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Non-current asset held for sale and discontinued operations (Details) - EUR (€) € / shares in Units, € in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |
Assets Of Disposal Group Including Discontinued Operations | € 13,489 |  |  |  |
Lease Liabilities, Disposal Group Including Discontinued Operations | 112 |  |  |  |
Non-Current Provisions And Other Non-Current Liabilities, Disposal Group Including Discontinued Operations | 204 |  |  |  |
Accounts Payable, Disposal Group Including Discontinued Operations | 797 |  |  |  |
Current Provisions And Other Current Liabilities, Disposal Group Including Discontinued Operations | 570 |  |  |  |
Other Liabilities, Disposal Group Including Discontinued Operations | 448 |  |  |  |
Liabilities Of Disposal Group Including Discontinued Operations | 2,131 |  |  |  |
Property, Plant And Equipmenet, Disposal Group Including Discontinued Operations | 760 |  |  |  |
Right Of Use Assets, Disposal Group Including Discontinued Operations | 116 |  |  |  |
Goodwill, Disposal Group Including Discontinued Operations | 7,255 |  |  |  |
Other Intangible Assets, Disposal Group Including Discontinued Operations | 2,928 |  |  |  |
Inventories, Disposal Group Including Discontinued Operations | 600 |  |  |  |
Accounts Receivables, Disposal Group Including Discontinued Operations | 989 |  |  |  |
Other Assets, Disposal Group Including Discontinued Operations | 841 |  |  |  |
Net income excluding the exchanged/held-for-exchange Animal Health business | € 64 | € 338 | [1] | € 401 | [1]
Basic earnings (loss) per share from discontinued operations | € 0.04 | € 0.25 | [1] | € 0.31 | [1]
Revenue From Disposal Group Including Discontinued Operations | € 5,031 | € 4,884 |  | € 4,781 |
Income Tax Expense (Benefit), Disposal Group Including Discontinued Operations | (240) | (585) |  | (97) |
Operating Revenue, Disposal Group Including Discontinued Operations | 305 | 915 |  | 494 |
Income Before Tax And Investments Accounted For Using The Equity Method, Disposal Group Including Discontinued Operations | 288 | 902 |  | 485 |
Irrevocable purchase commitments given | 705 |  |  |  |
Irrevocable Purchase Commitments Received | (1) |  |  |  |
Research and development license agreements - contingent milestone payments in connection with development programs in progress | 676 |  |  |  |
Total - net contributions given | 1,380 |  |  |  |
Irrevocable Purchase Commitments, Discontinued Operations | 704 |  |  |  |
Tax expense (income) | 1,204 | 1,017 | [1],[2] | 1,909 | [1],[2]
Deferred tax liability (asset) | (5,801) | € (4,570) |  | € (3,540) |
Opella Business |  |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |
Tax expense (income) | 122 |  |  |  |
Deferred tax liability (asset) | 365 |  |  |  |
Changes in Profit Loss from Discontinued Operations | 274 |  |  |  |
Less than 1 year |  |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |
Irrevocable purchase commitments given | 160 |  |  |  |
Irrevocable Purchase Commitments Received | (1) |  |  |  |
Research and development license agreements - contingent milestone payments in connection with development programs in progress | 6 |  |  |  |
Total - net contributions given | 165 |  |  |  |
Irrevocable Purchase Commitments, Discontinued Operations | 159 |  |  |  |
From 1 to 3 years |  |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |
Irrevocable purchase commitments given | 225 |  |  |  |
Irrevocable Purchase Commitments Received |  |  |  |  |
Research and development license agreements - contingent milestone payments in connection with development programs in progress | 560 |  |  |  |
Total - net contributions given | 785 |  |  |  |
Irrevocable Purchase Commitments, Discontinued Operations | 225 |  |  |  |
From 3 to 5 years |  |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |
Irrevocable purchase commitments given | 204 |  |  |  |
Irrevocable Purchase Commitments Received |  |  |  |  |
Research and development license agreements - contingent milestone payments in connection with development programs in progress | 77 |  |  |  |
Total - net contributions given | 281 |  |  |  |
Irrevocable Purchase Commitments, Discontinued Operations | 204 |  |  |  |
More than 5 years |  |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |
Irrevocable purchase commitments given | 116 |  |  |  |
Irrevocable Purchase Commitments Received |  |  |  |  |
Research and development license agreements - contingent milestone payments in connection with development programs in progress | 33 |  |  |  |
Total - net contributions given | 149 |  |  |  |
Irrevocable Purchase Commitments, Discontinued Operations | € 116 |  |  |  |
[1] | 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
[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.

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