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Related Party Transactions - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended 3 Months Ended
Mar. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2010
Jun. 30, 2014
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2009
Related Party Transaction [Line Items]                    
Gain on sale of Vantiv Holding, LLC $ 115,000,000us-gaap_EquityMethodInvestmentNetSalesProceeds                  
Income recognized on Equity method investments in Vantiv Holding, LLC   48,000,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss 77,000,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss 61,000,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss            
Dividend on Equity method investment in Vantiv Holding, LLC   23,000,000us-gaap_InvestmentIncomeDividend 40,000,000us-gaap_InvestmentIncomeDividend 30,000,000us-gaap_InvestmentIncomeDividend            
Service fee paid to Vantiv Holding, LLC   83,000,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty 88,000,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty 83,000,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty            
Outstanding balance of loans owed to the Bancorp from Vantiv Holding, LLC         1,250,000,000fitb_OutstandingLoanBalance          
Loans to related parties   63,000,000us-gaap_DueFromRelatedParties 86,000,000us-gaap_DueFromRelatedParties              
Line Of Credit   3,974,000,000us-gaap_LineOfCredit 4,129,000,000us-gaap_LineOfCredit              
During Deconversion Period                    
Related Party Transaction [Line Items]                    
Revenue From Related Parties   1,000,000us-gaap_RevenueFromRelatedParties
/ fitb_ReferencePeriodDisclosureAxis
= fitb_DuringDeconversionPeriodMember		 1,000,000us-gaap_RevenueFromRelatedParties
/ fitb_ReferencePeriodDisclosureAxis
= fitb_DuringDeconversionPeriodMember		 1,000,000us-gaap_RevenueFromRelatedParties
/ fitb_ReferencePeriodDisclosureAxis
= fitb_DuringDeconversionPeriodMember		            
Beyond Deconversion Period                    
Related Party Transaction [Line Items]                    
Revenue From Related Parties   44,000,000us-gaap_RevenueFromRelatedParties
/ fitb_ReferencePeriodDisclosureAxis
= fitb_BeyondDeconversionPeriodMember		 34,000,000us-gaap_RevenueFromRelatedParties
/ fitb_ReferencePeriodDisclosureAxis
= fitb_BeyondDeconversionPeriodMember		 34,000,000us-gaap_RevenueFromRelatedParties
/ fitb_ReferencePeriodDisclosureAxis
= fitb_BeyondDeconversionPeriodMember		            
Vantiv Holding, LLC                    
Related Party Transaction [Line Items]                    
Percentage of Vantiv Holding, LLC sold to Advent for cash and warrants                   51.00%fitb_Equitymethodinvestmentownershippercentagesold
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fitb_FTPSHoldingLLCMember
Equity Method Investment, Ownership Percentage 39.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fitb_FTPSHoldingLLCMember		 23.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fitb_FTPSHoldingLLCMember		   33.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fitb_FTPSHoldingLLCMember		 [1]   23.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fitb_FTPSHoldingLLCMember		 [1] 25.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fitb_FTPSHoldingLLCMember		 [1] 28.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fitb_FTPSHoldingLLCMember		 [1] 33.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fitb_FTPSHoldingLLCMember		 [1] 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fitb_FTPSHoldingLLCMember
Gain on sale of Vantiv Holding, LLC           125,000,000us-gaap_EquityMethodInvestmentNetSalesProceeds
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fitb_FTPSHoldingLLCMember		 85,000,000us-gaap_EquityMethodInvestmentNetSalesProceeds
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fitb_FTPSHoldingLLCMember		 242,000,000us-gaap_EquityMethodInvestmentNetSalesProceeds
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fitb_FTPSHoldingLLCMember		 157,000,000us-gaap_EquityMethodInvestmentNetSalesProceeds
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fitb_FTPSHoldingLLCMember		  
Loans to related parties   204,000,000us-gaap_DueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fitb_FTPSHoldingLLCMember		 348,000,000us-gaap_DueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fitb_FTPSHoldingLLCMember		              
Interest income relating to the Vantiv Holding, LLC loans   5,000,000fitb_InterestIncomeFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fitb_FTPSHoldingLLCMember		 7,000,000fitb_InterestIncomeFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fitb_FTPSHoldingLLCMember		 11,000,000fitb_InterestIncomeFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fitb_FTPSHoldingLLCMember		            
Line Of Credit   $ 50,000,000us-gaap_LineOfCredit
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fitb_FTPSHoldingLLCMember		 $ 50,000,000us-gaap_LineOfCredit
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fitb_FTPSHoldingLLCMember		              
Vantiv Holding, LLC | Class B Units                    
Related Party Transaction [Line Items]                    
Units of Vantiv Holding LLC Held   43,000,000fitb_EquityMethodInvestmentSharesHeld
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fitb_FTPSHoldingLLCMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		                
Vantiv Holding, LLC | Class C Units                    
Related Party Transaction [Line Items]                    
Units of Vantiv Holding LLC Held   20,400,000fitb_EquityMethodInvestmentSharesHeld
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fitb_FTPSHoldingLLCMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember		                
Vantiv, Inc.                    
Related Party Transaction [Line Items]                    
Voting Power In Vantiv   18.50%fitb_VotingPowerInVantiv
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fitb_FTPSINCMember		                
Vantiv, Inc. | Class B Units                    
Related Party Transaction [Line Items]                    
Shares held in Vantiv, Inc.   43,000,000fitb_SharesHeldVantivInc
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fitb_FTPSINCMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		                
[1] The Bancorp’s remaining investment in Vantiv Holding, LLC of $394 as of December 31, 2014 was accounted for as an equity method investment in the Bancorp’s Consolidated Financial Statements.