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Appendix I. Subsidiaries (fully-consolidated companies) (million euro) (Details) - EUR (€)
 1 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of subsidiaries [line items]        
Investments in associates accounted for using equity method € 3,023,000,000 € 3,023,000,000 € 2,038,000,000 € 1,951,000,000
Assets   28,999,000,000 26,318,000,000  
Liabilities   20,879,000,000 20,439,000,000  
Revenue 9,147,000,000 9,147,000,000 8,514,000,000 7,551,000,000
Profit (loss)   € 3,490,000,000 511,000,000 305,000,000
IRB infrastructure developers limited [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in associate   19.86%    
Investments in associates accounted for using equity method 315,000,000   376,000,000 377,000,000
407 International Inc [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in associate   43.23%    
Investments in associates accounted for using equity method 778,000,000   928,000,000 1,063,000,000
JFKNTO sponsor aggregator LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in associate   49.00%    
Investments in associates accounted for using equity method 1,006,000,000   471,000,000 235,000,000
Corporation division [Member]        
Disclosure of subsidiaries [line items]        
Revenue 520,000,000   506,000,000 466,000,000
Construction division [Member]        
Disclosure of subsidiaries [line items]        
Revenue 7,234,000,000 € 7,234,000,000 6,869,000,000 6,280,000,000
Profit (loss)   258,000,000 98,000,000 65,000,000
Toll roads division [Member]        
Disclosure of subsidiaries [line items]        
Revenue 1,256,000,000 1,256,000,000 1,085,000,000 780,000,000
Profit (loss)   € 663,000,000 548,000,000 157,000,000
Toll roads division [Member] | 407 International Inc [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in associate   43.23%    
Toll roads division [Member] | JFKNTO sponsor aggregator LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in associate   49.00%    
Airports division [Member]        
Disclosure of subsidiaries [line items]        
Revenue 91,000,000   80,000,000 54,000,000
Energy and mobility infrastructures division [Member]        
Disclosure of subsidiaries [line items]        
Revenue € 270,000,000   207,000,000 191,000,000
SPAIN        
Disclosure of subsidiaries [line items]        
Revenue   € 1,582,000,000 1,475,000,000 1,154,000,000
SPAIN | Corporation division [Member] | Ferrovial Inversiones, S.A. (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 2,000,000    
SPAIN | Corporation division [Member] | Ferrovial Emisiones, S.A. (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
SPAIN | Corporation division [Member] | Ferrovial Corporación, S.A. (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 5,000,000    
SPAIN | Corporation division [Member] | I Ferrofin, S.L. (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   52.00%    
Net cost ownership   € 40,000,000    
SPAIN | Corporation division [Member] | II Ferrofin, S.L. (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   48.00%    
Net cost ownership   € 33,000,000    
SPAIN | Corporation division [Member] | Temauri, S.L. (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 5,000,000    
SPAIN | Corporation division [Member] | Ferrovial 011, S.A.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
SPAIN | Corporation division [Member] | Ferrovial 012, S.A.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
SPAIN | Corporation division [Member] | Ferrovial 013, S.A.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
SPAIN | Corporation division [Member] | Ferrovial 014, S.A.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
SPAIN | Corporation division [Member] | Ferrovial Venture VI, S.A.U. (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 6,000,000    
SPAIN | Corporation division [Member] | Ferrovial Ventures, S.A.U. (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 15,000,000    
SPAIN | Corporation division [Member] | Ferrovial 009, S.L.U (a)        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
SPAIN | Corporation division [Member] | Ferrovial 015, S.L.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
SPAIN | Corporation division [Member] | Ferrovial 016, S.L.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
SPAIN | Corporation division [Member] | Ferrovial 017, S.L.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
SPAIN | Corporation division [Member] | Ferrovial 008, S.L.U (a)        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
SPAIN | Construction division [Member] | Via olmedo pedralba sa [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in associate   7.20%    
Investments in associates accounted for using equity method   € 1,000,000    
Assets   5,000,000    
Liabilities   2,000,000    
Revenue   5,000,000    
Profit (loss)   € 0    
SPAIN | Construction division [Member] | Boremer S.A. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in associate   50.00%    
Investments in associates accounted for using equity method   € 1,000,000    
Assets   2,000,000    
Liabilities   1,000,000    
Revenue   0    
Profit (loss)   € 0    
SPAIN | Construction division [Member] | Conc. Prisiones Lledoners,S.A. (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 16,000,000    
SPAIN | Construction division [Member] | Cadagua, S.A. (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   99.95%    
Net cost ownership   € 70,000,000    
SPAIN | Construction division [Member] | Cocsa, S.A. (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   99.95%    
Net cost ownership   € 8,000,000    
SPAIN | Construction division [Member] | Ditecpesa, S.A. (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   99.95%    
Net cost ownership   € 1,000,000    
SPAIN | Construction division [Member] | Ferroconservación, S.A. (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   99.00%    
Net cost ownership   € 19,000,000    
SPAIN | Construction division [Member] | Ferrovial Construcción, S.A. (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   99.99%    
Net cost ownership   € 386,000,000    
SPAIN | Construction division [Member] | Ferrovial Medio Ambiente y Energía, S.A. (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   99.95%    
Net cost ownership   € 1,000,000    
SPAIN | Construction division [Member] | Ferrovial Railway S.A. (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   98.80%    
Net cost ownership   € 0    
SPAIN | Construction division [Member] | Urbaoeste, S.A. (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   99.00%    
Net cost ownership   € 0    
SPAIN | Construction division [Member] | Cimentaciones Especiales y Estructurales CIMSA, S.A.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   99.00%    
Net cost ownership   € 0    
SPAIN | Construction division [Member] | Arena Recursos Naturales, S.A.U. (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
SPAIN | Construction division [Member] | I Depusa Aragón S.A. (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   51.70%    
Net cost ownership   € 2,000,000    
SPAIN | Construction division [Member] | II Depusa Aragón S.A. (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   42.30%    
Net cost ownership   € 0    
SPAIN | Construction division [Member] | Tecpresa Structural Solutions, S.A. (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   99.10%    
Net cost ownership   € 2,000,000    
SPAIN | Toll roads division [Member] | Bip & drive sa [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in associate   25.00%    
Investments in associates accounted for using equity method   € 6,000,000    
Assets   38,000,000    
Liabilities   13,000,000    
Revenue   18,000,000    
Profit (loss)   € 4,000,000    
SPAIN | Toll roads division [Member] | Empresa de mantenimiento y explotación m30 sa [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in associate   50.00%    
Investments in associates accounted for using equity method   € (34,000,000)    
Assets   238,000,000    
Liabilities   238,000,000    
Revenue   37,000,000    
Profit (loss)   € 10,000,000    
SPAIN | Toll roads division [Member] | Madrid calle 30 S.A. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in associate   20.00%    
Investments in associates accounted for using equity method   € 56,000,000    
Assets   730,000,000    
Liabilities   169,000,000    
Revenue   158,000,000    
Profit (loss)   € 68,000,000    
SPAIN | Toll roads division [Member] | Cintra Infraestructuras Spain, S.L. (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 101,000,000    
SPAIN | Toll roads division [Member] | Cintra Inversora Autopistas de Cataluña, S.L. (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
SPAIN | Toll roads division [Member] | Inversora Autopistas de Cataluña, S.L. (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
SPAIN | Toll roads division [Member] | Cintra Inversiones, S.L.U. (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
SPAIN | Toll roads division [Member] | Cintra Servicios de Infraestructuras, S.A. (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   99.99%    
Net cost ownership   € 0    
SPAIN | Toll roads division [Member] | Autopista Alcalá-O'Donnell, S.A. (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 3,000,000    
SPAIN | Toll roads division [Member] | Autovía de Aragón, Sociedad Concesionaria, S.A. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   55.00%    
Net cost ownership   € 23,000,000    
SPAIN | Toll roads division [Member] | Pilum sa [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   94.10%    
Net cost ownership   € 0    
SPAIN | Toll roads division [Member] | Ferrovial Aravia, S.A. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   55.00%    
Net cost ownership   € 1,000,000    
SPAIN | Toll roads division [Member] | Autema, S.A. (a)        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   76.30%    
Net cost ownership   € 426,000,000    
SPAIN | Toll roads division [Member] | II Autovía de Aragón, Sociedad Concesionaria, S.A.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   30.00%    
Net cost ownership   € 15,000,000    
SPAIN | Toll roads division [Member] | III Autovía de Aragón, Sociedad Concesionaria, S.A.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   15.00%    
Net cost ownership   € 3,000,000    
SPAIN | Toll roads division [Member] | II Ferrovial Aravia, S.A.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   30.00%    
Net cost ownership   € 1,000,000    
SPAIN | Toll roads division [Member] | III Ferrovial Aravia, S.A.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   15.00%    
Net cost ownership   € 0    
SPAIN | Toll roads division [Member] | Azalia, Sp.z.o.o.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 8,000,000    
SPAIN | Airports division [Member] | Ferrovial Aeropuertos España, S.A. (a)        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 28,000,000    
SPAIN | Energy and mobility infrastructures division [Member] | Siemsa Control y Sistemas S.A.U. (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 1,000,000    
SPAIN | Energy and mobility infrastructures division [Member] | Ferrovial Infraestructuras Energéticas, S.A.U. (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 21,000,000    
SPAIN | Energy and mobility infrastructures division [Member] | Parque Solar Casilla, S.L.U. (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 9,000,000    
SPAIN | Energy and mobility infrastructures division [Member] | Ferrovial Mobility, S.L. (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 15,000,000    
SPAIN | Energy and mobility infrastructures division [Member] | Cea Infraestructuras Energéticas (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
SPAIN | Energy and mobility infrastructures division [Member] | Jucar Infraestructuras Energéticas (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
SPAIN | Energy and mobility infrastructures division [Member] | Pisuerga Infraestructuras Energéticas, S.A.U. (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
SPAIN | Energy and mobility infrastructures division [Member] | Ferrovial Growth VI, S.L. (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 10,000,000    
SPAIN | Energy and mobility infrastructures division [Member] | Roland Servicios Empresariales, S.L.U.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 15,000,000    
SPAIN | Energy and mobility infrastructures division [Member] | Ferrovial 004, S.A. (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 17,000,000    
SPAIN | Energy and mobility infrastructures division [Member] | Ferrovial Transco España , S.A.U. (a)        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 14,000,000    
SPAIN | Energy and mobility infrastructures division [Member] | Ferrovial Energía S.A. (a)        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 16,000,000    
UNITED KINGDOM        
Disclosure of subsidiaries [line items]        
Revenue   € 809,000,000 771,000,000 708,000,000
UNITED KINGDOM | Corporation division [Member] | Ferrocorp UK Ltd. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 1,000,000    
UNITED KINGDOM | Corporation division [Member] | Ferrovial Ventures, Ltd. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 7,000,000    
UNITED KINGDOM | Construction division [Member] | Ferrovial Construction (UK) Limited [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 9,000,000    
UNITED KINGDOM | Construction division [Member] | Ferrovial Construction Holdings Limited [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 74,000,000    
UNITED KINGDOM | Construction division [Member] | FC Civil Solutions Limited [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
UNITED KINGDOM | Toll roads division [Member] | Sociedad Concesionaria Anillo Vial, S.A.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in associate   35.00%    
Investments in associates accounted for using equity method   € 14,000,000    
Assets   0    
Liabilities   0    
Revenue   0    
Profit (loss)   € 0    
UNITED KINGDOM | Toll roads division [Member] | Zero by pass holdings ltd [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in associate   35.00%    
Investments in associates accounted for using equity method   € 0    
Assets   0    
Liabilities   0    
Revenue   0    
Profit (loss)   € 0    
UNITED KINGDOM | Toll roads division [Member] | Zero bypass Ltd [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in associate   100.00%    
Investments in associates accounted for using equity method   € 13,000,000    
Assets   944,000,000    
Liabilities   908,000,000    
Revenue   36,000,000    
Profit (loss)   € 3,000,000    
UNITED KINGDOM | Toll roads division [Member] | River linx holdings ltd [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in associate   22.50%    
Investments in associates accounted for using equity method   € 0    
Assets   0    
Liabilities   0    
Revenue   0    
Profit (loss)   € 0    
UNITED KINGDOM | Toll roads division [Member] | RiverLinx Ltd [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in associate   100.00%    
Investments in associates accounted for using equity method   € 65,000,000    
Assets   1,820,000,000    
Liabilities   1,528,000,000    
Revenue   204,000,000    
Profit (loss)   € 7,000,000    
UNITED KINGDOM | Toll roads division [Member] | Cintra Silvertown Ltd [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 1,000,000    
UNITED KINGDOM | Toll roads division [Member] | Cintra Infrastructures UK Ltd [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 42,000,000    
UNITED KINGDOM | Toll roads division [Member] | Cintra Toowoomba Ltd [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
UNITED KINGDOM | Toll roads division [Member] | Cintra Slovakia Ltd [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 1,000,000    
UNITED KINGDOM | Toll roads division [Member] | Cintra OSARS Western Ltd [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 23,000,000    
UNITED KINGDOM | Airports division [Member] | Faero UK Holding Limited [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 255,000,000    
UNITED KINGDOM | Airports division [Member] | Ferrovial Airports International, S.E [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 1,372,000,000    
UNITED KINGDOM | Energy and mobility infrastructures division [Member] | Ferrovial Services Netherlands B.V. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 26,000,000    
UNITED KINGDOM | Energy and mobility infrastructures division [Member] | Thalia Waste Treatment B.V.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 1,000,000    
UNITED KINGDOM | Energy and mobility infrastructures division [Member] | Ferrovial Energy US, LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 13,000,000    
UNITED KINGDOM | Energy and mobility infrastructures division [Member] | Ferrovial Energy US 1, LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
UNITED KINGDOM | Energy and mobility infrastructures division [Member] | Thalia Waste Management Limited [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   50.00%    
Net cost ownership   € 0    
UNITED KINGDOM | Energy and mobility infrastructures division [Member] | Thalia MK ODC Limited [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
UNITED KINGDOM | Energy and mobility infrastructures division [Member] | Thalia AWRP ODC Limited [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
UNITED KINGDOM | Energy and mobility infrastructures division [Member] | Thalia WB HoldCo Limited [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
UNITED KINGDOM | Energy and mobility infrastructures division [Member] | Thalia WB ODC Limited [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
UNITED KINGDOM | Energy and mobility infrastructures division [Member] | Thalia WB Services Limited [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
UNITED KINGDOM | Energy and mobility infrastructures division [Member] | Thalia WB SPV Limited [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
UNITED KINGDOM | Energy and mobility infrastructures division [Member] | Thalia IOW SPV Limited [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
UNITED KINGDOM | Energy and mobility infrastructures division [Member] | Thalia Services Limited        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
UNITED KINGDOM | Energy and mobility infrastructures division [Member] | Thalia MK HoldCo Limited [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
UNITED KINGDOM | Energy and mobility infrastructures division [Member] | Thalia MK SPV Limited [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
UNITED KINGDOM | Energy and mobility infrastructures division [Member] | Thalia Ventures Limited [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
UNITED KINGDOM | Energy and mobility infrastructures division [Member] | Thalia IOW ODC Ltd [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
UNITED KINGDOM | Energy and mobility infrastructures division [Member] | Thalia Holdco Ltd [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
UNITED KINGDOM | Energy and mobility infrastructures division [Member] | Alto Huemul Transmisión SPA        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
UNITED KINGDOM | Energy and mobility infrastructures division [Member] | Alto Huemul II SPA        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
UNITED KINGDOM | Energy and mobility infrastructures division [Member] | Misae Solar IV        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 66,000,000    
UNITED STATES        
Disclosure of subsidiaries [line items]        
Revenue   € 3,271,000,000 2,879,000,000 2,906,000,000
UNITED STATES | Corporation division [Member] | Landmille US LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
UNITED STATES | Corporation division [Member] | Ferrovial IT US, LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
UNITED STATES | Construction division [Member] | ConnectedWorks, LLC        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in associate   40.00%    
Investments in associates accounted for using equity method   € 0    
Assets   0    
Liabilities   0    
Revenue   0    
Profit (loss)   € 0    
UNITED STATES | Construction division [Member] | Pepper lawson horizonIntl group [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in associate   70.00%    
Investments in associates accounted for using equity method   € 0    
Assets   0    
Liabilities   0    
Revenue   1,000,000    
Profit (loss)   € 0    
UNITED STATES | Construction division [Member] | Ferrovial Construction East, LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 457,000,000    
UNITED STATES | Construction division [Member] | Cadagua US LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 14,000,000    
UNITED STATES | Construction division [Member] | Ferrovial Agroman 56, LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 35,000,000    
UNITED STATES | Construction division [Member] | Ferrovial Agroman Indiana, LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
UNITED STATES | Construction division [Member] | Ferrovial Construction Texas, LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 74,000,000    
UNITED STATES | Construction division [Member] | Ferrovial Construction US Corp. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 1,010,000,000    
UNITED STATES | Construction division [Member] | Ferrovial Construction US Holding Corp. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 1,168,000,000    
UNITED STATES | Construction division [Member] | I Grand Parkway Infrastructure LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   30.00%    
Net cost ownership   € 0    
UNITED STATES | Construction division [Member] | II Grand Parkway Infrastructure LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   40.00%    
Net cost ownership   € 0    
UNITED STATES | Construction division [Member] | Ferrovial Energy Solutions, LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
UNITED STATES | Construction division [Member] | Webber Infrastructure Management US Inc.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 308,000,000    
UNITED STATES | Construction division [Member] | Webber Infrastructure Management Inc.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 39,000,000    
UNITED STATES | Construction division [Member] | Ferrovial Construccion JFK T1 LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
UNITED STATES | Construction division [Member] | Sugar Creek Construction LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   70.00%    
Net cost ownership   € 64,000,000    
UNITED STATES | Construction division [Member] | I Trinity Infrastructure LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   40.00%    
Net cost ownership   € 0    
UNITED STATES | Construction division [Member] | II Trinity Infrastructure LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   60.00%    
Net cost ownership   € 0    
UNITED STATES | Construction division [Member] | North Tarrant Infrastructures [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   25.00%    
Net cost ownership   € 0    
UNITED STATES | Construction division [Member] | II North Tarrant Infrastructures [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   75.00%    
Net cost ownership   € 0    
UNITED STATES | Construction division [Member] | California Rail Builders [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   80.00%    
Net cost ownership   € 0    
UNITED STATES | Construction division [Member] | Ferrovial Construction West, LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
UNITED STATES | Construction division [Member] | I Bluebonnet Constractor, LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   40.00%    
Net cost ownership   € 0    
UNITED STATES | Construction division [Member] | II Bluebonnet Contractor, LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   60.00%    
Net cost ownership   € 0    
UNITED STATES | Construction division [Member] | DBW Construction LLC. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € (2,000,000)    
UNITED STATES | Construction division [Member] | I PLW Waterworks LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   50.00%    
Net cost ownership   € 0    
UNITED STATES | Construction division [Member] | II PLW Waterworks LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   50.00%    
Net cost ownership   € 0    
UNITED STATES | Construction division [Member] | Webber Materials, LLC        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 88,000,000    
UNITED STATES | Construction division [Member] | W.W. Webber, LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 653,000,000    
UNITED STATES | Construction division [Member] | Webber Barrier Services [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 5,000,000    
UNITED STATES | Construction division [Member] | Webber Commercial Construction LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
UNITED STATES | Construction division [Member] | Webber Equipment & Materials LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 227,000,000    
UNITED STATES | Construction division [Member] | Webber Management Group LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 41,000,000    
UNITED STATES | Construction division [Member] | FAM Construction LLC (I-66) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   70.00%    
Net cost ownership   € 337,000,000    
UNITED STATES | Construction division [Member] | Webber Infrastructure Management Holding US Corp        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € (3,000,000)    
UNITED STATES | Construction division [Member] | Tecpresa Structural Solutions, LLC        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
UNITED STATES | Construction division [Member] | North Perimeter Contractors LLC        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 387,000,000    
UNITED STATES | Construction division [Member] | Webber united LLC        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   60.00%    
Net cost ownership   € 0    
UNITED STATES | Toll roads division [Member] | Cintra ITR LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   49.00%    
Net cost ownership   € 78,000,000    
UNITED STATES | Toll roads division [Member] | Cintra Holding US Corp [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 22,000,000    
UNITED STATES | Toll roads division [Member] | Cintra Texas Corp [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € (22,000,000)    
UNITED STATES | Toll roads division [Member] | Cintra US Services LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 1,000,000    
UNITED STATES | Toll roads division [Member] | Cintra LBJ LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 303,000,000    
UNITED STATES | Toll roads division [Member] | Cintra NTE LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 240,000,000    
UNITED STATES | Toll roads division [Member] | Cintra NTE Mobility Partners Segments 3 LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 4,000,000    
UNITED STATES | Toll roads division [Member] | Cintra Toll Services LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
UNITED STATES | Toll roads division [Member] | Cintra I-77 Mobility Partners LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 142,000,000    
UNITED STATES | Toll roads division [Member] | Cintra 2 I-77 Mobility Partners LLC (2) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 66,000,000    
UNITED STATES | Toll roads division [Member] | Cintra 2 I-66 Express Mobility Partners [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 679,000,000    
UNITED STATES | Toll roads division [Member] | I-66 Express Mobility Partners LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 1,437,000,000    
UNITED STATES | Toll roads division [Member] | Cintra 3I-66 Express Mobility Partners LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 200,000,000    
UNITED STATES | Toll roads division [Member] | Cintra 3 I-77 Mobility Partners LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 104,000,000    
UNITED STATES | Toll roads division [Member] | Cintra Digital Business Ventures LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
UNITED STATES | Toll roads division [Member] | Cintra North Corridor Transit Partners, LLC        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
UNITED STATES | Toll roads division [Member] | I-77 Mobility Partners Holding LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   50.10%    
Net cost ownership   € 108,000,000    
UNITED STATES | Toll roads division [Member] | II I-77 Mobility Partners Holding LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   15.00%    
Net cost ownership   € 68,000,000    
UNITED STATES | Toll roads division [Member] | I-77 Mobility Partners LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 218,000,000    
UNITED STATES | Toll roads division [Member] | LBJ Infrastructure Group Holding LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   54.60%    
Net cost ownership   € 0    
UNITED STATES | Toll roads division [Member] | LBJ Infrastructure Group LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 521,000,000    
UNITED STATES | Toll roads division [Member] | NTE mobilitypartners holding [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   63.00%    
Net cost ownership   € 240,000,000    
UNITED STATES | Toll roads division [Member] | NTE mobility partners [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 322,000,000    
UNITED STATES | Toll roads division [Member] | NTE mobility partners segments 3 holding LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   53.70%    
Net cost ownership   € 276,000,000    
UNITED STATES | Toll roads division [Member] | NTE mobility partners segments 3 LLC        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 436,000,000    
UNITED STATES | Toll roads division [Member] | I-66 Express Mobility Partners Holdings LLC        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   50.00%    
Net cost ownership   € 0    
UNITED STATES | Toll roads division [Member] | II Cintra ITR LLC        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   44.00%    
Net cost ownership   € 23,000,000    
UNITED STATES | Airports division [Member] | JFKNTO sponsor aggregator LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in associate   51.00%    
Investments in associates accounted for using equity method   € 1,006,000,000    
Assets   10,436,000,000    
Liabilities   8,547,000,000    
Revenue   68,000,000    
Profit (loss)   € 7,000,000    
UNITED STATES | Airports division [Member] | Ferrovial Airports Holding US Corp [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 799,000,000    
UNITED STATES | Airports division [Member] | Ferrovial Airports O&M Services LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
UNITED STATES | Airports division [Member] | Ferrovial Airports US Terminal One LLC. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 734,000,000    
UNITED STATES | Airports division [Member] | MARS NTO LLC. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   96.10%    
Net cost ownership   € 742,000,000    
UNITED STATES | Airports division [Member] | Ferrovial Airports CHS MSA LLC        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
UNITED STATES | Energy and mobility infrastructures division [Member] | Ferrovial Mobility U.S., LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 1,000,000    
SAUDI ARABIA | Construction division [Member] | Ferrovial Agroman Company [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   97.50%    
Net cost ownership   € 3,000,000    
AUSTRALIA | Construction division [Member] | Ferrovial Construction (Australia) PTY LTD [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 46,000,000    
AUSTRALIA | Toll roads division [Member] | Nexus infrastructure holdings unit trust [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in associate   40.00%    
Investments in associates accounted for using equity method   € 3,000,000    
Assets   18,000,000    
Liabilities   0    
Revenue   0    
Profit (loss)   € 0    
AUSTRALIA | Toll roads division [Member] | Nexus infr unit trust toowoomba [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in associate   100.00%    
Investments in associates accounted for using equity method   € 10,000,000    
Assets   37,000,000    
Liabilities   16,000,000    
Revenue   37,000,000    
Profit (loss)   € 3,000,000    
AUSTRALIA | Toll roads division [Member] | Nexus infrastructure holdings pty ltd [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in associate   40.00%    
Investments in associates accounted for using equity method   € 0    
Assets   0    
Liabilities   0    
Revenue   0    
Profit (loss)   € 0    
AUSTRALIA | Toll roads division [Member] | Nexus Infrastructure PTY Ltd        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in associate   100.00%    
Investments in associates accounted for using equity method   € 0    
Assets   0    
Liabilities   0    
Revenue   0    
Profit (loss)   € 0    
AUSTRALIA | Toll roads division [Member] | Netflow osars western gp [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in associate   50.00%    
Investments in associates accounted for using equity method   € 38,000,000    
Assets   151,000,000    
Liabilities   74,000,000    
Revenue   25,000,000    
Profit (loss)   € 3,000,000    
AUSTRALIA | Toll roads division [Member] | Cintra OSARS (Western) Holdings Unit Trust [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 23,000,000    
AUSTRALIA | Toll roads division [Member] | Cintra OSARS Western Unit Trust [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € (3,000,000)    
AUSTRALIA | Toll roads division [Member] | Cintra Developments Australia PTY, Ltd [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 1,000,000    
AUSTRALIA | Toll roads division [Member] | Cintra OSARS (Western) Holdings PTY Ltd [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
AUSTRALIA | Toll roads division [Member] | Cintra OSARS Western PTY Ltd [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
BRAZIL | Construction division [Member] | Constructora Ferrovial Ltd. (Brasil) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   99.00%    
Net cost ownership   € 1,000,000    
CANADA        
Disclosure of subsidiaries [line items]        
Revenue   € 246,000,000 161,000,000 100,000,000
CANADA | Construction division [Member] | Ontario transit groupInc [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in associate   50.00%    
Investments in associates accounted for using equity method   € 0    
Assets   1,046,000,000    
Liabilities   1,078,000,000    
Revenue   409,000,000    
Profit (loss)   € 0    
CANADA | Construction division [Member] | Ferrovial Construction Canada Inc. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 66,000,000    
CANADA | Construction division [Member] | Webber infrastructure management canada holdings ltd [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
CANADA | Construction division [Member] | Webber Infrastructure Management Alberta Ltd        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
CANADA | Construction division [Member] | Webber Infrastructure Management Canada Ltd        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 6,000,000    
CANADA | Construction division [Member] | Webber Infrastructure Management Ontario Limited        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 30,000,000    
CANADA | Construction division [Member] | Ontario Transit FCCI (Hold Co) Inc.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
CANADA | Toll roads division [Member] | 407 International Inc [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in associate   43.20%    
Investments in associates accounted for using equity method   € 778,000,000    
Assets   3,866,000,000    
Liabilities   8,029,000,000    
Revenue   1,151,000,000    
Profit (loss)   € 467,000,000    
CANADA | Toll roads division [Member] | Cintra 4352238 Investments INC        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
CHILE | Construction division [Member] | Constructora Ferrovial Ltda. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   97.20%    
Net cost ownership   € 0    
CHILE | Construction division [Member] | Ferrovial Construcción Chile S.A. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 63,000,000    
CHILE | Construction division [Member] | Ferrovial Empresa Constructora Ltda [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
CHILE | Construction division [Member] | Siemsa Chile S.P.A [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
CHILE | Toll roads division [Member] | Cintra Infraestructuras Chile SpA [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
CHILE | Toll roads division [Member] | Cintra Infraestructuras Perú, S.A.C        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   99.90%    
Net cost ownership   € 0    
CHILE | Toll roads division [Member] | Ferrovial MAD 01, S.A.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 91,000,000    
CHILE | Energy and mobility infrastructures division [Member] | BXF Energía SP. z.o.o.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   51.00%    
Net cost ownership   € 7,000,000    
CHILE | Energy and mobility infrastructures division [Member] | Ferrovial Power Infrastructure Chile, SpA [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 65,000,000    
CHILE | Energy and mobility infrastructures division [Member] | Ferrovial Transco Chile II SpA [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
CHILE | Energy and mobility infrastructures division [Member] | Transchile charrúa transmisión sa [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   99.90%    
Net cost ownership   € 0    
CHILE | Energy and mobility infrastructures division [Member] | Ferrovial Transco Chile III SPA [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
CHILE | Energy and mobility infrastructures division [Member] | Ferrovial Transco Chile IV SpA [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
CHILE | Energy and mobility infrastructures division [Member] | Centella transmisión S.A. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   99.99%    
Net cost ownership   € 50,000,000    
CHILE | Energy and mobility infrastructures division [Member] | II Centella Transmisión, S.A [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   50.10%    
Net cost ownership   € 0    
CHILE | Energy and mobility infrastructures division [Member] | Berliam S.p.A. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   65.10%    
Net cost ownership   € 0    
CHILE | Energy and mobility infrastructures division [Member] | II Berliam S.p.A. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   34.90%    
Net cost ownership   € 0    
CHILE | Energy and mobility infrastructures division [Member] | Steel Ingenieria, S.A. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   99.99%    
Net cost ownership   € 31,000,000    
CHILE | Energy and mobility infrastructures division [Member] | Veltis, Sp.a        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
CHILE | Energy and mobility infrastructures division [Member] | Walvis, S.A.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   99.70%    
Net cost ownership   € 0    
CHILE | Energy and mobility infrastructures division [Member] | Inversiones (Chile) Holdings Limitada [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   99.99%    
Net cost ownership   € 3,000,000    
CHILE | Energy and mobility infrastructures division [Member] | Inversiones (Chile) Limitada [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   99.99%    
Net cost ownership   € 0    
CHILE | Energy and mobility infrastructures division [Member] | III Centella Transmisión , S.A.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   49.90%    
Net cost ownership   € 0    
CHILE | Energy and mobility infrastructures division [Member] | Ferrovial Energy PTY LTD        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
CHILE | Energy and mobility infrastructures division [Member] | II BXF Energía Sp. z.o.o.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   49.00%    
Net cost ownership   € 7,000,000    
CHILE | Energy and mobility infrastructures division [Member] | Veltis Servicios, SpA        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
COLOMBIA | Construction division [Member] | Ferrovial Construcción Colombia, S.A.S [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
COLOMBIA | Toll roads division [Member] | Concesionaria ruta del cacao sas [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in associate   30.00%    
Investments in associates accounted for using equity method   € 27,000,000    
Assets   736,000,000    
Liabilities   644,000,000    
Revenue   139,000,000    
Profit (loss)   € 22,000,000    
COLOMBIA | Toll roads division [Member] | Cintra Infraestructuras Colombia, S.A.S. (a) [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 23,000,000    
SLOVAKIA | Construction division [Member] | D4R7 construction S.R.O. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   65.00%    
Net cost ownership   € 0    
SLOVAKIA | Construction division [Member] | Ferrovial Construction Slovakia S.R.O [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   99.00%    
Net cost ownership   € (2,000,000)    
SLOVAKIA | Construction division [Member] | Budimex slovakias .r.o [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
FRANCE | Construction division [Member] | Ferrovial Construction France, S.A [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 12,000,000    
MEXICO | Construction division [Member] | I Cadagua Ferr. Industrial México [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   75.10%    
Net cost ownership   € 0    
MEXICO | Construction division [Member] | II Cadagua Ferr. Industrial México [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   24.90%    
Net cost ownership   € 0    
NEW ZEALAND | Construction division [Member] | Ferrovial Construction (New Zeeland) Limited [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 2,000,000    
PERU | Construction division [Member] | Ferrovial Construcción Perú, S.A.C. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   99.99%    
Net cost ownership   € 0    
POLAND        
Disclosure of subsidiaries [line items]        
Revenue   € 2,119,000,000 € 2,160,000,000 € 1,842,000,000
POLAND | Construction division [Member] | Pphu promos spzoo [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in associate   26.30%    
Investments in associates accounted for using equity method   € 1,000,000    
Assets   3,000,000    
Liabilities   1,000,000    
Revenue   3,000,000    
Profit (loss)   € 0    
POLAND | Construction division [Member] | Ferrovial Holding US Corp [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 3,102,000,000    
POLAND | Construction division [Member] | Mostostal Kraków S.A. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 3,000,000    
POLAND | Construction division [Member] | FBSerwis Kamieńsk Sp. z o.o. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   80.00%    
Net cost ownership   € 0    
POLAND | Construction division [Member] | FBSerwis Wrocław Sp. z o.o. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
POLAND | Construction division [Member] | FBSerwis Dolny Sląsk Sp. z o.o. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
POLAND | Construction division [Member] | FBSerwis Karpatia Sp. z o.o. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
POLAND | Construction division [Member] | Budimex S.A [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   50.10%    
Net cost ownership   € 83,000,000    
POLAND | Construction division [Member] | FB Serwis S.A. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 69,000,000    
POLAND | Construction division [Member] | JZE Sp. z o.o. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
POLAND | Construction division [Member] | Zaklad, Przetworstwa Odpadow Zawisty Sp. z.o.o.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
POLAND | Construction division [Member] | PPHUH Konstralex Sp. z.o.o.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
POLAND | Construction division [Member] | IIIII green waste management 1 spz.o.o [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership      
POLAND | Construction division [Member] | Green Waste Management 6 sp.z.o.o.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership      
POLAND | Construction division [Member] | Mostostal Kraków Energetyka sp. z o.o.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
POLAND | Construction division [Member] | Budimex Budownictwo Sp. z o.o.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
POLAND | Construction division [Member] | Budimex Kolejnictwo SA        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 26,000,000    
POLAND | Construction division [Member] | Budimex Parking Wrocław Sp. z o.o.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   51.00%    
Net cost ownership   € 1,000,000    
POLAND | Construction division [Member] | Fotowoltaika HIG XIV Sp. z o.o.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 2,000,000    
POLAND | Construction division [Member] | FBSerwis Zielony Kamieńsk Sp. z o.o.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
POLAND | Construction division [Member] | Cintra Development BV        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
POLAND | Construction division [Member] | Cintra INVIT Investments B.V.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 718,000,000    
POLAND | Construction division [Member] | Cintra IM Investments B.V.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
POLAND | Construction division [Member] | Budimex SA Tecnicas Reunidas SA - Turów s.c.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   50.00%    
Net cost ownership   € 0    
POLAND | Construction division [Member] | Budimex SA Cadagua SA V sc        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   99.90%    
Net cost ownership   € 0    
POLAND | Construction division [Member] | Budimex SA Cadagua SA IV sc        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   99.90%    
Net cost ownership   € 0    
POLAND | Construction division [Member] | Budimex SA Sygnity SA sj        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   67.00%    
Net cost ownership   € 0    
POLAND | Construction division [Member] | Budimex D Sp. z o.o.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   76.00%    
Net cost ownership   € 0    
POLAND | Construction division [Member] | Budimex R Sp. z o.o.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
POLAND | Construction division [Member] | Budimex P Sp. z o.o.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
POLAND | Construction division [Member] | Budimex O Sp. z o.o.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
POLAND | Construction division [Member] | Circular Construction SA        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
POLAND | Construction division [Member] | Budimex Most Wschodni S.A.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
POLAND | Construction division [Member] | FBSerwis Paliwa Alternatywne Sp. z o.o. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
POLAND | Construction division [Member] | FBSerwis Odbiór Sp. z o.o. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
POLAND | Construction division [Member] | FBSerwis B Sp. z o.o. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
POLAND | Construction division [Member] | FBSerwis A Sp. z o.o. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
POLAND | Construction division [Member] | FBSerwis Zielona Karpatia Sp. z o.o.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
POLAND | Construction division [Member] | FBSerwis Zielony Dolny Śląsk Sp. z o.o.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
POLAND | Construction division [Member] | FBSerwis Zielony Wrocław Sp. z o.o.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
POLAND | Construction division [Member] | Magnolia Energy Sp. z o.o.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 9,000,000    
POLAND | Construction division [Member] | Budimex PPP SA        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 4,000,000    
POLAND | Construction division [Member] | Budimex F Sp. z o.o.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
POLAND | Construction division [Member] | Budimex A Sp. z o.o.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
PUERTO RICO | Construction division [Member] | Ditecpesa PR, LLC        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 1,000,000    
PUERTO RICO | Construction division [Member] | Ferrovial Construcción Puerto Rico, LLC        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 25,000,000    
INDIA | Toll roads division [Member] | IRB infrastructure developers limited [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in associate   19.90%    
Investments in associates accounted for using equity method   € 315,000,000    
Assets   5,025,000,000    
Liabilities   3,463,000,000    
Revenue   894,000,000    
Profit (loss)   € 50,000,000    
INDIA | Toll roads division [Member] | I IRB Infrastructure Trust        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in associate   51.00%    
Investments in associates accounted for using equity method   € 704,000,000    
Assets   4,800,000,000    
Liabilities   3,107,000,000    
Revenue   243,000,000    
Profit (loss)   € (24,000,000)    
INDIA | Toll roads division [Member] | II IRB Infrastructure Trust        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in associate   24.00%    
Investments in associates accounted for using equity method   € 0    
Assets   0    
Liabilities   0    
Revenue   0    
Profit (loss)   € 0    
INDIA | Toll roads division [Member] | I MMK Toll Road Private Limited        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in associate   51.00%    
Investments in associates accounted for using equity method   € 0    
Assets   1,000,000    
Liabilities   0    
Revenue   0    
Profit (loss)   € 0    
INDIA | Toll roads division [Member] | II MMK Toll Road Private Limited        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in associate   24.00%    
Investments in associates accounted for using equity method   € 0    
Assets   0    
Liabilities   0    
Revenue   0    
Profit (loss)   € 0    
INDIA | Toll roads division [Member] | Cinfra India Private Limited        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   99.99%    
Net cost ownership   € 0    
PORTUGAL | Toll roads division [Member] | Vialivre, S.A. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   84.00%    
Net cost ownership   € 0    
TURKIYE | Airports division [Member] | YDA HAVALIMANI YATIRIM VE (Dalaman)        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   60.00%    
Net cost ownership   € 145,000,000    
QATAR | Airports division [Member] | FMM Company LLC [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in associate   49.00%    
Investments in associates accounted for using equity method   € 18,000,000    
Assets   78,000,000    
Liabilities   38,000,000    
Revenue   109,000,000    
Profit (loss)   € 14,000,000    
NETHERLANDS | Corporation division [Member] | Ferrovial Netherlands B.V. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 80,000,000    
NETHERLANDS | Corporation division [Member] | Ferrovial Ventures Netherlands B.V.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 9,000,000    
NETHERLANDS | Construction division [Member] | Ferrovial Construction International SE [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 761,000,000    
NETHERLANDS | Toll roads division [Member] | Cintra Infrastructures SE [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 3,021,000,000    
NETHERLANDS | Toll roads division [Member] | Cintra Global SE [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 3,242,000,000    
NETHERLANDS | Toll roads division [Member] | 407 Toronto Highway B.V. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 2,664,000,000    
NETHERLANDS | Toll roads division [Member] | Cintra INR Investments B.V. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 369,000,000    
NETHERLANDS | Toll roads division [Member] | Cintra Projects B.V        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
NETHERLANDS | Airports division [Member] | Hubco Netherlands B.V. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 807,000,000    
NETHERLANDS | Airports division [Member] | FERROVIAL AIRPORTS FMM BV [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 5,000,000    
NETHERLANDS | Airports division [Member] | Ferrovial Airports Turkey B.V. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 152,000,000    
NETHERLANDS | Energy and mobility infrastructures division [Member] | Ferrovial Services International, SE        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 76,000,000    
NETHERLANDS | Energy and mobility infrastructures division [Member] | Ferrovial Transco International B.V.        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 89,000,000    
IRELAND | Corporation division [Member] | Landmille, Ltd [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 1,000,000    
IRELAND | Construction division [Member] | Ferrovial Construction Ireland Ltd [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 8,000,000    
GERMANY | Construction division [Member] | Budimex Bau GmbH [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 0    
GERMANY | Construction division [Member] | RailBX GmbH        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 6,000,000    
LUXEMBOURG | Corporation division [Member] | Krypton RE, S.A. [Member]        
Disclosure of subsidiaries [line items]        
Proportion of ownership interest in subsidiary   100.00%    
Net cost ownership   € 8,000,000