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Loans - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans $ 68,063,000,000 $ 79,810,000,000 $ 68,063,000,000 $ 79,810,000,000 $ 73,875,000,000
Net deferred origination fees 25,000,000   25,000,000   48,000,000
Net unamortized premium (discount) 1,000,000   1,000,000   (5,000,000)
Commercial loans removed from TDR classification 0 0 0 0  
Commercial Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 48,588,000,000   48,588,000,000   54,216,000,000
Loans which were classified as TDR loans during previous 12 months which became contractually delinquent 0 $ 0 0 $ 0  
Consumer Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans $ 19,475,000,000   $ 19,475,000,000   19,659,000,000
Weighted average rate of reduction 1.78% 1.54% 1.71% 1.68%  
Loans which were classified as TDR loans during previous 12 months which became contractually delinquent $ 2,000,000 $ 4,000,000 $ 5,000,000 $ 15,000,000  
Affiliated Entity [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans $ 1,423,000,000 $ 5,072,000,000 $ 1,423,000,000 $ 5,072,000,000 $ 3,274,000,000