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Nota 18 - Intangible assets. Impairment test hypotheses CGU Goodwill in the United States and Turkey (Details)
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
United States [Member]      
Disclosure Of Impairment Test Hypotheses Line Items      
Description Of Discount Rates Applied To Cash Flow Projections 10.50% 10.00% 10.00%
Description Of Growth Rate Used To Extrapolate Cash Flow Projections 4.00% 4.00% 4.00%
Turkey [Member]      
Disclosure Of Impairment Test Hypotheses Line Items      
Description Of Discount Rates Applied To Cash Flow Projections 24.30% 18.00% 17.70%
Description Of Growth Rate Used To Extrapolate Cash Flow Projections 7.00% 7.00% 7.00%