v3.10.0.1

Investments - Available-For-Sale Securities (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
One year or less (including restricted cash of $15)	$ 2,752
One year through two years	1,973
Two years through three years	1,451
Three years through four years	591
Four years through five years	117
Estimated Fair Value	6,884
Restricted cash	15
Short-term Investments
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Gross Amortized Cost	2,758	$ 3,746
Gross Unrealized Gains	1	1
Gross Unrealized Losses	(7)	(4)
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Estimated Fair Value	2,752	3,743
Short-term Investments | Restricted cash
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Gross Amortized Cost	15	20
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Estimated Fair Value	15	20
Short-term Investments | Corporate debt securities
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Gross Amortized Cost	2,702	3,726
Gross Unrealized Gains	1	1
Gross Unrealized Losses	(7)	(4)
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Estimated Fair Value	2,696	3,723
Short-term Investments | Government and agency securities
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Gross Amortized Cost	41
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Estimated Fair Value	41
Long-term Investments
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Gross Amortized Cost	4,171	5,458
Gross Unrealized Gains	7	12
Gross Unrealized Losses	(46)	(24)
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Estimated Fair Value	4,132	5,446
Long-term Investments | Corporate debt securities
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Gross Amortized Cost	4,171	5,458
Gross Unrealized Gains	7	12
Gross Unrealized Losses	(46)	(24)
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Estimated Fair Value	$ 4,132	$ 5,446

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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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Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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