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Guarantees, commitments and risks - Additional information (Details) t in Thousands | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2020 EUR (€) instrument | Apr. 30, 2020 USD ($) | Jul. 31, 2009 EUR (€) | Jul. 31, 2008 EUR (€) | Dec. 31, 2020 EUR (€) t instrument | Dec. 31, 2018 t | Mar. 15, 2021 EUR (€) | Mar. 10, 2021 EUR (€) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 EUR (€) | Dec. 31, 2019 EUR (€) | Dec. 31, 2017 EUR (€) | Mar. 31, 2017 EUR (€) | May 31, 2014 EUR (€) | Dec. 31, 2012 EUR (€)
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees |  |  |  |  |  |  |  |  |  | € 8,884,000,000 | € 8,862,000,000 |  |  |  |
Capital commitments |  |  |  |  |  |  |  |  |  | 14,675,000,000 |  |  |  |  |
Investment agreed |  |  |  |  |  |  |  |  |  | 108,000,000 | 114,000,000 |  |  |  |
Risks |  |  |  |  |  |  |  |  |  | 600,000,000 | 676,000,000 |  |  |  |
Period over which the management deems the liquidity reserves retained are enough to meet the financial obligations |  |  |  |  | 18 months |  |  |  |  |  |  |  |  |  |
Lease liabilities |  |  |  |  |  |  |  |  |  | 5,018,000,000 | 5,648,000,000 |  |  |  |
Quantity of total emission of carbon dioxide | t |  |  |  |  | 17,320 |  |  |  |  |  |  |  |  |  |
Quantity of free emission allowance of carbon dioxide | t |  |  |  |  | 6,840 | 6,840 |  |  |  |  |  |  |  |  |
Deficit quantity of emission allowance of carbon dioxide | t |  |  |  |  | 10,480 |  |  |  |  |  |  |  |  |  |
Perpetual subordinated bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | € 3,000,000,000 |  |  |  |  |  |  |  |  | € 3,000,000 |  |  |  |  |
Number of euro-denominated perpetual subordinated hybrid bonds issued | instrument | 2 |  |  |  | 2 |  |  |  |  |  |  |  |  |  |
Equity credit assigned (as a percent) | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Evolvere |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest acquired (as a percent) |  |  |  |  |  |  |  |  | 70.00% | 70.00% |  |  |  |  |
Project relating to Dogger Bank (A and B) wind facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital commitments |  |  |  |  |  |  |  |  |  | € 451,000,000 |  |  |  |  |
Equity interest acquired (as a percent) |  |  |  |  |  |  |  |  | 20.00% | 20.00% |  |  |  |  |
Finproject SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital commitments |  |  |  |  |  |  |  |  |  | € 150,000,000 |  |  |  |  |
Equity interest acquired (as a percent) |  |  |  |  |  |  |  |  | 60.00% | 60.00% |  |  |  |  |
Alleged illegal handling of waste material | Outcome of preliminary hearings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | $ |  |  |  |  |  |  |  |  | $ 1,092,000,000 |  |  |  |  |  |
Estimated fair value of the asset | $ |  |  |  |  |  |  |  |  | $ 3,500,000,000 |  |  |  |  |  |
Interest in assets (as a percent) |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |
Congo proceedings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sanction agreed |  |  |  |  |  |  | € 11,800,000 |  |  |  |  |  |  |  |
Allegation of corruption relating to the award of certain contracts to Eni's former subsidiary Saipem in Algeria |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement amount representing Eni's part of tax benefits obtained by Saipem in relation to the costs incurred by Saipem | $ |  | $ 19,750,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Sum of compensation for interest | $ |  | $ 4,750,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Alleged environmental damage caused by illegal waste disposal in municipality of Melilli (Sicily) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Claim amount |  |  |  |  |  |  |  |  |  |  |  |  |  | € 500,000,000 |
Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross amount of financial assets and liabilities subject to offsetting |  |  |  |  |  |  |  |  |  | 1,033,000,000 | 612,000,000 |  |  |  |
Eni Abu Dhabi Refining & Trading BV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital commitments |  |  |  |  |  |  |  |  |  | 3,260,000,000 | 6,527,000,000 |  |  |  |
Increase (decrease) in capital commitments |  |  |  |  | € (3,267,000,000) |  |  |  |  |  |  |  |  |  |
Guarantee for obligations under Share Purchase Agreement |  |  |  |  |  |  |  |  |  | € 73,000,000 |  |  |  |  |
Eni Abu Dhabi Refining & Trading BV | ADNOC Refining |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest acquired (as a percent) |  |  |  |  |  |  |  |  | 20.00% | 20.00% |  |  |  |  |
Eni Trading Shipping Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross amount of financial assets and liabilities subject to offsetting |  |  |  |  |  |  |  |  |  | € 2,000,000 | 187,000,000 |  |  |  |
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 |  |  |  |  |  |  |  |  |  | 753,000,000 | 713,000,000 |  |  |  |
Uncommitted short-term borrowing facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Undrawn borrowing facilities |  |  |  |  |  |  |  |  |  | 7,183,000,000 | 13,299,000,000 |  |  |  |
Committed borrowing facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Undrawn borrowing facilities |  |  |  |  |  |  |  |  |  | 5,295,000,000 | 4,667,000,000 |  |  |  |
Committed borrowing facilities | Over 12 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Undrawn borrowing facilities |  |  |  |  |  |  |  |  |  | 4,750,000,000 | 4,217,000,000 |  |  |  |
Euro Medium Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount issuable |  |  |  |  |  |  |  |  |  | 20,000,000,000 |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  | 16,257,000,000 |  |  |  |  |
Bonds issued |  |  |  |  | € 3,500,000,000 |  |  |  |  |  |  |  |  |  |
Risk associated with contractual assurances to acquirers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risks |  |  |  |  |  |  |  |  |  | 230,000,000 | 248,000,000 |  |  |  |
Value of assets of third parties under custody |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risks |  |  |  |  |  |  |  |  |  | 370,000,000 | 428,000,000 |  |  |  |
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 |  |  |  |  |  |  |  |  |  | 64,294,000,000 | 65,374,000,000 |  |  |  |
Increase (decrease) in capital commitments |  |  |  |  | € (1,080,000,000) |  |  |  |  |  |  |  |  |  |
Regasified gas at Pascagoula plant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital commitments |  |  |  |  |  |  |  |  |  | 1,672,000,000 | 1,978,000,000 |  |  |  |
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% |  |  |  |  |  |  |  |  |  |
Contractual volumes of gas amount |  |  |  |  | € 12,000,000,000 |  |  |  |  |  |  |  |  |  |
Eni USA Gas Marketing Llc and Gulf LNG Energy Llc GLE and Gulf LNG Pipeline Llc GLP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term supply commitments |  |  |  |  |  |  |  |  |  |  |  | € 948,000,000 |  |  |
Supply commitments compensation recognized |  |  |  |  | 324,000,000 |  |  |  |  |  |  |  |  |  |
Claim for regasification fees |  |  |  |  |  |  |  |  |  | 757,000,000 |  |  |  |  |
Partners of unincorporated joint ventures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease liabilities |  |  |  |  |  |  |  |  |  | 2,429,000,000 | 2,953,000,000 |  |  |  |
ENI SpA | Euro Medium Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  | 13,900,000,000 |  |  |  |  |
Bonds issued |  |  |  |  | € 3,000,000,000 |  |  |  |  |  |  |  |  |  |
Coral FLNG SA | Third parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum financial guarantee given by the company |  |  |  |  |  |  |  |  |  | 1,223,000,000 |  |  |  |  |
Percentage of obligation covered by guarantee |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |
Consolidated subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees |  |  |  |  |  |  |  |  |  | 4,758,000,000 | 4,323,000,000 |  |  |  |
Guarantee for bid bonds and performance bonds |  |  |  |  |  |  |  |  |  | 3,209,000,000 | 2,886,000,000 |  |  |  |
Underlying commitment |  |  |  |  |  |  |  |  |  | 4,520,000,000 | 4,013,000,000 |  |  |  |
Investments in unconsolidated entities controlled by Eni |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees |  |  |  |  |  |  |  |  |  | 176,000,000 | 197,000,000 |  |  |  |
Joint ventures and associates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees |  |  |  |  |  |  |  |  |  | 3,800,000,000 | 4,075,000,000 |  |  |  |
Guarantee for bid bonds and performance bonds |  |  |  |  |  |  |  |  |  | 1,544,000,000 | 1,661,000,000 |  |  |  |
Underlying commitment |  |  |  |  |  |  |  |  |  | 1,898,000,000 | 2,109,000,000 |  |  |  |
Joint ventures and associates | Unsecured and other guarantees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bank guarantee |  |  |  |  |  |  |  |  |  | 1,533,000,000 | 1,676,000,000 |  |  |  |
Joint ventures and associates | Rete Ferroviaria Italiana SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees |  |  |  |  |  |  |  |  |  | 499,000,000 | 499,000,000 |  |  |  |
Joint ventures and associates | Gulf LNG Energy and Gulf LNG Pipeline |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees |  |  |  |  |  |  |  |  |  | 165,000,000 | 181,000,000 |  |  |  |
Joint ventures and associates | Coral FLNG SA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantee for bid bonds and performance bonds |  |  |  |  |  |  |  |  |  | 1,079,000,000 | 1,168,000,000 |  |  |  |
Joint ventures and associates | Coral FLNG SA | Unsecured and other guarantees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bank guarantee |  |  |  |  |  |  |  |  |  | 1,304,000,000 | 1,425,000,000 |  |  |  |
Others |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees |  |  |  |  |  |  |  |  |  | 150,000,000 | 267,000,000 |  |  |  |
Underlying commitment |  |  |  |  |  |  |  |  |  | 87,000,000 | 80,000,000 |  |  |  |
Others | State oil Company of Mozambique ENH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees |  |  |  |  |  |  |  |  |  | € 145,000,000 | € 158,000,000 |  |  |  |

X
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