v3.26.1
Other comprehensive income - Schedule of changes in fair value of equity instruments that will not be reclassified (Details) - EUR (€)
€ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of analysis of other comprehensive income by item [line items]        
Net gains/losses by valuation € (250) € (432) € (776)  
Financial assets at fair value through other comprehensive income 74,612 89,898 83,308  
Equity instruments        
Disclosure of analysis of other comprehensive income by item [line items]        
Capital gains by valuation 1,158 967 535  
Capital losses by valuation (1,408) (1,399) (1,311)  
Net gains/losses by valuation (250) (432) (776)  
Financial assets at fair value through other comprehensive income 2,281 2,193 1,761 € 1,941
Domestic | Spain        
Disclosure of analysis of other comprehensive income by item [line items]        
Capital gains by valuation 47 39 32  
Capital losses by valuation (1,326) (1,328) (1,173)  
Net gains/losses by valuation (1,279) (1,289) (1,141)  
Financial assets at fair value through other comprehensive income 133 117 252  
International | Rest of Europe        
Disclosure of analysis of other comprehensive income by item [line items]        
Capital gains by valuation 75 131 117  
Capital losses by valuation (81) (71) (71)  
Net gains/losses by valuation (6) 60 46  
Financial assets at fair value through other comprehensive income 186 299 267  
International | US        
Disclosure of analysis of other comprehensive income by item [line items]        
Capital gains by valuation 23 22 16  
Capital losses by valuation (1) 0 0  
Net gains/losses by valuation 22 22 16  
Financial assets at fair value through other comprehensive income 36 24 19  
International | Latin America and rest        
Disclosure of analysis of other comprehensive income by item [line items]        
Capital gains by valuation 1,013 775 370  
Capital losses by valuation 0 0 (67)  
Net gains/losses by valuation 1,013 775 303  
Financial assets at fair value through other comprehensive income 1,926 1,753 1,223  
Publicly listed        
Disclosure of analysis of other comprehensive income by item [line items]        
Capital gains by valuation 1,033 779 316  
Capital losses by valuation (49) (51) (118)  
Net gains/losses by valuation 985 728 198  
Financial assets at fair value through other comprehensive income 1,993 1,780 1,225  
Non publicly listed        
Disclosure of analysis of other comprehensive income by item [line items]        
Capital gains by valuation 125 188 219  
Capital losses by valuation (1,359) (1,348) (1,193)  
Net gains/losses by valuation (1,235) (1,160) (974)  
Financial assets at fair value through other comprehensive income € 288 € 413 € 536