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Nota 17 - Intangible assets. Impairment test hypotheses CGU Goodwill in the United States and Turkey (Details)
Mar. 31, 2020
Dec. 31, 2019
United States [Member]    
Disclosure Of Impairment Test Hypotheses Line Items    
Description Of Discount Rates Applied To Cash Flow Projections 10.30% 10.00%
Description Of Growth Rate Used To Extrapolate Cash Flow Projections 3.00% 3.50%
Turkey [Member]    
Disclosure Of Impairment Test Hypotheses Line Items    
Description Of Discount Rates Applied To Cash Flow Projections 18.10% 17.40%
Description Of Growth Rate Used To Extrapolate Cash Flow Projections 7.00% 7.00%