Commitments, Contingencies and Guarantees (Credit Risk Of Financial Instruments By Contractual Amounts) (Details) - USD ($) $ in Millions |
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|---|---|---|---|---|
| Other Commitments [Line Items] | ||||
| Unused commitments to extend credit | $ 60,935 | $ 56,644 | ||
| Standby letters of credit | 1,779 | 1,742 | ||
| Commercial letters of credit | 97 | 132 | ||
| Liabilities associated with standby letters of credit | 28 | 25 | ||
| Assets associated with standby letters of credit | 29 | 25 | ||
| Reserve for unfunded credit commitments | $ 95 | $ 126 | $ 45 | $ 51 |