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Other information about investments (Details 6) | 12 Months Ended |  |
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Dec. 31, 2017 EUR (€) | Dec. 31, 2017 GBP (£) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 EGP (ج.م.) | 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] | Corporate and financial companies [Member] | Subsidiaries One [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name |  | Agenzia Giornalistica Italia SpA |  |  |  |  |
Registered office |  | Rome |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |
Share capital |  | € 2,000,000 |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |
Italy [Member] | Corporate and financial companies [Member] | Subsidiaries Two [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name |  | Eni Adfin SpA |  |  |  |  |
Registered office |  | Rome |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |
Share capital |  | € 85,537,498.8 |  |  |  |  |
% Equity ratio |  | 99.67% |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |
Italy [Member] | Corporate and financial companies [Member] | Subsidiaries Two [Member] | Eni SpA [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |
% Ownership |  | 99.67% |  |  |  |  |
Italy [Member] | Corporate and financial companies [Member] | Subsidiaries Two [Member] | Third parties [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |
% Ownership |  | 0.33% |  |  |  |  |
Italy [Member] | Corporate and financial companies [Member] | Subsidiaries Three [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name |  | Eni Corporate University SpA |  |  |  |  |
Registered office |  | San Donato Milanese (MI) |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |
Share capital |  | € 3,360,000 |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |
Italy [Member] | Corporate and financial companies [Member] | Subsidiaries Four [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name |  | EniServizi SpA |  |  |  |  |
Registered office |  | San Donato Milanese (MI) |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |
Share capital |  | € 13,427,419.08 |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |
Italy [Member] | Corporate and financial companies [Member] | Subsidiaries Five [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name |  | Serfactoring SpA |  |  |  |  |
Registered office |  | San Donato Milanese (MI) |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |
Share capital |  | € 5,160,000 |  |  |  |  |
% Equity ratio |  | 49.00% |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |
Italy [Member] | Corporate and financial companies [Member] | Subsidiaries Five [Member] | Eni SpA [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |
% Ownership |  | 49.00% |  |  |  |  |
Italy [Member] | Corporate and financial companies [Member] | Subsidiaries Five [Member] | Third parties [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |
% Ownership |  | 51.00% |  |  |  |  |
Italy [Member] | Corporate and financial companies [Member] | Subsidiaries Six [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name |  | Servizi Aerei SpA |  |  |  |  |
Registered office |  | San Donato Milanese (MI) |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |
Share capital |  | € 79,817,238 |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |
Italy [Member] | Other Activities [Member] | Subsidiaries One [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name |  | Anic Partecipazioni SpA (in liquidation) |  |  |  |  |
Registered office |  | Gela (CL) |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |
Share capital |  | € 23,519,847.16 |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |
Italy [Member] | Other Activities [Member] | Subsidiaries One [Member] | Third parties [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |
% Ownership |  | 0.03% |  |  |  |  |
Italy [Member] | Other Activities [Member] | Subsidiaries One [Member] | Syndial SpA [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Syndial SpA |  |  |  |  |
% Ownership |  | 99.97% |  |  |  |  |
Italy [Member] | Other Activities [Member] | Subsidiaries Two [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name |  | Eni Energia Srl |  |  |  |  |
Registered office |  | San Donato Milanese (MI) |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |
Share capital |  | € 10,000 |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |
Consolidation or valutation method | [1] | Co. |  |  |  |  |
Italy [Member] | Other Activities [Member] | Subsidiaries Three [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name |  | Eni New Energy SpA |  |  |  |  |
Registered office |  | San Donato Milanese (MI) |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |
Share capital |  | € 5,000,000 |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |
Italy [Member] | Other Activities [Member] | Subsidiaries Four [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name |  | Industria Siciliana Acido Fosforico - ISAF - SpA (in liquidation) |  |  |  |  |
Registered office |  | Gela (CL) |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |
Share capital |  | € 1,300,000 |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |
Italy [Member] | Other Activities [Member] | Subsidiaries Four [Member] | Third parties [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |
% Ownership |  | 48.00% |  |  |  |  |
Italy [Member] | Other Activities [Member] | Subsidiaries Four [Member] | Syndial SpA [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Syndial SpA |  |  |  |  |
% Ownership |  | 52.00% |  |  |  |  |
Italy [Member] | Other Activities [Member] | Subsidiaries Five [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name |  | Ing. Luigi Conti Vecchi SpA |  |  |  |  |
Registered office |  | Assemini (CA) |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |
Share capital |  | € 5,518,620.64 |  |  |  |  |
Shareholders |  | Syndial SpA |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |
Italy [Member] | Other Activities [Member] | Subsidiaries Six [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name |  | Syndial Servizi Ambientali SpA |  |  |  |  |
Registered office |  | San Donato Milanese (MI) |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |
Share capital |  | € 424,818,703.05 |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |
Italy [Member] | Other Activities [Member] | Subsidiaries Six [Member] | Eni SpA [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |
% Ownership |  | 99.99% |  |  |  |  |
Italy [Member] | Other Activities [Member] | Subsidiaries Six [Member] | Third parties [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |
% Ownership |  | 0.01% |  |  |  |  |
Outside Italy [Member] | Corporate and financial companies [Member] | Subsidiaries One [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name |  | Banque Eni SA |  |  |  |  |
Registered office |  | Bruxelles (Belgium) |  |  |  |  |
Country of operation |  | Belgium |  |  |  |  |
Share capital |  | € 50,000,000 |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |
Outside Italy [Member] | Corporate and financial companies [Member] | Subsidiaries One [Member] | Eni International BV [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |  |
% Ownership |  | 99.90% |  |  |  |  |
Outside Italy [Member] | Corporate and financial companies [Member] | Subsidiaries One [Member] | Eni Oil Holdings BV [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Eni Oil Holdings BV |  |  |  |  |
% Ownership |  | 0.10% |  |  |  |  |
Outside Italy [Member] | Corporate and financial companies [Member] | Subsidiaries Two [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name |  | Eni Finance International SA |  |  |  |  |
Registered office |  | Bruxelles (Belgium) |  |  |  |  |
Country of operation |  | Belgium |  |  |  |  |
Share capital | $ |  |  |  | $ 2,474,225,632 |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |
Outside Italy [Member] | Corporate and financial companies [Member] | Subsidiaries Two [Member] | Eni SpA [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |
% Ownership |  | 33.61% |  |  |  |  |
Outside Italy [Member] | Corporate and financial companies [Member] | Subsidiaries Two [Member] | Eni International BV [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |  |
% Ownership |  | 66.39% |  |  |  |  |
Outside Italy [Member] | Corporate and financial companies [Member] | Subsidiaries Three [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name |  | Eni Finance USA Inc |  |  |  |  |
Registered office |  | Dover, Delaware (USA) |  |  |  |  |
Country of operation |  | USA |  |  |  |  |
Share capital | $ |  |  |  | $ 15,000,000 |  |  |
Shareholders |  | Eni Petroleum Co Inc |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |
Outside Italy [Member] | Corporate and financial companies [Member] | Subsidiaries Four [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name |  | Eni Insurance Designated Activity Company |  |  |  |  |
Registered office |  | Dublin (Ireland) |  |  |  |  |
Country of operation |  | Ireland |  |  |  |  |
Share capital |  | € 500,000,000 |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |
Outside Italy [Member] | Corporate and financial companies [Member] | Subsidiaries Five [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name |  | Eni International BV |  |  |  |  |
Registered office |  | Amsterdam (Netherlands) |  |  |  |  |
Country of operation |  | Netherlands |  |  |  |  |
Share capital |  | € 641,683,425 |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |
Outside Italy [Member] | Corporate and financial companies [Member] | Subsidiaries Six [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name |  | Eni International Resources Ltd |  |  |  |  |
Registered office |  | London (United Kingdom) |  |  |  |  |
Country of operation |  | United Kingdom |  |  |  |  |
Share capital | £ |  |  | £ 50,000 |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |
Outside Italy [Member] | Corporate and financial companies [Member] | Subsidiaries Six [Member] | Eni SpA [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |
% Ownership |  | 99.99% |  |  |  |  |
Outside Italy [Member] | Corporate and financial companies [Member] | Subsidiaries Six [Member] | Eni UK Ltd [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Eni UK Ltd |  |  |  |  |
% Ownership |  | 0.01% |  |  |  |  |
Outside Italy [Member] | Other Activities [Member] | Subsidiaries One [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
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 valutation method | [1] | Eq. |  |  |  |  |
Outside Italy [Member] | Other Activities [Member] | Subsidiaries One [Member] | Eni International BV [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |  |
% Ownership |  | 99.98% |  |  |  |  |
Outside Italy [Member] | Other Activities [Member] | Subsidiaries One [Member] | Ieoc Exploration BV [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Ieoc Exploration BV |  |  |  |  |
% Ownership |  | 0.01% |  |  |  |  |
Outside Italy [Member] | Other Activities [Member] | Subsidiaries One [Member] | Ieoc Production BV [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Ieoc Production BV |  |  |  |  |
% Ownership |  | 0.01% |  |  |  |  |
Outside Italy [Member] | Other Activities [Member] | Subsidiaries Two [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name |  | Oleodotto del Reno SA |  |  |  |  |
Registered office |  | Coira (Switzerland) |  |  |  |  |
Country of operation |  | Switzerland |  |  |  |  |
Share capital | SFr |  |  |  |  |  | SFr 1,550,000 |
Shareholders |  | Syndial SpA |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |
[1] | Jointly controlled entity.

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