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Taxation - Summary of deferred tax in connection with unused tax losses carried forward (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Changes in deferred tax liability (asset) [abstract]    
Total unused tax losses carried forward € 1,870 € 2,668
Unused tax losses carried forward not recognised as a deferred tax asset 815 937
Unused tax losses carried forward recognised as a deferred tax asset € 1,055 € 1,731
Average tax rate 19.90% 21.10%
Deferred tax asset € 209 € 365