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Going Concern Evaluation - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
EUR (€)
Dec. 31, 2023
EUR (€)
Dec. 31, 2023
CAD ($)
Corporate debt and other borrowings [Line Items]      
Expected shareholder distributions for an accumulated amount € (2.3)    
Assumption in a pessimistic scenario to analyze future cash needs percentage of reduction in additional dividends from infrastructure project companies airport and toll roads division in the airport 50.00%    
Assumption in a pessimistic scenario to analyze future cash of decrease per annum of the construction business cash flows in terms of 2022 working capital excluding provisions and lease payments € (200,000,000)    
Assumption in a pessimistic scenario to analyze future cash needs percentage of elimination of divestment of stake in heathrow airport 5.25%    
Assumption in a pessimistic scenario to analyze future cash needs contingent capital contributions per annum € 100,000,000    
Cash and cash equivalents excluding infrastructure projects 4,653,000,000 € 4,585,000,000 $ 207
Notional amount 6,438,000,000 4,990,000  
Exinfrastructure project [Member]      
Corporate debt and other borrowings [Line Items]      
Notional amount 2,865,000,000 3,437,000,000  
Other borrowings [Member] | Exinfrastructure project [Member]      
Corporate debt and other borrowings [Line Items]      
Credit drawable 114,000,000 139,000,000  
Notional amount 26,000,000 46,000,000  
Corporate debt [Member] | Exinfrastructure project [Member]      
Corporate debt and other borrowings [Line Items]      
Credit drawable 538,000,000 650,000,000  
Notional amount 2,839,000,000 € 3,391,000,000  
Heathrow Airport in London [Member]      
Corporate debt and other borrowings [Line Items]      
Notional amount € 2,700,000,000