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Personnel expenses business (Details) - EUR (€)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about the average workforce by business division [Line Items]      
Average number of employees 25,857 25,166 34,351
Percentage of variation average number of employee 3.00% (27.00%)  
Men [Member]      
Disclosure of detailed information about the average workforce by business division [Line Items]      
Average number of employees 21,333 20,855 27,029
Women [Member]      
Disclosure of detailed information about the average workforce by business division [Line Items]      
Average number of employees 4,523 4,311 7,322
Construction division [Member]      
Disclosure of detailed information about the average workforce by business division [Line Items]      
Average number of employees 18,299 19,412 18,451
Percentage of variation average number of employee (6.00%) 5.00%  
Construction division [Member] | Men [Member]      
Disclosure of detailed information about the average workforce by business division [Line Items]      
Average number of employees 14,944 16,067 15,316
Construction division [Member] | Women [Member]      
Disclosure of detailed information about the average workforce by business division [Line Items]      
Average number of employees 3,355 3,345 3,135
Toll roads division [Member]      
Disclosure of detailed information about the average workforce by business division [Line Items]      
Average number of employees 815 911 541
Percentage of variation average number of employee (11.00%) 68.00%  
Toll roads division [Member] | Men [Member]      
Disclosure of detailed information about the average workforce by business division [Line Items]      
Average number of employees 588 678 373
Toll roads division [Member] | Women [Member]      
Disclosure of detailed information about the average workforce by business division [Line Items]      
Average number of employees 227 233 169
Airports division [Member]      
Disclosure of detailed information about the average workforce by business division [Line Items]      
Average number of employees 248 237 235
Percentage of variation average number of employee 5.00% 1.00%  
Airports division [Member] | Men [Member]      
Disclosure of detailed information about the average workforce by business division [Line Items]      
Average number of employees 201 195 192
Airports division [Member] | Women [Member]      
Disclosure of detailed information about the average workforce by business division [Line Items]      
Average number of employees 46 42 43
Energy and mobility infrastructure division [Member]      
Disclosure of detailed information about the average workforce by business division [Line Items]      
Average number of employees 1,661 69 23
Percentage of variation average number of employee 2296.00% 202.00%  
Energy and mobility infrastructure division [Member] | Men [Member]      
Disclosure of detailed information about the average workforce by business division [Line Items]      
Average number of employees 1,460 48 17
Energy and mobility infrastructure division [Member] | Women [Member]      
Disclosure of detailed information about the average workforce by business division [Line Items]      
Average number of employees 201 21 6
Others [Member]      
Disclosure of detailed information about the average workforce by business division [Line Items]      
Average number of employees 4,834 4,536 4,402
Percentage of variation average number of employee 7.00% 3.00%  
Others [Member] | Men [Member]      
Disclosure of detailed information about the average workforce by business division [Line Items]      
Average number of employees 4,140 3,866 3,785
Others [Member] | Women [Member]      
Disclosure of detailed information about the average workforce by business division [Line Items]      
Average number of employees 694 670 617
Continuining operations of the company [Member]      
Disclosure of detailed information about the average workforce by business division [Line Items]      
Average number of employees     23,653
Continuining operations of the company [Member] | Men [Member]      
Disclosure of detailed information about the average workforce by business division [Line Items]      
Average number of employees     19,683
Continuining operations of the company [Member] | Women [Member]      
Disclosure of detailed information about the average workforce by business division [Line Items]      
Average number of employees     3,970
Discontinued operations of the company [Member]      
Disclosure of detailed information about the average workforce by business division [Line Items]      
Average number of employees     10,698
Discontinued operations of the company [Member] | Men [Member]      
Disclosure of detailed information about the average workforce by business division [Line Items]      
Average number of employees     7,346
Discontinued operations of the company [Member] | Women [Member]      
Disclosure of detailed information about the average workforce by business division [Line Items]      
Average number of employees     3,352