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Composition of the Company's Loan Portfolio (Additional Information) (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, Fair Value Disclosure $ 268us-gaap_LoansReceivableFairValueDisclosure $ 272us-gaap_LoansReceivableFairValueDisclosure
Loans Held-for-sale, Fair Value Disclosure 2,077us-gaap_LoansHeldForSaleFairValueDisclosure 1,892us-gaap_LoansHeldForSaleFairValueDisclosure
Residential Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, Fair Value Disclosure $ 268us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember		 $ 272us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember