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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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Detailed information about non controlling interests

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The profit (loss) from continuing and discontinued operations attributable to non-controlling interests. [Refer: Profit (loss); Non-controlling interests]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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