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Other Operating Income And Expenses - Additional Information (Details) - EUR (€)
€ in Millions
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Disclosure Of Other Operating Income Expenses [Line Items]    
Other operating income € 533 € 563 [1]
Other operating expense 2,476 1,977 [1]
Regeneron | Other operating income (expense)    
Disclosure Of Other Operating Income Expenses [Line Items]    
Other operating income 70 96
Other related parties | Other operating income (expense)    
Disclosure Of Other Operating Income Expenses [Line Items]    
Other operating income 87 121
Gains on divestment of some mature products € 344 € 319
[1] Figures for the 2024 comparative period have been re-presented on a consistent basis to reflect the classification of Opella as a discontinued operation.