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Basis of Preparation of the Half-Year Financial Statements and Accounting Policies (Details) - EUR (€)
€ in Millions
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
 [1],[2]
Disclosure of initial application of standards or interpretations [line items]    
Other revenues € 1,452 € 1,529
Argentina    
Disclosure of initial application of standards or interpretations [line items]    
Cumulative consumer price inflation rate 100.00%  
Turkey    
Disclosure of initial application of standards or interpretations [line items]    
Cumulative consumer price inflation rate 100.00%  
[1]
(a)    Figures for the 2024 comparative period have been re-presented on a consistent basis to reflect the classification of Opella as a discontinued operation.
[2] Figures for the 2024 comparative period have been re-presented on a consistent basis to reflect the classification of Opella as a discontinued operation.