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Fair Value Hierarchy - Schedule of Trading Cash Instruments by Level (Detail) - USD ($)
$ in Millions
Sep. 30, 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 $ 600,320 $ 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 411,574 355,542
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 187,661 166,461
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 1,085 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 217,926 236,079
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 142,098 169,121
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 75,828 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 and agency obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument assets at fair value 119,424 69,539
Trading cash instruments assets | Non-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 81,737 44,427
Trading cash instruments assets | Non-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 37,667 25,071
Trading cash instruments assets | Non-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 20 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 1,509 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 1,416 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 93 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 10,671 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 10,616 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 55 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 50,672 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 206 172
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 49,819 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 647 728
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 1,012 529
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 1,012 529
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 0 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 4,398 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 632 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 3,656 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 110 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 188,701 143,206
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 186,901 141,821
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 1,640 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 160 242
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 6,007 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 6,007 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 (182,285) (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 (145,898) (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 (36,146) (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 (241) (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 (24,261) (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 (24,258) (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 (3) (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 and agency obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading cash instrument liabilities at fair value (59,564) (40,752)
Trading cash instruments liabilities | Non-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 (55,428) (37,466)
Trading cash instruments liabilities | Non-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 (4,133) (3,283)
Trading cash instruments liabilities | Non-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 (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) (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 (34) (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 (9) (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 (9) (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 (32,317) (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 (191) (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 (31,940) (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 (186) (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   (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
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   (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
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 (66,082) (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 (66,021) (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 (9) (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 (52) (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 (18) (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 (18) (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