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Property, plant and equipment - Narrative (Details) - EUR (€) € in Millions | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Jan. 01, 2024 | Jan. 01, 2023
Detail information about property plant and equipment [Line Items] |  |  |  |  |
Disposals, property, plant and equipment |  |  | € 63 |  |
Property, plant and equipment | € 772 | € 772 | 594 |  |
Assets classified as held for sale [Member] |  |  |  |  |
Detail information about property plant and equipment [Line Items] |  |  |  |  |
Property, plant and equipment |  | 39 |  |  |
Gross carrying amount [member] |  |  |  |  |
Detail information about property plant and equipment [Line Items] |  |  |  |  |
Additions other than through business combinations, property, plant and equipment | 318 | 318 | 215 |  |
Cash flows due to property plant and equipment additions |  | (282) | (158) |  |
Disposals, property, plant and equipment |  | 77 | 63 |  |
Property, plant and equipment | € 1,377 |  | 1,124 | € 1,124 | € 969
Construction division [Member] |  |  |  |  |
Detail information about property plant and equipment [Line Items] |  |  |  |  |
Disposals, property, plant and equipment |  | (64) |  |  |
Construction division [Member] | Gross carrying amount [member] |  |  |  |  |
Detail information about property plant and equipment [Line Items] |  |  |  |  |
Additions other than through business combinations, property, plant and equipment |  | 117 | 103 |  |
Disposals, property, plant and equipment |  |  | (52) |  |
Property, plant and equipment |  | 144 | 191 |  |
Energy and mobility infrastructures division [Member] | Gross carrying amount [member] |  |  |  |  |
Detail information about property plant and equipment [Line Items] |  |  |  |  |
Additions other than through business combinations, property, plant and equipment |  | € 107 | € 102 |  |

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- Definition The amount of additions to property, plant and equipment other than those acquired through business combinations. [Refer: Total for all business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_e_i&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The decrease in property, plant and equipment resulting from disposals. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 73 -Subparagraph e -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_e_ii&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. Note that right-of-use assets are not included. [Contrast: Property, plant and equipment including right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 73 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_e&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 54 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_a&doctype=Standard -URIDate 2024-03-27 + Details
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