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Short-term and Long-term Investments, Restricted Deposits - Schedule of Fair Value of Available-For-Sale Investments with Gross Unrealized Losses by Investment Type and Length of Time (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Unrealized Losses
Less Than 12 Months	$ (5)	$ (84)
12 Months or More	(320)	(643)
Fair Value
Fair Value, Less Than 12 Months	1,183	5,195
Fair Value, 12 Months or More	6,166	8,734
U.S. Treasury securities and obligations of U.S. government corporations and agencies
Unrealized Losses
Less Than 12 Months	0	(1)
12 Months or More	(1)	(3)
Fair Value
Fair Value, Less Than 12 Months	88	60
Fair Value, 12 Months or More	43	144
Corporate securities
Unrealized Losses
Less Than 12 Months	(2)	(41)
12 Months or More	(144)	(319)
Fair Value
Fair Value, Less Than 12 Months	464	2,621
Fair Value, 12 Months or More	3,226	4,782
Municipal securities
Unrealized Losses
Less Than 12 Months	(1)	(16)
12 Months or More	(68)	(135)
Fair Value
Fair Value, Less Than 12 Months	241	1,217
Fair Value, 12 Months or More	1,550	2,073
Asset-backed securities
Unrealized Losses
Less Than 12 Months	(2)	(4)
12 Months or More	(8)	(17)
Fair Value
Fair Value, Less Than 12 Months	114	301
Fair Value, 12 Months or More	180	331
Residential mortgage-backed securities
Unrealized Losses
Less Than 12 Months	0	(18)
12 Months or More	(70)	(111)
Fair Value
Fair Value, Less Than 12 Months	120	786
Fair Value, 12 Months or More	687	738
Commercial mortgage-backed securities
Unrealized Losses
Less Than 12 Months	0	(4)
12 Months or More	(29)	(58)
Fair Value
Fair Value, Less Than 12 Months	156	210
Fair Value, 12 Months or More	$ 480	$ 666

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