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Segment information - Schedule of Acquisition of Intangible Assets, Property, Plant and Equipment and Investments Accounted for Using the Equity Method by Segment (Details) - Biopharma (operating segment) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of operating segments [line items] |  |  |  |
Investments accounted for using the equity method (a) | [1] | € 234 | € 234 | € 248
Acquisitions of property, plant and equipment |  | 1,733 | 1,619 | 1,529
Acquisitions of other intangible assets |  | € 1,462 | € 1,287 | € 574
[1] | (a)Carrying amount at the end of the reporting period.

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