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Loss per share - Summary of Computation of Loss Per Share (Details) - EUR (€)
€ / shares in Units, € in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Basic loss per share      
Net loss attributable to owners of the parent € (34) € (581) € (186)
Weighted-average ordinary shares outstanding (in shares) 191,298,397 187,583,307 180,960,579
Basic net loss per share attributable to owners of the parent (euro per share) € (0.18) € (3.10) € (1.03)
Diluted loss per share      
Net loss attributable to owners of the parent € (34) € (581) € (186)
Fair value gains on dilutive Exchangeable Notes (112) 0 0
Fair value gains on dilutive warrants (53) 0 0
Net loss used in the computation of diluted loss per share € (199) € (581) € (186)
Weighted-average ordinary shares outstanding      
Weighted-average ordinary shares outstanding (in shares) 191,298,397 187,583,307 180,960,579
Exchangeable Notes (in shares) 2,424,921 0 0
Warrants (in shares) 220,137 0 0
Diluted weighted average ordinary shares (in shares) 193,943,455 187,583,307 180,960,579
Diluted (euro per share) € (1.03) € (3.10) € (1.03)