Derivative Financial Instruments - Notional Value of Derivative Contracts (Detail) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Derivative [Line Items]
Total	$ 1,305,154	$ 1,307,707
Interest rate contracts
Derivative [Line Items]
Total	152,840	123,726
Futures and forwards
Derivative [Line Items]
Total	39,170	16,829
Swaps
Derivative [Line Items]
Total	112,409	104,458
Options written
Derivative [Line Items]
Total	667	1,217
Options purchased
Derivative [Line Items]
Total	594	1,222
Foreign exchange contracts
Derivative [Line Items]
Total	1,084,599	1,118,248
Swaps, futures and forwards
Derivative [Line Items]
Total	959,521	1,026,047
Options written
Derivative [Line Items]
Total	37,986	29,739
Options purchased
Derivative [Line Items]
Total	38,048	29,859
Spot
Derivative [Line Items]
Total	49,044	32,603
Total commodities, equities and precious metals
Derivative [Line Items]
Total	45,231	44,888
Swaps, futures and forwards
Derivative [Line Items]
Total	33,195	33,520
Options written
Derivative [Line Items]
Total	1,649	1,513
Options purchased
Derivative [Line Items]
Total	10,387	9,855
Credit derivatives
Derivative [Line Items]
Total	20,643	19,175
Other Contracts
Derivative [Line Items]
Total	$ 1,841	$ 1,670