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Derivative And Credit-Related Financial Instruments (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Cash received as collateral for derivative assets | $ 196 |  | $ 196 |  |
Fair value of securities pledged as collateral for derivative assets | 127 |  | 127 |  |
Cash posted as collateral for derivative liabilities | 280 |  | 280 |  |
Net cash flow hedge gains included in interest and fees on loans | (2) | $ 24 | 45 | $ 72 |
Allowance for credit losses on lending-related commitments | 48 |  | 48 |  | $ 30
Allowance for credit losses on lending-related commitments, amount related to unused commitments to extend credit | 44 |  | $ 44 |  | 27
Final year of expiration for outstanding letters of credit |  |  | 2028 |  |
Risk participation agreements covering standby and commercial letters of credit | 110 |  | $ 110 |  | 98
Standby and commercial letters of credit | 3,400 |  | 3,400 |  | 3,400
Carrying value of standby and commercial letters of credit included in accrued expenses and other liabilities | 32 |  | 32 |  | 32
Deferred fees on standby and commercial letters of credit included in accrued expenses and other liabilities | 28 |  | 28 |  | 29
Allowance for credit losses on lending-related commitments, amount related to standby and commercial letters of credit | 4 |  | 4 |  | 3
Notional amount of derivative credit risk participation agreements | 894 |  | $ 894 |  | 1,100
Fair Value Amount of Derivative Credit Risk Participation Agreements |  |  |  |  | 1
Maximum estimated exposure to credit risk participation agreements assuming 100% default |  |  |  |  | 30
Weighted average remaining maturity of credit risk participation agreements, in years |  |  | 3 years 10 months 24 days |  |
Recurring |  |  |  |  |
Total liabilities at fair value | 2,230 |  | $ 2,230 |  | 873
Level 3 | Recurring |  |  |  |  |
Total liabilities at fair value | $ 12 |  | $ 12 |  | $ 13

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