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Intangible assets - Narrative (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Disclosure of intangible assets other than goodwill [Line Items] |  |
Other intangible assets | € 128 | € 122
Service concession rights [member] | UK waste treatment thalia [Member] |  |
Disclosure of intangible assets other than goodwill [Line Items] |  |
Cash flows due to intangible assets additions excluding infrastructure projects companies | 4 | 3
Computer software [member] |  |
Disclosure of intangible assets other than goodwill [Line Items] |  |
Cash flows due to intangible assets additions excluding infrastructure projects companies | 30 | 28
Other intangible assets [member] | Budimex services business [Member] |  |
Disclosure of intangible assets other than goodwill [Line Items] |  |
Cash flows due to intangible assets additions excluding infrastructure projects companies | 95 | 90
Other intangible assets [member] | Budimex services business [Member] | Construction division [Member] |  |
Disclosure of intangible assets other than goodwill [Line Items] |  |
Cash flows due to intangible assets additions excluding infrastructure projects companies | 22 |
Other intangible assets [member] | Budimex services business [Member] | Power transmission services chile [Member] |  |
Disclosure of intangible assets other than goodwill [Line Items] |  |
Cash flows due to intangible assets additions excluding infrastructure projects companies | 47 | € 44
Other intangible assets [member] | SPV project in Leon County | Construction division [Member] |  |
Disclosure of intangible assets other than goodwill [Line Items] |  |
Cash flows due to intangible assets additions excluding infrastructure projects companies | € 14 |

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- Definition The amount of intangible assets that the entity does not separately disclose in the same statement or note. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2024-01-01 -Paragraph 119 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2024-en-r&anchor=para_119&doctype=Standard -URIDate 2024-03-27 + Details
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