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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) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Reportable segments |  |  |
Disclosure of operating segments [line items] |  |  |
Investments accounted for using the equity method | € 262 | € 285 | € 250
Acquisitions of property, plant and equipment | 1,719 | 1,606 | 1,479
Acquisitions of other intangible assets | 1,305 | 595 | 565
Pharmaceuticals |  |  |
Disclosure of operating segments [line items] |  |  |
Investments accounted for using the equity method |  |  | 159
Acquisitions of property, plant and equipment |  |  | 1,024
Acquisitions of other intangible assets |  |  | 451
Vaccines |  |  |
Disclosure of operating segments [line items] |  |  |
Investments accounted for using the equity method |  |  | 91
Acquisitions of property, plant and equipment |  |  | 382
Acquisitions of other intangible assets |  |  | 108
Biopharma |  |  |
Disclosure of operating segments [line items] |  |  |
Investments accounted for using the equity method | 234 | 248 |
Acquisitions of property, plant and equipment | 1,619 | 1,529 |
Acquisitions of other intangible assets | 1,287 | 574 |
Consumer Healthcare |  |  |
Disclosure of operating segments [line items] |  |  |
Investments accounted for using the equity method | 28 | 37 | 0
Acquisitions of property, plant and equipment | 100 | 77 | 73
Acquisitions of other intangible assets | € 18 | € 21 | € 6

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