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Other operating income (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Other Operating Income [Line Items]      
Other operating income € 1,089 € 979 [1] € 1,814 [1]
Other operating income (expense)      
Disclosure Of Other Operating Income [Line Items]      
Gains on divestment of some mature products 539 484 481
Regeneron | Other operating income (expense)      
Disclosure Of Other Operating Income [Line Items]      
Other operating income 166 227 1,147
Other related parties | Other operating income (expense)      
Disclosure Of Other Operating Income [Line Items]      
Other operating income € 221 € 285 € 1,179
[1] Figures for comparative periods (2023 and 2022) have been re-presented on a consistent basis to reflect the classification of Opella as a discontinued operation