Commitments, Contingencies and Guarantees (Credit Risk Of Financial Instruments By Contractual Amounts) (Details) - USD ($) $ in Millions |
Mar. 31, 2026 |
Dec. 31, 2025 |
Mar. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|---|---|
| Commitments and Contingencies Disclosure [Abstract] | ||||
| Unused commitments to extend credit | $ 68,671 | $ 68,237 | ||
| Standby letters of credit | 2,332 | 2,283 | ||
| Commercial letters of credit | 55 | 97 | ||
| Liabilities associated with standby letters of credit | 34 | 34 | ||
| Assets associated with standby letters of credit | 36 | 36 | ||
| Reserve for unfunded credit commitments | $ 120 | $ 130 | $ 117 | $ 116 |