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Other operating income (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure Of Other Operating Income [Line Items] |  |  |  |
Other operating income | € 1,969 | € 859 | € 697 | [1]
Other operating income (expense) |  |  |  |
Disclosure Of Other Operating Income [Line Items] |  |  |  |
Gains on divestment of some mature products | 655 | 418 | 307 |
Regeneron | Other operating income (expense) |  |  |  |
Disclosure Of Other Operating Income [Line Items] |  |  |  |
Other operating income | 1,147 | 195 | 164 |
Other related parties | Other operating income (expense) |  |  |  |
Disclosure Of Other Operating Income [Line Items] |  |  |  |
Other operating income | € 1,178 | 245 | € 199 |
Daiichi Sankyo | Other operating income (expense) |  |  |  |
Disclosure Of Other Operating Income [Line Items] |  |  |  |
Other operating income |  | € 119 |  |
[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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- Definition The amount of miscellaneous other operating income. [Refer: Other operating income (expense)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard -URIDate 2021-03-24 + Details
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