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Note 6 Total Group assets by operating segments (Details) - EUR (€)
€ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Total Assets of the Group by business segments [Line Items]      
Assets € 662,885 € 733,797 € 695,471
SPAIN      
Total Assets of the Group by business segments [Line Items]      
Assets 413,477 408,030 [1] 367,678 [1]
MEXICO      
Total Assets of the Group by business segments [Line Items]      
Assets 118,106 110,236 [1] 109,087 [1]
TURKEY      
Total Assets of the Group by business segments [Line Items]      
Assets 56,245 59,585 [1] 64,416 [1]
South America [Member]      
Total Assets of the Group by business segments [Line Items]      
Assets 56,124 55,436 [1] 54,996 [1]
Rest of business [Member]      
Total Assets of the Group by business segments [Line Items]      
Assets 40,314 35,172 [1] 32,891 [1]
Subtotal assets by operating segments [Member]      
Total Assets of the Group by business segments [Line Items]      
Assets 684,266 668,460 [1] 629,068 [1]
Corporate Center And Adjustments [Member]      
Total Assets of the Group by business segments [Line Items]      
Assets (21,381) 65,336 [1] 66,403 [1]
Assets [member]      
Total Assets of the Group by business segments [Line Items]      
Assets € 662,885 € 733,797 [1] € 695,471 [1]
[1] (*) The figures corresponding to 2020 and 2019 have been restated.