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Note 17 - Major Funded and Unfunded Defined Benefit Plans (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Change in Benefit Obligation      
Special termination benefits $ 13 $ 3 $ 9
U.S. [Member]      
Change in Benefit Obligation      
Projected benefit obligation at beginning of period 3,908 4,099  
Service cost 12 12 17
Interest cost 115 113 148
Benefit payments (352) (395)  
Actuarial loss 170 76  
Special termination benefits 13 3  
Projected benefit obligation at end of period 3,866 3,908 4,099
Change in Plan Assets      
Fair value of plan assets at beginning of period 3,653 3,793  
Gain on plan assets 503 255  
Benefit payments (352) (395)  
Fair value of plan assets at end of period 3,804 3,653 3,793
Under Funded Status at end of period (62) (255)  
Accumulated benefit obligation at end of period 3,864 3,907  
Non-US [Member]      
Change in Benefit Obligation      
Projected benefit obligation at beginning of period 816 800  
Service cost 3 3 3
Interest cost 12 14 17
Benefit payments (48) (48)  
Actuarial loss 37 61  
Currency adjustments 65 (14)  
Projected benefit obligation at end of period 885 816 800
Change in Plan Assets      
Fair value of plan assets at beginning of period 693 728  
Gain on plan assets 27 19  
Employer contributions 5 4  
Benefit payments (48) (48)  
Currency adjustments 45 (10)  
Fair value of plan assets at end of period 722 693 $ 728
Under Funded Status at end of period (163) (123)  
Accumulated benefit obligation at end of period $ 874 $ 806