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Summary of the Credit Risk Profile of the Bancorp's Residential Mortgage and Consumer Portfolio Segments by Class (Parenthetical) (Detail) (Residential Mortgage, USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Residential Mortgage
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Portfolio loans and leases at fair value $ 126us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember		 $ 108us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember