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Personnel costs - Additional Information (Details) - employee	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Employee Benefits [Abstract]
Number of employees	84,587	87,994	91,573

X

- Definition

The number of personnel employed by the entity at a date.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 112
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2023-03-23

+ Details

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Balance Type:	na
Period Type:	instant

X

- Definition

Employee Benefits [Abstract]

+ References

No definition available.

+ Details

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Namespace Prefix:	sny_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration