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Note 5 Total Assets By Operating Segment (Details) - EUR (€)
Jun. 30, 2021
Dec. 31, 2020
Total Assets of the Group by business segments [Line Items]    
Assets € 648,169,000,000 € 736,176,000,000
SPAIN    
Total Assets of the Group by business segments [Line Items]    
Assets 399,180,000,000 410,409,000,000
MEXICO    
Total Assets of the Group by business segments [Line Items]    
Assets 114,501,000,000 110,236,000,000
TURKEY    
Total Assets of the Group by business segments [Line Items]    
Assets 59,243,000,000 59,585,000,000
South America [Member]    
Total Assets of the Group by business segments [Line Items]    
Assets 53,343,000,000 55,436,000,000
Rest of eurasia [Member]    
Total Assets of the Group by business segments [Line Items]    
Assets 34,364,000,000 35,172,000,000
Assets by reporting segmetns [Member]    
Total Assets of the Group by business segments [Line Items]    
Assets 660,631,000,000 670,839,000,000
Corporate Center And Adjustments [Member]    
Total Assets of the Group by business segments [Line Items]    
Assets (12,462,000,000) 65,336,000,000
Assets [member]    
Total Assets of the Group by business segments [Line Items]    
Assets € 648,169,000,000 € 736,176,000,000