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Employees - Summary of Key Management Compensation (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of Staff And Management Costs [Line Items]      
Salaries and short-term employee benefits € (41) € (29) € (28)
Share-based benefits (15) (10) (5)
Key management compensation excluding non-executive director's fee (56) (39) (33)
Non-Executive Directors’ fees (2) (2) (2)
Key management personnel compensation (58) (41) (35)
Key management personnel of entity or parent      
Disclosure Of Staff And Management Costs [Line Items]      
Expense from share-based payment transactions 12 6 10
Key management personnel of entity or parent | Executive Directors      
Disclosure Of Staff And Management Costs [Line Items]      
Key management personnel compensation (12) (8) (6)
Key management personnel of entity or parent | Other      
Disclosure Of Staff And Management Costs [Line Items]      
Key management personnel compensation € (44) € (31) € (27)