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Derivative financial instruments and market risks - Disclosure of Financial Currency Hedging Instruments in Place with Notional Amount Translated (Details) € in Millions, $ in Millions | 12 Months Ended |
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Dec. 31, 2024 EUR (€) | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 EUR (€) | Dec. 31, 2024 USD ($)
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |  |
Derivative financial assets | € 217.0 |  |  |  |
Derivative financial liabilities | 458.0 |  |  |  |
Change in fair value of cash flow hedges | (6.0) |  | € (1.0) | € 7.0 |
Forward currency sales in US Dollar |  |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |  |
Notional amount of forward sales | $ |  |  |  |  | $ 3,615
Derivative financial assets | 88.0 |  |  |  |
Forward currency purchases in US dollar, US bond |  |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |  |
Notional amount of forward sales | $ |  |  |  |  | $ 1,000
Derivative financial liabilities | 75.0 |  |  |  |
Change in fair value of cash flow hedges | 0.2 |  |  |  |
Notional amount |  |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |  |
Financial currency hedging instruments in place | 17,261.0 |  | 17,334.0 | 12,556.0 |
Notional amount | Forward currency sales |  |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |  |
Financial currency hedging instruments in place | 10,377.0 |  | 10,279.0 | 7,559.0 |
Notional amount | Forward currency purchases |  |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |  |
Financial currency hedging instruments in place | 6,884.0 |  | 7,055.0 | 4,997.0 |
Notional amount | Less than 1 year | Forward currency sales in US Dollar |  |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |  |
Financial currency hedging instruments in place | 8,923.0 | [1] | 6,628.0 | 6,114.0 |
Notional amount | Less than 1 year | Forward currency sales in Singapore Dollar |  |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |  |
Financial currency hedging instruments in place | 371.0 |  | 157.0 | 111.0 |
Notional amount | Less than 1 year | Forward Currency Sales In Chinese Yuan |  |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |  |
Financial currency hedging instruments in place | 235.0 |  | 513.0 | 203.0 |
Notional amount | Less than 1 year | Forward currency purchases in US Dollar |  |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |  |
Financial currency hedging instruments in place | 4,397.0 | [2] | 3,073.0 | 2,011.0 |
Notional amount | Less than 1 year | Forward currency purchases in Singapore Dollar |  |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |  |
Financial currency hedging instruments in place | 819.0 |  | 2,696.0 | 2,154.0 |
Notional amount | Less than 1 year | Forward currency purchases In Japanese yen |  |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |  |
Financial currency hedging instruments in place | 641.0 |  | 99.0 | 59.0 |
Fair value |  |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |  |
Financial currency hedging instruments in place | (83.0) |  | 53.0 | 90.0 |
Fair value | Forward currency sales |  |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |  |
Financial currency hedging instruments in place | (195.0) |  | 111.0 | 66.0 |
Fair value | Forward currency purchases |  |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |  |
Financial currency hedging instruments in place | 112.0 |  | (58.0) | 24.0 |
Fair value | Less than 1 year | Forward currency sales in US Dollar |  |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |  |
Financial currency hedging instruments in place | (176.0) |  | 101.0 | 59.0 |
Fair value | Less than 1 year | Forward currency sales in Singapore Dollar |  |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |  |
Financial currency hedging instruments in place | 4.0 |  | (1.0) | 0.0 |
Fair value | Less than 1 year | Forward Currency Sales In Chinese Yuan |  |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |  |
Financial currency hedging instruments in place | (1.0) |  | 4.0 | 2.0 |
Fair value | Less than 1 year | Forward currency purchases in US Dollar |  |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |  |
Financial currency hedging instruments in place | 123.0 |  | (52.0) | (4.0) |
Fair value | Less than 1 year | Forward currency purchases in Singapore Dollar |  |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |  |
Financial currency hedging instruments in place | 2.0 |  | (10.0) | 22.0 |
Fair value | Less than 1 year | Forward currency purchases In Japanese yen |  |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |  |
Financial currency hedging instruments in place | € (9.0) |  | € 1.0 | € 1.0 |
[1] | (a)Includes forward sales with a notional amount of $3,615 million expiring in 2025, designated as a hedge of Sanofi’s net investment in Bioverativ. As of December 31, 2024, the fair value of these forward contracts represented a liability of €88 million; the opposite entry was recognized in "Other comprehensive income", with the impact on financial income and expense being immaterial.
[2] | (b)Includes forward purchases with a notional amount of $1,000 million expiring in 2025, designated as a fair value hedge of the exposure of $1,000 million of bond issues to fluctuations in the EUR/USD spot rate. As of December 31, 2024, the fair value of the contracts was an asset of €75 million, the opposite entry for €0.2 million of which was debited to “Other comprehensive income” under the cost of hedging accounting treatment.

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