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Derivative Financial Instruments - Disclosure of Financial Currency Hedging Instruments in Place with Notional Amount Translated (Details)
€ in Millions, $ in Millions
 6 Months Ended
Jun. 30, 2025
EUR (€)
Jun. 30, 2024
EUR (€)
 [1]
Jun. 30, 2025
USD ($)
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 € (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]      
Financial currency hedging instruments in place 12,808    
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 7,723    
Notional amount | Forward currency sales in US dollar | 2026      
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] 6,007    
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 3,609    
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]      
Financial currency hedging instruments in place 1,289    
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]      
Financial currency hedging instruments in place [3] 1,094    
Notional amount | Forward currency sales in Chinese yuan renminbi | 2025      
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 601    
Notional amount | Forward Currency Sales In Canadian Dollar | 2025      
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 303    
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]      
Financial currency hedging instruments in place 639    
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]      
Financial currency hedging instruments in place 1,476    
Notional amount | Cross Currency Seller Swaps In US Dollar | 2026      
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] 1,476    
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 137    
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 176    
Fair value | Forward currency sales in US dollar | 2026      
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 148    
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 (44)    
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]      
Financial currency hedging instruments in place (14)    
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]      
Financial currency hedging instruments in place (33)    
Fair value | Forward currency sales in Chinese yuan renminbi | 2025      
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 7    
Fair value | Forward Currency Sales In Canadian Dollar | 2025      
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    
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]      
Financial currency hedging instruments in place 7    
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]      
Financial currency hedging instruments in place 5    
Fair value | Cross Currency Seller Swaps In US Dollar | 2026      
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 € 5    
[1] Figures for the 2024 comparative period have been re-presented on a consistent basis to reflect the classification of Opella as a discontinued operation.
[2] 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.
[3] (c)    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
[4] 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.