Derivative Instruments - Asset and Liability Management Derivative Positions of Company (Parenthetical) (Detail) - Asset and Liability Management Positions [Member] - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Derivative [Line Items]
Notional Value, Assets	$ 65,519	$ 64,041
Notional Value, Liabilities	44,695	54,020
Fair Value, Liabilities	448	548
Swap [Member] | Visa Class B Shares [Member]
Derivative [Line Items]
Notional Value, Liabilities	1,800	1,800
Fair Value, Liabilities	$ 154	$ 182
Derivative Liability Average Remaining Maturity Period	2 years 3 days	2 years 6 months
Underwriting Purchase and Sale Commitments [Member]
Derivative [Line Items]
Notional Value, Assets	$ 951	$ 47
Notional Value, Liabilities	$ 951	$ 47