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Derivative Instruments - Asset and Liability Management Derivative Positions of Company (Parenthetical) (Detail) - Asset and Liability Management Positions [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Derivative [Line Items]    
Notional Value, Liabilities $ 19,339 $ 22,818
Fair Value, Liabilities 249 286
Notional Value, Assets 27,266 27,442
Underwriting Purchase and Sale Commitments [Member]    
Derivative [Line Items]    
Notional Value, Liabilities 19 36
Notional Value, Assets 19 36
Swap [Member] | Visa Class B Shares [Member]    
Derivative [Line Items]    
Notional Value, Liabilities 811 626
Fair Value, Liabilities $ 106 $ 64
Derivative Liability Average Remaining Maturity Period 3 years 6 months 2 years 9 months