Note 18 - Segments - Reconciliation of Segment EBITDA to Consolidated Net Income (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment EBITDA	$ (3)		$ 290	$ 203	$ 549
Corporate expense and other items, net	(2)		(4)	(3)	(6)
Depreciation	(84)		(79)	(169)	(153)
Amortization	(5)		(5)	(9)	(8)
Non-service cost components of pension and OPEB costs	(3)		(9)	(5)	(15)
Restructuring charges, net	(16)		(9)	(19)	(18)
Stock compensation credit	1
Stock compensation expense			(5)	(3)	(10)
Strategic transaction expenses	(5)		(11)	(11)	(24)
Impairment		$ (51)		(51)
Acquisition related inventory adjustments			(5)		(9)
Non-income tax legal judgment					6
Other income	5			2
Other items					(9)
Pension settlement charge			(258)		(258)
Earnings (loss) before interest and income taxes	(112)		(95)	(65)	45
Write-off deferred financing costs	(5)			(5)
Interest income	2		3	4	5
Interest expense	32		34	61	61
Loss before income taxes	(147)		(126)	(127)	(11)
Income tax expense (benefit)	34		(52)	18	(32)
Equity in earnings of affiliates	8		8	10	14
Net income (loss)	$ (173)	$ 38	$ (66)	$ (135)	$ 35