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Capital and financing structure - Narrative (Details) - EUR (€) € in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023
Infrastructure project [Member] |  |
Capital and financing structure [Line Items] |  |
Increase decrease net draw downs borrowings of infrastructure projects | € 34 |
Increase decrease exchange rate effects borrowings of infrastructure projects | 472 |
Bonds issued | (5,199) | € (4,442)
Exinfrastructure project [Member] |  |
Capital and financing structure [Line Items] |  |
Increase decrease net draw downs borrowings of infrastructure projects | (580) |
Increase decrease exchange rate effects borrowings of infrastructure projects | 4 |
Bonds issued | (300) |
Increase decrease in consolidated debt ECPs issued | € (251) |

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