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Cash and cash equivalents - Narrative (Details)
€ in Thousands, $ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2027
EUR (€)
Dec. 31, 2025
EUR (€)
Dec. 31, 2024
EUR (€)
Dec. 31, 2023
EUR (€)
Dec. 31, 2058
Dec. 31, 2057
Rate
Dec. 31, 2049
USD ($)
Dec. 31, 2032
EUR (€)
Dec. 31, 2031
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
CAD ($)
Nov. 01, 2023
USD ($)
Aug. 01, 2023
USD ($)
Dec. 31, 2022
EUR (€)
Dec. 31, 2018
EUR (€)
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Cash and cash equivalents infrastructure projects     € 175,000 € 204,000                        
Current restricted cash and cash equivalents     18,000 31,000                        
Non-current restricted cash and cash equivalents     401,000 628,000                        
Cash and cash equivalents excluding infrastructure projects     4,653,000 4,585,000               $ 207        
Notional amount     6,438,000 4,990                        
Borrowings     11,288,000 11,378,000                        
Balance working capital     (1,182,000) (1,511,000)                     € (1,353,000)  
Centella transmisión S.A. [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Import refinancing operation     112,600                          
Returned the line of credit     31,000                          
Not later than one year [member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Notional amount   € 3,005,000                            
At fair value [member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Net financial derivatives     109,000 109,000                     153,000  
Cross currency swaps [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Notional amount     1,712,000             $ 260,000            
Derivative financial liabilities               € 139,000                
Cross currency swaps [Member] | Corporate cross currency swaps [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Notional amount   250,000                            
Cross currency swaps [Member] | At fair value [member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Notional amount       (13,000)                        
Net financial derivatives       42,000                     58,000  
Derivative financial liabilities     40,000                          
Interest rate derivatives [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Notional amount     1,272,000                          
Interest rate derivatives [Member] | At fair value [member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Net financial derivatives       (57,000)                     € (39,000)  
Corporate bonds and debentures [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Amortization of the issued bond     300,000                          
Other borrowings [Member] | Not later than one year [member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Notional amount   500,000                            
NTE mobility partners segments 3 LLC | TIFIA loan [Member] | US toll roads [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Balance working capital     € 437,700                          
NTE mobility partners segments 3 LLC | Segment 3C [Member] | US toll roads [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Bonds issued including the premium | $                   $ 750,000            
LBJ infrastructure group [Member] | Final maturity in 2051 [Member] | US toll roads [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Number of fixed rate listed bonds included in the senior loan     6.57%             6.57%            
I77 mobility partners [Member] | US toll roads [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Operator completed concession for the broadcast     € 371,000                          
NTE mobility partners [Member] | US toll roads [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Bonds issued | $                           $ 397,000    
NTE mobility partners [Member] | US toll roads [Member] | Interest rate derivatives [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Bonds issued | $                 $ 209,000 $ 122,800            
NTE mobility partners [Member] | Taxable bonds [Member] | Final maturity in 2049 [Member] | US toll roads [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Bonds issued | $             $ 871,100                  
NTE mobility partners [Member] | Private activity bonds [Member] | US toll roads [Member] | Interest rate derivatives [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Bonds issued | $                   $ 331,800            
NTE mobility partners [Member] | Private activity bonds [Member] | Segment 3A-3B [Member] | US toll roads [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Bonds issued | $                         $ 122,600      
Bonds Issued with a fixed interest rate of 5% [Member] | $                         $ 32,400      
Borrowing interest rate on USD 22.5 million [Member]                         5.13%      
Bonds Issued with a fixed interest rate of 5.13% [Member] | $                         $ 22,500      
Borrowing interest rate on USD 23.7 million [Member]                         5.25%      
Bonds Issued with a fixed interest rate of 5.38% [Member] | $                         $ 23,700      
Borrowing interest rate on USD 122.6 million [Member]                         5.50%      
Bonds Issued with a fixed interest rate of 5.50% [Member] | $                         $ 64,700      
Borrowing interest rate on USD 64.7 million [Member]                         5.38%      
NTE mobility partners [Member] | Fixed interest rate [member] | US toll roads [Member] | Interest rate derivatives [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Borrowings, interest rate     4.00%             4.00%            
NTE mobility partners [Member] | Fixed interest rate [member] | Private activity bonds [Member] | US toll roads [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Borrowings, interest rate                           5.50%    
Borrowing interest rate on USD 32,4 million [Member]                         5.00%      
NTE mobility partners [Member] | Fixed interest rate [member] | Lower fixed interest rate [Member] | US toll roads [Member] | Interest rate derivatives [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Borrowings, interest rate     3.92%             3.92%            
NTE mobility partners [Member] | Fixed interest rate [member] | Higher fixed interest rate [Member] | US toll roads [Member] | Interest rate derivatives [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Borrowings, interest rate     5.00%             5.00%            
Infrastructure project [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Non-current restricted cash and cash equivalents     € 380,000 596,000                        
Restricted cash and cash equivalents     398,000 627,000                        
Increase decrease restricted cash and cash equivalents       (228,000)                        
Increase decrease restricted cash and cash equivalents excluding effect of exchange rate changes     29,000                          
Bonds issued     5,199,000 4,442,000                        
Bank borrowings     3,200,000 3,473,000                        
Notional amount     8,554,000 8,070,000                        
Increase decrease in borrowings other infrastructure project company       (64,000)                        
Borrowings     8,400,000 7,915,000                        
Difference between the nominal values and carrying amounts of the borrowings     154,000 155,000                        
Credit drawable     13,000 1,000                        
Credit limit     8,567,000 8,070,000                        
Credit utilized     8,554,000 8,070,000                        
Total liquidity     557,000 817,000                        
Increase decrease in borrowing excluding the foreign exchange effect and scope changes       34,000                        
Infrastructure project [Member] | Not later than one year [member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Notional amount   121,000 76,000                          
Infrastructure project [Member] | At fair value [member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Borrowings     6,774,000 7,565,000                        
Infrastructure project [Member] | Carrying amount [Domain]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Borrowings     8,400,000 7,915,000                        
Infrastructure project [Member] | Toll roads division [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Increase decrease restricted cash and cash equivalents excluding effect of exchange rate changes     (257,000)                          
Borrowings     7,945,000 7,410,000                        
Credit drawable     9,000 0                        
Credit limit     8,091,000 7,545,000                        
Credit utilized     8,082,000 7,545,000                        
Infrastructure project [Member] | Toll roads division [Member] | US toll roads [Member] | I66 mobility partners [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Borrowings | $                   $ 2,084,000            
Infrastructure project [Member] | Toll roads division [Member] | US toll roads [Member] | I-77 Mobility Partners LLC [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Borrowings | $                   471,000            
Infrastructure project [Member] | Toll roads division [Member] | US toll roads [Member] | LBJ infrastructure group [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Borrowings | $                   2,007,000            
Infrastructure project [Member] | Toll roads division [Member] | US toll roads [Member] | NTE mobility partners segments 3 LLC                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Borrowings | $                   1,578,000            
Infrastructure project [Member] | Toll roads division [Member] | US toll roads [Member] | NTE mobility partners [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Borrowings | $                   1,600,000            
Infrastructure project [Member] | Toll roads division [Member] | Spanish toll roads [Member] | Cintra Inversora Autopistas de Cataluña, S.L. (a) [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Borrowings     584,900                          
Infrastructure project [Member] | Energy and mobility infrastructures division [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Borrowings     211,000 246,000                        
Credit drawable     4,000 0                        
Credit limit     220,000 255,000                        
Credit utilized     216,000 255,000                        
Infrastructure project [Member] | US toll roads [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Borrowings     7,338,000 6,749,000                        
Credit drawable     0 0                        
Credit limit     7,479,000 6,889,000                        
Credit utilized     7,479,000 6,889,000                        
Infrastructure project [Member] | Construction division [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Borrowings     103,000 106,000                        
Credit drawable     0 1,000                        
Credit limit     103,000 106,000                        
Credit utilized     102,000 106,000                        
Infrastructure project [Member] | Other european toll roads [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Current restricted cash and cash equivalents     26,000                          
Restricted cash and cash equivalents     9,000                          
Infrastructure project [Member] | Aragon toll road [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Restricted cash and cash equivalents     17,000                          
Infrastructure project [Member] | NTE mobility partners segments 3 LLC                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Restricted cash and cash equivalents     € 22,000 23,000                        
Infrastructure project [Member] | NTE mobility partners segments 3 LLC | Segment 3A-3B [Member] | US toll roads [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Bank borrowings | $                     $ 221,000          
Infrastructure project [Member] | NTE mobility partners segments 3 LLC | Private activity bonds [Member] | Segment 3A-3B [Member] | US toll roads [Member] | Top of range [member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Bonds issued | $                         $ 265,900      
Infrastructure project [Member] | NTE mobility partners segments 3 LLC | Private activity bonds [Member] | Segment 3C [Member] | US toll roads [Member] | Interest rate derivatives [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Bonds issued | $                   $ 653,900            
Infrastructure project [Member] | NTE mobility partners segments 3 LLC | Fixed interest rate [member] | Segment 3A-3B [Member] | TIFIA loan [Member] | US toll roads [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Borrowings, interest rate     3.84%             3.84%            
Infrastructure project [Member] | NTE mobility partners segments 3 LLC | Fixed interest rate [member] | Segment 3C [Member] | US toll roads [Member] | Interest rate derivatives [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Borrowings, interest rate     5.00%             5.00%            
Infrastructure project [Member] | LBJ infrastructure group [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Restricted cash and cash equivalents     € 12,000                          
Increase decrease restricted cash and cash equivalents excluding effect of exchange rate changes       € 7,000                        
Infrastructure project [Member] | LBJ infrastructure group [Member] | US toll roads [Member] | Interest rate derivatives [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Bonds issued | $                   $ 7,000            
Bonds issued including the premium | $                   615,000            
Infrastructure project [Member] | LBJ infrastructure group [Member] | TIFIA loan [Member] | US toll roads [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Bank borrowings | $                   835,600            
Infrastructure project [Member] | LBJ infrastructure group [Member] | Credit line [Member] | US toll roads [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Amount drawn from the line of credit for CAPEX investments | $                   18,000            
Infrastructure project [Member] | LBJ infrastructure group [Member] | Taxable bonds [Member] | US toll roads [Member] | Interest rate derivatives [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Bonds issued | $                   615,500            
Infrastructure project [Member] | LBJ infrastructure group [Member] | Private activity bonds [Member] | US toll roads [Member] | Interest rate derivatives [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Bonds issued | $                   537,500            
Infrastructure project [Member] | LBJ infrastructure group [Member] | Lower fixed interest rate [Member] | US toll roads [Member] | Interest rate derivatives [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Bonds issued | $                   $ 608,500            
Infrastructure project [Member] | LBJ infrastructure group [Member] | Fixed interest rate [member] | US toll roads [Member] | Interest rate derivatives [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Borrowings, interest rate     4.00%             4.00%            
Infrastructure project [Member] | LBJ infrastructure group [Member] | Fixed interest rate [member] | TIFIA loan [Member] | US toll roads [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Borrowings, interest rate     4.22%             4.22%            
Infrastructure project [Member] | LBJ infrastructure group [Member] | Fixed interest rate [member] | Credit line [Member] | US toll roads [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Borrowings, interest rate       4.51%             4.51% 4.51%        
Infrastructure project [Member] | LBJ infrastructure group [Member] | Fixed interest rate [member] | Lower fixed interest rate [Member] | US toll roads [Member] | Interest rate derivatives [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Borrowings, interest rate 2.75%                              
Infrastructure project [Member] | LBJ infrastructure group [Member] | Fixed interest rate [member] | Higher fixed interest rate [Member] | US toll roads [Member] | Interest rate derivatives [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Borrowings, interest rate         3.80%                      
Infrastructure project [Member] | I77 mobility partners [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Increase decrease restricted cash and cash equivalents excluding effect of exchange rate changes     € (101,000) € 99,000                        
Infrastructure project [Member] | I77 mobility partners [Member] | US toll roads [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Bonds issued | $                   $ 100,000            
Infrastructure project [Member] | I77 mobility partners [Member] | Fixed interest rate [member] | US toll roads [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Borrowings, interest rate     5.00%             5.00%            
Infrastructure project [Member] | I66 mobility partners [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Restricted cash and cash equivalents     € 57,000 134,000                        
Increase decrease restricted cash and cash equivalents excluding effect of exchange rate changes     € (82,000)                          
Infrastructure project [Member] | I66 mobility partners [Member] | TIFIA loan [Member] | US toll roads [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Bank borrowings | $                   $ 1,346,900            
Infrastructure project [Member] | I66 mobility partners [Member] | Borrowings principal [Member] | TIFIA loan [Member] | Final maturity in 2057 [Member] | US toll roads [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Bank borrowings | $                   21,200            
Infrastructure project [Member] | I66 mobility partners [Member] | Private activity bonds [Member] | US toll roads [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Bonds issued | $                   737,000            
Infrastructure project [Member] | I66 mobility partners [Member] | Lower fixed interest rate [Member] | US toll roads [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Bonds issued including the premium | $                   $ 800,400            
Infrastructure project [Member] | I66 mobility partners [Member] | Fixed interest rate [member] | US toll roads [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Borrowings, interest rate     5.00%             5.00%            
Infrastructure project [Member] | I66 mobility partners [Member] | Fixed interest rate [member] | TIFIA loan [Member] | US toll roads [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Borrowings, interest rate | Rate           2.80%                    
Infrastructure project [Member] | NTE mobility partners [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Restricted cash and cash equivalents     € 281,000 333,000                        
Increase decrease restricted cash and cash equivalents excluding effect of exchange rate changes     € (70,000)                          
Infrastructure project [Member] | Autop terrassa manresa SA [Member] | Spanish toll roads [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Fixed interest rate guaranteed by the derivative arranged     5.2064%                          
Net financial derivatives     € (83,400)                          
Infrastructure project [Member] | Autop terrassa manresa SA [Member] | Final maturity in 2035 [Member] | Spanish toll roads [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Notional amount     551,700                          
Infrastructure project [Member] | Autop terrassa manresa SA [Member] | Tranche a member [Member] | Spanish toll roads [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Bank borrowings     264,900                          
Infrastructure project [Member] | Autop terrassa manresa SA [Member] | Tranche b member [Member] | Spanish toll roads [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Bank borrowings     280,300                          
Infrastructure project [Member] | Autop terrassa manresa SA [Member] | Tranche c member [Member] | Spanish toll roads [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Bank borrowings     € 39,700                          
Infrastructure project [Member] | Autop terrassa manresa SA [Member] | Floating interest rate [member] | Tranche a member [Member] | Spanish toll roads [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Borrowings, interest rate     367.20%             367.20%            
Infrastructure project [Member] | Autop terrassa manresa SA [Member] | Floating interest rate [member] | Tranche b member [Member] | Spanish toll roads [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Borrowings, interest rate     150.00%             150.00%            
Infrastructure project [Member] | Autop terrassa manresa SA [Member] | Floating interest rate [member] | Tranche c member [Member] | Spanish toll roads [Member] | Bottom of range [member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Borrowings, interest rate     1.50%             1.50%            
Infrastructure project [Member] | Autop terrassa manresa SA [Member] | Floating interest rate [member] | Tranche c member [Member] | Spanish toll roads [Member] | Top of range [member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Borrowings, interest rate     367.20%             367.20%            
Infrastructure project [Member] | Other european concession [Member] | Euro commercial paper [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Restricted cash and cash equivalents       31,000                        
Infrastructure project [Member] | Other european concession [Member] | Aragon toll road [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Restricted cash and cash equivalents       17,000                        
Infrastructure project [Member] | Other european concession [Member] | Treatment plants in the united kingdom [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Restricted cash and cash equivalents       14,000                        
Exinfrastructure project [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Restricted cash and cash equivalents     € 22,000 37,000                        
Bonds issued     300,000                          
Notional amount     2,865,000 3,437,000                        
Borrowings     2,886,000 3,463,000                        
Borrowings excluding infrastructure project companies     2,889,000 3,449,000                        
Increase decrease in consolidated debt ECPs issued     (251,000)                          
Exinfrastructure project [Member] | Not later than one year [member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Notional amount   1,001,000 821,000                          
Exinfrastructure project [Member] | At fair value [member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Borrowings excluding infrastructure project companies     2,866,000 3,394,000                        
Exinfrastructure project [Member] | Carrying amount [Domain]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Borrowings excluding infrastructure project companies     2,889,000 3,449,000                        
Exinfrastructure project [Member] | Corporate debt [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Notional amount     2,839,000 3,391,000                        
Credit drawable     538,000 650,000                        
Credit limit     3,377,000 4,041,000                        
Credit utilized     2,839,000 3,391,000                        
Consolidated debt     2,852,000 3,386,000                        
Total liquidity     5,320,000 5,387,000                        
Exinfrastructure project [Member] | Corporate debt [Member] | Not later than one year [member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Notional amount   999,000 800,000                          
Exinfrastructure project [Member] | Corporate debt [Member] | At fair value [member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Borrowings excluding infrastructure project companies     2,830,000 3,331,000                        
Exinfrastructure project [Member] | Corporate debt [Member] | Carrying amount [Domain]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Borrowings excluding infrastructure project companies     2,852,000 3,386,000                        
Exinfrastructure project [Member] | Euro commercial paper [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Borrowings excluding infrastructure project companies     € 249,000 500,000                        
Reduction issued due to the variation of the EURO Commercial Paper       € (251,000)                        
Percentage of average cost     3.17% 4.09%           3.17% 4.09% 4.09%        
Average rate of outstanding bonds     3.74% 3.13%                        
Exinfrastructure project [Member] | Corporate bonds and debentures [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Borrowings excluding infrastructure project companies     € 2,292,000 € 2,590,000                        
Exinfrastructure project [Member] | Corporate bonds and debentures [Member] | Corporate debt [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Credit limit     788,000                         € 1,100
Credit utilized     250,000                          
Consolidated debt € 60,000                              
Average rate related to ferrovial loans 0.425%                              
Exinfrastructure project [Member] | Corporate bonds and debentures [Member] | Corporate debt [Member] | Bottom of range [member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Increase decrease in consolidated debt ECPs issued       (534,000)                        
Increase decrease in consolidated debt     (251,000)                          
Exinfrastructure project [Member] | Corporate bonds and debentures [Member] | Corporate debt [Member] | Cross currency swaps [Member] | At fair value [member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Notional amount     1,490                          
Derivative financial liabilities       (13,000)                        
Exinfrastructure project [Member] | Other borrowings [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Borrowings excluding infrastructure project companies     36,000 63,000                        
Exinfrastructure project [Member] | Other borrowings [Member] | Not later than one year [member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Increase decrease in consolidated debt ECPs issued   € 249,000                            
Exinfrastructure project [Member] | Construction division [Member] | Corporate debt [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Credit drawable     114,000 137,000                        
Credit limit     131,000 163,000                        
Credit utilized     17,000 26,000                        
Consolidated debt     € 14,000 13,000                        
Exinfrastructure project [Member] | Sustainability Target Euro-commercial [Member] | Euro commercial paper [Member] | Corporate debt [Member] | July [Member]                                
Detail of information about cash and cash equivalents and borrowings [Line Items]                                
Issued capital       € 1,500,000