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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Changes In Warrants Liability [Line Items]      
Beginning balance € 98 € 333 € 346
Issuance of warrant for cash 0 15 0
Issuance of shares upon exercise of, or net settlement of, warrants (267) (303) 0
Non cash changes recognized in profit or loss      
Changes in fair value 263 35 (39)
Effect of changes in foreign exchange rates (5) 18 26
Ending balance € 89 € 98 € 333