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v3.24.0.1

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

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- Definition Number of operating segments. + References No definition available. + Details
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Namespace Prefix: | sny_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- 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