Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 30	$ (67)	$ 125
Other comprehensive income (loss):
Foreign currency translation adjustments	(13)	16	(7)
Derivatives:
Unrealized loss on derivatives, before tax	(7)	0	0
Unrealized loss on derivatives, tax portion	1	0	0
Unrealized loss on derivatives, net of tax	(6)	0	0
Defined benefit plans:
Reclassification of loss to net income (loss)	5	4	3
Defined benefit plan adjustment, before tax	(14)	(6)	(12)
Defined benefit plan adjustment, tax portion	1	1	3
Defined benefit plan adjustment, net of tax	(8)	(1)	(6)
Other comprehensive (loss) income	(27)	15	(13)
Comprehensive income (loss)	$ 3	$ (52)	$ 112