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Segment information - Schedule of Reconciliation Between Business Operating Income for the Segments and Income Before Tax and Investments Accounted for Using the Equity Method (Details) € in Millions, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2022 EUR (€) | Nov. 30, 2022 USD ($) | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 EUR (€) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 EUR (€)
Disclosure of operating segments [line items] |  |  |  |  |  |
Share of profit/(loss) from investments accounted for using the equity method |  |  | € (115) | € 68 |  | € 39
Net income attributable to non-controlling interests |  |  | 36 | 113 |  | 56
Fair value remeasurement of contingent consideration |  |  | (93) | 27 |  | (4)
Restructuring costs and similar items |  |  | (1,490) | (1,336) |  | (820)
Other gains and losses, and litigation |  |  | (38) | (370) |  | (5)
Operating income |  |  | 7,875 | 10,656 |  | 8,126
Financial expenses |  |  | (1,313) | (440) |  | (368)
Financial income |  |  | 591 | 206 |  | 40
Income before tax and investments accounted for using the equity method |  |  | 7,153 | 10,422 |  | 7,798
Immuno-oncology collaboration agreement | Regeneron Pharmaceuticals, INC |  |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |  |
Upfront payments for projects under collaboration agreements | $ |  |  |  |  | $ 900 |
Regular milestone payments for projects under collaboration agreements | € 96 | $ 100 |  |  | $ 100 |
Other intangible assets |  |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |  |
Impairment of other intangible assets, net of reversals (excluding software) |  |  | 932 | (454) |  | 192
Other intangible assets | NK Cell and ProXTen technology platforms |  |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |  |
Impairment of other intangible assets, net of reversals (excluding software) |  |  | 833 |  |  |
Other intangible assets | SAR444245 |  |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |  |
Impairment of other intangible assets, net of reversals (excluding software) |  |  |  | 1,586 |  |
ELOCTATE |  |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |  |
Reversal amount |  |  |  | 2,154 |  |
Operating segments |  |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |  |
Business operating income |  |  | 12,670 | 13,040 |  | 10,714
Material reconciling items |  |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |  |
Share of profit/(loss) from investments accounted for using the equity method |  |  | (122) | (88) |  | (39)
Net income attributable to non-controlling interests |  |  | 36 | 33 |  | 56
Amortization and impairment of intangible assets |  |  | (3,068) | (1,599) |  | (1,772)
Fair value remeasurement of contingent consideration |  |  | (93) | 27 |  | (4)
Expenses arising from the impact of acquisitions on inventories |  |  | (20) | (3) |  | (4)
Restructuring costs and similar items |  |  | (1,490) | (1,336) |  | (820)
Other gains and losses, and litigation |  |  | (38) | (370) |  | (5)
Income from out-licensing |  |  | € 0 | € 952 |  | € 0

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