Consolidated Statements of Comprehensive Loss - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net loss	$ (544)	$ (522)	$ (294)
Other comprehensive (loss) income, before tax:
Change in cumulative translation adjustment	47	(24)	(9)
Net change in cash flow hedges	0	0
Net change in cash flow hedges			1
Pension liability	(2)	(3)	(4)
Other comprehensive (loss) income, before tax	45	(27)	(12)
Income tax benefit	1	2	1
Other comprehensive (loss) income, net of tax	46	(25)	(10)
Comprehensive loss	(498)	(547)	(304)
Less: Comprehensive income/( loss) attributable to non-controlling interest	2	(22)	(19)
Comprehensive loss attributable to controlling interest	$ (500)	$ (525)	$ (285)