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Consolidated shareholders’ equity - Summary of Currency Translation Differences (Details) - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of classes of share capital [line items]        
Attributable to equity holders of Sanofi € 77,507 € 74,040 € 74,784  
Attributable to non-controlling interests 350 313 368  
Total equity 77,857 74,353 75,152 € 69,031
Reserve of exchange differences on translation        
Disclosure of classes of share capital [line items]        
Attributable to equity holders of Sanofi 2,408 (31) 1,499  
Attributable to non-controlling interests (17) (37) (37)  
Total equity € 2,391 € (68) € 1,462