Other Comprehensive Loss (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' equity	$ 1,927	$ 957	$ 1,089	$ 591
Cumulative translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' equity	(10)	(2)	(31)
Net gain (loss) of cash flow hedge derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' equity	0	(1)	8
Pension liability
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' equity	9	6	6
AOCI, tax portion	1	0	0
AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' equity	$ (19)	$ (8)	$ (29)