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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 |  |

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