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Related party transactions - Schedule of Compensation Paid to Key Management Personnel (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of compensation paid to key management personnel [abstract]      
Short-term benefits € 36 € 31 € 33
Post-employment benefits 2 2 2
Share-based payment 8 19 20
Total recognized in profit or loss € 46 € 52 € 55