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Segment information - Additional Information (Details) - segment	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Operating Segments [Abstract]
Number of operating segments	2	3

X

- Definition

Number of operating segments.

+ References

No definition available.

+ Details

Name:	sny_NumberOfOperatingSegments1
Namespace Prefix:	sny_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Operating Segments [Abstract]

+ References

No definition available.

+ Details

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