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Subsequent Event (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jan. 27, 2015
Subsequent Event [Line Items]        
Shares acquired for treasury $ 654us-gaap_TreasuryStockValueAcquiredCostMethod $ 1,320us-gaap_TreasuryStockValueAcquiredCostMethod $ 650us-gaap_TreasuryStockValueAcquiredCostMethod  
Subsequent event | March 2014 Repurchase Program        
Subsequent Event [Line Items]        
Total shares repurchased 8,542,713us-gaap_StockRedeemedOrCalledDuringPeriodShares
/ us-gaap_StatementClassOfStockAxis
= fitb_March2014RepurchaseProgramMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		      
Shares acquired for treasury       $ 180us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_StatementClassOfStockAxis
= fitb_March2014RepurchaseProgramMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Redemption date       Jan. 27, 2015