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Subsequent Event - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Apr. 30, 2015
Subsequent Event [Line Items]      
Shares acquired for treasury $ 180us-gaap_TreasuryStockValueAcquiredCostMethod $ 99us-gaap_TreasuryStockValueAcquiredCostMethod  
Subsequent events | March 2014 Repurchase Program      
Subsequent Event [Line Items]      
Total shares repurchased 6,704,835us-gaap_StockRedeemedOrCalledDuringPeriodShares
/ us-gaap_StatementClassOfStockAxis
= fitb_March2014RepurchaseProgramMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		    
Shares acquired for treasury     $ 155us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_StatementClassOfStockAxis
= fitb_March2014RepurchaseProgramMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Redemption date     Apr. 30, 2015