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Note 12 - Retirement Plans and Other Postretirement Benefits (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]          
Restructuring Charges $ 7   $ 5 $ 11 $ 22
Pension Plan [Member]          
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]          
Defined Benefit Plan, Contributions by Employer       7  
Defined benefit plan, benefit obligation, period increase (decrease)   $ 142      
Discontinue Operations [Member]          
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]          
Restructuring Charges $ 1   $ 1 $ 1 $ 1