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Trade and other receivables - Summary of Aging of Group's Net Trade Receivables (Details) - EUR (€)
€ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of Trade And Other Receivables [Line Items]    
Trade receivables € 437 € 319
Financial Assets Past Due but Not Impaired    
Disclosure Of Trade And Other Receivables [Line Items]    
Trade receivables 437 319
Financial Assets Past Due but Not Impaired | Current    
Disclosure Of Trade And Other Receivables [Line Items]    
Trade receivables 268 218
Financial Assets Past Due but Not Impaired | Overdue 1 – 30 days    
Disclosure Of Trade And Other Receivables [Line Items]    
Trade receivables 86 62
Financial Assets Past Due but Not Impaired | Overdue 31 – 60 days    
Disclosure Of Trade And Other Receivables [Line Items]    
Trade receivables 43 26
Financial Assets Past Due but Not Impaired | Overdue 60 – 90 days    
Disclosure Of Trade And Other Receivables [Line Items]    
Trade receivables 17 8
Financial Assets Past Due but Not Impaired | Overdue more than 90 days    
Disclosure Of Trade And Other Receivables [Line Items]    
Trade receivables € 23 € 5