Commitments, Contingencies and Guarantees (Credit Risk Of Financial Instruments By Contractual Amounts) (Details) - USD ($) $ in Millions |
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
|---|---|---|---|---|
| Other Commitments [Line Items] | ||||
| 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 | $ 95 | $ 126 |