v3.26.1
Fair Value Hierarchy - Schedule of Trading Cash Instruments by Level (Detail) - USD ($)
$ in Millions
Jun. 30, 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 $ 723,911 $ 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 547,663 416,913
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 175,115 186,026
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 1,133 904
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 250,066 231,613
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 197,729 158,405
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 52,337 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 140,017 103,898
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 102,596 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 37,404 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 17 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 1,483 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 1,428 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 55 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 10,421 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 10,373 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 48 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 61,462 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 429 213
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 60,309 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 724 484
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 887 379
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 887 377
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 10,400 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 1,620 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 8,689 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 91 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 247,166 190,986
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 245,289 189,231
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 1,679 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 198 162
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 2,009 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 2,009 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 (223,810) (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 (175,514) (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 (48,178) (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 (118) (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 (32,656) (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 (32,550) (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 (106) (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 (58,296) (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 (53,501) (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 (4,792) (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 (32) (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 (32) (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 (40,923) (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 (135) (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 (40,679) (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 (109) (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 (2) (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 (2) (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 (89,648) (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 (89,328) (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 (314) (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 (6) (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 (2,219) (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 (2,219) (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