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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	Mar. 31, 2026	Dec. 31, 2025
Unrealized Losses
Less Than 12 Months	$ (33)	$ (5)
12 Months or More	(332)	(320)
Fair Value
Fair Value, Less Than 12 Months	3,724	1,183
Fair Value, 12 Months or More	5,626	6,166
U.S. Treasury securities and obligations of U.S. government corporations and agencies
Unrealized Losses
Less Than 12 Months	(1)	0
12 Months or More	0	(1)
Fair Value
Fair Value, Less Than 12 Months	203	88
Fair Value, 12 Months or More	28	43
Corporate securities
Unrealized Losses
Less Than 12 Months	(20)	(2)
12 Months or More	(153)	(144)
Fair Value
Fair Value, Less Than 12 Months	2,130	464
Fair Value, 12 Months or More	2,933	3,226
Municipal securities
Unrealized Losses
Less Than 12 Months	(4)	(1)
12 Months or More	(68)	(68)
Fair Value
Fair Value, Less Than 12 Months	582	241
Fair Value, 12 Months or More	1,431	1,550
Asset-backed securities
Unrealized Losses
Less Than 12 Months	(3)	(2)
12 Months or More	(10)	(8)
Fair Value
Fair Value, Less Than 12 Months	307	114
Fair Value, 12 Months or More	159	180
Residential mortgage-backed securities
Unrealized Losses
Less Than 12 Months	(3)	0
12 Months or More	(72)	(70)
Fair Value
Fair Value, Less Than 12 Months	267	120
Fair Value, 12 Months or More	618	687
Commercial mortgage-backed securities
Unrealized Losses
Less Than 12 Months	(2)	0
12 Months or More	(29)	(29)
Fair Value
Fair Value, Less Than 12 Months	235	156
Fair Value, 12 Months or More	$ 457	$ 480

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