XML 68 R133.htm IDEA: XBRL DOCUMENT v2.4.1.9
Long-Term Debt - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2011
Dec. 31, 2012
Debt Instrument [Line Items]        
Long-term debt $ 14,967,000,000us-gaap_LongTermDebt [1] $ 9,633,000,000us-gaap_LongTermDebt [1]    
Debt, outstanding principal balance 14,600,000,000fitb_DebtPrincipalOutstanding 9,400,000,000fitb_DebtPrincipalOutstanding    
Debt, discounts and premiums 25,000,000us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet 21,000,000us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet    
Additions for mark-to-market adjustments on hedged debt 407,000,000us-gaap_DerivativeAmountOfHedgedItem 278,000,000us-gaap_DerivativeAmountOfHedgedItem    
Parent Company Only        
Debt Instrument [Line Items]        
Long-term debt 5,394,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 4,757,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		    
Parent Company Only | Senior Debt Obligations | Fixed Rate 3.625 Percent Notes Due 2016        
Debt Instrument [Line Items]        
Issue of senior notes to third party investors     1,000,000,000us-gaap_DebtDefaultLongtermDebtAmount
/ us-gaap_DebtInstrumentAxis
= fitb_FixedRate3Point625PercentNotesDue2016Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorDebtObligationsMember		  
Parent Company Only | Senior Debt Obligations | Fixed Rate 2.30 Percent Notes Due 2019        
Debt Instrument [Line Items]        
Long-term debt 499,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= fitb_Fixedrate230percentnotesdue2019Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorDebtObligationsMember		      
Issue of senior notes to third party investors 500,000,000us-gaap_DebtDefaultLongtermDebtAmount
/ us-gaap_DebtInstrumentAxis
= fitb_Fixedrate230percentnotesdue2019Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorDebtObligationsMember		      
Debt Instrument Maturity Date Range Start Feb. 28, 2014      
Debt Instrument Maturity Date Range End Mar. 01, 2019      
Parent Company Only | Senior Debt Obligations | Fixed Rate 3.50 Percent Notes Due 2022        
Debt Instrument [Line Items]        
Issue of senior notes to third party investors       500,000,000us-gaap_DebtDefaultLongtermDebtAmount
/ us-gaap_DebtInstrumentAxis
= fitb_FixedRate3Point50PercentNotesDue2022Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorDebtObligationsMember
Parent Company Only | Subordinated debt | Floating Rate 0.67 Percent Notes Due 2016        
Debt Instrument [Line Items]        
Long-term debt 250,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= fitb_FloatingRate067PercentNotesDue2016Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember		 [2] 250,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= fitb_FloatingRate067PercentNotesDue2016Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember		 [2]    
Debt Instrument Maturity Date Range Start Dec. 13, 2006 [2]      
Debt Instrument Maturity Date Range End Dec. 20, 2016 [2]      
Parent Company Only | Subordinated debt | Floating Rate 0.67 Percent Notes Due 2016 | Three Month LIBOR        
Debt Instrument [Line Items]        
Basis points 42      
Parent Company Only | Subordinated debt | Fixed Rate 5.45 Percent Notes Due 2017        
Debt Instrument [Line Items]        
Long-term debt 539,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= fitb_FixedRate545PercentNotesDue2017Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember		 [2] 558,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= fitb_FixedRate545PercentNotesDue2017Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember		 [2]    
Debt Instrument Maturity Date Range Start Dec. 20, 2006 [2]      
Debt Instrument Maturity Date Range End Jan. 15, 2017 [2]      
Interest rate paid 0.69%us-gaap_DebtInstrumentInterestRateEffectivePercentage
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= fitb_FixedRate545PercentNotesDue2017Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember		      
Parent Company Only | Subordinated debt | Fixed Rate 5.45 Percent Notes Due 2017 | Three Month LIBOR        
Debt Instrument [Line Items]        
Basis points 42      
Parent Company Only | Subordinated debt | Fixed Rate 4.50 Percent Notes Due 2018        
Debt Instrument [Line Items]        
Long-term debt 544,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= fitb_FixedRate450PercentNotesDue2018Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember		 [2] 555,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= fitb_FixedRate450PercentNotesDue2018Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember		 [2]    
Debt Instrument Maturity Date Range Start May 23, 2003 [2]      
Debt Instrument Maturity Date Range End Jun. 01, 2018 [2]      
Interest rate paid 0.48%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= fitb_FixedRate450PercentNotesDue2018Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember		      
Parent Company Only | Subordinated debt | Fixed Rate 4.50 Percent Notes Due 2018 | Three Month LIBOR        
Debt Instrument [Line Items]        
Basis points 25      
Parent Company Only | Subordinated debt | Fixed Rate 4.30 Notes Due 2024        
Debt Instrument [Line Items]        
Long-term debt 748,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= fitb_Fixedrate430percentnotesdue2024Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember		 [2] 748,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= fitb_Fixedrate430percentnotesdue2024Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember		 [2]    
Issue of senior notes to third party investors   750,000,000us-gaap_DebtDefaultLongtermDebtAmount
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= fitb_Fixedrate430percentnotesdue2024Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember		    
Debt Instrument Maturity Date Range Start Nov. 20, 2013 [2]      
Debt Instrument Maturity Date Range End Jan. 16, 2024 [2]      
Parent Company Only | Subordinated debt | Fixed Rate 8.25 Percent Notes Due 2038        
Debt Instrument [Line Items]        
Long-term debt 1,317,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= fitb_FixedRate825PercentNotesDue2038Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember		 [2] 1,150,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= fitb_FixedRate825PercentNotesDue2038Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember		 [2]    
Issue of senior notes to third party investors 1,000,000,000us-gaap_DebtDefaultLongtermDebtAmount
/ us-gaap_DebtInstrumentAxis
= fitb_FixedRate825PercentNotesDue2038Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember		      
Debt Instrument Maturity Date Range Start Mar. 04, 2008 [2]      
Debt Instrument Maturity Date Range End Mar. 01, 2038 [2]      
Amount of debt converted to floating rate 705,000,000fitb_NotionalAmountOfFloatingInterestRateDebtWithInterestRateHedge
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= fitb_FixedRate825PercentNotesDue2038Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember		      
Interest rate paid 3.28%us-gaap_DebtInstrumentInterestRateEffectivePercentage
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= fitb_FixedRate825PercentNotesDue2038Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember		      
Subsidiaries        
Debt Instrument [Line Items]        
Long-term debt 9,573,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		      
Debt, available for future issuance 19,100,000,000us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		      
Global Bank Note Program 25,000,000,000fitb_GlobalBankNoteProgram
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		 20,000,000,000fitb_GlobalBankNoteProgram
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		    
Subsidiaries | Federal Home Loan Bank Advances 0.05 To 6.87 Percent Due 2015 Through 2041        
Debt Instrument [Line Items]        
Residential mortgage loans and securities serving as FHLB collateral 20,500,000,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember		      
FHLB advance 41,000,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember		      
FHLB advances maturing 2015 2,000,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember		      
FHLB advances maturing 2016 3,000,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromOneToTwoYearsOfBalanceSheetDate
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember		      
FHLB advances maturing 2017 1,000,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromTwoToThreeYearsOfBalanceSheetDate
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember		      
FHLB advances maturing 2018 4,000,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromThreeToFourYearsOfBalanceSheetDate
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember		      
FHLB advances maturing 2019 9,000,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromFourToFiveYearsOfBalanceSheetDate
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember		      
FHLB advances maturing thereafter 22,000,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueAfterFiveYearsOfBalanceSheetDate
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember		      
Subsidiaries | Senior Debt Obligations        
Debt Instrument [Line Items]        
Issue of senior notes to third party investors 1,500,000,000us-gaap_DebtDefaultLongtermDebtAmount
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorDebtObligationsMember		      
Subsidiaries | Senior Debt Obligations | Group 1        
Debt Instrument [Line Items]        
Issue of senior notes to third party investors   1,300,000,000us-gaap_DebtDefaultLongtermDebtAmount
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorDebtObligationsMember
/ us-gaap_RangeAxis
= fitb_Group1Member		    
Subsidiaries | Senior Debt Obligations | Group 2        
Debt Instrument [Line Items]        
Issue of senior notes to third party investors   1,800,000,000us-gaap_DebtDefaultLongtermDebtAmount
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorDebtObligationsMember
/ us-gaap_RangeAxis
= fitb_Group2Member		    
Subsidiaries | Senior Debt Obligations | Floating Rate 0.67 Percent Notes Due 2016        
Debt Instrument [Line Items]        
Issue of senior notes to third party investors   300,000,000us-gaap_DebtDefaultLongtermDebtAmount
/ us-gaap_DebtInstrumentAxis
= fitb_FloatingRate067PercentNotesDue2016Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorDebtObligationsMember		    
Subsidiaries | Senior Debt Obligations | Fixed Rate 1.15 Percent Notes Due 2016        
Debt Instrument [Line Items]        
Long-term debt 1,000,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= fitb_FixedRate115PercentNotesDue2016Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorDebtObligationsMember		 1,000,000,000us-gaap_LongTermDebt
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= fitb_FixedRate115PercentNotesDue2016Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorDebtObligationsMember		    
Issue of senior notes to third party investors   1,000,000,000us-gaap_DebtDefaultLongtermDebtAmount
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= fitb_FixedRate115PercentNotesDue2016Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorDebtObligationsMember		    
Debt Instrument Maturity Date Range Start Nov. 20, 2013      
Debt Instrument Maturity Date Range End Nov. 18, 2016      
Subsidiaries | Senior Debt Obligations | Fixed Rate 0.90 Percent Notes Due 2016        
Debt Instrument [Line Items]        
Long-term debt 400,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= fitb_Fixedrate090percentnotesdue2016Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorDebtObligationsMember		 400,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= fitb_Fixedrate090percentnotesdue2016Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorDebtObligationsMember		    
Issue of senior notes to third party investors   400,000,000us-gaap_DebtDefaultLongtermDebtAmount
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= fitb_Fixedrate090percentnotesdue2016Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorDebtObligationsMember		    
Debt Instrument Maturity Date Range Start Feb. 28, 2013      
Debt Instrument Maturity Date Range End Feb. 26, 2016      
Subsidiaries | Senior Debt Obligations | Floating Rate 0.74 Percent Notes Due 2016        
Debt Instrument [Line Items]        
Long-term debt 750,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= fitb_Floatingrate074percentnotesdue2016Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorDebtObligationsMember		 750,000,000us-gaap_LongTermDebt
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= fitb_Floatingrate074percentnotesdue2016Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorDebtObligationsMember		    
Issue of senior notes to third party investors   750,000,000us-gaap_DebtDefaultLongtermDebtAmount
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= fitb_Floatingrate074percentnotesdue2016Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorDebtObligationsMember		    
Debt Instrument Maturity Date Range Start Nov. 20, 2013      
Debt Instrument Maturity Date Range End Nov. 18, 2016      
Subsidiaries | Senior Debt Obligations | Floating Rate 0.74 Percent Notes Due 2016 | Three Month LIBOR        
Debt Instrument [Line Items]        
Basis points 51 41      
Subsidiaries | Senior Debt Obligations | Floating Rate 0.64 Percent Notes Due 2016        
Debt Instrument [Line Items]        
Long-term debt 300,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= fitb_FloatingRate064PercentNotesDue2016Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorDebtObligationsMember		 300,000,000us-gaap_LongTermDebt
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/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorDebtObligationsMember		    
Debt Instrument Maturity Date Range Start Feb. 28, 2013      
Debt Instrument Maturity Date Range End Feb. 26, 2016      
Subsidiaries | Senior Debt Obligations | Fixed rate 1.35 percent notes due 2017        
Debt Instrument [Line Items]        
Long-term debt 654,000,000us-gaap_LongTermDebt
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= fitb_Fixedrate135percentnotesdue2017Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorDebtObligationsMember		      
Issue of senior notes to third party investors 650,000,000us-gaap_DebtDefaultLongtermDebtAmount
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/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorDebtObligationsMember		      
Debt Instrument Maturity Date Range Start Apr. 25, 2014      
Debt Instrument Maturity Date Range End Jun. 01, 2017      
Subsidiaries | Senior Debt Obligations | Fixed Rate 1.45 Percent Notes Due 2018        
Debt Instrument [Line Items]        
Long-term debt 597,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= fitb_Fixedrate145percentnotesdue2018Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorDebtObligationsMember		 587,000,000us-gaap_LongTermDebt
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= fitb_Fixedrate145percentnotesdue2018Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorDebtObligationsMember		    
Issue of senior notes to third party investors   600,000,000us-gaap_DebtDefaultLongtermDebtAmount
/ us-gaap_DebtInstrumentAxis
= fitb_Fixedrate145percentnotesdue2018Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorDebtObligationsMember		    
Debt Instrument Maturity Date Range Start Feb. 28, 2013      
Debt Instrument Maturity Date Range End Feb. 28, 2018      
Subsidiaries | Senior Debt Obligations | Fixed Rate 2.375 Percent Notes Due 2019        
Debt Instrument [Line Items]        
Long-term debt 850,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= fitb_Fixedrate2375percentnotesdue2019Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorDebtObligationsMember		      
Issue of senior notes to third party investors 850,000,000us-gaap_DebtDefaultLongtermDebtAmount
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/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorDebtObligationsMember		      
Debt Instrument Maturity Date Range Start Apr. 25, 2014      
Debt Instrument Maturity Date Range End Apr. 25, 2019      
Subsidiaries | Senior Debt Obligations | Fixed rate 2.875 percent notes due 2021        
Debt Instrument [Line Items]        
Long-term debt 846,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= fitb_Fixedrate2875percentnotesdue2021Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorDebtObligationsMember		      
Issue of senior notes to third party investors 850,000,000us-gaap_DebtDefaultLongtermDebtAmount
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/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorDebtObligationsMember		      
Debt Instrument Maturity Date Range Start Sep. 05, 2014      
Debt Instrument Maturity Date Range End Oct. 01, 2021      
Subsidiaries | Subordinated debt | Fixed Rate 4.75 Percent Bank Notes Due 2015        
Debt Instrument [Line Items]        
Long-term debt 502,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= fitb_FixedRate475PercentBankNotesDue2015Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember		 [2] 524,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= fitb_FixedRate475PercentBankNotesDue2015Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember		 [2]    
Debt Instrument Maturity Date Range Start Jan. 31, 2005 [2]      
Debt Instrument Maturity Date Range End Feb. 01, 2015 [2]      
Interest rate paid 0.33%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= fitb_FixedRate475PercentBankNotesDue2015Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember		      
Subsidiaries | Junior subordinated debt | Floating Rate 224 Percent Bank Notes Due 2035 | Three Month LIBOR | Group 1        
Debt Instrument [Line Items]        
Basis points 169      
Subsidiaries | Junior subordinated debt | Floating Rate 224 Percent Bank Notes Due 2035 | Three Month LIBOR | Group 2        
Debt Instrument [Line Items]        
Basis points 142      
Subsidiaries | Variable Interest Entity, Primary Beneficiary | Automobile Loan Securitizations        
Debt Instrument [Line Items]        
Debt, outstanding principal balance $ 3,400,000,000fitb_DebtPrincipalOutstanding
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/ us-gaap_LongtermDebtTypeAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		      
[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] Qualify as Tier II capital for regulatory capital purposes.