Investments - Available-For-Sale Securities (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Investments
Estimated Fair Value	$ 2,897
Short-term investments:
Investments
Gross Amortized Cost	1,831	$ 2,532
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(10)	(11)
Estimated Fair Value	1,821	2,521
Short-term investments: \| Restricted cash
Investments
Gross Amortized Cost	41	36
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	41	36
Short-term investments: \| Corporate debt securities
Investments
Gross Amortized Cost	1,649	2,355
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(6)	(5)
Estimated Fair Value	1,643	2,350
Short-term investments: \| Government and agency securities
Investments
Gross Amortized Cost	141	141
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(4)	(6)
Estimated Fair Value	137	135
Long-term investments:
Investments
Gross Amortized Cost	1,145	1,303
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(69)	(87)
Estimated Fair Value	1,076	1,216
Long-term investments: \| Restricted cash
Investments
Gross Amortized Cost	5	13
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	5	13
Long-term investments: \| Corporate debt securities
Investments
Gross Amortized Cost	515	686
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(30)	(40)
Estimated Fair Value	485	646
Long-term investments: \| Government and agency securities
Investments
Gross Amortized Cost	625	604
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(39)	(47)
Estimated Fair Value	$ 586	$ 557

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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+ References

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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