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Financial expenses and income (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of detailed information about finance income expense [Line Items] |  |  |  |  |  |
Cost of debt | [1] | € (599) | € (552) | [2] | € (362) | [2]
Interest income | [3] | 413 | 527 | [2] | 239 | [2]
Cost of net debt |  | (186) | (25) | [2] | (123) | [2]
Non-operating foreign exchange gains/(losses) |  | 6 | (2) | [2] | (3) | [2]
Unwinding of discounting of provisions | [4] | (44) | (51) | [2] | (17) | [2]
Net interest cost related to employee benefits |  | (64) | (70) | [2] | (46) | [2]
Gains/(losses) on disposals of financial assets |  | 0 | (1) | [2] | 1 | [2]
Net interest expense on lease liabilities |  | (42) | (37) | [2] | (40) | [2]
Other | [5] | (224) | (523) | [2] | 3 | [2]
Net financial income/(expenses) |  | (554) | (709) | [2] | (225) | [2]
Financial expenses |  | (1,073) | (1,293) | [2],[6],[7] | (430) | [2],[6],[7],[8]
Financial income |  | 519 | 584 | [2],[6],[7] | 205 | [2],[6],[7],[8]
Liability recognised for estimated future royalties |  | (291) | (541) |  |  |
Interest rate and currency derivatives used to hedge debt |  |  |  |  |  |
Disclosure of detailed information about finance income expense [Line Items] |  |  |  |  |  |
Gain on derivatives used to manage debt |  | (45) | (67) |  | (11) |
Gain on derivatives used to manage cash and cash equivalents |  | € (25) | € (13) |  | € 68 |
[1] | (b)Includes net gains/(losses) on interest rate and currency derivatives used to manage debt: €(45) million in 2024, €(67) million in 2023, €(11) million in 2022.
[2] | (a)Figures for comparative periods (2023 and 2022) have been re-presented on a consistent basis to reflect the classification of Opella as a discontinued operation.
[3] | (c)Includes net gains on interest rate and currency derivatives used to manage cash and cash equivalents: €(25) million in 2024, €(13) million in 2023, €68 million in 2022.
[4] | (d)Primarily on provisions for environmental risks, restructuring provisions, and provisions for product-related risks (see Note D.19.).
[5] | (e)Includes a financial expense of €291 million for the remeasurement of the liability recognized in the balance sheet for estimated future royalties on Beyfortus sales in the US. In 2023, that expense amounted to €541 million, reflecting the successful launch of Beyfortus (see Note C.2.).
[6] | (a)Figures for comparative periods (2023 and 2022) have been re-presented on a consistent basis to reflect the classification of Opella as a discontinued operation.
[7] | Figures for comparative periods (2023 and 2022) have been re-presented on a consistent basis to reflect the classification of Opella as a discontinued operation
[8] | 2022 business operating income has been recast from the amount previously reported to include the one-time income of €952 million from the Libtayo transaction (€706 million net of tax)

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