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Derivative And Credit-Related Financial Instruments (Schedule Of Net Gains Recognized In Income On Customer-Initiated Derivatives) (Details) - Customer-initiated and other activities - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items]    
Net derivative gain recognized in income $ 18 $ 19
Interest rate contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Net derivative gain recognized in income 4 5
Energy contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Net derivative gain recognized in income 3 3
Foreign exchange contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Net derivative gain recognized in income $ 11 $ 11