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Debt, cash and cash equivalents and lease liabilities - Additional Information (Details)
 12 Months Ended
Dec. 31, 2024
EUR (€)
performance_indicator
currency
credit_facility
shares
Dec. 31, 2024
USD ($)
Dec. 31, 2023
EUR (€)
program
credit_facility
bond
Dec. 31, 2024
USD ($)
performance_indicator
currency
credit_facility
shares
Mar. 31, 2023
EUR (€)
Mar. 31, 2018
EUR (€)
Disclosure of detailed information about borrowings [line items]            
Number of bond issues redeemed | bond     1      
Number of credit facilities | credit_facility 2   2 2    
Number of sustainable development performance indicators | performance_indicator 2     2    
Number of commercial paper programs | program     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]            
Annual interest rate 1.70%     1.70%    
Cash and cash equivalents, invested rate 4.20%     4.20%    
Sanofi Euro Medium Term Notes (EMTN) bonds | Weighted average interest rate after derivative instruments            
Disclosure of detailed information about borrowings [line items]            
Annual interest rate 2.10%     2.10%    
Cash and cash equivalents, invested rate 4.10%     4.10%    
€1,750 million bonds maturing March 2023            
Disclosure of detailed information about borrowings [line items]            
Credit facilities, amount drawable           € 600,000,000
€4 billion facility maturing March 2029            
Disclosure of detailed information about borrowings [line items]            
Credit facilities, amount drawable € 4,000,000,000          
€4 billion facility maturing March 2029 | Sanofi Euro Medium Term Notes (EMTN) bonds            
Disclosure of detailed information about borrowings [line items]            
Credit facilities, amount drawable     € 4,000,000,000      
€4 billion facility maturing December 2027            
Disclosure of detailed information about borrowings [line items]            
Credit facilities, amount drawable € 4,000,000,000          
€4 billion facility maturing December 2027 | Sanofi Euro Medium Term Notes (EMTN) bonds            
Disclosure of detailed information about borrowings [line items]            
Credit facilities, amount drawable     € 4,000,000,000      
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 57,844     57,844    
Participating shares carrying amount € 9,000,000          
Commercial paper program in France | Sanofi Euro Medium Term Notes (EMTN) bonds            
Disclosure of detailed information about borrowings [line items]            
Commercial paper programs 6,000,000,000          
Borrowing, average drawdown 0.1          
Borrowing, maximum drawdown € 0.4          
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 | $   $ 5.8        
Borrowing, maximum drawdown | $   $ 8.9        
Borrowing, drawdown | $       $ 1.3    
Syndicated Credit Facility One            
Disclosure of detailed information about borrowings [line items]            
Credit facilities, amount drawable         € 4,000,000,000