Derivative Instruments - Asset and Liability Management Derivative Positions of Company (Parenthetical) (Detail) - Asset and Liability Management Positions [Member] - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
Notional Value, Liabilities	$ 29,569	$ 22,818
Fair Value, Liabilities	700	286
Notional Value, Assets	27,926	27,442
Underwriting Purchase and Sale Commitments [Member]
Derivative [Line Items]
Notional Value, Liabilities	285	36
Notional Value, Assets	285	36
Swap [Member] | Visa Class B Shares [Member]
Derivative [Line Items]
Notional Value, Liabilities	712	626
Fair Value, Liabilities	$ 98	$ 64
Derivative Liability Average Remaining Maturity Period	3 years 9 months	2 years 9 months