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Operating income - Narrative (Details)	1 Months Ended	12 Months Ended
	Sep. 30, 2024 EUR (€)	Dec. 31, 2024 EUR (€) year	Dec. 31, 2023 EUR (€)	Dec. 31, 2022 EUR (€)
Disclosure of operation income [Line Items]
Revenue from contracts with customers		€ 9,024,000,000	€ 8,339,000,000	€ 7,385,000,000
Revenue	€ 9,147,000,000	€ 9,147,000,000	€ 8,514,000,000	€ 7,551,000,000
Number of main markets of the group | year		5
Percentage of ferrovials group sales in its main five markets over the total sales		88.00%	87.00%	89.00%
Financial income from services provided by the concession operators that apply the financial asset model [Member]
Disclosure of operation income [Line Items]
Revenue		€ 9,000,000	€ 10,000,000	€ 10,000,000

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The income arising in the course of an entity's ordinary activities. Income is increases in assets, or decreases in liabilities, that result in increases in equity, other than those relating to contributions from holders of equity claims.

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