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Goodwill and acquisitions (Details) - EUR (€) € in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Goodwill | € 500 | € 475 | € 479
Increase (decrease) through other changes, goodwill | 0 | 0 |
Increase (decrease) through net exchange differences, goodwill | 25 | (5) |
Goodwill Extend |  | 475 |
Construction division [Member] |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Goodwill | 140 | 135 | 132
Increase (decrease) through other changes, goodwill | 0 | 0 |
Increase (decrease) through net exchange differences, goodwill | 5 | 3 |
Construction division [Member] | Webber [Member] |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Goodwill | 69 | 65 | 67
Increase (decrease) through other changes, goodwill | 0 | 0 |
Increase (decrease) through net exchange differences, goodwill | 4 | (2) |
Construction division [Member] | Budimex S.A [Member] |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Goodwill | 71 | 70 | 65
Increase (decrease) through other changes, goodwill | 0 | 0 |
Increase (decrease) through net exchange differences, goodwill | 1 | 5 |
Toll roads division [Member] |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Goodwill | 276 | 259 | 265
Increase (decrease) through other changes, goodwill | 0 | 0 |
Increase (decrease) through net exchange differences, goodwill | 17 | (6) |
Toll roads division [Member] | I66 Express mobility partners hold LLC [Member] |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Goodwill | 276 | 259 | 265
Increase (decrease) through other changes, goodwill | 0 | 0 |
Increase (decrease) through net exchange differences, goodwill | 17 | (6) |
Airports division [Member] |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Goodwill | 27 | 27 | 27
Increase (decrease) through other changes, goodwill | 0 | 0 |
Increase (decrease) through net exchange differences, goodwill | 0 | 0 |
Airports division [Member] | Dalaman international airport [Member] |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Goodwill | 27 | 27 | 27
Increase (decrease) through other changes, goodwill | 0 | 0 |
Increase (decrease) through net exchange differences, goodwill | 0 | 0 |
Energy and mobility infrastructures division [Member] |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Goodwill | 46 | 43 | 45
Increase (decrease) through other changes, goodwill | 0 | 0 |
Increase (decrease) through net exchange differences, goodwill | 3 | (1) |
Energy and mobility infrastructures division [Member] | Power transmission services chile [Member] |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Goodwill | 46 | 43 | 45
Increase (decrease) through other changes, goodwill | 0 | 0 |
Increase (decrease) through net exchange differences, goodwill | 3 | (1) |
Energy and mobility infrastructures division [Member] | Mining services Chile |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Goodwill |  | 10 | 11
Increase (decrease) through other changes, goodwill |  | 0 |
Increase (decrease) through net exchange differences, goodwill |  | (1) |
Other division [Member] |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Goodwill | 10 | 10 | € 11
Increase (decrease) through other changes, goodwill | 0 | 0 |
Increase (decrease) through net exchange differences, goodwill | (1) | (1) |
Other division [Member] | Mining services Chile |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Goodwill | 10 | € 10 |
Increase (decrease) through other changes, goodwill | 0 |  |
Increase (decrease) through net exchange differences, goodwill | € (1) |  |

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