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Investments (Amortized Cost and Fair Value of Available-for-Sale Debt Securities by Contractual Maturity) (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Schedule of Investments [Line Items]    
Due in one year or less, Amortized Cost $ 3,693  
Due after one year through five years, Amortized Cost 14,251  
Due after five years through ten years, Amortized Cost 12,248  
Due after ten years, Amortized Cost 5,291  
Total debt securities - available-for-sale, Amortized Cost 48,832 $ 49,815
Due in one year or less, Fair Value 3,670  
Due after one year through five years, Fair Value 13,885  
Due after five years through ten years, Fair Value 11,536  
Due after ten years, Fair Value 4,959  
Debt Securities, Available-for-sale 46,447 46,919
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One 341  
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five 120  
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 492 512
Held-to-maturity Securities, Debt Maturities, within One Year, Fair Value 341  
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five 121  
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 14  
Debt Securities, Held-to-maturity, Fair Value 489 508
U.S. Agency Mortgage-Backed Securities [Member]    
Schedule of Investments [Line Items]    
Mortgage-backed securities, Amortized Cost 10,410  
Total debt securities - available-for-sale, Amortized Cost 10,410 10,577
Mortgage-backed securities, Fair Value 9,603  
Debt Securities, Available-for-sale 9,603 9,584
Non-U.S. Agency Mortgage-Backed Securities [Member]    
Schedule of Investments [Line Items]    
Mortgage-backed securities, Amortized Cost 2,939  
Total debt securities - available-for-sale, Amortized Cost 2,939 2,890
Mortgage-backed securities, Fair Value 2,794  
Debt Securities, Available-for-sale $ 2,794 $ 2,717