Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid In Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Non-controlling Interest
Balance at beginning of period at Dec. 31, 2018	$ 1,927	$ 87	$ 1,938	$ (181)	$ (19)	$ 101
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(290)			(270)		(20)
Foreign currency translation	(13)				(15)	2
Stock based compensation expense	3		3		0
Issuance of common stock	403	24	379
Purchase of minority interest	0		(14)			14
Equity component of issuance of convertible notes, net of taxes (Note 5)	35		35
Balance at end of period at Jun. 30, 2019	2,064	111	2,341	(451)	(34)	97
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	(321)			(322)		1
Foreign currency translation	1				0
Stock based compensation expense	4		4
Business divestitures	(88)				3	(91)
Balance at end of period at Jun. 30, 2020	$ 1,414	$ 111	$ 2,347	$ (1,003)	$ (41)	$ 0