Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
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