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Debt, cash and cash equivalents and lease liabilities - Additional Information (Details)
€ in Millions, $ in Millions
 12 Months Ended
Mar. 08, 2023
EUR (€)
extension
Dec. 31, 2023
EUR (€)
program
credit_facility
bond
currency
performance_indicator
shares
Dec. 31, 2023
USD ($)
bond
Dec. 31, 2023
USD ($)
program
credit_facility
currency
performance_indicator
shares
Jun. 30, 2018
USD ($)
Mar. 31, 2018
EUR (€)
Nov. 30, 2013
EUR (€)
Disclosure of detailed information about borrowings [line items]              
Number of bond issues redeemed | bond   3 3        
Number of credit facilities | credit_facility   2   2      
Number of sustainable development performance indicators | performance_indicator   2   2      
Number of commercial paper programs | program   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]              
Annual interest rate   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]              
Annual interest rate   2.10%   2.10%      
Cash and cash equivalents, invested rate   3.70%   3.70%      
€1,750 million bonds maturing March 2023              
Disclosure of detailed information about borrowings [line items]              
Credit facilities, amount drawable           € 1,750  
$1,000 million bonds maturing June 2023              
Disclosure of detailed information about borrowings [line items]              
Credit facilities, amount drawable | $         $ 1,000    
€1,000 million bonds maturing November 2023              
Disclosure of detailed information about borrowings [line items]              
Credit facilities, amount drawable             € 1,000
€4 billion facility maturing March 2029              
Disclosure of detailed information about borrowings [line items]              
Credit facilities, amount drawable € 4,000 € 4,000          
Credit facilities, extension option, number | extension 2            
Credit facilities, extension option, period 1 year 1 year 1 year        
€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          
Syndicated credit facility canceled              
Disclosure of detailed information about borrowings [line items]              
Credit facilities, amount drawable € 4,000            
€4 billion facility maturing December 2027              
Disclosure of detailed information about borrowings [line items]              
Credit facilities, amount drawable   4,000          
€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          
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   58,115   58,115      
Participating shares carrying amount   € 9          
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          
Borrowing, average drawdown   200          
Borrowing, maximum drawdown   800          
Borrowing, drawdown   € 40          
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      
Borrowing, average drawdown | $     $ 3,700        
Borrowing, maximum drawdown | $     $ 7,300        
Borrowing, drawdown | $       $ 1,000