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Right-of-use assets and associated liabilities (Details) - EUR (€)
€ in Millions
Dec. 31, 2030
Dec. 31, 2029
Dec. 31, 2028
Dec. 31, 2027
Dec. 31, 2026
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of maturity analysis of operating lease payments [line items]                  
Lease liabilities             € 245 € 200 € 184
Corporation division [Member]                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Lease liabilities             26    
Construction division [Member]                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Lease liabilities             185    
Toll roads division [Member]                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Lease liabilities             4    
Other division [Member]                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Lease liabilities             € 30    
Not later than one year [member]                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Lease liabilities           € 80      
Not later than one year [member] | Corporation division [Member]                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Lease liabilities           3      
Not later than one year [member] | Construction division [Member]                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Lease liabilities           68      
Not later than one year [member] | Toll roads division [Member]                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Lease liabilities           2      
Not later than one year [member] | Other division [Member]                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Lease liabilities           € 7      
Later than one year and not later than two years [member]                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Lease liabilities         € 53        
Later than one year and not later than two years [member] | Corporation division [Member]                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Lease liabilities         3        
Later than one year and not later than two years [member] | Construction division [Member]                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Lease liabilities         44        
Later than one year and not later than two years [member] | Toll roads division [Member]                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Lease liabilities         2        
Later than one year and not later than two years [member] | Other division [Member]                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Lease liabilities         € 4        
Later than two years and not later than three years [member]                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Lease liabilities       € 31          
Later than two years and not later than three years [member] | Corporation division [Member]                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Lease liabilities       3          
Later than two years and not later than three years [member] | Construction division [Member]                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Lease liabilities       27          
Later than two years and not later than three years [member] | Toll roads division [Member]                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Lease liabilities       0          
Later than two years and not later than three years [member] | Other division [Member]                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Lease liabilities       € 1          
Later than three years and not later than four years [member]                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Lease liabilities     € 17            
Later than three years and not later than four years [member] | Corporation division [Member]                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Lease liabilities     3            
Later than three years and not later than four years [member] | Construction division [Member]                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Lease liabilities     14            
Later than three years and not later than four years [member] | Toll roads division [Member]                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Lease liabilities     0            
Later than three years and not later than four years [member] | Other division [Member]                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Lease liabilities     € 0            
Later than four years and not later than five years [member]                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Lease liabilities   € 11              
Later than four years and not later than five years [member] | Corporation division [Member]                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Lease liabilities   3              
Later than four years and not later than five years [member] | Construction division [Member]                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Lease liabilities   8              
Later than four years and not later than five years [member] | Toll roads division [Member]                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Lease liabilities   0              
Later than four years and not later than five years [member] | Other division [Member]                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Lease liabilities   € 0              
Later than five years [member]                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Lease liabilities € 53                
Later than five years [member] | Corporation division [Member]                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Lease liabilities 11                
Later than five years [member] | Construction division [Member]                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Lease liabilities 24                
Later than five years [member] | Toll roads division [Member]                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Lease liabilities 0                
Later than five years [member] | Other division [Member]                  
Disclosure of maturity analysis of operating lease payments [line items]                  
Lease liabilities € 18