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Trade and other receivables - Summary of Aging of Group's Net Trade Receivables (Details) - EUR (€)
€ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Trade And Other Receivables [Line Items]    
Trade receivables € 319 € 297
Financial Assets Past Due but Not Impaired    
Disclosure Of Trade And Other Receivables [Line Items]    
Trade receivables 319 297
Financial Assets Past Due but Not Impaired | Current    
Disclosure Of Trade And Other Receivables [Line Items]    
Trade receivables 218 209
Financial Assets Past Due but Not Impaired | Overdue 1 – 30 Days    
Disclosure Of Trade And Other Receivables [Line Items]    
Trade receivables 62 51
Financial Assets Past Due but Not Impaired | Overdue 31 - 60 Days    
Disclosure Of Trade And Other Receivables [Line Items]    
Trade receivables 26 19
Financial Assets Past Due but Not Impaired | Overdue 60 – 90 Days    
Disclosure Of Trade And Other Receivables [Line Items]    
Trade receivables 8 10
Financial Assets Past Due but Not Impaired | Overdue More than 90 Days    
Disclosure Of Trade And Other Receivables [Line Items]    
Trade receivables € 5 € 8