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Subsequent events (Details) - EUR (€) € in Billions | 1 Months Ended
--- | ---
Mar. 31, 2024 | Jan. 31, 2024
Major business combination | Neptune Energy Group Limited ("Neptune") | Var Energi ASA |  |
Disclosure of non-adjusting events after reporting period [line items] |  |
Equity interest acquired (as a percent) |  | 100.00%
Business Combination, Purchase Price of Acquisition, Expected |  | € 2.0
Major ordinary share transactions | Energy Infrastructure Partners (EIP) | Eni Plenitude Spa SB |  |
Disclosure of non-adjusting events after reporting period [line items] |  |
Expected capital increase | € 0.6 |
Percentage of ownership interest divested | 7.60% |

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