Note 3 - Inventories (Details Textual) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019
Inventory, LIFO Reserve, Period Charge	$ 14	$ 22
Inventory Write-down		34	$ 0
UNITED STATES
Inventory Write-down		19
CANADA
Inventory Write-down		1
International [Member]
Inventory Write-down		$ 14