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Income tax expense - Summary of Difference Between Effective Tax Rate and Standard Corporate Income Tax Rate (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Taxes [Abstract]
Standard tax rate applicable in France	25.80%	28.40%	32.00%
Difference between the standard French tax rate and the rates applicable to the Sanofi	(6.50%)	(9.50%)	(18.20%)
Revisions to tax exposures and settlements of tax disputes	(0.80%)	1.00%	0.50%
Fair value remeasurement of contingent considerations	(0.20%)	0.00%	0.00%
Other items	0.90%	0.10%	(1.20%)
Effective tax rate	19.20%	20.00%	13.10%

X

- Definition

The applicable income tax rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2021-01-01
-Paragraph 81
-Subparagraph c
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_c_ii&doctype=Standard
-URIDate 2021-03-24

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X

- 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 2021-01-01
-Paragraph 81
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X

- 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 2021-01-01
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X

- 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
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- Definition

Income Taxes [Abstract]

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No definition available.

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- Definition

Tax Rate Effect Of Fair Value Remeasurement Of Contingent Considerations

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- Definition

Tax Rate Effect Of Revisions To Tax Exposures And Settlements Of Tax Disputes

+ References

No definition available.

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