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Other provisions, contingent liabilities and contingent assets (Tables) | 12 Months Ended
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Dec. 31, 2024
Contingent liabilities contingent assets and commitments [Abstract] |
Disclosure of detailed information about bank guarantees and other guarantees issued by insurance companies [Table Text Block] |
(Million euro) | Dec. 2024 | Dec. 2023
Construction | 7,074 | 7,013
Toll Roads | 476 | 404
Airports | 355 | 799
Energy | 199 | 66
Other | 157 | 251
TOTAL | 8,260 | 8,533
Disclosure of guarantees for fully consolidated and equity accounted infrastructure project companies [Table Text Block] |
BENEFICIARY COMPANY (PROJECT) | GUARANTEE PURPOSE | Dec. 2024
Conc. Prisiones Lledoners | Technical guarantee to repay amounts to the bank in the event of termination of the contract. Does not cover insolvency (default) or breach by the awarding entity | 62 |
Centella | Bank guarantees to cover the achievement of various milestones and payment of any fines during the initial execution period. PCG to cover the liquidity gap up to EUR 20 million | 50 |
TOTAL GUARANTEES FOR FULLY-CONSOLIDATED INFRASTRUCTURE PROJECTS | 111 |
Disclosure of the group commitments to invest in infrastructure project company capital [Table Text Block] |
(Million euro) | 2025 | 2026 | 2027 | 2028 | 2029 | 2030 AND BEYOND | TOTAL
Toll Roads | — |  | 5 |  | — |  | — |  | — |  | — |  | 5 |
Construction | 1 |  | — |  | — |  | — |  | — |  | — |  | 1 |
Energy | 22 |  | 23 |  | — |  | 1 |  | — |  | — |  | 45 |
INVESTMENTS IN FULLY- CONSOLIDATED INFRASTRUCTURE PROJECT COMPANIES | 23 |  | 28 |  | — |  | 1 |  | — |  | — |  | 52 |
Toll Roads | 28 |  | — |  | 18 |  | — |  | — |  | — |  | 46 |
Airports | 258 |  | 71 |  | — |  | — |  | — |  | — |  | 329 |
Construction | 1 |  | — |  | — |  | — |  | — |  | — |  | 1 |
INVESTMENTS IN EQUITY- ACCOUNTED INFRASTRUCTURE PROJECT COMPANIES | 287 |  | 71 |  | 18 |  | — |  | — |  | — |  | 376 |
TOTAL INVESTMENTS IN INFRASTRUCTURE PROJECT COMPANIES | 310 |  | 99 |  | 18 |  | 1 |  | — |  | — |  | 427 |

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