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Note 16 Investments In Subsidiaries Joint Ventures And Associates (Details) - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of Investments in subsidiaries joint ventures and associates [Line Items]        
Investments in joint ventures € 94 € 93 € 100  
Investments in associates 895 883 816  
Investments in subsidiaries, joint ventures and associates 989 976 916 € 900
Altura markets SV SA [Member]        
Disclosure of Investments in subsidiaries joint ventures and associates [Line Items]        
Investments in joint ventures 38 31 42  
RCI Colombia [Member]        
Disclosure of Investments in subsidiaries joint ventures and associates [Line Items]        
Investments in joint ventures 37 40 36  
Other joint ventures [Member]        
Disclosure of Investments in subsidiaries joint ventures and associates [Line Items]        
Investments in joint ventures 19 22 22  
Metrovacesa SA [Member]        
Disclosure of Investments in subsidiaries joint ventures and associates [Line Items]        
Investments in associates 300 259 259  
BBVA allianz seguros y reaseguros SA [Member]        
Disclosure of Investments in subsidiaries joint ventures and associates [Line Items]        
Investments in associates 265 251 248  
ATOM Bank PLC [Member]        
Disclosure of Investments in subsidiaries joint ventures and associates [Line Items]        
Investments in associates 222 211 132  
Redsys servicios de procesamiento SL [Member]        
Disclosure of Investments in subsidiaries joint ventures and associates [Line Items]        
Investments in associates 20 22 20  
Servicios electronicos globales SA de CV [Member]        
Disclosure of Investments in subsidiaries joint ventures and associates [Line Items]        
Investments in associates 43 36 23  
Other associates [Member]        
Disclosure of Investments in subsidiaries joint ventures and associates [Line Items]        
Investments in associates € 45 € 105 € 134