The interest rate on borrowings. [Refer: Borrowings]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2025-01-01
-Paragraph 7
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_7&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_BorrowingsInterestRate
Namespace Prefix:	ifrs-full_
Data Type:	dtr-2022:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount of commercial paper issued by the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2027-01-01
-Name IAS
-Number 1
-IssueDate 2025-01-01
-Paragraph 112
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_112_c&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_CommercialPapersIssued
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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

- Definition

The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

+ References

+ Details

Name:	ifrs-full_NotionalAmount
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Borrowing, Average Drawdown

+ References

No definition available.

+ Details

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

- Definition

Extension, Term

+ References

No definition available.

+ Details

Name:	sny_ExtensionTerm
Namespace Prefix:	sny_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Number Of Bond Redeemed

+ References

No definition available.

+ Details

Name:	sny_NumberOfBondRedeemed
Namespace Prefix:	sny_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number Of One-Year Extension Options

+ References

No definition available.

+ Details

Name:	sny_NumberOfOneYearExtensionOptions
Namespace Prefix:	sny_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number Of Short-Term Debt Program

+ References

No definition available.

+ Details

Name:	sny_NumberOfShortTermDebtProgram
Namespace Prefix:	sny_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number Of Syndicated Credit Facilities

+ References

No definition available.

+ Details

Name:	sny_NumberOfSyndicatedCreditFacilities
Namespace Prefix:	sny_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number Of Tranches

+ References

No definition available.

+ Details

Name:	sny_NumberOfTranches
Namespace Prefix:	sny_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	ifrs-full_BorrowingsByNameAxis=sny_TwoBillionThreeHundredMillionBondsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=sny_FixedRateBondMaturingMarch2029Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=sny_FixedRateBondMaturingMay2033Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=sny_FixedRateBondMaturingMay2037Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=sny_FixedRateBondIssueFromMarch2018Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=sny_FourBillionFacilityMaturingOnMarch2030Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	sny_DebtInstrumentAxis=sny_SanofiEuroMediumTermNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=sny_ThreeBillionEightHundredFiftyMillionFacilityMaturingApril2031Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=sny_FourBillionFacilityMaturingApril2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=sny_CommercialPaperProgramInFranceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=sny_CommercialPaperProgramInUSAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt, cash and cash equivalents - Additional Information (Details) - 6 months ended Jun. 30, 2026 € in Millions, $ in Billions	USD ($) bond extension program credit_facility tranche	EUR (€) extension program credit_facility bond	EUR (€) tranche
Disclosure of detailed information about borrowings [Line Items]
Number of bonds redeemed \| bond	1	1
Number of syndicated credit facilities \| credit_facility	2	2
Number of short-term debt programs \| program	2	2
Two billion three hundred million bonds
Disclosure of detailed information about borrowings [Line Items]
Notional amount			€ 2,300
Number of tranches \| tranche	3		3
Fixed rate bond maturing march 2029
Disclosure of detailed information about borrowings [Line Items]
Notional amount			€ 1,000
Borrowings, interest rate	3.00%		3.00%
Fixed rate bond maturing may 2033
Disclosure of detailed information about borrowings [Line Items]
Notional amount			€ 650
Borrowings, interest rate	3.375%		3.375%
Fixed rate bond maturing May 2037
Disclosure of detailed information about borrowings [Line Items]
Notional amount			€ 650
Borrowings, interest rate	3.75%		3.75%
Fixed rate bond issue from March 2018
Disclosure of detailed information about borrowings [Line Items]
Notional amount			€ 1,500
Four billion facility maturing on March, 2030 \| Sanofi
Disclosure of detailed information about borrowings [Line Items]
Notional amount			4,000
Three billion eight hundred fifty million facility maturing April 2031 \| Sanofi
Disclosure of detailed information about borrowings [Line Items]
Notional amount			3,850
Number of one-year extension options \| extension	2	2
Term of option to extend lease	1 year	1 year
Four billion facility maturing April 2026 \| Sanofi
Disclosure of detailed information about borrowings [Line Items]
Notional amount			4,000
Commercial paper program in France \| Sanofi
Disclosure of detailed information about borrowings [Line Items]
Commercial paper programs			€ 6,000
Borrowing, average drawdown		€ 100
Commercial paper program in USA \| Sanofi
Disclosure of detailed information about borrowings [Line Items]
Commercial paper programs \| $	$ 10.0
Borrowing, average drawdown \| $	$ 3.0