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Financial risk and capital management - Narrative (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 EUR (€) | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 EUR (€) | Dec. 31, 2023 CAD ($) | Dec. 31, 2021 EUR (€)
Detailed information about financial risk and capital management [Line Items] |  |  |  |  |
Cash and cash equivalents excluding infrastructure projects | € 4,653,000,000 | € 4,585,000,000 |  | $ 207 |
Cash and cash equivalents infrastructure projects | 175,000,000 | 204,000,000 |  |  |
Currency translation differences | € 139,000,000 | (125,000,000) |  |  |
Percentage that ferrovial estimates as appreciation in the value of the euro at the year end against the main currencies in which the group holds investments | 10.00% |  |  |  |
Impact on the parent company shareholders funds with a 10% depreciation in the value of the euro at the year end against the main currencies in which the group holds investments | € 322,000,000 |  |  |  |
Impact on the income statement of a 10% appreciation of the euro against other currencies | 56,000,000 | 52,000,000 |  |  |
Impact on profit loss plus 100 bps | 5,000,000 | 4,000,000 |  |  |
Cash and cash equivalents | 4,828,000,000 | 4,789,000,000 | € 5,130,000,000 |  | € 5,536,000,000
Positive coverage with impact on equity attributable to parent companies with a linear increase of 100 basis points | 63,000,000 | 109,000,000 |  |  |
Effective hedges that have a negative impact on equity due to a linear decrease of 100 basis points | 54,000,000 | 41,000,000 |  |  |
Equity attributable to owners of parent [member] |  |  |  |  |
Detailed information about financial risk and capital management [Line Items] |  |  |  |  |
Negative-positive impact on the income statement in the event of a rise in the euro and a fall in the share price |  |  | 2,800,000 |  |
Currency translation differences | (33,000,000) | (83,000,000) |  |  |
Ferrovial share price |  |  | € 1 |  |
Canada, Dollars |  |  |  |  |
Detailed information about financial risk and capital management [Line Items] |  |  |  |  |
Currency translation differences | € (12,000,000) | (34,000,000) |  |  |
Percentage of the impact on the parent company shareholders funds with a 10% depreciation in the value of the euro at the year end against the main currencies in which the group holds investments | 15.00% |  |  |  |
United States of America, Dollars |  |  |  |  |
Detailed information about financial risk and capital management [Line Items] |  |  |  |  |
Percentage of the impact on the parent company shareholders funds with a 10% depreciation in the value of the euro at the year end against the main currencies in which the group holds investments | 27.00% |  |  |  |
India, Rupees |  |  |  |  |
Detailed information about financial risk and capital management [Line Items] |  |  |  |  |
Currency translation differences | € 18,000,000 |  |  |  |
Percentage of the impact on the parent company shareholders funds with a 10% depreciation in the value of the euro at the year end against the main currencies in which the group holds investments | 35.00% |  |  |  |
Infrastructure project [Member] |  |  |  |  |
Detailed information about financial risk and capital management [Line Items] |  |  |  |  |
Undrawn credit lines | € 13,000,000 | 1,000,000 |  |  |
Total liquidity | 557,000,000 | 817,000,000 |  |  |
Impact on profit loss plus 100 bps | 2,000,000 | 1,000,000 |  |  |
Exinfrastructure project [Member] |  |  |  |  |
Detailed information about financial risk and capital management [Line Items] |  |  |  |  |
Undrawn credit lines | 652,000,000 | 789,000,000 |  |  |
Forwards hedging cash flows denominatedIn a currency other than the euro | (5,000,000) | (18,000,000) |  |  |
Impact on profit loss plus 100 bps | 3,000,000 | 3,000,000 |  |  |
Cash flows from used in decrease increase in long term restricted cash | 21,000,000 | 32,000,000 |  |  |
Exinfrastructure project [Member] | Corporate debt [Member] |  |  |  |  |
Detailed information about financial risk and capital management [Line Items] |  |  |  |  |
Total liquidity | € 5,320,000,000 | € 5,387,000,000 |  |  |

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