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Derivative And Credit-Related Financial Instruments (Narrative) (Details) - USD ($) shares in Thousands, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Credit Derivatives [Line Items] |  |  |  |  |
Cash received as collateral for derivative assets | $ 219 |  | $ 219 |  |
Fair value of securities pledged as collateral for derivative assets | 1 |  | 1 |  |
Cash posted as collateral for derivative liabilities | 14 |  | 14 |  |
Net cash flow hedge income (loss) included in interest and fees on loans | (150) | $ 25 | (269) | $ 47 |
Price alignment income | 7 |  | 15 |  |
Net gain (loss) on open foreign currency positions | (1) | $ 0 | (1) | $ 0 |
Allowance for credit losses on lending-related commitments | 44 |  | 44 |  | $ 51
Allowance for credit losses on lending-related commitments, amount related to unused commitments to extend credit | 42 |  | 42 |  | 44
Risk participation agreements covering standby and commercial letters of credit | 91 |  | 91 |  | 107
Standby and commercial letters of credit | 3,600 |  | 3,600 |  | 3,800
Carrying value of standby and commercial letters of credit included in accrued expenses and other liabilities | 35 |  | 35 |  | 35
Deferred fees on standby and commercial letters of credit included in accrued expenses and other liabilities | 33 |  | 33 |  | 28
Allowance for credit losses on lending-related commitments, amount related to standby and commercial letters of credit | 2 |  | 2 |  | 7
Notional amount of derivative credit risk participation agreements | $ 949 |  | $ 949 |  | 951
Weighted average remaining maturity of credit risk participation agreements (in years) |  |  | 4 years 1 month 6 days |  |
Other financial derivative liabilities | Visa Class B |  |  |  |  |
Credit Derivatives [Line Items] |  |  |  |  |
Derivative, underlying investment (in shares) | 780 |  | 780 |  |
Recurring |  |  |  |  |
Credit Derivatives [Line Items] |  |  |  |  |
Fair value of derivative liability | $ 1,601 |  | $ 1,601 |  | 1,799
Level 3 | Recurring |  |  |  |  |
Credit Derivatives [Line Items] |  |  |  |  |
Fair value of derivative liability | 14 |  | 14 |  | 12
Level 3 | Recurring | Other financial derivative liabilities |  |  |  |  |
Credit Derivatives [Line Items] |  |  |  |  |
Fair value of derivative liability | $ 14 |  | $ 14 |  | $ 12

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