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Income tax - Summary of Deferred Tax Assets Unrecognized (Details) - EUR (€)
€ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of Deferred Tax Assets And Liabilities [Line Items]    
Deferred tax assets unrecognized € 630 € 535
Intangible assets    
Disclosure Of Deferred Tax Assets And Liabilities [Line Items]    
Deferred tax assets unrecognized 74 72
Share-based compensation    
Disclosure Of Deferred Tax Assets And Liabilities [Line Items]    
Deferred tax assets unrecognized 122 198
Tax losses carried forward    
Disclosure Of Deferred Tax Assets And Liabilities [Line Items]    
Deferred tax assets unrecognized 316 201
Tax Credits Carried Forward    
Disclosure Of Deferred Tax Assets And Liabilities [Line Items]    
Deferred tax assets unrecognized 51 28
Unrealized Losses    
Disclosure Of Deferred Tax Assets And Liabilities [Line Items]    
Deferred tax assets unrecognized 7 1
Other    
Disclosure Of Deferred Tax Assets And Liabilities [Line Items]    
Deferred tax assets unrecognized € 60 € 35