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Commitments and contingencies - Contingencies (Details) - EUR (€)
€ in Millions
1 Months Ended
Nov. 30, 2024
Sep. 30, 2024
Dec. 31, 2022
Dec. 31, 2019
Dec. 31, 2016
Dec. 31, 2014
European Commission examination on illegally received state aid | Pau, Nimes, Angouleme, Altenburg and Zweibrucken            
Commitments and contingencies            
Amount of repayments ordered by the European Commission           € 10
European Commission examination on illegally received state aid | Cagliari and Klagenfurt            
Commitments and contingencies            
Amount of repayments ordered by the European Commission         € 13  
European Commission examination on illegally received state aid | Montpellier            
Commitments and contingencies            
Amount of repayments ordered by the European Commission       € 9    
European Commission examination on illegally received state aid | La Rochelle            
Commitments and contingencies            
Amount of repayments ordered by the European Commission     € 8      
European Commission examination on illegally received state aid | Frankfurt (Hahn)            
Commitments and contingencies            
Amount of repayments ordered by the European Commission   € 14        
Spanish Ministry of Consumer Affairs, sanctioning proceedings            
Commitments and contingencies            
Fines imposed on entity € 107