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Commitments, Contingencies and Guarantees (Tables) | 12 Months Ended
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Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract] |
Credit Risk Of Off- Balance Sheet Financial Instruments By Contractual Amounts | Credit risk associated with these instruments as of December 31 is represented by the contractual amounts indicated in the following table:
| 2023 |  | 2022
| (In millions)
Unused commitments to extend credit | $ | 63,631 |  |  | $ | 65,460 |
Standby letters of credit | 1,997 |  |  | 1,962 |
Commercial letters of credit | 78 |  |  | 75 |
Liabilities associated with standby letters of credit | 32 |  |  | 35 |
Assets associated with standby letters of credit | 34 |  |  | 37 |
Reserve for unfunded credit commitments | 124 |  | 118 |

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