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Trade and other receivables - Summary of Movements in Group's Allowance for Expected Credit Losses (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Trade And Other Receivables [Line Items]    
Beginning balance € 5  
Ending balance 4 € 5
Trade Receivables    
Disclosure Of Trade And Other Receivables [Line Items]    
Beginning balance 5 8
Provision for expected credit losses 7 12
Reversal of unutilized provisions (5) (12)
Receivables written off (3) (3)
Ending balance € 4 € 5