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Income tax expense - Summary of Difference Between Effective Tax Rate and Standard Corporate Income Tax Rate (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | [1] | Dec. 31, 2022 | [1]
Income Taxes [Abstract] |  |  |  |
Standard tax rate applicable in France |  | 25.80% | 25.80% | 25.80%
Difference between the standard French tax rate and the rates applicable to the Sanofi | [2] | (13.30%) | (15.30%) | (6.90%)
Revisions to tax exposures and settlements of tax disputes |  | 2.80% | 3.10% | (0.80%)
Fair value remeasurement of contingent consideration |  |  | 0.10% | (0.20%)
Other items | [3] | 2.70% | 2.60% | 1.30%
Effective tax rate |  | 18.00% | 16.30% | 19.20%
Other tax effects for reconciliation between accounting profit and tax expense (income) |  | € 58 |  |
[1] | (a)Figures for comparative periods (2023 and 2022) have been re-presented on a consistent basis to reflect the classification of Opella as a discontinued operation.
[2] | (b)The difference between the French tax rate and tax rates applicable to foreign subsidiaries reflects the fact that Sanofi has operations in many countries, most of which have lower tax rates than France. For the year ended December 31, 2024, this line includes a tax expense of €58 million, representing the estimated impact of Pillar Two based on Sanofi’s current understanding of Pillar Two rules.
[3] | In determining the amount of the deferred tax liability for 2024, 2023 and 2022, Sanofi took into account changes in the ownership structure of certain subsidiaries

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- Definition The applicable income tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2023-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_81_c_ii&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The tax expense (income) divided by the accounting profit. [Refer: Accounting profit] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2023-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_81_c_ii&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that the entity does not separately disclose in the same statement or note. [Refer: Accounting profit; Applicable tax rate] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2023-01-01 -Paragraph 81 -Subparagraph c -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_81_c_i&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition Tax rate effects, in aggregate, on the reconciliation between the average effective tax rate and the applicable tax rate that the entity does not separately disclose in the reconciliation. [Refer: Average effective tax rate; Applicable tax rate] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2023-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_81_c_ii&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from the application of foreign tax rates. [Refer: Average effective tax rate; Applicable tax rate] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2023-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_81_c_ii&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition Income Taxes [Abstract] + References No definition available. + Details
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- Definition Tax Rate Effect Of Fair Value Remeasurement Of Contingent Considerations + References No definition available. + Details
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