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Investments (Short-Term and Long-Term Investments) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost $ 47,451 $ 45,926
Securities, Available for sale Debt Securities, Gross Unrealized Gains 134 59
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (2,690) (3,664)
Debt Securities, Available-for-sale 44,895 42,321
Held-to-maturity securities, Amortized Cost 603 696
Securities, Held to maturity, Unrecognized Holding Gain 1 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (8) (17)
Debt Securities, Held-to-maturity, Fair Value 596 679
Total investments, Amortized Cost 48,054 46,622
Total investments, Gross Unrealized Gains 135 59
Total investments, Gross Unrealized Losses (2,698) (3,681)
Investments, Fair Value Disclosure 45,491 43,000
Debt Securities - available-for-sale    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale 44,895 42,321
U.S. Government and Agency Obligations [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 4,674 4,093
Securities, Available for sale Debt Securities, Gross Unrealized Gains 3 1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (234) (285)
Debt Securities, Available-for-sale 4,443 3,809
Held-to-maturity securities, Amortized Cost 506 578
Securities, Held to maturity, Unrecognized Holding Gain 1 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (6) (14)
Debt Securities, Held-to-maturity, Fair Value 501 564
State and Municipal Obligations [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 7,636 7,702
Securities, Available for sale Debt Securities, Gross Unrealized Gains 39 25
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (322) (479)
Debt Securities, Available-for-sale 7,353 7,248
Held-to-maturity securities, Amortized Cost 28 29
Securities, Held to maturity, Unrecognized Holding Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (2) (3)
Debt Securities, Held-to-maturity, Fair Value 26 26
Corporate Obligations [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 23,136 23,675
Securities, Available for sale Debt Securities, Gross Unrealized Gains 67 17
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (1,186) (1,798)
Debt Securities, Available-for-sale 22,017 21,894
Held-to-maturity securities, Amortized Cost 69 89
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 69 89
U.S. Agency Mortgage-Backed Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 8,982 7,379
Securities, Available for sale Debt Securities, Gross Unrealized Gains 22 15
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (708) (808)
Debt Securities, Available-for-sale 8,296 6,586
Non-U.S. Agency Mortgage-Backed Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 3,023 3,077
Securities, Available for sale Debt Securities, Gross Unrealized Gains 3 1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (240) (294)
Debt Securities, Available-for-sale $ 2,786 $ 2,784