Note 18 - Segments - Reconciliation of Segment EBITDA to Consolidated Net Income (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment EBITDA	$ 204		$ 253		$ 407	$ 802
Corporate expense and other items, net	(3)		(3)		(6)	(9)
Depreciation	(88)		(82)		(257)	(235)
Amortization	(6)		(4)		(15)	(12)
Non-service cost components of pension and OPEB costs	(3)		(4)		(8)	(19)
Restructuring charges, net	(2)		(5)		(21)	(23)
Stock compensation expense	(2)		(5)		(5)	(15)
Strategic transaction expenses	(4)		(8)		(15)	(32)
Impairment		$ (51)			(51)
Acquisition related inventory adjustments			(3)			(12)
Non-income tax legal judgment						6
Other items	(7)				(5)	(9)
Pension settlement charge			(2)	$ (258)		(260)
Earnings before interest and income taxes	89		137		24	182
Write-off deferred financing costs					(5)
Interest income	3		3		7	8
Interest expense	38		31		99	92
Earnings (loss) before income taxes	54		109		(73)	98
Income tax expense (benefit)	16		5		34	(27)
Equity in earnings of affiliates	7		8		17	22
Net income (loss)	$ 45	$ 38	$ 112		$ (90)	$ 147