v3.10.0.1
Segment Information - Summary of Reconciliation Between Reportable Segment Gross Profit and Loss to Consolidated Loss Before Tax (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Operating Segments [Abstract]      
Segment gross profit € 1,353 € 849 € 401
Research and development (493) (396) (207)
Sales and marketing (620) (567) (368)
General and administrative (283) (264) (175)
Finance income 455 118 152
Finance costs (584) (974) (336)
Share in (losses)/earnings of associate (1) 1 (2)
Loss before tax € (173) € (1,233) € (535)