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Net finance costs (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of attribution of expenses by nature to their function [line items]      
Finance costs € (1,038) € (818) € (491)
Bank loans and overdrafts (82) (44) (34)
Interest on bonds and other loans (921) (673) (392)
Interest on lease liabilities (72) (72) (72)
Net gain/(loss) on transactions for which hedge accounting is not applied 37 (29) 7
Finance income 442 281 147
Pensions and similar obligations 110 44 (10)
Net finance costs (486) (493) (354)
Unwinding of discount (16) (20)  
On foreign exchange derivatives      
Disclosure of attribution of expenses by nature to their function [line items]      
Net gain/(loss) on transactions for which hedge accounting is not applied 86 123 (68)
Exchange difference on underlying items      
Disclosure of attribution of expenses by nature to their function [line items]      
Net gain/(loss) on transactions for which hedge accounting is not applied € (49) € (152) € 75