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Commitments, Contingencies and Guarantees (Tables) | 3 Months Ended
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Mar. 31, 2025
Commitments and Contingencies Disclosure [Abstract] |
Credit Risk Of Off- Balance Sheet Financial Instruments By Contractual Amounts |
| March 31, 2025 |  | December 31, 2024
| (In millions)
Unused commitments to extend credit | $ | 64,347 |  |  | $ | 63,232 |
Standby letters of credit | 2,140 |  |  | 2,096 |
Commercial letters of credit | 68 |  |  | 58 |
Liabilities associated with standby letters of credit | 34 |  |  | 33 |
Assets associated with standby letters of credit | 36 |  |  | 35 |
Reserve for unfunded credit commitments | 117 |  | 116 |

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