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Other information about investments - Subsidiaries - Eni gas e luce, Power, Renewables (Details) | 12 Months Ended |  |
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Dec. 31, 2020 PKR (₨) | Dec. 31, 2020 KZT (₸) | Dec. 31, 2020 GBP (£) | Dec. 31, 2020 EGP (ج.م.) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 EUR (€) | Dec. 31, 2019 EUR (€)
Subsidiaries |  |  |  |  |  |  |
Share capital |  |  |  |  |  | € 4,005,000,000 | € 4,005,000,000
ENI SpA |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
Share capital |  |  |  |  |  | 4,005,358,876 | € 4,005,358,876
Eni gas e luce | Italy | Subsidiaries One [Member] |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
Company name | Eni gas e luce SpA |  |  |  |  |  |
Registered office | San Donato Milanese (MI) |  |  |  |  |  |
Country of operation | Italy |  |  |  |  |  |
Share capital |  |  |  |  |  | 750,000,000 |
% Equity ratio | 100.00% |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |
Eni gas e luce | Italy | Subsidiaries One [Member] | ENI SpA |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |
Eni gas e luce | Italy | Subsidiaries Two [Member] |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
Company name | Evolvere Smart Srl |  |  |  |  |  |
Registered office | Milan |  |  |  |  |  |
Country of operation | Italy |  |  |  |  |  |
Share capital |  |  |  |  |  | 100,000 |
% Equity ratio | 70.52% |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |
Eni gas e luce | Italy | Subsidiaries Two [Member] | Evolvere Venture Spa [Member] |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |
Eni gas e luce | Italy | Subsidiaries Three [Member] |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
Company name | Evolvere SpA Società Benefit |  |  |  |  |  |
Registered office | Milan |  |  |  |  |  |
Country of operation | Italy |  |  |  |  |  |
Share capital |  |  |  |  |  | 1,130,000 |
% Equity ratio | 70.52% |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |
Eni gas e luce | Italy | Subsidiaries Three [Member] | Eni gas e luce SPA |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
% Ownership | 70.52% |  |  |  |  |  |
Eni gas e luce | Italy | Subsidiaries Three [Member] | Third parties |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
% Ownership | 29.48% |  |  |  |  |  |
Eni gas e luce | Italy | Subsidiaries Four [Member] |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
Company name | Evolvere Venture SpA |  |  |  |  |  |
Registered office | Milan |  |  |  |  |  |
Country of operation | Italy |  |  |  |  |  |
Share capital |  |  |  |  |  | 50,000 |
% Equity ratio | 70.52% |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |
Eni gas e luce | Italy | Subsidiaries Four [Member] | Evolvere SpA Soc Ben [Member] |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |
Eni gas e luce | Italy | Subsidiaries Five [Member] |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
Company name | SEA SpA |  |  |  |  |  |
Registered office | L'Aquila |  |  |  |  |  |
Country of operation | Italy |  |  |  |  |  |
Share capital |  |  |  |  |  | 100,000 |
% Equity ratio | 60.00% |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |
Eni gas e luce | Italy | Subsidiaries Five [Member] | Eni gas e luce SPA |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
% Ownership | 60.00% |  |  |  |  |  |
Eni gas e luce | Italy | Subsidiaries Five [Member] | Third parties |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
% Ownership | 40.00% |  |  |  |  |  |
Eni gas e luce | Foreign (outside Italy) | Subsidiaries Six [Member] |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
Company name | Adriaplin Podjetje za distribucijo zemeljskega plina doo Ljubljana |  |  |  |  |  |
Registered office | Ljubljana (Slovenia) |  |  |  |  |  |
Country of operation | Slovenia |  |  |  |  |  |
Share capital |  |  |  |  |  | 12,956,935 |
% Equity ratio | 51.00% |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |
Eni gas e luce | Foreign (outside Italy) | Subsidiaries Six [Member] | Eni gas e luce SPA |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
% Ownership | 51.00% |  |  |  |  |  |
Eni gas e luce | Foreign (outside Italy) | Subsidiaries Six [Member] | Third parties |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
% Ownership | 49.00% |  |  |  |  |  |
Eni gas e luce | Foreign (outside Italy) | Subsidiaries Seven [Member] |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
Company name | Eni Gas & Power France SA |  |  |  |  |  |
Registered office | Levallois Perret (France) |  |  |  |  |  |
Country of operation | France |  |  |  |  |  |
Share capital |  |  |  |  |  | 29,937,600 |
% Equity ratio | 99.87% |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |
Eni gas e luce | Foreign (outside Italy) | Subsidiaries Seven [Member] | Eni gas e luce SPA |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
% Ownership | 99.87% |  |  |  |  |  |
Eni gas e luce | Foreign (outside Italy) | Subsidiaries Seven [Member] | Third parties |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
% Ownership | 0.13% |  |  |  |  |  |
Eni gas e luce | Foreign (outside Italy) | Subsidiaries Eight [Member] |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
Company name | Gas Supply Company Thessaloniki - Thessalia SA |  |  |  |  |  |
Registered office | Thessaloniki (Greece) |  |  |  |  |  |
Country of operation | Greece |  |  |  |  |  |
Share capital |  |  |  |  |  | 13,761,788 |
% Equity ratio | 100.00% |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |
Eni gas e luce | Foreign (outside Italy) | Subsidiaries Eight [Member] | Eni gas e luce SPA |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |
Power | Italy | Subsidiaries Nine [Member] |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
Company name | EniPower Mantova SpA |  |  |  |  |  |
Registered office | San Donato Milanese (MI) |  |  |  |  |  |
Country of operation | Italy |  |  |  |  |  |
Share capital |  |  |  |  |  | 144,000,000 |
% Equity ratio | 86.50% |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |
Power | Italy | Subsidiaries Nine [Member] | Third parties |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
% Ownership | 13.50% |  |  |  |  |  |
Power | Italy | Subsidiaries Nine [Member] | EniPower SpA |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
% Ownership | 86.50% |  |  |  |  |  |
Power | Italy | Subsidiaries Ten [Member] |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
Company name | EniPower SpA |  |  |  |  |  |
Registered office | San Donato Milanese (MI) |  |  |  |  |  |
Country of operation | Italy |  |  |  |  |  |
Share capital |  |  |  |  |  | 944,947,849 |
% Equity ratio | 100.00% |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |
Power | Italy | Subsidiaries Ten [Member] | ENI SpA |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |
Renewables | Italy | Subsidiaries Eleven [Member] |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
Company name | CGDB Enrico Srl |  |  |  |  |  |
Registered office | San Donato Milanese (MI) |  |  |  |  |  |
Country of operation | Italy |  |  |  |  |  |
Share capital |  |  |  |  |  | 10,000 |
% Equity ratio | 100.00% |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |
Renewables | Italy | Subsidiaries Eleven [Member] | Eni New Energy SpA [Member] |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |
Renewables | Italy | Subsidiaries Twelve [Member] |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
Company name | CGDB Laerte Srl |  |  |  |  |  |
Registered office | San Donato Milanese (MI) |  |  |  |  |  |
Country of operation | Italy |  |  |  |  |  |
Share capital |  |  |  |  |  | 10,000 |
% Equity ratio | 100.00% |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |
Renewables | Italy | Subsidiaries Twelve [Member] | Eni New Energy SpA [Member] |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |
Renewables | Italy | Subsidiaries Thirteen [Member] |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
Company name | Eni New Energy SpA |  |  |  |  |  |
Registered office | San Donato Milanese (MI) |  |  |  |  |  |
Country of operation | Italy |  |  |  |  |  |
Share capital |  |  |  |  |  | 9,296,000 |
% Equity ratio | 100.00% |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |
Renewables | Italy | Subsidiaries Thirteen [Member] | ENI SpA |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |
Renewables | Italy | Subsidiaries Fourteen [Member] |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
Company name | Wind Park Laterza Srl |  |  |  |  |  |
Registered office | San Donato Milanese (MI) |  |  |  |  |  |
Country of operation | Italy |  |  |  |  |  |
Share capital |  |  |  |  |  | 10,000 |
% Equity ratio | 100.00% |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |
Renewables | Italy | Subsidiaries Fourteen [Member] | Eni New Energy SpA [Member] |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |
Renewables | Foreign (outside Italy) | Subsidiaries Fifteen [Member] |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
Company name | Arm Wind Llp |  |  |  |  |  |
Registered office | Nur-Sultan (Kazakhstan) |  |  |  |  |  |
Country of operation | Kazakhstan |  |  |  |  |  |
Share capital | ₸ |  | ₸ 7,963,200,000 |  |  |  |  |
% Equity ratio | 100.00% |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |
Renewables | Foreign (outside Italy) | Subsidiaries Fifteen [Member] | Eni Energy Solutions BV [Member] |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |
Renewables | Foreign (outside Italy) | Subsidiaries Sixteen [Member] |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
Company name | Eni Energy Solutions BV |  |  |  |  |  |
Registered office | Amsterdam (Netherlands) |  |  |  |  |  |
Country of operation | Netherlands |  |  |  |  |  |
Share capital |  |  |  |  |  | € 20,000 |
% Equity ratio | 100.00% |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |
Renewables | Foreign (outside Italy) | Subsidiaries Sixteen [Member] | Eni International BV |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |
Renewables | Foreign (outside Italy) | Subsidiaries Seventeen [Member] |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
Company name | Eni New Energy Egypt SAE |  |  |  |  |  |
Registered office | Cairo (Egypt) |  |  |  |  |  |
Country of operation | Egypt |  |  |  |  |  |
Share capital | ج.م. |  |  |  | ج.م. 250,000 |  |  |
Consolidation or valuation method | Eq. |  |  |  |  |  |
Renewables | Foreign (outside Italy) | Subsidiaries Seventeen [Member] | Eni International BV |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
% Ownership | 99.98% |  |  |  |  |  |
Renewables | Foreign (outside Italy) | Subsidiaries Seventeen [Member] | Ieoc Exploration BV [Member] |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
% Ownership | 0.01% |  |  |  |  |  |
Renewables | Foreign (outside Italy) | Subsidiaries Seventeen [Member] | Ieoc Production BV |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
% Ownership | 0.01% |  |  |  |  |  |
Renewables | Foreign (outside Italy) | Subsidiaries Eighteen [Member] |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
Company name | Eni New Energy Pakistan (Private) Ltd |  |  |  |  |  |
Registered office | Saddar Town-Karachi (Pakistan) |  |  |  |  |  |
Country of operation | Pakistan |  |  |  |  |  |
Share capital | ₨ | ₨ 136,000,000 |  |  |  |  |  |
% Equity ratio | 100.00% |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |
Renewables | Foreign (outside Italy) | Subsidiaries Eighteen [Member] | Eni International BV |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
% Ownership | 99.98% |  |  |  |  |  |
Renewables | Foreign (outside Italy) | Subsidiaries Eighteen [Member] | Eni Oil Holdings BV |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
% Ownership | 0.01% |  |  |  |  |  |
Renewables | Foreign (outside Italy) | Subsidiaries Eighteen [Member] | Eni Pakistan Ltd (M) [Member] |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
% Ownership | 0.01% |  |  |  |  |  |
Renewables | Foreign (outside Italy) | Subsidiaries Nineteen [Member] |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
Company name | Eni New Energy US Inc |  |  |  |  |  |
Registered office | Dover (USA) |  |  |  |  |  |
Country of operation | USA |  |  |  |  |  |
Share capital | $ |  |  |  |  | $ 100 |  |
% Equity ratio | 100.00% |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |
Renewables | Foreign (outside Italy) | Subsidiaries Nineteen [Member] | Eni Petroleum Co Inc |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |
Renewables | Foreign (outside Italy) | Subsidiaries Twenty [Member] |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
Company name | Eni North Sea Wind Ltd |  |  |  |  |  |
Registered office | London (United Kingdom) |  |  |  |  |  |
Country of operation | United Kingdom |  |  |  |  |  |
Share capital | £ |  |  | £ 10,000 |  |  |  |
Consolidation or valuation method | Eq. |  |  |  |  |  |
Renewables | Foreign (outside Italy) | Subsidiaries Twenty [Member] | Eni Energy Solutions BV [Member] |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |

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