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Derivative And Credit-Related Financial Instruments (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Cash received as collateral for derivative assets $ 185    
Fair value of securities pledged as collateral for derivative assets 202    
Cash posted as collateral for derivative liabilities 4    
Net cash flow hedge gains included in interest and fees on loans (25) $ 95 $ 70
Price alignment income 8    
Net gain on open foreign currency positions 0 0 $ 0
Allowance for credit losses on lending-related commitments 51 30  
Allowance for credit losses on lending-related commitments, unused commitments to extend credit $ 44 27  
Final year of expiration for outstanding letters of credit 2029    
Risk participation agreements covering standby and commercial letters of credit $ 107 98  
Standby and commercial letters of credit outstanding 3,800 3,400  
Carrying value of standby and commercial letters of credit included in accrued expenses and other liabilities 35 32  
Deferred fees on standby and commercial letters of credit included in accrued expenses and other liabilities 28 29  
Allowance for credit losses on lending-related commitments, amount related to standby and commercial letters of credit 7 3  
Notional Amount of Derivative Credit Risk Participation Agreements $ 951 1,100  
Fair Value Amount of Derivative Credit Risk Participation Agreements   1  
Maximum estimated exposure to credit risk participation agreements assuming 100% default   30  
Weighted average remaining maturity of credit risk participation agreements, in years 3 years 9 months 18 days    
Recurring      
Total liabilities at fair value $ 1,799 873  
Level 3 | Recurring      
Total liabilities at fair value $ 12 $ 13