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Events Subsequent to June 30, 2025 (Details) - Vicebio Ltd $ in Millions	Jul. 22, 2025 USD ($)
Disclosure of non-adjusting events after reporting period [line items]
Upfront payment	$ 1,150
Total Milestone Payments	$ 450

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_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Total Milestone Payments

+ References

No definition available.

+ Details

Name:	sny_TotalMilestonePayments
Namespace Prefix:	sny_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Upfront payments.

+ References

No definition available.

+ Details

Name:	sny_UpfrontPayments
Namespace Prefix:	sny_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	sny_AssetsAcquisitionAxis=sny_VicebioLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: