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Trade current assets and liabilities - Narrative (Details) € in Thousands, £ in Millions | Dec. 31, 2024 EUR (€) | Dec. 31, 2024 GBP (£) | Dec. 31, 2023 EUR (€)
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Disclosure of detailed information about working capital [Line Items] |  |  |
Notional amount | € 6,438,000 |  | € 4,990
Long term loans in associates [Member] |  |  |
Disclosure of detailed information about working capital [Line Items] |  |  |
Subordinated loan granted per share holders nominal amount AGS | £ |  | £ 195 |
Ferrovial [Member] |  |  |
Disclosure of detailed information about working capital [Line Items] |  |  |
Notional amount | 1,417,000 |  |
AGS airports holdings limited [Member] | Long term loans in associates [Member] |  |  |
Disclosure of detailed information about working capital [Line Items] |  |  |
Subordinated loan granted per share holders nominal amount AGS | € 235,000 |  |

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