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Consolidated shareholders’ equity - Summary of Movements Share Capital (Details) - shares
 12 Months Ended
Dec. 14, 2022
Jul. 27, 2022
Jul. 28, 2021
Jul. 28, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of classes of share capital [line items]              
Ending balance (in shares)         1,260,835,732    
Share capital | Sanofi              
Disclosure of classes of share capital [line items]              
Beginning balance (in shares)         1,263,560,695 1,258,971,738 1,253,846,111
Capital increase by exercise of stock subscription options (in shares)         490,373 190,076 868,655
Capital increase by issuance of restricted shares (in shares)         1,499,987 1,836,179 1,666,256
Capital increase reserved for employees (in shares)   2,027,057 2,562,702 2,590,716      
Reduction in share capital by cancellation of treasury shares (in shares) (6,742,380)            
Ending balance (in shares)         1,260,835,732 1,263,560,695 1,258,971,738