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Intangible assets - Additional information (Details) - EUR (€) € in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Aug. 04, 2022 | Dec. 31, 2020
Intangible assets |  |  |  |
Write-off | € 13 | € 35 |  |
Change in the scope of consolidation | 673 | 1,835 |  |
Other changes | 121 | 11 |  |
Goodwill | € 3,138 | 2,862 |  |
Assets held for sale | Eni Corridor Srl |  |  |  |
Intangible assets |  |  |  |
Equity interest disposed (as a percent) | 49.90% |  |  |
Plenitude |  |  |  |
Intangible assets |  |  |  |
Goodwill | € 2,927 | € 2,446 |  |
Be Power |  |  |  |
Intangible assets |  |  |  |
Equity interest acquired (as a percent) |  | 100.00% |  |
Aldro Energa Y Soluciones SLU |  |  |  |
Intangible assets |  |  |  |
Equity interest acquired (as a percent) |  | 100.00% |  |
Finproject SpA |  |  |  |
Intangible assets |  |  |  |
Equity interest acquired (as a percent) |  | 60.00% |  | 40.00%
Energia Eolica Boreas SLU | Plenitude |  |  |  |
Intangible assets |  |  |  |
Equity interest acquired (as a percent) |  |  | 100.00% |
CGU Domestic-Foreign Market | Retail sale of natural gas and electricity business of Plenitude |  |  |  |
Intangible assets |  |  |  |
Goodwill | € 1,214 |  |  |
Period over which management has projected cash flows | 4 years |  |  |
Growth rate used to extrapolate cash flow projections | 0.00% |  |  |
Amount by which unit's recoverable amount exceeds its carrying amount | € 7,000 |  |  |
CGU Domestic-Foreign Market | Retail sale of natural gas and electricity business of Plenitude | Minimum |  |  |  |
Intangible assets |  |  |  |
Discount rate | 4.20% |  |  |
CGU Domestic-Foreign Market | Retail sale of natural gas and electricity business of Plenitude | Maximum |  |  |  |
Intangible assets |  |  |  |
Discount rate | 4.30% |  |  |
CGU Domestic-Foreign Market | Renewables business of Plenitude |  |  |  |
Intangible assets |  |  |  |
Latest period of operations are being developed | 2 years |  |  |
Amount by which unit's recoverable amount exceeds its carrying amount if one percent point increase in weighted average cost of capital (WACC) | € 250 |  |  |
Goodwill | € 995 |  |  |
Period over which management has projected cash flows | 4 years |  |  |
CGU Domestic-Foreign Market | Renewables business of Plenitude | Minimum |  |  |  |
Intangible assets |  |  |  |
Discount rate | 5.20% |  |  |
CGU Domestic-Foreign Market | Renewables business of Plenitude | Maximum |  |  |  |
Intangible assets |  |  |  |
Discount rate | 5.80% |  |  |
CGU Domestic-Foreign Market | Be Power | E-mobility business of Plentitude |  |  |  |
Intangible assets |  |  |  |
Goodwill | € 718 |  |  |
Period over which management has projected cash flows | 4 years |  |  |
Discount rate | 10.70% |  |  |
Amount by which unit's recoverable amount exceeds its carrying amount | € 1,000 |  |  |
Accumulated impairment |  |  |  |
Intangible assets |  |  |  |
Goodwill | (2,662) |  |  |
Intangible assets with definite useful lives |  |  |  |
Intangible assets |  |  |  |
Write-off | 13 | € 35 |  |
Change in the scope of consolidation | 191 | 237 |  |
Other changes | 185 | 11 |  |
Intangible assets with definite useful lives | Definitive allocation |  |  |  |
Intangible assets |  |  |  |
Other changes | 277 |  |  |
Intangible assets with definite useful lives | Plenitude |  |  |  |
Intangible assets |  |  |  |
Change in the scope of consolidation | 391 |  |  |
Intangible assets with definite useful lives | Deconsolidated Entities |  |  |  |
Intangible assets |  |  |  |
Change in the scope of consolidation | (200) |  |  |
Intangible assets with definite useful lives | PLT Energia Srl and SEF Srl | Plenitude |  |  |  |
Intangible assets |  |  |  |
Change in the scope of consolidation | 217 |  |  |
Intangible assets with definite useful lives | Energia Eolica Boreas SLU | Plenitude |  |  |  |
Intangible assets |  |  |  |
Change in the scope of consolidation | 153 |  |  |
Exploration rights |  |  |  |
Intangible assets |  |  |  |
Write-off | 13 | 35 |  |
Change in the scope of consolidation | (200) |  |  |
Other changes | (2) |  |  |
Capitalized costs for customer acquisition | Plenitude & Power |  |  |  |
Intangible assets |  |  |  |
Intangible assets other than goodwill | 358 | 348 |  |
Concessions, licenses, trademarks and similar items |  |  |  |
Intangible assets |  |  |  |
Intangible assets other than goodwill | 692 | 139 |  |
Transport rights of natural gas | Assets held for sale |  |  |  |
Intangible assets |  |  |  |
Other changes | (115) |  |  |
Customer relationship |  |  |  |
Intangible assets |  |  |  |
Intangible assets other than goodwill | 101 | 109 |  |
Intangible assets in progress | Plenitude & Power |  |  |  |
Intangible assets |  |  |  |
Intangible assets other than goodwill | 615 |  |  |
Goodwill |  |  |  |
Intangible assets |  |  |  |
Change in the scope of consolidation | 482 | € 1,574 |  |
Other changes | (64) |  |  |
Goodwill | SKGR Energy Single Member SA |  |  |  |
Intangible assets |  |  |  |
Change in the scope of consolidation | € 52 |  |  |
Equity interest acquired (as a percent) | 100.00% |  |  |
Goodwill | PLT Energia Srl and SEF Srl |  |  |  |
Intangible assets |  |  |  |
Change in the scope of consolidation | € 412 |  |  |
Equity interest acquired (as a percent) | 100.00% |  |  |
Goodwill | Energia Eolica Boreas SLU |  |  |  |
Intangible assets |  |  |  |
Change in the scope of consolidation | € 18 |  |  |
Equity interest acquired (as a percent) | 100.00% |  |  |

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