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Other information about investments - Other significant investments - Refining & Marketing and Chemical & Corporate and other activities (Details) | 12 Months Ended |  |
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Dec. 31, 2020 GHS (GH₵) | Dec. 31, 2020 CHF (SFr) | Dec. 31, 2020 GBP (£) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 EUR (€) | Dec. 31, 2019 EUR (€)
Other significant investments |  |  |  |  |  |
Share capital |  |  |  |  | € 4,005,000,000 | € 4,005,000,000
ENI SpA |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
Share capital |  |  |  |  | 4,005,358,876 | € 4,005,358,876
Refining & Marketing | Italy | Other significant investments One [member] |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
Company name | Società Italiana Oleodotti di Gaeta SpA |  |  |  |  |
Registered office | Rome |  |  |  |  |
Country of operation | Italy |  |  |  |  |
Share capital |  |  |  |  | 360,000,000 |
Consolidation or valuation method | F.V. |  |  |  |  |
Refining & Marketing | Italy | Other significant investments One [member] | Third parties |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
% Ownership | 27.52% |  |  |  |  |
Refining & Marketing | Italy | Other significant investments One [member] | ENI SpA |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
% Ownership | 72.48% |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Two [Member] |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
Company name | BFS Berlin Fuelling Services GbR |  |  |  |  |
Registered office | Hamburg (Germany) |  |  |  |  |
Country of operation | Germany |  |  |  |  |
Share capital |  |  |  |  | 89,199 |
Consolidation or valuation method | F.V. |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Two [Member] | Eni Deutsch.GmbH [Member] |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
% Ownership | 12.50% |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Two [Member] | Third parties |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
% Ownership | 87.50% |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Three [Member] |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
Company name | Compania de Economia Mixta ‘Austrogas' |  |  |  |  |
Registered office | Cuenca (Ecuador) |  |  |  |  |
Country of operation | Ecuador |  |  |  |  |
Share capital | $ |  |  |  | $ 5,665,329 |  |
Consolidation or valuation method | F.V. |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Three [Member] | Third parties |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
% Ownership | 86.62% |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Three [Member] | Eni Ecuador SA [Member] |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
% Ownership | 13.38% |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Four [Member] |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
Company name | Dépôt Pétrolier de Fos SA |  |  |  |  |
Registered office | Fos-Sur-Mer (France) |  |  |  |  |
Country of operation | France |  |  |  |  |
Share capital |  |  |  |  | 3,954,196.40 |
Consolidation or valuation method | F.V. |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Four [Member] | Third parties |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
% Ownership | 83.19% |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Four [Member] | Eni France Sarl [Member] |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
% Ownership | 16.81% |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Five [Member] |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
Company name | Dépôt Pétrolier de la Côte d'Azur SAS |  |  |  |  |
Registered office | Nanterre (France) |  |  |  |  |
Country of operation | France |  |  |  |  |
Share capital |  |  |  |  | 207,500 |
Consolidation or valuation method | F.V. |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Five [Member] | Third parties |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
% Ownership | 82.00% |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Five [Member] | Eni France Sarl [Member] |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
% Ownership | 18.00% |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Six [Member] |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
Company name | Joint Inspection Group Ltd |  |  |  |  |
Registered office | London (United Kingdom) |  |  |  |  |
Country of operation | United Kingdom |  |  |  |  |
Share capital | £ |  |  | £ 0 |  |  |
Consolidation or valuation method | F.V. |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Six [Member] | Third parties |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
% Ownership | 87.50% |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Six [Member] | ENI SpA |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
% Ownership | 12.50% |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Seven [Member] |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
Company name | Saudi European Petrochemical Co "IBN ZAHR" |  |  |  |  |
Registered office | Al Jubail (Saudi Arabia) |  |  |  |  |
Country of operation | Saudi Arabia |  |  |  |  |
Share capital | $ |  |  |  | $ 1,200,000,000 |  |
Consolidation or valuation method | F.V. |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Seven [Member] | Third parties |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
% Ownership | 90.00% |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Seven [Member] | Ecofuel SpA [Member] |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
% Ownership | 10.00% |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Eight [Member] |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
Company name | S.I.P.G. Société Immobilière Pétrolière de Gestion Snc |  |  |  |  |
Registered office | Tremblay-En-France (France) |  |  |  |  |
Country of operation | France |  |  |  |  |
Share capital |  |  |  |  | 40,000 |
Consolidation or valuation method | F.V. |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Eight [Member] | Third parties |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
% Ownership | 87.50% |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Eight [Member] | Eni France Sarl [Member] |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
% Ownership | 12.50% |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Nine [Member] |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
Company name | Sistema Integrado de Gestion de Aceites Usados |  |  |  |  |
Registered office | Madrid (Spain) |  |  |  |  |
Country of operation | Spain |  |  |  |  |
Share capital |  |  |  |  | 175,713 |
Consolidation or valuation method | F.V. |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Nine [Member] | Third parties |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
% Ownership | 84.56% |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Nine [Member] | Eni Iberia SLU [Member] |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
% Ownership | 15.44% |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Ten [Member] |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
Company name | Tanklager - Gesellschaft Tegel (TGT) GbR |  |  |  |  |
Registered office | Hamburg (Germany) |  |  |  |  |
Country of operation | Germany |  |  |  |  |
Share capital |  |  |  |  | 4,953 |
Consolidation or valuation method | F.V. |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Ten [Member] | Eni Deutsch.GmbH [Member] |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
% Ownership | 12.50% |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Ten [Member] | Third parties |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
% Ownership | 87.50% |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Eleven [Member] |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
Company name | TAR - Tankanlage Ruemlang AG |  |  |  |  |
Registered office | Ruemlang (Switzerland) |  |  |  |  |
Country of operation | Switzerland |  |  |  |  |
Share capital | SFr |  | SFr 3,259,500 |  |  |  |
Consolidation or valuation method | F.V. |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Eleven [Member] | Third parties |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
% Ownership | 83.73% |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Eleven [Member] | Eni Suisse SA [Member] |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
% Ownership | 16.27% |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Twelve [Member] |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
Company name | Tema Lube Oil Co Ltd |  |  |  |  |
Registered office | Accra (Ghana) |  |  |  |  |
Country of operation | Ghana |  |  |  |  |
Share capital | GH₵ | GH₵ 258,309 |  |  |  |  |
Consolidation or valuation method | F.V. |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Twelve [Member] | Third parties |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
% Ownership | 88.00% |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Twelve [Member] | Eni International BV |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
% Ownership | 12.00% |  |  |  |  |
Chemicals | Italy | Other Significant Investments Thirteen [Member] |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
Company name | Novamont SpA |  |  |  |  |
Registered office | Novara |  |  |  |  |
Country of operation | Italy |  |  |  |  |
Share capital |  |  |  |  | 13,333,500 |
Consolidation or valuation method | F.V. |  |  |  |  |
Chemicals | Italy | Other Significant Investments Thirteen [Member] | Third parties |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
% Ownership | 75.00% |  |  |  |  |
Chemicals | Italy | Other Significant Investments Thirteen [Member] | Versalis SpA [Member] |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
% Ownership | 25.00% |  |  |  |  |
Other activities | Italy | Other significant investments One [member] |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
Company name | Ottana Sviluppo ScpA (in bankruptcy) |  |  |  |  |
Registered office | Nuoro |  |  |  |  |
Country of operation | Italy |  |  |  |  |
Share capital |  |  |  |  | € 516,000 |
Consolidation or valuation method | F.V. |  |  |  |  |
Other activities | Italy | Other significant investments One [member] | Third parties |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
% Ownership | 70.00% |  |  |  |  |
Other activities | Italy | Other significant investments One [member] | Eni Rewind SpA [Member] |  |  |  |  |  |
Other significant investments |  |  |  |  |  |
% Ownership | 30.00% |  |  |  |  |

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