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Related party transactions - GLT (Details) - Group Leadership Team - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Related party transactions      
Short-term benefits € 20 € 27 € 24
Post-employment benefits 2 2 1
Share-based payment 12 9 8
Termination benefits   10  
Total € 34 € 48 € 33