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Derivative financial instruments and market risks - Summary of Fair Value of Derivative Instruments (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of Credit Risk Exposure [Line Items]      
Non-current assets € 0 € 0 € 3
Current assets 201    
Total assets 201    
Non-current liabilities (164) (232) (6)
Current liabilities (127)    
Total liabilities (291)    
Market value (90) (120) 213
Currency derivatives      
Disclosure of Credit Risk Exposure [Line Items]      
Non-current assets 0    
Current assets 201    
Total assets 201    
Non-current liabilities 0    
Current liabilities (126)    
Total liabilities (126)    
Market value 75 112 222
operating      
Disclosure of Credit Risk Exposure [Line Items]      
Non-current assets 0    
Current assets 67    
Total assets 67    
Non-current liabilities 0    
Current liabilities (45)    
Total liabilities (45)    
Market value 22 22 10
financial      
Disclosure of Credit Risk Exposure [Line Items]      
Non-current assets 0    
Current assets 134    
Total assets 134    
Non-current liabilities 0    
Current liabilities (81)    
Total liabilities (81)    
Market value 53 90 212
Interest rate derivatives      
Disclosure of Credit Risk Exposure [Line Items]      
Non-current assets 0    
Current assets 0    
Total assets 0    
Non-current liabilities (164)    
Current liabilities (1)    
Total liabilities (165)    
Market value (165) (232) 7
Equity derivatives      
Disclosure of Credit Risk Exposure [Line Items]      
Non-current assets 0    
Current assets 0    
Total assets 0    
Non-current liabilities 0    
Current liabilities 0    
Total liabilities 0    
Market value € 0 € 0 € (16)