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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Income Tax Disclosure [Abstract] |  |  |
Deferred Tax Assets: Net Operating Loss Carryforwards | $ 322 | $ 175 |
Deferred Tax Assets: Stock-Based Compensation | 165 | 212 |
Deferred Tax Assets: Reserves and Accruals not Currently Deductible | 336 | 617 |
Deferred Tax Assets, Deferred Revenue | 27 | 56 |
Deferred Tax Assets: Depreciation Related | 56 | 88 |
Deferred Tax Assets, Research and Other Credit Carryforwards | 293 | 147 |
Deferred Tax Assets: Other, Net | 102 | 221 |
Total Deferred Tax Assets Before Valuation Allowance | 1,301 | 1,516 |
Valuation Allowance | (162) | (126) | $ (6)
Total Deferred Tax Assets | 1,139 | 1,390 |
Deferred Tax Liabilities: Intangibles | (1,316) | (104) |
Deferred Tax Liabilities, Other | (70) | (31) |
Deferred Tax Liabilities, Gross | (1,386) | (135) |
Deferred Tax Liabilities, Net | $ (247) |  |
Net Deferred Tax Assets |  | $ 1,255 |

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