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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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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

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