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Activity Related to Mortgage Banking Net Revenue (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mortgage Loans On Real Estate [Line Items]    
Residential mortgage loan sales $ 1,001us-gaap_MortgageLoansOnRealEstateCostOfMortgagesSold [1],[2] $ 1,672us-gaap_MortgageLoansOnRealEstateCostOfMortgagesSold [1]
Residential Mortgage Loans | Troubled Debt Restructuring | Loans Held For Sale    
Mortgage Loans On Real Estate [Line Items]    
Residential mortgage loan sales $ 568us-gaap_MortgageLoansOnRealEstateCostOfMortgagesSold
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fitb_TroubledDebtRestructuringOnNonaccrualStatusMember
/ us-gaap_MajorPropertyClassAxis
= fitb_LoansHeldForSaleMember		  
[1] Represents the unpaid principal balance at the time of the sale.
[2] Excludes $568 of HFS residential mortgage loans previously modified in a TDR that were sold during the first quarter of 2015.