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Other Assets - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2014
Jun. 30, 2014
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Mar. 31, 2012
Jun. 30, 2009
Other assets                
Private Equity Fund Impairment $ 4fitb_PrivateEquityFundImpairment              
Vantiv Holding, LLC                
Other assets                
Percentage of Vantiv Holding, LLC sold to Advent for cash and warrants               51.00%fitb_Equitymethodinvestmentownershippercentagesold
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fitb_FTPSHoldingLLCMember
Percentage of ownership under the equity method of accounting   23.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fitb_FTPSHoldingLLCMember		 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] 39.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fitb_FTPSHoldingLLCMember		 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fitb_FTPSHoldingLLCMember
[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.