Consolidated Statement of Equity (Deficit) - 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)	$ 5	$ 617	$ (200)	$ 5	$ (411)	$ (9)
Equity (deficit) at Dec. 31, 2018								$ 173
Net (loss) earnings	116			116
Accounting Standards Update Extensible List		us-gaap:AccountingStandardsUpdate201602Member			us-gaap:AccountingStandardsUpdate201602Member
Currency translation adjustments	6					6
Pension and other postretirement liability adjustments	(12)					(12)
Series A preferred stock cash and accrued dividends	(11)		(11)
Series A preferred stock deemed dividends	(9)		(9)
Redeemable series A preferred stock deemed dividends								(9)
Stock-based compensation	7		7
Equity (deficit) at Dec. 31, 2019	99		604	(79)		(417)	(9)
Equity (deficit) at Dec. 31, 2019								182
Net (loss) earnings	(541)			(541)
Currency translation adjustments	(16)					(16)
Pension and other postretirement liability adjustments	(13)					(13)
Series A preferred stock cash and accrued dividends	(11)		(11)
Series A preferred stock deemed dividends	(9)		(9)
Redeemable series A preferred stock deemed dividends								(9)
Conversion of Convertible Notes	520		520
Stock option exercises	29		29
Stock-based compensation	19		19
Equity (deficit) at Dec. 31, 2020	$ 77		$ 1,152	$ (620)		$ (446)	$ (9)
Equity (deficit) at Dec. 31, 2020								$ 191