Consolidated Statement of Equity (Deficit) (Unaudited) - USD ($) $ in Millions	Total	ASU 2016-02 [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Deficit [Member] ASU 2016-02 [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]	Series A Redeemable Convertible Preferred Stock [Member]
Equity (deficit) at Dec. 31, 2018	$ (3)		$ 617	$ (200)		$ (411)	$ (9)
Equity (deficit) at Dec. 31, 2018								$ 173
Net (loss) income	(18)			(18)
Currency translation adjustments	3					3
Pension and other postretirement liability adjustments	(1)					(1)
Series A preferred stock cash dividends	(3)		(3)
Series A preferred stock deemed dividends	(2)		(2)
Redeemable series A preferred stock deemed dividends								(2)
Stock-based compensation	3		3
Equity (deficit) at Mar. 31, 2019	(16)	$ 5	615	(213)	$ 5	(409)	(9)
Accounting Standards Update [Extensible List]		us-gaap:AccountingStandardsUpdate201602Member			us-gaap:AccountingStandardsUpdate201602Member
Equity (deficit) at Mar. 31, 2019								175
Equity (deficit) at Dec. 31, 2018	(3)		617	(200)		(411)	(9)
Equity (deficit) at Dec. 31, 2018								173
Net (loss) income	178
Series A preferred stock cash dividends	(8)
Series A preferred stock deemed dividends	(7)
Equity (deficit) at Sep. 30, 2019	171		608	(17)		(411)	(9)
Equity (deficit) at Sep. 30, 2019								180
Equity (deficit) at Mar. 31, 2019	(16)	$ 5	615	(213)	$ 5	(409)	(9)
Equity (deficit) at Mar. 31, 2019								175
Net (loss) income	201			201
Currency translation adjustments	1					1
Series A preferred stock cash dividends	(3)		(3)
Series A preferred stock deemed dividends	(2)		(2)
Redeemable series A preferred stock deemed dividends								(2)
Stock-based compensation	2		2
Equity (deficit) at Jun. 30, 2019	183		612	(12)		(408)	(9)
Equity (deficit) at Jun. 30, 2019								177
Net (loss) income	(5)			(5)
Currency translation adjustments	(2)					(2)
Pension and other postretirement liability adjustments	(1)					(1)
Series A preferred stock cash dividends	(2)		(2)
Series A preferred stock deemed dividends	(3)		(3)
Redeemable series A preferred stock deemed dividends								(3)
Stock-based compensation	1		1
Equity (deficit) at Sep. 30, 2019	171		608	(17)		(411)	(9)
Equity (deficit) at Sep. 30, 2019								180
Equity (deficit) at Dec. 31, 2019	99		604	(79)		(417)	(9)
Equity (deficit) at Dec. 31, 2019								182
Net (loss) income	(111)			(111)
Currency translation adjustments	(12)					(12)
Pension and other postretirement liability adjustments	3					3
Series A preferred stock cash dividends	(3)		(3)
Series A preferred stock deemed dividends	(2)		(2)
Redeemable series A 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, 2019	99		604	(79)		(417)	(9)
Equity (deficit) at Dec. 31, 2019								182
Net (loss) income	(561)
Series A preferred stock cash dividends	(8)
Series A preferred stock deemed dividends	(7)
Equity (deficit) at Sep. 30, 2020	88		1,156	(640)		(419)	(9)
Equity (deficit) at Sep. 30, 2020								189
Equity (deficit) at Mar. 31, 2020	(25)		600	(190)		(426)	(9)
Equity (deficit) at Mar. 31, 2020								184
Net (loss) income	(5)			(5)
Currency translation adjustments	(4)					(4)
Pension and other postretirement liability adjustments	9					9
Series A preferred stock cash dividends	(3)		(3)
Series A preferred stock deemed dividends	(2)		(2)
Redeemable series A preferred stock deemed dividends								(2)
Equity (deficit) at Jun. 30, 2020	(30)		595	(195)		(421)	(9)
Equity (deficit) at Jun. 30, 2020								186
Net (loss) income	(445)			(445)
Currency translation adjustments	(1)					(1)
Pension and other postretirement liability adjustments	3					3
Series A preferred stock cash dividends	(2)		(2)
Series A preferred stock deemed dividends	(3)		(3)
Redeemable series A preferred stock deemed dividends								(3)
Conversion of Convertible Notes	520		520
Stock options exercised	29		29
Stock-based compensation	17		17
Equity (deficit) at Sep. 30, 2020	$ 88		$ 1,156	$ (640)		$ (419)	$ (9)
Equity (deficit) at Sep. 30, 2020								$ 189