Other Comprehensive Loss (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' equity	$ 1,239	$ 1,818	$ 1,927	$ 957
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' equity	5	(44)	(19)	$ (8)
Cumulative translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' equity	15	(34)	(10)
Pension liability, net of tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' equity	(10)	(10)	(9)
AOCI, tax portion	$ 3	$ 3	$ 1