Note 18 - Restructuring Costs and Other - Restructuring Liabilities (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restructuring Cost And Reserve [Line Items]
Beginning Balance		$ 11	$ 12	$ 8
Charges		6	17	16
Utilization/cash payments		(10)	(15)	(9)
Other adjustments & reclasses	[1]	(2)	(3)	(3)
Ending Balance		5	11	12
Severance Reserve [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance	[2]	10	11	6
Charges	[2]	6	16	16
Utilization/cash payments	[2]	(10)	(14)	(8)
Other adjustments & reclasses	[1],[2]	(2)	(3)	(3)
Ending Balance	[2]	4	10	11
Exit Costs Reserve [Member]
Restructuring Cost And Reserve [Line Items]
Beginning Balance	[2]	1	1	2
Charges	[2]		1
Utilization/cash payments	[2]		(1)	(1)
Ending Balance	[2]	$ 1	$ 1	$ 1

[1] The $2 million in 2021 and the $3 million in both 2020 and 2019 represented 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.  Any long-lived asset impairments and inventory write-downs would represent non-cash items.