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Equity Shareholders Own Interest (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Non controlling interest item [Line Items] |  |  |
Assets | € 28,999 | € 26,318 |
Liabilities | 20,879 | 20,439 |
Profit (loss), attributable to owners of parent | 3,239 | 341 | € 188
Autop terrassa manresa SA [Member] |  |  |
Non controlling interest item [Line Items] |  |  |
Assets | 573 | 590 |
Liabilities | 138 | 196 |
Shareholder funds | 436 | 394 |
Net cash position | 8 | 18 |
Profit (loss), attributable to owners of parent | 25 | 27 |
LBJ infrastructure group [Member] |  |  |
Non controlling interest item [Line Items] |  |  |
Assets | 2,197 | 2,084 |
Liabilities | 2,462 | 2,296 |
Shareholder funds | (265) | (212) |
Net cash position | (1,959) | (1,828) |
Profit (loss), attributable to owners of parent | 33 | 24 |
NTE mobility partners [Member] |  |  |
Non controlling interest item [Line Items] |  |  |
Assets | 2,128 | 1,967 |
Liabilities | 2,117 | 1,954 |
Shareholder funds | 11 | 13 |
Net cash position | (1,285) | (1,144) |
Profit (loss), attributable to owners of parent | 101 | 102 |
NTE mobility partners segments LLC [Member] |  |  |
Non controlling interest item [Line Items] |  |  |
Assets | 2,129 | 2,019 |
Liabilities | 1,857 | 1,735 |
Shareholder funds | 272 | 284 |
Net cash position | (1,581) | (1,471) |
Profit (loss), attributable to owners of parent | 70 | 48 |
I77 mobility partners [Member] |  |  |
Non controlling interest item [Line Items] |  |  |
Assets | 708 | 775 |
Liabilities | 688 | 509 |
Shareholder funds | 20 | 266 |
Net cash position | (450) | (183) |
Profit (loss), attributable to owners of parent | 23 | 31 |
I66 mobility partners [Member] |  |  |
Non controlling interest item [Line Items] |  |  |
Assets | 6,276 | 6,108 |
Liabilities | 2,676 | 2,567 |
Shareholder funds | 3,600 | 3,542 |
Net cash position | (1,672) | (1,469) |
Profit (loss), attributable to owners of parent | (4) | (20) |
Budimex S.A [Member] |  |  |
Non controlling interest item [Line Items] |  |  |
Assets | 1,907 | 2,029 |
Liabilities | 1,565 | 1,616 |
Shareholder funds | 342 | 413 |
Net cash position | 726 | 874 |
Profit (loss), attributable to owners of parent | 74 | 80 |
Dalaman international airport [Member] |  |  |
Non controlling interest item [Line Items] |  |  |
Assets | 717 | 710 |
Liabilities | 428 | 478 |
Shareholder funds | 289 | 232 |
Net cash position | (61) | (86) |
Profit (loss), attributable to owners of parent | € 35 | € (10) |

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