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Income tax - Summary of Deferred Tax Assets Unrecognized (Details) - EUR (€)
€ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Deferred Tax Assets And Liabilities [Line Items]    
Deferred tax assets unrecognized € 535 € 377
Intangible Assets    
Disclosure Of Deferred Tax Assets And Liabilities [Line Items]    
Deferred tax assets unrecognized 72 77
Share-based Compensation    
Disclosure Of Deferred Tax Assets And Liabilities [Line Items]    
Deferred tax assets unrecognized 198 58
Tax Losses Carried Forward    
Disclosure Of Deferred Tax Assets And Liabilities [Line Items]    
Deferred tax assets unrecognized 201 192
Tax Credits Carried Forward    
Disclosure Of Deferred Tax Assets And Liabilities [Line Items]    
Deferred tax assets unrecognized 28 14
Unrealized Losses    
Disclosure Of Deferred Tax Assets And Liabilities [Line Items]    
Deferred tax assets unrecognized 1 3
Other    
Disclosure Of Deferred Tax Assets And Liabilities [Line Items]    
Deferred tax assets unrecognized € 35 € 33