Collateralized Agreements and Financings - Other Secured Financings (Detail) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Other Secured Financings [Line Items]
Other secured financings (short-term)	$ 23,523	$ 17,309
Other secured financings (long-term)	11,558	10,712
Total other secured financings	35,081	28,021
Other secured financings collateralized by: Financial instruments	31,944	25,542
Other secured financings collateralized by: Other assets	3,137	2,479
Other secured financings at fair value	34,865	27,833
U.S. Dollar
Other Secured Financings [Line Items]
Other secured financings (short-term)	16,445	12,152
Other secured financings (long-term)	3,085	2,618
Total other secured financings	19,530	14,770
Other secured financings collateralized by: Financial instruments	17,884	14,461
Other secured financings collateralized by: Other assets	1,646	309
Non-U.S. Dollar
Other Secured Financings [Line Items]
Other secured financings (short-term)	7,078	5,157
Other secured financings (long-term)	8,473	8,094
Total other secured financings	15,551	13,251
Other secured financings collateralized by: Financial instruments	14,060	11,081
Other secured financings collateralized by: Other assets	$ 1,491	$ 2,170