Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Capitalized research expenditures	$ 58	$ 46
Deferred revenue	57	59
Tax credits	33	32
Net operating loss carryforwards	35	65
Other accruals	35	47
Inventory items	27	27
Capitalized software costs	25	43
Sales return/rebate reserve	23	22
Share-based compensation expense	15	15
Accrued bonus	11	16
Unrealized gain and losses on securities and investments	4	10
Valuation allowance	(47)	(48)
Total deferred tax assets	276	334
Deferred:
Unrealized loss on other investments	0	0
Depreciation and amortization	165	265
Undistributed earnings	1	0
Total deferred tax liabilities	$ 166	$ 265