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Related party transactions - Schedule of Compensation Paid to Key Management Personnel (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of compensation paid to key management personnel [abstract]      
Short-term benefits € 31 € 33 € 36
Post-employment benefits 2 2 3
Share-based payment 19 20 18
Total recognized in profit or loss € 52 € 55 € 57