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Investment in associates - Narrative (Details) € / shares in Units, £ in Millions, $ in Millions, $ in Millions | 9 Months Ended | 12 Months Ended |  |  |  |
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Sep. 30, 2024 CAD ($) | Dec. 31, 2025 GBP (£) | Dec. 31, 2024 EUR (€) € / shares | Dec. 31, 2024 USD ($) | Dec. 31, 2024 CAD ($) | Dec. 31, 2023 EUR (€) year € / shares | Dec. 31, 2023 USD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2022 EUR (€) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 CAD ($) | Dec. 31, 2025 EUR (€) | Dec. 31, 2024 GBP (£) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) year | Dec. 31, 2023 CAD ($) year | Dec. 31, 2021 EUR (€)
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in equity |  |  | € 2,309,000,000 |  |  | € (467,000,000) |  |  |  |  |  |  |  |  |  |  |
Profit (loss) |  |  | 3,490,000,000 |  |  | 511,000,000 |  |  | € 305,000,000 |  |  |  |  |  |  |  |
Ownership interest of the Ferrovial |  |  | 2,023,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital gain before taxes |  |  | 0.95 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives investment in associates |  |  | € 20,000,000 |  |  | 17,000,000 |  |  |  |  |  |  |  |  |  |  |
Positive impacts |  |  |  |  |  | 43,000,000 |  |  |  |  |  |  |  |  |  |  |
Parcentage of debt commitments in AGS |  |  | 50.00% | 50.00% | 50.00% |  |  |  |  |  |  |  |  |  |  |  |
Recognition of a capital gain |  |  | € 19,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage holding the majority of voting rights |  |  | 49.00% | 49.00% | 49.00% |  |  |  |  |  |  |  |  |  |  |  |
Percentage of economic rights and majority of voting rights |  |  | 100.00% |  |  |  |  |  |  |  |  |  | 100.00% | 100.00% |  |  |
Increase decrease in investments in associates |  |  | € 985,000,000 |  |  | 87,000,000 |  |  |  |  |  |  |  |  |  |  |
Increase decrease in investments in associates other |  |  | (168,000,000) |  |  | (5,000,000) |  |  |  |  |  |  |  |  |  |  |
Long term loans in associates [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subordinated loan granted per share holders nominal amount AGS | £ |  |  |  |  |  |  |  |  |  |  |  |  | £ 195 |  |  |  |
Toll roads division [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Profit (loss) |  |  | 663,000,000 |  |  | € 548,000,000 |  |  | € 157,000,000 |  |  |  |  |  |  |  |
Capital gain transaction price |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recognition of a capital gain |  |  | € 19,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage holding the majority of voting rights |  |  | 51.00% | 51.00% | 51.00% |  |  |  |  |  |  |  |  |  |  |  |
India, Rupees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Par value per share | € / shares |  |  | € 57.24 |  |  | € 41.55 |  |  |  |  |  |  |  |  |  |  |
India, Rupees | Exchange rate interval maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange rate |  |  | 90.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
407 International Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate |  |  | 43.23% | 43.23% | 43.23% |  |  |  |  |  |  |  |  |  |  |  |
Percentage of divestment of ownership interest |  |  | 10.00% |  |  |  |  |  |  |  |  |  | 10.00% | 10.00% |  |  |
Derivatives investment in associates |  |  | € 0 |  |  | € 0 |  |  |  |  |  |  |  |  |  |  |
Increase decrease in investments in associates other |  |  | € 0 |  |  | € 0 |  |  |  |  |  |  |  |  |  |  |
407 International Inc [Member] | Toll roads division [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate |  |  | 43.23% | 43.23% | 43.23% |  |  |  |  |  |  |  |  |  |  |  |
407 International Inc [Member] | Canada, Dollars |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in equity | $ |  |  |  |  | $ (409) |  |  |  |  |  |  |  |  |  |  |  |
Dividends payments to shareholders | $ |  |  |  |  | 1,100 |  |  |  |  |  |  |  |  |  |  |  |
Profit (loss) | $ | $ (692) |  |  |  |  |  |  | $ (567) |  |  | $ (435) |  |  |  |  |  |
Non-current portion of non-current borrowings | $ | $ 10,716 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,318 |
Increase decrease in non current liabilities | $ |  |  |  |  | $ 401 |  |  |  |  |  |  |  |  |  |  |  |
407 International Inc [Member] | Canada, Dollars | Toll roads division [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase decrease in borrowings | $ |  |  |  |  |  |  |  |  |  |  | $ 509 |  |  |  |  |  |
JFKNTO sponsor aggregator LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate |  |  | 49.00% | 49.00% | 49.00% |  |  |  |  |  |  |  |  |  |  |  |
Percentage of divest carlyle groupIn JFKNTO LLC |  |  |  |  |  | 4.00% |  |  |  |  |  |  |  |  | 4.00% | 4.00% |
The percentage transaction achieved a total real interest cost |  |  | 4.65% | 4.65% | 4.65% |  |  |  |  |  |  |  |  |  |  |  |
Derivatives investment in associates |  |  | € 9,000,000 | $ 20.0 |  | € 31,000,000 |  |  |  |  |  |  |  |  |  |  |
Increase decrease in investments in associates other |  |  | € 0 |  |  | (1,000,000) |  |  |  |  |  |  |  |  |  |  |
JFKNTO sponsor aggregator LLC [Member] | Toll roads division [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate |  |  | 49.00% | 49.00% | 49.00% |  |  |  |  |  |  |  |  |  |  |  |
JFKNTO sponsor aggregator LLC [Member] | United States of America, Dollars |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total amount of commitment to inject social capital by shareholders | $ |  |  |  | $ 2,330.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of commitment to inject social capital by ferrovial | $ |  |  |  |  |  |  |  |  |  | $ 1,142.0 |  |  |  |  |  |  |
Issued capital | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,635.0 | $ 600.0 |  |
Amount disbursed of commitment to inject social capital by Ferrovial | $ |  |  |  | 801.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps IRS associated with the projects bank debt and future debt issuances effective hedge accounting | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | 645.0 | 3,005.0 |  |
Amount insured by assured guaranty municipal corp of bonds issued by NTO | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | 800.0 | 800.0 |  |
JFKNTO sponsor aggregator LLC [Member] | United States of America, Dollars | Concession [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expenses necessary to obtain the concession contract, as well as the costs of construction and development of the project. | $ |  |  |  | 3,971.0 |  |  | $ 2,247.0 |  |  |  |  |  |  |  |  |  |
JFKNTO sponsor aggregator LLC [Member] | United States of America, Dollars | Concession present value of future payments to the port authority |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related to the present value of the future payments, throughout the concession period, for the acquisition of the concession | $ |  |  |  | 4,096.0 |  |  | 3,921.0 |  |  |  |  |  |  |  |  |  |
JFKNTO sponsor aggregator LLC [Member] | United States of America, Dollars | Amortization expense and a bond issue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The project issued Green Bonds | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,550.0 |  |  |
Increase decrease in non current liabilities | $ |  |  |  |  |  |  | $ 2,000.0 |  |  |  |  |  |  |  |  |  |
JFKNTO sponsor aggregator LLC [Member] | United States of America, Dollars | Net variation in bank borrowings [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-current portion of non-current borrowings | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,600.0 | $ 1,740.0 |  |
JFKNTO sponsor aggregator LLC [Member] | United States of America, Dollars | Other movements [Member] | Capital contributions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in equity | $ |  |  |  | $ 1,035.0 |  |  |  |  |  |  |  |  |  |  |  |  |
AGS airports holdings limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate |  |  | 50.00% | 50.00% | 50.00% |  |  |  |  |  |  |  |  |  |  |  |
Derivatives investment in associates |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale or issue of treasury shares | £ |  | £ 900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase decrease in investments in associates other |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
AGS airports holdings limited [Member] | AGS Divestment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of sale of all participation |  |  |  |  |  |  |  |  |  |  |  | € 1 |  |  |  |  |
Proceeds from sale or issue of treasury shares | £ |  | 900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital gain transaction price |  |  |  |  |  |  |  |  |  |  |  | € 297,000,000 |  |  |  |  |
AGS airports holdings limited [Member] | Long term loans in associates [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subordinated loan granted per share holders nominal amount AGS |  |  | € 235,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
AGS airports holdings limited [Member] | Macquari [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of sale of all participation |  |  | € 0.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |
IRB infrastructure developers limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate |  |  | 19.86% | 19.86% | 19.86% |  |  |  |  |  |  |  |  |  |  |  |
Total stake retain by Ferrovial for associates |  |  | 5.00% | 5.00% | 5.00% |  |  |  |  |  |  |  |  |  |  |  |
Capital gain before taxes |  |  | € 133,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  | € 215,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount paid for the adquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 369,000,000
Percentage of the adquisition |  |  | 5.00% |  |  |  |  |  |  |  |  |  | 5.00% | 5.00% |  |  | 24.86%
Derivatives investment in associates |  |  | € (4,000,000) |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |
Increase decrease in investments in associates other |  |  | (80,000,000) |  |  | (1,000,000) |  |  |  |  |  |  |  |  |  |  |
IRB infrastructure developers limited [Member] | October [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Price divestment in different concessions |  |  | € (77,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
IRB infrastructure developers limited [Member] | Toll roads division [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage adquired by Ferrovial subsidiary of the buyers capital |  |  | 23.99% |  |  |  |  |  |  |  |  |  | 23.99% | 23.99% |  |  |
IRB infrastructure developers limited [Member] | India, Rupees | Exchange rate interval minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange rate |  |  | 89.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other companies [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent liabilities relating to associates that might ultimately be assumed by the group |  |  |  |  |  | € 0 |  |  |  |  |  |  |  |  |  |  |
Number of significant companies in which the ownership interest exceeds 20% that are not equity accounted | year |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  | 0 | 0 |
Derivatives investment in associates |  |  | € 15,000,000 |  |  | € (15,000,000) |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest exceed that are not equity accounted |  |  | 20.00% |  |  |  |  |  |  |  |  |  | 20.00% | 20.00% |  |  |
Increase decrease in investments in associates other |  |  | € (88,000,000) |  |  | (3,000,000) |  |  |  |  |  |  |  |  |  |  |
IRB Infrastructure Trust (Private InvIT) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate |  |  | 23.99% | 23.99% | 23.99% |  |  |  |  |  |  |  |  |  |  |  |
Total investment related to the acquisition |  |  | € 652,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retains its current stak |  |  | € 0.51 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total stake retain by Ferrovial for associates |  |  | 34.10% | 34.10% | 34.10% |  |  |  |  |  |  |  |  |  |  |  |
Derivatives investment in associates |  |  | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest exceed that are not equity accounted |  |  | 19.86% |  |  |  |  |  |  |  |  |  | 19.86% | 19.86% |  |  |
Increase decrease in investments in associates other |  |  | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
IRB Infrastructure Trust (Private InvIT) [Member] | Toll roads division [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Ferrovials share capital related to the number of shares acquired share based remuneration schemes |  |  | 23.99% |  |  |  |  |  |  |  |  |  | 23.99% | 23.99% |  |  |
Total investment related to the acquisition |  |  | € 652,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest exceed that are not equity accounted |  |  | 19.86% |  |  |  |  |  |  |  |  |  | 19.86% | 19.86% |  |  |
Toll road concessions |  |  | € 14 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount acquisition |  |  | € 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 19.86% | 19.86% | 19.86% |  |  |  |  |  |  |  |  |  |  |  |
Percentage held in shares |  |  | 23.99% |  |  |  |  |  |  |  |  |  | 23.99% | 23.99% |  |  |
Percentage adquired by Ferrovial subsidiary of the buyers capital |  |  | 23.99% |  |  |  |  |  |  |  |  |  | 23.99% | 23.99% |  |  |
Fair value adjustment |  |  | € 90,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
IRB Infrastructure Trust (Private InvIT) [Member] | IRB infrastructure developers limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total investment related to the acquisition |  |  | € 58,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
IRB Infrastructure Trust (Private InvIT) [Member] | India, Rupees | Toll roads division [Member] | Exchange rate interval maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange rate |  |  | 90.21 |  |  |  |  |  |  |  |  |  |  |  |  |  |
IRB Infrastructure Trust (Private InvIT) [Member] | India, Rupees | Toll roads division [Member] | Exchange rate interval minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange rate |  |  | 89.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
IRB Infrastructure Trust (Private InvIT) [Member] | India, Rupees | IRB infrastructure developers limited [Member] | Exchange rate interval maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange rate |  |  | 87.83 |  |  |  |  |  |  |  |  |  |  |  |  |  |
IRB Infrastructure Trust (Private InvIT) [Member] | GIC Private Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Ferrovials share capital related to the number of shares acquired share based remuneration schemes |  |  | 49.00% |  |  |  |  |  |  |  |  |  | 49.00% | 49.00% |  |  |
Percentage transaction |  |  | € 0.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |
FGP Topco limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate |  |  | 19.75% | 19.75% | 19.75% |  |  |  |  |  |  |  |  |  |  |  |
Total stake retain by Ferrovial for associates |  |  | 25.00% | 25.00% | 25.00% |  |  |  |  |  |  |  |  |  |  |  |
Derivatives investment in associates |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Percentage of the sale of the FGP Topco |  |  | 19.75% | 19.75% | 19.75% |  |  |  |  |  |  |  |  |  |  |  |
Increase decrease in investments in associates other |  |  |  |  |  | € 0 |  |  |  |  |  |  |  |  |  |  |
FGP Topco limited [Member] | HAH 5.25% stake divestment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of the sale of all of its remaining shares |  |  | 5.25% |  |  |  |  |  |  |  |  |  | 5.25% | 5.25% |  |  |
Approximate amount of the sale of all remaining shares | £ |  |  |  |  |  |  |  |  |  |  |  |  | £ 455 |  |  |  |
FGP Topco limited [Member] | Financial investment carried at fair value [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of the sale of the FGP Topco |  |  | 19.75% | 19.75% | 19.75% |  |  |  |  |  |  |  |  |  |  |  |
Percentage ownership interest of the Ferrovial |  |  | 5.25% | 5.25% | 5.25% |  |  |  |  |  |  |  |  |  |  |  |
Positive impacts |  |  | € 547,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
FGP Topco limited [Member] | Airports division [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of the sale of the FGP Topco |  |  | 19.75% | 19.75% | 19.75% |  |  |  |  |  |  |  |  |  |  |  |
Ferrovial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale or issue of treasury shares | £ |  | 450 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ferrovial [Member] | AGS Divestment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale or issue of treasury shares | £ |  | £ 450 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ganga Expressway Project "Ganga" [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of the adquisition |  |  | 80.40% |  |  |  |  |  |  |  |  |  | 80.40% | 80.40% |  |  |
Ganga Expressway Project "Ganga" [Member] | Toll roads division [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about investments in associates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange rate |  |  | 0.804 |  |  |  |  |  |  |  |  |  | 0.804 | 0.804 |  |  |
Proportion of ownership interest in subsidiary |  |  | 19.60% | 19.60% | 19.60% |  |  |  |  |  |  |  |  |  |  |  |

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