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Non-current financial assets (Details) - EUR (€) € in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2024 | Dec. 31, 2022
Disclosure of financial assets [line items] |  |  |  |
Other non current financial assets other than derivatives and infrastructure projects | € 1,139 | € 1,148 | € 1,139 | € 1,095
Increase decrease in non current financial assets additions | 730 | 497 |  |
Increase decrease in non current financial assets disposals | (489) | (423) |  |
Increase decrease in non current financial assets transfer and other | (287) | (12) |  |
Increase decrease in non current financial assets exchange rate | 37 | (9) |  |
Long term loans in associates [Member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Other non current financial assets other than derivatives and infrastructure projects |  | 262 | 100 | 247
Increase decrease in non current financial assets additions | 113 | 40 |  |
Increase decrease in non current financial assets disposals | (3) | (37) |  |
Increase decrease in non current financial assets transfer and other | (273) | 0 |  |
Increase decrease in non current financial assets exchange rate | 1 | 12 |  |
Restricted cash from infrastructure project companies and other financial assets [Member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Other non current financial assets other than derivatives and infrastructure projects |  | 628 | 401 | 597
Increase decrease in non current financial assets additions | 18 | 432 |  |
Increase decrease in non current financial assets disposals | (275) | (381) |  |
Increase decrease in non current financial assets transfer and other |  | 0 |  |
Increase decrease in non current financial assets exchange rate | 30 | (20) |  |
Financial investment carried at fair value [Member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Other non current financial assets other than derivatives and infrastructure projects |  | 45 | 610 | 35
Increase decrease in non current financial assets additions | 566 | 9 |  |
Increase decrease in non current financial assets disposals | (2) | 0 |  |
Increase decrease in non current financial assets transfer and other | (1) | 1 |  |
Increase decrease in non current financial assets exchange rate | 2 | 0 |  |
Loans associated with the divestment transactions [Member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Other non current financial assets other than derivatives and infrastructure projects |  | 186 | 0 | 189
Increase decrease in non current financial assets additions | 1 | 10 |  |
Increase decrease in non current financial assets disposals | (176) | 0 |  |
Increase decrease in non current financial assets transfer and other | (13) | (13) |  |
Increase decrease in non current financial assets exchange rate | 2 | 0 |  |
Other long term receivables [Member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Other non current financial assets other than derivatives and infrastructure projects |  | 27 | € 28 | € 27
Increase decrease in non current financial assets additions | 32 | 6 |  |
Increase decrease in non current financial assets disposals | (33) | (5) |  |
Increase decrease in non current financial assets transfer and other | 0 | 0 |  |
Increase decrease in non current financial assets exchange rate | € 2 | € (1) |  |

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