Investments - Available-For-Sale Securities (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
One year or less (including restricted cash of $17)	$ 2,713
One year through two years	1,922
Two years through three years	1,123
Three years through four years	473
Four years through five years	117
Thereafter	0
Total	6,348
Restricted cash	17
Short-term Investments
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Gross Amortized Cost	2,722	$ 3,746
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(9)	(4)
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Total	2,713	3,743
Short-term Investments \| Restricted cash
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Gross Amortized Cost	17	20
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Total	17	20
Short-term Investments \| Corporate debt securities
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Gross Amortized Cost	2,615	3,726
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(9)	(4)
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Total	2,606	3,723
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]
Total	90
Long-term Investments
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Gross Amortized Cost	3,682	5,458
Gross Unrealized Gains	1	12
Gross Unrealized Losses	(48)	(24)
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Total	3,635	5,446
Long-term Investments \| Corporate debt securities
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Gross Amortized Cost	3,682	5,458
Gross Unrealized Gains	1	12
Gross Unrealized Losses	(48)	(24)
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Total	$ 3,635	$ 5,446

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

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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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Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), maturing in next fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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