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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, 2025
Dec. 31, 2024
Schedule of Investments [Line Items]    
Due in one year or less, Amortized Cost $ 3,485  
Due after one year through five years, Amortized Cost 13,603  
Due after five years through ten years, Amortized Cost 11,582  
Due after ten years, Amortized Cost 6,701  
Total debt securities - available-for-sale, Amortized Cost 48,386 $ 49,815
Due in one year or less, Fair Value 3,466  
Due after one year through five years, Fair Value 13,360  
Due after five years through ten years, Fair Value 11,243  
Due after ten years, Fair Value 6,462  
Debt Securities, Available-for-sale 46,822 46,919
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One 264  
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five 202  
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 5  
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 17  
Debt Securities, Held-to-maturity 488 512
Held-to-maturity Securities, Debt Maturities, within One Year, Fair Value 264  
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five 202  
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 5  
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 15  
Debt Securities, Held-to-maturity, Fair Value 486 508
U.S. Agency Mortgage-Backed Securities [Member]    
Schedule of Investments [Line Items]    
Mortgage-backed securities, Amortized Cost 10,258  
Total debt securities - available-for-sale, Amortized Cost 10,258 10,577
Mortgage-backed securities, Fair Value 9,632  
Debt Securities, Available-for-sale 9,632 9,584
Non-U.S. Agency Mortgage-Backed Securities [Member]    
Schedule of Investments [Line Items]    
Mortgage-backed securities, Amortized Cost 2,757  
Total debt securities - available-for-sale, Amortized Cost 2,757 2,890
Mortgage-backed securities, Fair Value 2,659  
Debt Securities, Available-for-sale $ 2,659 $ 2,717