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Investments (Amortized Cost and Fair Value of Available-for-Sale Debt Securities by Contractual Maturity) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Due in one year or less, Amortized Cost $ 4,286  
Due after one year through five years, Amortized Cost 15,124  
Due after five years through ten years, Amortized Cost 10,844  
Due after ten years, Amortized Cost 5,192  
Total debt securities - available-for-sale, Amortized Cost 47,451 $ 45,926
Due in one year or less, Fair Value 4,260  
Due after one year through five years, Fair Value 14,556  
Due after five years through ten years, Fair Value 10,036  
Due after ten years, Fair Value 4,961  
Debt Securities, Available-for-sale 44,895 42,321
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost 313  
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value 310  
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost 246  
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value 244  
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost 26  
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value 25  
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Amortized Cost 18  
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value 17  
Debt Securities, Held-to-maturity 603 696
Debt Securities, Held-to-maturity, Fair Value 596 679
U.S. Agency Mortgage-Backed Securities [Member]    
Schedule of Investments [Line Items]    
Mortgage-backed securities, Amortized Cost 8,982  
Total debt securities - available-for-sale, Amortized Cost 8,982 7,379
Debt Securities, Available-for-sale 8,296 6,586
Mortgage-backed securities, Fair Value 8,296  
Non-U.S. Agency Mortgage-Backed Securities [Member]    
Schedule of Investments [Line Items]    
Mortgage-backed securities, Amortized Cost 3,023  
Total debt securities - available-for-sale, Amortized Cost 3,023 3,077
Debt Securities, Available-for-sale 2,786 $ 2,784
Mortgage-backed securities, Fair Value $ 2,786