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Net deferred tax position - Summary of Net Deferred Tax Position (Details) - EUR (€) € in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax asset/(liability) | € 3,540 | € 2,981 | € 2,406 |
Deferred tax liabilities | 1,841 | 1,617 | 1,770 | [1]
Reserves likely to be distributed in the foreseeable future | 59,100 |  |  |
Deferred tax assets | 5,381 | 4,598 | 4,176 | [2]
Consolidation adjustments (intragroup margin in inventory) |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax asset/(liability) | 1,388 | 1,292 | 1,142 |
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) | 850 | 1,117 | 1,156 |
Remeasurement of other acquired intangible assets |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax asset/(liability) | (3,269) | (3,079) | (3,083) |
Remeasurement of other acquired intangible assets | Bioverativ |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax liabilities | 1,429 |  |  |
Remeasurement of other acquired intangible assets | Principia |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax liabilities | 625 |  |  |
Remeasurement of other acquired intangible assets | Genzyme |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax liabilities | 150 |  |  |
Remeasurement of other acquired intangible assets | Ablynx N.V. |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax liabilities | 229 |  |  |
Remeasurement of other acquired intangible assets | Amunix |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax liabilities | 118 |  |  |
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) | (24) | (26) | (27) |
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) | (617) | (590) | (522) |
Tax losses available for carry-forward |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax asset/(liability) | 1,506 | 1,516 | 1,327 |
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) | 92 | 88 | 89 |
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) | 1,859 | 1,585 | 1,399 |
Other |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax asset/(liability) | 1,755 | 1,078 | 925 |
Deferred tax relating to restructuring provisions |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax assets | € 256 | € 307 | € 259 |
[1] | Includes the impacts of the IFRIC final agenda decisions of March 2021 on the costs of configuring or customising application software used in a Software as a Service (SaaS) arrangement and of April 2021 on the attribution of benefits to periods of service, as described in Note A.2.1. to the consolidated financial statements for the year ended December 31, 2021.
[2] | Includes the impacts of the IFRIC final agenda decisions of March 2021 on the costs of configuring or customising application software used in a Software as a Service (SaaS) arrangement and of April 2021 on the attribution of benefits to periods of service, as described in Note A.2.1. to the consolidated financial statements for the year ended December 31, 2021.

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