Note 18 - Other Post Retirement Benefit Cost from Continuing Operations (Details) - Other Postretirement Benefit Plans [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Components of net postretirement benefit cost:
Interest cost	$ 2	$ 2	$ 3
Amortization of:
Actuarial loss	$ (2)	$ (2)
Net pension income			$ 3