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Related party transactions - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2022 executives
Related Party [Abstract] |
Average number of members of executive committee | 13

X
- Definition Number of executive committee members. + References No definition available. + Details
Name: | sny_NumberOfExecutiveCommitteeMembers
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