Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (94)	$ (132)	$ (298)	$ (453)
Other comprehensive loss, before tax:
Change in cumulative translation adjustment	(5)	15	(15)	15
Other comprehensive (loss)/ income, before tax	(5)	15	(15)	15
Other comprehensive (loss)/ income, net of tax	(5)	15	(15)	15
Comprehensive loss	(99)	(117)	(313)	(438)
Less: Comprehensive income attributable to non-controlling interest	0	0	0	2
Comprehensive loss attributable to controlling interest	$ (99)	$ (117)	$ (313)	$ (440)