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Goodwill and other intangible assets - Schedule of Movements in Other Intangible Assets (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about intangible assets [line items]      
Other intangible assets, beginning balance € 21,407 € 18,341  
Amortization expense (2,053) (1,580) € (1,681) [1]
Other intangible assets, ending balance 21,640 21,407 18,341
Gross value      
Disclosure of detailed information about intangible assets [line items]      
Other intangible assets, beginning balance 78,865 72,307 71,296
Changes in scope of consolidation 464 3,626 4,083
Acquisitions and other increases 571 616 818
Disposals and other decreases (543) (502) (333)
Currency translation differences 2,533 2,818 (3,557)
Transfers (174) 0 0
Other intangible assets, ending balance 81,716 78,865 72,307
Accumulated amortization & impairment      
Disclosure of detailed information about intangible assets [line items]      
Other intangible assets, beginning balance (57,458) (53,966) (54,787)
Changes in scope of consolidation 11    
Amortization expense (2,196) (1,740) (1,819)
Impairment losses, net of reversals 454 (192) (330)
Disposals and other decreases 525 462 321
Currency translation differences (1,591) (2,022) 2,649
Transfers 179   0
Other intangible assets, ending balance (60,076) (57,458) (53,966)
Acquired R&D      
Disclosure of detailed information about intangible assets [line items]      
Other intangible assets, beginning balance 7,730 6,092  
Other intangible assets, ending balance 6,226 7,730 6,092
Acquired R&D | Gross value      
Disclosure of detailed information about intangible assets [line items]      
Other intangible assets, beginning balance 11,207 9,600 5,730
Changes in scope of consolidation 0 1,805 3,951
Acquisitions and other increases 277 339 654
Disposals and other decreases (72) (313) (44)
Currency translation differences 518 560 (593)
Transfers (1,576) (784) (98)
Other intangible assets, ending balance 10,354 11,207 9,600
Acquired R&D | Accumulated amortization & impairment      
Disclosure of detailed information about intangible assets [line items]      
Other intangible assets, beginning balance (3,477) (3,508) (3,396)
Changes in scope of consolidation 0    
Amortization expense 0 0 0
Impairment losses, net of reversals (1,107) (150) (328)
Disposals and other decreases 75 313 44
Currency translation differences (7) (132) 158
Transfers 388   14
Other intangible assets, ending balance (4,128) (3,477) (3,508)
Products, trademarks and other rights      
Disclosure of detailed information about intangible assets [line items]      
Other intangible assets, beginning balance 13,162 11,729  
Other intangible assets, ending balance 14,927 13,162 11,729
Products, trademarks and other rights | Gross value      
Disclosure of detailed information about intangible assets [line items]      
Other intangible assets, beginning balance 65,906 61,074 63,953
Changes in scope of consolidation 499 1,821 132
Acquisitions and other increases 195 159 58
Disposals and other decreases (423) (173) (243)
Currency translation differences 1,994 2,234 (2,926)
Transfers 1,408 791 100
Other intangible assets, ending balance 69,579 65,906 61,074
Products, trademarks and other rights | Accumulated amortization & impairment      
Disclosure of detailed information about intangible assets [line items]      
Other intangible assets, beginning balance (52,744) (49,345) (50,314)
Changes in scope of consolidation 0    
Amortization expense (2,099) (1,621) (1,707)
Impairment losses, net of reversals 1,561 (42) (2)
Disposals and other decreases 411 133 232
Currency translation differences (1,567) (1,869) 2,460
Transfers (214)   (14)
Other intangible assets, ending balance (54,652) (52,744) (49,345)
Software      
Disclosure of detailed information about intangible assets [line items]      
Other intangible assets, beginning balance 515 520  
Other intangible assets, ending balance 487 515 520
Software | Gross value      
Disclosure of detailed information about intangible assets [line items]      
Other intangible assets, beginning balance 1,752 1,633 1,613
Changes in scope of consolidation (35) 0 0
Acquisitions and other increases 99 118 106
Disposals and other decreases (48) (16) (46)
Currency translation differences 21 24 (38)
Transfers (6) (7) (2)
Other intangible assets, ending balance 1,783 1,752 1,633
Software | Accumulated amortization & impairment      
Disclosure of detailed information about intangible assets [line items]      
Other intangible assets, beginning balance (1,237) (1,113) (1,077)
Changes in scope of consolidation 11    
Amortization expense (97) (119) (112)
Impairment losses, net of reversals 0 0 0
Disposals and other decreases 39 16 45
Currency translation differences (17) (21) 31
Transfers 5   0
Other intangible assets, ending balance (1,296) € (1,237) € (1,113)
IO License And Collaboration Agreement | Accumulated amortization & impairment      
Disclosure of detailed information about intangible assets [line items]      
Amortization expense € (226)    
[1] Includes the impacts of the IFRIC final agenda decisions of March 2021 on the costs of configuring or customising application software used in a Software as a Service (SaaS) arrangement and of April 2021 on the attribution of benefits to periods of service, as described in Note A.2.1. to the consolidated financial statements for the year ended December 31, 2021.