v3.26.1
Fair Value Hierarchy - Schedule of Trading Cash Instruments by Level (Detail) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Trading cash instruments assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value $ 693,966 $ 603,843
Trading cash instruments assets | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 510,063 416,913
Trading cash instruments assets | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 182,698 186,026
Trading cash instruments assets | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 1,205 904
Trading cash instruments assets | U.S. government and agency obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 246,066 231,613
Trading cash instruments assets | U.S. government and agency obligations | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 187,135 158,405
Trading cash instruments assets | U.S. government and agency obligations | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 58,931 73,208
Trading cash instruments assets | U.S. government and agency obligations | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 0 0
Trading cash instruments assets | Non-U.S. government obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 139,951 103,898
Trading cash instruments assets | Non-U.S. government obligations | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 102,380 67,538
Trading cash instruments assets | Non-U.S. government obligations | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 37,537 36,349
Trading cash instruments assets | Non-U.S. government obligations | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 34 11
Trading cash instruments assets | Commercial real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 1,448 1,722
Trading cash instruments assets | Commercial real estate | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 0 0
Trading cash instruments assets | Commercial real estate | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 1,366 1,659
Trading cash instruments assets | Commercial real estate | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 82 63
Trading cash instruments assets | Residential real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 10,871 12,776
Trading cash instruments assets | Residential real estate | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 0 0
Trading cash instruments assets | Residential real estate | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 10,786 12,684
Trading cash instruments assets | Residential real estate | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 85 92
Trading cash instruments assets | Corporate debt instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 61,450 51,218
Trading cash instruments assets | Corporate debt instruments | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 100 213
Trading cash instruments assets | Corporate debt instruments | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 60,614 50,521
Trading cash instruments assets | Corporate debt instruments | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 736 484
Trading cash instruments assets | State and municipal obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 573 379
Trading cash instruments assets | State and municipal obligations | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 0 0
Trading cash instruments assets | State and municipal obligations | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 573 377
Trading cash instruments assets | State and municipal obligations | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 0 2
Trading cash instruments assets | Other debt obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 8,418 5,150
Trading cash instruments assets | Other debt obligations | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 102 1,526
Trading cash instruments assets | Other debt obligations | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 8,224 3,534
Trading cash instruments assets | Other debt obligations | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 92 90
Trading cash instruments assets | Equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 222,250 190,986
Trading cash instruments assets | Equity securities | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 220,346 189,231
Trading cash instruments assets | Equity securities | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 1,728 1,593
Trading cash instruments assets | Equity securities | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 176 162
Trading cash instruments assets | Commodities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 2,939 6,101
Trading cash instruments assets | Commodities | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 0 0
Trading cash instruments assets | Commodities | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 2,939 6,101
Trading cash instruments assets | Commodities | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 0 0
Trading cash instruments liabilities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value (222,020) (178,147)
Trading cash instruments liabilities | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value (174,847) (140,536)
Trading cash instruments liabilities | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value (47,114) (37,492)
Trading cash instruments liabilities | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value (59) (119)
Trading cash instruments liabilities | U.S. government and agency obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value (35,060) (23,187)
Trading cash instruments liabilities | U.S. government and agency obligations | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value (35,040) (23,172)
Trading cash instruments liabilities | U.S. government and agency obligations | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value (20) (15)
Trading cash instruments liabilities | U.S. government and agency obligations | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value 0 0
Trading cash instruments liabilities | Non-U.S. government obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value (68,881) (53,645)
Trading cash instruments liabilities | Non-U.S. government obligations | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value (63,331) (49,628)
Trading cash instruments liabilities | Non-U.S. government obligations | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value (5,547) (4,014)
Trading cash instruments liabilities | Non-U.S. government obligations | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value (3) (3)
Trading cash instruments liabilities | Commercial real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value (34) (41)
Trading cash instruments liabilities | Commercial real estate | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value 0 0
Trading cash instruments liabilities | Commercial real estate | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value (34) (41)
Trading cash instruments liabilities | Commercial real estate | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value 0 0
Trading cash instruments liabilities | Residential real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value (35) (18)
Trading cash instruments liabilities | Residential real estate | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value 0 0
Trading cash instruments liabilities | Residential real estate | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value (35) (18)
Trading cash instruments liabilities | Residential real estate | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value 0 0
Trading cash instruments liabilities | Corporate debt instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value (41,080) (33,005)
Trading cash instruments liabilities | Corporate debt instruments | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value (1) (307)
Trading cash instruments liabilities | Corporate debt instruments | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value (41,032) (32,597)
Trading cash instruments liabilities | Corporate debt instruments | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value (47) (101)
Trading cash instruments liabilities | Other debt obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value (32) (133)
Trading cash instruments liabilities | Other debt obligations | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value 0 0
Trading cash instruments liabilities | Other debt obligations | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value (32) (133)
Trading cash instruments liabilities | Other debt obligations | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value 0 0
Trading cash instruments liabilities | Equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value (76,502) (67,446)
Trading cash instruments liabilities | Equity securities | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value (76,475) (67,429)
Trading cash instruments liabilities | Equity securities | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value (18) (2)
Trading cash instruments liabilities | Equity securities | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value (9) (15)
Trading cash instruments liabilities | Commodities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value (396) (672)
Trading cash instruments liabilities | Commodities | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value 0 0
Trading cash instruments liabilities | Commodities | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value (396) (672)
Trading cash instruments liabilities | Commodities | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value $ 0 $ 0