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Net deferred tax position - Summary of Net Deferred Tax Position (Details) - EUR (€) € in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net deferred tax asset/(liability) | € 4,570 | € 3,540 | € 2,981
Deferred tax liabilities | 1,857 | 1,841 | 1,617
Reserves likely to be distributed in the foreseeable future | 60,400 |  |
Deferred tax assets | 6,427 | 5,381 | 4,598
Consolidation adjustments (intragroup margin in inventory) |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net deferred tax asset/(liability) | 1,525 | 1,388 | 1,292
Provision for pensions and other employee benefits |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net deferred tax asset/(liability) | 853 | 850 | 1,117
Remeasurement of other acquired intangible assets |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net deferred tax asset/(liability) | (2,904) | (3,269) | (3,079)
Remeasurement of other acquired intangible assets | Bioverativ(c) |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax liabilities | 1,241 |  |
Remeasurement of other acquired intangible assets | Principia |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax liabilities | 610 |  |
Remeasurement of other acquired intangible assets | Genzyme |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax liabilities | 50 |  |
Remeasurement of other acquired intangible assets | Ablynx NV |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax liabilities | 204 |  |
Remeasurement of other acquired intangible assets | Amunix |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax liabilities | 109 |  |
Recognition of acquired property, plant and equipment at fair value |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net deferred tax asset/(liability) | (21) | (24) | (26)
Equity interests in subsidiaries and investments in other entities |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net deferred tax asset/(liability) | (1,023) | (617) | (590)
Tax losses available for carry-forward |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net deferred tax asset/(liability) | 1,526 | 1,506 | 1,516
Stock options and other share-based payments |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net deferred tax asset/(liability) | 84 | 92 | 88
Accrued expenses and provisions deductible at time of payments |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net deferred tax asset/(liability) | 1,994 | 1,859 | 1,585
Other |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net deferred tax asset/(liability) | 2,536 | 1,755 | 1,078
Deferred tax relating to restructuring provisions |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 286 | 256 | € 226
Deferred tax relating to capitalisation of R&D expenses |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | € 1,331 | € 742 |

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