v3.10.0.1
Income Tax - Schedule of Major Components of Deferred Tax Assets and Liabilities (Details) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure Of Deferred Tax Assets And Liabilities [Line Items]        
Deferred tax assets and liabilities € 6 € 6 € 3 € 4
Intangible Assets        
Disclosure Of Deferred Tax Assets And Liabilities [Line Items]        
Deferred tax assets and liabilities (1) (4)    
Share-based Compensation        
Disclosure Of Deferred Tax Assets And Liabilities [Line Items]        
Deferred tax assets and liabilities 6 4    
Tax Losses Carried Forward        
Disclosure Of Deferred Tax Assets And Liabilities [Line Items]        
Deferred tax assets and liabilities 147 3    
Property and Equipment        
Disclosure Of Deferred Tax Assets And Liabilities [Line Items]        
Deferred tax assets and liabilities 5 3    
Unrealized Gains        
Disclosure Of Deferred Tax Assets And Liabilities [Line Items]        
Deferred tax assets and liabilities (154) 0    
Other        
Disclosure Of Deferred Tax Assets And Liabilities [Line Items]        
Deferred tax assets and liabilities € 3 € 0