Investments (Short-Term and Long-Term Investments) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 49,578	$ 49,815
Securities, Available for sale Debt Securities, Gross Unrealized Gains	229	62
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(1,625)	(2,958)
Debt Securities, Available-for-sale	48,182	46,919
Held-to-maturity securities, Amortized Cost	490	512
Securities, Held to maturity, Unrecognized Holding Gain	2	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(3)	(4)
Debt Securities, Held-to-maturity, Fair Value	489	508
Total investments, Amortized Cost	50,068	50,327
Total investments, Gross Unrealized Gains	231	62
Total investments, Gross Unrealized Losses	(1,628)	(2,962)
Investments, Fair Value Disclosure	48,671	47,427
Debt Securities - available-for-sale
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale	48,182	46,919
U.S. Government and Agency Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	4,086	4,600
Securities, Available for sale Debt Securities, Gross Unrealized Gains	2	1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(156)	(274)
Debt Securities, Available-for-sale	3,932	4,327
Held-to-maturity securities, Amortized Cost	461	444
Securities, Held to maturity, Unrecognized Holding Gain	2	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(1)	(2)
Debt Securities, Held-to-maturity, Fair Value	462	442
State and Municipal Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	6,533	7,357
Securities, Available for sale Debt Securities, Gross Unrealized Gains	24	2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(232)	(375)
Debt Securities, Available-for-sale	6,325	6,984
Held-to-maturity securities, Amortized Cost	26	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	24	26
Corporate Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	25,927	24,391
Securities, Available for sale Debt Securities, Gross Unrealized Gains	159	56
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(540)	(1,140)
Debt Securities, Available-for-sale	25,546	23,307
Held-to-maturity securities, Amortized Cost	3	40
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	3	40
U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	10,284	10,577
Securities, Available for sale Debt Securities, Gross Unrealized Gains	33	1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(598)	(994)
Debt Securities, Available-for-sale	9,719	9,584
Non-U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	2,748	2,890
Securities, Available for sale Debt Securities, Gross Unrealized Gains	11	2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(99)	(175)
Debt Securities, Available-for-sale	$ 2,660	$ 2,717

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