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Cash and cash equivalents and borrowings for infrastructure projects (Details) - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of credit limits and credit drawable for infrastructure projects [Line Items]    
Borrowings € 11,288 € 11,378
Infrastructure project [Member]    
Disclosure of credit limits and credit drawable for infrastructure projects [Line Items]    
Credit limit 8,567 8,070
Credit utilized 8,554 8,070
Credit drawable 13 1
Borrowings 8,400 7,915
Infrastructure project [Member] | Toll roads division [Member]    
Disclosure of credit limits and credit drawable for infrastructure projects [Line Items]    
Credit limit 8,091 7,545
Credit utilized 8,082 7,545
Credit drawable 9 0
Borrowings 7,945 7,410
Infrastructure project [Member] | US toll roads [Member]    
Disclosure of credit limits and credit drawable for infrastructure projects [Line Items]    
Credit limit 7,479 6,889
Credit utilized 7,479 6,889
Credit drawable 0 0
Borrowings 7,338 6,749
Infrastructure project [Member] | Spanish toll roads [Member]    
Disclosure of credit limits and credit drawable for infrastructure projects [Line Items]    
Credit limit 593 623
Credit utilized 584 623
Credit drawable 9 0
Borrowings 587 628
Infrastructure project [Member] | Other concessions [Member]    
Disclosure of credit limits and credit drawable for infrastructure projects [Line Items]    
Credit limit 19 33
Credit utilized 19 33
Credit drawable 0 0
Borrowings 19 33
Infrastructure project [Member] | Energy and mobility infrastructures division [Member]    
Disclosure of credit limits and credit drawable for infrastructure projects [Line Items]    
Credit limit 220 255
Credit utilized 216 255
Credit drawable 4 0
Borrowings 211 246
Infrastructure project [Member] | Airports division [Member]    
Disclosure of credit limits and credit drawable for infrastructure projects [Line Items]    
Credit limit 105 115
Credit utilized 105 115
Credit drawable 0 0
Borrowings 94 104
Infrastructure project [Member] | Construction division [Member]    
Disclosure of credit limits and credit drawable for infrastructure projects [Line Items]    
Credit limit 103 106
Credit utilized 102 106
Credit drawable 0 1
Borrowings 103 106
Infrastructure project [Member] | Other division [Member]    
Disclosure of credit limits and credit drawable for infrastructure projects [Line Items]    
Credit limit 49 49
Credit utilized 49 49
Credit drawable 0 0
Borrowings € 47 € 49