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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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 + Details
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