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v3.22.4

Related party transactions - Additional Information (Details) - executives | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Related Party [Abstract] |  |  |
Average number of members of executive committee | 11 | 11 | 11

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- 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

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- 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