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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

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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