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Investment Securities (Contractual Maturity Distribution Of Debt Securities) (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Amortized Cost $ 18,610 $ 19,541
Fair Value 15,656 $ 16,869
Debt securities    
Schedule of Investments [Line Items]    
Available-for-sale, Within one year, Amortized Cost 893  
Available-for-sale, After one year through five years, Amortized Cost 777  
Available-for-sale, After five years through ten years, Amortized Cost 5,206  
Available-for-sale, After ten years, Amortized Cost 11,734  
Amortized Cost 18,610  
Available-for-sale, Within one year, Fair Value 869  
Available-for-sale, After one year through five years, Fair Value 731  
Available-for-sale, After five years through ten years, Fair Value 4,637  
Available-for-sale, After ten years, Fair Value 9,419  
Fair Value $ 15,656