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Financial derivatives at fair value flow maturities- Narrative (Details) £ in Millions, zł in Millions, $ in Millions, $ in Millions | 12 Months Ended |  |  |  |
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Dec. 31, 2024 EUR (€) | Dec. 31, 2008 | Dec. 31, 2032 EUR (€) | Dec. 31, 2025 EUR (€) | Dec. 31, 2024 USD ($) | Dec. 31, 2024 PLN (zł) | Dec. 31, 2024 GBP (£) | Dec. 31, 2024 CAD ($) | Dec. 31, 2023 EUR (€)
Detail of information about derivative financial instrument at fair value [Line Items] |  |  |  |  |  |  |  |  |
Notional amount | € 6,438,000,000 |  |  |  |  |  |  |  | € 4,990,000
Interest hedges on project debt modify their fair value recorded in reserves | 16,000,000 |  |  |  |  |  |  |  |
Interest ratehedges on project debt movement in settlements and accruals impact on the financial result | (1,190,000) |  |  |  |  |  |  |  |
Interest rate hedges on the movement of project debt in settlements and accumulations | (460,000) |  |  |  |  |  |  |  |
Annual inflation rate related to the index linked swap arranged by autema toll road |  | 2.50% |  |  |  |  |  |  |
Index linked swap arranged by autema toll road impact on reserves | 12,000,000 |  |  |  |  |  |  |  |
Index linked swap arranged by autema toll road impact on results | 6,000,000 |  |  |  |  |  |  |  |
Interest rate derivatives [Member] |  |  |  |  |  |  |  |  |
Detail of information about derivative financial instrument at fair value [Line Items] |  |  |  |  |  |  |  |  |
Notional amount | 1,272,000,000 |  |  |  |  |  |  |  |
Cross currency swaps [Member] |  |  |  |  |  |  |  |  |
Detail of information about derivative financial instrument at fair value [Line Items] |  |  |  |  |  |  |  |  |
Notional amount | 1,712,000,000 |  |  |  | $ 260 |  |  |  |
Derivative financial liabilities |  |  | € 139,000,000 |  |  |  |  |  |
Interest rate component of the derivatives treated as a hedging cost | 64,000,000 |  |  |  |  |  |  |  |
Impact of the hedging of the investment recognized as currency translation differences | (109,000,000) |  |  |  |  |  |  |  |
Cross currency swaps changes in their fair value impact on reserves | (1,000,000) |  |  |  |  |  |  |  |
Cross currency swaps [Member] | Corporate cross currency swaps [Member] |  |  |  |  |  |  |  |  |
Detail of information about derivative financial instrument at fair value [Line Items] |  |  |  |  |  |  |  |  |
Notional amount |  |  |  | € 250,000,000 |  |  |  |  |
Changes in the fair value of foreign exchange swaps | 7,000,000 |  |  |  |  |  |  |  |
Cross currency swaps changes in their fair value impact on cash | (7,000,000) |  |  |  |  |  |  |  |
Cross currency swaps [Member] | Designed to protect against the volatility of future cash flows in foreign currencies [Member] | Poland, Zlotych |  |  |  |  |  |  |  |  |
Detail of information about derivative financial instrument at fair value [Line Items] |  |  |  |  |  |  |  |  |
Notional amount | zł |  |  |  |  |  | zł 142 |  |  |
Cross currency swaps [Member] | At fair value [member] |  |  |  |  |  |  |  |  |
Detail of information about derivative financial instrument at fair value [Line Items] |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  | (13,000,000)
Derivative financial liabilities | 40,000,000 |  |  |  |  |  |  |  |
Impact of the hedging of the investment recognized as currency translation differences | 1,000,000 |  |  |  |  |  |  |  |
Foreign exchange derivatives member [Member] |  |  |  |  |  |  |  |  |
Detail of information about derivative financial instrument at fair value [Line Items] |  |  |  |  |  |  |  |  |
Hedges of risk due to changes in fair value recorded in currency translation differences | 23,000,000 |  |  |  |  |  |  |  |
Exchange rate risk hedges movement in settlements and accruals impact on the financial result | (6,000,000) |  |  |  |  |  |  |  |
Exchange rate risk hedges movementIn settlements and accrualsImpact on cash | (1,000,000) |  |  |  |  |  |  |  |
Foreign exchange derivatives member [Member] | Designed to hedge the investment that the groups CAD investment [Member] |  |  |  |  |  |  |  |  |
Detail of information about derivative financial instrument at fair value [Line Items] |  |  |  |  |  |  |  |  |
Notional amount | 485,000,000 |  |  |  |  |  |  | $ 732 |
Foreign exchange derivatives member [Member] | Designed to protect against the volatility of future cash flows in foreign currencies [Member] |  |  |  |  |  |  |  |  |
Detail of information about derivative financial instrument at fair value [Line Items] |  |  |  |  |  |  |  |  |
Notional amount | 2,287,000,000 |  |  |  |  |  |  |  |
Foreign exchange derivatives member [Member] | Designed to protect against the volatility of future cash flows in foreign currencies [Member] | United States of America, Dollars |  |  |  |  |  |  |  |  |
Detail of information about derivative financial instrument at fair value [Line Items] |  |  |  |  |  |  |  |  |
Notional amount | $ |  |  |  |  | $ 976 |  |  |  |
Foreign exchange derivatives member [Member] | Designed to protect against the volatility of future cash flows in foreign currencies [Member] | United Kingdom, Pounds |  |  |  |  |  |  |  |  |
Detail of information about derivative financial instrument at fair value [Line Items] |  |  |  |  |  |  |  |  |
Notional amount | £ |  |  |  |  |  |  | £ 1,068 |  |
Foreign exchange derivatives member [Member] | At fair value [member] |  |  |  |  |  |  |  |  |
Detail of information about derivative financial instrument at fair value [Line Items] |  |  |  |  |  |  |  |  |
Hedges of risk due to changes in fair value recorded in currency translation differences | (45,000,000) |  |  |  |  |  |  |  |
Expense related to options that are not classified as hedge accounting | (4,000,000) |  |  |  |  |  |  |  |
Foreign exchange derivatives member [Member] | At fair value [member] | Designed to hedge the investment that the groups CAD investment [Member] |  |  |  |  |  |  |  |  |
Detail of information about derivative financial instrument at fair value [Line Items] |  |  |  |  |  |  |  |  |
Notional amount | (5,000,000) |  |  |  |  |  |  |  |
Equity swaps [Member] | Equity swaps corporate [Member] |  |  |  |  |  |  |  |  |
Detail of information about derivative financial instrument at fair value [Line Items] |  |  |  |  |  |  |  |  |
Notional amount | 54,000,000 |  |  |  |  |  |  |  |
Derivative financial liabilities | 29,000,000 |  |  |  |  |  |  |  |
Ferrovial share price | 41 |  |  |  |  |  |  |  | 33
Variation of net financial derivatives with effect on final profit and loss | (2,000,000) |  |  |  |  |  |  |  |
Variation of net financial derivatives with effect on cash | € (6,000,000) |  |  |  |  |  |  |  |
Number of shares equivalent to their national value | 2,042,000 |  |  |  |  |  |  |  |
Variation of net financial derivatives fair value effect on profit and loss | € 17,000,000 |  |  |  |  |  |  |  |
Derivative financial assets [Member] |  |  |  |  |  |  |  |  |
Detail of information about derivative financial instrument at fair value [Line Items] |  |  |  |  |  |  |  |  |
Notional amount | 3,170,000,000 |  |  |  |  |  |  |  |
Derivative financial assets [Member] | Equity swaps corporate [Member] |  |  |  |  |  |  |  |  |
Detail of information about derivative financial instrument at fair value [Line Items] |  |  |  |  |  |  |  |  |
Notional amount | 54,000,000 |  |  |  |  |  |  |  |
Derivative financial assets [Member] | Corporate cross currency swaps [Member] |  |  |  |  |  |  |  |  |
Detail of information about derivative financial instrument at fair value [Line Items] |  |  |  |  |  |  |  |  |
Notional amount | 250,000,000 |  |  |  |  |  |  |  |
Derivative financial assets [Member] | At fair value [member] |  |  |  |  |  |  |  |  |
Detail of information about derivative financial instrument at fair value [Line Items] |  |  |  |  |  |  |  |  |
Derivative financial assets [Member] | 241,000,000 |  |  |  |  |  |  |  |
Derivative financial assets [Member] | At fair value [member] | Equity swaps corporate [Member] |  |  |  |  |  |  |  |  |
Detail of information about derivative financial instrument at fair value [Line Items] |  |  |  |  |  |  |  |  |
Derivative financial assets [Member] | 29,000,000 |  |  |  |  |  |  |  |
Derivative financial assets [Member] | At fair value [member] | Corporate cross currency swaps [Member] |  |  |  |  |  |  |  |  |
Detail of information about derivative financial instrument at fair value [Line Items] |  |  |  |  |  |  |  |  |
Derivative financial assets [Member] | 1,000,000 |  |  |  |  |  |  |  |
Derivative financial liabilities [Member] |  |  |  |  |  |  |  |  |
Detail of information about derivative financial instrument at fair value [Line Items] |  |  |  |  |  |  |  |  |
Notional amount | 3,268,000,000 |  |  |  |  |  |  |  |
Derivative financial liabilities [Member] | At fair value [member] |  |  |  |  |  |  |  |  |
Detail of information about derivative financial instrument at fair value [Line Items] |  |  |  |  |  |  |  |  |
Derivative financial liabilities | (132,000,000) |  |  |  |  |  |  |  |
Infrastructure project [Member] |  |  |  |  |  |  |  |  |
Detail of information about derivative financial instrument at fair value [Line Items] |  |  |  |  |  |  |  |  |
Notional amount | 8,554,000,000 |  |  |  |  |  |  |  | 8,070,000,000
Infrastructure project [Member] | Interest rate derivatives [Member] |  |  |  |  |  |  |  |  |
Detail of information about derivative financial instrument at fair value [Line Items] |  |  |  |  |  |  |  |  |
Interest rate hedges on project debt | (58,000,000) |  |  |  |  |  |  |  | (39,000,000)
Exinfrastructure project [Member] |  |  |  |  |  |  |  |  |
Detail of information about derivative financial instrument at fair value [Line Items] |  |  |  |  |  |  |  |  |
Notional amount | 2,865,000,000 |  |  |  |  |  |  |  | 3,437,000,000
Exinfrastructure project [Member] | Corporate debt [Member] |  |  |  |  |  |  |  |  |
Detail of information about derivative financial instrument at fair value [Line Items] |  |  |  |  |  |  |  |  |
Notional amount | 2,839,000,000 |  |  |  |  |  |  |  | 3,391,000,000
Exinfrastructure project [Member] | Interest rate derivatives [Member] |  |  |  |  |  |  |  |  |
Detail of information about derivative financial instrument at fair value [Line Items] |  |  |  |  |  |  |  |  |
Amount of Ferrovials pre-hedge to cover the refinancing of the bond | 165,000,000 |  |  |  |  |  |  |  |
Exinfrastructure project [Member] | Cross currency swaps [Member] | At fair value [member] | Corporate bonds and debentures [Member] | Corporate debt [Member] |  |  |  |  |  |  |  |  |
Detail of information about derivative financial instrument at fair value [Line Items] |  |  |  |  |  |  |  |  |
Notional amount | € 1,490,000 |  |  |  |  |  |  |  |
Derivative financial liabilities |  |  |  |  |  |  |  |  | € (13,000,000)

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