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Derivative And Credit-Related Financial Instruments (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]      
Cash received as collateral for derivative assets $ 143,000,000    
Fair value of securities pledged as collateral for derivative assets 4,000,000    
Cash posted as collateral for derivative liabilities 14,000,000    
Net cash flow hedge income (loss) included in interest and fees on loans (602,000,000) $ (25,000,000) $ 95,000,000
De-designated interest swaps 7,000,000,000    
Swap Settlements 29,000,000    
Price alignment income 51,000,000 8,000,000  
Allowance for credit losses on lending-related commitments 40,000,000 51,000,000  
Allowance for credit losses on lending-related commitments, amount related to standby and commercial letters of credit $ 38,000,000 44,000,000  
Final year of expiration for outstanding letters of credit 2033    
Risk participation agreements covering standby and commercial letters of credit $ 85,000,000 107,000,000  
Net gain on open foreign currency positions 0    
Standby and commercial letters of credit outstanding 3,600,000,000 3,800,000,000  
Carrying value of standby and commercial letters of credit included in accrued expenses and other liabilities 34,000,000 35,000,000  
Deferred fees on standby and commercial letters of credit included in accrued expenses and other liabilities 32,000,000 28,000,000  
Allowance for credit losses on lending-related commitments, unused commitments to extend credit 2,000,000 7,000,000  
Notional Amount of Derivative Credit Risk Participation Agreements 1,000,000,000 951,000,000  
Maximum estimated exposure to credit risk participation agreements assuming 100% default $ 1,874,123 $ 158,590.98000000  
Weighted average remaining maturity of credit risk participation agreements, in years 4 years 1 month 6 days