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Impairment of intangible assets and property, plant and equipment - Summary of Net Impairment Losses of Other Intangible Assets (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of impairment loss and reversal of impairment loss [line items]        
Impairment of intangible assets € (454) € 192 € 330 [1]  
Eloctate        
Disclosure of impairment loss and reversal of impairment loss [line items]        
Reversal amount 2,154      
Impairment of intangible assets 1,651      
Eloctate | Other intangible assets        
Disclosure of impairment loss and reversal of impairment loss [line items]        
Impairment of intangible assets       € 2,800
Marketed products | Eloctate        
Disclosure of impairment loss and reversal of impairment loss [line items]        
Reversal amount 1,554      
Research and development projects | Eloctate        
Disclosure of impairment loss and reversal of impairment loss [line items]        
Reversal amount 600      
Other intangible assets        
Disclosure of impairment loss and reversal of impairment loss [line items]        
Impairment of other intangible assets, net of reversals (excluding software) (454) 192 330  
Other intangible assets | Marketed products        
Disclosure of impairment loss and reversal of impairment loss [line items]        
Impairment of other intangible assets, net of reversals (excluding software) (1,561) 42 2  
Other intangible assets | Research and development projects        
Disclosure of impairment loss and reversal of impairment loss [line items]        
Impairment of other intangible assets, net of reversals (excluding software) 1,107 150 328  
Other intangible assets | SAR444245        
Disclosure of impairment loss and reversal of impairment loss [line items]        
Impairment of other intangible assets, net of reversals (excluding software) 1,586      
Pharmaceuticals | Other intangible assets | Marketed products        
Disclosure of impairment loss and reversal of impairment loss [line items]        
Impairment of other intangible assets, net of reversals (excluding software) (1,542) 1 2  
Consumer Healthcare | Other intangible assets | Marketed products        
Disclosure of impairment loss and reversal of impairment loss [line items]        
Impairment of other intangible assets, net of reversals (excluding software) (35) 41 0  
Vaccines | Other intangible assets | Marketed products        
Disclosure of impairment loss and reversal of impairment loss [line items]        
Impairment of other intangible assets, net of reversals (excluding software) € 16 € 0 € 0  
[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.