Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (66)	$ (30)	$ (103)	$ (52)
Other comprehensive income (loss), before tax:
Change in cumulative translation adjustment	(15)	5	(4)	15
Net change in cash flow hedges	1	(4)	1	(6)
Pension liability	(1)	0	(1)	0
Other comprehensive income (loss), before tax	(15)	1	(4)	9
Expense for taxes	0	0	0	0
Other comprehensive income (loss), net of tax	(15)	1	(4)	9
Comprehensive loss	(81)	(29)	(107)	(43)
Less: Comprehensive loss attributable to non-controlling interest	(5)	(1)	(7)	(2)
Comprehensive loss attributable to controlling interest	$ (76)	$ (28)	$ (100)	$ (41)