Income Taxes - Reconciliation of the (Benefit) Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation [Abstract]
Income tax expense at the federal statutory rate	$ (77)	$ 40	$ 36
Foreign rate differential	(9)	(16)	(17)
State income taxes, net of effect of federal tax benefit	(11)	9	9
Unrecognized tax benefits and related interest	4	11	15
Change in cost-sharing treatment of stock-based compensation		15	(3)
FDII, GILTI and other provisions		3	5
Rate differential on US NOL carryback	23
Research tax credit	9	11	9
Stock-based compensation	14	4	8
Change in valuation allowance	25	6	9
Local income tax on intercompany transactions	1	7	10
Executive compensation	6	3	2
Other, net	(1)	3	5
(Benefit) provision for income taxes	$ (80)	$ 68	$ 60