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Investments - Available-For-Sale Securities (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract] |  |
Estimated Fair Value | $ 3,088 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract] |  |
One year or less (including restricted cash of $126) | 2,697 |
One year through two years | 303 |
Two years through three years | 88 |
Estimated Fair Value | 3,088 |
Short-term investments |  |
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract] |  |
Gross Amortized Cost | 2,694 | $ 1,849
Gross Unrealized Gains | 3 | 1
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 2,697 | 1,850
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract] |  |
Estimated Fair Value | 2,697 | 1,850
Short-term investments | Restricted cash |  |
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract] |  |
Gross Amortized Cost | 126 | 21
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 126 | 21
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract] |  |
Estimated Fair Value | 126 | 21
Short-term investments | Corporate debt securities |  |
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract] |  |
Gross Amortized Cost | 2,568 | 1,653
Gross Unrealized Gains | 3 | 1
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 2,571 | 1,654
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract] |  |
Estimated Fair Value | 2,571 | 1,654
Short-term investments | Government and agency securities |  |
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract] |  |
Gross Amortized Cost |  | 175
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Estimated Fair Value |  | 175
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract] |  |
Estimated Fair Value |  | 175
Long-term Investments |  |
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract] |  |
Gross Amortized Cost | 387 | 957
Gross Unrealized Gains | 4 | 4
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 391 | 961
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract] |  |
Estimated Fair Value | 391 | 961
Long-term Investments | Corporate debt securities |  |
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract] |  |
Gross Amortized Cost | 387 | 957
Gross Unrealized Gains | 4 | 4
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 391 | 961
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract] |  |
Estimated Fair Value | $ 391 | $ 961

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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=121645371&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=121645371&loc=d3e27161-111563 + Details
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