Commitments, Contingencies and Guarantees (Credit Risk Of Financial Instruments By Contractual Amounts) (Details) - USD ($) $ in Millions |
Mar. 31, 2025 |
Dec. 31, 2024 |
Mar. 31, 2024 |
Dec. 31, 2023 |
|---|---|---|---|---|
| Commitments and Contingencies Disclosure [Abstract] | ||||
| 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 | $ 114 | $ 124 |