XML 100 R80.htm IDEA: XBRL DOCUMENT v3.6.0.2
Composition of the Company's Loan Portfolio (Additional Information) (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, Fair Value Disclosure $ 222 $ 257
Loans Held-for-sale, Fair Value Disclosure 3,540 1,494
Residential Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, Fair Value Disclosure $ 222 $ 257