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Consolidated shareholders’ equity - Summary of Characteristics of Employee Share Ownership Plans Awarded (Details) - € / shares
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Jan. 31, 2024
Feb. 02, 2023
Feb. 03, 2022
Disclosure of classes of share capital [line items]            
Subscription price (as a percent) 80.00% 80.00% 80.00%      
Number of trading days preceding plan approval 20 days 20 days 20 days      
Employees share ownership plan            
Disclosure of classes of share capital [line items]            
Subscription price (in euros per share) [1]       € 72.87 € 79.58 € 80.21
Number of shares subscribed (in shares)       2,124,445 2,009,306 1,909,008
Number of shares issued immediately as employer's contribution (in shares)       119,951 119,417 118,049
[1] (a)Subscription price representing 80% of the average of the opening quoted market prices of Sanofi shares during the 20 trading days preceding May 30, 2024, May 31, 2023 and June 6, 2022, respectively