12-31 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember us-gaap:ConstructionLoansMember key:CriticizedAccruingMember 2017-12-31 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember 2018-06-30 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember us-gaap:ConstructionLoansMember key:CriticizedNonaccruingMember 2017-12-31 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember key:CommercialLeasesMember key:CriticizedAccruingMember 2018-06-30 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember key:CommercialLeasesMember us-gaap:PassMember 2017-12-31 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember key:CommercialRealEstateLoansMember key:CriticizedAccruingMember 2018-06-30 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember key:CommercialRealEstateLoansMember key:CriticizedNonaccruingMember 2018-06-30 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember key:CommercialLeasesMember key:CriticizedAccruingMember 2017-12-31 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember us-gaap:ConstructionLoansMember us-gaap:PassMember 2017-12-31 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember key:CriticizedAccruingMember 2017-12-31 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember us-gaap:ConstructionLoansMember key:CriticizedNonaccruingMember 2018-06-30 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember key:CommercialFinancialAndAgriculturalMember key:CriticizedAccruingMember 2017-12-31 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember key:CommercialRealEstateLoansMember 2017-12-31 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember us-gaap:PassMember 2018-06-30 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember key:CommercialFinancialAndAgriculturalMember 2018-06-30 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember key:CommercialRealEstateLoansMember key:CriticizedAccruingMember 2017-12-31 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember key:CommercialFinancialAndAgriculturalMember us-gaap:PassMember 2018-06-30 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember key:CommercialFinancialAndAgriculturalMember us-gaap:PassMember 2017-12-31 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember key:CommercialRealEstateLoansMember key:CriticizedNonaccruingMember 2017-12-31 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember key:CommercialLeasesMember 2018-06-30 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember us-gaap:ConstructionLoansMember 2018-06-30 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember key:CommercialFinancialAndAgriculturalMember 2017-12-31 0000091576 key:CommercialPortfolioSegmentExcludingPciLoansMember 2017-12-31 0000091576 us-gaap:SegmentContinuingOperationsMember 2017-04-01 2017-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:HomeEquityLoanMember us-gaap:SegmentContinuingOperationsMember 2017-04-01 2017-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateCommercialMortgageMember us-gaap:SegmentContinuingOperationsMember 2017-03-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:RealEstateResidentialMortgageMember us-gaap:SegmentContinuingOperationsMember 2017-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:RealEstateResidentialMortgageMember us-gaap:SegmentContinuingOperationsMember 2017-04-01 2017-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateCommercialMortgageMember us-gaap:SegmentContinuingOperationsMember 2017-04-01 2017-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:HomeEquityLoanMember us-gaap:SegmentContinuingOperationsMember 2017-03-31 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialLeaseFinancingMember us-gaap:SegmentContinuingOperationsMember 2017-04-01 2017-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerIndirectLoansMember us-gaap:SegmentContinuingOperationsMember 2017-03-31 0000091576 us-gaap:SegmentDiscontinuedOperationsMember 2017-04-01 2017-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialFinancialAndAgriculturalMember us-gaap:SegmentContinuingOperationsMember 2017-04-01 2017-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialFinancialAndAgriculturalMember us-gaap:SegmentContinuingOperationsMember 2017-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerCreditCardMember us-gaap:SegmentContinuingOperationsMember 2017-04-01 2017-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:RealEstateResidentialMortgageMember us-gaap:SegmentContinuingOperationsMember 2017-03-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerIndirectLoansMember us-gaap:SegmentContinuingOperationsMember 2017-04-01 2017-06-30 0000091576 us-gaap:SegmentDiscontinuedOperationsMember 2017-03-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerDirectLoansMember us-gaap:SegmentContinuingOperationsMember 2017-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:CommercialRealEstateMember us-gaap:SegmentContinuingOperationsMember 2017-03-31 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:CommercialRealEstateMember us-gaap:SegmentContinuingOperationsMember 2017-04-01 2017-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerCreditCardMember us-gaap:SegmentContinuingOperationsMember 2017-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:ConsumerPortfolioSegmentMember us-gaap:SegmentContinuingOperationsMember 2017-04-01 2017-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:SegmentContinuingOperationsMember 2017-04-01 2017-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:ConstructionLoansMember us-gaap:SegmentContinuingOperationsMember 2017-04-01 2017-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:SegmentContinuingOperationsMember 2017-03-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerDirectLoansMember us-gaap:SegmentContinuingOperationsMember 2017-04-01 2017-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerCreditCardMember us-gaap:SegmentContinuingOperationsMember 2017-03-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:ConsumerPortfolioSegmentMember us-gaap:SegmentContinuingOperationsMember 2017-03-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerDirectLoansMember us-gaap:SegmentContinuingOperationsMember 2017-03-31 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialFinancialAndAgriculturalMember us-gaap:SegmentContinuingOperationsMember 2017-03-31 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialLeaseFinancingMember us-gaap:SegmentContinuingOperationsMember 2017-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:ConsumerPortfolioSegmentMember us-gaap:SegmentContinuingOperationsMember 2017-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:SegmentContinuingOperationsMember 2017-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:ConstructionLoansMember us-gaap:SegmentContinuingOperationsMember 2017-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:HomeEquityLoanMember us-gaap:SegmentContinuingOperationsMember 2017-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateCommercialMortgageMember us-gaap:SegmentContinuingOperationsMember 2017-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialLeaseFinancingMember us-gaap:SegmentContinuingOperationsMember 2017-03-31 0000091576 us-gaap:SegmentDiscontinuedOperationsMember 2017-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerIndirectLoansMember us-gaap:SegmentContinuingOperationsMember 2017-06-30 0000091576 us-gaap:SegmentContinuingOperationsMember 2017-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:ConstructionLoansMember us-gaap:SegmentContinuingOperationsMember 2017-03-31 0000091576 us-gaap:SegmentContinuingOperationsMember 2017-03-31 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:CommercialRealEstateMember us-gaap:SegmentContinuingOperationsMember 2017-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialFinancialAndAgriculturalMember us-gaap:SegmentContinuingOperationsMember 2017-01-01 2017-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialLeaseFinancingMember us-gaap:SegmentContinuingOperationsMember 2017-01-01 2017-06-30 0000091576 us-gaap:SegmentDiscontinuedOperationsMember 2017-01-01 2017-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:ConstructionLoansMember us-gaap:SegmentContinuingOperationsMember 2017-01-01 2017-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:HomeEquityLoanMember us-gaap:SegmentContinuingOperationsMember 2017-01-01 2017-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:RealEstateResidentialMortgageMember us-gaap:SegmentContinuingOperationsMember 2017-01-01 2017-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:CommercialRealEstateMember us-gaap:SegmentContinuingOperationsMember 2017-01-01 2017-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:ConsumerPortfolioSegmentMember us-gaap:SegmentContinuingOperationsMember 2017-01-01 2017-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerCreditCardMember us-gaap:SegmentContinuingOperationsMember 2017-01-01 2017-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateCommercialMortgageMember us-gaap:SegmentContinuingOperationsMember 2016-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:SegmentContinuingOperationsMember 2017-01-01 2017-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerIndirectLoansMember us-gaap:SegmentContinuingOperationsMember 2017-01-01 2017-06-30 0000091576 us-gaap:SegmentDiscontinuedOperationsMember 2016-12-31 0000091576 us-gaap:SegmentContinuingOperationsMember 2016-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerDirectLoansMember us-gaap:SegmentContinuingOperationsMember 2017-01-01 2017-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:RealEstateResidentialMortgageMember us-gaap:SegmentContinuingOperationsMember 2016-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerCreditCardMember us-gaap:SegmentContinuingOperationsMember 2016-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialLeaseFinancingMember us-gaap:SegmentContinuingOperationsMember 2016-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:SegmentContinuingOperationsMember 2016-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:HomeEquityLoanMember us-gaap:SegmentContinuingOperationsMember 2016-12-31 0000091576 us-gaap:SegmentContinuingOperationsMember 2017-01-01 2017-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:ConsumerPortfolioSegmentMember us-gaap:SegmentContinuingOperationsMember 2016-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:ConstructionLoansMember us-gaap:SegmentContinuingOperationsMember 2016-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateCommercialMortgageMember us-gaap:SegmentContinuingOperationsMember 2017-01-01 2017-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerDirectLoansMember us-gaap:SegmentContinuingOperationsMember 2016-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialFinancialAndAgriculturalMember us-gaap:SegmentContinuingOperationsMember 2016-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:CommercialRealEstateMember us-gaap:SegmentContinuingOperationsMember 2016-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerIndirectLoansMember us-gaap:SegmentContinuingOperationsMember 2016-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateCommercialMortgageMember 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateConstructionMember us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialFinancialAndAgriculturalMember us-gaap:FinancingReceivables30To59DaysPastDueMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerIndirectLoansMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerDirectLoansMember us-gaap:FinancingReceivables30To59DaysPastDueMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:FinancingReceivables60To89DaysPastDueMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:CreditCardReceivablesMember us-gaap:FinancingReceivables30To59DaysPastDueMember 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialFinancialAndAgriculturalMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerDirectLoansMember 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialFinancialAndAgriculturalMember us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialLeaseFinancingMember 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateConstructionMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:RealEstateResidentialMortgageMember 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateConstructionMember us-gaap:FinancingReceivables60To89DaysPastDueMember 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:FinancingReceivables30To59DaysPastDueMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:ConsumerPortfolioSegmentMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:RealEstateResidentialMortgageMember us-gaap:FinancingReceivables60To89DaysPastDueMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerDirectLoansMember us-gaap:FinancingReceivables60To89DaysPastDueMember 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialLeaseFinancingMember us-gaap:FinancingReceivables60To89DaysPastDueMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:CreditCardReceivablesMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:HomeEquityLoanMember us-gaap:FinancingReceivables30To59DaysPastDueMember 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateLoansMember 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:CommercialPortfolioSegmentMember 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:FinancingReceivables60To89DaysPastDueMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:HomeEquityLoanMember 2018-06-30 0000091576 us-gaap:FinancingReceivables30To59DaysPastDueMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:CreditCardReceivablesMember us-gaap:FinancingReceivables60To89DaysPastDueMember 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialLeaseFinancingMember us-gaap:FinancingReceivables30To59DaysPastDueMember 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateLoansMember us-gaap:FinancingReceivables60To89DaysPastDueMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerIndirectLoansMember us-gaap:FinancingReceivables60To89DaysPastDueMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerIndirectLoansMember us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateLoansMember us-gaap:FinancingReceivables30To59DaysPastDueMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:HomeEquityLoanMember us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateCommercialMortgageMember us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateConstructionMember us-gaap:FinancingReceivables30To59DaysPastDueMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:RealEstateResidentialMortgageMember us-gaap:FinancingReceivables30To59DaysPastDueMember 2018-06-30 0000091576 us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerIndirectLoansMember us-gaap:FinancingReceivables30To59DaysPastDueMember 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateCommercialMortgageMember us-gaap:FinancingReceivables30To59DaysPastDueMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:HomeEquityLoanMember us-gaap:FinancingReceivables60To89DaysPastDueMember 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateLoansMember us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:FinancingReceivables30To59DaysPastDueMember 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialFinancialAndAgriculturalMember us-gaap:FinancingReceivables60To89DaysPastDueMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:RealEstateResidentialMortgageMember us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialLeaseFinancingMember us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateCommercialMortgageMember us-gaap:FinancingReceivables60To89DaysPastDueMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerDirectLoansMember us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:CreditCardReceivablesMember us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember 2018-06-30 0000091576 us-gaap:FinancingReceivables60To89DaysPastDueMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerDirectLoansMember us-gaap:SegmentContinuingOperationsMember 2018-01-01 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:HomeEquityLoanMember us-gaap:SegmentContinuingOperationsMember 2018-01-01 2018-06-30 0000091576 us-gaap:SegmentDiscontinuedOperationsMember 2017-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:ConstructionLoansMember us-gaap:SegmentContinuingOperationsMember 2018-01-01 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialLeaseFinancingMember us-gaap:SegmentContinuingOperationsMember 2017-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:SegmentContinuingOperationsMember 2018-01-01 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateCommercialMortgageMember us-gaap:SegmentContinuingOperationsMember 2018-01-01 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerCreditCardMember us-gaap:SegmentContinuingOperationsMember 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:CommercialRealEstateMember us-gaap:SegmentContinuingOperationsMember 2018-01-01 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialFinancialAndAgriculturalMember us-gaap:SegmentContinuingOperationsMember 2018-01-01 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:ConsumerPortfolioSegmentMember us-gaap:SegmentContinuingOperationsMember 2018-01-01 2018-06-30 0000091576 us-gaap:SegmentDiscontinuedOperationsMember 2018-01-01 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerIndirectLoansMember us-gaap:SegmentContinuingOperationsMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:RealEstateResidentialMortgageMember us-gaap:SegmentContinuingOperationsMember 2018-01-01 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateCommercialMortgageMember us-gaap:SegmentContinuingOperationsMember 2017-12-31 0000091576 us-gaap:SegmentContinuingOperationsMember 2018-01-01 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialLeaseFinancingMember us-gaap:SegmentContinuingOperationsMember 2018-01-01 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:ConstructionLoansMember us-gaap:SegmentContinuingOperationsMember 2018-06-30 0000091576 us-gaap:SegmentContinuingOperationsMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerDirectLoansMember us-gaap:SegmentContinuingOperationsMember 2017-12-31 0000091576 us-gaap:SegmentContinuingOperationsMember 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:RealEstateResidentialMortgageMember us-gaap:SegmentContinuingOperationsMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:ConsumerPortfolioSegmentMember us-gaap:SegmentContinuingOperationsMember 2017-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateCommercialMortgageMember us-gaap:SegmentContinuingOperationsMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerDirectLoansMember us-gaap:SegmentContinuingOperationsMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerIndirectLoansMember us-gaap:SegmentContinuingOperationsMember 2018-01-01 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerCreditCardMember us-gaap:SegmentContinuingOperationsMember 2017-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialFinancialAndAgriculturalMember us-gaap:SegmentContinuingOperationsMember 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:HomeEquityLoanMember us-gaap:SegmentContinuingOperationsMember 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialFinancialAndAgriculturalMember us-gaap:SegmentContinuingOperationsMember 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:SegmentContinuingOperationsMember 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:SegmentContinuingOperationsMember 2017-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:ConstructionLoansMember us-gaap:SegmentContinuingOperationsMember 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:RealEstateResidentialMortgageMember us-gaap:SegmentContinuingOperationsMember 2017-12-31 0000091576 us-gaap:SegmentDiscontinuedOperationsMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerCreditCardMember us-gaap:SegmentContinuingOperationsMember 2018-01-01 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:HomeEquityLoanMember us-gaap:SegmentContinuingOperationsMember 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:ConsumerPortfolioSegmentMember us-gaap:SegmentContinuingOperationsMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerIndirectLoansMember us-gaap:SegmentContinuingOperationsMember 2017-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialLeaseFinancingMember us-gaap:SegmentContinuingOperationsMember 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:CommercialRealEstateMember us-gaap:SegmentContinuingOperationsMember 2017-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:CommercialRealEstateMember us-gaap:SegmentContinuingOperationsMember 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateLoansMember 2017-04-01 2017-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateCommercialMortgageMember 2017-01-01 2017-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerIndirectLoansMember 2018-01-01 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember 2017-01-01 2017-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerCreditCardMember 2018-04-01 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:RealEstateResidentialMortgageMember 2018-01-01 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerDirectLoansMember 2017-01-01 2017-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember 2017-01-01 2017-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerDirectLoansMember 2018-04-01 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:RealEstateResidentialMortgageMember 2018-04-01 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember 2018-01-01 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateConstructionMember 2018-01-01 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateConstructionMember 2017-04-01 2017-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateConstructionMember 2018-04-01 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:RealEstateResidentialMortgageMember 2017-01-01 2017-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerIndirectLoansMember 2018-04-01 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateLoansMember 2018-01-01 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember 2018-04-01 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:HomeEquityLoanMember 2017-04-01 2017-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember 2017-04-01 2017-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerIndirectLoansMember 2017-04-01 2017-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerDirectLoansMember 2017-04-01 2017-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember 2018-04-01 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember 2018-01-01 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateLoansMember 2018-04-01 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:HomeEquityLoanMember 2017-01-01 2017-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateCommercialMortgageMember 2018-04-01 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerCreditCardMember 2017-04-01 2017-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialFinancialAndAgriculturalMember 2017-01-01 2017-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateLoansMember 2017-01-01 2017-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerIndirectLoansMember 2017-01-01 2017-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:HomeEquityLoanMember 2018-04-01 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialFinancialAndAgriculturalMember 2018-01-01 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerCreditCardMember 2017-01-01 2017-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:HomeEquityLoanMember 2018-01-01 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerCreditCardMember 2018-01-01 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateCommercialMortgageMember 2017-04-01 2017-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialFinancialAndAgriculturalMember 2017-04-01 2017-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerDirectLoansMember 2018-01-01 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialFinancialAndAgriculturalMember 2018-04-01 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateCommercialMortgageMember 2018-01-01 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember 2017-04-01 2017-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:RealEstateResidentialMortgageMember 2017-04-01 2017-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateConstructionMember 2017-01-01 2017-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:CreditCardReceivablesMember us-gaap:SegmentContinuingOperationsMember 2017-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateLoansMember us-gaap:SegmentContinuingOperationsMember 2017-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateConstructionMember us-gaap:SegmentContinuingOperationsMember 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:SegmentContinuingOperationsMember 2017-12-31 0000091576 key:PurchaseCreditImpairedLoansMember 2017-01-01 2017-12-31 0000091576 key:PurchaseCreditImpairedLoansMember 2017-12-31 0000091576 key:PurchaseCreditImpairedLoansMember 2016-12-31 0000091576 key:CommercialPortfolioSegmentPCIMember key:CommercialFinancialAndAgriculturalMember us-gaap:PassMember 2018-06-30 0000091576 key:CommercialPortfolioSegmentPCIMember key:CommercialLeasesMember us-gaap:PassMember 2017-12-31 0000091576 key:CommercialPortfolioSegmentPCIMember key:CommercialRealEstateLoansMember 2018-06-30 0000091576 key:CommercialPortfolioSegmentPCIMember key:CommercialLeasesMember us-gaap:PassMember 2018-06-30 0000091576 key:CommercialPortfolioSegmentPCIMember key:CommercialRealEstateLoansMember key:CriticizedAccruingMember 2017-12-31 0000091576 key:CommercialPortfolioSegmentPCIMember key:CommercialRealEstateLoansMember key:CriticizedAccruingMember 2018-06-30 0000091576 key:CommercialPortfolioSegmentPCIMember key:CriticizedAccruingMember 2017-12-31 0000091576 key:CommercialPortfolioSegmentPCIMember key:CommercialFinancialAndAgriculturalMember 2018-06-30 0000091576 key:CommercialPortfolioSegmentPCIMember key:CommercialFinancialAndAgriculturalMember 2017-12-31 0000091576 key:CommercialPortfolioSegmentPCIMember us-gaap:PassMember 2017-12-31 0000091576 key:CommercialPortfolioSegmentPCIMember us-gaap:ConstructionLoansMember key:CriticizedAccruingMember 2018-06-30 0000091576 key:CommercialPortfolioSegmentPCIMember key:CommercialRealEstateLoansMember us-gaap:PassMember 2017-12-31 0000091576 key:CommercialPortfolioSegmentPCIMember us-gaap:ConstructionLoansMember key:CriticizedAccruingMember 2017-12-31 0000091576 key:CommercialPortfolioSegmentPCIMember key:CommercialFinancialAndAgriculturalMember us-gaap:PassMember 2017-12-31 0000091576 key:CommercialPortfolioSegmentPCIMember key:CommercialFinancialAndAgriculturalMember key:CriticizedAccruingMember 2018-06-30 0000091576 key:CommercialPortfolioSegmentPCIMember key:CommercialRealEstateLoansMember 2017-12-31 0000091576 key:CommercialPortfolioSegmentPCIMember key:CommercialRealEstateLoansMember us-gaap:PassMember 2018-06-30 0000091576 key:CommercialPortfolioSegmentPCIMember us-gaap:ConstructionLoansMember 2017-12-31 0000091576 key:CommercialPortfolioSegmentPCIMember 2018-06-30 0000091576 key:CommercialPortfolioSegmentPCIMember key:CommercialLeasesMember key:CriticizedAccruingMember 2018-06-30 0000091576 key:CommercialPortfolioSegmentPCIMember key:CommercialLeasesMember 2018-06-30 0000091576 key:CommercialPortfolioSegmentPCIMember key:CriticizedAccruingMember 2018-06-30 0000091576 key:CommercialPortfolioSegmentPCIMember key:CommercialLeasesMember key:CriticizedAccruingMember 2017-12-31 0000091576 key:CommercialPortfolioSegmentPCIMember us-gaap:ConstructionLoansMember 2018-06-30 0000091576 key:CommercialPortfolioSegmentPCIMember key:CommercialLeasesMember 2017-12-31 0000091576 key:CommercialPortfolioSegmentPCIMember 2017-12-31 0000091576 key:CommercialPortfolioSegmentPCIMember us-gaap:ConstructionLoansMember us-gaap:PassMember 2017-12-31 0000091576 key:CommercialPortfolioSegmentPCIMember us-gaap:ConstructionLoansMember us-gaap:PassMember 2018-06-30 0000091576 key:CommercialPortfolioSegmentPCIMember key:CommercialFinancialAndAgriculturalMember key:CriticizedAccruingMember 2017-12-31 0000091576 key:CommercialPortfolioSegmentPCIMember us-gaap:PassMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:SegmentContinuingOperationsMember 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateConstructionMember us-gaap:SegmentContinuingOperationsMember 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateLoansMember us-gaap:SegmentContinuingOperationsMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:CreditCardReceivablesMember us-gaap:SegmentContinuingOperationsMember 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:CommercialPortfolioSegmentMember us-gaap:SegmentContinuingOperationsMember 2018-06-30 0000091576 key:FICOScoreNoScoreMember key:ConsumerPortfolioSegmentExcludingPCIMember key:ConsumerIndirectLoansMember 2017-12-31 0000091576 key:FICOScoreLessthan660Member key:ConsumerPortfolioSegmentExcludingPCIMember 2018-06-30 0000091576 key:ConsumerPortfolioSegmentExcludingPCIMember 2018-06-30 0000091576 key:ConsumerPortfolioSegmentExcludingPCIMember key:ConsumerCreditCardMember 2017-12-31 0000091576 key:FICOScore660to749Member key:ConsumerPortfolioSegmentExcludingPCIMember key:ConsumerIndirectLoansMember 2017-12-31 0000091576 key:FICOScoreNoScoreMember key:ConsumerPortfolioSegmentExcludingPCIMember key:ConsumerDirectLoansMember 2018-06-30 0000091576 key:FICOScore660to749Member key:ConsumerPortfolioSegmentExcludingPCIMember key:ConsumerDirectLoansMember 2017-12-31 0000091576 key:ConsumerPortfolioSegmentExcludingPCIMember key:ConsumerIndirectLoansMember 2018-06-30 0000091576 key:FICOScoreLessthan660Member key:ConsumerPortfolioSegmentExcludingPCIMember key:ConsumerIndirectLoansMember 2018-06-30 0000091576 key:ConsumerPortfolioSegmentExcludingPCIMember key:ResidentialPrimeFinancingReceivablesMember 2018-06-30 0000091576 key:FICOScoreLessthan660Member key:ConsumerPortfolioSegmentExcludingPCIMember key:ConsumerIndirectLoansMember 2017-12-31 0000091576 key:FICOScore750andAboveMember key:ConsumerPortfolioSegmentExcludingPCIMember key:ConsumerIndirectLoansMember 2018-06-30 0000091576 key:FICOScoreLessthan660Member key:ConsumerPortfolioSegmentExcludingPCIMember key:ConsumerDirectLoansMember 2017-12-31 0000091576 key:FICOScore660to749Member key:ConsumerPortfolioSegmentExcludingPCIMember key:ConsumerCreditCardMember 2018-06-30 0000091576 key:ConsumerPortfolioSegmentExcludingPCIMember key:ConsumerCreditCardMember 2018-06-30 0000091576 key:FICOScore660to749Member key:ConsumerPortfolioSegmentExcludingPCIMember key:ConsumerIndirectLoansMember 2018-06-30 0000091576 key:FICOScoreLessthan660Member key:ConsumerPortfolioSegmentExcludingPCIMember key:ResidentialPrimeFinancingReceivablesMember 2017-12-31 0000091576 key:FICOScore660to749Member key:ConsumerPortfolioSegmentExcludingPCIMember key:ConsumerDirectLoansMember 2018-06-30 0000091576 key:FICOScore750andAboveMember key:ConsumerPortfolioSegmentExcludingPCIMember key:ConsumerDirectLoansMember 2017-12-31 0000091576 key:FICOScoreNoScoreMember key:ConsumerPortfolioSegmentExcludingPCIMember 2018-06-30 0000091576 key:FICOScoreLessthan660Member key:ConsumerPortfolioSegmentExcludingPCIMember key:ConsumerDirectLoansMember 2018-06-30 0000091576 key:ConsumerPortfolioSegmentExcludingPCIMember key:ConsumerIndirectLoansMember 2017-12-31 0000091576 key:FICOScore660to749Member key:ConsumerPortfolioSegmentExcludingPCIMember key:ResidentialPrimeFinancingReceivablesMember 2018-06-30 0000091576 key:FICOScoreNoScoreMember key:ConsumerPortfolioSegmentExcludingPCIMember key:ConsumerCreditCardMember 2017-12-31 0000091576 key:FICOScore750andAboveMember key:ConsumerPortfolioSegmentExcludingPCIMember 2018-06-30 0000091576 key:ConsumerPortfolioSegmentExcludingPCIMember key:ConsumerDirectLoansMember 2018-06-30 0000091576 key:FICOScoreNoScoreMember key:ConsumerPortfolioSegmentExcludingPCIMember key:ConsumerCreditCardMember 2018-06-30 0000091576 key:FICOScoreNoScoreMember key:ConsumerPortfolioSegmentExcludingPCIMember 2017-12-31 0000091576 key:FICOScoreNoScoreMember key:ConsumerPortfolioSegmentExcludingPCIMember key:ConsumerIndirectLoansMember 2018-06-30 0000091576 key:FICOScoreLessthan660Member key:ConsumerPortfolioSegmentExcludingPCIMember key:ConsumerCreditCardMember 2018-06-30 0000091576 key:FICOScore750andAboveMember key:ConsumerPortfolioSegmentExcludingPCIMember key:ConsumerCreditCardMember 2017-12-31 0000091576 key:FICOScore660to749Member key:ConsumerPortfolioSegmentExcludingPCIMember 2017-12-31 0000091576 key:FICOScoreLessthan660Member key:ConsumerPortfolioSegmentExcludingPCIMember 2017-12-31 0000091576 key:FICOScoreNoScoreMember key:ConsumerPortfolioSegmentExcludingPCIMember key:ConsumerDirectLoansMember 2017-12-31 0000091576 key:FICOScore750andAboveMember key:ConsumerPortfolioSegmentExcludingPCIMember key:ConsumerDirectLoansMember 2018-06-30 0000091576 key:ConsumerPortfolioSegmentExcludingPCIMember 2017-12-31 0000091576 key:ConsumerPortfolioSegmentExcludingPCIMember key:ResidentialPrimeFinancingReceivablesMember 2017-12-31 0000091576 key:ConsumerPortfolioSegmentExcludingPCIMember key:ConsumerDirectLoansMember 2017-12-31 0000091576 key:FICOScore750andAboveMember key:ConsumerPortfolioSegmentExcludingPCIMember key:ResidentialPrimeFinancingReceivablesMember 2018-06-30 0000091576 key:FICOScore750andAboveMember key:ConsumerPortfolioSegmentExcludingPCIMember key:ConsumerIndirectLoansMember 2017-12-31 0000091576 key:FICOScore660to749Member key:ConsumerPortfolioSegmentExcludingPCIMember 2018-06-30 0000091576 key:FICOScore660to749Member key:ConsumerPortfolioSegmentExcludingPCIMember key:ResidentialPrimeFinancingReceivablesMember 2017-12-31 0000091576 key:FICOScoreNoScoreMember key:ConsumerPortfolioSegmentExcludingPCIMember key:ResidentialPrimeFinancingReceivablesMember 2017-12-31 0000091576 key:FICOScore750andAboveMember key:ConsumerPortfolioSegmentExcludingPCIMember 2017-12-31 0000091576 key:FICOScoreLessthan660Member key:ConsumerPortfolioSegmentExcludingPCIMember key:ResidentialPrimeFinancingReceivablesMember 2018-06-30 0000091576 key:FICOScoreLessthan660Member key:ConsumerPortfolioSegmentExcludingPCIMember key:ConsumerCreditCardMember 2017-12-31 0000091576 key:FICOScore750andAboveMember key:ConsumerPortfolioSegmentExcludingPCIMember key:ResidentialPrimeFinancingReceivablesMember 2017-12-31 0000091576 key:FICOScore660to749Member key:ConsumerPortfolioSegmentExcludingPCIMember key:ConsumerCreditCardMember 2017-12-31 0000091576 key:FICOScore750andAboveMember key:ConsumerPortfolioSegmentExcludingPCIMember key:ConsumerCreditCardMember 2018-06-30 0000091576 key:FICOScoreNoScoreMember key:ConsumerPortfolioSegmentExcludingPCIMember key:ResidentialPrimeFinancingReceivablesMember 2018-06-30 0000091576 2017-01-01 2017-12-31 0000091576 us-gaap:NonperformingFinancingReceivableMember us-gaap:CommercialPortfolioSegmentMember us-gaap:NonperformingFinancingReceivableMember 2018-01-01 2018-06-30 0000091576 us-gaap:CommercialRealEstatePortfolioSegmentMember key:CommercialFinancialAndAgriculturalMember key:PriorYearAccruingMember 2018-01-01 2018-06-30 0000091576 us-gaap:NonperformingFinancingReceivableMember us-gaap:ConsumerPortfolioSegmentMember key:ConsumerCreditCardMember us-gaap:NonperformingFinancingReceivableMember 2018-01-01 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerDirectLoansMember key:PriorYearAccruingMember 2017-01-01 2017-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialFinancialAndAgriculturalMember key:PriorYearAccruingMember 2017-01-01 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerCreditCardMember key:PriorYearAccruingMember 2017-01-01 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerCreditCardMember key:PriorYearAccruingMember 2018-01-01 2018-06-30 0000091576 us-gaap:NonperformingFinancingReceivableMember us-gaap:CommercialPortfolioSegmentMember key:CommercialFinancialAndAgriculturalMember us-gaap:NonperformingFinancingReceivableMember 2018-01-01 2018-06-30 0000091576 us-gaap:NonperformingFinancingReceivableMember us-gaap:ConsumerPortfolioSegmentMember key:ConsumerIndirectLoansMember 2017-01-01 2017-12-31 0000091576 us-gaap:NonperformingFinancingReceivableMember us-gaap:ConsumerPortfolioSegmentMember key:ConsumerIndirectLoansMember 2018-01-01 2018-06-30 0000091576 us-gaap:NonperformingFinancingReceivableMember us-gaap:ConsumerPortfolioSegmentMember key:ConsumerDirectLoansMember us-gaap:NonperformingFinancingReceivableMember 2018-01-01 2018-06-30 0000091576 us-gaap:NonperformingFinancingReceivableMember us-gaap:NonperformingFinancingReceivableMember 2018-01-01 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:PriorYearAccruingMember 2018-01-01 2018-06-30 0000091576 us-gaap:NonperformingFinancingReceivableMember us-gaap:ConsumerPortfolioSegmentMember key:ConsumerDirectLoansMember us-gaap:NonperformingFinancingReceivableMember 2017-01-01 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerDirectLoansMember key:PriorYearAccruingMember 2018-01-01 2018-06-30 0000091576 us-gaap:NonperformingFinancingReceivableMember us-gaap:ConsumerPortfolioSegmentMember us-gaap:HomeEquityLoanMember 2017-01-01 2017-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember key:PriorYearAccruingMember 2017-01-01 2017-12-31 0000091576 us-gaap:CommercialRealEstatePortfolioSegmentMember key:PriorYearAccruingMember 2018-01-01 2018-06-30 0000091576 us-gaap:NonperformingFinancingReceivableMember us-gaap:ConsumerPortfolioSegmentMember us-gaap:NonperformingFinancingReceivableMember 2018-01-01 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerIndirectLoansMember key:PriorYearAccruingMember 2017-01-01 2017-12-31 0000091576 us-gaap:NonperformingFinancingReceivableMember us-gaap:ConsumerPortfolioSegmentMember us-gaap:HomeEquityLoanMember 2018-01-01 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:HomeEquityLoanMember key:PriorYearAccruingMember 2018-01-01 2018-06-30 0000091576 us-gaap:NonperformingFinancingReceivableMember us-gaap:CommercialRealEstatePortfolioSegmentMember key:CommercialRealEstateLoansMember us-gaap:NonperformingFinancingReceivableMember 2017-01-01 2017-12-31 0000091576 us-gaap:NonperformingFinancingReceivableMember us-gaap:ConsumerPortfolioSegmentMember key:RealEstateResidentialMortgageMember us-gaap:NonperformingFinancingReceivableMember 2017-01-01 2017-12-31 0000091576 us-gaap:NonperformingFinancingReceivableMember us-gaap:CommercialPortfolioSegmentMember key:CommercialFinancialAndAgriculturalMember us-gaap:NonperformingFinancingReceivableMember 2017-01-01 2017-12-31 0000091576 key:PriorYearAccruingMember 2018-01-01 2018-06-30 0000091576 us-gaap:CommercialRealEstatePortfolioSegmentMember key:PriorYearAccruingMember 2017-01-01 2017-12-31 0000091576 key:PriorYearAccruingMember 2017-01-01 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:RealEstateResidentialMortgageMember key:PriorYearAccruingMember 2018-01-01 2018-06-30 0000091576 us-gaap:CommercialRealEstatePortfolioSegmentMember key:CommercialFinancialAndAgriculturalMember key:PriorYearAccruingMember 2017-01-01 2017-12-31 0000091576 us-gaap:NonperformingFinancingReceivableMember us-gaap:ConsumerPortfolioSegmentMember key:RealEstateResidentialMortgageMember us-gaap:NonperformingFinancingReceivableMember 2018-01-01 2018-06-30 0000091576 us-gaap:NonperformingFinancingReceivableMember us-gaap:CommercialRealEstatePortfolioSegmentMember key:CommercialRealEstateCommercialMortgageMember us-gaap:NonperformingFinancingReceivableMember 2018-01-01 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:PriorYearAccruingMember 2017-01-01 2017-12-31 0000091576 us-gaap:NonperformingFinancingReceivableMember us-gaap:NonperformingFinancingReceivableMember 2017-01-01 2017-12-31 0000091576 us-gaap:NonperformingFinancingReceivableMember us-gaap:CommercialRealEstatePortfolioSegmentMember key:CommercialRealEstateCommercialMortgageMember us-gaap:NonperformingFinancingReceivableMember 2017-01-01 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:PriorYearAccruingMember 2018-01-01 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialFinancialAndAgriculturalMember key:PriorYearAccruingMember 2018-01-01 2018-06-30 0000091576 us-gaap:NonperformingFinancingReceivableMember us-gaap:CommercialPortfolioSegmentMember us-gaap:NonperformingFinancingReceivableMember 2017-01-01 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerIndirectLoansMember key:PriorYearAccruingMember 2018-01-01 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:RealEstateResidentialMortgageMember key:PriorYearAccruingMember 2017-01-01 2017-12-31 0000091576 us-gaap:NonperformingFinancingReceivableMember us-gaap:ConsumerPortfolioSegmentMember us-gaap:NonperformingFinancingReceivableMember 2017-01-01 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:HomeEquityLoanMember key:PriorYearAccruingMember 2017-01-01 2017-12-31 0000091576 us-gaap:NonperformingFinancingReceivableMember us-gaap:ConsumerPortfolioSegmentMember key:ConsumerCreditCardMember us-gaap:NonperformingFinancingReceivableMember 2017-01-01 2017-12-31 0000091576 us-gaap:NonperformingFinancingReceivableMember us-gaap:CommercialRealEstatePortfolioSegmentMember key:CommercialRealEstateLoansMember us-gaap:NonperformingFinancingReceivableMember 2018-01-01 2018-06-30 0000091576 key:PurchaseCreditImpairedLoansMember 2018-04-01 2018-06-30 0000091576 key:PurchaseCreditImpairedLoansMember 2018-06-30 0000091576 key:PurchaseCreditImpairedLoansMember 2018-01-01 2018-06-30 0000091576 key:PurchaseCreditImpairedLoansMember 2018-03-31 0000091576 key:PurchaseCreditImpairedLoansMember us-gaap:SegmentContinuingOperationsMember 2017-01-01 2017-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember 2018-04-01 2018-06-30 0000091576 key:RealEstateResidentialMortgageMember 2017-01-01 2017-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember 2017-01-01 2017-06-30 0000091576 key:PurchaseCreditImpairedLoansMember us-gaap:SegmentContinuingOperationsMember 2018-01-01 2018-06-30 0000091576 key:ForeclosedResidentialRealEstateMember 2017-12-31 0000091576 key:PurchaseCreditImpairedLoansMember us-gaap:SegmentContinuingOperationsMember 2017-01-01 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember 2018-01-01 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember 2018-04-01 2018-06-30 0000091576 key:ForeclosedResidentialRealEstateMember 2018-06-30 0000091576 key:RealEstateResidentialMortgageMember 2018-01-01 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember 2017-04-01 2017-06-30 0000091576 us-gaap:SegmentDiscontinuedOperationsMember 2018-03-31 0000091576 us-gaap:SegmentDiscontinuedOperationsMember 2018-04-01 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialFinancialAndAgriculturalMember us-gaap:SegmentContinuingOperationsMember 2018-04-01 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:HomeEquityLoanMember us-gaap:SegmentContinuingOperationsMember 2018-04-01 2018-06-30 0000091576 us-gaap:SegmentContinuingOperationsMember 2018-04-01 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:RealEstateResidentialMortgageMember us-gaap:SegmentContinuingOperationsMember 2018-03-31 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:ConstructionLoansMember us-gaap:SegmentContinuingOperationsMember 2018-03-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerIndirectLoansMember us-gaap:SegmentContinuingOperationsMember 2018-04-01 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:ConstructionLoansMember us-gaap:SegmentContinuingOperationsMember 2018-04-01 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerDirectLoansMember us-gaap:SegmentContinuingOperationsMember 2018-04-01 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialFinancialAndAgriculturalMember us-gaap:SegmentContinuingOperationsMember 2018-03-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:RealEstateResidentialMortgageMember us-gaap:SegmentContinuingOperationsMember 2018-04-01 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:ConsumerPortfolioSegmentMember us-gaap:SegmentContinuingOperationsMember 2018-04-01 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateCommercialMortgageMember us-gaap:SegmentContinuingOperationsMember 2018-04-01 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialLeaseFinancingMember us-gaap:SegmentContinuingOperationsMember 2018-04-01 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:CommercialRealEstateMember us-gaap:SegmentContinuingOperationsMember 2018-04-01 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:HomeEquityLoanMember us-gaap:SegmentContinuingOperationsMember 2018-03-31 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:SegmentContinuingOperationsMember 2018-04-01 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerCreditCardMember us-gaap:SegmentContinuingOperationsMember 2018-04-01 2018-06-30 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialLeaseFinancingMember us-gaap:SegmentContinuingOperationsMember 2018-03-31 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateCommercialMortgageMember us-gaap:SegmentContinuingOperationsMember 2018-03-31 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:CommercialRealEstateMember us-gaap:SegmentContinuingOperationsMember 2018-03-31 0000091576 us-gaap:SegmentContinuingOperationsMember 2018-03-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerIndirectLoansMember us-gaap:SegmentContinuingOperationsMember 2018-03-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerCreditCardMember us-gaap:SegmentContinuingOperationsMember 2018-03-31 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:SegmentContinuingOperationsMember 2018-03-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerDirectLoansMember us-gaap:SegmentContinuingOperationsMember 2018-03-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:ConsumerPortfolioSegmentMember us-gaap:SegmentContinuingOperationsMember 2018-03-31 0000091576 key:ConsumerPortfolioSegmentPCIMember 2017-12-31 0000091576 key:FICOScore750andAboveMember key:ConsumerPortfolioSegmentPCIMember key:ConsumerDirectLoansMember 2018-06-30 0000091576 key:FICOScore660to749Member key:ConsumerPortfolioSegmentPCIMember key:ConsumerIndirectLoansMember 2018-06-30 0000091576 key:ConsumerPortfolioSegmentPCIMember key:ResidentialPrimeFinancingReceivablesMember 2017-12-31 0000091576 key:FICOScoreNoScoreMember key:ConsumerPortfolioSegmentPCIMember key:ConsumerDirectLoansMember 2018-06-30 0000091576 key:FICOScoreNoScoreMember key:ConsumerPortfolioSegmentPCIMember key:ConsumerCreditCardMember 2017-12-31 0000091576 key:FICOScore660to749Member key:ConsumerPortfolioSegmentPCIMember key:ConsumerDirectLoansMember 2018-06-30 0000091576 key:FICOScoreNoScoreMember key:ConsumerPortfolioSegmentPCIMember key:ResidentialPrimeFinancingReceivablesMember 2018-06-30 0000091576 key:FICOScore750andAboveMember key:ConsumerPortfolioSegmentPCIMember 2017-12-31 0000091576 key:FICOScoreNoScoreMember key:ConsumerPortfolioSegmentPCIMember key:ConsumerCreditCardMember 2018-06-30 0000091576 key:FICOScore750andAboveMember key:ConsumerPortfolioSegmentPCIMember key:ConsumerIndirectLoansMember 2017-12-31 0000091576 key:FICOScoreNoScoreMember key:ConsumerPortfolioSegmentPCIMember key:ConsumerIndirectLoansMember 2018-06-30 0000091576 key:FICOScoreLessthan660Member key:ConsumerPortfolioSegmentPCIMember key:ConsumerDirectLoansMember 2018-06-30 0000091576 key:ConsumerPortfolioSegmentPCIMember key:ConsumerDirectLoansMember 2018-06-30 0000091576 key:ConsumerPortfolioSegmentPCIMember 2018-06-30 0000091576 key:FICOScore750andAboveMember key:ConsumerPortfolioSegmentPCIMember key:ConsumerDirectLoansMember 2017-12-31 0000091576 key:FICOScore660to749Member key:ConsumerPortfolioSegmentPCIMember key:ConsumerDirectLoansMember 2017-12-31 0000091576 key:FICOScore660to749Member key:ConsumerPortfolioSegmentPCIMember key:ResidentialPrimeFinancingReceivablesMember 2017-12-31 0000091576 key:FICOScoreLessthan660Member key:ConsumerPortfolioSegmentPCIMember key:ConsumerCreditCardMember 2017-12-31 0000091576 key:FICOScore660to749Member key:ConsumerPortfolioSegmentPCIMember key:ConsumerCreditCardMember 2017-12-31 0000091576 key:FICOScoreLessthan660Member key:ConsumerPortfolioSegmentPCIMember key:ConsumerCreditCardMember 2018-06-30 0000091576 key:FICOScoreNoScoreMember key:ConsumerPortfolioSegmentPCIMember 2018-06-30 0000091576 key:ConsumerPortfolioSegmentPCIMember key:ConsumerCreditCardMember 2017-12-31 0000091576 key:ConsumerPortfolioSegmentPCIMember key:ResidentialPrimeFinancingReceivablesMember 2018-06-30 0000091576 key:FICOScoreNoScoreMember key:ConsumerPortfolioSegmentPCIMember key:ConsumerDirectLoansMember 2017-12-31 0000091576 key:FICOScoreLessthan660Member key:ConsumerPortfolioSegmentPCIMember key:ResidentialPrimeFinancingReceivablesMember 2017-12-31 0000091576 key:FICOScore750andAboveMember key:ConsumerPortfolioSegmentPCIMember 2018-06-30 0000091576 key:FICOScore660to749Member key:ConsumerPortfolioSegmentPCIMember key:ResidentialPrimeFinancingReceivablesMember 2018-06-30 0000091576 key:FICOScoreLessthan660Member key:ConsumerPortfolioSegmentPCIMember 2017-12-31 0000091576 key:FICOScoreLessthan660Member key:ConsumerPortfolioSegmentPCIMember key:ConsumerDirectLoansMember 2017-12-31 0000091576 key:FICOScoreLessthan660Member key:ConsumerPortfolioSegmentPCIMember key:ResidentialPrimeFinancingReceivablesMember 2018-06-30 0000091576 key:FICOScore750andAboveMember key:ConsumerPortfolioSegmentPCIMember key:ConsumerCreditCardMember 2018-06-30 0000091576 key:FICOScore660to749Member key:ConsumerPortfolioSegmentPCIMember key:ConsumerIndirectLoansMember 2017-12-31 0000091576 key:FICOScoreNoScoreMember key:ConsumerPortfolioSegmentPCIMember 2017-12-31 0000091576 key:FICOScore750andAboveMember key:ConsumerPortfolioSegmentPCIMember key:ResidentialPrimeFinancingReceivablesMember 2017-12-31 0000091576 key:FICOScore660to749Member key:ConsumerPortfolioSegmentPCIMember key:ConsumerCreditCardMember 2018-06-30 0000091576 key:FICOScore660to749Member key:ConsumerPortfolioSegmentPCIMember 2017-12-31 0000091576 key:FICOScoreNoScoreMember key:ConsumerPortfolioSegmentPCIMember key:ResidentialPrimeFinancingReceivablesMember 2017-12-31 0000091576 key:ConsumerPortfolioSegmentPCIMember key:ConsumerIndirectLoansMember 2018-06-30 0000091576 key:FICOScoreLessthan660Member key:ConsumerPortfolioSegmentPCIMember 2018-06-30 0000091576 key:FICOScore750andAboveMember key:ConsumerPortfolioSegmentPCIMember key:ConsumerCreditCardMember 2017-12-31 0000091576 key:FICOScoreNoScoreMember key:ConsumerPortfolioSegmentPCIMember key:ConsumerIndirectLoansMember 2017-12-31 0000091576 key:FICOScore750andAboveMember key:ConsumerPortfolioSegmentPCIMember key:ResidentialPrimeFinancingReceivablesMember 2018-06-30 0000091576 key:ConsumerPortfolioSegmentPCIMember key:ConsumerIndirectLoansMember 2017-12-31 0000091576 key:FICOScoreLessthan660Member key:ConsumerPortfolioSegmentPCIMember key:ConsumerIndirectLoansMember 2017-12-31 0000091576 key:ConsumerPortfolioSegmentPCIMember key:ConsumerDirectLoansMember 2017-12-31 0000091576 key:FICOScoreLessthan660Member key:ConsumerPortfolioSegmentPCIMember key:ConsumerIndirectLoansMember 2018-06-30 0000091576 key:FICOScore660to749Member key:ConsumerPortfolioSegmentPCIMember 2018-06-30 0000091576 key:FICOScore750andAboveMember key:ConsumerPortfolioSegmentPCIMember key:ConsumerIndirectLoansMember 2018-06-30 0000091576 key:ConsumerPortfolioSegmentPCIMember key:ConsumerCreditCardMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:HomeEquityLoanMember us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember 2017-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateLoansMember us-gaap:FinancingReceivables60To89DaysPastDueMember 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerDirectLoansMember us-gaap:FinancingReceivables30To59DaysPastDueMember 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:RealEstateResidentialMortgageMember us-gaap:FinancingReceivables60To89DaysPastDueMember 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:HomeEquityLoanMember us-gaap:FinancingReceivables60To89DaysPastDueMember 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:RealEstateResidentialMortgageMember 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:FinancingReceivables60To89DaysPastDueMember 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerIndirectLoansMember 2017-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialLeaseFinancingMember us-gaap:FinancingReceivables30To59DaysPastDueMember 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerDirectLoansMember us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember 2017-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialFinancialAndAgriculturalMember 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:CreditCardReceivablesMember us-gaap:FinancingReceivables60To89DaysPastDueMember 2017-12-31 0000091576 us-gaap:FinancingReceivables60To89DaysPastDueMember 2017-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateLoansMember 2017-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateCommercialMortgageMember us-gaap:FinancingReceivables60To89DaysPastDueMember 2017-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateLoansMember us-gaap:FinancingReceivables30To59DaysPastDueMember 2017-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateCommercialMortgageMember 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerIndirectLoansMember us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember 2017-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:FinancingReceivables30To59DaysPastDueMember 2017-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember 2017-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialLeaseFinancingMember 2017-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateConstructionMember us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember 2017-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember us-gaap:FinancingReceivables60To89DaysPastDueMember 2017-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialLeaseFinancingMember us-gaap:FinancingReceivables60To89DaysPastDueMember 2017-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialFinancialAndAgriculturalMember us-gaap:FinancingReceivables30To59DaysPastDueMember 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:CreditCardReceivablesMember 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerDirectLoansMember 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:HomeEquityLoanMember 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:CreditCardReceivablesMember us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:CreditCardReceivablesMember us-gaap:FinancingReceivables30To59DaysPastDueMember 2017-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateCommercialMortgageMember us-gaap:FinancingReceivables30To59DaysPastDueMember 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerDirectLoansMember us-gaap:FinancingReceivables60To89DaysPastDueMember 2017-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateConstructionMember 2017-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialLeaseFinancingMember us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember 2017-12-31 0000091576 us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:RealEstateResidentialMortgageMember us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember 2017-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateCommercialMortgageMember us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember 2017-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialFinancialAndAgriculturalMember us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember 2017-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateLoansMember us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:FinancingReceivables30To59DaysPastDueMember 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:RealEstateResidentialMortgageMember us-gaap:FinancingReceivables30To59DaysPastDueMember 2017-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateConstructionMember us-gaap:FinancingReceivables60To89DaysPastDueMember 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember 2017-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialFinancialAndAgriculturalMember us-gaap:FinancingReceivables60To89DaysPastDueMember 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerIndirectLoansMember us-gaap:FinancingReceivables60To89DaysPastDueMember 2017-12-31 0000091576 us-gaap:CommercialPortfolioSegmentMember key:CommercialRealEstateConstructionMember us-gaap:FinancingReceivables30To59DaysPastDueMember 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember us-gaap:HomeEquityLoanMember us-gaap:FinancingReceivables30To59DaysPastDueMember 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerIndirectLoansMember us-gaap:FinancingReceivables30To59DaysPastDueMember 2017-12-31 0000091576 us-gaap:FinancingReceivables30To59DaysPastDueMember 2017-12-31 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerCreditCardMember 2018-06-30 0000091576 us-gaap:ConsumerPortfolioSegmentMember key:ConsumerCreditCardMember 2017-12-31 0000091576 us-gaap:CreditRiskContractMember 2018-04-01 2018-06-30 0000091576 us-gaap:OtherCreditDerivativesMember 2018-04-01 2018-06-30 0000091576 us-gaap:OtherCreditDerivativesMember 2018-01-01 2018-06-30 0000091576 key:LoansHeldForSaleFairValueMember 2018-04-01 2018-06-30 0000091576 us-gaap:CreditRiskContractMember 2018-06-30 0000091576 us-gaap:OtherDebtSecuritiesMember us-gaap:AvailableforsaleSecuritiesMember 2018-01-01 2018-06-30 0000091576 us-gaap:OtherInvestmentsMember key:PrincipalDirectInvestmentsMember 2018-03-31 0000091576 us-gaap:OtherInvestmentsMember 2018-04-01 2018-06-30 0000091576 key:LoansHeldForInvestmentFairValueMember 2018-04-01 2018-06-30 0000091576 us-gaap:OtherInvestmentsMember key:PrincipalDirectInvestmentsMember 2018-01-01 2018-06-30 0000091576 us-gaap:OtherInvestmentsMember key:PrincipalDirectInvestmentsMember 2018-04-01 2018-06-30 0000091576 us-gaap:InterestRateContractMember 2018-01-01 2018-06-30 0000091576 us-gaap:InterestRateContractMember 2018-04-01 2018-06-30 0000091576 us-gaap:OtherDebtSecuritiesMember us-gaap:AvailableforsaleSecuritiesMember 2018-04-01 2018-06-30 0000091576 us-gaap:OtherInvestmentsMember 2018-01-01 2018-06-30 0000091576 us-gaap:CreditRiskContractMember 2018-01-01 2018-06-30 0000091576 key:LoansHeldForSaleFairValueMember 2018-01-01 2018-06-30 0000091576 us-gaap:OtherDebtSecuritiesMember us-gaap:AvailableforsaleSecuritiesMember 2018-06-30 0000091576 key:LoansHeldForInvestmentFairValueMember 2018-06-30 0000091576 key:LoansHeldForInvestmentFairValueMember 2018-01-01 2018-06-30 0000091576 key:LoansHeldForInvestmentFairValueMember 2017-12-31 0000091576 us-gaap:OtherInvestmentsMember key:PrincipalDirectInvestmentsMember 2018-06-30 0000091576 us-gaap:OtherCreditDerivativesMember 2018-03-31 0000091576 key:LoansHeldForSaleFairValueMember 2018-06-30 0000091576 us-gaap:InterestRateContractMember 2018-06-30 0000091576 us-gaap:OtherCreditDerivativesMember 2017-12-31 0000091576 us-gaap:OtherDebtSecuritiesMember us-gaap:AvailableforsaleSecuritiesMember 2018-03-31 0000091576 us-gaap:CreditRiskContractMember 2017-12-31 0000091576 us-gaap:OtherInvestmentsMember 2017-12-31 0000091576 us-gaap:InterestRateContractMember 2017-12-31 0000091576 us-gaap:CreditRiskContractMember 2018-03-31 0000091576 key:LoansHeldForInvestmentFairValueMember 2018-03-31 0000091576 us-gaap:OtherInvestmentsMember 2018-06-30 0000091576 key:LoansHeldForSaleFairValueMember 2018-03-31 0000091576 us-gaap:OtherDebtSecuritiesMember us-gaap:AvailableforsaleSecuritiesMember 2017-12-31 0000091576 us-gaap:OtherCreditDerivativesMember 2018-06-30 0000091576 us-gaap:OtherInvestmentsMember 2018-03-31 0000091576 us-gaap:InterestRateContractMember 2018-03-31 0000091576 key:LoansHeldForSaleFairValueMember 2017-12-31 0000091576 us-gaap:OtherInvestmentsMember key:PrincipalDirectInvestmentsMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsNonrecurringMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsNonrecurringMember 2017-12-31 0000091576 us-gaap:FairValueMeasurementsNonrecurringMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsNonrecurringMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsNonrecurringMember 2018-06-30 0000091576 us-gaap:FairValueMeasurementsNonrecurringMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsNonrecurringMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsNonrecurringMember 2017-12-31 0000091576 us-gaap:OtherCreditDerivativesMember us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember key:EquityInvestmentsDirectMember 2018-06-30 0000091576 us-gaap:FairValueMeasurementsRecurringMember 2018-06-30 0000091576 us-gaap:CreditRiskContractMember us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:OtherDebtSecuritiesMember 2017-12-31 0000091576 us-gaap:OtherCreditDerivativesMember us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember 2017-12-31 0000091576 us-gaap:OtherCreditDerivativesMember us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember key:PrincipalDirectInvestmentsMember 2017-12-31 0000091576 us-gaap:CommodityContractMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember key:EquityInvestmentsDirectNAVMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CommercialMortgageBackedSecuritiesMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USStatesAndPoliticalSubdivisionsMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember key:EquityInvestmentsMember 2018-06-30 0000091576 us-gaap:FairValueMeasurementsRecurringMember us-gaap:CommercialMortgageBackedSecuritiesMember 2018-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USTreasuryAndGovernmentMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember 2018-06-30 0000091576 us-gaap:CommodityContractMember us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember 2018-06-30 0000091576 us-gaap:ForeignExchangeContractMember us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2018-06-30 0000091576 us-gaap:FairValueMeasurementsRecurringMember us-gaap:OtherDebtSecuritiesMember 2017-12-31 0000091576 us-gaap:CreditRiskContractMember us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2018-06-30 0000091576 us-gaap:FairValueMeasurementsRecurringMember key:EquityInvestmentsDirectMember 2018-06-30 0000091576 us-gaap:FairValueMeasurementsRecurringMember key:PrincipalInvestmentsMember 2017-12-31 0000091576 us-gaap:CommodityContractMember us-gaap:FairValueMeasurementsRecurringMember 2017-12-31 0000091576 us-gaap:CreditRiskContractMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USTreasuryAndGovernmentMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ShortMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:OtherDebtSecuritiesMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesOtherMember 2018-06-30 0000091576 us-gaap:OtherCreditDerivativesMember us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember 2018-06-30 0000091576 us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2018-06-30 0000091576 us-gaap:FairValueMeasurementsRecurringMember 2017-12-31 0000091576 us-gaap:ForeignExchangeContractMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember 2018-06-30 0000091576 us-gaap:CollateralizedMortgageObligationsMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember 2017-12-31 0000091576 us-gaap:CreditRiskContractMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USStatesAndPoliticalSubdivisionsMember 2018-06-30 0000091576 us-gaap:OtherCreditDerivativesMember us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USStatesAndPoliticalSubdivisionsMember 2017-12-31 0000091576 us-gaap:OtherCreditDerivativesMember us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember key:PrincipalIndirectInvestmentsMember 2018-06-30 0000091576 us-gaap:FairValueMeasurementsRecurringMember us-gaap:USStatesAndPoliticalSubdivisionsMember 2018-06-30 0000091576 us-gaap:CreditRiskContractMember us-gaap:FairValueMeasurementsRecurringMember 2017-12-31 0000091576 us-gaap:InterestRateContractMember us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USTreasuryAndGovernmentMember 2018-06-30 0000091576 us-gaap:FairValueMeasurementsRecurringMember us-gaap:ResidentialMortgageBackedSecuritiesMember us-gaap:MortgageBackedSecuritiesOtherMember 2017-12-31 0000091576 us-gaap:FairValueMeasurementsRecurringMember key:EquityInvestmentsMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:OtherDebtSecuritiesMember 2018-06-30 0000091576 us-gaap:OtherCreditDerivativesMember us-gaap:FairValueMeasurementsRecurringMember 2018-06-30 0000091576 us-gaap:OtherCreditDerivativesMember us-gaap:FairValueMeasurementsRecurringMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember key:PrincipalIndirectInvestmentsMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesOtherMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember key:EquityInvestmentsMember 2018-06-30 0000091576 us-gaap:CreditRiskContractMember us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2018-06-30 0000091576 us-gaap:FairValueMeasurementsRecurringMember key:EquityInvestmentsDirectNAVMember 2018-06-30 0000091576 us-gaap:CommodityContractMember us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2017-12-31 0000091576 us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesOtherMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember key:PrincipalDirectInvestmentsMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CommercialMortgageBackedSecuritiesMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ShortMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember key:PrincipalInvestmentsMember 2017-12-31 0000091576 us-gaap:FairValueMeasurementsRecurringMember us-gaap:ShortMember 2017-12-31 0000091576 us-gaap:OtherCreditDerivativesMember us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember 2018-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2017-12-31 0000091576 us-gaap:InterestRateContractMember us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2018-06-30 0000091576 us-gaap:FairValueMeasurementsRecurringMember us-gaap:USStatesAndPoliticalSubdivisionsMember 2017-12-31 0000091576 us-gaap:CreditRiskContractMember us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember key:EquityInvestmentsDirectMember 2017-12-31 0000091576 us-gaap:ForeignExchangeContractMember us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember key:EquityInvestmentsDirectNAVMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember key:EquityInvestmentsDirectNAVMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USTreasuryAndGovernmentMember 2018-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember 2017-12-31 0000091576 us-gaap:ForeignExchangeContractMember us-gaap:FairValueMeasurementsRecurringMember 2017-12-31 0000091576 us-gaap:InterestRateContractMember us-gaap:FairValueMeasurementsRecurringMember 2018-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:FairValueMeasurementsRecurringMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ShortMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember key:EquityInvestmentsDirectNAVMember 2018-06-30 0000091576 us-gaap:CommodityContractMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USStatesAndPoliticalSubdivisionsMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ResidentialMortgageBackedSecuritiesMember us-gaap:MortgageBackedSecuritiesOtherMember 2017-12-31 0000091576 us-gaap:InterestRateContractMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ResidentialMortgageBackedSecuritiesMember us-gaap:MortgageBackedSecuritiesOtherMember 2018-06-30 0000091576 us-gaap:FairValueMeasurementsRecurringMember key:PrincipalIndirectInvestmentsMember 2017-12-31 0000091576 us-gaap:InterestRateContractMember us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2017-12-31 0000091576 us-gaap:CollateralizedMortgageObligationsMember us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember key:PrincipalInvestmentsMember 2017-12-31 0000091576 us-gaap:InterestRateContractMember us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2018-06-30 0000091576 us-gaap:CollateralizedMortgageObligationsMember us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember 2017-12-31 0000091576 us-gaap:CreditRiskContractMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember key:PrincipalDirectInvestmentsMember 2017-12-31 0000091576 us-gaap:CreditRiskContractMember us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember key:PrincipalInvestmentsMember 2018-06-30 0000091576 us-gaap:FairValueMeasurementsRecurringMember key:PrincipalDirectInvestmentsMember 2017-12-31 0000091576 us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember key:EquityInvestmentsMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesOtherMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember key:EquityInvestmentsDirectNAVMember 2017-12-31 0000091576 us-gaap:OtherCreditDerivativesMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2017-12-31 0000091576 us-gaap:FairValueMeasurementsRecurringMember key:PrincipalDirectInvestmentsMember 2018-06-30 0000091576 us-gaap:CommodityContractMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ResidentialMortgageBackedSecuritiesMember us-gaap:MortgageBackedSecuritiesOtherMember 2018-06-30 0000091576 us-gaap:CommodityContractMember us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2018-06-30 0000091576 us-gaap:OtherCreditDerivativesMember us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2017-12-31 0000091576 us-gaap:FairValueMeasurementsRecurringMember key:PrincipalInvestmentsMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CommercialMortgageBackedSecuritiesMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ResidentialMortgageBackedSecuritiesMember us-gaap:MortgageBackedSecuritiesOtherMember 2017-12-31 0000091576 us-gaap:CommodityContractMember us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember key:EquityInvestmentsMember 2017-12-31 0000091576 us-gaap:ForeignExchangeContractMember us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USTreasuryAndGovernmentMember 2017-12-31 0000091576 us-gaap:FairValueMeasurementsRecurringMember us-gaap:OtherDebtSecuritiesMember 2018-06-30 0000091576 us-gaap:ForeignExchangeContractMember us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember 2017-12-31 0000091576 us-gaap:CreditRiskContractMember us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USTreasuryAndGovernmentMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CommercialMortgageBackedSecuritiesMember 2017-12-31 0000091576 us-gaap:ForeignExchangeContractMember us-gaap:FairValueMeasurementsRecurringMember 2018-06-30 0000091576 us-gaap:FairValueMeasurementsRecurringMember us-gaap:ResidentialMortgageBackedSecuritiesMember us-gaap:MortgageBackedSecuritiesOtherMember 2018-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember 2017-12-31 0000091576 us-gaap:ForeignExchangeContractMember us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember 2018-06-30 0000091576 us-gaap:CommodityContractMember us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember key:EquityInvestmentsMember 2018-06-30 0000091576 us-gaap:FairValueMeasurementsRecurringMember key:EquityInvestmentsDirectMember 2017-12-31 0000091576 us-gaap:CommodityContractMember us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2017-12-31 0000091576 us-gaap:ForeignExchangeContractMember us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:OtherDebtSecuritiesMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember key:PrincipalInvestmentsMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember key:PrincipalDirectInvestmentsMember 2018-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember 2018-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2017-12-31 0000091576 us-gaap:CommodityContractMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember 2017-12-31 0000091576 us-gaap:CreditRiskContractMember us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember key:PrincipalIndirectInvestmentsMember 2017-12-31 0000091576 us-gaap:FairValueMeasurementsRecurringMember us-gaap:USTreasuryAndGovernmentMember 2017-12-31 0000091576 us-gaap:ForeignExchangeContractMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember 2017-12-31 0000091576 us-gaap:ForeignExchangeContractMember us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2018-06-30 0000091576 us-gaap:FairValueMeasurementsRecurringMember us-gaap:USTreasuryAndGovernmentMember 2018-06-30 0000091576 us-gaap:CollateralizedMortgageObligationsMember us-gaap:FairValueMeasurementsRecurringMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CommercialMortgageBackedSecuritiesMember 2018-06-30 0000091576 us-gaap:CollateralizedMortgageObligationsMember us-gaap:FairValueMeasurementsRecurringMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember key:PrincipalIndirectInvestmentsMember 2017-12-31 0000091576 us-gaap:ForeignExchangeContractMember us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USStatesAndPoliticalSubdivisionsMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember key:EquityInvestmentsDirectMember 2017-12-31 0000091576 us-gaap:InterestRateContractMember us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ResidentialMortgageBackedSecuritiesMember us-gaap:MortgageBackedSecuritiesOtherMember 2017-12-31 0000091576 us-gaap:CreditRiskContractMember us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesOtherMember 2017-12-31 0000091576 us-gaap:InterestRateContractMember us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember 2017-12-31 0000091576 us-gaap:FairValueMeasurementsRecurringMember us-gaap:CommercialMortgageBackedSecuritiesMember 2017-12-31 0000091576 us-gaap:ForeignExchangeContractMember us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2017-12-31 0000091576 us-gaap:FairValueMeasurementsRecurringMember us-gaap:ShortMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ResidentialMortgageBackedSecuritiesMember us-gaap:MortgageBackedSecuritiesOtherMember 2018-06-30 0000091576 us-gaap:OtherCreditDerivativesMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember 2018-06-30 0000091576 us-gaap:CollateralizedMortgageObligationsMember us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember 2018-06-30 0000091576 us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesOtherMember 2017-12-31 0000091576 us-gaap:CollateralizedMortgageObligationsMember us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember key:PrincipalInvestmentsMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:OtherDebtSecuritiesMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:OtherDebtSecuritiesMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember key:PrincipalInvestmentsMember 2017-12-31 0000091576 us-gaap:FairValueMeasurementsRecurringMember key:EquityInvestmentsMember 2017-12-31 0000091576 us-gaap:CreditRiskContractMember us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember key:EquityInvestmentsDirectNAVMember 2017-12-31 0000091576 us-gaap:OtherCreditDerivativesMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember 2017-12-31 0000091576 us-gaap:CreditRiskContractMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2018-06-30 0000091576 us-gaap:ForeignExchangeContractMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ShortMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember key:EquityInvestmentsDirectMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USStatesAndPoliticalSubdivisionsMember 2017-12-31 0000091576 us-gaap:CommodityContractMember us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember 2017-12-31 0000091576 us-gaap:CommodityContractMember us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember 2018-06-30 0000091576 us-gaap:OtherCreditDerivativesMember us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2018-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember 2018-06-30 0000091576 us-gaap:FairValueMeasurementsRecurringMember key:EquityInvestmentsDirectNAVMember 2017-12-31 0000091576 us-gaap:OtherCreditDerivativesMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ShortMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember key:PrincipalIndirectInvestmentsMember 2017-12-31 0000091576 us-gaap:CreditRiskContractMember us-gaap:FairValueMeasurementsRecurringMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember key:PrincipalIndirectInvestmentsMember 2018-06-30 0000091576 us-gaap:CollateralizedMortgageObligationsMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember key:PrincipalDirectInvestmentsMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember key:EquityInvestmentsDirectMember 2018-06-30 0000091576 us-gaap:CommodityContractMember us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember 2017-12-31 0000091576 us-gaap:CommodityContractMember us-gaap:FairValueMeasurementsRecurringMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CommercialMortgageBackedSecuritiesMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember key:EquityInvestmentsMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember key:PrincipalDirectInvestmentsMember 2018-06-30 0000091576 us-gaap:CommodityContractMember us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:ShortMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesOtherMember 2017-12-31 0000091576 us-gaap:OtherCreditDerivativesMember us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2018-06-30 0000091576 us-gaap:CreditRiskContractMember us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember key:EquityInvestmentsDirectMember 2018-06-30 0000091576 us-gaap:FairValueMeasurementsRecurringMember key:PrincipalIndirectInvestmentsMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesOtherMember 2018-06-30 0000091576 us-gaap:ForeignExchangeContractMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2018-06-30 0000091576 us-gaap:ForeignExchangeContractMember us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:LongMember 2018-06-30 0000091576 us-gaap:OtherInvestmentsMember key:PrincipalDirectInvestmentsMember 2017-04-01 2017-06-30 0000091576 us-gaap:OtherInvestmentsMember key:PrincipalDirectInvestmentsMember 2017-01-01 2017-06-30 0000091576 us-gaap:CreditRiskContractMember 2017-04-01 2017-06-30 0000091576 us-gaap:OtherCreditDerivativesMember 2017-03-31 0000091576 us-gaap:OtherDebtSecuritiesMember us-gaap:AvailableforsaleSecuritiesMember 2017-01-01 2017-06-30 0000091576 us-gaap:OtherDebtSecuritiesMember us-gaap:AvailableforsaleSecuritiesMember 2017-04-01 2017-06-30 0000091576 us-gaap:InterestRateContractMember 2017-01-01 2017-06-30 0000091576 us-gaap:InterestRateContractMember 2017-04-01 2017-06-30 0000091576 us-gaap:CreditRiskContractMember 2017-01-01 2017-06-30 0000091576 us-gaap:OtherCreditDerivativesMember 2017-04-01 2017-06-30 0000091576 us-gaap:OtherCreditDerivativesMember 2017-01-01 2017-06-30 0000091576 us-gaap:OtherCreditDerivativesMember 2016-12-31 0000091576 us-gaap:OtherDebtSecuritiesMember us-gaap:AvailableforsaleSecuritiesMember 2017-06-30 0000091576 us-gaap:InterestRateContractMember 2017-06-30 0000091576 us-gaap:CreditRiskContractMember 2017-06-30 0000091576 us-gaap:OtherCreditDerivativesMember 2017-06-30 0000091576 us-gaap:OtherDebtSecuritiesMember us-gaap:AvailableforsaleSecuritiesMember 2017-03-31 0000091576 us-gaap:OtherInvestmentsMember key:PrincipalDirectInvestmentsMember 2017-06-30 0000091576 us-gaap:InterestRateContractMember 2016-12-31 0000091576 us-gaap:OtherInvestmentsMember key:PrincipalDirectInvestmentsMember 2016-12-31 0000091576 us-gaap:CreditRiskContractMember 2017-03-31 0000091576 us-gaap:OtherDebtSecuritiesMember us-gaap:AvailableforsaleSecuritiesMember 2016-12-31 0000091576 us-gaap:CreditRiskContractMember 2016-12-31 0000091576 us-gaap:OtherInvestmentsMember key:PrincipalDirectInvestmentsMember 2017-03-31 0000091576 us-gaap:InterestRateContractMember 2017-03-31 0000091576 us-gaap:CarryingReportedAmountFairValueDisclosureMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:EstimateOfFairValueFairValueDisclosureMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:EstimateOfFairValueFairValueDisclosureMember 2018-06-30 0000091576 us-gaap:EstimateOfFairValueFairValueDisclosureMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:EstimateOfFairValueFairValueDisclosureMember us-gaap:DesignatedAsHedgingInstrumentMember 2018-06-30 0000091576 us-gaap:EstimateOfFairValueFairValueDisclosureMember us-gaap:NondesignatedMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:EstimateOfFairValueFairValueDisclosureMember 2018-06-30 0000091576 us-gaap:EstimateOfFairValueFairValueDisclosureMember us-gaap:DesignatedAsHedgingInstrumentMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:EstimateOfFairValueFairValueDisclosureMember us-gaap:NondesignatedMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:EstimateOfFairValueFairValueDisclosureMember us-gaap:NondesignatedMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:EstimateOfFairValueFairValueDisclosureMember us-gaap:NondesignatedMember 2018-06-30 0000091576 us-gaap:CarryingReportedAmountFairValueDisclosureMember us-gaap:DesignatedAsHedgingInstrumentMember 2018-06-30 0000091576 us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember us-gaap:EstimateOfFairValueFairValueDisclosureMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:EstimateOfFairValueFairValueDisclosureMember us-gaap:DesignatedAsHedgingInstrumentMember 2018-06-30 0000091576 us-gaap:CarryingReportedAmountFairValueDisclosureMember us-gaap:NondesignatedMember 2018-06-30 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:EstimateOfFairValueFairValueDisclosureMember us-gaap:DesignatedAsHedgingInstrumentMember 2018-06-30 0000091576 key:DirectInvestmentsMember key:PrincipalInvestmentsMember 2018-01-01 2018-06-30 0000091576 key:IndirectInvestmentsMember key:PrincipalInvestmentsMember 2017-04-01 2017-06-30 0000091576 key:IndirectInvestmentsMember key:PrincipalInvestmentsMember 2018-06-30 0000091576 key:PrincipalInvestmentsMember 2018-04-01 2018-06-30 0000091576 key:DirectInvestmentsMember key:PrincipalInvestmentsMember 2018-04-01 2018-06-30 0000091576 key:PrincipalInvestmentsMember 2017-04-01 2017-06-30 0000091576 key:DirectInvestmentsMember key:PrincipalInvestmentsMember 2017-01-01 2017-06-30 0000091576 key:DirectInvestmentsMember key:PrincipalInvestmentsMember 2017-04-01 2017-06-30 0000091576 key:PrincipalInvestmentsMember 2017-01-01 2017-06-30 0000091576 key:IndirectInvestmentsMember key:PrincipalInvestmentsMember 2017-01-01 2017-06-30 0000091576 key:IndirectInvestmentsMember key:PrincipalInvestmentsMember 2018-04-01 2018-06-30 0000091576 key:IndirectInvestmentsMember key:PrincipalInvestmentsMember 2018-01-01 2018-06-30 0000091576 key:PrincipalInvestmentsMember 2018-06-30 0000091576 key:PrincipalInvestmentsMember 2018-01-01 2018-06-30 0000091576 key:DirectInvestmentsMember key:PrincipalInvestmentsMember 2018-06-30 0000091576 us-gaap:EstimateOfFairValueFairValueDisclosureMember key:EducationLendingMember us-gaap:SegmentDiscontinuedOperationsMember 2017-12-31 0000091576 us-gaap:CarryingReportedAmountFairValueDisclosureMember key:EducationLendingMember us-gaap:SegmentDiscontinuedOperationsMember 2017-12-31 0000091576 us-gaap:CarryingReportedAmountFairValueDisclosureMember key:EducationLendingMember us-gaap:SegmentDiscontinuedOperationsMember 2018-06-30 0000091576 key:IndirectInvestmentsMember srt:MaximumMember 2018-01-01 2018-06-30 0000091576 key:LIHTCAndHistoricTaxCreditInvestmentsMember 2017-12-31 0000091576 us-gaap:EstimateOfFairValueFairValueDisclosureMember us-gaap:FairValueMeasurementsNonrecurringMember 2018-06-30 0000091576 us-gaap:EstimateOfFairValueFairValueDisclosureMember key:EducationLendingMember us-gaap:SegmentDiscontinuedOperationsMember 2018-06-30 0000091576 2017-12-31 2017-12-31 0000091576 us-gaap:OtherInvestmentsMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember 2018-06-30 0000091576 us-gaap:OtherInvestmentsMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember 2017-12-31 0000091576 us-gaap:CarryingReportedAmountFairValueDisclosureMember us-gaap:NondesignatedMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:EstimateOfFairValueFairValueDisclosureMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:EstimateOfFairValueFairValueDisclosureMember 2017-12-31 0000091576 us-gaap:CarryingReportedAmountFairValueDisclosureMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:EstimateOfFairValueFairValueDisclosureMember us-gaap:DesignatedAsHedgingInstrumentMember 2017-12-31 0000091576 us-gaap:EstimateOfFairValueFairValueDisclosureMember 2017-12-31 0000091576 us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember us-gaap:EstimateOfFairValueFairValueDisclosureMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:EstimateOfFairValueFairValueDisclosureMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:EstimateOfFairValueFairValueDisclosureMember us-gaap:NondesignatedMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel3Member us-gaap:EstimateOfFairValueFairValueDisclosureMember us-gaap:NondesignatedMember 2017-12-31 0000091576 us-gaap:EstimateOfFairValueFairValueDisclosureMember us-gaap:NondesignatedMember 2017-12-31 0000091576 us-gaap:EstimateOfFairValueFairValueDisclosureMember us-gaap:DesignatedAsHedgingInstrumentMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel1Member us-gaap:EstimateOfFairValueFairValueDisclosureMember us-gaap:DesignatedAsHedgingInstrumentMember 2017-12-31 0000091576 us-gaap:CarryingReportedAmountFairValueDisclosureMember us-gaap:DesignatedAsHedgingInstrumentMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:EstimateOfFairValueFairValueDisclosureMember us-gaap:DesignatedAsHedgingInstrumentMember 2017-12-31 0000091576 us-gaap:FairValueInputsLevel2Member us-gaap:EstimateOfFairValueFairValueDisclosureMember us-gaap:NondesignatedMember 2017-12-31 0000091576 srt:WeightedAverageMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsNonrecurringMember us-gaap:MeasurementInputDiscountRateMember 2017-12-31 0000091576 srt:MinimumMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsNonrecurringMember us-gaap:MeasurementInputDiscountRateMember 2017-12-31 0000091576 srt:MaximumMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsNonrecurringMember us-gaap:MeasurementInputDiscountRateMember 2017-12-31 0000091576 srt:WeightedAverageMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember key:EbitdaMember 2017-12-31 0000091576 srt:WeightedAverageMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember key:EbitdaOneMember 2017-12-31 0000091576 srt:WeightedAverageMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember key:EbitdaMember 2018-06-30 0000091576 key:IndirectInvestmentsMember srt:MinimumMember 2018-01-01 2018-06-30 0000091576 us-gaap:EstimateOfFairValueFairValueDisclosureMember us-gaap:FairValueMeasurementsNonrecurringMember 2017-12-31 0000091576 us-gaap:CommercialMortgageBackedSecuritiesMember us-gaap:MortgageBackedSecuritiesOtherMember 2018-06-30 0000091576 us-gaap:OtherDebtSecuritiesMember 2017-12-31 0000091576 us-gaap:ResidentialMortgageBackedSecuritiesMember 2017-12-31 0000091576 us-gaap:USStatesAndPoliticalSubdivisionsMember 2018-06-30 0000091576 us-gaap:OtherDebtSecuritiesMember 2018-06-30 0000091576 us-gaap:CollateralizedMortgageObligationsMember 2017-12-31 0000091576 us-gaap:USStatesAndPoliticalSubdivisionsMember 2017-12-31 0000091576 us-gaap:USTreasuryAndGovernmentMember 2017-12-31 0000091576 us-gaap:USTreasuryAndGovernmentMember 2018-06-30 0000091576 us-gaap:ResidentialMortgageBackedSecuritiesMember 2018-06-30 0000091576 us-gaap:CommercialMortgageBackedSecuritiesMember us-gaap:MortgageBackedSecuritiesOtherMember 2017-12-31 0000091576 us-gaap:CollateralizedMortgageObligationsMember 2018-06-30 0000091576 us-gaap:CommercialMortgageBackedSecuritiesMember us-gaap:MortgageBackedSecuritiesOtherMember 2018-01-01 2018-06-30 0000091576 us-gaap:ResidentialMortgageBackedSecuritiesMember us-gaap:MortgageBackedSecuritiesOtherMember 2018-06-30 0000091576 us-gaap:ResidentialMortgageBackedSecuritiesMember us-gaap:MortgageBackedSecuritiesOtherMember 2018-01-01 2018-06-30 0000091576 us-gaap:CollateralizedMortgageObligationsMember 2018-01-01 2018-06-30 0000091576 us-gaap:CollateralizedMortgageObligationsMember 2018-06-30 0000091576 us-gaap:CommercialMortgageBackedSecuritiesMember 2018-06-30 0000091576 us-gaap:ResidentialMortgageBackedSecuritiesMember us-gaap:MortgageBackedSecuritiesOtherMember 2017-12-31 0000091576 us-gaap:CommercialMortgageBackedSecuritiesMember 2017-12-31 0000091576 key:BankingSubsidiaryMember srt:MaximumMember us-gaap:UnsecuredDebtMember 2018-06-30 0000091576 key:BankingSubsidiaryMember 2018-06-30 0000091576 key:BankingSubsidiaryMember srt:MaximumMember us-gaap:UnsecuredDebtMember 2017-12-31 0000091576 us-gaap:LongTermDebtMember us-gaap:InterestRateContractMember us-gaap:NondesignatedMember 2018-06-30 0000091576 key:BankingSubsidiaryMember us-gaap:UnsecuredDebtMember 2018-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember key:UnderwritingDiscountsFeesAndCommissionsMember 2018-01-01 2018-06-30 0000091576 us-gaap:ForeignExchangeContractMember us-gaap:NetInvestmentHedgingMember us-gaap:OtherIncomeMember 2018-01-01 2018-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember us-gaap:InterestIncomeMember 2018-01-01 2018-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember us-gaap:InterestExpenseMember 2017-01-01 2017-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember us-gaap:InterestExpenseMember 2018-01-01 2018-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember us-gaap:InterestIncomeMember 2017-01-01 2017-06-30 0000091576 us-gaap:ForeignExchangeContractMember us-gaap:NetInvestmentHedgingMember us-gaap:OtherIncomeMember 2017-01-01 2017-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember key:UnderwritingDiscountsFeesAndCommissionsMember 2017-01-01 2017-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:FairValueHedgingMember key:InterestExpenseLongTermDebtMember 2017-01-01 2017-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember key:InterestExpenseLongTermDebtMember 2017-01-01 2017-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:FairValueHedgingMember us-gaap:InterestIncomeMember 2018-01-01 2018-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember key:InterestExpenseLongTermDebtMember 2018-01-01 2018-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:FairValueHedgingMember us-gaap:OtherIncomeMember 2018-01-01 2018-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:FairValueHedgingMember key:InterestExpenseDepositsMember 2018-01-01 2018-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:FairValueHedgingMember us-gaap:OtherIncomeMember 2017-01-01 2017-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:FairValueHedgingMember key:InterestExpenseDepositsMember 2017-01-01 2017-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember us-gaap:OtherIncomeMember 2017-01-01 2017-06-30 0000091576 us-gaap:CashFlowHedgingMember us-gaap:OtherIncomeMember 2017-01-01 2017-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:FairValueHedgingMember us-gaap:InterestIncomeMember 2017-01-01 2017-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember key:InterestExpenseDepositsMember 2018-01-01 2018-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:FairValueHedgingMember key:InterestExpenseLongTermDebtMember 2018-01-01 2018-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember key:InterestExpenseDepositsMember 2017-01-01 2017-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember us-gaap:OtherIncomeMember 2018-01-01 2018-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember key:UnderwritingDiscountsFeesAndCommissionsMember 2018-04-01 2018-06-30 0000091576 us-gaap:ForeignExchangeContractMember us-gaap:NetInvestmentHedgingMember us-gaap:OtherIncomeMember 2017-04-01 2017-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember us-gaap:InterestIncomeMember 2017-04-01 2017-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember us-gaap:InterestExpenseMember 2017-04-01 2017-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember us-gaap:InterestIncomeMember 2018-04-01 2018-06-30 0000091576 us-gaap:ForeignExchangeContractMember us-gaap:NetInvestmentHedgingMember us-gaap:OtherIncomeMember 2018-04-01 2018-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember key:UnderwritingDiscountsFeesAndCommissionsMember 2017-04-01 2017-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember us-gaap:InterestExpenseMember 2018-04-01 2018-06-30 0000091576 us-gaap:InterestExpenseMember 2018-04-01 2018-06-30 0000091576 us-gaap:CreditRiskContractMember us-gaap:OtherIncomeMember 2017-01-01 2017-06-30 0000091576 us-gaap:CommodityContractMember 2018-01-01 2018-06-30 0000091576 us-gaap:OtherIncomeMember 2017-01-01 2017-06-30 0000091576 us-gaap:ForeignExchangeContractMember key:ConsumerMortgageIncomeMember 2018-01-01 2018-06-30 0000091576 key:CorporateServicesMember 2017-01-01 2017-06-30 0000091576 us-gaap:InterestRateContractMember key:CorporateServicesMember 2017-01-01 2017-06-30 0000091576 us-gaap:OtherCreditDerivativesMember us-gaap:OtherIncomeMember 2018-01-01 2018-06-30 0000091576 us-gaap:OtherCreditDerivativesMember key:CorporateServicesMember 2018-01-01 2018-06-30 0000091576 us-gaap:ForeignExchangeContractMember us-gaap:OtherIncomeMember 2017-01-01 2017-06-30 0000091576 us-gaap:CommodityContractMember key:CorporateServicesMember 2017-01-01 2017-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:OtherIncomeMember 2017-01-01 2017-06-30 0000091576 us-gaap:InterestRateContractMember key:CorporateServicesMember 2018-01-01 2018-06-30 0000091576 us-gaap:CreditRiskContractMember key:ConsumerMortgageIncomeMember 2017-01-01 2017-06-30 0000091576 us-gaap:CreditRiskContractMember us-gaap:OtherIncomeMember 2018-01-01 2018-06-30 0000091576 us-gaap:CommodityContractMember us-gaap:OtherIncomeMember 2017-01-01 2017-06-30 0000091576 us-gaap:CreditRiskContractMember key:CorporateServicesMember 2018-01-01 2018-06-30 0000091576 us-gaap:ForeignExchangeContractMember key:CorporateServicesMember 2018-01-01 2018-06-30 0000091576 us-gaap:ForeignExchangeContractMember 2018-01-01 2018-06-30 0000091576 key:ConsumerMortgageIncomeMember 2017-01-01 2017-06-30 0000091576 us-gaap:ForeignExchangeContractMember key:ConsumerMortgageIncomeMember 2017-01-01 2017-06-30 0000091576 us-gaap:CommodityContractMember key:CorporateServicesMember 2018-01-01 2018-06-30 0000091576 us-gaap:CommodityContractMember 2017-01-01 2017-06-30 0000091576 us-gaap:CreditRiskContractMember key:ConsumerMortgageIncomeMember 2018-01-01 2018-06-30 0000091576 us-gaap:OtherIncomeMember 2018-01-01 2018-06-30 0000091576 key:CorporateServicesMember 2018-01-01 2018-06-30 0000091576 us-gaap:CommodityContractMember us-gaap:OtherIncomeMember 2018-01-01 2018-06-30 0000091576 us-gaap:CommodityContractMember key:ConsumerMortgageIncomeMember 2017-01-01 2017-06-30 0000091576 us-gaap:OtherCreditDerivativesMember us-gaap:OtherIncomeMember 2017-01-01 2017-06-30 0000091576 us-gaap:OtherCreditDerivativesMember key:CorporateServicesMember 2017-01-01 2017-06-30 0000091576 us-gaap:OtherCreditDerivativesMember key:ConsumerMortgageIncomeMember 2018-01-01 2018-06-30 0000091576 us-gaap:InterestRateContractMember key:ConsumerMortgageIncomeMember 2018-01-01 2018-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:OtherIncomeMember 2018-01-01 2018-06-30 0000091576 us-gaap:ForeignExchangeContractMember 2017-01-01 2017-06-30 0000091576 us-gaap:InterestRateContractMember key:ConsumerMortgageIncomeMember 2017-01-01 2017-06-30 0000091576 key:ConsumerMortgageIncomeMember 2018-01-01 2018-06-30 0000091576 us-gaap:CommodityContractMember key:ConsumerMortgageIncomeMember 2018-01-01 2018-06-30 0000091576 us-gaap:OtherCreditDerivativesMember key:ConsumerMortgageIncomeMember 2017-01-01 2017-06-30 0000091576 us-gaap:ForeignExchangeContractMember key:CorporateServicesMember 2017-01-01 2017-06-30 0000091576 us-gaap:CreditRiskContractMember key:CorporateServicesMember 2017-01-01 2017-06-30 0000091576 us-gaap:ForeignExchangeContractMember us-gaap:OtherIncomeMember 2018-01-01 2018-06-30 0000091576 us-gaap:OtherCreditDerivativesMember 2017-12-31 0000091576 us-gaap:OtherCreditDerivativesMember 2018-01-01 2018-06-30 0000091576 us-gaap:OtherCreditDerivativesMember 2018-06-30 0000091576 us-gaap:OtherCreditDerivativesMember 2017-01-01 2017-06-30 0000091576 us-gaap:LongTermDebtMember us-gaap:InterestRateContractMember 2018-06-30 0000091576 us-gaap:CertificatesOfDepositMember us-gaap:InterestRateContractMember 2018-06-30 0000091576 us-gaap:BankTimeDepositsMember us-gaap:InterestRateContractMember 2018-06-30 0000091576 key:TwoRatingDowngradeMember srt:StandardPoorsAMinusRatingMember 2017-12-31 0000091576 key:OneRatingDowngradeMember srt:StandardPoorsAMinusRatingMember 2017-12-31 0000091576 key:OneRatingDowngradeMember srt:StandardPoorsAMinusRatingMember 2018-06-30 0000091576 key:ThreeRatingDowngradeMember srt:StandardPoorsAMinusRatingMember 2017-12-31 0000091576 key:OneRatingDowngradeMember srt:MoodysA3RatingMember 2017-12-31 0000091576 key:ThreeRatingDowngradeMember srt:MoodysA3RatingMember 2018-06-30 0000091576 key:ThreeRatingDowngradeMember srt:StandardPoorsAMinusRatingMember 2018-06-30 0000091576 key:TwoRatingDowngradeMember srt:StandardPoorsAMinusRatingMember 2018-06-30 0000091576 key:ThreeRatingDowngradeMember srt:MoodysA3RatingMember 2017-12-31 0000091576 key:TwoRatingDowngradeMember srt:MoodysA3RatingMember 2017-12-31 0000091576 key:OneRatingDowngradeMember srt:MoodysA3RatingMember 2018-06-30 0000091576 key:TwoRatingDowngradeMember srt:MoodysA3RatingMember 2018-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:NondesignatedMember 2018-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:DesignatedAsHedgingInstrumentMember 2017-12-31 0000091576 us-gaap:InterestRateContractMember us-gaap:NondesignatedMember 2017-12-31 0000091576 us-gaap:NondesignatedMember 2017-12-31 0000091576 us-gaap:CreditRiskContractMember us-gaap:NondesignatedMember 2017-12-31 0000091576 us-gaap:CommodityContractMember us-gaap:NondesignatedMember 2018-06-30 0000091576 us-gaap:NondesignatedMember 2018-06-30 0000091576 us-gaap:CommodityContractMember us-gaap:NondesignatedMember 2017-12-31 0000091576 us-gaap:ForeignExchangeContractMember us-gaap:NondesignatedMember 2017-12-31 0000091576 key:DerivativeFinancialInstrumentsAssetsLiabilitiesNetMember 2017-12-31 0000091576 key:CounterpartyAndCashCollateralNettingMember 2017-12-31 0000091576 us-gaap:InterestRateContractMember us-gaap:DesignatedAsHedgingInstrumentMember 2018-06-30 0000091576 us-gaap:CreditRiskContractMember us-gaap:NondesignatedMember 2018-06-30 0000091576 us-gaap:DesignatedAsHedgingInstrumentMember 2017-12-31 0000091576 us-gaap:ForeignExchangeContractMember us-gaap:DesignatedAsHedgingInstrumentMember 2017-12-31 0000091576 us-gaap:DesignatedAsHedgingInstrumentMember 2018-06-30 0000091576 key:DerivativeFinancialInstrumentsAssetsLiabilitiesNetMember 2018-06-30 0000091576 us-gaap:ForeignExchangeContractMember us-gaap:NondesignatedMember 2018-06-30 0000091576 us-gaap:OtherCreditDerivativesMember us-gaap:NondesignatedMember 2017-12-31 0000091576 key:CounterpartyAndCashCollateralNettingMember 2018-06-30 0000091576 us-gaap:OtherCreditDerivativesMember us-gaap:NondesignatedMember 2018-06-30 0000091576 us-gaap:ForeignExchangeContractMember us-gaap:DesignatedAsHedgingInstrumentMember 2018-06-30 0000091576 us-gaap:ForeignExchangeContractMember 2017-12-31 0000091576 us-gaap:CommodityContractMember 2017-12-31 0000091576 us-gaap:ForeignExchangeContractMember 2018-06-30 0000091576 us-gaap:CommodityContractMember 2018-06-30 0000091576 us-gaap:ForeignExchangeContractMember key:CorporateServicesMember 2017-04-01 2017-06-30 0000091576 us-gaap:InterestRateContractMember key:CorporateServicesMember 2018-04-01 2018-06-30 0000091576 us-gaap:ForeignExchangeContractMember key:CorporateServicesMember 2018-04-01 2018-06-30 0000091576 us-gaap:CommodityContractMember us-gaap:OtherIncomeMember 2018-04-01 2018-06-30 0000091576 us-gaap:ForeignExchangeContractMember 2017-04-01 2017-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:OtherIncomeMember 2017-04-01 2017-06-30 0000091576 us-gaap:OtherCreditDerivativesMember key:CorporateServicesMember 2018-04-01 2018-06-30 0000091576 us-gaap:CommodityContractMember 2017-04-01 2017-06-30 0000091576 us-gaap:ForeignExchangeContractMember key:ConsumerMortgageIncomeMember 2017-04-01 2017-06-30 0000091576 us-gaap:CommodityContractMember key:CorporateServicesMember 2017-04-01 2017-06-30 0000091576 us-gaap:OtherIncomeMember 2017-04-01 2017-06-30 0000091576 us-gaap:OtherCreditDerivativesMember key:ConsumerMortgageIncomeMember 2017-04-01 2017-06-30 0000091576 us-gaap:OtherCreditDerivativesMember key:ConsumerMortgageIncomeMember 2018-04-01 2018-06-30 0000091576 us-gaap:InterestRateContractMember key:CorporateServicesMember 2017-04-01 2017-06-30 0000091576 us-gaap:CommodityContractMember key:ConsumerMortgageIncomeMember 2018-04-01 2018-06-30 0000091576 us-gaap:CreditRiskContractMember key:ConsumerMortgageIncomeMember 2018-04-01 2018-06-30 0000091576 us-gaap:ForeignExchangeContractMember 2018-04-01 2018-06-30 0000091576 us-gaap:InterestRateContractMember key:ConsumerMortgageIncomeMember 2018-04-01 2018-06-30 0000091576 key:ConsumerMortgageIncomeMember 2018-04-01 2018-06-30 0000091576 us-gaap:CreditRiskContractMember key:ConsumerMortgageIncomeMember 2017-04-01 2017-06-30 0000091576 us-gaap:ForeignExchangeContractMember us-gaap:OtherIncomeMember 2018-04-01 2018-06-30 0000091576 key:ConsumerMortgageIncomeMember 2017-04-01 2017-06-30 0000091576 key:CorporateServicesMember 2017-04-01 2017-06-30 0000091576 us-gaap:CommodityContractMember 2018-04-01 2018-06-30 0000091576 us-gaap:OtherCreditDerivativesMember key:CorporateServicesMember 2017-04-01 2017-06-30 0000091576 us-gaap:CreditRiskContractMember us-gaap:OtherIncomeMember 2017-04-01 2017-06-30 0000091576 us-gaap:ForeignExchangeContractMember key:ConsumerMortgageIncomeMember 2018-04-01 2018-06-30 0000091576 us-gaap:InterestRateContractMember key:ConsumerMortgageIncomeMember 2017-04-01 2017-06-30 0000091576 us-gaap:OtherCreditDerivativesMember us-gaap:OtherIncomeMember 2017-04-01 2017-06-30 0000091576 us-gaap:ForeignExchangeContractMember us-gaap:OtherIncomeMember 2017-04-01 2017-06-30 0000091576 us-gaap:OtherIncomeMember 2018-04-01 2018-06-30 0000091576 us-gaap:OtherCreditDerivativesMember us-gaap:OtherIncomeMember 2018-04-01 2018-06-30 0000091576 us-gaap:CommodityContractMember us-gaap:OtherIncomeMember 2017-04-01 2017-06-30 0000091576 us-gaap:CreditRiskContractMember key:CorporateServicesMember 2018-04-01 2018-06-30 0000091576 us-gaap:CommodityContractMember key:ConsumerMortgageIncomeMember 2017-04-01 2017-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:OtherIncomeMember 2018-04-01 2018-06-30 0000091576 us-gaap:CreditRiskContractMember us-gaap:OtherIncomeMember 2018-04-01 2018-06-30 0000091576 us-gaap:CommodityContractMember key:CorporateServicesMember 2018-04-01 2018-06-30 0000091576 us-gaap:CreditRiskContractMember key:CorporateServicesMember 2017-04-01 2017-06-30 0000091576 key:CorporateServicesMember 2018-04-01 2018-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:FairValueHedgingMember us-gaap:OtherIncomeMember 2017-04-01 2017-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:FairValueHedgingMember us-gaap:InterestIncomeMember 2017-04-01 2017-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:FairValueHedgingMember key:InterestExpenseLongTermDebtMember 2018-04-01 2018-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:FairValueHedgingMember key:InterestExpenseLongTermDebtMember 2017-04-01 2017-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember key:InterestExpenseLongTermDebtMember 2017-04-01 2017-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember key:InterestExpenseDepositsMember 2018-04-01 2018-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember key:InterestExpenseDepositsMember 2017-04-01 2017-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:FairValueHedgingMember us-gaap:OtherIncomeMember 2018-04-01 2018-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember us-gaap:OtherIncomeMember 2018-04-01 2018-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:FairValueHedgingMember us-gaap:InterestIncomeMember 2018-04-01 2018-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember us-gaap:OtherIncomeMember 2017-04-01 2017-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember key:InterestExpenseLongTermDebtMember 2018-04-01 2018-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:FairValueHedgingMember key:InterestExpenseDepositsMember 2018-04-01 2018-06-30 0000091576 us-gaap:InterestRateContractMember us-gaap:FairValueHedgingMember key:InterestExpenseDepositsMember 2017-04-01 2017-06-30 0000091576 us-gaap:CashFlowHedgingMember us-gaap:OtherIncomeMember 2017-04-01 2017-06-30 0000091576 us-gaap:CreditIndexProductMember 2018-06-30 0000091576 us-gaap:CreditDefaultSwapMember 2018-06-30 0000091576 us-gaap:CreditIndexProductMember 2017-12-31 0000091576 us-gaap:CreditDefaultSwapMember 2017-12-31 0000091576 key:BankingSubsidiaryMember 2017-12-31 0000091576 us-gaap:CommercialMortgageBackedSecuritiesMember 2017-01-01 2017-06-30 0000091576 us-gaap:ResidentialMortgageBackedSecuritiesMember 2018-01-01 2018-06-30 0000091576 us-gaap:CommercialMortgageBackedSecuritiesMember 2018-01-01 2018-06-30 0000091576 us-gaap:ResidentialMortgageBackedSecuritiesMember 2017-04-01 2017-06-30 0000091576 us-gaap:ResidentialMortgageBackedSecuritiesMember 2018-01-01 2018-06-30 0000091576 us-gaap:ResidentialMortgageBackedSecuritiesMember 2017-01-01 2017-06-30 0000091576 us-gaap:ResidentialMortgageBackedSecuritiesMember 2017-06-30 0000091576 us-gaap:ResidentialMortgageBackedSecuritiesMember 2018-03-31 0000091576 us-gaap:ResidentialMortgageBackedSecuritiesMember 2016-12-31 0000091576 us-gaap:ResidentialMortgageBackedSecuritiesMember 2018-04-01 2018-06-30 0000091576 us-gaap:ResidentialMortgageBackedSecuritiesMember 2017-03-31 0000091576 us-gaap:CommercialMortgageBackedSecuritiesMember 2017-04-01 2017-06-30 0000091576 us-gaap:CommercialMortgageBackedSecuritiesMember 2017-06-30 0000091576 us-gaap:CommercialMortgageBackedSecuritiesMember 2018-01-01 2018-06-30 0000091576 us-gaap:CommercialMortgageBackedSecuritiesMember 2017-01-01 2017-06-30 0000091576 us-gaap:CommercialMortgageBackedSecuritiesMember 2016-12-31 0000091576 us-gaap:CommercialMortgageBackedSecuritiesMember 2018-03-31 0000091576 us-gaap:CommercialMortgageBackedSecuritiesMember 2018-04-01 2018-06-30 0000091576 us-gaap:CommercialMortgageBackedSecuritiesMember 2017-03-31 0000091576 srt:MinimumMember us-gaap:ResidentialMortgageBackedSecuritiesMember key:DiscountedCashFlowMember 2018-01-01 2018-06-30 0000091576 srt:MaximumMember us-gaap:CommercialMortgageBackedSecuritiesMember key:DiscountedCashFlowMember 2018-01-01 2018-06-30 0000091576 srt:MinimumMember us-gaap:CommercialMortgageBackedSecuritiesMember key:DiscountedCashFlowMember 2017-01-01 2017-06-30 0000091576 srt:WeightedAverageMember us-gaap:ResidentialMortgageBackedSecuritiesMember key:DiscountedCashFlowMember 2018-01-01 2018-06-30 0000091576 srt:WeightedAverageMember us-gaap:CommercialMortgageBackedSecuritiesMember key:DiscountedCashFlowMember 2017-01-01 2017-06-30 0000091576 srt:MaximumMember us-gaap:CommercialMortgageBackedSecuritiesMember key:DiscountedCashFlowMember 2017-01-01 2017-06-30 0000091576 srt:WeightedAverageMember us-gaap:CommercialMortgageBackedSecuritiesMember key:DiscountedCashFlowMember 2018-01-01 2018-06-30 0000091576 srt:MinimumMember us-gaap:CommercialMortgageBackedSecuritiesMember key:DiscountedCashFlowMember 2018-01-01 2018-06-30 0000091576 srt:MaximumMember us-gaap:ResidentialMortgageBackedSecuritiesMember key:DiscountedCashFlowMember 2018-01-01 2018-06-30 0000091576 srt:MinimumMember us-gaap:ResidentialMortgageBackedSecuritiesMember key:DiscountedCashFlowMember 2017-01-01 2017-06-30 0000091576 srt:MaximumMember us-gaap:ResidentialMortgageBackedSecuritiesMember key:DiscountedCashFlowMember 2017-01-01 2017-06-30 0000091576 srt:WeightedAverageMember us-gaap:ResidentialMortgageBackedSecuritiesMember key:DiscountedCashFlowMember 2017-01-01 2017-06-30 0000091576 us-gaap:ResidentialMortgageBackedSecuritiesMember 2017-01-01 2017-06-30 0000091576 us-gaap:InvestmentsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-06-30 0000091576 key:QualifiedAffordableHousingProjectsInvestmentMember key:VariableInterestSponsorsMember 2017-12-31 0000091576 key:QualifiedAffordableHousingProjectsInvestmentMember key:VariableInterestSponsorsMember 2018-06-30 0000091576 us-gaap:InvestmentsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2017-12-31 0000091576 us-gaap:InvestmentsMember key:VariableInterestSponsorsMember 2017-01-01 2017-06-30 0000091576 key:VariableInterestSponsorsMember