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Related Party Transaction - Summary of Related Party Transactions (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Key management compensation      
Short term employee benefits € 4 € 5 € 5
Share-based compensation 26 30 22
Total key management compensation € 30 € 35 € 27