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Derivative And Credit-Related Financial Instruments (Narrative) (Details) - USD ($)
shares in Thousands, $ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Cash received as collateral for derivative assets $ 268    
Fair value of securities pledged as collateral for derivative assets 18    
Cash posted as collateral for derivative liabilities 5    
Net cash flow hedge income (loss) included in interest and fees on loans (119) $ 22  
Price alignment income 8 $ 0  
Allowance for credit losses on lending-related commitments 52   $ 51
Allowance for credit losses on lending-related commitments, amount related to unused commitments to extend credit $ 49   44
Final year of expiration for outstanding letters of credit 2033    
Risk participation agreements covering standby and commercial letters of credit $ 95   107
Standby and commercial letters of credit 3,600   3,800
Carrying value of standby and commercial letters of credit included in accrued expenses and other liabilities 34   35
Deferred fees on standby and commercial letters of credit included in accrued expenses and other liabilities 31   28
Allowance for credit losses on lending-related commitments, amount related to standby and commercial letters of credit 3   7
Notional amount of derivative credit risk participation agreements 864   951
Maximum estimated exposure to credit risk participation agreements assuming 100% default $ 1   0
Weighted average remaining maturity of credit risk participation agreements (in years) 3 years 10 months 24 days    
Other financial derivative | Visa Class B      
Derivative, underlying investment (in shares) 780    
Recurring      
Fair value of derivative liability $ 1,573   1,799
Level 3 | Recurring      
Fair value of derivative liability 12   12
Level 3 | Recurring | Other financial derivative      
Fair value of derivative liability $ 12   $ 12