Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Capitalized research expenditures	$ 14	$ 18
Deferred revenue	85	38
Tax credits	37	36
Net operating loss carryforwards	438	406
Other accruals	39	32
Inventory items	15	17
Sales return/rebate reserve	61	46
Share-based compensation expense	12	9
Unrealized gains and losses on securities and investments	0	19
Valuation allowance	(422)	(413)
Total deferred tax assets	279	208
Deferred tax liabilities:
Depreciation and amortization	84	67
Unrealized gains and losses on securities and investments	5	0
Undistributed earnings	4	2
Total deferred tax liabilities	93	69
Net deferred tax assets	$ 186	$ 139