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Taxation - Summary of total unused tax losses carried forward analysed by expiry terms (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
No deferred tax asset recognised € 815 € 937
Deferred tax asset recognised 1,055 1,731
Within 1 year    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
No deferred tax asset recognised
Deferred tax asset recognised 591
More than 1 year but less than 5 years    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
No deferred tax asset recognised 126 120
Deferred tax asset recognised 633 587
More than 5 years but less than 10 years    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
No deferred tax asset recognised 9 9
Deferred tax asset recognised 2 2
More than 10 years but less than 20 years    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
No deferred tax asset recognised
Deferred tax asset recognised
Unlimited    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
No deferred tax asset recognised 681 808
Deferred tax asset recognised € 421 € 550