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Commitments, Contingent Liabilities and Guarantees - Additional Information (Detail) (USD $)
Share data in Millions, unless otherwise specified
 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2013
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2009
Sep. 30, 2014
Sep. 30, 2012
Mar. 31, 2012
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2010
Loss Contingencies [Line Items]                      
Letters of credit   $ 3,781,000,000us-gaap_LineOfCredit   $ 3,974,000,000us-gaap_LineOfCredit              
Total Variable Rate Demand Notes   1,500,000,000fitb_TotalVariableRateDemandNotes   1,700,000,000fitb_TotalVariableRateDemandNotes              
Letters of credit issued by the Bancorp related to variable rate demand notes   1,100,000,000fitb_LettersCreditIssuedRelatedVariableRateDemandNotes   1,200,000,000fitb_LettersCreditIssuedRelatedVariableRateDemandNotes              
Margin account balance held by the brokerage clearing agent   14,000,000us-gaap_MarginDepositAssets   13,000,000us-gaap_MarginDepositAssets              
Repurchase Claim Settlement 25,000,000fitb_RepurchaseClaimSettlement                    
Amount in excess of amounts reserved   61,000,000us-gaap_LossContingencyRangeOfPossibleLossPortionNotAccrued                  
Credit loss reserve 1,582,000,000us-gaap_LoansAndLeasesReceivableAllowance 1,300,000,000us-gaap_LoansAndLeasesReceivableAllowance [1] 1,483,000,000us-gaap_LoansAndLeasesReceivableAllowance 1,322,000,000us-gaap_LoansAndLeasesReceivableAllowance [1]              
Residential Mortgage                      
Loss Contingencies [Line Items]                      
Amount in excess of amounts reserved   44,000,000us-gaap_LossContingencyRangeOfPossibleLossPortionNotAccrued
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		                  
Outstanding balances on residential mortgage loans sold with representation and warranty provisions 44,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		 36,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		 38,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		 35,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		              
Outstanding balances on residential mortgage loans sold with credit recourse   535,000,000fitb_LoansSoldWithCreditRecourse
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		   548,000,000fitb_LoansSoldWithCreditRecourse
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		              
Delinquency Rates   3.40%fitb_DelinquencyRates
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		   4.00%fitb_DelinquencyRates
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		              
Credit loss reserve   10,000,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		   11,000,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		              
Make Whole Payments   1,000,000fitb_MakeWholePayments
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		 7,000,000fitb_MakeWholePayments
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		                
Repurchased Outstanding Principal   9,000,000fitb_RepurchasedOutstandingPrincipal
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		 23,000,000fitb_RepurchasedOutstandingPrincipal
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		                
Repurchase Demand Request   9,000,000fitb_RepurchaseDemandRequest
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		 35,000,000fitb_RepurchaseDemandRequest
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		                
Outstanding Repurchase Demand Inventory   4,000,000fitb_OutstandingRepurchaseDemandInventory
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		   7,000,000fitb_OutstandingRepurchaseDemandInventory
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		              
Secured Debt                      
Loss Contingencies [Line Items]                      
Fully and unconditionally guaranteed certain long-term borrowing obligations issued by wholly-owned issuing trust entities   62,000,000us-gaap_BorrowingsUnderGuaranteedInvestmentAgreements
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		   62,000,000us-gaap_BorrowingsUnderGuaranteedInvestmentAgreements
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		              
Standby Letters of Credit                      
Loss Contingencies [Line Items]                      
Reserve for unfunded commitments       1,000,000fitb_ReserveForUnfundedCreditCommitments
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= us-gaap_StandbyLettersOfCreditMember		              
Standby letters of credit as a percentage of total letters of credit   97.00%fitb_PercentageOfLetterOfCredit
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= us-gaap_StandbyLettersOfCreditMember		   97.00%fitb_PercentageOfLetterOfCredit
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= us-gaap_StandbyLettersOfCreditMember		              
Standby Letters of Credit | Secured Debt                      
Loss Contingencies [Line Items]                      
Standby letters of credit as a percentage of total letters of credit   61.00%fitb_PercentageOfLetterOfCredit
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= us-gaap_StandbyLettersOfCreditMember		   60.00%fitb_PercentageOfLetterOfCredit
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= us-gaap_StandbyLettersOfCreditMember		              
Variable Rate Demand Note                      
Loss Contingencies [Line Items]                      
Fifth Third Securities, Inc. (FTS) acted as the remarketing agent to issuers of VRDNs   1,300,000,000us-gaap_NotesPayable
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= fitb_VariableRateDemandNoteMember		   1,400,000,000us-gaap_NotesPayable
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= fitb_VariableRateDemandNoteMember		              
Letters of credit   234,000,000us-gaap_LineOfCredit
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= fitb_VariableRateDemandNoteMember		   247,000,000us-gaap_LineOfCredit
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= fitb_VariableRateDemandNoteMember		              
Variable Rate Demand Note | Trading Securities                      
Loss Contingencies [Line Items]                      
Total Variable Rate Demand Notes   20,000,000fitb_TotalVariableRateDemandNotes
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_TradingAccountAssetsMember
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= fitb_VariableRateDemandNoteMember		                  
Other Liabilities                      
Loss Contingencies [Line Items]                      
Reserve for unfunded commitments   130,000,000fitb_ReserveForUnfundedCreditCommitments
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember		   135,000,000fitb_ReserveForUnfundedCreditCommitments
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember		              
Other Liabilities | Residential Mortgage                      
Loss Contingencies [Line Items]                      
Outstanding balances on residential mortgage loans sold with representation and warranty provisions   36,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		   35,000,000us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember		              
Private Mortgage Reinsurance                      
Loss Contingencies [Line Items]                      
Total outstanding reinsurance coverage   28,000,000us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= fitb_PrivateMortgageReinsuranceMember		   29,000,000us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= fitb_PrivateMortgageReinsuranceMember		              
Approximate reserve related to exposures within the reinsurance portfolio   2,000,000us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= fitb_PrivateMortgageReinsuranceMember		   2,000,000us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= fitb_PrivateMortgageReinsuranceMember		              
Private Mortgage Reinsurance | Lower Limit                      
Loss Contingencies [Line Items]                      
Reinsurance coverage ranges of the total PMI coverage   5.00%fitb_PercentageOfReinsuranceCoverage
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= fitb_PrivateMortgageReinsuranceMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		                  
Private Mortgage Reinsurance | Upper Limit                      
Loss Contingencies [Line Items]                      
Reinsurance coverage ranges of the total PMI coverage   10.00%fitb_PercentageOfReinsuranceCoverage
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= fitb_PrivateMortgageReinsuranceMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		                  
Visa Litigation                      
Loss Contingencies [Line Items]                      
Recorded share of litigation formally settled by Visa and for probable future litigation settlements   60,000,000us-gaap_LossContingencyEstimateOfPossibleLoss
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= fitb_VisaLitigationMember		   49,000,000us-gaap_LossContingencyEstimateOfPossibleLoss
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= fitb_VisaLitigationMember		              
Visa deposited into the litigation escrow account         3,000,000,000us-gaap_EscrowDeposit
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= fitb_VisaLitigationMember		            
Visa                      
Loss Contingencies [Line Items]                      
Visa IPO, shares of Visa's Class B common stock received         10.1fitb_StockReceivedInInitialPublicOfferingShares
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= fitb_VisaMember		            
Visa deposited into the litigation escrow account           $ 450,000,000us-gaap_EscrowDeposit
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= fitb_VisaMember		 $ 150,000,000us-gaap_EscrowDeposit
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= fitb_VisaMember		 $ 1,565,000,000us-gaap_EscrowDeposit
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= fitb_VisaMember		 $ 400,000,000us-gaap_EscrowDeposit
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= fitb_VisaMember		 $ 800,000,000us-gaap_EscrowDeposit
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= fitb_VisaMember		 $ 500,000,000us-gaap_EscrowDeposit
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= fitb_VisaMember
[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.