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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, 2021
Dec. 31, 2020
Disclosure Of Trade And Other Receivables [Line Items]    
Beginning balance € 4  
Ending balance 6 € 4
Trade Receivables    
Disclosure Of Trade And Other Receivables [Line Items]    
Beginning balance 4 5
Provision for expected credit losses 7 7
Reversal of unutilized provisions (2) (5)
Receivables written off (3) (3)
Ending balance € 6 € 4