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Goodwill and other intangible assets - Schedule of Movements in Other Intangible Assets (Details) € in Millions, $ in Millions | 12 Months Ended
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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)

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