Derivative Financial Instruments - Notional Value of Derivative Contracts (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Total	$ 1,395,345	$ 2,021,133
Interest rate contracts
Derivative [Line Items]
Total	246,092	509,403
Futures and forwards
Derivative [Line Items]
Total	44,686	37,098
Swaps
Derivative [Line Items]
Total	177,876	406,609
Options written
Derivative [Line Items]
Total	10,842	33,269
Options purchased
Derivative [Line Items]
Total	12,688	32,427
Foreign exchange contracts
Derivative [Line Items]
Total	1,063,299	1,359,284
Swaps, futures and forwards
Derivative [Line Items]
Total	974,725	1,195,449
Options written
Derivative [Line Items]
Total	28,577	53,200
Options purchased
Derivative [Line Items]
Total	28,678	53,595
Spot
Derivative [Line Items]
Total	31,319	57,040
Total commodities, equities and precious metals
Derivative [Line Items]
Total	77,727	98,619
Swaps, futures and forwards
Derivative [Line Items]
Total	60,054	54,458
Options written
Derivative [Line Items]
Total	5,873	17,078
Options purchased
Derivative [Line Items]
Total	11,800	27,083
Credit contracts
Derivative [Line Items]
Total	7,023	52,611
Other Contracts
Derivative [Line Items]
Total	$ 1,204	$ 1,216