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Investments in infrastructure projects of intangible asset model (Details) - EUR (€) € in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2024 | Jan. 01, 2024 | Jan. 01, 2023
Intangible asset model [Line Items] |  |  |  |  |
Investments in infrastructure projects intangible asset model | € 13,989 | € 13,333 | € 13,989 | € 13,333 | € 13,504
Increase decrease in investments in infrastructure projects intangible asset model additions | (154) | 460 |  |  |
Increase decrease in investments in infrastructure projects intangible asset mode disposals |  | (1) |  |  |
Increase decrease in investments in infrastructure projects intangible asset mode exchange rate | 812 | (376) |  |  |
Accumulated depreciation amortization [Member] |  |  |  |  |
Intangible asset model [Line Items] |  |  |  |  |
Investments in infrastructure projects intangible asset model |  | (834) | (1,089) | (834) | (781)
Increase decrease in investments in infrastructure projects intangible asset model additions | (209) | (201) |  |  |
Increase decrease in investments in infrastructure projects intangible asset mode disposals |  | 0 |  |  |
Increase decrease in investments in infrastructure projects intangible asset mode exchange rate | (46) | 16 |  |  |
Increase decrease in investments in infrastructure projects intangible asset mode consolidation scope changes and transfers |  | 132 |  |  |
Net investment in toll roads [Member] |  |  |  |  |
Intangible asset model [Line Items] |  |  |  |  |
Investments in infrastructure projects intangible asset model |  | 12,715 | 13,396 | 12,715 | 12,872
Increase decrease in investments in infrastructure projects intangible asset model additions | (130) | 476 |  |  |
Increase decrease in investments in infrastructure projects intangible asset mode disposals |  | (1) |  |  |
Increase decrease in investments in infrastructure projects intangible asset mode exchange rate | 812 | (377) |  |  |
Increase decrease in investments in infrastructure projects intangible asset mode consolidation scope changes and transfers |  | (255) |  |  |
Investment in other infrastructure projects [Member] |  |  |  |  |
Intangible asset model [Line Items] |  |  |  |  |
Investments in infrastructure projects intangible asset model |  | 650 | 650 | 650 | 632
Increase decrease in investments in infrastructure projects intangible asset model additions | 0 | 18 |  |  |
Increase decrease in investments in infrastructure projects intangible asset mode disposals |  | 0 |  |  |
Increase decrease in investments in infrastructure projects intangible asset mode exchange rate | 0 | 0 |  |  |
Increase decrease in investments in infrastructure projects intangible asset mode consolidation scope changes and transfers |  | 0 |  |  |
Depreciation amortization in other infrastructure projects [Member] |  |  |  |  |
Intangible asset model [Line Items] |  |  |  |  |
Investments in infrastructure projects intangible asset model |  | (34) | (58) | (34) | 0
Increase decrease in investments in infrastructure projects intangible asset model additions | (24) | (34) |  |  |
Increase decrease in investments in infrastructure projects intangible asset mode disposals |  | 0 |  |  |
Increase decrease in investments in infrastructure projects intangible asset mode exchange rate | 0 | 0 |  |  |
Increase decrease in investments in infrastructure projects intangible asset mode consolidation scope changes and transfers |  | 0 |  |  |
Total net investment in other infrastructure projects [Member] |  |  |  |  |
Intangible asset model [Line Items] |  |  |  |  |
Investments in infrastructure projects intangible asset model |  | 616 | 592 | 616 | 632
Increase decrease in investments in infrastructure projects intangible asset model additions | (24) | (16) |  |  |
Increase decrease in investments in infrastructure projects intangible asset mode disposals |  | 0 |  |  |
Increase decrease in investments in infrastructure projects intangible asset mode exchange rate | 0 | 0 |  |  |
Increase decrease in investments in infrastructure projects intangible asset mode consolidation scope changes and transfers |  | 0 |  |  |
Total investment [Member] |  |  |  |  |
Intangible asset model [Line Items] |  |  |  |  |
Investments in infrastructure projects intangible asset model |  | 14,199 | 15,135 | 14,199 | 14,285
Increase decrease in investments in infrastructure projects intangible asset model additions | 79 | 695 |  |  |
Increase decrease in investments in infrastructure projects intangible asset mode disposals |  | (1) |  |  |
Increase decrease in investments in infrastructure projects intangible asset mode exchange rate | 858 | (393) |  |  |
Increase decrease in investments in infrastructure projects intangible asset mode consolidation scope changes and transfers |  | (387) |  |  |
Total depreciation amortization and provision [Member] |  |  |  |  |
Intangible asset model [Line Items] |  |  |  |  |
Investments in infrastructure projects intangible asset model |  | (867) | (1,146) | (867) | (781)
Increase decrease in investments in infrastructure projects intangible asset model additions | (233) | (235) |  |  |
Increase decrease in investments in infrastructure projects intangible asset mode disposals |  | 0 |  |  |
Increase decrease in investments in infrastructure projects intangible asset mode exchange rate | (46) | 17 |  |  |
Increase decrease in investments in infrastructure projects intangible asset mode consolidation scope changes and transfers |  | 132 |  |  |
Spanish toll roads [Member] |  |  |  |  |
Intangible asset model [Line Items] |  |  |  |  |
Investments in infrastructure projects intangible asset model |  | 721 | 724 | 721 | 714
Increase decrease in investments in infrastructure projects intangible asset model additions | 3 | 7 |  |  |
Increase decrease in investments in infrastructure projects intangible asset mode disposals |  | 0 |  |  |
Increase decrease in investments in infrastructure projects intangible asset mode exchange rate | 0 | 0 |  |  |
Increase decrease in investments in infrastructure projects intangible asset mode consolidation scope changes and transfers |  | 0 |  |  |
US toll roads [Member] |  |  |  |  |
Intangible asset model [Line Items] |  |  |  |  |
Investments in infrastructure projects intangible asset model |  | 12,823 | 13,757 | 12,823 | 12,547
Increase decrease in investments in infrastructure projects intangible asset model additions | 76 | 670 |  |  |
Increase decrease in investments in infrastructure projects intangible asset mode disposals |  | (1) |  |  |
Increase decrease in investments in infrastructure projects intangible asset mode exchange rate | 858 | (393) |  |  |
Increase decrease in investments in infrastructure projects intangible asset mode consolidation scope changes and transfers |  | 0 |  |  |
Other toll roads [Member] |  |  |  |  |
Intangible asset model [Line Items] |  |  |  |  |
Investments in infrastructure projects intangible asset model |  | 4 | 4 | 4 | 391
Increase decrease in investments in infrastructure projects intangible asset model additions | 0 | 0 |  |  |
Increase decrease in investments in infrastructure projects intangible asset mode disposals |  | 0 |  |  |
Increase decrease in investments in infrastructure projects intangible asset mode exchange rate | 0 | 0 |  |  |
Increase decrease in investments in infrastructure projects intangible asset mode consolidation scope changes and transfers |  | (387) |  |  |
Toll road investment [Member] |  |  |  |  |
Intangible asset model [Line Items] |  |  |  |  |
Investments in infrastructure projects intangible asset model |  | 13,549 | € 14,485 | € 13,549 | € 13,653
Increase decrease in investments in infrastructure projects intangible asset model additions | 79 | 677 |  |  |
Increase decrease in investments in infrastructure projects intangible asset mode disposals |  | (1) |  |  |
Increase decrease in investments in infrastructure projects intangible asset mode exchange rate | € 858 | (393) |  |  |
Increase decrease in investments in infrastructure projects intangible asset mode consolidation scope changes and transfers |  | € (387) |  |  |

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