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Intangible assets - Additional information (Details) - EUR (€) € in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Oct. 28, 2021 | Jun. 03, 2021 | Apr. 07, 2021
Intangible assets |  |  |  |  |
Write-off | € 35 | € 24 |  |  |
Change in the scope of consolidation | 1,835 | 77 |  |  |
Goodwill | 2,862 | € 1,297 |  |  |
Be Power |  |  |  |  |
Intangible assets |  |  |  |  |
Change in the scope of consolidation | € 728 |  |  |  |
Percentage of voting equity interests acquired | 100.00% |  |  |  |
Goodwill | € 728 |  |  |  |
Aldro Energa Y Soluciones SLU |  |  |  |  |
Intangible assets |  |  |  |  |
Change in the scope of consolidation | € 168 |  |  |  |
Percentage of voting equity interests acquired | 100.00% |  |  |  | 100.00%
Portfolio Of Thirteen Onshore Wind Facilities |  |  |  |  |
Intangible assets |  |  |  |  |
Change in the scope of consolidation | € 302 |  |  |  |
Dhamma Energy Group |  |  |  |  |
Intangible assets |  |  |  |  |
Change in the scope of consolidation | 120 |  |  |  |
Finproject SpA |  |  |  |  |
Intangible assets |  |  |  |  |
Change in the scope of consolidation | 93 |  |  |  |
Percentage of voting equity interests acquired |  |  | 60.00% |  |
Portfolio Of Nine Renewable Energy Projects |  |  |  |  |
Intangible assets |  |  |  |  |
Change in the scope of consolidation | 81 |  |  |  |
FRI-EL Biogas Holding SpA |  |  |  |  |
Intangible assets |  |  |  |  |
Change in the scope of consolidation | € 80 |  |  |  |
Percentage of voting equity interests acquired | 100.00% |  |  | 100.00% |
CGU Domestic-Foreign Market |  |  |  |  |
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% | 0.00% |  |  |
Discount rate applied to cash flow projections | 4.90% |  |  |  |
Amount by which unit's recoverable amount exceeds its carrying amount | € 5,000 |  |  |  |
CGU Domestic-Foreign Market | Aldro Energa Y Soluciones SLU |  |  |  |  |
Intangible assets |  |  |  |  |
Percentage of voting equity interests acquired | 100.00% |  |  |  |
Goodwill | € 168 |  |  |  |
CGU Domestic-Foreign Market | Minorities of former Italgas |  |  |  |  |
Intangible assets |  |  |  |  |
Goodwill | 706 |  |  |  |
CGU Domestic-Foreign Market | Local Italian companies synergic to main areas of activity |  |  |  |  |
Intangible assets |  |  |  |  |
Goodwill | 198 |  |  |  |
CGU Domestic-Foreign Market | Eni Gas and Power France SA |  |  |  |  |
Intangible assets |  |  |  |  |
Goodwill | 95 |  |  |  |
Accumulated impairment |  |  |  |  |
Intangible assets |  |  |  |  |
Goodwill | (2,500) |  |  |  |
Exploration rights |  |  |  |  |
Intangible assets |  |  |  |  |
Write-off | 35 | € 19 |  |  |
Capitalized costs for customer acquisition | Plenitude & Power |  |  |  |  |
Intangible assets |  |  |  |  |
Intangible assets other than goodwill | 348 | 262 |  |  |
Concessions, licenses, trademarks and similar items |  |  |  |  |
Intangible assets |  |  |  |  |
Intangible assets other than goodwill | 139 | 88 |  |  |
Transport rights of natural gas |  |  |  |  |
Intangible assets |  |  |  |  |
Intangible assets other than goodwill | 32 | 25 |  |  |
Customer relationship |  |  |  |  |
Intangible assets |  |  |  |  |
Intangible assets other than goodwill | 109 |  |  |  |
Intangible assets in progress |  |  |  |  |
Intangible assets |  |  |  |  |
Intangible assets other than goodwill | € 78 | € 78 |  |  |

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