v3.26.1
Fair Value Hierarchy - Loans, Additional Information (Details) - USD ($)
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value option gains/(losses) $ 2,358,000,000 $ (1,072,000,000)
Loans Receivable    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Net realized gains/(losses) 5,000,000 14,000,000
Net unrealized gains/(losses) (8,000,000) $ 0
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]   Interest income
Trading cash instruments, fair value disclosure    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Net realized gains/(losses) (24,000,000) $ 20,000,000
Net realized gains/(losses) 38,000,000 32,000,000
Net unrealized gains/(losses) (62,000,000) (12,000,000)
Trading cash instruments, fair value disclosure | Interest income    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Net realized gains/(losses) $ 40,000,000 $ 23,000,000
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Interest income Interest income
Trading cash instruments, fair value disclosure | Market making    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Net realized gains/(losses) $ (64,000,000) $ (3,000,000)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Interest income Interest income
Liabilities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Interest income Interest income
Other principal transactions    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value option gains/(losses) $ 0 $ 0
Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Net realized gains/(losses) (3,000,000) 14,000,000
Level 3 | Other principal transactions    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Net realized gains/(losses) (6,000,000) 7,000,000
Level 3 | Interest income    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Net realized gains/(losses) $ 3,000,000 $ 7,000,000