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Property, plant and equipment - Summary of Property, Plant and Equipment Leased (Details)
€ in Millions
 1 Months Ended 12 Months Ended
Dec. 31, 2018
lease
Dec. 31, 2023
EUR (€)
Dec. 31, 2022
EUR (€)
Dec. 31, 2021
EUR (€)
Disclosure of detailed information about property, plant and equipment [line items]        
Right-of-use assets at beginning of period   € 1,815 € 1,948  
Right-of-use assets at end of period   1,654 1,815 € 1,948
Right-of-use assets   1,654 1,815 1,948
Lease liabilities   € 2,030 2,181 2,108
Cambridge, Massachusetts        
Disclosure of detailed information about property, plant and equipment [line items]        
Number of lease agreements signed | lease 2      
Initial lease term 15 years 15 years    
Office space, Cambridge, Massachusetts        
Disclosure of detailed information about property, plant and equipment [line items]        
Right-of-use assets at beginning of period     320  
Right-of-use assets at end of period       320
Right-of-use assets       320
Lease liabilities       320
Laboratory facilities, Cambridge, Massachusetts        
Disclosure of detailed information about property, plant and equipment [line items]        
Right-of-use assets at beginning of period     424  
Right-of-use assets at end of period       424
Right-of-use assets       424
Lease liabilities       424
Gross value        
Disclosure of detailed information about property, plant and equipment [line items]        
Right-of-use assets at beginning of period   € 2,872 2,745 1,711
Changes in scope of consolidation     (26) 93
Acquisitions and other increases   247 292 963
Disposals and other decreases   (314) (232) (91)
Currency translation differences   (58) 101 76
Transfers   (75) (8) (7)
Right-of-use assets at end of period   2,672 2,872 2,745
Right-of-use assets   2,672 2,872 2,745
Accumulated depreciation & impairment        
Disclosure of detailed information about property, plant and equipment [line items]        
Right-of-use assets at beginning of period   (1,057) (797) (513)
Changes in scope of consolidation     14  
Depreciation and impairment charged in the period   (292) (341) (315)
Disposals and other decreases   276 82 40
Currency translation differences   21 (17) (15)
Transfers   34 2 6
Right-of-use assets at end of period   (1,018) (1,057) (797)
Right-of-use assets   € (1,018) € (1,057) € (797)