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Other operating income and expenses - Schedule of Other Operating Expenses (Details) - EUR (€) € in Millions | 6 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025
Disclosure Of Other Operating Income Expenses [Line Items] |  |
Net gains / (losses) on disposals of operating assets or businesses | € 241 | € 344
Other | 800 | 533
Total other operating income | 800 | 533
Miscellaneous other operating expense | (3,436) | (2,476)
Total other operating expenses | (3,436) | (2,476)
Amvuttra |  |
Disclosure Of Other Operating Income Expenses [Line Items] |  |
Amvuttra licensing income | 398 | 120
Regeneron | Share of profit or loss from commercialization of monoclonal antibodies |  |
Disclosure Of Other Operating Income Expenses [Line Items] |  |
Miscellaneous other operating expense | (3,486) | (2,475)
Regeneron | Additional profit share for development cost |  |
Disclosure Of Other Operating Income Expenses [Line Items] |  |
Other | 594 | 494
Regeneron | Commercialization related expenses |  |
Disclosure Of Other Operating Income Expenses [Line Items] |  |
Miscellaneous other operating expense | (336) | (346)
Other related parties |  |
Disclosure Of Other Operating Income Expenses [Line Items] |  |
Other | 161 | 69
Miscellaneous other operating expense | € (208) | € (149)

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