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Investments in infrastructure projects (Tables) | 12 Months Ended
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Dec. 31, 2024
Investment in infrastructure projects [Abstract] |
Disclosure of intangible asset model [Table Text Block] |
(Million euro) | BALANCE AT 01/01/2024 | TOTAL ADDITIONS |  | FOREIGN EXCHANGE EFFECT |  | BALANCE AT 12/31/2024
Spanish toll roads | 721 |  | 3 |  |  | — |  |  | 724 |
US toll roads | 12,823 |  | 76 |  |  | 858 |  |  | 13,757 |
Other toll roads | 4 |  | — |  |  | — |  |  | 4 |
Toll road investment | 13,549 |  | 79 |  | 858 |  |  | 14,485 |
Accumulated depreciation | (834) |  | (209) |  |  | (46) |  |  | (1,089) |
Net investment in toll roads | 12,715 |  | (130) |  |  | 812 |  |  | 13,396 |
Investment in other infrastructure projects | 650 |  | — |  |  | — |  |  | 650 |
Depreciation of other infrastructure projects | (34) |  | (24) |  |  | — |  |  | (58) |
Total net investment in other infrastructure projects | 616 |  | (24) |  |  | — |  |  | 592 |
TOTAL INVESTMENT | 14,199 |  | 79 |  | 858 |  |  | 15,135 |
TOTAL DEPRECIATION AND PROVISION | (867) |  | (233) |  | (46) |  |  | (1,146) |
TOTAL NET INVESTMENT | 13,333 |  | (154) |  |  | 812 |  |  | 13,989 |
(Million euro) | BALANCE AT 01/01/2023 | TOTAL ADDITIONS | TOTAL DISPOSALS | FOREIGN EXCHANGE EFFECT | CONSOLIDATION SCOPE CHANGES AND TRANSFERS | BALANCE AT 12/31/2023
Spanish toll roads | 714 |  | 7 | — |  | — |  | — |  | 721 |
US toll roads | 12,547 |  | 670 | (1) |  | (393) |  | — |  | 12,823 |
Other toll roads | 391 |  | — |  | — |  | — |  | (387) |  | 4 |
Toll road investment | 13,653 |  | 677 | (1) |  | (393) |  | (387) |  | 13,549 |
Accumulated depreciation/amortization | (781) |  | (201) |  | — |  | 16 |  | 132 |  | (834) |
Net investment in toll roads | 12,872 |  | 476 |  | (1) |  | (377) |  | (255) |  | 12,715 |
Investment in other infrastructure projects | 632 |  | 18 |  | — |  | — |  | — |  | 650 |
Depreciation/amortization of other infrastructure projects | — |  | (34) |  | — |  | — |  | — |  | (34) |
Total net investment in other infrastructure projects | 632 |  | (16) |  | — |  | — |  | — |  | 616 |
TOTAL INVESTMENT | 14,285 |  | 695 |  | (1) |  | (393) |  | (387) |  | 14,199 |
TOTAL DEPRECIATION/AMORTIZATION AND PROVISION | (781) |  | (235) |  | — |  | 17 |  | 132 |  | (867) |
TOTAL NET INVESTMENT | 13,504 |  | 460 |  | (1) |  | (376) |  | (255) |  | 13,333 |
Disclosure of financial assets from financial asset model concessions [Table Text Block] |
(Million euro) | INFRASTRUCTURE PROJECT RECEIVABLES 2024 | INFRASTRUCTURE PROJECT RECEIVABLES 2023
OPENING BALANCE | 162 |  | 163 |
Additions | 6 |  | 9 |
Disposals | (14) |  | (12) |
Foreign exchange effect | 3 |  | 2 |
YEAR-END BALANCE | 158 |  | 162 |
Note: Balances net of provisions
Disclosure of financial assets from financial asset by concession operator [Table Text Block] |
| BALANCES AT 12/31/2024
CONCESSION OPERATOR (Million euro) | LONG-TERM RECEIVABLES | SHORT-TERM RECEIVABLES | TOTAL
Concesionaria de Prisiones Lledoners | 49 |  | 3 |  | 52 |
Depusa Aragón | 21 |  | 1 |  | 22 |
Budimex Parking Wrocław | 11 |  | — |  | 11 |
CONSTRUCTION | 81 |  | 4 |  | 85 |
UK Waste Treatment (Thalia) | 77 |  | — |  | 77 |
UK WASTE TREATMENT | 77 |  | — |  | 77 |
GROUP TOTAL | 158 |  | 4 |  | 162 |
| BALANCES AT 12/31/2023
CONCESSION OPERATOR (Million euro) | LONG-TERM RECEIVABLES | SHORT-TERM RECEIVABLES | TOTAL
Concesionaria de Prisiones Lledoners | 52 |  | 3 |  | 55 |
Depusa Aragón | 22 |  | 1 |  | 23 |
Budimex Parking Wrocław | 11 |  | — |  | 11 |
CONSTRUCTION | 85 |  | 4 |  | 89 |
UK Waste Treatment (Thalia) | 77 |  | — |  | 77 |
UK WASTE TREATMENT | 77 |  | — |  | 77 |
GROUP TOTAL | 162 |  | 4 |  | 166 |

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