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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

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