XML 255 R209.htm IDEA: XBRL DOCUMENT
v3.24.0.1

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
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