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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

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