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Property, plant and equipment - Summary of Acquisitions and Capitalized Interest by Operating Segment (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of acquisitions of property plant and equipment by operating segments [line items]      
Acquisitions € 1,748 € 1,504 € 1,310
Capitalized interest 17 14 11
Pharmaceuticals      
Disclosure of acquisitions of property plant and equipment by operating segments [line items]      
Acquisitions 1,049 1,007 831
Pharmaceuticals | Industrial facilities      
Disclosure of acquisitions of property plant and equipment by operating segments [line items]      
Acquisitions 597 534 634
Pharmaceuticals | Research sites      
Disclosure of acquisitions of property plant and equipment by operating segments [line items]      
Acquisitions 153 277 152
Pharmaceuticals | Other      
Disclosure of acquisitions of property plant and equipment by operating segments [line items]      
Acquisitions 299 199 45
Vaccines      
Disclosure of acquisitions of property plant and equipment by operating segments [line items]      
Acquisitions 629 421 384
Consumer Healthcare      
Disclosure of acquisitions of property plant and equipment by operating segments [line items]      
Acquisitions € 70 € 73 € 95