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Note 11 - Retirement Plans and Other Postretirement Benefits (Details Textual) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Discontinue Operations [Member]    
Restructuring Charges $ 1 $ 1
Special Termination Benefits [Member]    
Defined Benefit Plan, Benefits Paid 1 4
Pension Plan [Member]    
Defined Benefit Plan, Contributions by Employer 4  
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease) 142  
Restructuring Charges $ 4 $ 17