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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Pharmaceuticals      
Disclosure of operating segments [line items]      
Investments accounted for using the equity method € 536 € 159 € 154
Acquisitions of property, plant and equipment 1,025 1,024 755
Acquisitions of other intangible assets 463 450 501
Vaccines      
Disclosure of operating segments [line items]      
Investments accounted for using the equity method 104 91 47
Acquisitions of property, plant and equipment 504 382 404
Acquisitions of other intangible assets 111 108 322
Consumer Healthcare      
Disclosure of operating segments [line items]      
Investments accounted for using the equity method 37 0 0
Acquisitions of property, plant and equipment 77 73 95
Acquisitions of other intangible assets 21 6 6
Reportable segments      
Disclosure of operating segments [line items]      
Investments accounted for using the equity method 677 250 201
Acquisitions of property, plant and equipment 1,606 1,479 1,254
Acquisitions of other intangible assets € 595 € 564 € 829