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Appendix I. Associate companies (equity-accounted companies) (million euro) (Details) - EUR (€) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of associates [line items] |  |  |  |
Investments in associates accounted for using equity method | € 3,023,000,000 | € 3,023,000,000 | € 2,038,000,000 | € 1,951,000,000
Assets |  | 28,999,000,000 | 26,318,000,000 |
Liabilities |  | 20,879,000,000 | 20,439,000,000 |
Revenue | 9,147,000,000 | 9,147,000,000 | 8,514,000,000 | 7,551,000,000
Profit (loss) |  | € 3,490,000,000 | 511,000,000 | 305,000,000
407 International Inc [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate |  | 43.23% |  |
Investments in associates accounted for using equity method | 778,000,000 |  | 928,000,000 | 1,063,000,000
IRB infrastructure developers limited [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate |  | 19.86% |  |
Investments in associates accounted for using equity method | 315,000,000 |  | 376,000,000 | 377,000,000
JFKNTO sponsor aggregator LLC [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate |  | 49.00% |  |
Investments in associates accounted for using equity method | 1,006,000,000 |  | 471,000,000 | 235,000,000
Construction division [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Revenue | 7,234,000,000 | € 7,234,000,000 | 6,869,000,000 | 6,280,000,000
Profit (loss) |  | 258,000,000 | 98,000,000 | 65,000,000
Toll roads division [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Revenue | 1,256,000,000 | 1,256,000,000 | 1,085,000,000 | 780,000,000
Profit (loss) |  | € 663,000,000 | 548,000,000 | 157,000,000
Toll roads division [Member] | 407 International Inc [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate |  | 43.23% |  |
Toll roads division [Member] | JFKNTO sponsor aggregator LLC [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate |  | 49.00% |  |
Airports division [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Revenue | € 91,000,000 |  | 80,000,000 | 54,000,000
CANADA |  |  |  |
Disclosure of associates [line items] |  |  |  |
Revenue |  | € 246,000,000 | 161,000,000 | 100,000,000
CANADA | Construction division [Member] | Ontario transit groupInc [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate |  | 50.00% |  |
Investments in associates accounted for using equity method |  | € 0 |  |
Assets |  | 1,046,000,000 |  |
Liabilities |  | 1,078,000,000 |  |
Revenue |  | 409,000,000 |  |
Profit (loss) |  | € 0 |  |
CANADA | Toll roads division [Member] | 407 International Inc [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate |  | 43.20% |  |
Investments in associates accounted for using equity method |  | € 778,000,000 |  |
Assets |  | 3,866,000,000 |  |
Liabilities |  | 8,029,000,000 |  |
Revenue |  | 1,151,000,000 |  |
Profit (loss) |  | 467,000,000 |  |
SPAIN |  |  |  |
Disclosure of associates [line items] |  |  |  |
Revenue |  | € 1,582,000,000 | 1,475,000,000 | 1,154,000,000
SPAIN | Construction division [Member] | Via olmedo pedralba sa [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate |  | 7.20% |  |
Investments in associates accounted for using equity method |  | € 1,000,000 |  |
Assets |  | 5,000,000 |  |
Liabilities |  | 2,000,000 |  |
Revenue |  | 5,000,000 |  |
Profit (loss) |  | € 0 |  |
SPAIN | Construction division [Member] | Boremer S.A. [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate |  | 50.00% |  |
Investments in associates accounted for using equity method |  | € 1,000,000 |  |
Assets |  | 2,000,000 |  |
Liabilities |  | 1,000,000 |  |
Revenue |  | 0 |  |
Profit (loss) |  | € 0 |  |
SPAIN | Toll roads division [Member] | Bip & drive sa [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate |  | 25.00% |  |
Investments in associates accounted for using equity method |  | € 6,000,000 |  |
Assets |  | 38,000,000 |  |
Liabilities |  | 13,000,000 |  |
Revenue |  | 18,000,000 |  |
Profit (loss) |  | € 4,000,000 |  |
SPAIN | Toll roads division [Member] | Empresa de mantenimiento y explotación m30 sa [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate |  | 50.00% |  |
Investments in associates accounted for using equity method |  | € (34,000,000) |  |
Assets |  | 238,000,000 |  |
Liabilities |  | 238,000,000 |  |
Revenue |  | 37,000,000 |  |
Profit (loss) |  | € 10,000,000 |  |
SPAIN | Toll roads division [Member] | Madrid calle 30 S.A. [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate |  | 20.00% |  |
Investments in associates accounted for using equity method |  | € 56,000,000 |  |
Assets |  | 730,000,000 |  |
Liabilities |  | 169,000,000 |  |
Revenue |  | 158,000,000 |  |
Profit (loss) |  | 68,000,000 |  |
UNITED STATES |  |  |  |
Disclosure of associates [line items] |  |  |  |
Revenue |  | € 3,271,000,000 | 2,879,000,000 | 2,906,000,000
UNITED STATES | Construction division [Member] | Pepper lawson horizonIntl group [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate |  | 70.00% |  |
Investments in associates accounted for using equity method |  | € 0 |  |
Assets |  | 0 |  |
Liabilities |  | 0 |  |
Revenue |  | 1,000,000 |  |
Profit (loss) |  | € 0 |  |
UNITED STATES | Construction division [Member] | ConnectedWorks, LLC |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate |  | 40.00% |  |
Investments in associates accounted for using equity method |  | € 0 |  |
Assets |  | 0 |  |
Liabilities |  | 0 |  |
Revenue |  | 0 |  |
Profit (loss) |  | € 0 |  |
UNITED STATES | Airports division [Member] | JFKNTO sponsor aggregator LLC [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate |  | 51.00% |  |
Investments in associates accounted for using equity method |  | € 1,006,000,000 |  |
Assets |  | 10,436,000,000 |  |
Liabilities |  | 8,547,000,000 |  |
Revenue |  | 68,000,000 |  |
Profit (loss) |  | 7,000,000 |  |
POLAND |  |  |  |
Disclosure of associates [line items] |  |  |  |
Revenue |  | € 2,119,000,000 | 2,160,000,000 | 1,842,000,000
POLAND | Construction division [Member] | Pphu promos spzoo [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate |  | 26.30% |  |
Investments in associates accounted for using equity method |  | € 1,000,000 |  |
Assets |  | 3,000,000 |  |
Liabilities |  | 1,000,000 |  |
Revenue |  | 3,000,000 |  |
Profit (loss) |  | € 0 |  |
AUSTRALIA | Toll roads division [Member] | Nexus infrastructure holdings unit trust [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate |  | 40.00% |  |
Investments in associates accounted for using equity method |  | € 3,000,000 |  |
Assets |  | 18,000,000 |  |
Liabilities |  | 0 |  |
Revenue |  | 0 |  |
Profit (loss) |  | € 0 |  |
AUSTRALIA | Toll roads division [Member] | Nexus infr unit trust toowoomba [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate |  | 100.00% |  |
Investments in associates accounted for using equity method |  | € 10,000,000 |  |
Assets |  | 37,000,000 |  |
Liabilities |  | 16,000,000 |  |
Revenue |  | 37,000,000 |  |
Profit (loss) |  | € 3,000,000 |  |
AUSTRALIA | Toll roads division [Member] | Nexus infrastructure holdings pty ltd [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate |  | 40.00% |  |
Investments in associates accounted for using equity method |  | € 0 |  |
Assets |  | 0 |  |
Liabilities |  | 0 |  |
Revenue |  | 0 |  |
Profit (loss) |  | € 0 |  |
AUSTRALIA | Toll roads division [Member] | Nexus Infrastructure PTY Ltd |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate |  | 100.00% |  |
Investments in associates accounted for using equity method |  | € 0 |  |
Assets |  | 0 |  |
Liabilities |  | 0 |  |
Revenue |  | 0 |  |
Profit (loss) |  | € 0 |  |
AUSTRALIA | Toll roads division [Member] | Netflow osars western gp [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate |  | 50.00% |  |
Investments in associates accounted for using equity method |  | € 38,000,000 |  |
Assets |  | 151,000,000 |  |
Liabilities |  | 74,000,000 |  |
Revenue |  | 25,000,000 |  |
Profit (loss) |  | € 3,000,000 |  |
COLOMBIA | Toll roads division [Member] | Concesionaria ruta del cacao sas [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate |  | 30.00% |  |
Investments in associates accounted for using equity method |  | € 27,000,000 |  |
Assets |  | 736,000,000 |  |
Liabilities |  | 644,000,000 |  |
Revenue |  | 139,000,000 |  |
Profit (loss) |  | € 22,000,000 |  |
INDIA | Toll roads division [Member] | IRB infrastructure developers limited [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate |  | 19.90% |  |
Investments in associates accounted for using equity method |  | € 315,000,000 |  |
Assets |  | 5,025,000,000 |  |
Liabilities |  | 3,463,000,000 |  |
Revenue |  | 894,000,000 |  |
Profit (loss) |  | € 50,000,000 |  |
INDIA | Toll roads division [Member] | I MMK Toll Road Private Limited |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate |  | 51.00% |  |
Investments in associates accounted for using equity method |  | € 0 |  |
Assets |  | 1,000,000 |  |
Liabilities |  | 0 |  |
Revenue |  | 0 |  |
Profit (loss) |  | € 0 |  |
INDIA | Toll roads division [Member] | II MMK Toll Road Private Limited |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate |  | 24.00% |  |
Investments in associates accounted for using equity method |  | € 0 |  |
Assets |  | 0 |  |
Liabilities |  | 0 |  |
Revenue |  | 0 |  |
Profit (loss) |  | € 0 |  |
INDIA | Toll roads division [Member] | I IRB Infrastructure Trust |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate |  | 51.00% |  |
Investments in associates accounted for using equity method |  | € 704,000,000 |  |
Assets |  | 4,800,000,000 |  |
Liabilities |  | 3,107,000,000 |  |
Revenue |  | 243,000,000 |  |
Profit (loss) |  | € (24,000,000) |  |
INDIA | Toll roads division [Member] | II IRB Infrastructure Trust |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate |  | 24.00% |  |
Investments in associates accounted for using equity method |  | € 0 |  |
Assets |  | 0 |  |
Liabilities |  | 0 |  |
Revenue |  | 0 |  |
Profit (loss) |  | 0 |  |
UNITED KINGDOM |  |  |  |
Disclosure of associates [line items] |  |  |  |
Revenue |  | € 809,000,000 | € 771,000,000 | € 708,000,000
UNITED KINGDOM | Toll roads division [Member] | Zero by pass holdings ltd [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate |  | 35.00% |  |
Investments in associates accounted for using equity method |  | € 0 |  |
Assets |  | 0 |  |
Liabilities |  | 0 |  |
Revenue |  | 0 |  |
Profit (loss) |  | € 0 |  |
UNITED KINGDOM | Toll roads division [Member] | Zero bypass Ltd [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate |  | 100.00% |  |
Investments in associates accounted for using equity method |  | € 13,000,000 |  |
Assets |  | 944,000,000 |  |
Liabilities |  | 908,000,000 |  |
Revenue |  | 36,000,000 |  |
Profit (loss) |  | € 3,000,000 |  |
UNITED KINGDOM | Toll roads division [Member] | River linx holdings ltd [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate |  | 22.50% |  |
Investments in associates accounted for using equity method |  | € 0 |  |
Assets |  | 0 |  |
Liabilities |  | 0 |  |
Revenue |  | 0 |  |
Profit (loss) |  | € 0 |  |
UNITED KINGDOM | Toll roads division [Member] | RiverLinx Ltd [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate |  | 100.00% |  |
Investments in associates accounted for using equity method |  | € 65,000,000 |  |
Assets |  | 1,820,000,000 |  |
Liabilities |  | 1,528,000,000 |  |
Revenue |  | 204,000,000 |  |
Profit (loss) |  | € 7,000,000 |  |
UNITED KINGDOM | Toll roads division [Member] | Sociedad Concesionaria Anillo Vial, S.A. |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate |  | 35.00% |  |
Investments in associates accounted for using equity method |  | € 14,000,000 |  |
Assets |  | 0 |  |
Liabilities |  | 0 |  |
Revenue |  | 0 |  |
Profit (loss) |  | € 0 |  |
QATAR | Airports division [Member] | FMM Company LLC [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate |  | 49.00% |  |
Investments in associates accounted for using equity method |  | € 18,000,000 |  |
Assets |  | 78,000,000 |  |
Liabilities |  | 38,000,000 |  |
Revenue |  | 109,000,000 |  |
Profit (loss) |  | € 14,000,000 |  |

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