Condensed Consolidated Statements of Changes in Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Additional Paid In Capital	Accumulated Deficit	Accumulated Other Comprehensive (loss)/ income	Non-controlling Interest
Balance at beginning of period at Dec. 31, 2019	$ 1,818	$ 111	$ 2,343	$ (681)	$ (44)	$ 89
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(453)			(454)		1
Foreign currency translation	15				14	1
Stock based compensation expense	6		6
Business divestitures	(88)				3	(91)
Balance at end of period at Sep. 30, 2020	1,298	111	2,349	(1,135)	(27)	$ 0
Balance at beginning of period at Dec. 31, 2020	1,239	111	2,349	(1,226)	5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(298)			(298)
Foreign currency translation	(15)				(15)
Stock based compensation expense	7		7
Issuance of common stock	1	1
Balance at end of period at Sep. 30, 2021	$ 934	$ 112	$ 2,356	$ (1,524)	$ (10)