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Derivative And Credit-Related Financial Instruments (Narrative) (Details) - USD ($)
shares in Thousands, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Credit Derivatives [Line Items]          
Cash received as collateral for derivative assets $ 159   $ 159    
Fair value of securities pledged as collateral for derivative assets 207   207    
Cash posted as collateral for derivative liabilities 12   12    
Net cash flow hedge income (loss) included in interest and fees on loans (163) $ (2) (432) $ 45  
Price alignment income 17   32    
Net gain (loss) on open foreign currency positions   $ 1 (1) $ 0  
Allowance for credit losses on lending-related commitments 42   42   $ 51
Allowance for credit losses on lending-related commitments, amount related to unused commitments to extend credit 39   39   44
Risk participation agreements covering standby and commercial letters of credit 89   89   107
Standby and commercial letters of credit 3,600   3,600   3,800
Carrying value of standby and commercial letters of credit included in accrued expenses and other liabilities 34   34   35
Deferred fees on standby and commercial letters of credit included in accrued expenses and other liabilities 31   31   28
Allowance for credit losses on lending-related commitments, amount related to standby and commercial letters of credit 3   3   7
Notional amount of derivative credit risk participation agreements $ 1,000   $ 1,000   951
Weighted average remaining maturity of credit risk participation agreements (in years)     4 years 3 months 18 days    
Other financial derivative liabilities | Visa Class B          
Credit Derivatives [Line Items]          
Derivative, underlying investment (in shares) 780   780    
Recurring          
Credit Derivatives [Line Items]          
Fair value of derivative liability $ 1,618   $ 1,618   1,799
Level 3 | Recurring          
Credit Derivatives [Line Items]          
Fair value of derivative liability 13   13   12
Level 3 | Recurring | Other financial derivative liabilities          
Credit Derivatives [Line Items]          
Fair value of derivative liability $ 13   $ 13   $ 12