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Capital and financing structure (Details) - EUR (€) € in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023
Infrastructure project [Member] |  |
Capital and financing structure [Line Items] |  |
Debt securities and bank borrowings of infrastructure projects | € 8,400 | € 7,915
Increase decrease net draw downs borrowings of infrastructure projects | 34 |
Increase decrease exchange rate effects borrowings of infrastructure projects | 472 |
Increase decrease changes in the scope of consolidation borrowings of infrastructure projects | (22) |
Exinfrastructure project [Member] |  |
Capital and financing structure [Line Items] |  |
Debt securities and bank borrowings of infrastructure projects | 2,886 | € 3,463
Increase decrease net draw downs borrowings of infrastructure projects | (580) |
Increase decrease exchange rate effects borrowings of infrastructure projects | 4 |
Increase decrease changes in the scope of consolidation borrowings of infrastructure projects | € 0 |

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