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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 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Benefits Costs for Postretirement Benefit Plans [Abstract]        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 1 1 2 3
Total net postretirement benefit expense $ 1 $ 1 $ 2 $ 3