Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Deferred Tax Assets: Net Operating Loss Carryforwards	$ 344	$ 322
Deferred Tax Assets: Stock-Based Compensation	163	165
Deferred Tax Assets: Reserves and Accruals not Currently Deductible	426	336
Deferred Tax Assets, Deferred Revenue	0	27
Deferred Tax Assets, Property, Plant and Equipment	61	56
Deferred Tax Assets, Research and Other Credit Carryforwards	363	293
Deferred Tax Assets: Other, Net	183	102
Total Deferred Tax Assets Before Valuation Allowance	1,540	1,301
Valuation Allowance	(331)	(162)
Total Deferred Tax Assets	1,209	1,139
Deferred Tax Liabilities: Intangibles	(1,667)	(1,316)
Deferred Tax Liabilities, Other	(80)	(70)
Deferred Tax Liabilities, Gross	(1,747)	(1,386)
Deferred Tax Liabilities, Net	$ (538)	$ (247)