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Derivative And Credit-Related Financial Instruments (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Cash received as collateral for derivative assets | $ 137 |  | $ 137 |  |
Fair value of securities pledged as collateral for derivative assets | 210 |  | 210 |  |
Cash posted as collateral for derivative liabilities | 1,300 |  | 1,300 |  |
Net cash flow hedge gains included in interest and fees on loans | 25 | $ 24 | 47 | $ 48 |
Allowance for credit losses on lending-related commitments | 46 |  | 46 |  | $ 30
Allowance for credit losses on lending-related commitments, amount related to unused commitments to extend credit | 39 |  | $ 39 |  | 27
Final year of expiration for outstanding letters of credit |  |  | 2028 |  |
Risk participation agreements covering standby and commercial letters of credit | 105 |  | $ 105 |  | 98
Standby and commercial letters of credit | 3,500 |  | 3,500 |  | 3,400
Carrying value of standby and commercial letters of credit included in accrued expenses and other liabilities | 36 |  | 36 |  | 32
Deferred fees on standby and commercial letters of credit included in accrued expenses and other liabilities | 29 |  | 29 |  | 29
Allowance for credit losses on lending-related commitments, amount related to standby and commercial letters of credit | 7 |  | 7 |  | 3
Notional amount of derivative credit risk participation agreements | 899 |  | $ 899 |  | 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 |  |  | 4 years |  |
Recurring |  |  |  |  |
Total liabilities at fair value | 2,122 |  | $ 2,122 |  | 873
Level 3 | Recurring |  |  |  |  |
Total liabilities at fair value | $ 12 |  | $ 12 |  | $ 13

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