Investments - Available-For-Sale Securities (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Investments
Estimated Fair Value	$ 3,902
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]
One year or less (including restricted cash of $22)	3,245
One year through two years	166
Two years through three years	314
Three years through four years	83
Four years through five years	90
Five years through six years	4
Estimated Fair Value	3,902
Short-term investments
Investments
Gross Amortized Cost	3,243	$ 2,389
Gross Unrealized Gains	2	3
Gross Unrealized Losses	0	0
Estimated Fair Value	3,245	2,392
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]
Estimated Fair Value	3,245	2,392
Short-term investments \| Restricted cash
Investments
Gross Amortized Cost	22	137
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	22	137
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]
Estimated Fair Value	22	137
Short-term investments \| Corporate debt securities
Investments
Gross Amortized Cost	3,196	2,252
Gross Unrealized Gains	2	3
Gross Unrealized Losses	0	0
Estimated Fair Value	3,198	2,255
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]
Estimated Fair Value	3,198	2,255
Short-term investments \| Government and agency securities
Investments
Gross Amortized Cost	25
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	25
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]
Estimated Fair Value	25
Long-term Investments
Investments
Gross Amortized Cost	657	284
Gross Unrealized Gains	1	2
Gross Unrealized Losses	(1)	0
Estimated Fair Value	657	286
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]
Estimated Fair Value	657	286
Long-term Investments \| Corporate debt securities
Investments
Gross Amortized Cost	554	284
Gross Unrealized Gains	1	2
Gross Unrealized Losses	(1)	0
Estimated Fair Value	554	286
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]
Estimated Fair Value	554	$ 286
Long-term Investments \| Government and agency securities
Investments
Gross Amortized Cost	103
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	103
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]
Estimated Fair Value	$ 103

Available-For-Sale Securities, Debt Maturities , After Five Through Six Years, Fair Value

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Available-For-Sale Securities, Debt Maturities , After Four Through Five Years, Fair Value

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Available for sale securities debt maturities one year through two years

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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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