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Property, plant and equipment - Summary of Property, Plant and Equipment Leased (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 property, plant and equipment [line items] |  |  |  |
Right-of-use assets at beginning of period |  | € 1,654 | € 1,815 |
Right-of-use assets at end of period |  | 1,510 | 1,654 | € 1,815
Right-of-use assets |  | 1,510 | 1,654 | 1,815
Lease liabilities |  | € 1,906 | 2,030 | 2,181
Cambridge, Massachusetts |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Initial lease term |  | 15 years |  |
Gross value |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Right-of-use assets at beginning of period |  | € 2,672 | 2,872 | 2,745
Changes in scope of consolidation |  |  |  | (26)
Acquisitions and other increases |  | 442 | 247 | 292
Disposals and other decreases |  | (375) | (314) | (232)
Currency translation differences |  | 89 | (58) | 101
Transfers | [1] | (60) | (75) | (8)
Increase (Decrease) Through Reclassification, Property, Plant and Equipment, Right Of Use Assets | [2] | (155) |  |
Right-of-use assets at end of period |  | 2,613 | 2,672 | 2,872
Right-of-use assets |  | 2,613 | 2,672 | 2,872
Accumulated depreciation & impairment |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Right-of-use assets at beginning of period |  | (1,018) | (1,057) | (797)
Changes in scope of consolidation |  |  |  | 14
Depreciation and impairment charged in the period |  | (315) | (292) | (341)
Disposals and other decreases |  | 183 | 276 | 82
Currency translation differences |  | (30) | 21 | (17)
Transfers | [1] | 38 | 34 | 2
Increase (Decrease) Through Reclassification, Property, Plant and Equipment, Right Of Use Assets | [2] | 39 |  |
Right-of-use assets at end of period |  | (1,103) | (1,018) | (1,057)
Right-of-use assets |  | € (1,103) | € (1,018) | € (1,057)
[1] | (a)This line also includes the effect of the reclassification of assets (other than Opella assets) to Assets held for sale
[2] | (b)This line comprises the Opella right-of-use assets, reclassified to Assets held for sale as of December 31, 2024 in accordance with IFRS 5 (see Note D.1.)

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- Definition The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2023-01-01 -Paragraph 53 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_53_a&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2023-01-01 -Paragraph 47 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_47_b&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term that do not meet the definition of investment property. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2023-01-01 -Paragraph 53 -Subparagraph j -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_53_j&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2023-01-01 -Paragraph 47 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_47_a&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition Acquisition Through Business Combinations, Property, Plant and Equipment, Right Of Use Assets + References No definition available. + Details
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- Definition Additions Other Than Through Business Combinations, Property, Plant and Equipment, Right Of Use Assets + References No definition available. + Details
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- Definition Disposals And Retirements, Property, Plant And Equipment, Right Of Use Assets + References No definition available. + Details
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- Definition Increase (Decrease) Through Net Exchange Differences, Property, Plant and Equipment, Right Of Use Assets + References No definition available. + Details
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- Definition Increase (Decrease) Through Reclassification, Property, Plant and Equipment, Right Of Use Assets + References No definition available. + Details
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- Definition Increase (Decrease) Through Transfers, Property, Plant and Equipment, Right Of Use Assets + References No definition available. + Details
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- Details
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- Details
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