Derivative Financial Instruments - Notional Value of Derivative Contracts (Detail) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Derivative [Line Items]
Total	$ 1,303,261	$ 1,301,082
Interest rate contracts
Derivative [Line Items]
Total	125,673	122,702
Futures and forwards
Derivative [Line Items]
Total	9,741	5,143
Swaps
Derivative [Line Items]
Total	109,096	114,947
Options written
Derivative [Line Items]
Total	3,452	1,260
Options purchased
Derivative [Line Items]
Total	3,384	1,352
Foreign exchange contracts
Derivative [Line Items]
Total	1,111,524	1,096,967
Swaps, futures and forwards
Derivative [Line Items]
Total	1,004,747	1,005,683
Options written
Derivative [Line Items]
Total	29,926	30,755
Options purchased
Derivative [Line Items]
Total	30,642	30,898
Spot
Derivative [Line Items]
Total	46,209	29,631
Total commodities, equities and precious metals
Derivative [Line Items]
Total	48,610	63,287
Swaps, futures and forwards
Derivative [Line Items]
Total	39,555	53,110
Options written
Derivative [Line Items]
Total	1,339	1,713
Options purchased
Derivative [Line Items]
Total	7,716	8,464
Credit derivatives
Derivative [Line Items]
Total	15,937	16,710
Other Contracts
Derivative [Line Items]
Total	$ 1,517	$ 1,416