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Debt, Cash and Cash Equivalents - Additional Information (Details) - 6 months ended Jun. 30, 2025
$ in Millions
EUR (€)
USD ($)
USD ($)
Commercial paper program in France | Sanofi Euro Medium Term Notes      
Disclosure of detailed information about borrowings [Line Items]      
Commercial paper programs € 6,000,000,000    
Borrowing, average drawdown 20,000,000.00    
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 4,000,000,000    
Four Billion Facility Maturing March 2030 | Sanofi Euro Medium Term Notes      
Disclosure of detailed information about borrowings [Line Items]      
Notional amount 4,000,000,000    
Fixed Rate Bond Issue from April 2020      
Disclosure of detailed information about borrowings [Line Items]      
Notional amount 1,000,000,000    
Fixed Rate Bond Issue from April 2022      
Disclosure of detailed information about borrowings [Line Items]      
Notional amount 850,000,000    
One Billion Five Hundred Million Bonds, Issued In March 2025      
Disclosure of detailed information about borrowings [Line Items]      
Notional amount € 1,500,000,000    
Number Of Tranches 2    
Fixed Rate Bond Maturing March 2027      
Disclosure of detailed information about borrowings [Line Items]      
Notional amount € 850,000,000    
Fixed Rate Bond Maturing March 2031      
Disclosure of detailed information about borrowings [Line Items]      
Notional amount 650,000,000    
Fixed Rate Bond Maturing June 2029      
Disclosure of detailed information about borrowings [Line Items]      
Notional amount 750,000,000    
Fixed Rate Bond Maturing March 2032      
Disclosure of detailed information about borrowings [Line Items]      
Notional amount 750,000,000    
One Billion Five Hundred Million Bonds, Issued In June 2025      
Disclosure of detailed information about borrowings [Line Items]      
Notional amount € 1,500,000,000    
Number Of Tranches 2