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Income tax - Schedule of Major Components of Deferred Tax Assets and Liabilities (Details)
€ in Millions, $ in Millions
Dec. 31, 2020
EUR (€)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
EUR (€)
Disclosure Of Deferred Tax Assets And Liabilities [Line Items]            
Deferred tax assets and liabilities € 15 $ 15 € 7 $ 7 € 6 € 6
Intangible Assets            
Disclosure Of Deferred Tax Assets And Liabilities [Line Items]            
Deferred tax assets and liabilities (61)   (42)      
Share-based Compensation            
Disclosure Of Deferred Tax Assets And Liabilities [Line Items]            
Deferred tax assets and liabilities 27   14      
Tax Losses Carried Forward            
Disclosure Of Deferred Tax Assets And Liabilities [Line Items]            
Deferred tax assets and liabilities 224   78      
Property and Equipment            
Disclosure Of Deferred Tax Assets And Liabilities [Line Items]            
Deferred tax assets and liabilities 91   79      
Unrealized Gains            
Disclosure Of Deferred Tax Assets And Liabilities [Line Items]            
Deferred tax assets and liabilities (276)   (126)      
Other            
Disclosure Of Deferred Tax Assets And Liabilities [Line Items]            
Deferred tax assets and liabilities € 10   € 4