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Corporate income tax and deferred taxes credits - Narrative (Details) £ in Millions, $ in Millions | 12 Months Ended |  |  |
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Dec. 31, 2024 EUR (€) | Dec. 31, 2024 CAD ($) | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 EUR (€) | Dec. 31, 2024 GBP (£) | Dec. 31, 2024 EUR (€) | Dec. 31, 2023 GBP (£) | Dec. 31, 2023 EUR (€) | Dec. 31, 2021
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Tax expense (income) | € 145,000,000 |  | € 115,000,000 | € 30,000,000 |  |  |  |  |
Deferred tax assets |  |  |  |  |  | € 1,159,000,000 |  | € 1,006,000,000 |
Deferred tax liabilities |  |  |  |  |  | 1,239,000,000 |  | 1,086,000,000 |
Additional positive impact due to the resolution of the ruling related to Royal Decree-Law 3/2016 (RDL 3/2016) for years after 2023 |  |  |  |  |  | 0.70 |  |  |
Adjustments to reconcile profit (loss) | € (1,897,000,000) |  | 650,000,000 | 695,000,000 |  |  |  |  |
Tax rate | 15.00% | 15.00% |  |  |  |  |  |  |
Tax rate effect from change in tax rate | 15.00% | 15.00% |  |  |  |  |  |  |
Tax rate effect of foreign tax rates | 15.00% | 15.00% |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | 6,438,000,000 |  | 4,990,000 |
Provisions |  |  |  |  | £ 22 | € 1,311,000,000 | £ 40 | 1,279,000,000 |
Deferred tax expense (income) | € (28,000,000) |  | 65,000,000 | 42,000,000 |  |  |  |  |
Grupo Serveo, S.L. |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Cost of sales | 0.2478 |  |  |  |  |  |  |  |
IRB infrastructure developers limited [Member] |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Percentage of the adquisition |  |  |  |  | 5.00% | 5.00% |  |  | 24.86%
Cost of sales | € 215,000,000 |  |  |  |  |  |  |  |
FGP Topco limited [Member] |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Percentage of the sale of the FGP Topco | 19.75% | 19.75% |  |  |  |  |  |  |
FGP Topco limited [Member] | Financial investment carried at fair value [Member] |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Percentage of the sale of the FGP Topco | 19.75% | 19.75% |  |  |  |  |  |  |
IRB infrastructure developers limited [Member] |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale or issue of treasury shares | € 16,000,000 |  |  |  |  |  |  |  |
Investment property completed |  |  |  |  |  | € 0.05 |  |  |
Construction division [Member] |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Tax expense (income) | 142,000,000 |  | 65,000,000 | 6,000,000 |  |  |  |  |
Toll roads division [Member] |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Tax expense (income) | 110,000,000 |  | 55,000,000 | 39,000,000 |  |  |  |  |
Tax losses carry forward [Member] |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Implied the recognition of future net operating losses | 23,000,000 |  |  |  |  |  |  |  |
Maximum tax credit |  |  |  |  |  | 17,000,000 |  |  |
SPAIN | Tax losses carry forward [Member] |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Implied the recognition of future net operating losses | 12,000,000 |  |  |  |  |  |  |  |
Maximum tax credit |  |  |  |  |  | 10,000,000 |  |  |
Increase decrease in deferred tax assets | (22,000,000) |  |  |  |  |  |  |  |
CANADA |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Estimates the pending regularization | 2,200,000 | $ 3.3 |  |  |  |  |  |  |
CANADA | IRB infrastructure developers limited [Member] |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale or issue of treasury shares | 16,000,000 |  |  |  |  |  |  |  |
UNITED STATES |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Provisions |  |  |  |  |  | 8,000,000 |  | 26,000,000 |
UNITED STATES | Tax losses carry forward [Member] |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Provisions |  |  |  |  |  | 8,000,000 |  |  |
NETHERLANDS |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Tax credits recognized in an amount equal to the excess liability for temporary differences over the asset for temporary differences USA |  |  |  |  |  | 10,000,000 |  |  |
Turkey, New Lira | Tax losses carry forward [Member] |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Increase decrease in deferred tax assets | 31,000,000 |  |  |  |  |  |  |  |
POLAND |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Adjustments for effect of different tax rates of subsidiaries operating in other jurisdictions | 13,000,000 |  |  |  |  |  |  |  |
POLAND | Construction division [Member] |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Provisions |  |  |  |  |  | (17,000,000) |  |  |
Total not used by group companies [Member] |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | 537,000,000 |  |  |
Other tax credits [Member] |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | 20,000,000 |  |  |
Deferred taxes assets [Member] |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Deferred tax assets |  |  |  | 784,000,000 |  | 1,159,000,000 |  | 1,006,000,000 |
Relate mostly to deferred tax assets arising from financial derivatives, | 198,000,000 |  | 48,000,000 |  |  |  |  |  |
Deferred taxes assets [Member] | Tax credits [Member] |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Deferred tax assets |  |  |  | 370,000,000 |  | 537,000,000 |  | 503,000,000 |
Deferred taxes assets [Member] | Differences between tax and accounting [Member] |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Deferred tax assets |  |  |  | 274,000,000 |  | 377,000,000 |  | 422,000,000 |
Deferred taxes assets [Member] | Differences between tax and accounting [Member] | Provisions that do not have tax effects until they are applied [Member] |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Deferred tax assets |  |  |  |  |  | 198,000,000 |  | 195,000,000 |
Deferred taxes assets [Member] | Differences between tax and accounting [Member] | Revenue recognition [Member] |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Deferred tax assets |  |  |  |  |  | 238,000,000 |  |  |
Deferred taxes assets [Member] | Differences between tax and accounting [Member] | Revenue recognition [Member] | Construction division [Member] |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Deferred tax assets |  |  |  |  |  |  |  | 216,000,000 |
Deferred taxes assets [Member] | Differences between tax and accounting [Member] | Accelerated book depreciation amortization [Member] | Construction division [Member] |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Deferred tax assets |  |  |  |  |  | 16,000,000 |  | 7,000,000 |
Deferred taxes assets [Member] | Equity measurement adjustment [Member] |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Deferred tax assets |  |  |  | 86,000,000 |  | 197,000,000 |  | 48,000,000 |
Deferred taxes assets [Member] | Other items [Member] |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Deferred tax assets |  |  |  | 55,000,000 |  | 48,000,000 |  | 33,000,000 |
Deferred taxes liabilities [Member] |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Deferred tax liabilities |  |  |  | 924,000,000 |  | 1,239,000,000 |  | 1,086,000,000 |
Deferred taxes liabilities [Member] | Differences between tax and accounting [Member] |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Deferred tax assets |  |  |  |  |  | 322,000,000 |  | 242,000,000 |
Deferred tax liabilities |  |  |  | 378,000,000 |  | 548,000,000 |  | 561,000,000 |
Deferred taxes liabilities [Member] | Differences between tax and accounting [Member] | Toll roads division [Member] |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Deferred tax assets |  |  |  |  |  | 234,000,000 |  | 201,000,000 |
Deferred taxes liabilities [Member] | Equity measurement adjustment [Member] |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Deferred tax liabilities |  |  |  | 64,000,000 |  | 234,000,000 |  | 69,000,000 |
Deferred taxes liabilities [Member] | Equity measurement adjustment [Member] | Deferred taxes arising from equity [Member] |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Deferred tax liabilities |  |  |  |  |  | 234,000,000 |  | 69,000,000 |
Deferred taxes liabilities [Member] | Other items [Member] |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Deferred tax liabilities |  |  |  | 145,000,000 |  | 134,000,000 |  | 126,000,000 |
Deferred taxes liabilities [Member] | Deferred taxes on goodwill [Member] |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Deferred tax assets |  |  |  |  |  | 18,000,000 |  | 21,000,000 |
Deferred tax liabilities |  |  |  | 21,000,000 |  | 22,000,000 |  | 22,000,000 |
Deferred taxes liabilities [Member] | Deferred fair value adjustment [Member] |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Deferred tax liabilities |  |  |  | € 315,000,000 |  | 301,000,000 |  | 308,000,000 |
Deferred taxes liabilities [Member] | Deferred fair value adjustment [Member] | Dalaman international airport [Member] |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Deferred tax assets |  |  |  |  |  | € 31,000,000 |  | 51,000,000 |
Percentage of the adquisition |  |  |  |  | 60.00% | 60.00% |  |  |
Deferred taxes liabilities [Member] | Deferred fair value adjustment [Member] | Toll roads division [Member] | I66 Express mobility partners hold LLC [Member] | For the difference between tax and book values following the revaluation of the I66 highway asset [Member] |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Deferred tax assets |  |  |  |  |  | € 270,000,000 |  | 257,000,000 |
Profit (loss) recognised on exchanging construction services for financial asset | € 36,000,000 |  | 35,000,000 |  |  |  |  |  |
Deferred taxes liabilities [Member] | CANADA | Other items [Member] | Deferred taxes arising from equity [Member] |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Deferred tax liabilities |  |  |  |  |  | 11,000,000 |  | € 72,000,000 |
Prior year tax [Member] |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Additional positive impact due to the resolution of the ruling related to Royal Decree-Law 3/2016 (RDL 3/2016) for years after 2023 |  |  |  |  |  | € 31,000,000 |  |  |
Main adjustments for theoretical income tax in USA [Member] | UNITED STATES |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Adjustments for current tax of prior periods |  |  | (9,000,000) |  |  |  |  |  |
Main adjustments for theoretical income tax in Netherlands [Member] | NETHERLANDS |  |  |  |  |  |  |  |  |
Detail of information about corporate income tax and deferred taxes [Line Items] |  |  |  |  |  |  |  |  |
Adjustments for current tax of prior periods |  |  | € (7,000,000) |  |  |  |  |  |

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