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Equity Shareholders Own Interest (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Non controlling interest item [Line Items]      
Assets € 28,999 € 26,318  
Liabilities 20,879 20,439  
Profit (loss), attributable to owners of parent 3,239 341 € 188
Autop terrassa manresa SA [Member]      
Non controlling interest item [Line Items]      
Assets 573 590  
Liabilities 138 196  
Shareholder funds 436 394  
Net cash position 8 18  
Profit (loss), attributable to owners of parent 25 27  
LBJ infrastructure group [Member]      
Non controlling interest item [Line Items]      
Assets 2,197 2,084  
Liabilities 2,462 2,296  
Shareholder funds (265) (212)  
Net cash position (1,959) (1,828)  
Profit (loss), attributable to owners of parent 33 24  
NTE mobility partners [Member]      
Non controlling interest item [Line Items]      
Assets 2,128 1,967  
Liabilities 2,117 1,954  
Shareholder funds 11 13  
Net cash position (1,285) (1,144)  
Profit (loss), attributable to owners of parent 101 102  
NTE mobility partners segments LLC [Member]      
Non controlling interest item [Line Items]      
Assets 2,129 2,019  
Liabilities 1,857 1,735  
Shareholder funds 272 284  
Net cash position (1,581) (1,471)  
Profit (loss), attributable to owners of parent 70 48  
I77 mobility partners [Member]      
Non controlling interest item [Line Items]      
Assets 708 775  
Liabilities 688 509  
Shareholder funds 20 266  
Net cash position (450) (183)  
Profit (loss), attributable to owners of parent 23 31  
I66 mobility partners [Member]      
Non controlling interest item [Line Items]      
Assets 6,276 6,108  
Liabilities 2,676 2,567  
Shareholder funds 3,600 3,542  
Net cash position (1,672) (1,469)  
Profit (loss), attributable to owners of parent (4) (20)  
Budimex S.A [Member]      
Non controlling interest item [Line Items]      
Assets 1,907 2,029  
Liabilities 1,565 1,616  
Shareholder funds 342 413  
Net cash position 726 874  
Profit (loss), attributable to owners of parent 74 80  
Dalaman international airport [Member]      
Non controlling interest item [Line Items]      
Assets 717 710  
Liabilities 428 478  
Shareholder funds 289 232  
Net cash position (61) (86)  
Profit (loss), attributable to owners of parent € 35 € (10)