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Other information about investments (Details 4) | 12 Months Ended |  |
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Dec. 31, 2017 EUR (€) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 RUB (₽) | 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] | Refining & Marketing [Member] | Subsidiaries One [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Company name |  | Consorzio AgipGas Sabina (in liquidation) |  |  |  |
Registered office |  | Cittaducale (RI) |  |  |  |
Country of operation |  | Italy |  |  |  |
Share capital |  | € 5,160 |  |  |  |
Shareholders |  | Eni Fuel SpA |  |  |  |
% Ownership |  | 100.00% |  |  |  |
Consolidation or valutation method | [1] | Co. |  |  |  |
Italy [Member] | Refining & Marketing [Member] | Subsidiaries Two [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Company name |  | Ecofuel SpA |  |  |  |
Registered office |  | San Donato Milanese (MI) |  |  |  |
Country of operation |  | Italy |  |  |  |
Share capital |  | € 52,000,000 |  |  |  |
Shareholders |  | Eni SpA |  |  |  |
% Ownership |  | 100.00% |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |
Italy [Member] | Refining & Marketing [Member] | Subsidiaries Three [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Company name |  | Eni Fuel SpA |  |  |  |
Registered office |  | Rome |  |  |  |
Country of operation |  | Italy |  |  |  |
Share capital |  | € 58,944,310 |  |  |  |
Shareholders |  | Eni SpA |  |  |  |
% Ownership |  | 100.00% |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |
Italy [Member] | Refining & Marketing [Member] | Subsidiaries Four [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Company name |  | Raffineria di Gela SpA |  |  |  |
Registered office |  | Gela (CL) |  |  |  |
Country of operation |  | Italy |  |  |  |
Share capital |  | € 15,000,000 |  |  |  |
Shareholders |  | Eni SpA |  |  |  |
% Ownership |  | 100.00% |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |
Italy [Member] | Refining & Marketing [Member] | Subsidiaries Five [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Company name |  | Servizi Fondo Bombole Metano SpA |  |  |  |
Registered office |  | Rome |  |  |  |
Country of operation |  | Italy |  |  |  |
Share capital |  | € 13,580,000.2 |  |  |  |
Shareholders |  | Eni SpA |  |  |  |
% Ownership |  | 100.00% |  |  |  |
Consolidation or valutation method | [1] | Co. |  |  |  |
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries One [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Company name |  | Eni Austria GmbH |  |  |  |
Registered office |  | Wien (Austria) |  |  |  |
Country of operation |  | Austria |  |  |  |
Share capital |  | € 78,500,000 |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries One [Member] | Eni International BV [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |
% Ownership |  | 75.00% |  |  |  |
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries One [Member] | Eni Deutsch.GmbH [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Shareholders |  | Eni Deutsch.GmbH |  |  |  |
% Ownership |  | 25.00% |  |  |  |
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Two [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Company name |  | Eni Benelux BV |  |  |  |
Registered office |  | Rotterdam (Netherlands) |  |  |  |
Country of operation |  | Netherlands |  |  |  |
Share capital |  | € 1,934,040 |  |  |  |
Shareholders |  | Eni International BV |  |  |  |
% Ownership |  | 100.00% |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Three [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Company name |  | Eni Deutschland GmbH |  |  |  |
Registered office |  | Munich (Germany) |  |  |  |
Country of operation |  | Germany |  |  |  |
Share capital |  | € 90,000,000 |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Three [Member] | Eni International BV [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |
% Ownership |  | 89.00% |  |  |  |
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Three [Member] | Eni Oil Holdings BV [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Shareholders |  | Eni Oil Holdings BV |  |  |  |
% Ownership |  | 11.00% |  |  |  |
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Four [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Company name |  | Eni Ecuador SA |  |  |  |
Registered office |  | Quito (Ecuador) |  |  |  |
Country of operation |  | Ecuador |  |  |  |
Share capital | $ |  |  | $ 103,142.08 |  |  |
% Equity ratio |  | 100.00% |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Four [Member] | Eni International BV [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |
% Ownership |  | 99.93% |  |  |  |
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Four [Member] | Eni International BV [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Shareholders |  | Esain SA |  |  |  |
% Ownership |  | 0.07% |  |  |  |
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Five [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Company name |  | Eni France Sàrl |  |  |  |
Registered office |  | Lyon (France) |  |  |  |
Country of operation |  | France |  |  |  |
Share capital |  | € 56,800,000 |  |  |  |
Shareholders |  | Eni International BV |  |  |  |
% Ownership |  | 100.00% |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Six [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Company name |  | Eni Iberia SLU |  |  |  |
Registered office |  | Alcobendas (Spain) |  |  |  |
Country of operation |  | Spain |  |  |  |
Share capital |  | € 17,299,100 |  |  |  |
Shareholders |  | Eni International BV |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Seven [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Company name |  | Eni Lubricants Trading (Shanghai) Co Ltd |  |  |  |
Registered office |  | Shanghai (China) |  |  |  |
Country of operation |  | China |  |  |  |
Share capital |  | € 5,000,000 |  |  |  |
Shareholders |  | Eni International BV |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Eight [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Company name |  | Eni Marketing Austria GmbH |  |  |  |
Registered office |  | Wien (Austria) |  |  |  |
Country of operation |  | Austria |  |  |  |
Share capital |  | € 19,621,665.23 |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Eight [Member] | Eni International BV [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |
% Ownership |  | 0.01% |  |  |  |
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Eight [Member] | Eni Mineralolh.GmbH [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Shareholders |  | Eni Mineralölh.GmbH |  |  |  |
% Ownership |  | 99.99% |  |  |  |
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Nine [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Company name |  | Eni Mineralölhandel GmbH |  |  |  |
Registered office |  | Wien (Austria) |  |  |  |
Country of operation |  | Austria |  |  |  |
Share capital |  | € 34,156,232.06 |  |  |  |
Shareholders |  | Eni Austria GmbH |  |  |  |
% Ownership |  | 100.00% |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Ten [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Company name |  | Eni Schmiertechnik GmbH |  |  |  |
Registered office |  | Wurzburg (Germany) |  |  |  |
Country of operation |  | Germany |  |  |  |
Share capital |  | € 2,000,000 |  |  |  |
Shareholders |  | Eni Deutsch.GmbH |  |  |  |
% Ownership |  | 100.00% |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Eleven [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Company name |  | Eni Suisse SA |  |  |  |
Registered office |  | Lausanne (Switzerland) |  |  |  |
Country of operation |  | Switzerland |  |  |  |
Share capital | SFr |  |  |  |  | SFr 102,500,000 |
Shareholders |  | Eni International BV |  |  |  |
% Ownership |  | 100.00% |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Twelve [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Company name |  | Eni USA R&M Co Inc |  |  |  |
Registered office |  | Wilmington (USA) |  |  |  |
Country of operation |  | USA |  |  |  |
Share capital | $ |  |  | 11,000,000 |  |  |
Shareholders |  | Eni International BV |  |  |  |
% Ownership |  | 100.00% |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Thirteen [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Company name |  | Esacontrol SA |  |  |  |
Registered office |  | Quito (Ecuador) |  |  |  |
Country of operation |  | Ecuador |  |  |  |
Share capital | $ |  |  | 60,000 |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Thirteen [Member] | Eni Ecuador SA [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Shareholders |  | Eni Ecuador SA |  |  |  |
% Ownership |  | 87.00% |  |  |  |
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Thirteen [Member] | Third parties [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |
% Ownership |  | 13.00% |  |  |  |
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Fourteen [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Company name |  | Esain SA |  |  |  |
Registered office |  | Quito (Ecuador) |  |  |  |
Country of operation |  | Ecuador |  |  |  |
Share capital | $ |  |  | 30,000 |  |  |
% Equity ratio |  | 100.00% |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Fourteen [Member] | Eni Ecuador SA [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Shareholders |  | Eni Ecuador SA |  |  |  |
% Ownership |  | 99.99% |  |  |  |
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Fourteen [Member] | Tecnoesa SA [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Shareholders |  | Tecnoesa SA |  |  |  |
% Ownership |  | 0.01% |  |  |  |
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Fifteen [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Company name |  | Oléoduc du Rhône SA |  |  |  |
Registered office |  | Valais (Switzerland) |  |  |  |
Country of operation |  | Switzerland |  |  |  |
Share capital | SFr |  |  |  |  | SFr 7,000,000 |
Shareholders |  | Eni International BV |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Sixteen [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Company name |  | OOO “Eni-Nefto” |  |  |  |
Registered office |  | Moscow (Russia) |  |  |  |
Country of operation |  | Russia |  |  |  |
Share capital | ₽ |  |  |  | ₽ 1,010,000 |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Sixteen [Member] | Eni International BV [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |
% Ownership |  | 99.01% |  |  |  |
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Sixteen [Member] | Eni Oil Holdings BV [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Shareholders |  | Eni Oil Holdings BV |  |  |  |
% Ownership |  | 0.99% |  |  |  |
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Seventeen [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Company name |  | Tecnoesa SA |  |  |  |
Registered office |  | Quito (Ecuador) |  |  |  |
Country of operation |  | Ecuador |  |  |  |
Share capital | $ |  |  | $ 36,000 |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Seventeen [Member] | Eni International BV [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Shareholders |  | Esain SA |  |  |  |
% Ownership |  | 0.01% |  |  |  |
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Seventeen [Member] | Eni Ecuador SA [Member] |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Shareholders |  | Eni Ecuador SA |  |  |  |
% Ownership |  | 99.99% |  |  |  |
[1] | Jointly controlled entity.

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