v3.26.3
Fair Value Measurement - Level 3 Analysis (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Long-term debt          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Transfers from level 3 into level 2, liabilities $ 900 $ 265 $ 2,294 $ 1,387  
Transfers from level 2 into level 3, liabilities 86 198 346 383  
Realized/unrealized gains (losses), liabilities 597 (1,918) (1,869) (4,151)  
Non-U.S. government debt securities          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Transfers from level 3 into level 2, assets 22 2 52 26  
Transfers from level 2 into level 3, assets 3 0 28 54  
Realized/unrealized gains (losses), assets (34) (6) 56 30  
Non-trading loans          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Transfers from level 3 into level 2, assets 211 141 635 471  
Transfers from level 2 into level 3, assets 403 303 1,236 908  
Realized/unrealized gains (losses), assets (1) 24 144 198  
Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets fair value 2,325,045   2,325,045   $ 1,829,852
Recurring | Long-term debt          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Transfers from level 3 into level 2, liabilities 900   2,300 1,400  
Recurring | Derivative receivables          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
(Decrease) increase in level 3 assets     4,500    
Recurring | Non-trading loans          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Transfers from level 3 into level 2, assets       782  
Transfers from level 2 into level 3, assets     1,200 908  
Recurring | Equity | Derivative payables          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Transfers from level 3 into level 2, liabilities   1,200 1,400 2,100  
Transfers from level 2 into level 3, liabilities     1,600 1,200  
Recurring | Equity | Derivative receivables          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Transfers from level 3 into level 2, assets   914 1,500 1,700  
Transfers from level 2 into level 3, assets     1,400 1,100  
Recurring | Interest rate | Derivative payables          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Transfers from level 3 into level 2, liabilities     932    
Transfers from level 2 into level 3, liabilities     789    
Recurring | Interest rate | Derivative receivables          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Transfers from level 3 into level 2, assets     922    
Transfers from level 2 into level 3, assets     845    
Level 3 | Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets fair value 29,645   29,645   $ 25,107
(Decrease) increase in level 3 assets (320)   4,500    
Realized/unrealized gains (losses), assets 1,100 252 6,800 4,300  
Realized/unrealized gains (losses), liabilities $ 345 $ (2,100) $ (2,300) $ (4,700)