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Cash and cash equivalents and borrowings exInfrastructure project borrowings (Details) - Infrastructure project [Member] - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Other infrastructure projects company borrowings [Line Items] |  |
Borrowings other infrastructure project company | € 474 | € 538
Increase decrease in borrowings other infrastructure project company |  | (64)
Transchile charrúa transmisión sa [Member] |  |
Other infrastructure projects company borrowings [Line Items] |  |
Borrowings other infrastructure project company | 105 | 99
Increase decrease in borrowings other infrastructure project company | 5 |
Centella transmisión S.A. [Member] |  |
Other infrastructure projects company borrowings [Line Items] |  |
Borrowings other infrastructure project company | 106 | 125
Increase decrease in borrowings other infrastructure project company | (18) |
Concesionaria de prisiones lledoners [Member] |  |
Other infrastructure projects company borrowings [Line Items] |  |
Borrowings other infrastructure project company | 63 | 65
Increase decrease in borrowings other infrastructure project company | (2) |
Depusa aragon [Member] |  |
Other infrastructure projects company borrowings [Line Items] |  |
Borrowings other infrastructure project company | 24 | 25
Increase decrease in borrowings other infrastructure project company | (2) |
Autovía de aragón SA [Member] |  |
Other infrastructure projects company borrowings [Line Items] |  |
Borrowings other infrastructure project company | 19 | 33
Increase decrease in borrowings other infrastructure project company | (14) |
Budimex group [Member] |  |
Other infrastructure projects company borrowings [Line Items] |  |
Borrowings other infrastructure project company | 16 | 16
Increase decrease in borrowings other infrastructure project company | 0 |
Parque solar castilla [Member] |  |
Other infrastructure projects company borrowings [Line Items] |  |
Borrowings other infrastructure project company | 0 | 23
Increase decrease in borrowings other infrastructure project company | (22) |
Dalaman international airport [Member] |  |
Other infrastructure projects company borrowings [Line Items] |  |
Borrowings other infrastructure project company | 94 | 104
Increase decrease in borrowings other infrastructure project company | (10) |
UK waste treatment thalia [Member] |  |
Other infrastructure projects company borrowings [Line Items] |  |
Borrowings other infrastructure project company | 47 | 49
Increase decrease in borrowings other infrastructure project company | (2) |
Long-term borrowings [member] |  |
Other infrastructure projects company borrowings [Line Items] |  |
Borrowings other infrastructure project company | 356 | 494
Long-term borrowings [member] | Transchile charrúa transmisión sa [Member] |  |
Other infrastructure projects company borrowings [Line Items] |  |
Borrowings other infrastructure project company | 105 | 91
Long-term borrowings [member] | Centella transmisión S.A. [Member] |  |
Other infrastructure projects company borrowings [Line Items] |  |
Borrowings other infrastructure project company | 105 | 125
Long-term borrowings [member] | Concesionaria de prisiones lledoners [Member] |  |
Other infrastructure projects company borrowings [Line Items] |  |
Borrowings other infrastructure project company | 61 | 63
Long-term borrowings [member] | Depusa aragon [Member] |  |
Other infrastructure projects company borrowings [Line Items] |  |
Borrowings other infrastructure project company | 22 | 24
Long-term borrowings [member] | Autovía de aragón SA [Member] |  |
Other infrastructure projects company borrowings [Line Items] |  |
Borrowings other infrastructure project company | 5 | 19
Long-term borrowings [member] | Budimex group [Member] |  |
Other infrastructure projects company borrowings [Line Items] |  |
Borrowings other infrastructure project company | 15 | 15
Long-term borrowings [member] | Parque solar castilla [Member] |  |
Other infrastructure projects company borrowings [Line Items] |  |
Borrowings other infrastructure project company | 0 | 20
Long-term borrowings [member] | Dalaman international airport [Member] |  |
Other infrastructure projects company borrowings [Line Items] |  |
Borrowings other infrastructure project company | 0 | 89
Long-term borrowings [member] | UK waste treatment thalia [Member] |  |
Other infrastructure projects company borrowings [Line Items] |  |
Borrowings other infrastructure project company | 44 | 48
Short-term borrowings [member] |  |
Other infrastructure projects company borrowings [Line Items] |  |
Borrowings other infrastructure project company | 119 | 44
Short-term borrowings [member] | Transchile charrúa transmisión sa [Member] |  |
Other infrastructure projects company borrowings [Line Items] |  |
Borrowings other infrastructure project company | 0 | 8
Short-term borrowings [member] | Centella transmisión S.A. [Member] |  |
Other infrastructure projects company borrowings [Line Items] |  |
Borrowings other infrastructure project company | 2 | 0
Short-term borrowings [member] | Concesionaria de prisiones lledoners [Member] |  |
Other infrastructure projects company borrowings [Line Items] |  |
Borrowings other infrastructure project company | 3 | 2
Short-term borrowings [member] | Depusa aragon [Member] |  |
Other infrastructure projects company borrowings [Line Items] |  |
Borrowings other infrastructure project company | 2 | 1
Short-term borrowings [member] | Autovía de aragón SA [Member] |  |
Other infrastructure projects company borrowings [Line Items] |  |
Borrowings other infrastructure project company | 14 | 14
Short-term borrowings [member] | Budimex group [Member] |  |
Other infrastructure projects company borrowings [Line Items] |  |
Borrowings other infrastructure project company | 1 | 1
Short-term borrowings [member] | Parque solar castilla [Member] |  |
Other infrastructure projects company borrowings [Line Items] |  |
Borrowings other infrastructure project company | 0 | 3
Short-term borrowings [member] | Dalaman international airport [Member] |  |
Other infrastructure projects company borrowings [Line Items] |  |
Borrowings other infrastructure project company | 94 | 15
Short-term borrowings [member] | UK waste treatment thalia [Member] |  |
Other infrastructure projects company borrowings [Line Items] |  |
Borrowings other infrastructure project company | € 3 | € 1

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