Collateralized Agreements and Financings - Other Secured Financings (Detail) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Other Secured Financings [Line Items]
Other secured financings (short-term)	$ 25,296	$ 17,309
Other secured financings (long-term)	11,040	10,712
Total other secured financings	36,336	28,021
Other secured financings collateralized by: Financial instruments	32,878	25,542
Other secured financings collateralized by: Other assets	3,458	2,479
Other secured financings at fair value	36,139	27,833
U.S. Dollar
Other Secured Financings [Line Items]
Other secured financings (short-term)	18,916	12,152
Other secured financings (long-term)	2,477	2,618
Total other secured financings	21,393	14,770
Other secured financings collateralized by: Financial instruments	21,003	14,461
Other secured financings collateralized by: Other assets	390	309
Non-U.S. Dollar
Other Secured Financings [Line Items]
Other secured financings (short-term)	6,380	5,157
Other secured financings (long-term)	8,563	8,094
Total other secured financings	14,943	13,251
Other secured financings collateralized by: Financial instruments	11,875	11,081
Other secured financings collateralized by: Other assets	$ 3,068	$ 2,170