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Employees - Summary of Key Management Compensation (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Staff And Management Costs [Line Items]      
Salaries and short-term employee benefits € (41) € (41) € (29)
Share-based benefits (13) (15) (10)
Key management compensation excluding non-executive director's fee (54) (56) (39)
Non-Executive Directors’ fees (2) (2) (2)
Key management personnel compensation (56) (58) (41)
Key management personnel of entity or parent      
Disclosure Of Staff And Management Costs [Line Items]      
Expense from share-based payment transactions 8 12 6
Key management personnel of entity or parent | Executive Directors      
Disclosure Of Staff And Management Costs [Line Items]      
Key management personnel compensation (13) (12) (8)
Key management personnel of entity or parent | Other      
Disclosure Of Staff And Management Costs [Line Items]      
Key management personnel compensation € (41) € (44) € (31)