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Summary of significant accounting policies - Income Tax Expense (Details) - EUR (€) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | [1]
Disclosure Of Detailed Information About Income Taxes [Line Items] |  |  |  |
Deferred tax expense | € (948,000,000) | € (1,234,000,000) | [1] | € (722,000,000)
Temporary differences subject to GILTI |  |  |  |
Disclosure Of Detailed Information About Income Taxes [Line Items] |  |  |  |
Deferred tax expense |  | € 0 |  |
[1] | (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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- Definition The amount of tax expense (income) relating to changes in deferred tax liabilities and deferred tax assets. [Refer: Deferred tax assets; Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2023-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_81_g_ii&doctype=Standard -URIDate 2023-03-23 + Details
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- Details
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