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Related party transactions - Summary of aggregate amounts Payable to Key Management Personnel (Details) - EUR (€) € in Millions	12 Months Ended
	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

X

- 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

X

- 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

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