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Related party transactions (Tables)
12 Months Ended
Dec. 31, 2020
Disclosure of transactions between related parties [abstract]  
Summary of Related Party Transactions The disclosure amounts are based on the expense recognized in the consolidated statement of operations in the respective year.
202020192018
(in € millions)
Key management compensation
Short term employee benefits
Share-based compensation30 22 19 
Termination benefits— — 
35 27 24