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Debt, cash and cash equivalents and lease liabilities - Summary of Market Value of Net Debt (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about borrowings [line items]        
Total debt € 16,531 € 19,218 € 20,250 € 22,631
Market value        
Disclosure of detailed information about borrowings [line items]        
Total debt 7,086 5,227 11,024  
Value on redemption        
Disclosure of detailed information about borrowings [line items]        
Total debt 16,573 19,273 20,314  
Total debt at redemption € 7,835 € 6,492 € 10,047