Derivative Financial Instruments - Notional Value of Derivative Contracts (Detail) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Derivative [Line Items]
Total	$ 1,443,913	$ 1,307,707
Interest rate contracts
Derivative [Line Items]
Total	163,043	123,726
Futures and forwards
Derivative [Line Items]
Total	35,454	16,829
Swaps
Derivative [Line Items]
Total	126,363	104,458
Options written
Derivative [Line Items]
Total	626	1,217
Options purchased
Derivative [Line Items]
Total	600	1,222
Foreign exchange contracts
Derivative [Line Items]
Total	1,211,280	1,118,248
Swaps, futures and forwards
Derivative [Line Items]
Total	1,080,229	1,026,047
Options written
Derivative [Line Items]
Total	39,200	29,739
Options purchased
Derivative [Line Items]
Total	39,215	29,859
Spot
Derivative [Line Items]
Total	52,636	32,603
Total commodities, equities and precious metals
Derivative [Line Items]
Total	44,322	44,888
Swaps, futures and forwards
Derivative [Line Items]
Total	31,287	33,520
Options written
Derivative [Line Items]
Total	1,950	1,513
Options purchased
Derivative [Line Items]
Total	11,085	9,855
Credit derivatives
Derivative [Line Items]
Total	23,402	19,175
Other Contracts
Derivative [Line Items]
Total	$ 1,866	$ 1,670