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Note 9 - Retirement Plans and Other Postretirement Benefits (Details) - Benefits Costs for Postretirement Benefit Plans - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Benefits Costs for Postretirement Benefit Plans [Abstract]      
Interest cost $ 1 $ 1 $ 2
Total net postretirement benefit expense $ 1 $ 1 $ 2