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Fair Value Hierarchy - Financial Assets and Financial Liabilities by Level (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Resale agreements $ 129,786 $ 179,793
Securities borrowed 48,253 46,902
Customer and other receivables 122 23
Other assets 190 194
Total 178,351 226,912
Deposits (83,146) (44,855)
Repurchase agreements (217,797) (274,380)
Securities loaned (12,837) (10,246)
Other secured financings (24,595) (27,985)
Unsecured borrowings: Short-term (59,524) (50,367)
Unsecured borrowings: Long-term (111,925) (89,189)
Other liabilities (90) (84)
Total financial liabilities at fair value (509,914) (497,106)
Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Resale agreements 0 0
Securities borrowed 0 0
Customer and other receivables 0 0
Other assets 0 0
Total 0 0
Deposits 0 0
Repurchase agreements 0 0
Securities loaned 0 0
Other secured financings 0 0
Unsecured borrowings: Short-term 0 0
Unsecured borrowings: Long-term 0 0
Other liabilities 0 0
Total financial liabilities at fair value 0 0
Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Resale agreements 129,786 179,793
Securities borrowed 48,253 46,902
Customer and other receivables 122 23
Other assets 0 0
Total 178,161 226,718
Deposits (79,947) (41,810)
Repurchase agreements (217,797) (274,380)
Securities loaned (12,837) (10,246)
Other secured financings (23,907) (27,434)
Unsecured borrowings: Short-term (52,548) (45,073)
Unsecured borrowings: Long-term (96,597) (75,810)
Other liabilities (8) (8)
Total financial liabilities at fair value (483,641) (474,761)
Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Resale agreements 0 0
Securities borrowed 0 0
Customer and other receivables 0 0
Other assets 190 194
Total 190 194
Deposits (3,199) (3,045)
Repurchase agreements 0 0
Securities loaned 0 0
Other secured financings (688) (551)
Unsecured borrowings: Short-term (6,976) (5,294)
Unsecured borrowings: Long-term (15,328) (13,379)
Other liabilities (82) (76)
Total financial liabilities at fair value $ (26,273) $ (22,345)