Investments - Available-For-Sale Securities (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
One year or less (including restricted cash of $17)	$ 2,746
One year through two years	1,597
Two years through three years	792
Three years through four years	426
Estimated Fair Value	5,561
Restricted cash	17
Short-term Investments
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Gross Amortized Cost	2,750	$ 2,722
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(5)	(9)
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Estimated Fair Value	2,746	2,713
Short-term Investments \| Restricted cash
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Gross Amortized Cost	17	17
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Estimated Fair Value	17	17
Short-term Investments \| Corporate debt securities
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Gross Amortized Cost	2,733	2,615
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(5)	(9)
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Estimated Fair Value	2,729	2,606
Short-term Investments \| Government and agency securities
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Gross Amortized Cost		90
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Estimated Fair Value		90
Long-term Investments
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Gross Amortized Cost	2,827	3,682
Gross Unrealized Gains	3	1
Gross Unrealized Losses	(15)	(48)
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Estimated Fair Value	2,815	3,635
Long-term Investments \| Corporate debt securities
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Gross Amortized Cost	2,827	3,682
Gross Unrealized Gains	3	1
Gross Unrealized Losses	(15)	(48)
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Estimated Fair Value	$ 2,815	$ 3,635

Available for sale securities debt maturities one year through two years

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Available For Sale Securities Debt Maturities After three Through Four 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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Amortized cost 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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