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Derivative And Credit-Related Financial Instruments (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Credit Derivatives [Line Items]              
Cash received as collateral for derivative assets $ 59         $ 59  
Fair value of securities pledged as collateral for derivative assets 4         4  
Cash posted as collateral for derivative liabilities 5         5  
Net cash flow hedge income (loss) included in interest and fees on loans (178)       $ (163) (522) $ (432)
De-designated Interest swaps           7,000  
Total Impact to risk management hedging income           (130)  
Impact to risk management hedging income     $ (39) $ (91)      
Amortized - probable cashflows in OCI (52) $ (52)          
Amoritized Off Market Element 43 49          
Net Benefit of Swaps (9) (3)          
Gain/Loss on cash flow hedge de-designation 7 $ 2          
Price alignment income 8       17 38 32
Net gain (loss) on open foreign currency positions         (1)   (1)
Allowance for credit losses on lending-related commitments 34     40   34  
Allowance for credit losses on lending-related commitments, amount related to unused commitments to extend credit 31     38   31  
Risk participation agreements covering standby and commercial letters of credit 73     85   73  
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 35     34   35  
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 3     2   3  
Notional amount of derivative credit risk participation agreements 1,000     1,000   1,000  
Maximum estimated exposure to credit risk participation agreements assuming 100% default 8     2   8  
Noninterest income 277       $ 295 804 $ 880
Recurring              
Credit Derivatives [Line Items]              
Fair value of derivative liability 1,051     1,322   1,051  
Level 3 | Recurring              
Credit Derivatives [Line Items]              
Fair value of derivative liability 11     12   11  
Level 3 | Recurring | Other financial derivative liabilities              
Credit Derivatives [Line Items]              
Fair value of derivative liability $ 11     $ 12   $ 11