Investments - Available-For-Sale Securities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Estimated Fair Value	$ 2,684
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]
One year or less (including restricted cash of $143)	2,398
One year through two years	198
Two years through three years	88
Estimated Fair Value	2,684
Short-term Investments
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Gross Amortized Cost	2,395	$ 1,849
Gross Unrealized Gains	3	1
Gross Unrealized Losses	0	0
Estimated Fair Value	2,398	1,850
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]
Estimated Fair Value	2,398	1,850
Short-term Investments \| Restricted cash
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Gross Amortized Cost	143	21
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	143	21
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]
Estimated Fair Value	143	21
Short-term Investments \| Corporate debt securities
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Gross Amortized Cost	2,252	1,653
Gross Unrealized Gains	3	1
Gross Unrealized Losses	0	0
Estimated Fair Value	2,255	1,654
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]
Estimated Fair Value	2,255	1,654
Short-term Investments \| Government and agency securities
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Gross Amortized Cost		175
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Estimated Fair Value		175
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]
Estimated Fair Value		175
Long-term Investments
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Gross Amortized Cost	284	957
Gross Unrealized Gains	2	4
Gross Unrealized Losses	0	0
Estimated Fair Value	286	961
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]
Estimated Fair Value	286	961
Long-term Investments \| Corporate debt securities
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Gross Amortized Cost	284	957
Gross Unrealized Gains	2	4
Gross Unrealized Losses	0	0
Estimated Fair Value	286	961
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]
Estimated Fair Value	$ 286	$ 961

Available for sale securities debt maturities one year through two years

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Available For Sale Securities Debt Maturities After Two Through Three 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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Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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