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Note 17 - Component of the Net Periodic benefit Cost - (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Pension Income Expense From Continuing And Discontinued Operations For Major Defined Benefit Plans [Line Items]        
Total net pension cost (income)     $ (45) $ (54)
Defined Benefit Plans [Member] | U.S. [Member]        
Pension Income Expense From Continuing And Discontinued Operations For Major Defined Benefit Plans [Line Items]        
Service cost $ 2 $ 3 5 6
Interest cost 31 27 61 55
Expected return on plan assets (54) (56) (107) (112)
Prior service credit (1) (2) (3) (4)
Actuarial loss   2   3
Net pension income before special termination benefits (22) (26) (44) (52)
Special termination benefits 1 1 2 1
Curtailment (gain) (2)   (2)  
Net pension income from major plans (23) (25) (44) (51)
Total net pension cost (income) (23) (25) (44) (51)
Defined Benefit Plans [Member] | Non-US [Member]        
Pension Income Expense From Continuing And Discontinued Operations For Major Defined Benefit Plans [Line Items]        
Service cost 1 1 2 2
Interest cost 3 3 6 6
Expected return on plan assets (5) (6) (11) (13)
Actuarial loss 1 1 2 2
Net pension income before special termination benefits   (1) (1) (3)
Net pension income from major plans   (1) (1) (3)
Other plans (3)   (4)  
Total net pension cost (income) $ (3) $ (1) $ (5) $ (3)