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Income tax - Summary of Reconciliation of Net Deferred Tax (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Income Tax [Abstract]      
At January 1 € 15 € 7 € 6
Movement recognized in consolidated statement of    operations (240) 144 (11)
Movement recognized in consolidated statement of    changes in equity and other comprehensive income 239 (136) 18
Movement due to acquisition (1) 0 (6)
At December 31 € 13 € 15 € 7