Commitments, Contingencies and Guarantees (Credit Risk Of Financial Instruments By Contractual Amounts) (Details) - USD ($) $ in Millions |
Sep. 30, 2024 |
Jun. 30, 2024 |
Dec. 31, 2023 |
Sep. 30, 2023 |
Jun. 30, 2023 |
Dec. 31, 2022 |
|---|---|---|---|---|---|---|
| Commitments and Contingencies Disclosure [Abstract] | ||||||
| Unused commitments to extend credit | $ 64,642 | $ 63,631 | ||||
| Standby letters of credit | 2,094 | 1,997 | ||||
| Commercial letters of credit | 62 | 78 | ||||
| Liabilities associated with standby letters of credit | 33 | 32 | ||||
| Assets associated with standby letters of credit | 34 | 34 | ||||
| Reserve for unfunded credit commitments | $ 121 | $ 111 | $ 124 | $ 130 | $ 120 | $ 118 |