XML 128 R129.htm IDEA: XBRL DOCUMENT v2.4.1.9
Carrying Amounts and Estimated Fair Values for Certain Financial Instruments (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Financial assets:        
Cash and due from banks $ 2,920us-gaap_CashAndDueFromBanks [1] $ 3,091us-gaap_CashAndDueFromBanks [1] $ 3,153us-gaap_CashAndDueFromBanks $ 3,178us-gaap_CashAndDueFromBanks
Held-to-maturity securities, amortized cost 177us-gaap_HeldToMaturitySecurities [2] 187us-gaap_HeldToMaturitySecurities [2]    
Other short-term investments 4,919us-gaap_OtherShortTermInvestments 7,914us-gaap_OtherShortTermInvestments    
Loans held for sale 724us-gaap_LoansReceivableHeldForSaleNet [3] 1,261us-gaap_LoansReceivableHeldForSaleNet [3]    
Portfolio loans and leases, net 89,944us-gaap_LoansAndLeasesReceivableNetReportedAmount 88,762us-gaap_LoansAndLeasesReceivableNetReportedAmount    
Other securities, fair value 26,409us-gaap_AvailableForSaleSecurities [4] 22,408us-gaap_AvailableForSaleSecurities [4]    
Held-to-maturity securities, fair value 177us-gaap_HeldToMaturitySecuritiesFairValue 187us-gaap_HeldToMaturitySecuritiesFairValue    
Loans held for sale 689us-gaap_LoansHeldForSaleFairValueDisclosure 561us-gaap_LoansHeldForSaleFairValueDisclosure    
Financial liabilities:        
Deposits 103,415us-gaap_Deposits 101,712us-gaap_Deposits    
Federal funds purchased 200us-gaap_FederalFundsPurchased 144us-gaap_FederalFundsPurchased    
Other short-term borrowings 1,413us-gaap_OtherShortTermBorrowings 1,556us-gaap_OtherShortTermBorrowings    
Long-term debt 14,055us-gaap_LongTermDebt [1] 14,967us-gaap_LongTermDebt [1]    
Residential Mortgage        
Financial assets:        
Portfolio loans and leases at fair value 126us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		   103us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		  
Carrying (Reported) Amount, Fair Value Disclosure        
Financial assets:        
Cash and due from banks 2,920us-gaap_CashAndDueFromBanks
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 3,091us-gaap_CashAndDueFromBanks
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		    
Held-to-maturity securities, amortized cost 177us-gaap_HeldToMaturitySecurities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 187us-gaap_HeldToMaturitySecurities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		    
Other short-term investments 4,919us-gaap_OtherShortTermInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 7,914us-gaap_OtherShortTermInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		    
Unallocated Allowance For Loan And Lease Losses (104)fitb_UnallocatedAllowanceForLoanAndLeaseLosses
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 (106)fitb_UnallocatedAllowanceForLoanAndLeaseLosses
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		    
Portfolio loans and leases at fair value 89,818us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 88,654us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		    
Financial liabilities:        
Deposits 103,415us-gaap_Deposits
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 101,712us-gaap_Deposits
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		    
Federal funds purchased 200us-gaap_FederalFundsPurchased
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 144us-gaap_FederalFundsPurchased
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		    
Other short-term borrowings 1,413us-gaap_OtherShortTermBorrowings
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 1,556us-gaap_OtherShortTermBorrowings
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		    
Long-term debt 14,055us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 14,967us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		    
Carrying (Reported) Amount, Fair Value Disclosure | Non Fair Value Option Held For Sale Loans [Member]        
Financial assets:        
Loans held for sale 35us-gaap_LoansReceivableHeldForSaleNet
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ fitb_NonFairValueOptionHeldForSaleLoansAxis
= fitb_NonFairValueOptionHeldForSaleLoansMember		 700us-gaap_LoansReceivableHeldForSaleNet
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ fitb_NonFairValueOptionHeldForSaleLoansAxis
= fitb_NonFairValueOptionHeldForSaleLoansMember		    
Carrying (Reported) Amount, Fair Value Disclosure | FHLB and FRB restricted stock holdings        
Financial assets:        
Other securities 600us-gaap_OtherMarketableSecuritiesCurrent
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fitb_FhlbAndFrbRestrictedStockHoldingsMember		 600us-gaap_OtherMarketableSecuritiesCurrent
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fitb_FhlbAndFrbRestrictedStockHoldingsMember		    
Carrying (Reported) Amount, Fair Value Disclosure | Commercial and Industrial Loans        
Financial assets:        
Portfolio loans and leases, net 41,385us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_FinancialInstrumentAxis
= fitb_CommercialAndIndustrialLoansMember		 40,092us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_FinancialInstrumentAxis
= fitb_CommercialAndIndustrialLoansMember		    
Carrying (Reported) Amount, Fair Value Disclosure | Commercial Mortgage Loans        
Financial assets:        
Portfolio loans and leases, net 7,085us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_FinancialInstrumentAxis
= fitb_CommercialMortgageLoansMember		 7,259us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_FinancialInstrumentAxis
= fitb_CommercialMortgageLoansMember		    
Carrying (Reported) Amount, Fair Value Disclosure | Commercial Construction        
Financial assets:        
Portfolio loans and leases, net 2,283us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		 2,052us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		    
Carrying (Reported) Amount, Fair Value Disclosure | Commercial Leases        
Financial assets:        
Portfolio loans and leases, net 3,744us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_FinancialInstrumentAxis
= fitb_CommercialLeasesMember		 3,675us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_FinancialInstrumentAxis
= fitb_CommercialLeasesMember		    
Carrying (Reported) Amount, Fair Value Disclosure | Residential Mortgage        
Financial assets:        
Portfolio loans and leases, net 12,340us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		 12,177us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		    
Carrying (Reported) Amount, Fair Value Disclosure | Home Equity        
Financial assets:        
Portfolio loans and leases, net 8,629us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember		 8,799us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember		    
Carrying (Reported) Amount, Fair Value Disclosure | Automobile Loan Securitizations        
Financial assets:        
Portfolio loans and leases, net 11,834us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember		 12,004us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember		    
Carrying (Reported) Amount, Fair Value Disclosure | Credit Card Loan [Member]        
Financial assets:        
Portfolio loans and leases, net 2,187us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CreditCardReceivablesMember		 2,297us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CreditCardReceivablesMember		    
Carrying (Reported) Amount, Fair Value Disclosure | Other Consumer Loans and Leases        
Financial assets:        
Portfolio loans and leases, net 435us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerOtherFinancingReceivableMember		 405us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerOtherFinancingReceivableMember		    
Portion at Fair Value        
Financial assets:        
Cash and due from banks, fair value 2,920us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member		 3,091us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member		    
Held-to-maturity securities, fair value 177us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member		 187us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member		    
Other short term investments, fair value 4,919fitb_OtherShortTermInvestmentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member		 7,914fitb_OtherShortTermInvestmentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member		    
Portfolio loans and leases at fair value 90,771us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member		 89,041us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member		    
Financial liabilities:        
Deposits, fair value 103,477us-gaap_DepositsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member		 101,715us-gaap_DepositsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member		    
Federal funds purchased, fair value 200us-gaap_FederalFundsPurchasedFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member		 144us-gaap_FederalFundsPurchasedFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member		    
Other short-term borrowings, fair value 1,415us-gaap_ShorttermDebtFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member		 1,561us-gaap_ShorttermDebtFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member		    
Long term debt, fair value 14,799us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member		 15,648us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member		    
Portion at Fair Value | Non Fair Value Option Held For Sale Loans [Member]        
Financial assets:        
Loans held for sale 35us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member
/ fitb_NonFairValueOptionHeldForSaleLoansAxis
= fitb_NonFairValueOptionHeldForSaleLoansMember		 700us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member
/ fitb_NonFairValueOptionHeldForSaleLoansAxis
= fitb_NonFairValueOptionHeldForSaleLoansMember		    
Portion at Fair Value | FHLB and FRB restricted stock holdings        
Financial assets:        
Other securities, fair value 600us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fitb_FhlbAndFrbRestrictedStockHoldingsMember		 600us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fitb_FhlbAndFrbRestrictedStockHoldingsMember		    
Portion at Fair Value | Commercial and Industrial Loans        
Financial assets:        
Portfolio loans and leases at fair value 42,250us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member
/ us-gaap_FinancialInstrumentAxis
= fitb_CommercialAndIndustrialLoansMember		 40,781us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member
/ us-gaap_FinancialInstrumentAxis
= fitb_CommercialAndIndustrialLoansMember		    
Portion at Fair Value | Commercial Mortgage Loans        
Financial assets:        
Portfolio loans and leases at fair value 6,694us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member
/ us-gaap_FinancialInstrumentAxis
= fitb_CommercialMortgageLoansMember		 6,878us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member
/ us-gaap_FinancialInstrumentAxis
= fitb_CommercialMortgageLoansMember		    
Portion at Fair Value | Commercial Construction        
Financial assets:        
Portfolio loans and leases at fair value 1,934us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		 1,735us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		    
Portion at Fair Value | Commercial Leases        
Financial assets:        
Portfolio loans and leases at fair value 3,539us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member
/ us-gaap_FinancialInstrumentAxis
= fitb_CommercialLeasesMember		 3,426us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member
/ us-gaap_FinancialInstrumentAxis
= fitb_CommercialLeasesMember		    
Portion at Fair Value | Residential Mortgage        
Financial assets:        
Portfolio loans and leases at fair value 12,638us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		 12,249us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		    
Portion at Fair Value | Home Equity        
Financial assets:        
Portfolio loans and leases at fair value 9,192us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember		 9,224us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember		    
Portion at Fair Value | Automobile Loan Securitizations        
Financial assets:        
Portfolio loans and leases at fair value 11,594us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember		 11,748us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AutomobileLoanMember		    
Portion at Fair Value | Credit Card Loan [Member]        
Financial assets:        
Portfolio loans and leases at fair value 2,487us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CreditCardReceivablesMember		 2,586us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CreditCardReceivablesMember		    
Portion at Fair Value | Other Consumer Loans and Leases        
Financial assets:        
Portfolio loans and leases at fair value 443us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerOtherFinancingReceivableMember		 414us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerOtherFinancingReceivableMember		    
Portion at Fair Value | Fair Value, Inputs, Level 1        
Financial assets:        
Cash and due from banks, fair value 2,920us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member		 3,091us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member		    
Other short term investments, fair value 4,919fitb_OtherShortTermInvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member		 7,914fitb_OtherShortTermInvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member		    
Financial liabilities:        
Federal funds purchased, fair value 200us-gaap_FederalFundsPurchasedFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member		 144us-gaap_FederalFundsPurchasedFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member		    
Long term debt, fair value 14,103us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member		 14,993us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member		    
Portion at Fair Value | Fair Value, Inputs, Level 2        
Financial liabilities:        
Deposits, fair value 103,477us-gaap_DepositsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member		 101,715us-gaap_DepositsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member		    
Other short-term borrowings, fair value 1,415us-gaap_ShorttermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
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= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member		    
Long term debt, fair value 696us-gaap_LongTermDebtFairValue
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/ us-gaap_FairValueByMeasurementBasisAxis
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Portion at Fair Value | Fair Value, Inputs, Level 2 | FHLB and FRB restricted stock holdings        
Financial assets:        
Other securities, fair value 600us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementBasisAxis
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Portion at Fair Value | Fair Value, Inputs, Level 3        
Financial assets:        
Held-to-maturity securities, fair value 177us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementBasisAxis
= fitb_PortionAtFairValueFairValueDisclosure1Member		    
Portfolio loans and leases at fair value 90,771us-gaap_LoansReceivableFairValueDisclosure
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/ us-gaap_FairValueByMeasurementBasisAxis
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= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementBasisAxis
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Portion at Fair Value | Fair Value, Inputs, Level 3 | Non Fair Value Option Held For Sale Loans [Member]        
Financial assets:        
Loans held for sale 35us-gaap_LoansHeldForSaleFairValueDisclosure
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Portion at Fair Value | Fair Value, Inputs, Level 3 | Commercial and Industrial Loans        
Financial assets:        
Portfolio loans and leases at fair value 42,250us-gaap_LoansReceivableFairValueDisclosure
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/ us-gaap_FinancialInstrumentAxis
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Portion at Fair Value | Fair Value, Inputs, Level 3 | Commercial Mortgage Loans        
Financial assets:        
Portfolio loans and leases at fair value 6,694us-gaap_LoansReceivableFairValueDisclosure
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/ us-gaap_FinancialInstrumentAxis
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Portion at Fair Value | Fair Value, Inputs, Level 3 | Commercial Construction        
Financial assets:        
Portfolio loans and leases at fair value 1,934us-gaap_LoansReceivableFairValueDisclosure
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/ us-gaap_FinancialInstrumentAxis
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Portion at Fair Value | Fair Value, Inputs, Level 3 | Commercial Leases        
Financial assets:        
Portfolio loans and leases at fair value 3,539us-gaap_LoansReceivableFairValueDisclosure
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/ us-gaap_FinancialInstrumentAxis
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Portion at Fair Value | Fair Value, Inputs, Level 3 | Residential Mortgage        
Financial assets:        
Portfolio loans and leases at fair value 12,638us-gaap_LoansReceivableFairValueDisclosure
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/ us-gaap_FinancialInstrumentAxis
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/ us-gaap_FinancialInstrumentAxis
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Portion at Fair Value | Fair Value, Inputs, Level 3 | Home Equity        
Financial assets:        
Portfolio loans and leases at fair value 9,192us-gaap_LoansReceivableFairValueDisclosure
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Portion at Fair Value | Fair Value, Inputs, Level 3 | Automobile Loan Securitizations        
Financial assets:        
Portfolio loans and leases at fair value 11,594us-gaap_LoansReceivableFairValueDisclosure
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Portion at Fair Value | Fair Value, Inputs, Level 3 | Credit Card Loan [Member]        
Financial assets:        
Portfolio loans and leases at fair value 2,487us-gaap_LoansReceivableFairValueDisclosure
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Portion at Fair Value | Fair Value, Inputs, Level 3 | Other Consumer Loans and Leases        
Financial assets:        
Portfolio loans and leases at fair value $ 443us-gaap_LoansReceivableFairValueDisclosure
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[1] Includes $176 and $179 of cash and due from banks, $48 and $47 of commercial mortgage loans, $2,900 and $3,331 of automobile loans, $(23) and $(22) of ALLL, $26 and $25 of other assets, $4 and $5 of other liabilities, and $2,983 and $3,434 of long-term debt from consolidated VIEs that are included in their respective captions above at March 31, 2015 and December 31, 2014, respectively. For further information refer to Note 10.
[2] Fair value of $177 and $187 at March 31, 2015 and December 31, 2014, respectively.
[3] Includes $689 and $561 of residential mortgage loans held for sale measured at fair value at March 31, 2015 and December 31, 2014, respectively.
[4] Amortized cost of $25,475 and $21,677 at March 31, 2015 and December 31, 2014, respectively.