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Investment Securities (Contractual Maturity Distribution Of Debt Securities) (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Amortized Cost $ 18,139 $ 19,541
Fair Value 15,886 $ 16,869
Debt securities    
Schedule of Investments [Line Items]    
Available-for-sale, Within one year, Amortized Cost 992  
Available-for-sale, After one year through five years, Amortized Cost 553  
Available-for-sale, After five years through ten years, Amortized Cost 5,149  
Available-for-sale, After ten years, Amortized Cost 11,445  
Amortized Cost 18,139  
Available-for-sale, Within one year, Fair Value 972  
Available-for-sale, After one year through five years, Fair Value 531  
Available-for-sale, After five years through ten years, Fair Value 4,783  
Available-for-sale, After ten years, Fair Value 9,600  
Fair Value $ 15,886