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Fair Value Hierarchy - Loans, Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair value option gains/(losses) $ (4,787) $ (5,310) $ (11,016) $ (7,783)
Other principal transactions        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair value option gains/(losses) (12) 75 75 53
Level 3        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net realized gains/(losses) 2 (18) 32 (8)
Level 3 | Other principal transactions        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net realized gains/(losses) (2) 9 10 (2)
Level 3 | Interest income        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net realized gains/(losses) $ 4 $ 9 $ 22 $ 10