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Debt, cash and cash equivalents and lease liabilities - Additional Information (Details)
€ in Millions, patient in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
bond
Dec. 31, 2022
EUR (€)
credit_facility
currency
shares
Dec. 31, 2022
USD ($)
credit_facility
currency
shares
Apr. 30, 2022
EUR (€)
Country
patient
tranche
Dec. 31, 2021
performance_indicator
credit_facility
Mar. 31, 2019
EUR (€)
Sep. 30, 2016
EUR (€)
Sep. 30, 2014
EUR (€)
Disclosure of detailed information about borrowings [line items]                
Number of bond issues redeemed | bond 3              
Number of credit facilities | credit_facility   2 2          
Number of currencies debt is issued in | currency   2 2          
Sanofi Euro Medium Term Notes (EMTN) bonds | Weighted average interest rate before derivative instruments                
Disclosure of detailed information about borrowings [line items]                
Bonds, interest rate (in percent)   1.60% 1.60%          
Cash and cash equivalents, invested rate   3.90% 3.90%          
Sanofi Euro Medium Term Notes (EMTN) bonds | Weighted average interest rate after derivative instruments                
Disclosure of detailed information about borrowings [line items]                
Bonds, interest rate (in percent)   2.50% 2.50%          
Cash and cash equivalents, invested rate   4.00% 4.00%          
Sanofi sustainability-linked credit facilities                
Disclosure of detailed information about borrowings [line items]                
Number of credit facilities | credit_facility         2      
Number of sustainable development performance indicators | performance_indicator         2      
1983 to 1987 participating shares issued | Sanofi Euro Medium Term Notes (EMTN) bonds                
Disclosure of detailed information about borrowings [line items]                
Number of participating shares outstanding (in shares) | shares   74,996 74,996          
Participating shares carrying amount   € 11            
Syndicated credit facility, expires in 2022                
Disclosure of detailed information about borrowings [line items]                
Credit facilities, amount drawable   4,000            
Syndicated credit facility, expires in 2022 | Sanofi Euro Medium Term Notes (EMTN) bonds                
Disclosure of detailed information about borrowings [line items]                
Credit facilities, amount drawable   4,000            
Syndicated credit facility, expires in December 2025                
Disclosure of detailed information about borrowings [line items]                
Credit facilities, amount drawable   4,000            
Syndicated credit facility, expires in December 2025 | Sanofi Euro Medium Term Notes (EMTN) bonds                
Disclosure of detailed information about borrowings [line items]                
Credit facilities, amount drawable   4,000            
Commercial paper program in France | Sanofi Euro Medium Term Notes (EMTN) bonds                
Disclosure of detailed information about borrowings [line items]                
Commercial paper programs   6,000            
Commercial paper program in USA | Sanofi Euro Medium Term Notes (EMTN) bonds                
Disclosure of detailed information about borrowings [line items]                
Commercial paper programs | $     $ 10,000,000,000          
Borrowing, average drawdown | $ $ 2,300,000,000              
Borrowing, maximum drawdown | $ $ 4,000,000,000              
Borrowing, drawdown | $     $ 0          
Main undrawn confirmed general purpose credit facilities | Sanofi Euro Medium Term Notes (EMTN) bonds                
Disclosure of detailed information about borrowings [line items]                
Credit facilities, amount drawable   € 8,000            
One Billion Five Hundred Million Bonds, Issued In April 2022                
Disclosure of detailed information about borrowings [line items]                
Credit facilities, amount drawable       € 1,500        
Number of tranches | tranche       2        
Eight Hundred And Fifty Million Of Fixed Rate Bonds Maturing April Two Thousand Twenty Five                
Disclosure of detailed information about borrowings [line items]                
Credit facilities, amount drawable       € 850        
Bonds, interest rate (in percent)       0.875%        
Six Hundred And Fifty Million Of Fixed Rate Bonds Maturing April Two Thousand Twenty Nine                
Disclosure of detailed information about borrowings [line items]                
Credit facilities, amount drawable       € 650        
Bonds, interest rate (in percent)       1.25%        
Performance objective, minimum number of patients | patient       1.5        
Number of countries | Country       40        
One Billion Bonds Maturing January 2022                
Disclosure of detailed information about borrowings [line items]                
Credit facilities, amount drawable               € 1,000
Eight Hundred Fifty Million Bonds Maturing February 2022                
Disclosure of detailed information about borrowings [line items]                
Credit facilities, amount drawable           € 850    
Eight Hundred Fifty Million Bonds Maturing June 2022                
Disclosure of detailed information about borrowings [line items]                
Credit facilities, amount drawable             € 850