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Goodwill and other intangible assets - Schedule of Movements in Other Intangible Assets (Details)
€ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
EUR (€)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
EUR (€)
Dec. 31, 2021
EUR (€)
Disclosure of detailed information about intangible assets [line items]        
Other intangible assets, beginning balance € 21,640   € 21,407  
Amortization expense (2,172)   (2,053) € (1,580)
Other intangible assets, ending balance 24,319   21,640 21,407
Gross value        
Disclosure of detailed information about intangible assets [line items]        
Other intangible assets, beginning balance 81,716   78,865 72,307
Changes in scope of consolidation 3,401   464 3,626
Acquisitions and other increases 3,112   571 616
Disposals and other decreases (683)   (543) (502)
Currency translation differences (1,837)   2,533 2,818
Transfers (396)   (174) 0
Other intangible assets, ending balance 85,313   81,716 78,865
Accumulated amortization & impairment        
Disclosure of detailed information about intangible assets [line items]        
Other intangible assets, beginning balance (60,076)   (57,458) (53,966)
Changes in scope of consolidation 33   11  
Amortization expense (2,345)   (2,196) (1,740)
Impairment losses, net of reversals (932)   454 (192)
Disposals and other decreases 629   525 462
Currency translation differences 1,287   (1,591) (2,022)
Transfers 410   179  
Other intangible assets, ending balance (60,994)   (60,076) (57,458)
Acquired R&D        
Disclosure of detailed information about intangible assets [line items]        
Other intangible assets, beginning balance 6,226   7,730  
Other intangible assets, ending balance 6,038   6,226 7,730
Acquired R&D | Gross value        
Disclosure of detailed information about intangible assets [line items]        
Other intangible assets, beginning balance 10,354   11,207 9,600
Changes in scope of consolidation 113   0 1,805
Acquisitions and other increases 1,062   277 339
Disposals and other decreases (262)   (72) (313)
Currency translation differences (242)   518 560
Transfers (1,253)   (1,576) (784)
Other intangible assets, ending balance 9,772   10,354 11,207
Acquired R&D | Accumulated amortization & impairment        
Disclosure of detailed information about intangible assets [line items]        
Other intangible assets, beginning balance (4,128)   (3,477) (3,508)
Changes in scope of consolidation 0   0  
Amortization expense 0   0 0
Impairment losses, net of reversals (90)   (1,107) (150)
Disposals and other decreases 262   75 313
Currency translation differences 94   (7) (132)
Transfers 128   388  
Other intangible assets, ending balance (3,734)   (4,128) (3,477)
Products, trademarks and other rights        
Disclosure of detailed information about intangible assets [line items]        
Other intangible assets, beginning balance 14,927   13,162  
Other intangible assets, ending balance 17,825   14,927 13,162
Products, trademarks and other rights | Gross value        
Disclosure of detailed information about intangible assets [line items]        
Other intangible assets, beginning balance 69,579   65,906 61,074
Changes in scope of consolidation 3,287   499 1,821
Acquisitions and other increases 1,970   195 159
Disposals and other decreases (380)   (423) (173)
Currency translation differences (1,584)   1,994 2,234
Transfers 861   1,408 791
Other intangible assets, ending balance 73,733   69,579 65,906
Products, trademarks and other rights | Gross value | Antibodies Collaboration agreement | Teva Pharmaceuticals        
Disclosure of detailed information about intangible assets [line items]        
Acquisitions and other increases | $   $ 500    
Products, trademarks and other rights | Gross value | Antibodies Collaboration agreement | Janssen Pharmaceuticals, Inc        
Disclosure of detailed information about intangible assets [line items]        
Acquisitions and other increases | $   $ 175    
Products, trademarks and other rights | Accumulated amortization & impairment        
Disclosure of detailed information about intangible assets [line items]        
Other intangible assets, beginning balance (54,652)   (52,744) (49,345)
Changes in scope of consolidation 33   0  
Amortization expense (2,225)   (2,099) (1,621)
Impairment losses, net of reversals (842)   1,561 (42)
Disposals and other decreases 326   411 133
Currency translation differences 1,184   (1,567) (1,869)
Transfers 268   (214)  
Other intangible assets, ending balance (55,908)   (54,652) (52,744)
Products, trademarks and other rights | Accumulated amortization & impairment | IO License and Collaboration agreement        
Disclosure of detailed information about intangible assets [line items]        
Amortization expense     (226)  
Software        
Disclosure of detailed information about intangible assets [line items]        
Other intangible assets, beginning balance 487   515  
Other intangible assets, ending balance 456   487 515
Software | Gross value        
Disclosure of detailed information about intangible assets [line items]        
Other intangible assets, beginning balance 1,783   1,752 1,633
Changes in scope of consolidation 1   (35) 0
Acquisitions and other increases 80   99 118
Disposals and other decreases (41)   (48) (16)
Currency translation differences (11)   21 24
Transfers (4)   (6) (7)
Other intangible assets, ending balance 1,808   1,783 1,752
Software | Accumulated amortization & impairment        
Disclosure of detailed information about intangible assets [line items]        
Other intangible assets, beginning balance (1,296)   (1,237) (1,113)
Changes in scope of consolidation 0   11  
Amortization expense (120)   (97) (119)
Impairment losses, net of reversals 0   0 0
Disposals and other decreases 41   39 16
Currency translation differences 9   (17) (21)
Transfers 14   5  
Other intangible assets, ending balance € (1,352)   € (1,296) € (1,237)