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Accounting Policies Property Plan And Equipment - Narrative (Details) - EUR (€)
 1 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Detail of information about summary of significant accounting policies [Line Items]        
Percentage of ownership interest previously   50.00%    
Consolidated groups assets contributed by joint operations   € 1,057,000,000 € 1,173,000,000 € 428,000,000
Consolidated groups profit loss contributed by joint operations   157,000,000 36,000,000 40,000,000
Consolidated groups revenue contributed by joint operations   1,581,000,000 1,401,000,000 1,242,000,000
Revenue € 9,147,000,000 9,147,000,000 8,514,000,000 7,551,000,000
Net depreciation charges related to provisions for replacements under IFRIC12   37,000,000 24,000,000  
Impact on the classification of one of the financial debts   84,000,000    
Profit attributable to the companys holdings in the concession operators and not eliminated on consolidation   (14,206,000) (34,942,000) (60,507,000)
Recognition of a capital gain   € 19,000,000    
Percentage holding the majority of voting rights   49.00%    
Percentage of economic rights and majority of voting rights   100.00%    
IFRIC 12 [Member]        
Detail of information about summary of significant accounting policies [Line Items]        
Borrowing costs associated with the financing of concessions to which the financial asset model     (7,000,000) (9,000,000)
Financial income from services provided by the concession operators that apply the financial asset model [Member]        
Detail of information about summary of significant accounting policies [Line Items]        
Revenue   € 9,000,000 10,000,000 10,000,000
Financial income from services provided by the concession operators that apply the financial asset model [Member] | IFRIC 12 [Member]        
Detail of information about summary of significant accounting policies [Line Items]        
Revenue   9,000,000 10,000,000 10,000,000
Borrowing costs associated with the financing of concessions to which the financial asset model   € (6,000,000)    
IRB Infrastructure Trust (Private InvIT) [Member]        
Detail of information about summary of significant accounting policies [Line Items]        
Proportion of ownership interest in associate   23.99%    
Total stake retain by Ferrovial for associates   34.10%    
FGP Topco limited [Member]        
Detail of information about summary of significant accounting policies [Line Items]        
Proportion of ownership interest in associate   19.75%    
Percentage of the ferrovials stake in the asset   5.25%    
Percentage of the sale of the FGP Topco   19.75%    
Total stake retain by Ferrovial for associates   25.00%    
FGP Topco limited [Member] | December [Member]        
Detail of information about summary of significant accounting policies [Line Items]        
Percentage of the ferrovials stake in the asset   19.75%    
407 International Inc [Member]        
Detail of information about summary of significant accounting policies [Line Items]        
Proportion of ownership interest in associate   43.23%    
JFKNTO sponsor aggregator LLC [Member]        
Detail of information about summary of significant accounting policies [Line Items]        
Proportion of ownership interest in associate   49.00%    
Toll roads division [Member]        
Detail of information about summary of significant accounting policies [Line Items]        
Revenue € 1,256,000,000 € 1,256,000,000 € 1,085,000,000 € 780,000,000
Recognition of a capital gain   € 19,000,000    
Percentage holding the majority of voting rights   51.00%    
Toll roads division [Member] | Cintra OSARS [Member]        
Detail of information about summary of significant accounting policies [Line Items]        
Proportion of ownership interest in associate   50.00%    
Toll roads division [Member] | Cintra Slovakia Ltd [Member]        
Detail of information about summary of significant accounting policies [Line Items]        
Proportion of ownership interest in associate   35.00%    
Toll roads division [Member] | Cintra Toowoomba Ltd [Member]        
Detail of information about summary of significant accounting policies [Line Items]        
Proportion of ownership interest in associate   40.00%    
Toll roads division [Member] | IRB Infrastructure Trust (Private InvIT) [Member]        
Detail of information about summary of significant accounting policies [Line Items]        
Percentage adquired by Ferrovial subsidiary of the buyers capital   23.99%    
Toll roads division [Member] | 407 International Inc [Member]        
Detail of information about summary of significant accounting policies [Line Items]        
Proportion of ownership interest in associate   43.23%    
Toll roads division [Member] | JFKNTO sponsor aggregator LLC [Member]        
Detail of information about summary of significant accounting policies [Line Items]        
Proportion of ownership interest in associate   49.00%