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Derivative And Credit-Related Financial Instruments (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2024
Credit Derivatives [Line Items]        
Cash received as collateral for derivative assets $ 71      
Fair value of securities pledged as collateral for derivative assets 125      
Cash posted as collateral for derivative liabilities 17      
Net cash flow hedge income (loss) included in interest and fees on loans (78) $ (170)    
De-designated Interest swaps 7,000      
Total Impact to risk management hedging income (130)      
Impact to risk management hedging income (39)   $ (91)  
Amortized - probable cashflows in OCI 0 (52)    
Amoritized Off Market Element 28 41    
Gain/Loss on cash flow hedge de-designation 21 27    
Price alignment income 8 13    
Allowance for credit losses on lending-related commitments 36     $ 35
Allowance for credit losses on lending-related commitments, amount related to unused commitments to extend credit 32     30
Risk participation agreements covering standby and commercial letters of credit 220     223
Standby and commercial letters of credit 4,200      
Carrying value of standby and commercial letters of credit included in accrued expenses and other liabilities 31     34
Deferred fees on standby and commercial letters of credit included in accrued expenses and other liabilities 27     29
Allowance for credit losses on lending-related commitments, amount related to standby and commercial letters of credit 4     5
Notional amount of derivative credit risk participation agreements 1,000     1,100
Maximum estimated exposure to credit risk participation agreements assuming 100% default $ 5     1
Time to maturity (in years) 4 years 1 month 6 days      
Noninterest income $ 254 $ 236    
Recurring        
Credit Derivatives [Line Items]        
Fair value of derivative liability 943     891
Level 3 | Recurring        
Credit Derivatives [Line Items]        
Fair value of derivative liability 8     6
Level 3 | Recurring | Other financial derivative liabilities        
Credit Derivatives [Line Items]        
Fair value of derivative liability $ 8     $ 6