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Summary of the ALLL and Related Loans and Leases Classified by Portfolio Segment (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan and lease losses $ 1,322us-gaap_LoansAndLeasesReceivableAllowance [1],[2] $ 1,582us-gaap_LoansAndLeasesReceivableAllowance [1],[3] $ 1,854us-gaap_LoansAndLeasesReceivableAllowance $ 2,255us-gaap_LoansAndLeasesReceivableAllowance
Notes Receivable Net 89,976us-gaap_NotesReceivableNet [4],[5] 88,522us-gaap_NotesReceivableNet [6],[7]    
Number of Contracts 11,102us-gaap_FinancingReceivableModificationsNumberOfContracts2 [8],[9] 11,291us-gaap_FinancingReceivableModificationsNumberOfContracts2 [8],[9] 16,064us-gaap_FinancingReceivableModificationsNumberOfContracts2 [8],[9]  
Recorded Investment 2,233us-gaap_ImpairedFinancingReceivableRecordedInvestment [10] 3,353us-gaap_ImpairedFinancingReceivableRecordedInvestment [11]    
Consolidated Variable Interest Entity        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan and lease losses 22us-gaap_LoansAndLeasesReceivableAllowance
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		 15us-gaap_LoansAndLeasesReceivableAllowance
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		    
Commercial | Consolidated Variable Interest Entity        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan and lease losses 10us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		 11us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		    
Number of Contracts 5us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		 5us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		    
Recorded Investment 28us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		 28us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		    
Leveraged Leases        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance for loan and lease losses 6us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fitb_LeveragedLeasesMember		 9us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fitb_LeveragedLeasesMember		    
Portfolio loans and leases at fair value 874us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fitb_LeveragedLeasesMember		 881us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fitb_LeveragedLeasesMember		    
Residential Mortgage Loans        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Portfolio loans and leases at fair value $ 108us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialPortfolioSegmentMember		      
[1] At December 31, 2014 and 2013, includes $179 and $49 of cash and due from banks, $47 and $48 of commercial mortgage loans, $3,331 and $1,010 of automobile loans, $(22) and $(15) of ALLL, $25 and $13 of other assets, $5 and $1 of other liabilities, $3,434 and $1,048 of long-term debt from consolidated VIEs that are included in their respective captions. For further information, refer to Note 10.
[2] Includes $6 related to leveraged leases.
[3] Includes $9 related to leveraged leases.
[4] Excludes $108 of residential mortgage loans measured at fair value, and includes $874 of leveraged leases, net of unearned income.
[5] Excludes $108 of loans measured at fair value.
[6] Excludes $92 of residential mortgage loans measured at fair value, and includes $881 of leveraged leases, net of unearned income.
[7] Excludes $92 of loans measured at fair value.
[8] Excludes all loans and leases held for sale and loans acquired with deteriorated credit quality.
[9] Represents number of loans post-modification.
[10] Includes $869, $485 and $420, respectively, of commercial, residential mortgage and consumer TDRs on accrual status; $214, $33 and $63, respectively, of commercial, residential mortgage and consumer TDRs on nonaccrual status.
[11] Includes $869, $1,241 and $444, respectively, of commercial, residential mortgage and consumer TDRs on accrual status; $228, $84 and $52, respectively, of commercial, residential mortgage and consumer TDRs on nonaccrual status.