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Profit/(loss) from non-controlling interests (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Detailed information about non controlling interests [Line Items] |  |  |
Profit (loss), attributable to non-controlling interests | € (251) | € (170) | € (117)
Percentage entitities with noncontrolling interests | 0.00% |  |
Budimex group [Member] |  |  |
Detailed information about non controlling interests [Line Items] |  |  |
Profit (loss), attributable to non-controlling interests | € (77) | (83) | (60)
Percentage entitities with noncontrolling interests | 49.86% |  |
Autop terrassa manresa SA [Member] |  |  |
Detailed information about non controlling interests [Line Items] |  |  |
Profit (loss), attributable to non-controlling interests | € (8) | (8) | 19
Percentage entitities with noncontrolling interests | 23.72% |  |
LBJ infrastructure group [Member] |  |  |
Detailed information about non controlling interests [Line Items] |  |  |
Profit (loss), attributable to non-controlling interests | € (28) | (20) | (9)
Percentage entitities with noncontrolling interests | 45.40% |  |
NTE mobility partners [Member] |  |  |
Detailed information about non controlling interests [Line Items] |  |  |
Profit (loss), attributable to non-controlling interests | € (59) | (60) | (47)
Percentage entitities with noncontrolling interests | 37.03% |  |
NTE mobility partners segments 3 LLC |  |  |
Detailed information about non controlling interests [Line Items] |  |  |
Profit (loss), attributable to non-controlling interests | € (60) | (41) | (33)
Percentage entitities with noncontrolling interests | 46.33% |  |
FAM construction LLC [Member] |  |  |
Detailed information about non controlling interests [Line Items] |  |  |
Profit (loss), attributable to non-controlling interests | € 9 | 34 | 26
Percentage entitities with noncontrolling interests | 30.00% |  |
D4R7 construction S.R.O. [Member] |  |  |
Detailed information about non controlling interests [Line Items] |  |  |
Profit (loss), attributable to non-controlling interests | € 3 | (1) | 2
Percentage entitities with noncontrolling interests | 35.00% |  |
I77 mobility partners [Member] |  |  |
Detailed information about non controlling interests [Line Items] |  |  |
Profit (loss), attributable to non-controlling interests | € (9) | (12) | (6)
Percentage entitities with noncontrolling interests | 27.77% |  |
I66 mobility partners [Member] |  |  |
Detailed information about non controlling interests [Line Items] |  |  |
Profit (loss), attributable to non-controlling interests | € 3 | 16 | 10
Percentage entitities with noncontrolling interests | 44.30% |  |
Dalaman international airport [Member] |  |  |
Detailed information about non controlling interests [Line Items] |  |  |
Profit (loss), attributable to non-controlling interests | € (24) | 7 | (8)
Percentage entitities with noncontrolling interests | 40.00% |  |
Webber united LLC |  |  |
Detailed information about non controlling interests [Line Items] |  |  |
Profit (loss), attributable to non-controlling interests | € 0 | 1 | 0
Percentage entitities with noncontrolling interests | 40.00% |  |
Other companies [Member] |  |  |
Detailed information about non controlling interests [Line Items] |  |  |
Profit (loss), attributable to non-controlling interests | € (2) | € (3) | € (11)
Percentage entitities with noncontrolling interests | 0.00% |  |

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