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Cash and cash equivalents and borrowings About borrowings (Details) - EUR (€) € in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | € 11,288 | € 11,378
Infrastructure project [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Bonds issued | 5,199 | 4,442
Bank borrowings | 3,200 | 3,473
Borrowings | 8,400 | 7,915
Increase decrease in bonds issued | 757 |
Increase decrease in bank borrowings | (272) |
Increase decrease in borrowings | 485 |
Infrastructure project [Member] | Toll roads division [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 7,945 | 7,410
Infrastructure project [Member] | US toll roads [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 7,338 | 6,749
Infrastructure project [Member] | Spanish toll roads [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 587 | 628
Infrastructure project [Member] | Other concessions [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 19 | 33
Infrastructure project [Member] | Airports division [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 94 | 104
Infrastructure project [Member] | Construction division [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 103 | 106
Infrastructure project [Member] | Energy and mobility infrastructures division [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 211 | 246
Infrastructure project [Member] | Other division [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 47 | 49
Infrastructure project [Member] | Long-term borrowings [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Bonds issued | 5,198 | 4,441
Bank borrowings | 3,058 | 3,412
Borrowings | 8,256 | 7,852
Increase decrease in bonds issued | 758 |
Increase decrease in bank borrowings | (354) |
Increase decrease in borrowings | 404 |
Infrastructure project [Member] | Long-term borrowings [member] | Toll roads division [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Bonds issued | 5,198 | 4,441
Bank borrowings | 2,707 | 2,937
Borrowings | 7,905 | 7,378
Increase decrease in bonds issued | 758 |
Increase decrease in bank borrowings | (230) |
Increase decrease in borrowings | 528 |
Infrastructure project [Member] | Long-term borrowings [member] | US toll roads [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Bonds issued | 5,198 | 4,441
Bank borrowings | 2,138 | 2,307
Borrowings | 7,337 | 6,748
Increase decrease in bonds issued | 758 |
Increase decrease in bank borrowings | (169) |
Increase decrease in borrowings | 589 |
Infrastructure project [Member] | Long-term borrowings [member] | Spanish toll roads [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Bonds issued | 0 | 0
Bank borrowings | 564 | 611
Borrowings | 564 | 611
Increase decrease in bonds issued | 0 |
Increase decrease in bank borrowings | (47) |
Increase decrease in borrowings | (47) |
Infrastructure project [Member] | Long-term borrowings [member] | Other concessions [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Bonds issued | 0 | 0
Bank borrowings | 5 | 19
Borrowings | 5 | 19
Increase decrease in bonds issued | 0 |
Increase decrease in bank borrowings | (14) |
Increase decrease in borrowings | (14) |
Infrastructure project [Member] | Long-term borrowings [member] | Airports division [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Bonds issued | 0 | 0
Bank borrowings | 0 | 89
Borrowings | 0 | 89
Increase decrease in bonds issued | 0 |
Increase decrease in bank borrowings | (89) |
Increase decrease in borrowings | (89) |
Infrastructure project [Member] | Long-term borrowings [member] | Construction division [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Bonds issued | 0 | 0
Bank borrowings | 97 | 102
Borrowings | 97 | 102
Increase decrease in bonds issued | 0 |
Increase decrease in bank borrowings | (4) |
Increase decrease in borrowings | (4) |
Infrastructure project [Member] | Long-term borrowings [member] | Energy and mobility infrastructures division [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Bonds issued | 0 | 0
Bank borrowings | 209 | 236
Borrowings | 209 | 236
Increase decrease in bonds issued | 0 |
Increase decrease in bank borrowings | (26) |
Increase decrease in borrowings | (26) |
Infrastructure project [Member] | Long-term borrowings [member] | Other division [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Bonds issued | 0 | 0
Bank borrowings | 44 | 48
Borrowings | 44 | 48
Increase decrease in bonds issued | 0 |
Increase decrease in bank borrowings | (4) |
Increase decrease in borrowings | (4) |
Infrastructure project [Member] | Short-term borrowings [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Bonds issued | 1 | 1
Bank borrowings | 142 | 62
Borrowings | 143 | 63
Increase decrease in bonds issued | 0 |
Increase decrease in bank borrowings | 81 |
Increase decrease in borrowings | 81 |
Infrastructure project [Member] | Short-term borrowings [member] | Toll roads division [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Bonds issued | 1 | 1
Bank borrowings | 38 | 31
Borrowings | 39 | 33
Increase decrease in bonds issued | 0 |
Increase decrease in bank borrowings | 7 |
Increase decrease in borrowings | 7 |
Infrastructure project [Member] | Short-term borrowings [member] | US toll roads [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Bonds issued | 1 | 1
Bank borrowings | 0 | 0
Borrowings | 1 | 1
Increase decrease in bonds issued | 0 |
Increase decrease in bank borrowings | 0 |
Increase decrease in borrowings | 0 |
Infrastructure project [Member] | Short-term borrowings [member] | Spanish toll roads [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Bonds issued | 0 | 0
Bank borrowings | 24 | 17
Borrowings | 24 | 17
Increase decrease in bonds issued | 0 |
Increase decrease in bank borrowings | 6 |
Increase decrease in borrowings | 6 |
Infrastructure project [Member] | Short-term borrowings [member] | Other concessions [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Bonds issued | 0 | 0
Bank borrowings | 14 | 14
Borrowings | 14 | 14
Increase decrease in bonds issued | 0 |
Increase decrease in bank borrowings | 1 |
Increase decrease in borrowings | 1 |
Infrastructure project [Member] | Short-term borrowings [member] | Airports division [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Bonds issued | 0 | 0
Bank borrowings | 94 | 15
Borrowings | 94 | 15
Increase decrease in bonds issued | 0 |
Increase decrease in bank borrowings | 80 |
Increase decrease in borrowings | 80 |
Infrastructure project [Member] | Short-term borrowings [member] | Construction division [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Bonds issued | 0 | 0
Bank borrowings | 5 | 5
Borrowings | 5 | 5
Increase decrease in bonds issued | 0 |
Increase decrease in bank borrowings | 1 |
Increase decrease in borrowings | 1 |
Infrastructure project [Member] | Short-term borrowings [member] | Energy and mobility infrastructures division [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Bonds issued | 0 | 0
Bank borrowings | 2 | 11
Borrowings | 2 | 11
Increase decrease in bonds issued | 0 |
Increase decrease in bank borrowings | (9) |
Increase decrease in borrowings | (9) |
Infrastructure project [Member] | Short-term borrowings [member] | Other division [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Bonds issued | 0 | 0
Bank borrowings | 3 | 3
Borrowings | 3 | € 3
Increase decrease in bonds issued | 0 |
Increase decrease in bank borrowings | 0 |
Increase decrease in borrowings | € 0 |

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