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Consolidated shareholders’ equity - Summary of Movements Share Capital (Details) - shares
 12 Months Ended
Jul. 24, 2024
Jul. 27, 2023
Dec. 14, 2022
Jul. 27, 2022
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of classes of share capital [line items]              
Beginning balance (in shares)         1,263,122,721    
Ending balance (in shares)           1,263,122,721  
Share capital | Sanofi              
Disclosure of classes of share capital [line items]              
Beginning balance (in shares)         1,264,799,969 1,260,835,732 1,263,560,695
Capital increase by exercise of stock subscription options (in shares) [1]         398,569 504,956 490,373
Capital increase by issuance of restricted shares (in shares) [2]         1,479,787 1,330,558 1,499,987
Capital increase reserved for employees (in shares) 2,244,396 2,128,723   2,027,057      
Reduction in share capital by cancellation of treasury shares (in shares)     6,742,380   (5,800,000)    
Ending balance (in shares)         1,263,122,721 1,264,799,969 1,260,835,732
[1] (a)Shares issued on exercise of Sanofi stock subscription options.
[2] (b)Shares vesting under restricted share plans and issued in the period