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Financial risk management - Narrative (Details) - Currency risk
€ in Millions
12 Months Ended
Dec. 31, 2023
EUR (€)
Dec. 31, 2022
EUR (€)
Risk management    
Percentage of confidence level to determine value at risk 95.00%  
Probability percentage that potential loss not exceed value at risk 95.00%  
Probability percentage that potential loss will be at minimum equal to value at risk 5.00%  
Confidence level that potential loss not exceed value at risk 95.00%  
Non-current restricted cash and cash equivalents € 119 € 122
Cash flow hedges    
Risk management    
Hedge ratio 1  
Fair value hedges    
Risk management    
Hedge ratio 1  
Hedges on net investment in foreign subsidiaries    
Risk management    
Hedge ratio 1