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Related party transactions - Summary of aggregate amounts Payable to Key Management Personnel (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Related Party [Abstract] |  |  |
Aggregate top-up pension obligation in favor of certain corporate officers and of Executive Committee members | € 9 | € 10 | € 10
Aggregate termination benefits and lump-sum retirement benefits in favor of key management personnel | € 7 | € 6 | € 5

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- Definition Aggregate pension obligation in favor of certain corporate officers and of members of the executive committee. + References No definition available. + Details
Name: | sny_AggregatePensionObligationInFavorOfCertainCorporateOfficersAndOfMembersOfTheExecutiveCommittee
Namespace Prefix: | sny_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Key management personnel compensation, termination benefits and lump sum retirement benefits. + References No definition available. + Details
Name: | sny_KeyManagementPersonnelCompensationTerminationBenefitsAndLumpSumRetirementBenefits
Namespace Prefix: | sny_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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