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Investments in infrastructure projects from financial asset model concessions (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Infrastructure proyect long term receivables [Line Items]      
Infrastructure project receivables € 162 € 166  
Long term infrastructure project receivables [Member]      
Infrastructure proyect long term receivables [Line Items]      
Infrastructure project receivables 158 162 € 163
Increase decrease in investments in infrastructure projects receivables additions 6 9  
Increase decrease in investments in infrastructure projects receivables disposals (14) (12)  
Increase decrease in investments in infrastructure projects receivables foreign exchange rate € 3 € 2