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Guarantees, commitments and risks - Additional information (Details) t in Thousands, $ in Millions | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
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May 31, 2021 EUR (€) item | Oct. 31, 2020 EUR (€) | Jul. 31, 2008 EUR (€) | Dec. 31, 2022 EUR (€) | Dec. 31, 2021 EUR (€) t instrument | Dec. 31, 2020 EUR (€) | Dec. 31, 2021 USD ($) | Mar. 15, 2021 EUR (€) | Mar. 10, 2021 EUR (€) | Dec. 31, 2019 EUR (€) | Mar. 31, 2017 EUR (€) | Dec. 31, 2012 EUR (€)
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Guarantees |  |  |  |  | € 10,160,000,000 | € 8,884,000,000 |  |  |  |  |  |
Capital commitments |  |  |  |  | 14,848,000,000 |  |  |  |  |  |  |
Investment agreed |  |  |  |  | 106,000,000 | 108,000,000 |  |  |  |  |  |
Risks |  |  |  |  | 934,000,000 | 600,000,000 |  |  |  |  |  |
Amount charged for contract of property |  |  |  |  | € 117,000,000 |  |  |  |  |  |  |
Period over which the management deems the liquidity reserves retained are enough to meet the financial obligations |  |  |  |  | 18 months |  |  |  |  |  |  |
Lease liabilities |  |  |  |  | € 5,337,000,000 | 5,018,000,000 |  |  |  | € 5,648,000,000 |  |
Contractual commitment, obligation of companies held for sale |  |  |  |  | € 67,000,000 |  |  |  |  |  |  |
Quantity of total emission of carbon dioxide | t |  |  |  |  | 17,740 |  |  |  |  |  |  |
Quantity of free emission allowance of carbon dioxide | t |  |  |  |  | 5,340 |  |  |  |  |  |  |
Deficit quantity of emission allowance of carbon dioxide | t |  |  |  |  | 12,400 |  |  |  |  |  |  |
Perpetual subordinated bonds |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | € 5,000,000,000 |  |  |  |  |  |  |
Number of euro-denominated perpetual subordinated hybrid bonds issued | 2 |  |  |  | 2 |  |  |  |  |  |  |
Notional amount of bonds issued during period | € 2,000,000,000 | € 3,000,000,000 |  |  | € 2,000,000,000 |  |  |  |  |  |  |
Equity credit assigned (as a percent) | 50.00% |  |  |  |  |  |  |  |  |  |  |
Sustainability-linked bond |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of bonds issued during period |  |  |  |  | 1,000,000,000 |  |  |  |  |  |  |
Project relating to Dogger Bank (C) |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Capital commitments |  |  |  |  | € 262,000,000 |  |  |  |  |  |  |
Equity interest acquired (as a percent) |  |  |  |  | 20.00% |  | 20.00% |  |  |  |  |
Spain and Greece renewable energy project |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Capital commitments |  |  |  |  | € 250,000,000 |  |  |  |  |  |  |
Alleged illegal handling of waste material |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Fine payable |  |  |  |  |  |  |  |  | € 700,000 |  |  |
Contextual confiscation amount |  |  |  |  |  |  |  |  | € 44,248,071 |  |  |
Environmental claim relating to Municipality of Cengio |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Claim amount |  |  |  |  | € 250,000,000 |  |  |  |  |  |  |
Block OPL 245 Nigeria |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Claim amount | $ |  |  |  |  |  |  | $ 1,092 |  |  |  |  |
Estimated fair value of the asset | $ |  |  |  |  |  |  | $ 3,500 |  |  |  |  |
Interest in assets (as a percent) |  |  |  |  | 50.00% |  |  |  |  |  |  |
Congo proceedings |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Sanction agreed |  |  |  |  |  |  |  | € 11,800,000 |  |  |  |
Derivatives |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Gross amount of financial assets and liabilities subject to offsetting |  |  |  |  | € 7,159,000,000 | 1,033,000,000 |  |  |  |  |  |
Eni Abu Dhabi Refining & Trading BV |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Capital commitments |  |  |  |  | € 3,532,000,000 | 3,260,000,000 |  |  |  |  |  |
Eni Abu Dhabi Refining & Trading BV | ADNOC Refining |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Equity interest acquired (as a percent) |  |  |  |  | 20.00% |  | 20.00% |  |  |  |  |
Trans Tunisian Pipeline Company SpA and Transmediterranean Pipeline Co Ltd |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Capital commitments |  |  |  |  | € 385,000,000 |  |  |  |  |  |  |
Equity interest to be transferred |  |  |  |  | 49.90% |  |  |  |  |  |  |
Eni Trading Shipping Inc |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Gross amount of financial assets and liabilities subject to offsetting |  |  |  |  | € 71,000,000 | 2,000,000 |  |  |  |  |  |
Eni Rewind SpA and Versalis SpA | Porto Torres dock damage |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Claim amount |  |  |  |  |  |  |  |  |  |  |  | € 1,500,000,000
Eni Rewind SpA | Alleged environmental damage caused by DDT pollution in Lake Maggiore |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Litigation damages annulled by the court |  |  | € 1,833,500,000 |  |  |  |  |  |  |  |  |
Estimated damage value |  |  | € 7,000,000 |  |  |  |  |  |  |  |  |
Number of years required to monitor natural recovery |  |  | 20 years |  |  |  |  |  |  |  |  |
Estimated compensatory work |  |  |  |  |  |  |  |  |  |  | € 9,500,000 |
Exploration & Production |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Gross amount of financial assets and liabilities subject to offsetting |  |  |  |  | 1,540,000,000 | 753,000,000 |  |  |  |  |  |
Uncommitted short-term borrowing facilities |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Undrawn borrowing facilities |  |  |  |  | 6,207,000,000 | 7,183,000,000 |  |  |  |  |  |
Committed borrowing facilities |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Undrawn borrowing facilities |  |  |  |  | 2,835,000,000 | 5,295,000,000 |  |  |  |  |  |
Commited credit lines |  |  |  |  | 5,114,000,000 |  |  |  |  |  |  |
Committed borrowing facilities | Over 12 months |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Undrawn borrowing facilities |  |  |  |  | 2,820,000,000 | 4,750,000,000 |  |  |  |  |  |
Euro Medium Term Notes |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount issuable |  |  |  |  | 20,000,000,000 |  |  |  |  |  |  |
Notional amount |  |  |  |  | 16,400,000,000 |  |  |  |  |  |  |
Risk associated with contractual assurances to acquirers |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Risks |  |  |  |  | 246,000,000 | 230,000,000 |  |  |  |  |  |
Value of assets of third parties under custody |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Risks |  |  |  |  | € 688,000,000 | 370,000,000 |  |  |  |  |  |
Currency |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Period of possible future changes in market values monitored |  |  |  |  | 1 day |  |  |  |  |  |  |
Percentage of confidence level |  |  |  |  | 99.00% |  |  |  |  |  |  |
Holding period |  |  |  |  | 20 days |  |  |  |  |  |  |
Interest rate risk |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Percentage of confidence level |  |  |  |  | 99.00% |  |  |  |  |  |  |
Holding period |  |  |  |  | 20 days |  |  |  |  |  |  |
Commodity price risk |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Percentage of confidence level |  |  |  |  | 95.00% |  |  |  |  |  |  |
Holding period |  |  |  |  | 1 day |  |  |  |  |  |  |
Strategic liquidity risk |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Percentage of confidence level |  |  |  |  | 99.00% |  |  |  |  |  |  |
Holding period |  |  |  |  | 1 day |  |  |  |  |  |  |
Period of medium and long-term financial debts for which coverage must be provided |  |  |  |  | 24 months |  |  |  |  |  |  |
Hydrocarbon exploration and production activities |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Capital commitments |  |  |  |  | € 70,039,000,000 | € 64,294,000,000 |  |  |  |  |  |
Increase (decrease) in capital commitments |  |  |  |  | € 5,745,000,000 |  |  |  |  |  |  |
Angola LNG Supply Services Llc |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest in project |  |  |  |  | 13.60% |  |  |  |  |  |  |
Cardon IV SA |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in joint venture |  |  |  |  | 50.00% |  |  |  |  |  |  |
Proportion of voting rights held in joint venture |  |  |  |  | 50.00% | 50.00% |  |  |  |  |  |
Contractual volumes of gas amount |  |  |  |  | € 11,000,000,000 |  |  |  |  |  |  |
Saipem SpA |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in joint venture |  |  |  |  | 30.54% |  |  |  |  |  |  |
Proportion of voting rights held in joint venture |  |  |  |  | 31.20% | 31.08% |  |  |  |  |  |
Expected capital increase |  |  |  | € 2,000,000,000 |  |  |  |  |  |  |  |
Eni USA Gas Marketing Llc | Angola LNG Supply Services Llc |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Capital commitments |  |  |  |  |  | € 1,672,000,000 |  |  |  |  |  |
Partners of unincorporated joint operations |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Lease liabilities |  |  |  |  | € 2,370,000,000 | 2,429,000,000 |  |  |  |  |  |
ENI SpA | Committed borrowing facilities |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Commited credit lines |  |  |  |  | 5,000,000,000 |  |  |  |  |  |  |
ENI SpA | Euro Medium Term Notes |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | 14,100,000,000 |  |  |  |  |  |  |
ENI SpA | Saipem SpA |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Expected capital increase |  |  |  | € 610,000,000 |  |  |  |  |  |  |  |
EniPower SpA |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Capital commitments |  |  |  |  | 99,000,000 |  |  |  |  |  |  |
Coral FLNG SA | Third parties |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Maximum financial guarantee given by the company |  |  |  |  | € 1,324,000,000 |  |  |  |  |  |  |
Percentage of obligation covered by guarantee |  |  |  |  | 100.00% |  |  |  |  |  |  |
Consolidated subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Guarantee for bid bonds and performance bonds |  |  |  |  | € 3,601,000,000 | 3,209,000,000 |  |  |  |  |  |
Underlying commitment |  |  |  |  | 6,267,000,000 | 4,520,000,000 |  |  |  |  |  |
Guarantees |  |  |  |  | 6,432,000,000 | 4,758,000,000 |  |  |  |  |  |
Consolidated subsidiaries | Exploration & Production |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Independent gurantee contract amount |  |  |  |  | 943,000,000 |  |  |  |  |  |  |
Consolidated subsidiaries | Third parties |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Independent gurantee contract amount |  |  |  |  | 913,000,000 |  |  |  |  |  |  |
Investments in unconsolidated entities controlled by Eni |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Guarantees |  |  |  |  | 190,000,000 | 176,000,000 |  |  |  |  |  |
Joint ventures and associates |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Guarantee for bid bonds and performance bonds |  |  |  |  | 1,764,000,000 | 1,544,000,000 |  |  |  |  |  |
Underlying commitment |  |  |  |  | 1,816,000,000 | 1,898,000,000 |  |  |  |  |  |
Guarantees |  |  |  |  | 3,358,000,000 | 3,800,000,000 |  |  |  |  |  |
Joint ventures and associates | Unsecured and other guarantees |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Bank guarantee |  |  |  |  | 1,413,000,000 | 1,533,000,000 |  |  |  |  |  |
Joint ventures and associates | Rete Ferroviaria Italiana SpA |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Guarantees |  |  |  |  |  | 499,000,000 |  |  |  |  |  |
Joint ventures and associates | Gulf LNG Energy and Gulf LNG Pipeline |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Guarantees |  |  |  |  | 179,000,000 | 165,000,000 |  |  |  |  |  |
Joint ventures and associates | Coral FLNG SA |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Guarantee for bid bonds and performance bonds |  |  |  |  | 1,260,000,000 | 1,079,000,000 |  |  |  |  |  |
Joint ventures and associates | Coral FLNG SA | Unsecured and other guarantees |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Bank guarantee |  |  |  |  |  | 1,304,000,000 |  |  |  |  |  |
Others |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Underlying commitment |  |  |  |  | 124,000,000 | 87,000,000 |  |  |  |  |  |
Guarantees |  |  |  |  | 180,000,000 | 150,000,000 |  |  |  |  |  |
Others | State oil Company of Mozambique ENH |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |
Guarantees |  |  |  |  | € 157,000,000 | € 145,000,000 |  |  |  |  |  |

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