Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Capitalized research expenditures	$ 46	$ 27
Capitalized software costs	43	0
Accrued bonus	17	12
Inventory items	27	2
Other accruals	43	55
Deferred revenue	59	79
Equity based compensation expense	17	14
Unrealized gain and losses on securities and investments	10	9
Net operating loss carryforwards	63	27
Tax credits	35	62
Sales return/rebate reserve	12	8
Valuation allowance	(48)	(57)
Total deferred tax assets	324	238
Deferred:
Unrealized loss on other investments	0	(1)
Depreciation and amortization	(273)	(311)
Undistributed earnings	0	(3)
Total deferred tax liabilities	(273)	(315)
Net deferred tax assets (liabilities)	$ 51
Net deferred tax assets (liabilities)		$ (77)