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Investments (Amortized Cost and Fair Value of Available-for-Sale Debt Securities by Contractual Maturity) (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Due in one year or less, Amortized Cost $ 5,172  
Due after one year through five years, Amortized Cost 14,656  
Due after five years through ten years, Amortized Cost 10,930  
Due after ten years, Amortized Cost 4,741  
Total debt securities - available-for-sale, Amortized Cost 47,713 $ 47,451
Due in one year or less, Fair Value 5,137  
Due after one year through five years, Fair Value 14,021  
Due after five years through ten years, Fair Value 10,044  
Due after ten years, Fair Value 4,432  
Debt Securities, Available-for-sale 44,734 44,895
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One 363  
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five 171  
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 565 603
Held-to-maturity Securities, Debt Maturities, within One Year, Fair Value 362  
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five 168  
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 558 596
U.S. Agency Mortgage-Backed Securities [Member]    
Schedule of Investments [Line Items]    
Mortgage-backed securities, Amortized Cost 9,320  
Total debt securities - available-for-sale, Amortized Cost 9,320 8,982
Mortgage-backed securities, Fair Value 8,424  
Debt Securities, Available-for-sale 8,424 8,296
Non-U.S. Agency Mortgage-Backed Securities [Member]    
Schedule of Investments [Line Items]    
Mortgage-backed securities, Amortized Cost 2,894  
Total debt securities - available-for-sale, Amortized Cost 2,894 3,023
Mortgage-backed securities, Fair Value 2,676  
Debt Securities, Available-for-sale $ 2,676 $ 2,786