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Derivative And Credit-Related Financial Instruments (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Credit Derivatives [Line Items]            
Cash received as collateral for derivative assets $ 86       $ 86  
Fair value of securities pledged as collateral for derivative assets 84       84  
Cash posted as collateral for derivative liabilities 5       5  
Net cash flow hedge income (loss) included in interest and fees on loans (174)     $ (150) (344) $ (269)
De-designated Interest swaps         7,000  
Total Impact to risk management hedging income         (130)  
Impact to risk management hedging income   $ (39) $ (91)      
Amoritized Off Market Element 49 41        
Net Benefit of Swaps (3) 3        
Gain/Loss on cash flow hedge de-designation 2 27        
Price alignment income 17     7 30 15
Net gain (loss) on open foreign currency positions       (1)   (1)
Allowance for credit losses on lending-related commitments 31   40   31  
Allowance for credit losses on lending-related commitments, amount related to unused commitments to extend credit 30   38   30  
Risk participation agreements covering standby and commercial letters of credit 75   85   75  
Standby and commercial letters of credit 3,800   3,600   3,800  
Carrying value of standby and commercial letters of credit included in accrued expenses and other liabilities 33   34   33  
Deferred fees on standby and commercial letters of credit included in accrued expenses and other liabilities 32   32   32  
Allowance for credit losses on lending-related commitments, amount related to standby and commercial letters of credit 1   2   1  
Notional amount of derivative credit risk participation agreements 1,000       $ 1,000  
Maximum estimated exposure to credit risk participation agreements assuming 100% default     2      
Weighted average remaining maturity of credit risk participation agreements (in years)         4 years 1 month 6 days  
Amortized - probable cashflows in OCI (52) $ (52)        
Noninterest income 291     $ 303 $ 527 $ 585
Recurring            
Credit Derivatives [Line Items]            
Fair value of derivative liability 1,176   1,322   1,176  
Level 3 | Recurring            
Credit Derivatives [Line Items]            
Fair value of derivative liability 6   12   6  
Level 3 | Recurring | Other financial derivative liabilities            
Credit Derivatives [Line Items]            
Fair value of derivative liability $ 6   $ 12   $ 6