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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, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Due in one year or less, Amortized Cost $ 3,952  
Due after one year through five years, Amortized Cost 14,845  
Due after five years through ten years, Amortized Cost 12,110  
Due after ten years, Amortized Cost 5,441  
Total debt securities - available-for-sale, Amortized Cost 49,815 $ 47,451
Due in one year or less, Fair Value 3,932  
Due after one year through five years, Fair Value 14,384  
Due after five years through ten years, Fair Value 11,213  
Due after ten years, Fair Value 5,089  
Debt Securities, Available-for-sale 46,919 44,895
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost 320  
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value 319  
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost 161  
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value 161  
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost 14  
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value 13  
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Amortized Cost 17  
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value 15  
Debt Securities, Held-to-maturity 512 603
Debt Securities, Held-to-maturity, Fair Value 508 596
U.S. Agency Mortgage-Backed Securities [Member]    
Schedule of Investments [Line Items]    
Mortgage-backed securities, Amortized Cost 10,577  
Total debt securities - available-for-sale, Amortized Cost 10,577 8,982
Debt Securities, Available-for-sale 9,584 8,296
Mortgage-backed securities, Fair Value 9,584  
Non-U.S. Agency Mortgage-Backed Securities [Member]    
Schedule of Investments [Line Items]    
Mortgage-backed securities, Amortized Cost 2,890  
Total debt securities - available-for-sale, Amortized Cost 2,890 3,023
Debt Securities, Available-for-sale 2,717 $ 2,786
Mortgage-backed securities, Fair Value $ 2,717