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Short-term and Long-term Investments, Restricted Deposits - Schedule of Short-term and Long-term Investments and Restricted Deposits by Investment Type (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Debt securities:
Gross Unrealized Gains	$ 148	$ 256
Gross Unrealized Losses	(365)	(325)
Equity securities	1	1
Private equity investments	896	915
Life insurance contracts	210	217
Total, Amortized Cost	20,725	20,948
Total, Fair Value	20,508	20,879
U.S. Treasury securities and obligations of U.S. government corporations and agencies
Debt securities:
Amortized Cost	532	533
Gross Unrealized Gains	1	3
Gross Unrealized Losses	(1)	(1)
Fair Value	532	535
Corporate securities
Debt securities:
Amortized Cost	10,676	10,642
Gross Unrealized Gains	89	166
Gross Unrealized Losses	(173)	(146)
Fair Value	10,592	10,662
Restricted certificates of deposit
Debt securities:
Amortized Cost	1	1
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	1	1
Restricted cash equivalents
Debt securities:
Amortized Cost	89	69
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	89	69
Short-term time deposits
Debt securities:
Amortized Cost	68	205
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	68	205
Municipal securities
Debt securities:
Amortized Cost	3,736	3,790
Gross Unrealized Gains	25	37
Gross Unrealized Losses	(72)	(69)
Fair Value	3,689	3,758
Asset-backed securities
Debt securities:
Amortized Cost	1,612	1,656
Gross Unrealized Gains	13	20
Gross Unrealized Losses	(13)	(10)
Fair Value	1,612	1,666
Residential mortgage-backed securities
Debt securities:
Amortized Cost	1,764	1,763
Gross Unrealized Gains	14	21
Gross Unrealized Losses	(75)	(70)
Fair Value	1,703	1,714
Commercial mortgage-backed securities
Debt securities:
Amortized Cost	1,140	1,156
Gross Unrealized Gains	6	9
Gross Unrealized Losses	(31)	(29)
Fair Value	$ 1,115	$ 1,136

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