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Investments (Amortized Cost and Fair Value of Available-for-Sale Debt Securities by Contractual Maturity) (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Due in one year or less, Amortized Cost $ 4,881  
Due after one year through five years, Amortized Cost 15,152  
Due after five years through ten years, Amortized Cost 10,993  
Due after ten years, Amortized Cost 5,032  
Total debt securities - available-for-sale, Amortized Cost 48,099 $ 47,451
Due in one year or less, Fair Value 4,861  
Due after one year through five years, Fair Value 14,810  
Due after five years through ten years, Fair Value 10,432  
Due after ten years, Fair Value 4,846  
Debt Securities, Available-for-sale 46,263 44,895
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One 320  
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five 113  
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 14  
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 17  
Debt Securities, Held-to-maturity 464 603
Held-to-maturity Securities, Debt Maturities, within One Year, Fair Value 319  
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five 114  
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 13  
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 15  
Debt Securities, Held-to-maturity, Fair Value 461 596
U.S. Agency Mortgage-Backed Securities [Member]    
Schedule of Investments [Line Items]    
Mortgage-backed securities, Amortized Cost 9,209  
Total debt securities - available-for-sale, Amortized Cost 9,209 8,982
Mortgage-backed securities, Fair Value 8,630  
Debt Securities, Available-for-sale 8,630 8,296
Non-U.S. Agency Mortgage-Backed Securities [Member]    
Schedule of Investments [Line Items]    
Mortgage-backed securities, Amortized Cost 2,832  
Total debt securities - available-for-sale, Amortized Cost 2,832 3,023
Mortgage-backed securities, Fair Value 2,684  
Debt Securities, Available-for-sale $ 2,684 $ 2,786