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Financial Risk Management and Financial Instruments - Other Long Term Investments (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [abstract]      
At January 1 € 16 € 16 € 0
Initial recognition of long term investment 9 0 16
Changes in fair value recorded in other comprehensive income 29 0 0
Changes in fair value recognized in profit or loss (5) 0 0
At December 31 € 49 € 16 € 16