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Note 6 - Operating Segment Reporting - Total Assets Operating Segment (Details) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Total Assets Line Items      
Assets € 676,689 € 690,059 € 731,856
Spain      
Total Assets Line Items      
Assets 354,901 350,520 368,398
United States [Member]      
Total Assets Line Items      
Assets 82,057 75,775 84,726
Turkey [Member]      
Total Assets Line Items      
Assets 66,250 78,789 84,990
Mexico [Member]      
Total Assets Line Items      
Assets 97,432 90,214 94,229
South America [Member]      
Total Assets Line Items      
Assets 54,373 75,320 77,989
Rest Of Eurasia [Member]      
Total Assets Line Items      
Assets 18,834 17,265 19,586
Subtotal [Member]      
Total Assets Line Items      
Assets 673,848 687,884 729,918
Corporate Center [Member]      
Total Assets Line Items      
Assets 2,841 2,175 1,938
Total [Member]      
Total Assets Line Items      
Assets € 676,689 € 690,059 € 731,856