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Other information about investments (Details 3) | 12 Months Ended |  |
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Dec. 31, 2018 EUR (€) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 CHF (SFr) | Dec. 31, 2018 EGP (ج.م.) | Dec. 31, 2018 PKR (₨) | Dec. 31, 2018 KZT (₸) | Dec. 31, 2017 EUR (€)
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Share capital | € |  | € 4,005,000,000 |  |  |  |  |  | € 4,005,000,000
% Ownership |  | 80.00% |  |  |  |  |  |
Eni Oil Holdings BV [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
% Ownership |  | 0.00% |  |  |  |  |  |
In 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. |  |  |  |  |  |
In Italy [Member] | Corporate And Financial Companies [Member] | Subsidiaries Two [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Company name |  | Eni Adfin SpA (in liquidation) |  |  |  |  |  |
Registered office |  | Rome |  |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |  |
Share capital |  |  | 85,537,498.80 |  |  |  |  |
Shareholders |  | Eni SpA Third parties |  |  |  |  |  |
% Equity ratio |  | 99.67% |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |
In Italy [Member] | Corporate And Financial Companies [Member] | Subsidiaries Two [Member] | ENI SPA [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
% Ownership |  | 99.67% |  |  |  |  |  |
In Italy [Member] | Corporate And Financial Companies [Member] | Subsidiaries Two [Member] | Third parties [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
% Ownership |  | 0.33% |  |  |  |  |  |
In 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. |  |  |  |  |  |
In 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. |  |  |  |  |  |
In 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 |  |  |  |  |
Shareholders |  | Eni SpA Third parties |  |  |  |  |  |
% Equity ratio |  | 49.00% |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |
In Italy [Member] | Corporate And Financial Companies [Member] | Subsidiaries Five [Member] | ENI SPA [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
% Ownership |  | 49.00% |  |  |  |  |  |
In Italy [Member] | Corporate And Financial Companies [Member] | Subsidiaries Five [Member] | Third parties [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
% Ownership |  | 51.00% |  |  |  |  |  |
In 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. |  |  |  |  |  |
In Italy [Member] | Other Activities [Member] | Subsidiaries One [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Company name |  | Anic Partecipazioni SpA (in liquidation) |  |  |  |  |  |
Registered office |  | Ferrandina (MT) |  |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |  |
Share capital | € |  | € 4,644,000 |  |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |
In Italy [Member] | Other Activities [Member] | Subsidiaries One [Member] | Third parties [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |
% Ownership |  | 0.03% |  |  |  |  |  |
In Italy [Member] | Other Activities [Member] | Subsidiaries One [Member] | Syndial SpA [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Shareholders |  | Syndial SpA |  |  |  |  |  |
% Ownership |  | 99.97% |  |  |  |  |  |
In Italy [Member] | Other Activities [Member] | Subsidiaries One [Member] | Gela CL [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Registered office |  | Gela (CL) |  |  |  |  |  |
In Italy [Member] | Other Activities [Member] | Subsidiaries One [Member] | Anic Partecipazioni SpA [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Share capital | € |  | € 23,519,847.16 |  |  |  |  |  |
In Italy [Member] | Other Activities [Member] | Subsidiaries Two [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Company name |  | Eni Energia Srl |  |  |  |  |  |
Registered office |  | Nuoro |  |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |  |
Share capital | € |  | € 516,000 |  |  |  |  |  |
Consolidation or valutation method | [1] | Co. |  |  |  |  |  |
In Italy [Member] | Other Activities [Member] | Subsidiaries Two [Member] | ENI SPA [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |
In Italy [Member] | Other Activities [Member] | Subsidiaries Two [Member] | Third parties [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |
In Italy [Member] | Other Activities [Member] | Subsidiaries Two [Member] | Syndial SpA [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Shareholders |  | Syndial SpA |  |  |  |  |  |
In Italy [Member] | Other Activities [Member] | Subsidiaries Two [Member] | Eni Energia Srl [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Registered office |  | San Donato Milanese (MI) |  |  |  |  |  |
Share capital | € |  | € 10,000 |  |  |  |  |  |
In 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 | € |  | € 2,191,384,693 |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |
In Italy [Member] | Other Activities [Member] | Subsidiaries Three [Member] | ENI SPA [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |
In Italy [Member] | Other Activities [Member] | Subsidiaries Three [Member] | Third parties [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |
In Italy [Member] | Other Activities [Member] | Subsidiaries Three [Member] | Eni New Energy SpA [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Share capital | € |  | € 9,296,000 |  |  |  |  |  |
In 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. |  |  |  |  |  |
In Italy [Member] | Other Activities [Member] | Subsidiaries Four [Member] | Third parties [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |
% Ownership |  | 48.00% |  |  |  |  |  |
In Italy [Member] | Other Activities [Member] | Subsidiaries Four [Member] | Syndial SpA [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Shareholders |  | Syndial SpA |  |  |  |  |  |
% Ownership |  | 52.00% |  |  |  |  |  |
In 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 |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |
In Italy [Member] | Other Activities [Member] | Subsidiaries Five [Member] | Syndial SpA [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Shareholders |  | Syndial SpA |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |
In 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 | € |  | € 425,647,621.42 |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |
In Italy [Member] | Other Activities [Member] | Subsidiaries Six [Member] | ENI SPA [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |  |
% Ownership |  | 99.99% |  |  |  |  |  |
In Italy [Member] | Other Activities [Member] | Subsidiaries Six [Member] | Third parties [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |
% Ownership |  | (8212.00%) |  |  |  |  |  |
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 |  |  |  |  |
Shareholders |  | Eni International BV Eni Oil Holdings BV |  |  |  |  |  |
% 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] |  |  |  |  |  |  |  |
% Ownership |  | 99.90% |  |  |  |  |  |
Outside Italy [Member] | Corporate And Financial Companies [Member] | Subsidiaries One [Member] | Eni Oil Holdings BV [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
% 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 |  |  |  |  |
Shareholders |  | Eni International BV Eni SpA |  |  |  |  |  |
% 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] |  |  |  |  |  |  |  |
% Ownership |  | 33.61% |  |  |  |  |  |
Outside Italy [Member] | Corporate And Financial Companies [Member] | Subsidiaries Two [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
% 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 |  |  |  |  |
Shareholders |  | Eni SpA Eni UK Ltd |  |  |  |  |  |
% 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] |  |  |  |  |  |  |  |
% Ownership |  | 99.99% |  |  |  |  |  |
Outside Italy [Member] | Corporate And Financial Companies [Member] | Subsidiaries Six [Member] | Eni UK Ltd [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
% Ownership |  | 8212.00% |  |  |  |  |  |
Outside Italy [Member] | Corporate And Financial Companies [Member] | Subsidiaries Seven [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Company name |  | Eni Next Llc |  |  |  |  |  |
Registered office |  | Houston (USA) |  |  |  |  |  |
Country of operation |  | USA |  |  |  |  |  |
Share capital |  |  | $ 100 |  |  |  |  |
Shareholders |  | Eni Petroleum Co Inc |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |
Outside Italy [Member] | Other Activities [Member] | Subsidiaries One [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Company name |  | Arm Wind Llp |  |  |  |  |  |
Registered office |  | Saddar Town- Karachi (Pakistan) |  |  |  |  |  |
Country of operation |  | Kazakhstan |  |  |  |  |  |
Share capital |  |  |  |  |  | ₨ 1,200,000 | ₸ 2,133,967,100 |
% Equity ratio |  | 90.00% |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |
Outside Italy [Member] | Other Activities [Member] | Subsidiaries One [Member] | Third parties [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |
Outside Italy [Member] | Other Activities [Member] | Subsidiaries One [Member] | Windirect BV [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Shareholders |  | Windirect BV |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |
Outside Italy [Member] | Other Activities [Member] | Subsidiaries One [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |  |  |
Outside Italy [Member] | Other Activities [Member] | Subsidiaries One [Member] | Arm Wind Lip [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Registered office |  | Astana (Kazakhstan) |  |  |  |  |  |
Outside Italy [Member] | Other Activities [Member] | Subsidiaries Two [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 Two [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |  |  |
% Ownership |  | 99.98% |  |  |  |  |  |
Outside Italy [Member] | Other Activities [Member] | Subsidiaries Two [Member] | Ieoc Exploration BV [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Shareholders |  | Ieoc Exploration BV |  |  |  |  |  |
% Ownership |  | 0.01% |  |  |  |  |  |
Outside Italy [Member] | Other Activities [Member] | Subsidiaries Two [Member] | Ieoc Production BV [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Shareholders |  | Ieoc Production BV |  |  |  |  |  |
% Ownership |  | 0.01% |  |  |  |  |  |
Outside Italy [Member] | Other Activities [Member] | Subsidiaries Three [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 |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |
Outside Italy [Member] | Other Activities [Member] | Subsidiaries Three [Member] | Syndial SpA [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Shareholders |  | Syndial SpA |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |
Outside Italy [Member] | Other Activities [Member] | Subsidiaries Four [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Company name |  | Windirect BV |  |  |  |  |  |
Registered office |  | Amsterdam (Netherlands) |  |  |  |  |  |
Country of operation |  | Netherlands |  |  |  |  |  |
Share capital | € |  | € 10,000 |  |  |  |  |  |
% Equity ratio |  | 90.00% |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |
Outside Italy [Member] | Other Activities [Member] | Subsidiaries Four [Member] | Third parties [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |
% Ownership |  | 10.00% |  |  |  |  |  |
Outside Italy [Member] | Other Activities [Member] | Subsidiaries Four [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |  |  |
% Ownership |  | 90.00% |  |  |  |  |  |
[1] | F.C. = full consolidation, J.O. = joint operation, Eq. = equity-accounted, Co. = valued at cost, F.V. = valued at fair value

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