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Derivative financial instruments and market risks - Summary of Fair Value of Derivative Instruments (Details) - EUR (€)
€ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of Credit Risk Exposure [Line Items]      
Non-current assets € 0 € 3 € 24
Current assets 206    
Total assets 206    
Non-current liabilities (232) (6) (92)
Current liabilities (94)    
Total liabilities (326)    
Market value (120) 213 (215)
Currency derivatives      
Disclosure of Credit Risk Exposure [Line Items]      
Non-current assets 0    
Current assets 206    
Total assets 206    
Non-current liabilities 0    
Current liabilities (94)    
Total liabilities (94)    
Market value 112 222 (209)
operating      
Disclosure of Credit Risk Exposure [Line Items]      
Non-current assets 0    
Current assets 88    
Total assets 88    
Non-current liabilities 0    
Current liabilities (66)    
Total liabilities (66)    
Market value 22 10 7
financial      
Disclosure of Credit Risk Exposure [Line Items]      
Non-current assets 0    
Current assets 118    
Total assets 118    
Non-current liabilities 0    
Current liabilities (28)    
Total liabilities (28)    
Market value 90 212 (216)
Interest rate derivatives      
Disclosure of Credit Risk Exposure [Line Items]      
Non-current assets 0    
Current assets 0    
Total assets 0    
Non-current liabilities (232)    
Current liabilities 0    
Total liabilities (232)    
Market value (232) 7 20
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 € (16) € (26)