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Consolidated shareholders' equity - Summary of earnings per share (Details) - EUR (€) € in Millions, shares in Millions | 6 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025
Share Capital, Reserves And Other Equity Interest [Abstract] |  |
Attributable to equity holders of Sanofi | € 1,957.0 | € 5,812.0
Net income from continuing operations | 1,931.0 | 2,941.0
Net income from discontinued operations | € 26.0 | € 2,871.0
Average number of shares outstanding (in shares) | 1,200.4 | 1,225.5
Adjustment for stock options with dilutive effect (in shares) | 0.0 | 0.1
Adjustment for restricted shares (in shares) | 5.1 | 5.1
Average number of shares used to compute diluted earnings per share (in shares) | 1,205.5 | 1,230.7

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- Definition The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2025-01-01 -Paragraph 70 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2025-en-r&anchor=para_70_b&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The potential dilutive effect on the weighted average number of ordinary shares that relate to the assumed exercise of the entity's share options. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 33 -IssueDate 2025-01-01 -Paragraph 70 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2025-en-r&anchor=para_70_b&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The profit (loss) from continuing and discontinued operations attributable to owners of the parent. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 81B -Subparagraph a -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_81B_a_ii&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The profit (loss) from continuing operations attributable to ordinary equity holders of the parent entity. [Refer: Continuing operations, unless line item indicates otherwise [member]; Profit (loss) from continuing operations] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2025-01-01 -Paragraph 70 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2025-en-r&anchor=para_70_a&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2025-01-01 -Paragraph 70 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2025-en-r&anchor=para_70_b&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition Dilutive effect of share options on number of restricted shares. + References No definition available. + Details
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