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Non-current assets investment in infraestructure projects (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Noncurrent assets [Table]      
Investments in infrastructure projects subtotal € 14,147 € 13,495 € 13,667
Increase decrease in investments in infrastructure projects additions   695  
Increase decrease in investments in infrastructure projects depreciation (235) (235)  
Increase decrease in investments in infrastructure projects disposals (14) (4)  
Increase decrease in investments in infrastructure projects exchange rate 814 (374)  
Increase decrease in investments in infrastructure projects changes in the scope of consolidation and others € 0 € (254)