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Note 6 - Operating Segment Reporting - Total Assets Operating Segment (Details) - EUR (€)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Total Assets Line Items      
Assets € 736,176,000,000 € 697,737,000,000 € 675,675,000,000
Spain [Member]      
Total Assets Line Items      
Assets 405,878,000,000 364,427,000,000 353,923,000,000
United States [Member]      
Total Assets Line Items      
Assets 93,953,000,000 88,529,000,000 82,057,000,000
Mexico [Member]      
Total Assets Line Items      
Assets 110,224,000,000 109,079,000,000 97,432,000,000
Turkey [Member]      
Total Assets Line Items      
Assets 59,585,000,000 64,416,000,000 66,250,000,000
South America [Member]      
Total Assets Line Items      
Assets 55,435,000,000 54,996,000,000 54,373,000,000
Rest Of Eurasia [Member]      
Total Assets Line Items      
Assets 22,881,000,000 23,257,000,000 18,845,000,000
Subtotal [Member]      
Total Assets Line Items      
Assets 747,957,000,000 704,703,000,000 672,880,000,000
Corporate Center and other adjustments [Member]      
Total Assets Line Items      
Assets € (11,781,000,000) € (6,967,000,000) € 2,796,000,000