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Investments (Short-Term and Long-Term Investments) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost $ 49,815 $ 47,451
Securities, Available for sale Debt Securities, Gross Unrealized Gains 62 134
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (2,958) (2,690)
Debt Securities, Available-for-sale 46,919 44,895
Held-to-maturity securities, Amortized Cost 512 603
Securities, Held to maturity, Unrecognized Holding Gain 0 1
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (4) (8)
Debt Securities, Held-to-maturity, Fair Value 508 596
Total investments, Amortized Cost 50,327 48,054
Total investments, Gross Unrealized Gains 62 135
Total investments, Gross Unrealized Losses (2,962) (2,698)
Investments, Fair Value Disclosure 47,427 45,491
Debt Securities - available-for-sale    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale 46,919 44,895
U.S. Government and Agency Obligations [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 4,600 4,674
Securities, Available for sale Debt Securities, Gross Unrealized Gains 1 3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (274) (234)
Debt Securities, Available-for-sale 4,327 4,443
Held-to-maturity securities, Amortized Cost 444 506
Securities, Held to maturity, Unrecognized Holding Gain 0 1
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (2) (6)
Debt Securities, Held-to-maturity, Fair Value 442 501
State and Municipal Obligations [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 7,357 7,636
Securities, Available for sale Debt Securities, Gross Unrealized Gains 2 39
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (375) (322)
Debt Securities, Available-for-sale 6,984 7,353
Held-to-maturity securities, Amortized Cost 28 28
Securities, Held to maturity, Unrecognized Holding Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (2) (2)
Debt Securities, Held-to-maturity, Fair Value 26 26
Corporate Obligations [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 24,391 23,136
Securities, Available for sale Debt Securities, Gross Unrealized Gains 56 67
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (1,140) (1,186)
Debt Securities, Available-for-sale 23,307 22,017
Held-to-maturity securities, Amortized Cost 40 69
Securities, Held to maturity, Unrecognized Holding Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 0 0
Debt Securities, Held-to-maturity, Fair Value 40 69
U.S. Agency Mortgage-Backed Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 10,577 8,982
Securities, Available for sale Debt Securities, Gross Unrealized Gains 1 22
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (994) (708)
Debt Securities, Available-for-sale 9,584 8,296
Non-U.S. Agency Mortgage-Backed Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 2,890 3,023
Securities, Available for sale Debt Securities, Gross Unrealized Gains 2 3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (175) (240)
Debt Securities, Available-for-sale $ 2,717 $ 2,786