v3.26.1
Investments - Summary of goodwill of the main investments in joint ventures and associates (Details) - EUR (€)
€ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of associates [line items]        
Goodwill € 11,958 € 13,438 € 14,017 € 13,741
Zurich Santander Insurance America, S.L. - Consolidated        
Disclosure of associates [line items]        
Goodwill 526 526 526  
Pluxee Beneficios Brasil, S.A.        
Disclosure of associates [line items]        
Goodwill 71 € 122 0  
Percentage of voting equity interests acquired   20.00%    
Caceis (Notes 3 and 12)        
Disclosure of associates [line items]        
Goodwill 0 € 0 337  
Associates and joint ventures        
Disclosure of associates [line items]        
Goodwill € 1,096 € 1,238 € 1,460