Note 13 - Restructuring Liabilities (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2018
Restructuring Cost And Reserve [Line Items]
Beginning Balance		$ 8	$ 10	$ 10
Charges		2	2
Utilization/cash payments		(5)	(4)
Other adjustments and reclasses	[1]	(1)
Ending Balance		4	8	4
Severance Reserve [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance	[2]	4	6	6
Charges	[2]	2	2
Utilization/cash payments	[2]	(3)	(4)
Other adjustments and reclasses	[1],[2]	(1)
Ending Balance	[2]	2	4	2
Exit Costs Reserve [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance	[2]	4	4	4
Utilization/cash payments	[2]	(2)
Ending Balance	[2]	$ 2	$ 4	$ 2

[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.