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Financial Risk Management and Financial Instruments - Other Long Term Investments (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about financial instruments [abstract]      
At January 1 € 49 € 16 € 16
Initial recognition of long term investment 2 9 0
Changes in fair value recorded in other comprehensive (loss)/income 158 29 0
Changes in fair value recognized in consolidated statement of operations (4) (4) 0
Sale of long term investment (144) 0 0
Effect of changes in foreign exchange rates 3 (1) 0
At December 31 € 64 € 49 € 16