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Debt, cash and cash equivalents and lease liabilities - Summary of Bond Issues (Details)
€ in Millions, $ in Millions
Mar. 31, 2020
EUR (€)
Mar. 31, 2019
EUR (€)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
EUR (€)
Sep. 30, 2016
EUR (€)
Apr. 30, 2016
EUR (€)
Sep. 30, 2015
EUR (€)
Sep. 30, 2014
EUR (€)
Nov. 30, 2013
EUR (€)
Sanofi Euro Medium Term Notes (EMTN) bonds | November 2013 EMTN ISIN FR0011625433                  
Disclosure of detailed information about borrowings [line items]                  
Annual interest rate                 2.50%
Amount                 € 1,000
Sanofi Euro Medium Term Notes (EMTN) bonds | April 2022 EMTN ISIN FR0014009KS6                  
Disclosure of detailed information about borrowings [line items]                  
Annual interest rate               0.875%  
Amount               € 850  
Sanofi Euro Medium Term Notes (EMTN) bonds | September 2014 EMTN ISIN FR0012146801                  
Disclosure of detailed information about borrowings [line items]                  
Annual interest rate               1.75%  
Amount               € 1,510  
Sanofi Euro Medium Term Notes (EMTN) bonds | April 2022 EMTN ISIN FR0014009KQ0                  
Disclosure of detailed information about borrowings [line items]                  
Annual interest rate               1.25%  
Amount               € 650  
Sanofi Euro Medium Term Notes (EMTN) bonds | September 2015 EMTN ISIN FR0012969038                  
Disclosure of detailed information about borrowings [line items]                  
Annual interest rate             1.50%    
Amount             € 750    
Sanofi Euro Medium Term Notes (EMTN) bonds | April 2016 EMTN ISIN FR0013143997                  
Disclosure of detailed information about borrowings [line items]                  
Annual interest rate           0.625%      
Amount           € 600      
Sanofi Euro Medium Term Notes (EMTN) bonds | April 2016 EMTN ISIN FR0013144003                  
Disclosure of detailed information about borrowings [line items]                  
Annual interest rate           1.125%      
Amount           € 700      
Sanofi Euro Medium Term Notes (EMTN) bonds | September 2016 EMTN ISIN FR0013201639                  
Disclosure of detailed information about borrowings [line items]                  
Annual interest rate         0.50%        
Amount         € 1,150        
Sanofi Euro Medium Term Notes (EMTN) bonds | March 2020 EMTN ISIN FR0013505104                  
Disclosure of detailed information about borrowings [line items]                  
Annual interest rate 1.00%                
Amount € 1,000                
Sanofi Euro Medium Term Notes (EMTN) bonds | March 2020 EMTN ISIN FR0013505112                  
Disclosure of detailed information about borrowings [line items]                  
Annual interest rate 1.50%                
Amount € 1,000                
Sanofi Euro Medium Term Notes (EMTN) bonds | March 2018 EMTN ISIN FR0013324332                  
Disclosure of detailed information about borrowings [line items]                  
Annual interest rate       0.50%          
Amount       € 1,750          
Sanofi Euro Medium Term Notes (EMTN) bonds | March 2018 EMTN ISIN FR0013324340                  
Disclosure of detailed information about borrowings [line items]                  
Annual interest rate       1.00%          
Amount       € 1,500          
Sanofi Euro Medium Term Notes (EMTN) bonds | March 2018 EMTN ISIN FR0013324357                  
Disclosure of detailed information about borrowings [line items]                  
Annual interest rate       1.375%          
Amount       € 2,000          
Sanofi Euro Medium Term Notes (EMTN) bonds | March 2018 EMTN ISIN FR0013324373                  
Disclosure of detailed information about borrowings [line items]                  
Annual interest rate       1.875%          
Amount       € 1,250          
Sanofi Euro Medium Term Notes (EMTN) bonds | March 2019 EMTN ISIN FR0013409844                  
Disclosure of detailed information about borrowings [line items]                  
Annual interest rate   0.875%              
Amount   € 650              
Sanofi Euro Medium Term Notes (EMTN) bonds | March 2019 EMTN ISIN FR0013409851                  
Disclosure of detailed information about borrowings [line items]                  
Annual interest rate   1.25%              
Amount   € 500              
Shelf registration statement program | June 2018 SNF ISIN US801060AC87                  
Disclosure of detailed information about borrowings [line items]                  
Annual interest rate     3.375%            
Amount | $     $ 1,000            
Shelf registration statement program | June 2018 SNF ISIN US801060AD60                  
Disclosure of detailed information about borrowings [line items]                  
Annual interest rate     3.625%            
Amount | $     $ 1,000