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Liabilities related to business combinations and to non-controlling interests - Summary of Movements in Liabilities Related to Business Combinations and to Non-Controlling Interests (Details) - EUR (€) € in Millions | 6 Months Ended |
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Jun. 30, 2026 | Dec. 31, 2025
Changes In Liabilities Related To Business Combinations And Non-Controlling Interests [Roll Forward] |  |
Beginning balance | € 585 |
Payments made | 0 |
Fair value remeasurements through profit or loss: (gain)/loss (including unwinding of discount) | 49 |
Currency translation differences | 18 |
Ending balance | 652 |
Current portion | 0 | € 0
Non-current portion | 652 | € 585
Shire contingent consideration arising from acquisition of Translate Bio |  |
Changes In Liabilities Related To Business Combinations And Non-Controlling Interests [Roll Forward] |  |
Beginning balance | 531 |
Payments made | 0 |
Fair value remeasurements through profit or loss: (gain)/loss (including unwinding of discount) | 38 |
Currency translation differences | 16 |
Ending balance | 585 |
CVRs issued in connection with the acquisition of Blueprint |  |
Changes In Liabilities Related To Business Combinations And Non-Controlling Interests [Roll Forward] |  |
Beginning balance | 48 |
Payments made | 0 |
Fair value remeasurements through profit or loss: (gain)/loss (including unwinding of discount) | 8 |
Currency translation differences | 2 |
Ending balance | 58 |
CVRs issued in connection with the acquisition of Vigil |  |
Changes In Liabilities Related To Business Combinations And Non-Controlling Interests [Roll Forward] |  |
Beginning balance | 5 |
Payments made | 0 |
Fair value remeasurements through profit or loss: (gain)/loss (including unwinding of discount) | 3 |
Currency translation differences | 1 |
Ending balance | 9 |
Other |  |
Changes In Liabilities Related To Business Combinations And Non-Controlling Interests [Roll Forward] |  |
Beginning balance | 1 |
Payments made | 0 |
Fair value remeasurements through profit or loss: (gain)/loss (including unwinding of discount) | 0 |
Currency translation differences | (1) |
Ending balance | € 0 |

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- Definition The amount of contingent liabilities recognised in a business combination. [Refer: Classes of contingent liabilities [domain]; Total for all business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2025-01-01 -Paragraph B67 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2025-en-r&anchor=para_B67_c&doctype=Appendix&subtype=B -URIDate 2025-03-27 + Details
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- Definition The gains (losses) including exchange differences recognised in profit or loss on the fair value measurement of liabilities. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2025-01-01 -Paragraph 93 -Subparagraph e -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2025-en-r&anchor=para_93_e_i&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 95 -Subparagraph d -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_95_d_i&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 95 -Subparagraph d -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_95_d_i&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The amount of contingent liabilities recognised in a business combination that were settled. [Refer: Contingent liabilities recognised in business combination] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2025-01-01 -Paragraph B67 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2025-en-r&anchor=para_B67_c&doctype=Appendix&subtype=B -URIDate 2025-03-27 + Details
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- Definition Changes In Liabilities Related To Business Combinations And Non-Controlling Interests [Roll Forward] + References No definition available. + Details
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- Definition This account includes current portion of contingent considerations that satisfy the recognition criteria of IFRS 3 Business combinations, measured initially at their fair value as at the date of acquisition. This account also includes current portion of liabilities related to non-controlling interests. + References No definition available. + Details
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- Definition This account includes non-current portion of contingent considerations that satisfy the recognition criteria of IFRS 3 Business combinations, measured initially at their fair value as at the date of acquisition. This account also includes non-current portion of liabilities related to non-controlling interests. + References No definition available. + Details
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