Note 13 - Restructuring Liabilities (Details) - USD ($) $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2018
Restructuring Cost And Reserve [Line Items]
Beginning Balance		$ 4	$ 8	$ 10	$ 10
Charges		9	2	2	13
Utilization/cash payments		(2)	(5)	(4)
Other adjustments and reclasses	[1]	(3)	(1)
Ending Balance		8	4	8	8
Severance Reserve [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance	[2]	2	4	6	6
Charges	[2]	9	2	2
Utilization/cash payments	[2]	(2)	(3)	(4)
Other adjustments and reclasses	[1],[2]	(3)	(1)
Ending Balance	[2]	6	2	4	6
Exit Costs Reserve [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance	[2]	2	4	4	4
Utilization/cash payments	[2]		(2)
Ending Balance	[2]	$ 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.