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Financial Risk Management and Financial Instruments - Summary of Changes in Convertible Notes (Details)
€ in Millions
12 Months Ended
Dec. 31, 2018
EUR (€)
Disclosure of detailed information about financial instruments [abstract]  
Beginning balance € 944
Changes in fair value 221
Effect of changes in foreign exchange rates (20)
Issuance of shares upon exchange of Convertible Notes (1,145)
Ending balance € 0