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Liabilities related to business combinations and to non-controlling interests - Additional Information (Details) - EUR (€) € in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Disclosure Of Liabilities Related To Business Combinations And To Noncontrolling Interests [line items] |  |  |  |  |
Fair value of contingent consideration payable | [1] | € 641 | € 709 | € 779 | € 714
Commitments relating to contingent consideration in connection with business combinations |  | 72 | 133 | 604 |
MSD contingent consideration (European vaccines business) |  |  |  |  |
Disclosure Of Liabilities Related To Business Combinations And To Noncontrolling Interests [line items] |  |  |  |  |
Fair value of contingent consideration payable |  | 72 | 127 | 204 | 269
Shire contingent consideration arising from the acquisition of Translate Bio |  |  |  |  |
Disclosure Of Liabilities Related To Business Combinations And To Noncontrolling Interests [line items] |  |  |  |  |
Fair value of contingent consideration payable |  | € 568 | 441 | 380 | 354
Shire contingent consideration |  |  |  |  |
Disclosure Of Liabilities Related To Business Combinations And To Noncontrolling Interests [line items] |  |  |  |  |
Increase in fair value of liability |  | 13.00% |  |  |
Amunix [Member] |  |  |  |  |
Disclosure Of Liabilities Related To Business Combinations And To Noncontrolling Interests [line items] |  |  |  |  |
Fair value of contingent consideration payable |  | € 0 | € 137 | € 165 | € 0
[1] | (a)Portion due after more than one year: €569 million as of December 31, 2024 (€501 million as of December 31, 2023 and €674 million as of December 31, 2022); portion due within less than one year: €72 million as of December 31, 2024 (€208 million as of December 31, 2023 and €105 million as of December 31, 2022).

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