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Other information about investments (Details 14) | 12 Months Ended |  |
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Dec. 31, 2017 EUR (€) | Dec. 31, 2017 GBP (£) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 GHS (GH₵) | Dec. 31, 2017 CHF (SFr) | Dec. 31, 2016 EUR (€)
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Share capital |  | € 4,005,000,000 |  |  |  |  | € 4,005,000,000
Italy [Member] | Italy [Member] | Subsidiaries One [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name |  | Consorzio Nazionale per la Gestione Raccolta e Trattamento degli Oli Minerali Usati (former Consorzio Obbligatorio degli Oli Usati) |  |  |  |  |
Registered office |  | Rome |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |
Share capital |  | € 36,149 |  |  |  |  |
Method used to account for investments in subsidiaries | [1] | Co. |  |  |  |  |
Italy [Member] | Italy [Member] | Subsidiaries One [Member] | Eni SpA [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Name of Shareholders |  | Eni SpA |  |  |  |  |
% Ownership |  | 12.43% |  |  |  |  |
Italy [Member] | Italy [Member] | Subsidiaries One [Member] | Third parties [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |
% Ownership |  | 87.57% |  |  |  |  |
Italy [Member] | Italy [Member] | Subsidiaries Two [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name | [2] | Società Italiana Oleodotti di Gaeta SpA |  |  |  |  |
Registered office |  | Rome |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |
Share capital |  | € 360,000,000 |  |  |  |  |
Method used to account for investments in subsidiaries | [1] | Co. |  |  |  |  |
Italy [Member] | Italy [Member] | Subsidiaries Two [Member] | Eni SpA [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Name of Shareholders |  | Eni SpA |  |  |  |  |
% Ownership |  | 72.48% |  |  |  |  |
Italy [Member] | Italy [Member] | Subsidiaries Two [Member] | Third parties [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |
% Ownership |  | 27.52% |  |  |  |  |
Outside Italy [Member] | Italy [Member] | Subsidiaries One [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name |  | BFS Berlin Fuelling Services GbR |  |  |  |  |
Registered office |  | Hamburg (Germany) |  |  |  |  |
Country of operation |  | Germany |  |  |  |  |
Share capital |  | € 91,139 |  |  |  |  |
Method used to account for investments in subsidiaries | [1] | Co. |  |  |  |  |
Outside Italy [Member] | Italy [Member] | Subsidiaries One [Member] | Third parties [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |
% Ownership |  | 87.50% |  |  |  |  |
Outside Italy [Member] | Italy [Member] | Subsidiaries One [Member] | Eni Deutsch.GmbH [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Name of Shareholders |  | Eni Deutsch.GmbH |  |  |  |  |
% Ownership |  | 12.50% |  |  |  |  |
Outside Italy [Member] | Italy [Member] | Subsidiaries Two [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name |  | Compania de Economia Mixta ‘Austrogas’ |  |  |  |  |
Registered office |  | Cuenca (Ecuador) |  |  |  |  |
Country of operation |  | Ecuador |  |  |  |  |
Share capital | $ |  |  |  | $ 3,028,749 |  |  |
Method used to account for investments in subsidiaries | [1] | Co. |  |  |  |  |
Outside Italy [Member] | Italy [Member] | Subsidiaries Two [Member] | Third parties [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |
% Ownership |  | 86.69% |  |  |  |  |
Outside Italy [Member] | Italy [Member] | Subsidiaries Two [Member] | Eni Ecuador SA [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Name of Shareholders |  | Eni Ecuador SA |  |  |  |  |
% Ownership |  | 13.31% |  |  |  |  |
Outside Italy [Member] | Italy [Member] | Subsidiaries Three [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name |  | Dépôt Pétrolier de Fos SA |  |  |  |  |
Registered office |  | Fos-Sur-Mer (France) |  |  |  |  |
Country of operation |  | France |  |  |  |  |
Share capital |  | € 3,954,196 |  |  |  |  |
Method used to account for investments in subsidiaries | [1] | Co. |  |  |  |  |
Outside Italy [Member] | Italy [Member] | Subsidiaries Three [Member] | Third parties [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |
% Ownership |  | 83.19% |  |  |  |  |
Outside Italy [Member] | Italy [Member] | Subsidiaries Three [Member] | Eni France Sarl [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Name of Shareholders |  | Eni France Sàrl |  |  |  |  |
% Ownership |  | 16.81% |  |  |  |  |
Outside Italy [Member] | Italy [Member] | Subsidiaries Four [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name |  | Dépôt Pétrolier de la Côte d’Azur SAS |  |  |  |  |
Registered office |  | Nanterre (France) |  |  |  |  |
Country of operation |  | France |  |  |  |  |
Share capital |  | € 207,500 |  |  |  |  |
Method used to account for investments in subsidiaries | [1] | Co. |  |  |  |  |
Outside Italy [Member] | Italy [Member] | Subsidiaries Four [Member] | Third parties [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |
% Ownership |  | 82.00% |  |  |  |  |
Outside Italy [Member] | Italy [Member] | Subsidiaries Four [Member] | Eni France Sarl [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Name of Shareholders |  | Eni France Sàrl |  |  |  |  |
% Ownership |  | 18.00% |  |  |  |  |
Outside Italy [Member] | Italy [Member] | Subsidiaries Five [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 |  |  |  |
Method used to account for investments in subsidiaries | [1] | Co. |  |  |  |  |
Outside Italy [Member] | Italy [Member] | Subsidiaries Five [Member] | Eni SpA [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Name of Shareholders |  | Eni SpA |  |  |  |  |
% Ownership |  | 12.50% |  |  |  |  |
Outside Italy [Member] | Italy [Member] | Subsidiaries Five [Member] | Third parties [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |
% Ownership |  | 87.50% |  |  |  |  |
Outside Italy [Member] | Italy [Member] | Subsidiaries Six [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 |  |  |  |  |
Share capital |  | € 40,000 |  |  |  |  |
Method used to account for investments in subsidiaries | [1] | Co. |  |  |  |  |
Outside Italy [Member] | Italy [Member] | Subsidiaries Six [Member] | Third parties [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |
% Ownership |  | 87.50% |  |  |  |  |
Outside Italy [Member] | Italy [Member] | Subsidiaries Six [Member] | Eni France Sarl [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Name of Shareholders |  | Eni France Sàrl |  |  |  |  |
% Ownership |  | 12.50% |  |  |  |  |
Outside Italy [Member] | Italy [Member] | Subsidiaries Seven [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name |  | Sistema Integrado de Gestion de Aceites Usados |  |  |  |  |
Registered office |  | Madrid (Spain) |  |  |  |  |
Country of operation |  | Spain |  |  |  |  |
Share capital |  | € 175,713 |  |  |  |  |
Method used to account for investments in subsidiaries | [1] | Co. |  |  |  |  |
Outside Italy [Member] | Italy [Member] | Subsidiaries Seven [Member] | Third parties [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |
% Ownership |  | 84.56% |  |  |  |  |
Outside Italy [Member] | Italy [Member] | Subsidiaries Seven [Member] | Eni Iberia SLU [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Name of Shareholders |  | Eni Iberia SLU |  |  |  |  |
% Ownership |  | 15.44% |  |  |  |  |
Outside Italy [Member] | Italy [Member] | Subsidiaries Eight [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name |  | Tanklager - Gesellschaft Tegel (TGT) GbR |  |  |  |  |
Registered office |  | Hamburg (Germany) |  |  |  |  |
Country of operation |  | Germany |  |  |  |  |
Share capital |  | € 8,898 |  |  |  |  |
Method used to account for investments in subsidiaries | [1] | Co. |  |  |  |  |
Outside Italy [Member] | Italy [Member] | Subsidiaries Eight [Member] | Third parties [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |
% Ownership |  | 87.50% |  |  |  |  |
Outside Italy [Member] | Italy [Member] | Subsidiaries Eight [Member] | Eni Deutsch.GmbH [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Name of Shareholders |  | Eni Deutsch.GmbH |  |  |  |  |
% Ownership |  | 12.50% |  |  |  |  |
Outside Italy [Member] | Italy [Member] | Subsidiaries Nine [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name |  | TAR - Tankanlage Ruemlang AG |  |  |  |  |
Registered office |  | Ruemlang (Switzerland) |  |  |  |  |
Country of operation |  | Switzerland |  |  |  |  |
Share capital | SFr |  |  |  |  |  | SFr 3,259,500 |
Method used to account for investments in subsidiaries | [1] | Co. |  |  |  |  |
Outside Italy [Member] | Italy [Member] | Subsidiaries Nine [Member] | Third parties [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |
% Ownership |  | 83.73% |  |  |  |  |
Outside Italy [Member] | Italy [Member] | Subsidiaries Nine [Member] | Eni Suisse SA [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Name of Shareholders |  | Eni Suisse SA |  |  |  |  |
% Ownership |  | 16.27% |  |  |  |  |
Outside Italy [Member] | Italy [Member] | Subsidiaries Ten [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name |  | Tema Lube Oil Co Ltd |  |  |  |  |
Registered office |  | Accra (Ghana) |  |  |  |  |
Country of operation |  | Ghana |  |  |  |  |
Share capital | GH₵ |  |  |  |  | GH₵ 258,309 |  |
Method used to account for investments in subsidiaries | [1] | Co. |  |  |  |  |
Outside Italy [Member] | Italy [Member] | Subsidiaries Ten [Member] | Third parties [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |
% Ownership |  | 88.00% |  |  |  |  |
Outside Italy [Member] | Italy [Member] | Subsidiaries Ten [Member] | Eni International BV [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Name of Shareholders |  | Eni International BV |  |  |  |  |
% Ownership |  | 12.00% |  |  |  |  |
[1] | Jointly controlled entity.
[2] | Company under extraordinary administration procedure pursuant to law no. 95 of april 3, 1979. The liquidation was concluded on april 28, 2015. The cancellation has been filed and is pending the authorization by the Ministry of Economic Development.
[3] | Shares without nominal value.

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