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Related party transactions - Additional Information (Details) - executives	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Related Party [Abstract]
Average number of members of executive committee	10	11	11

X

- Definition

Number of executive committee members.

+ References

No definition available.

+ Details

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

X

- Definition

Related Party [Abstract]

+ References

No definition available.

+ Details

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