Note 21 - Amounts Recognized in the Consolidated Statement of Financial Position (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Amounts Recognized In Consolidated Statement Of Financial Position [Line Items]
Pension and other postretirement liabilities	$ (378)	$ (379)
Other Postretirement Benefits Plan [Member]
Amounts Recognized In Consolidated Statement Of Financial Position [Line Items]
Other current liabilities	(3)	(3)
Pension and other postretirement liabilities	(60)	(61)
Other benefit plan liabilities	$ (63)	$ (64)