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Segment information - Schedule of Acquisition of Intangible Assets, Property, Plant and Equipment and Investments Accounted for Using the Equity Method by Segment (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reportable segments      
Disclosure of operating segments [line items]      
Investments accounted for using the equity method € 262 € 285 € 250
Acquisitions of property, plant and equipment 1,719 1,606 1,479
Acquisitions of other intangible assets 1,305 595 565
Pharmaceuticals      
Disclosure of operating segments [line items]      
Investments accounted for using the equity method     159
Acquisitions of property, plant and equipment     1,024
Acquisitions of other intangible assets     451
Vaccines      
Disclosure of operating segments [line items]      
Investments accounted for using the equity method     91
Acquisitions of property, plant and equipment     382
Acquisitions of other intangible assets     108
Biopharma      
Disclosure of operating segments [line items]      
Investments accounted for using the equity method 234 248  
Acquisitions of property, plant and equipment 1,619 1,529  
Acquisitions of other intangible assets 1,287 574  
Consumer Healthcare      
Disclosure of operating segments [line items]      
Investments accounted for using the equity method 28 37 0
Acquisitions of property, plant and equipment 100 77 73
Acquisitions of other intangible assets € 18 € 21 € 6