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Goodwill and other intangible assets - Additional Information (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Feb. 08, 2022
Sep. 14, 2021
Sep. 28, 2020
Jan. 23, 2020
Disclosure of reconciliation of changes in goodwill [line items]              
Goodwill € 49,892 € 48,056 € 44,364 [1]        
Intangible assets other than goodwill 21,640 21,407 18,341 [1]        
Gross value              
Disclosure of reconciliation of changes in goodwill [line items]              
Acquisitions and other increases 571 616 818        
Marketed products              
Disclosure of reconciliation of changes in goodwill [line items]              
Intangible assets other than goodwill € 12,700 11,700 11,400        
Useful life, intangible assets other than goodwill (in years) 10 years            
Technological Platforms              
Disclosure of reconciliation of changes in goodwill [line items]              
Intangible assets other than goodwill € 2,200 € 1,200 € 200        
Useful life, intangible assets other than goodwill (in years) 18 years            
Acquisitions and other increases € 525            
Other intangible assets excluding software              
Disclosure of reconciliation of changes in goodwill [line items]              
Acquisitions and other increases 472            
Enjaymo | Gross value              
Disclosure of reconciliation of changes in goodwill [line items]              
Acquisitions and other increases 854            
Enjaymo | Accumulated impairment              
Disclosure of reconciliation of changes in goodwill [line items]              
Acquisitions and other increases € 363            
Amunix              
Disclosure of reconciliation of changes in goodwill [line items]              
Identifiable intangible assets recognised as of acquisition date       € 493      
Goodwill       € 609      
Translate Bio              
Disclosure of reconciliation of changes in goodwill [line items]              
Identifiable intangible assets recognised as of acquisition date         € 396    
Goodwill         € 2,118    
Principia              
Disclosure of reconciliation of changes in goodwill [line items]              
Identifiable intangible assets recognised as of acquisition date           € 2,534  
Goodwill           € 912  
Synthorx              
Disclosure of reconciliation of changes in goodwill [line items]              
Identifiable intangible assets recognised as of acquisition date             € 1,549
Goodwill             € 930
[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.