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Taxation - Breakdown of certain net deferred tax asset positions by jurisdiction (Details) - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Certain deferred tax assets € 66 € 308
Poland    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Certain deferred tax assets 244
Slovakia    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Certain deferred tax assets 1
China    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Certain deferred tax assets 9 2
Australia    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Certain deferred tax assets 1 1
Hong Kong    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Certain deferred tax assets 5 8
USA    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Certain deferred tax assets 1
Türkiye    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Certain deferred tax assets 40 41
Taiwan    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Certain deferred tax assets € 10 € 11