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Derivative And Credit-Related Financial Instruments (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash received as collateral for derivative assets $ 18    
Fair value of securities pledged as collateral for derivative assets 54    
Cash posted as collateral for derivative liabilities 494    
Net cash flow hedge gains included in interest and fees on loans 95 $ 70 $ 0
Interest rate swap agreement maturity 500    
Fixed interest rate swaps 3,000    
Net gain on open foreign currency positions 0 0 $ 0
Allowance for credit losses on lending-related commitments 30 44  
Allowance for credit losses on lending-related commitments, amount related to standby and commercial letters of credit $ 27 37  
Final year of expiration for outstanding letters of credit 2028    
Risk participation agreements covering standby and commercial letters of credit $ 98 150  
Standby and commercial letters of credit outstanding 3,400 3,300  
Carrying value of standby and commercial letters of credit included in accrued expenses and other liabilities 32 37  
Deferred fees on standby and commercial letters of credit included in accrued expenses and other liabilities 29 30  
Allowance for credit losses on lending-related commitments, unused commitments to extend credit 3 7  
Notional Amount of Derivative Credit Risk Participation Agreements 1,100 1,100  
Fair Value Amount of Derivative Credit Risk Participation Agreements 1 3  
Maximum estimated exposure to credit risk participation agreements assuming 100% default $ 30 62  
Weighted average remaining maturity of credit risk participation agreements, in years 4 years 2 months 12 days    
Recurring      
Total liabilities at fair value $ 873 347  
Level 3 | Recurring      
Total liabilities at fair value $ 13 $ 11