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Financial Risk Management and Financial Instruments - Summary of Changes in Warrants Liability (Details) - Warrants - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Changes In Warrants Liability [Line Items]      
Beginning balance € 89 € 98 € 333
Issuance of warrant for cash 31 0 15
Issuance of shares upon exercise of, or net settlement of, warrants 0 (267) (303)
Non cash changes recognized in profit or loss      
Changes in fair value recognized in consolidated statement of operations (53) 263 35
Effect of changes in foreign exchange rates 5 (5) 18
Ending balance € 72 € 89 € 98