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Goodwill and acquisitions - Narrative (Details) - EUR (€) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2026 | Dec. 31, 2023 | Dec. 31, 2021
Disclosure of detail information about goodwill [Line Items] |  |  |  |
Percentage of reasonably possible decrease in unobservable input, entity's own equity instruments |  | 5.00% |  |
Construction division [Member] | Budimex S.A [Member] |  |  |  |
Disclosure of detail information about goodwill [Line Items] |  |  |  |
Percentage of the goodwill impairment test over its carring amount |  |  | 1086.00% |
Carring amount of the investment | € 8.91 |  | € 156,000,000 |
Carrying amount acquisition | € 141,000,000 |  |  |
Construction division [Member] | Webber [Member] |  |  |  |
Disclosure of detail information about goodwill [Line Items] |  |  |  |
Percentage of the goodwill impairment test over its carring amount | 245.00% |  | 174.00% |
Carring amount of the investment | € 395,000,000 |  | € 362,000,000 |
Percentage of the adquisition | 8.60% |  |  |
Rate before taxes used to discount the flows goodwill impairment test | 9.90% |  |  |
Toll roads division [Member] | I66 Express mobility partners hold LLC [Member] |  |  |  |
Disclosure of detail information about goodwill [Line Items] |  |  |  |
Percentage of the goodwill impairment test over its carring amount | 13.00% |  | 20.00% | 5.704%
Carring amount of the investment | € 2,281,000,000 |  | € 1,971,000,000 |
Rate before taxes used to discount the flows goodwill impairment test | 9.50% |  |  |
Rate used to discount the flows goodwill impairment test | 8.50% |  |  |
Energy and mobility infrastructures division [Member] | Power transmission services chile [Member] |  |  |  |
Disclosure of detail information about goodwill [Line Items] |  |  |  |
Percentage of the goodwill impairment test over its carring amount |  |  | 79.00% |
Carring amount of the investment | € 38,000,000 |  | € 34,000,000 |
Rate before taxes used to discount the flows goodwill impairment test | 10.10% |  |  |
Rate used to discount the flows goodwill impairment test | 9.90% |  |  |
Percentage of the share price over its carring amount impairment test | 57.00% |  |  |
Energy and mobility infrastructures division [Member] | Mining services Chile |  |  |  |
Disclosure of detail information about goodwill [Line Items] |  |  |  |
Percentage of the goodwill impairment test over its carring amount | 141.00% |  |  |
Carring amount of the investment | € 29,000,000 |  | € 16,000,000 |
Percentage of the adquisition |  |  | 12.00% |
Rate before taxes used to discount the flows goodwill impairment test | 18.60% |  |  |
Rate used to discount the flows goodwill impairment test | 14.70% |  |  |
Airports division [Member] | Dalaman international airport [Member] |  |  |  |
Disclosure of detail information about goodwill [Line Items] |  |  |  |
Percentage of the goodwill impairment test over its carring amount | 24.00% |  | 26.00% |
Carring amount of the investment | € 180,000,000 |  | € 146,000,000 |
Rate before taxes used to discount the flows goodwill impairment test | 12.70% |  |  |
Rate used to discount the flows goodwill impairment test | 10.20% |  |  |

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