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Debt, Cash and Cash Equivalents - Additional Information (Details) - 6 months ended Jun. 30, 2025 € in Millions, $ in Millions	EUR (€) € / shares	USD ($)	USD ($) € / shares
Commercial paper program in France | Sanofi Euro Medium Term Notes
Disclosure of detailed information about borrowings [Line Items]
Commercial paper programs	€ 6,000
Borrowing, average drawdown	20
Commercial paper program in USA | Sanofi Euro Medium Term Notes
Disclosure of detailed information about borrowings [Line Items]
Commercial paper programs | $			$ 10,000
Borrowing, average drawdown | $		$ 2,630
Four Billion Facility Maturing December 2027 | Sanofi Euro Medium Term Notes
Disclosure of detailed information about borrowings [Line Items]
Notional amount	4,000
Four Billion Facility Maturing March 2030 | Sanofi Euro Medium Term Notes
Disclosure of detailed information about borrowings [Line Items]
Notional amount	4,000
Fixed Rate Bond Issue from April 2020
Disclosure of detailed information about borrowings [Line Items]
Notional amount	1,000
Fixed Rate Bond Issue from April 2022
Disclosure of detailed information about borrowings [Line Items]
Notional amount	850
One Billion Five Hundred Million Bonds, Issued In March 2025
Disclosure of detailed information about borrowings [Line Items]
Notional amount	€ 1,500
Number Of Tranches | € / shares	2		2
Fixed Rate Bond Maturing March 2027
Disclosure of detailed information about borrowings [Line Items]
Notional amount	€ 850
Fixed Rate Bond Maturing March 2031
Disclosure of detailed information about borrowings [Line Items]
Notional amount	650
Fixed Rate Bond Maturing June 2029
Disclosure of detailed information about borrowings [Line Items]
Notional amount	750
Fixed Rate Bond Maturing March 2032
Disclosure of detailed information about borrowings [Line Items]
Notional amount	750
One Billion Five Hundred Million Bonds, Issued In June 2025
Disclosure of detailed information about borrowings [Line Items]
Notional amount	€ 1,500
Number Of Tranches | € / shares	2		2

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The amount of commercial paper issued by the entity.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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