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Note 12 - Retirement Plans and Other Postretirement Benefits (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]        
Restructuring Charges $ 1 $ 6 $ 12 $ 28
Pension Plan [Member]        
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]        
Defined Benefit Plan, Contributions by Employer     13  
Defined benefit plan, benefit obligation, period increase (decrease)     $ 146  
Discontinue Operations [Member]        
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]        
Restructuring Charges       $ 1