v3.25.4
Fair Value Hierarchy - Schedule of Trading Cash Instruments by Level (Detail) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Trading cash instruments assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value $ 603,843 $ 523,216
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 416,913 355,542
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 186,026 166,461
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 904 1,213
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 231,613 236,079
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 158,405 169,121
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 73,208 66,958
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 103,898 69,539
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 67,538 44,427
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 36,349 25,071
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 11 41
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 1,722 1,488
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 1,659 1,450
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 63 38
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 12,776 11,421
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 12,684 11,364
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 92 57
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 51,218 47,639
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 213 172
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 50,521 46,739
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 484 728
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 379 529
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 377 529
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 2 0
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 5,150 2,332
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 1,526 1
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 3,534 2,236
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 90 95
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 190,986 143,206
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 189,231 141,821
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 1,593 1,143
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 162 242
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 6,101 10,983
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 6,101 10,971
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 12
Trading cash instruments liabilities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value (178,147) (127,575)
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 (140,536) (100,250)
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 (37,492) (27,250)
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 (119) (75)
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 (23,187) (21,233)
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 (23,172) (21,181)
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 (15) (52)
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 (53,645) (40,752)
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 (49,628) (37,466)
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 (4,014) (3,283)
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 (41) (33)
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 (41) (32)
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 (1)
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 (18) (20)
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 (18) (20)
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 (33,005) (23,882)
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 (307) (75)
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 (32,597) (23,755)
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 (101) (52)
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 (133) (72)
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 (133) (72)
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 (67,446) (41,559)
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 (67,429) (41,528)
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 (2) (12)
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 (15) (19)
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 (672) (24)
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 (672) (24)
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