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Derivative And Credit-Related Financial Instruments (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Cash received as collateral for derivative assets | $ 18 |  |
Fair value of securities pledged as collateral for derivative assets | 54 |  |
Cash posted as collateral for derivative liabilities | 494 |  |
Net cash flow hedge gains included in interest and fees on loans | 95 | $ 70 | $ 0
Interest rate swap agreement maturity | 500 |  |
Fixed interest rate swaps | 3,000 |  |
Net gain on open foreign currency positions | 0 | 0 | $ 0
Allowance for credit losses on lending-related commitments | 30 | 44 |
Allowance for credit losses on lending-related commitments, amount related to standby and commercial letters of credit | $ 27 | 37 |
Final year of expiration for outstanding letters of credit | 2028 |  |
Risk participation agreements covering standby and commercial letters of credit | $ 98 | 150 |
Standby and commercial letters of credit outstanding | 3,400 | 3,300 |
Carrying value of standby and commercial letters of credit included in accrued expenses and other liabilities | 32 | 37 |
Deferred fees on standby and commercial letters of credit included in accrued expenses and other liabilities | 29 | 30 |
Allowance for credit losses on lending-related commitments, unused commitments to extend credit | 3 | 7 |
Notional Amount of Derivative Credit Risk Participation Agreements | 1,100 | 1,100 |
Fair Value Amount of Derivative Credit Risk Participation Agreements | 1 | 3 |
Maximum estimated exposure to credit risk participation agreements assuming 100% default | $ 30 | 62 |
Weighted average remaining maturity of credit risk participation agreements, in years | 4 years 2 months 12 days |  |
Recurring |  |  |
Total liabilities at fair value | $ 873 | 347 |
Level 3 | Recurring |  |  |
Total liabilities at fair value | $ 13 | $ 11 |

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