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Derivative And Credit-Related Financial Instruments (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]          
Cash received as collateral for derivative assets     $ 85    
Fair value of securities pledged as collateral for derivative assets     (2)    
Other Comprehensive Income (Loss), before Reclassifications, before Tax       $ (602) $ (25)
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     (177)    
Amoritized Off Market Element     170    
Price alignment income   51 46 51 $ 8
Allowance for credit losses on lending-related commitments   40 35 40  
Allowance for credit losses on lending-related commitments, amount related to standby and commercial letters of credit   38 $ 30 38  
Final year of expiration for outstanding letters of credit     2035    
Risk participation agreements covering standby and commercial letters of credit   85 $ 223 85  
Standby and commercial letters of credit outstanding   3,600 4,200 3,600  
Carrying value of standby and commercial letters of credit included in accrued expenses and other liabilities   34 34 34  
Deferred fees on standby and commercial letters of credit included in accrued expenses and other liabilities   32 29 32  
Allowance for credit losses on lending-related commitments, unused commitments to extend credit   2 5 2  
Notional Amount of Derivative Credit Risk Participation Agreements   1,000 1,100 1,000  
Maximum estimated exposure to credit risk participation agreements assuming 100% default   $ 2 $ 1 $ 2  
Weighted average remaining maturity of credit risk participation agreements, in years     4 years 7 months 6 days    
Aggregate fair value of all derivative instruments with credit-risk contingent features that were in a liability position     $ 0    
Fair value of securities pledged as collateral for derivative liabilities     $ 143