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Corporate income tax and deferred taxes credits - Narrative (Details)
£ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
EUR (€)
Dec. 31, 2024
CAD ($)
Dec. 31, 2023
EUR (€)
Dec. 31, 2022
EUR (€)
Dec. 31, 2024
GBP (£)
Dec. 31, 2024
EUR (€)
Dec. 31, 2023
GBP (£)
Dec. 31, 2023
EUR (€)
Dec. 31, 2021
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Tax expense (income) € 145,000,000   € 115,000,000 € 30,000,000          
Deferred tax assets           € 1,159,000,000   € 1,006,000,000  
Deferred tax liabilities           1,239,000,000   1,086,000,000  
Additional positive impact due to the resolution of the ruling related to Royal Decree-Law 3/2016 (RDL 3/2016) for years after 2023           0.70      
Adjustments to reconcile profit (loss) € (1,897,000,000)   650,000,000 695,000,000          
Tax rate 15.00% 15.00%              
Tax rate effect from change in tax rate 15.00% 15.00%              
Tax rate effect of foreign tax rates 15.00% 15.00%              
Notional amount           6,438,000,000   4,990,000  
Provisions         £ 22 € 1,311,000,000 £ 40 1,279,000,000  
Deferred tax expense (income) € (28,000,000)   65,000,000 42,000,000          
Grupo Serveo, S.L.                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Cost of sales 0.2478                
IRB infrastructure developers limited [Member]                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Percentage of the adquisition         5.00% 5.00%     24.86%
Cost of sales € 215,000,000                
FGP Topco limited [Member]                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Percentage of the sale of the FGP Topco 19.75% 19.75%              
FGP Topco limited [Member] | Financial investment carried at fair value [Member]                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Percentage of the sale of the FGP Topco 19.75% 19.75%              
IRB infrastructure developers limited [Member]                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Proceeds from sale or issue of treasury shares € 16,000,000                
Investment property completed           € 0.05      
Construction division [Member]                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Tax expense (income) 142,000,000   65,000,000 6,000,000          
Toll roads division [Member]                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Tax expense (income) 110,000,000   55,000,000 39,000,000          
Tax losses carry forward [Member]                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Implied the recognition of future net operating losses 23,000,000                
Maximum tax credit           17,000,000      
SPAIN | Tax losses carry forward [Member]                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Implied the recognition of future net operating losses 12,000,000                
Maximum tax credit           10,000,000      
Increase decrease in deferred tax assets (22,000,000)                
CANADA                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Estimates the pending regularization 2,200,000 $ 3.3              
CANADA | IRB infrastructure developers limited [Member]                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Proceeds from sale or issue of treasury shares 16,000,000                
UNITED STATES                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Provisions           8,000,000   26,000,000  
UNITED STATES | Tax losses carry forward [Member]                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Provisions           8,000,000      
NETHERLANDS                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Tax credits recognized in an amount equal to the excess liability for temporary differences over the asset for temporary differences USA           10,000,000      
Turkey, New Lira | Tax losses carry forward [Member]                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Increase decrease in deferred tax assets 31,000,000                
POLAND                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Adjustments for effect of different tax rates of subsidiaries operating in other jurisdictions 13,000,000                
POLAND | Construction division [Member]                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Provisions           (17,000,000)      
Total not used by group companies [Member]                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Notional amount           537,000,000      
Other tax credits [Member]                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Notional amount           20,000,000      
Deferred taxes assets [Member]                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Deferred tax assets       784,000,000   1,159,000,000   1,006,000,000  
Relate mostly to deferred tax assets arising from financial derivatives, 198,000,000   48,000,000            
Deferred taxes assets [Member] | Tax credits [Member]                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Deferred tax assets       370,000,000   537,000,000   503,000,000  
Deferred taxes assets [Member] | Differences between tax and accounting [Member]                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Deferred tax assets       274,000,000   377,000,000   422,000,000  
Deferred taxes assets [Member] | Differences between tax and accounting [Member] | Provisions that do not have tax effects until they are applied [Member]                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Deferred tax assets           198,000,000   195,000,000  
Deferred taxes assets [Member] | Differences between tax and accounting [Member] | Revenue recognition [Member]                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Deferred tax assets           238,000,000      
Deferred taxes assets [Member] | Differences between tax and accounting [Member] | Revenue recognition [Member] | Construction division [Member]                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Deferred tax assets               216,000,000  
Deferred taxes assets [Member] | Differences between tax and accounting [Member] | Accelerated book depreciation amortization [Member] | Construction division [Member]                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Deferred tax assets           16,000,000   7,000,000  
Deferred taxes assets [Member] | Equity measurement adjustment [Member]                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Deferred tax assets       86,000,000   197,000,000   48,000,000  
Deferred taxes assets [Member] | Other items [Member]                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Deferred tax assets       55,000,000   48,000,000   33,000,000  
Deferred taxes liabilities [Member]                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Deferred tax liabilities       924,000,000   1,239,000,000   1,086,000,000  
Deferred taxes liabilities [Member] | Differences between tax and accounting [Member]                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Deferred tax assets           322,000,000   242,000,000  
Deferred tax liabilities       378,000,000   548,000,000   561,000,000  
Deferred taxes liabilities [Member] | Differences between tax and accounting [Member] | Toll roads division [Member]                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Deferred tax assets           234,000,000   201,000,000  
Deferred taxes liabilities [Member] | Equity measurement adjustment [Member]                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Deferred tax liabilities       64,000,000   234,000,000   69,000,000  
Deferred taxes liabilities [Member] | Equity measurement adjustment [Member] | Deferred taxes arising from equity [Member]                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Deferred tax liabilities           234,000,000   69,000,000  
Deferred taxes liabilities [Member] | Other items [Member]                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Deferred tax liabilities       145,000,000   134,000,000   126,000,000  
Deferred taxes liabilities [Member] | Deferred taxes on goodwill [Member]                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Deferred tax assets           18,000,000   21,000,000  
Deferred tax liabilities       21,000,000   22,000,000   22,000,000  
Deferred taxes liabilities [Member] | Deferred fair value adjustment [Member]                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Deferred tax liabilities       € 315,000,000   301,000,000   308,000,000  
Deferred taxes liabilities [Member] | Deferred fair value adjustment [Member] | Dalaman international airport [Member]                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Deferred tax assets           € 31,000,000   51,000,000  
Percentage of the adquisition         60.00% 60.00%      
Deferred taxes liabilities [Member] | Deferred fair value adjustment [Member] | Toll roads division [Member] | I66 Express mobility partners hold LLC [Member] | For the difference between tax and book values following the revaluation of the I66 highway asset [Member]                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Deferred tax assets           € 270,000,000   257,000,000  
Profit (loss) recognised on exchanging construction services for financial asset € 36,000,000   35,000,000            
Deferred taxes liabilities [Member] | CANADA | Other items [Member] | Deferred taxes arising from equity [Member]                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Deferred tax liabilities           11,000,000   € 72,000,000  
Prior year tax [Member]                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Additional positive impact due to the resolution of the ruling related to Royal Decree-Law 3/2016 (RDL 3/2016) for years after 2023           € 31,000,000      
Main adjustments for theoretical income tax in USA [Member] | UNITED STATES                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Adjustments for current tax of prior periods     (9,000,000)            
Main adjustments for theoretical income tax in Netherlands [Member] | NETHERLANDS                  
Detail of information about corporate income tax and deferred taxes [Line Items]                  
Adjustments for current tax of prior periods     € (7,000,000)