Investments - Available-For-Sale Securities (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Investments
Estimated Fair Value	$ 5,483
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]
One year or less (including restricted cash of $15)	4,738
One year through two years	243
Two years through three years	289
Three years through four years	80
Four years through five years	133
Estimated Fair Value	5,483
Short-term investments
Investments
Gross Amortized Cost	4,736	$ 2,389
Gross Unrealized Gains	2	3
Gross Unrealized Losses	0	0
Estimated Fair Value	4,738	2,392
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]
Estimated Fair Value	4,738	2,392
Short-term investments \| Restricted cash
Investments
Gross Amortized Cost	15	137
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	15	137
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]
Estimated Fair Value	15	137
Short-term investments \| Corporate debt securities
Investments
Gross Amortized Cost	4,596	2,252
Gross Unrealized Gains	2	3
Gross Unrealized Losses	0	0
Estimated Fair Value	4,598	2,255
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]
Estimated Fair Value	4,598	2,255
Short-term investments \| Government and agency securities
Investments
Gross Amortized Cost	125
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	125
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]
Estimated Fair Value	125
Long-term Investments
Investments
Gross Amortized Cost	744	284
Gross Unrealized Gains	2	2
Gross Unrealized Losses	(1)	0
Estimated Fair Value	745	286
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]
Estimated Fair Value	745	286
Long-term Investments \| Corporate debt securities
Investments
Gross Amortized Cost	635	284
Gross Unrealized Gains	2	2
Gross Unrealized Losses	(1)	0
Estimated Fair Value	636	286
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]
Estimated Fair Value	636	$ 286
Long-term Investments \| Government and agency securities
Investments
Gross Amortized Cost	109
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	109
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]
Estimated Fair Value	$ 109

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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