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Property, plant and equipment - Summary of Property, Plant and Equipment Leased (Details) € in Millions | 1 Months Ended | 12 Months Ended
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Dec. 31, 2018 lease | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 EUR (€) | Dec. 31, 2021 EUR (€)
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Right-of-use assets at beginning of period |  | € 1,815 | € 1,948 |
Right-of-use assets at end of period |  | 1,654 | 1,815 | € 1,948
Right-of-use assets |  | 1,654 | 1,815 | 1,948
Lease liabilities |  | € 2,030 | 2,181 | 2,108
Cambridge, Massachusetts |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Number of lease agreements signed | lease | 2 |  |  |
Initial lease term | 15 years | 15 years |  |
Office space, Cambridge, Massachusetts |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Right-of-use assets at beginning of period |  |  | 320 |
Right-of-use assets at end of period |  |  |  | 320
Right-of-use assets |  |  |  | 320
Lease liabilities |  |  |  | 320
Laboratory facilities, Cambridge, Massachusetts |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Right-of-use assets at beginning of period |  |  | 424 |
Right-of-use assets at end of period |  |  |  | 424
Right-of-use assets |  |  |  | 424
Lease liabilities |  |  |  | 424
Gross value |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Right-of-use assets at beginning of period |  | € 2,872 | 2,745 | 1,711
Changes in scope of consolidation |  |  | (26) | 93
Acquisitions and other increases |  | 247 | 292 | 963
Disposals and other decreases |  | (314) | (232) | (91)
Currency translation differences |  | (58) | 101 | 76
Transfers |  | (75) | (8) | (7)
Right-of-use assets at end of period |  | 2,672 | 2,872 | 2,745
Right-of-use assets |  | 2,672 | 2,872 | 2,745
Accumulated depreciation & impairment |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Right-of-use assets at beginning of period |  | (1,057) | (797) | (513)
Changes in scope of consolidation |  |  | 14 |
Depreciation and impairment charged in the period |  | (292) | (341) | (315)
Disposals and other decreases |  | 276 | 82 | 40
Currency translation differences |  | 21 | (17) | (15)
Transfers |  | 34 | 2 | 6
Right-of-use assets at end of period |  | (1,018) | (1,057) | (797)
Right-of-use assets |  | € (1,018) | € (1,057) | € (797)

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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 Increase (Decrease) Through Net Exchange Differences, Property, Plant and Equipment, Right Of Use Assets + References No definition available. + Details
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- Details
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