Derivative Instruments - Asset and Liability Management Derivative Positions of Company (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Swap [Member] | Visa Class B Shares [Member]
Derivative [Line Items]
Notional Value, Liabilities	$ 1,800	$ 1,800
Fair Value, Liabilities	$ 153	$ 165
Derivative Liability Average Remaining Maturity Period	2 years 3 months	2 years 6 months
Underwriting Purchase and Sale Commitments [Member]
Derivative [Line Items]
Notional Value, Assets	$ 1,000	$ 34
Notional Value, Liabilities	$ 1,000	$ 34