Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Net operating loss carryforward	$ 476	$ 130
Tax credit carryforward	297	190
Share-based compensation	529	225
Accrued expenses and other liabilities	239	136
Other	34	21
Total deferred tax assets	1,575	702
Less: valuation allowance	(205)	(101)
Deferred tax assets, net of valuation allowance	1,370	601
Deferred tax liabilities:
Depreciation and amortization	(270)	(101)
Purchased intangible assets	(934)	(1,190)
Deferred foreign taxes	(15)	0
Total deferred tax liabilities	(1,219)	(1,291)
Net deferred tax assets	$ 151
Net deferred tax liabilities		$ (690)