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Net financial income/(expense) - Narrative (Details) - EUR (€)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Finance income [Line Items]      
Financial assets at value of changes in results € 574,000,000 € 11,000,000 € 47,000,000
FGP Topco limited [Member]      
Finance income [Line Items]      
Percentage of the sale of the FGP Topco 19.75%    
Airports division [Member]      
Finance income [Line Items]      
Financial assets at value of changes in results € 547,000,000    
Recognition of financial assets at fair value through profit or loss of other assets € 0.0525    
Airports division [Member] | FGP Topco limited [Member]      
Finance income [Line Items]      
Percentage of the sale of the FGP Topco 19.75%