XML 112 R100.htm IDEA: XBRL DOCUMENT
v3.26.1

Segment information - Additional Information (Details) - segment | 6 Months Ended |
--- | --- | ---
Jun. 30, 2026 | Apr. 30, 2025
Disclosure of operating segments [Line Items] |  |
Number of operating segments | 1 |
Opella Business |  |
Disclosure of operating segments [Line Items] |  |
Proportion of ownership interest disposed in subsidiary |  | 50.00%

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfOperatingSegmentsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Proportion Of Ownership Interest Disposed In Subsidiary + References No definition available. + Details
Name: | sny_ProportionOfOwnershipInterestDisposedInSubsidiary
Namespace Prefix: | sny_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | sny_DisposalGroupAxis=sny_OpellaBusinessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |