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Note 7 - Income Tax (Details Textual) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement Line Items [Line Items]      
After tax effect of expense not deductible in determining profit (loss) $ 66 $ 65  
Charge related to withholding taxes for intra group international operations $ 34 $ 26  
ARGENTINA      
Statement Line Items [Line Items]      
Deferred tax expense (income) relating to tax rate changes or imposition of new taxes     $ (46)
UNITED STATES      
Statement Line Items [Line Items]      
Deferred tax expense (income) relating to tax rate changes or imposition of new taxes     $ (15)