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Investment Securities (Contractual Maturity Distribution Of Debt Securities) (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Amortized Cost $ 19,969 $ 22,045
Fair Value 16,323 $ 19,012
Debt securities    
Schedule of Investments [Line Items]    
Available-for-sale, Within one year, Amortized Cost 662  
Available-for-sale, After one year through five years, Amortized Cost 1,380  
Available-for-sale, After five years through ten years, Amortized Cost 5,366  
Available-for-sale, After ten years, Amortized Cost 12,561  
Amortized Cost 19,969  
Available-for-sale, Within one year, Fair Value 641  
Available-for-sale, After one year through five years, Fair Value 1,278  
Available-for-sale, After five years through ten years, Fair Value 4,580  
Available-for-sale, After ten years, Fair Value 9,824  
Fair Value $ 16,323