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Other information about investments (Details 10) | 12 Months Ended |  |
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Dec. 31, 2018 EUR (€) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 GBP (£) | Dec. 31, 2018 SAR (ر.س) | Dec. 31, 2018 CHF (SFr) | Dec. 31, 2018 GHS (GH₵) | Dec. 31, 2017 EUR (€)
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Share capital |  | € 4,005,000,000 |  |  |  |  |  | € 4,005,000,000
In Italy [Member] | Subsidiaries One [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Share capital |  | € 36,149 |  |  |  |  |  |
In Italy [Member] | Subsidiaries One [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Company name |  | Consorzio Nazionale per la Gestione Raccolta e Trattamento degli Oli Minerali Usati |  |  |  |  |  |
Registered office |  | Rome |  |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |  |
Consolidation or valutation method | [1] | F.V. |  |  |  |  |  |
In Italy [Member] | Subsidiaries One [Member] | ENI SPAs [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Name of Shareholders |  | Eni SpA |  |  |  |  |  |
% Ownership |  | 12.43% |  |  |  |  |  |
In Italy [Member] | Subsidiaries One [Member] | Third parties [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |  |
% Ownership |  | 87.57% |  |  |  |  |  |
In Italy [Member] | Subsidiaries Two [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Share capital |  | € 360,000,000 |  |  |  |  |  |
In Italy [Member] | Subsidiaries Two [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Company name | [2] | Societa Italiana Oleodotti di Gaeta SpA |  |  |  |  |  |
Registered office |  | Rome |  |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |  |
Consolidation or valutation method | [1] | F.V. |  |  |  |  |  |
In Italy [Member] | Subsidiaries Two [Member] | ENI SPAs [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Name of Shareholders |  | Eni SpA |  |  |  |  |  |
% Ownership |  | 72.48% |  |  |  |  |  |
In Italy [Member] | Subsidiaries Two [Member] | Third parties [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |  |
% Ownership |  | 27.52% |  |  |  |  |  |
Outside Italy [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Company name |  | Tema Lube Oil Co Ltd |  |  |  |  |  |
Consolidation or valutation method | [1] | F.V. |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries One [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Share capital |  | € 89.199 |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries One [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Company name |  | BFS Berlin Fuelling Services GbR |  |  |  |  |  |
Registered office |  | Hamburg (Germany) |  |  |  |  |  |
Country of operation |  | Germany |  |  |  |  |  |
Consolidation or valutation method | [1] | F.V. |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries One [Member] | Third parties [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |  |
% Ownership |  | 87.50% |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries One [Member] | Eni Deutsch GmbH [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Name of Shareholders |  | Eni Deutsch.GmbH |  |  |  |  |  |
% Ownership |  | 12.50% |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries Two [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Share capital | $ |  |  | $ 3,028,749 |  |  |  |  |
Outside Italy [Member] | Subsidiaries Two [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Company name |  | Compania de Economia Mixta ‘Austrogas’ |  |  |  |  |  |
Registered office |  | Cuenca (Ecuador) |  |  |  |  |  |
Country of operation |  | Ecuador |  |  |  |  |  |
Consolidation or valutation method | [1] | F.V. |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries Two [Member] | Third parties [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |  |
% Ownership |  | 86.69% |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries Two [Member] | Eni Ecuador SA [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Name of Shareholders |  | Eni Ecuador SA |  |  |  |  |  |
% Ownership |  | 13.31% |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries Three [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Share capital |  | € 3,954,196.40 |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries Three [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Company name |  | Dépôt Pétrolier de Fos SA |  |  |  |  |  |
Registered office |  | Fos-Sur-Mer (France) |  |  |  |  |  |
Country of operation |  | France |  |  |  |  |  |
Consolidation or valutation method | [1] | F.V. |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries Three [Member] | Third parties [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |  |
% Ownership |  | 83.19% |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries Three [Member] | Eni France Sarl [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Name of Shareholders |  | Eni France Sàrl |  |  |  |  |  |
% Ownership |  | 16.81% |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries Four [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Share capital |  | € 207,500 |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries Four [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Company name |  | Dépôt Pétrolier de la Côte d’Azur SAS |  |  |  |  |  |
Registered office |  | Nanterre (France) |  |  |  |  |  |
Country of operation |  | France |  |  |  |  |  |
Consolidation or valutation method | [1] | F.V. |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries Four [Member] | Third parties [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |  |
% Ownership |  | 82.00% |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries Four [Member] | Eni France Sarl [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Name of Shareholders |  | Eni France Sàrl |  |  |  |  |  |
% Ownership |  | 18.00% |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries Five [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Company name |  | Joint Inspection Group Ltd |  |  |  |  |  |
Registered office |  | London (United Kingdom) |  |  |  |  |  |
Country of operation |  | United Kingdom |  |  |  |  |  |
Share capital | £ | [3] |  |  | £ 0 |  |  |  |
Consolidation or valutation method | [1] | F.V. |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries Five [Member] | ENI SPAs [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Name of Shareholders |  | Eni SpA |  |  |  |  |  |
% Ownership |  | 12.50% |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries Five [Member] | Third parties [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |  |
% Ownership |  | 87.50% |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries Six [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Share capital | ر.س |  |  |  |  | ر.س 1,200,000,000 |  |  |
Outside Italy [Member] | Subsidiaries Six [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Company name |  | Saudi European Petrochemical Company 'IBN ZAHR' |  |  |  |  |  |
Registered office |  | Al Jubail (Saudi Arabia) |  |  |  |  |  |
Country of operation |  | Saudi Arabia |  |  |  |  |  |
Consolidation or valutation method | [1] | F.V. |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries Six [Member] | Third parties [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |  |
% Ownership |  | 90.00% |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries Six [Member] | Ecofuel SpA [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Name of Shareholders |  | Ecofuel SpA |  |  |  |  |  |
% Ownership |  | 10.00% |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries Seven [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Share capital |  | € 40,000 |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries Seven [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Company name |  | S.I.P.G. Société Immobilier Pétrolier de Gestion Snc |  |  |  |  |  |
Registered office |  | Tremblay-En-France (France) |  |  |  |  |  |
Country of operation |  | France |  |  |  |  |  |
Consolidation or valutation method | [1] | F.V. |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries Seven [Member] | Third parties [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |  |
% Ownership |  | 87.50% |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries Seven [Member] | Eni France Sarl [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Name of Shareholders |  | Eni France Sàrl |  |  |  |  |  |
% Ownership |  | 12.50% |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries Eight [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Share capital |  | € 175,713 |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries Eight [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Company name |  | Sistema Integrado de Gestion de Aceites Usados |  |  |  |  |  |
Registered office |  | Madrid (Spain) |  |  |  |  |  |
Country of operation |  | Spain |  |  |  |  |  |
Consolidation or valutation method | [1] | F.V. |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries Eight [Member] | Third parties [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |  |
% Ownership |  | 84.56% |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries Eight [Member] | Eni Iberia SLU [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Name of Shareholders |  | Eni Iberia SLU |  |  |  |  |  |
% Ownership |  | 15.44% |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries Nine [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Share capital |  | € 4.953 |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries Nine [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Company name |  | Tanklager - Gesellschaft Tegel (TGT) GbR |  |  |  |  |  |
Registered office |  | Hamburg (Germany) |  |  |  |  |  |
Country of operation |  | Germany |  |  |  |  |  |
Consolidation or valutation method | [1] | F.V. |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries Nine [Member] | Third parties [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |  |
% Ownership |  | 87.50% |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries Nine [Member] | Eni Deutsch GmbH [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Name of Shareholders |  | Eni Deutsch.GmbH |  |  |  |  |  |
% Ownership |  | 12.50% |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries Ten [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Share capital | SFr |  |  |  |  |  | SFr 3,259,500 |  |
Outside Italy [Member] | Subsidiaries Ten [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Company name |  | TAR - Tankanlage Ruemlang AG |  |  |  |  |  |
Registered office |  | Ruemlang (Switzerland) |  |  |  |  |  |
Country of operation |  | Switzerland |  |  |  |  |  |
Consolidation or valutation method | [1] | F.V. |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries Ten [Member] | Third parties [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |  |
% Ownership |  | 83.73% |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries Ten [Member] | Eni Suisse SA [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Name of Shareholders |  | Eni Suisse SA |  |  |  |  |  |
% Ownership |  | 16.27% |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries Eleven [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Registered office |  | Accra (Ghana) |  |  |  |  |  |
Country of operation |  | Ghana |  |  |  |  |  |
Share capital | GH₵ |  |  |  |  |  |  | GH₵ 258,309 |
Outside Italy [Member] | Subsidiaries Eleven [Member] | Third parties [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |  |
% Ownership |  | 88.00% |  |  |  |  |  |
Outside Italy [Member] | Subsidiaries Eleven [Member] | Eni International BV [Member] | Italy [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Name of Shareholders |  | Eni International BV |  |  |  |  |  |
% Ownership |  | 12.00% |  |  |  |  |  |
[1] | F.C. = full consolidation, J.O. = joint operation, Eq. = equity-accounted, Co. = valued at cost, F.V. = valued at fair value
[2] | ​The item related to the increase in provisions for contingencies that are shown at present value in non-current liabilities.
[3] | Shares without nominal value.

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