v3.10.0.1
Segment Information - Summary of Revenue by Geographic Area (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Operating Segments [Line Items]      
Revenue € 5,259 € 4,090 € 2,952
United States      
Disclosure Of Operating Segments [Line Items]      
Revenue 1,973 1,577 1,173
United Kingdom      
Disclosure Of Operating Segments [Line Items]      
Revenue 576 444 342
Luxembourg      
Disclosure Of Operating Segments [Line Items]      
Revenue 3 3 1
Other Countries      
Disclosure Of Operating Segments [Line Items]      
Revenue € 2,707 € 2,066 € 1,436