Note 16 - Restructuring Reserve Activity (Details) - USD ($) $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2019
Restructuring Cost And Reserve [Line Items]
Beginning Balance		$ 7	$ 7	$ 8	$ 8
Charges		3		2
Utilization/cash payments		(3)	(2)	(2)
Other adjustments and reclasses	[1]		(1)	(1)
Ending Balance		7	7	7	7
Continuing Operations [Member]
Restructuring Cost And Reserve [Line Items]
Charges			2
Discontinued Operations [Member]
Restructuring Cost And Reserve [Line Items]
Charges			1		1
Severance Reserve [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance	[2]	5	5	6	6
Charges	[2]	3		2
Utilization/cash payments	[2]	(2)	(2)	(2)
Other adjustments and reclasses	[1],[2]		(1)	(1)
Ending Balance	[2]	6	5	5	6
Severance Reserve [Member] | Continuing Operations [Member]
Restructuring Cost And Reserve [Line Items]
Charges	[2]		2
Severance Reserve [Member] | Discontinued Operations [Member]
Restructuring Cost And Reserve [Line Items]
Charges	[2]		1
Exit Costs Reserve [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance	[2]	2	2	2	2
Utilization/cash payments	[2]	(1)
Ending Balance	[2]	$ 1	$ 2	$ 2	$ 1

[1] Represents severance charges funded from pension plan assets, which were reclassified to Pension and other postretirement liabilities.

[2] The severance and exit costs reserves require the outlay of cash, while long-lived asset impairments and inventory write-downs represent non-cash items.