Consolidated Statements of Comprehensive Loss - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (385)	$ (544)	$ (522)
Other comprehensive (loss) income, before tax:
Change in cumulative translation adjustment	(19)	47	(24)
Pension gains /(losses)	8	(2)	(3)
Other comprehensive (loss) income, before tax	(11)	45	(27)
Income tax (expense) /benefit	(2)	1	2
Other comprehensive (loss) income, net of tax	(13)	46	(25)
Comprehensive loss	(398)	(498)	(547)
Less: Comprehensive income/(loss) attributable to non-controlling interest	0	2	(22)
Comprehensive loss attributable to controlling interest	$ (398)	$ (500)	$ (525)