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Investments in infrastructure projects from financial asset model concessions operator (Details) - EUR (€) € in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Investments in infrastructure projects receivables [Line Items] |  |  |
Infrastructure project receivables | € 162 | € 166 |
Long term infrastructure project receivables [Member] |  |  |
Investments in infrastructure projects receivables [Line Items] |  |  |
Infrastructure project receivables | 158 | 162 | € 163
Short term infrastructure projects receivables [Member] |  |  |
Investments in infrastructure projects receivables [Line Items] |  |  |
Infrastructure project receivables | 4 | 4 |
Construction division [Member] |  |  |
Investments in infrastructure projects receivables [Line Items] |  |  |
Infrastructure project receivables | 85 | 89 |
Construction division [Member] | Long term infrastructure project receivables [Member] |  |  |
Investments in infrastructure projects receivables [Line Items] |  |  |
Infrastructure project receivables | 81 | 85 |
Construction division [Member] | Short term infrastructure projects receivables [Member] |  |  |
Investments in infrastructure projects receivables [Line Items] |  |  |
Infrastructure project receivables | 4 | 4 |
UK waste treatment [Member] |  |  |
Investments in infrastructure projects receivables [Line Items] |  |  |
Infrastructure project receivables | 77 | 77 |
UK waste treatment [Member] | Long term infrastructure project receivables [Member] |  |  |
Investments in infrastructure projects receivables [Line Items] |  |  |
Infrastructure project receivables | 77 | 77 |
UK waste treatment [Member] | Short term infrastructure projects receivables [Member] |  |  |
Investments in infrastructure projects receivables [Line Items] |  |  |
Infrastructure project receivables | 0 | 0 |
Concesionaria de prisiones lledoners [Member] | Construction division [Member] |  |  |
Investments in infrastructure projects receivables [Line Items] |  |  |
Infrastructure project receivables | 52 | 55 |
Concesionaria de prisiones lledoners [Member] | Construction division [Member] | Long term infrastructure project receivables [Member] |  |  |
Investments in infrastructure projects receivables [Line Items] |  |  |
Infrastructure project receivables | 49 | 52 |
Concesionaria de prisiones lledoners [Member] | Construction division [Member] | Short term infrastructure projects receivables [Member] |  |  |
Investments in infrastructure projects receivables [Line Items] |  |  |
Infrastructure project receivables | 3 | 3 |
Depusa aragon [Member] | Construction division [Member] |  |  |
Investments in infrastructure projects receivables [Line Items] |  |  |
Infrastructure project receivables | 22 | 23 |
Depusa aragon [Member] | Construction division [Member] | Long term infrastructure project receivables [Member] |  |  |
Investments in infrastructure projects receivables [Line Items] |  |  |
Infrastructure project receivables | 21 | 22 |
Depusa aragon [Member] | Construction division [Member] | Short term infrastructure projects receivables [Member] |  |  |
Investments in infrastructure projects receivables [Line Items] |  |  |
Infrastructure project receivables | 1 | 1 |
Budimex parking wrocław [Member] | Construction division [Member] |  |  |
Investments in infrastructure projects receivables [Line Items] |  |  |
Infrastructure project receivables | 11 | 11 |
Budimex parking wrocław [Member] | Construction division [Member] | Long term infrastructure project receivables [Member] |  |  |
Investments in infrastructure projects receivables [Line Items] |  |  |
Infrastructure project receivables | 11 | 11 |
Budimex parking wrocław [Member] | Construction division [Member] | Short term infrastructure projects receivables [Member] |  |  |
Investments in infrastructure projects receivables [Line Items] |  |  |
Infrastructure project receivables | 0 | 0 |
UK waste treatment thalia [Member] | UK waste treatment [Member] |  |  |
Investments in infrastructure projects receivables [Line Items] |  |  |
Infrastructure project receivables | 77 | 77 |
UK waste treatment thalia [Member] | UK waste treatment [Member] | Long term infrastructure project receivables [Member] |  |  |
Investments in infrastructure projects receivables [Line Items] |  |  |
Infrastructure project receivables | 77 | 77 |
UK waste treatment thalia [Member] | UK waste treatment [Member] | Short term infrastructure projects receivables [Member] |  |  |
Investments in infrastructure projects receivables [Line Items] |  |  |
Infrastructure project receivables | € 0 | € 0 |

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