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Consolidated shareholders’ equity - Summary of Movements Share Capital (Details) - shares
 12 Months Ended
Jul. 27, 2023
Dec. 14, 2022
Jul. 27, 2022
Jul. 28, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of classes of share capital [line items]              
Ending balance (in shares)         1,264,799,969    
Share capital | Sanofi              
Disclosure of classes of share capital [line items]              
Beginning balance (in shares)         1,260,835,732 1,263,560,695 1,258,971,738
Capital increase by exercise of stock subscription options (in shares)         504,956 490,373 190,076
Capital increase by issuance of restricted shares (in shares)         1,330,558 1,499,987 1,836,179
Capital increase reserved for employees (in shares) 2,128,723   2,027,057 2,562,702      
Reduction in share capital by cancellation of treasury shares (in shares)   (6,742,380)          
Ending balance (in shares)         1,264,799,969 1,260,835,732 1,263,560,695