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Guarantees, commitments and risks - Additional information (Details) € in Thousands, t in Thousands, $ in Millions | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |
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Sep. 30, 2018 EUR (€) | Mar. 31, 2017 EUR (€) | Jul. 31, 2009 EUR (€) | Dec. 31, 2019 USD ($) t | Dec. 31, 2019 EUR (€) t | Dec. 31, 2018 EUR (€) t | Dec. 31, 2019 EUR (€) | Jul. 31, 2019 EUR (€) | Jul. 24, 2019 EUR (€) | Jun. 24, 2019 EUR (€) | Apr. 30, 2018 EUR (€) | Dec. 31, 2017 EUR (€) | Dec. 31, 2012 EUR (€)
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees |  |  |  |  |  | € 9,497,000 | € 8,862,000 |  |  |  |  |  |
Capital commitments |  |  |  |  |  |  | 16,448,000 |  |  |  |  |  |
Investment agreed |  |  |  |  |  | 116,000 | 114,000 |  |  |  |  |  |
Risks |  |  |  |  |  | € 673,000 | 676,000 |  |  |  |  |  |
Bonds issued |  |  |  |  | € 1,635,000 |  |  |  |  |  |  |  |
Lease liabilities |  |  |  |  |  |  | 5,648,000 |  |  |  |  |  |
Quantity of total emission of carbon dioxide | t |  |  |  | 19,300 | 19,300 |  |  |  |  |  |  |  |
Quantity of free emission allowance of carbon dioxide | t |  |  |  | 7,730 | 7,730 | 7,730 |  |  |  |  |  |  |
Deficit quantity of emission allowance of carbon dioxide | t |  |  |  | 11,570 | 11,570 |  |  |  |  |  |  |  |
Evolvere SpA |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Capital commitments |  |  |  |  |  |  | € 105,000 |  |  |  |  |  |
Equity interest acquired (as a percent) |  |  |  | 70.00% |  |  | 70.00% |  |  |  |  |  |
Environmental claim relating to Municipality of Cengio |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Claim amount |  |  |  |  |  |  | € 250,000 |  |  |  |  |  |
Block OPL 245 Nigeria |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Claim amount | $ |  |  |  | $ 1,092 |  |  |  |  |  |  |  |  |
Disgorgement of profit | € 100,000 |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair value of the asset | $ |  |  |  | $ 3,500 |  |  |  |  |  |  |  |  |
Interest in assets (as a percent) |  |  |  | 50.00% | 50.00% |  |  |  |  |  |  |  |
Criminal proceedings on fuel excise tax |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Claim amount |  |  |  |  |  |  |  |  |  |  | € 22,000 |  |
Excise tax determined |  |  |  |  |  |  |  |  |  | € 73 |  |  |
Objection against claim, amount |  |  |  |  |  |  |  |  |  |  | € 34,000 |  |
Excise tax payables |  |  |  |  |  |  |  | € 8,000 |  |  |  |  |
Estimated other related taxes |  |  |  |  |  |  |  | € 6,000 |  |  |  |  |
Arbitration with GasTerra |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Alleged receivable due by company |  |  |  |  |  |  | 1,010,000 |  |  |  |  |  |
Bank guarantee terminated |  |  |  |  |  |  |  |  | € 1,010,000 |  |  |  |
Omitted payment of property tax for oil offshore platforms located in territorial waters |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Claim amount |  |  |  |  |  |  | 19,000 |  |  |  |  |  |
Provisions |  |  |  |  |  |  | 17,000 |  |  |  |  |  |
Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Gross amount of financial assets and liabilities subject to offsetting |  |  |  |  |  | € 1,636,000 | 612,000 |  |  |  |  |  |
Eni Abu Dhabi Refining & Trading BV |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Capital commitments |  |  |  |  |  |  | 6,527,000 |  |  |  |  |  |
Guarantee for obligations under Share Purchase Agreement |  |  |  |  |  |  | 2,965,000 |  |  |  |  |  |
Guarantee for obligations under Shareholders Agreement |  |  |  |  |  |  | € 3,562,000 |  |  |  |  |  |
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 |  |  |  |  |  | 186,000 | € 187,000 |  |  |  |  |  |
Eni Rewind SpA and Versalis SpA | Porto Torres dock damage |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Claim amount |  |  |  |  |  |  |  |  |  |  |  |  | € 1,500,000
Eni Rewind SpA and Versalis SpA | Alleged environmental damage caused by illegal waste disposal in municipality of Melilli (Sicily) |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Claim amount |  |  |  |  |  |  | 500,000 |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |
Estimated damage value |  |  | € 7,000 |  |  |  |  |  |  |  |  |  |
Number of years required to monitor natural recovery |  |  | 20 years |  |  |  |  |  |  |  |  |  |
Estimated compensatory work |  | € 9,500 |  |  |  |  |  |  |  |  |  |  |
Exploration & Production |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Gross amount of financial assets and liabilities subject to offsetting |  |  |  |  |  | 1,347,000 | 713,000 |  |  |  |  |  |
within 1 year |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Capital commitments |  |  |  |  |  |  | 5,570,000 |  |  |  |  |  |
Euro Medium Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount issuable |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  |
Notional amount |  |  |  |  |  |  | 14,896,000 |  |  |  |  |  |
Bonds issued |  |  |  |  | € 746,000 |  |  |  |  |  |  |  |
Bonds issued on U.S. and international markets |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  |  |  | $ 1,000 | € 889,000 |  |  |  |  |  |  |  |
Short term debt |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Undrawn borrowing facilities |  |  |  |  |  |  | 13,299,000 |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Undrawn borrowing facilities |  |  |  |  |  |  | 4,667,000 |  |  |  |  |  |
Long-term debt | within 1 year |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Undrawn borrowing facilities |  |  |  |  |  |  | 450,000 |  |  |  |  |  |
Risk associated with contractual assurances to acquirers |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Risks |  |  |  |  |  | 244,000 | 248,000 |  |  |  |  |  |
Value of assets of third parties under custody |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Risks |  |  |  |  |  | 429,000 | 428,000 |  |  |  |  |  |
Currency |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Period of possible future changes in market values monitored |  |  |  | 1 day | 1 day |  |  |  |  |  |  |  |
Percentage of confidence level |  |  |  | 99.00% | 99.00% |  |  |  |  |  |  |  |
Holding period |  |  |  | 20 days | 20 days |  |  |  |  |  |  |  |
Interest rate risk |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of confidence level |  |  |  | 99.00% | 99.00% |  |  |  |  |  |  |  |
Holding period |  |  |  | 20 days | 20 days |  |  |  |  |  |  |  |
Commodity price risk |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of confidence level |  |  |  | 95.00% | 95.00% |  |  |  |  |  |  |  |
Holding period |  |  |  | 1 day | 1 day |  |  |  |  |  |  |  |
Strategic liquidity risk |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of confidence level |  |  |  | 99.00% | 99.00% |  |  |  |  |  |  |  |
Holding period |  |  |  | 1 day | 1 day |  |  |  |  |  |  |  |
Period of medium and long-term financial debts for which coverage must be provided |  |  |  | 24 months | 24 months |  |  |  |  |  |  |  |
Hydrocarbon exploration and production activities |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Capital commitments |  |  |  |  |  | 52,397,000 | 65,374,000 |  |  |  |  |  |
Increase (decrease) in capital commitments |  |  |  |  | € 12,977,000 |  |  |  |  |  |  |  |
Increase in other commitment |  |  |  |  | 9,794,000 |  |  |  |  |  |  |  |
Hydrocarbon exploration and production activities | Eni Abu Dhabi B V |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in other commitment |  |  |  |  | 8,904,000 |  |  |  |  |  |  |  |
Hydrocarbon exploration and production activities | Eni RAK BV |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in other commitment |  |  |  |  | 890,000 |  |  |  |  |  |  |  |
Hydrocarbon exploration and production activities | Mexico license agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Capital commitments |  |  |  |  |  | 9,194,000 |  |  |  |  |  |  |
Increase in other commitment |  |  |  |  | € 445,000 | 6,968,000 |  |  |  |  |  |  |
Regasified gas at Pascagoula plant |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Capital commitments |  |  |  |  |  | € 2,079,000 | 1,978,000 |  |  |  |  |  |
Var Energi AS |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in joint venture |  |  |  | 69.60% | 69.60% | 69.60% |  |  |  |  |  |  |
Var Energi AS | Hydrocarbon exploration and production activities |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in other commitment |  |  |  |  | € 1,781,000 |  |  |  |  |  |  |  |
Saipem SpA |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in joint venture |  |  |  | 30.54% | 30.54% |  |  |  |  |  |  |  |
Angola LNG Supply Services Llc |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest in project |  |  |  | 13.60% | 13.60% |  |  |  |  |  |  |  |
Cardon IV SA |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in joint venture |  |  |  | 50.00% | 50.00% |  |  |  |  |  |  |  |
Contractual volumes of gas amount |  |  |  |  | € 13,000,000 |  |  |  |  |  |  |  |
Umm Shaif and Nasr and Lower Zakum |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Capital commitments |  |  |  |  |  |  | 13,356,000 |  |  |  |  |  |
Number of years of commitment |  |  |  | 40 years | 40 years |  |  |  |  |  |  |  |
Lower Zakum |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest in project |  |  |  | 5.00% | 5.00% |  |  |  |  |  |  |  |
Umm Shaif and Nasr |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest in project |  |  |  | 10.00% | 10.00% |  |  |  |  |  |  |  |
Gasha |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest in project |  |  |  | 25.00% | 25.00% |  |  |  |  |  |  |  |
Capital commitments |  |  |  |  |  |  | 22,261,000 |  |  |  |  |  |
Number of years of commitment |  |  |  | 40 years | 40 years |  |  |  |  |  |  |  |
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 |
Supply commitments compensation recognized |  |  |  |  | € 324,000 |  |  |  |  |  |  |  |
Claim for regasification fees |  |  |  |  |  |  | 757,000 |  |  |  |  |  |
Partners of unincorporated joint ventures |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Lease liabilities |  |  |  |  |  |  | 2,953,000 |  |  |  |  |  |
Coral FLNG SA |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in joint operation |  |  |  | 25.00% | 25.00% |  |  |  |  |  |  |  |
Maximum financial guarantee given by the company |  |  |  |  |  |  | 1,168,000 |  |  |  |  |  |
Percentage of contract guaranteed |  |  |  | 25.00% | 25.00% |  |  |  |  |  |  |  |
Project financing amount |  |  |  |  | € 4,164,000 |  |  |  |  |  |  |  |
Maximum amount of debt service undertaking |  |  |  |  |  |  | 1,425,000 |  |  |  |  |  |
Share of capital expenditure |  |  |  |  |  |  | 123,000 |  |  |  |  |  |
Share of debt undertaking |  |  |  |  |  |  | 158,000 |  |  |  |  |  |
Coral FLNG SA | Third parties |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum financial guarantee given by the company |  |  |  |  |  |  | 1,335,000 |  |  |  |  |  |
Coral FLNG SA | CNPC |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in special purpose entity |  |  |  | 20.00% | 20.00% |  |  |  |  |  |  |  |
Coral FLNG SA | Exxonmobil |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in special purpose entity |  |  |  | 25.00% | 25.00% |  |  |  |  |  |  |  |
Mozambique Rovuma Venture SpA |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in joint operation |  |  |  | 35.71% | 35.71% |  |  |  |  |  |  |  |
LNG Floating Production unit |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Contract value |  |  |  |  |  |  | 4,673,000 |  |  |  |  |  |
Percentage of interest in project |  |  |  | 25.00% | 25.00% |  |  |  |  |  |  |  |
Amount of LNG to be treated | t |  |  |  | 3,370 | 3,370 |  |  |  |  |  |  |  |
Consolidated subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees |  |  |  |  |  | € 5,082,000 | 4,323,000 |  |  |  |  |  |
Guarantee for bid bonds and performance bonds |  |  |  |  |  | 2,576,000 | 2,886,000 |  |  |  |  |  |
Underlying commitment |  |  |  |  |  | 5,000,000 | 4,013,000 |  |  |  |  |  |
Consolidated subsidiaries | Gas Terra |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in guarantee for bid bonds and performance bonds |  |  |  |  | € (1,010,000) |  |  |  |  |  |  |  |
Investments in unconsolidated entities controlled by Eni |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees |  |  |  |  |  | 196,000 | 197,000 |  |  |  |  |  |
Joint ventures and associates |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees |  |  |  |  |  | 4,056,000 | 4,075,000 |  |  |  |  |  |
Guarantee for bid bonds and performance bonds |  |  |  |  |  | 1,644,000 | 1,661,000 |  |  |  |  |  |
Underlying commitment |  |  |  |  |  | 2,159,000 | 2,109,000 |  |  |  |  |  |
Joint ventures and associates | Unsecured and other guarantees |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Bank guarantee |  |  |  |  |  | 1,664,000 | 1,676,000 |  |  |  |  |  |
Joint ventures and associates | Rete Ferroviaria Italiana SpA |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees |  |  |  |  |  | 499,000 | 499,000 |  |  |  |  |  |
Joint ventures and associates | Gulf LNG Energy and Gulf LNG Pipeline |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees |  |  |  |  |  | 177,000 | 181,000 |  |  |  |  |  |
Joint ventures and associates | Coral FLNG SA |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantee for bid bonds and performance bonds |  |  |  |  |  | 1,147,000 | 1,168,000 |  |  |  |  |  |
Joint ventures and associates | Coral FLNG SA | Unsecured and other guarantees |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Bank guarantee |  |  |  |  |  | 1,397,000 | 1,425,000 |  |  |  |  |  |
Others |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees, commitments and risks |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantees |  |  |  |  |  | € 163,000 | € 267,000 |  |  |  |  |  |

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