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Derivative And Credit-Related Financial Instruments (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Cash received as collateral for derivative assets $ 137   $ 137    
Fair value of securities pledged as collateral for derivative assets 210   210    
Cash posted as collateral for derivative liabilities 1,300   1,300    
Net cash flow hedge gains included in interest and fees on loans 25 $ 24 47 $ 48  
Allowance for credit losses on lending-related commitments 46   46   $ 30
Allowance for credit losses on lending-related commitments, amount related to unused commitments to extend credit 39   $ 39   27
Final year of expiration for outstanding letters of credit     2028    
Risk participation agreements covering standby and commercial letters of credit 105   $ 105   98
Standby and commercial letters of credit 3,500   3,500   3,400
Carrying value of standby and commercial letters of credit included in accrued expenses and other liabilities 36   36   32
Deferred fees on standby and commercial letters of credit included in accrued expenses and other liabilities 29   29   29
Allowance for credit losses on lending-related commitments, amount related to standby and commercial letters of credit 7   7   3
Notional amount of derivative credit risk participation agreements 899   $ 899   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     4 years    
Recurring          
Total liabilities at fair value 2,122   $ 2,122   873
Level 3 | Recurring          
Total liabilities at fair value $ 12   $ 12   $ 13