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Goodwill and other intangible assets - Additional Information (Details) - EUR (€) € in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Feb. 08, 2022 | Sep. 14, 2021 | Sep. 28, 2020 | Jan. 23, 2020
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |  |  |  |  |
Goodwill | € 49,892 | € 48,056 | € 44,364 | [1] |  |  |  |
Intangible assets other than goodwill | 21,640 | 21,407 | 18,341 | [1] |  |  |  |
Gross value |  |  |  |  |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |  |  |  |  |
Acquisitions and other increases | 571 | 616 | 818 |  |  |  |  |
Marketed products |  |  |  |  |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |  |  |  |  |
Intangible assets other than goodwill | € 12,700 | 11,700 | 11,400 |  |  |  |  |
Useful life, intangible assets other than goodwill (in years) | 10 years |  |  |  |  |  |  |
Technological Platforms |  |  |  |  |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |  |  |  |  |
Intangible assets other than goodwill | € 2,200 | € 1,200 | € 200 |  |  |  |  |
Useful life, intangible assets other than goodwill (in years) | 18 years |  |  |  |  |  |  |
Acquisitions and other increases | € 525 |  |  |  |  |  |  |
Other intangible assets excluding software |  |  |  |  |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |  |  |  |  |
Acquisitions and other increases | 472 |  |  |  |  |  |  |
Enjaymo | Gross value |  |  |  |  |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |  |  |  |  |
Acquisitions and other increases | 854 |  |  |  |  |  |  |
Enjaymo | Accumulated impairment |  |  |  |  |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |  |  |  |  |
Acquisitions and other increases | € 363 |  |  |  |  |  |  |
Amunix |  |  |  |  |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |  |  |  |  |
Identifiable intangible assets recognised as of acquisition date |  |  |  |  | € 493 |  |  |
Goodwill |  |  |  |  | € 609 |  |  |
Translate Bio |  |  |  |  |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |  |  |  |  |
Identifiable intangible assets recognised as of acquisition date |  |  |  |  |  | € 396 |  |
Goodwill |  |  |  |  |  | € 2,118 |  |
Principia |  |  |  |  |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |  |  |  |  |
Identifiable intangible assets recognised as of acquisition date |  |  |  |  |  |  | € 2,534 |
Goodwill |  |  |  |  |  |  | € 912 |
Synthorx |  |  |  |  |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |  |  |  |  |
Identifiable intangible assets recognised as of acquisition date |  |  |  |  |  |  |  | € 1,549
Goodwill |  |  |  |  |  |  |  | € 930
[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.

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