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Goodwill and Other Intangible Assets - Schedule of Movements in Other Intangible Assets (Details) - EUR (€)
€ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Disclosure of detailed information about intangible assets [line items]      
Other intangible assets, beginning balance € 21,640    
Amortization expense (1,035) € (910) € (2,053)
Other intangible assets, ending balance 24,590   21,640
Gross value      
Disclosure of detailed information about intangible assets [line items]      
Other intangible assets, beginning balance 81,716    
Changes in scope of consolidation 2,687    
Acquisitions and other increases 1,789    
Disposals and other decreases (140)    
Currency translation differences (1,244)    
Transfers (521)    
Other intangible assets, ending balance 84,287   81,716
Accumulated amortization and impairment      
Disclosure of detailed information about intangible assets [line items]      
Other intangible assets, beginning balance (60,076)    
Amortization expense (1,122)    
Impairment losses, net of reversals (15)    
Disposals and other decreases 115    
Currency translation differences 918    
Transfers 483    
Other intangible assets, ending balance (59,697)   (60,076)
Acquired R&D      
Disclosure of detailed information about intangible assets [line items]      
Other intangible assets, beginning balance 6,226    
Other intangible assets, ending balance 5,231   6,226
Acquired R&D | Gross value      
Disclosure of detailed information about intangible assets [line items]      
Other intangible assets, beginning balance 10,354    
Changes in scope of consolidation 115    
Acquisitions and other increases 115    
Disposals and other decreases (18)    
Currency translation differences (150)    
Transfers (1,122)    
Other intangible assets, ending balance 9,294   10,354
Acquired R&D | Accumulated amortization and impairment      
Disclosure of detailed information about intangible assets [line items]      
Other intangible assets, beginning balance (4,128)    
Amortization expense 0    
Impairment losses, net of reversals (15)    
Disposals and other decreases 18    
Currency translation differences 62    
Transfers 0    
Other intangible assets, ending balance (4,063)   (4,128)
Products, trademarks and other rights      
Disclosure of detailed information about intangible assets [line items]      
Other intangible assets, beginning balance 14,927    
Other intangible assets, ending balance 18,893   14,927
Products, trademarks and other rights | Gross value      
Disclosure of detailed information about intangible assets [line items]      
Other intangible assets, beginning balance 69,579    
Changes in scope of consolidation 2,571    
Acquisitions and other increases 1,642    
Disposals and other decreases (113)    
Currency translation differences (1,087)    
Transfers 601    
Other intangible assets, ending balance 73,193   69,579
Products, trademarks and other rights | Accumulated amortization and impairment      
Disclosure of detailed information about intangible assets [line items]      
Other intangible assets, beginning balance (54,652)    
Amortization expense (1,068)    
Impairment losses, net of reversals 0    
Disposals and other decreases 88    
Currency translation differences 849    
Transfers 483    
Other intangible assets, ending balance (54,300)   (54,652)
Altuviiio      
Disclosure of detailed information about intangible assets [line items]      
Transfers 1,110    
Software      
Disclosure of detailed information about intangible assets [line items]      
Other intangible assets, beginning balance 487    
Other intangible assets, ending balance 466   487
Software | Gross value      
Disclosure of detailed information about intangible assets [line items]      
Other intangible assets, beginning balance 1,783    
Changes in scope of consolidation 1    
Acquisitions and other increases 32    
Disposals and other decreases (9)    
Currency translation differences (7)    
Transfers 0    
Other intangible assets, ending balance 1,800   1,783
Software | Accumulated amortization and impairment      
Disclosure of detailed information about intangible assets [line items]      
Other intangible assets, beginning balance (1,296)    
Amortization expense (54)    
Impairment losses, net of reversals 0    
Disposals and other decreases 9    
Currency translation differences 7    
Transfers 0    
Other intangible assets, ending balance € (1,334)   € (1,296)