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Consolidated shareholders’ equity - Summary of Currency Translation Differences (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
 [1]
Disclosure of classes of share capital [line items]        
Attributable to equity holders of Sanofi € 74,040 € 74,784 € 68,681  
Attributable to non-controlling interests 313 368 350  
Total equity 74,353 75,152 69,031 [1] € 63,252
Reserve of exchange differences on translation        
Disclosure of classes of share capital [line items]        
Attributable to equity holders of Sanofi (31) 1,499 (865)  
Attributable to non-controlling interests (37) (37) (42)  
Total equity € (68) € 1,462 € (907)  
[1] Includes the impacts of the IFRIC final agenda decisions of March 2021 on the costs of configuring or customising application software used in a Software as a Service (SaaS) arrangement and of April 2021 on the attribution of benefits to periods of service, as described in Note A.2.1. to the consolidated financial statements for the year ended December 31, 2021.