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Composition of the Company's Loan Portfolio (Additional Information) (Detail) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, Fair Value Disclosure $ 246 $ 257
Loans Held-for-sale, Fair Value Disclosure 2,176 1,494
Residential Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, Fair Value Disclosure $ 246 $ 257