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Income tax - Summary of Reconciliation of Net Deferred Tax (Details)
€ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2020
EUR (€)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
EUR (€)
Dec. 31, 2018
EUR (€)
Reconciliation of changes in deferred tax liability (asset) [abstract]        
At January 1 € 7 $ 7 € 6 € 6
Movement recognized in consolidated statement of    operations 144   (11) 136
Movement recognized in consolidated statement of    changes in equity and other comprehensive income (136)   18 (136)
Movement due to acquisition 0   (6) 0
At December 31 € 15 $ 15 € 7 € 6