Consolidated Statement of Equity (Deficit) (Unaudited) - USD ($) $ in Millions	Total	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]	Redeemable Convertible Preferred Stock [Member]	Convertible Redeemable Series B Preferred Stock [Member]	Convertible Redeemable Series C Preferred Stock [Member]	Series A [Member]	Series A [Member] Additional Paid-in Capital [Member]
Equity (deficit) at Dec. 31, 2019	$ 99	$ 604	$ (79)	$ (417)	$ (9)
Equity (deficit) at Dec. 31, 2019						$ 182
Net income (loss)	(111)		(111)
Currency translation adjustments	(12)			(12)
Pension and other postretirement liability adjustments	3			3
Preferred stock cash dividends	(3)								$ (3)	$ (3)
Preferred stock deemed dividends	(2)								(2)	$ (2)
Redeemable preferred stock deemed dividends						(2)
Stock-based compensation	1	1
Equity (deficit) at Mar. 31, 2020	(25)	600	(190)	(426)	(9)
Equity (deficit) at Mar. 31, 2020						184
Equity (deficit) at Dec. 31, 2020	77	1,152	(620)	(446)	(9)
Equity (deficit) at Dec. 31, 2020	191					191			$ 191
Net income (loss)	6		6
Currency translation adjustments	(1)			(1)
Pension and other postretirement liability adjustments	6			6
Repurchase of Redeemable Convertible Preferred Stock						(100)
Exchange of Series A preferred stock	92	92				(92)
Expiration of Series A preferred stock embedded derivative	11	11
Issuance of convertible, redeemable Series B preferred stock, net	(95)	(95)
Issuance of convertible, redeemable preferred stock, net of offering costs							$ 93	$ 97
Issuance of common stock	10	10
Preferred stock cash dividends	(1)	(1)
Preferred stock deemed dividends	(2)	(2)
Redeemable preferred stock deemed dividends						(2)
Series C Preferred stock in-kind dividends	(1)	(1)
Redeemable preferred stock in-kind dividends						1
Purchase of treasury stock	(1)				(1)
Stock-based compensation	3	3
Equity (deficit) at Mar. 31, 2021	104	$ 1,169	$ (614)	$ (441)	$ (10)
Equity (deficit) at Mar. 31, 2021	$ 192					$ 192