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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about borrowings [line items]        
Total debt € 16,137 € 16,531 € 19,218 € 20,250
Market value        
Disclosure of detailed information about borrowings [line items]        
Total debt 8,165 7,086 5,227  
Value on redemption        
Disclosure of detailed information about borrowings [line items]        
Total debt 16,171 16,573 19,273  
Total debt at redemption € 8,806 € 7,835 € 6,492