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Note 17 - Other Post Retirement Benefit Cost from Continuing Operations (Details) - Other Postretirement Benefit Plans [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Components of net postretirement benefit cost:      
Interest cost $ 2 $ 3 $ 4
Amortization of:      
Actuarial loss $ (2)    
Net pension income   $ 3 $ 4