Note 18 - Amounts Recognized in the Consolidated Statement of Financial Position (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Amounts Recognized In Consolidated Statement Of Financial Position [Line Items]
Pension and other postretirement liabilities	$ (466)	$ (603)
Other Postretirement Benefit Plans [Member]
Amounts Recognized In Consolidated Statement Of Financial Position [Line Items]
Other current liabilities	(5)	(5)
Pension and other postretirement liabilities	(69)	(69)
Other benefit plan liabilities	$ (74)	$ (74)