v3.25.3
Derivative Financial Instruments - Disclosure of Financial Currency Hedging Instruments in Place with Notional Amount Translated (Details) - EUR (€)
€ in Millions
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
 [2]
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]    
Change in fair value of cash flow hedges [1] € (23) € (3)
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 3,615  
Derivative financial liabilities 77  
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 1,000  
Derivative financial liabilities 25  
Change in fair value of cash flow hedges 0  
Cross Currency Swap, Expiring 2029    
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]    
Notional amount 870  
Cross Currency Swap, Expiring 2032    
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]    
Notional amount 870  
Cross Currency Swap    
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]    
Derivative financial assets 5  
Change in fair value of cash flow hedges 18  
Notional amount    
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]    
Derivative Financial Instruments To Manage Financial Exposure 12,808  
Notional amount | Cross Currency Seller Swaps    
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]    
Derivative Financial Instruments To Manage Financial Exposure 1,476  
Notional amount | Forward currency sales    
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]    
Derivative Financial Instruments To Manage Financial Exposure 7,723  
Notional amount | Forward currency sales in US dollar | 2025    
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]    
Derivative Financial Instruments To Manage Financial Exposure [3] 6,007  
Notional amount | Forward currency sales in Pound sterling | 2025    
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]    
Derivative Financial Instruments To Manage Financial Exposure 601  
Notional amount | Forward currency sales in Japanese yen | 2025    
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]    
Derivative Financial Instruments To Manage Financial Exposure 303  
Notional amount | Forward currency purchases    
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]    
Derivative Financial Instruments To Manage Financial Exposure 3,609  
Notional amount | Forward currency purchases in Singapore dollar | 2025    
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]    
Derivative Financial Instruments To Manage Financial Exposure 1,289  
Notional amount | Forward currency purchases in US dollar | 2026    
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]    
Derivative Financial Instruments To Manage Financial Exposure [4] 1,094  
Notional amount | Forward Currency Purchases In Hungarian florint | 2025    
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]    
Derivative Financial Instruments To Manage Financial Exposure 639  
Notional amount | Cross Currency Seller Swaps In US Dollar | 2032    
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]    
Derivative Financial Instruments To Manage Financial Exposure [5] 1,476  
Fair value    
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]    
Derivative Financial Instruments To Manage Financial Exposure 137  
Fair value | Cross Currency Seller Swaps    
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]    
Derivative Financial Instruments To Manage Financial Exposure 5  
Fair value | Forward currency sales    
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]    
Derivative Financial Instruments To Manage Financial Exposure 176  
Fair value | Forward currency sales in US dollar | 2025    
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]    
Derivative Financial Instruments To Manage Financial Exposure 148  
Fair value | Forward currency sales in Pound sterling | 2025    
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]    
Derivative Financial Instruments To Manage Financial Exposure 7  
Fair value | Forward currency sales in Japanese yen | 2025    
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]    
Derivative Financial Instruments To Manage Financial Exposure 9  
Fair value | Forward currency purchases    
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]    
Derivative Financial Instruments To Manage Financial Exposure (44)  
Fair value | Forward currency purchases in Singapore dollar | 2025    
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]    
Derivative Financial Instruments To Manage Financial Exposure (14)  
Fair value | Forward currency purchases in US dollar | 2026    
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]    
Derivative Financial Instruments To Manage Financial Exposure (33)  
Fair value | Forward Currency Purchases In Hungarian florint | 2025    
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]    
Derivative Financial Instruments To Manage Financial Exposure 7  
Fair value | Cross Currency Seller Swaps In US Dollar | 2032    
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items]    
Derivative Financial Instruments To Manage Financial Exposure € 5  
[1] These unaudited condensed half year consolidated financial statements as of June 30, 2025 should be read in conjunction with Sanofi’s audited consolidated financial statements as of December 31, 2024.
[2] Figures for the 2024 comparative period have been re-presented on a consistent basis to reflect the classification of Opella as a discontinued operation.
[3] 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 June 30, 2025, the fair value of these forward contracts represented an asset of €77 million; the opposite entry was recognized in Other comprehensive income, with the impact on financial income and expense being immaterial.
[4] 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 June 30, 2025, the fair value of these contracts represented a liability of €25 million, with €0 million credited to Other comprehensive income to recognize the hedging cost.
[5] Comprises two cross currency swaps, (i) with a notional amount of $870 million, pay 4.16% receive EUR 2.50%, expiring 2029 and (ii) with a notional amount of $870 million, pay 4.53% receive EUR 3.00%, expiring 2032, designated as a fair value hedge of the exposure of an equivalent amount of cash & cash equivalents to fluctuations in the EUR/USD spot rate. As of June 30, 2025, the fair value of the swaps was an asset of €5 million, with €18 million debited to Other comprehensive income under the cost of hedging accounting treatment.