Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Capitalized research expenditures	$ 37	$ 28
Deferred revenue	24	21
Tax credits	29	28
Net operating loss carryforwards	410	394
Other accruals	21	20
Inventory items	18	20
Capitalized software costs	2	8
Sales return/rebate reserve	48	41
Share-based compensation expense	12	15
Accrued bonus	7	3
Unrealized gain and losses on securities and investments	4	0
Valuation allowance	(421)	(56)
Total deferred tax assets	191	522
Deferred tax liabilities:
Depreciation and amortization	62	411
Unrealized gains and losses on securities and investments	0	2
Undistributed earnings	2	3
Total deferred tax liabilities	64	416
Net deferred tax assets	$ 127	$ 106