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Fair Values of Assets and Liabilities - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Changes in debit valuation adjustments | $ (5) | $ 0 | $ (8) | $ 0 |
Carrying value of unfunded commitments, deferred non-yield related loan fees and standby letters of credit | 374 |  | 374 |  | $ 376
Other guarantees carrying value | 179 |  | $ 179 |  | $ 194
Minimum |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Credit valuation adjustment as percentage of derivative contract fair value |  |  | 0.00% |  |
Maximum |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Credit valuation adjustment as percentage of derivative contract fair value |  |  | 248.00% |  |
Weighted Average |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Credit valuation adjustment as percentage of derivative contract fair value |  |  | 2.00% |  |
Mortgage Loans Held For Sale | Level 2 |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Net gains (losses) where the fair value option is elected | 18 | 26 | $ 24 | 22 |
Time Deposits | Level 2 | Interest Expense |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Net gains (losses) where the fair value option is elected | (7) | $ (13) | (6) | $ (2) |
Long-Term Debt, Interest Expense | Level 2 |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Net gains (losses) where the fair value option is elected | $ (1) |  | 1 |  |
Changes in debit valuation adjustments |  |  | $ (8) |  |

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