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Other information about investments (Details 1) - EUR (€) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of subsidiaries [line items] |  |  |
Share Capital |  | € 4,005,000,000 | € 4,005,000,000
Italy [Member] | Exploration & Production [Member] | Subsidiaries One [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Company name |  | Eni Angola SpA |
Registered office |  | San Donato Milanese (MI) |
Country of operation |  | Angola |
Share Capital |  | € 20,200,000 |
Shareholders |  | Eni SpA |
% Ownership |  | 100.00% |
% Equity ratio |  | 100.00% |
Consolidation or valutation method | [1] | F.C. |
Italy [Member] | Exploration & Production [Member] | Subsidiaries Two [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Company name |  | Eni Mediterranea Idrocarburi SpA |
Registered office |  | Gela (CL) |
Country of operation |  | Italy |
Share Capital |  | € 5,200,000 |
Shareholders |  | Eni SpA |
% Ownership |  | 100.00% |
% Equity ratio |  | 100.00% |
Consolidation or valutation method | [1] | F.C. |
Italy [Member] | Exploration & Production [Member] | Subsidiaries Three [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Company name |  | Eni Mozambico SpA |
Registered office |  | San Donato Milanese (MI) |
Country of operation |  | Mozambique |
Share Capital |  | € 200,000 |
Shareholders |  | Eni SpA |
% Ownership |  | 100.00% |
% Equity ratio |  | 100.00% |
Consolidation or valutation method | [1] | F.C. |
Italy [Member] | Exploration & Production [Member] | Subsidiaries Four [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Company name |  | Eni Timor Leste SpA |
Registered office |  | San Donato Milanese (MI) |
Country of operation |  | East Timor |
Share Capital |  | € 6,841,517 |
Shareholders |  | Eni SpA |
% Ownership |  | 100.00% |
% Equity ratio |  | 100.00% |
Consolidation or valutation method | [1] | F.C. |
Italy [Member] | Exploration & Production [Member] | Subsidiaries Five [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Company name |  | Eni West Africa SpA |
Registered office |  | San Donato Milanese (MI) |
Country of operation |  | Angola |
Share Capital |  | € 10,000,000 |
Shareholders |  | Eni SpA |
% Ownership |  | 100.00% |
% Equity ratio |  | 100.00% |
Consolidation or valutation method | [1] | F.C. |
Italy [Member] | Exploration & Production [Member] | Subsidiaries Six [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Company name |  | Eni Zubair SpA (in liquidation) |
Registered office |  | San Donato Milanese (MI) |
Country of operation |  | Italy |
Share Capital |  | € 120,000 |
Shareholders |  | Eni SpA |
% Ownership |  | 100.00% |
Consolidation or valutation method | [1] | Co. |
Italy [Member] | Exploration & Production [Member] | Subsidiaries Seven [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Company name |  | EniProgetti SpA (former Tecnomare - Societa per lo Sviluppo delle Tecnologie Marine SpA) |
Registered office |  | Venezia Marghera (VE) |
Country of operation |  | Italy |
Share Capital |  | € 2,064,000 |
Shareholders |  | Eni SpA |
% Ownership |  | 100.00% |
% Equity ratio |  | 100.00% |
Consolidation or valutation method | [1] | F.C. |
Italy [Member] | Exploration & Production [Member] | Subsidiaries Eight [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Company name |  | Floaters SpA |
Registered office |  | San Donato Milanese (MI) |
Country of operation |  | Italy |
Share Capital |  | € 200,120,000 |
Shareholders |  | Eni SpA |
% Ownership |  | 100.00% |
% Equity ratio |  | 100.00% |
Consolidation or valutation method | [1] | F.C. |
Italy [Member] | Exploration & Production [Member] | Subsidiaries Nine [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Company name |  | Ieoc SpA |
Registered office |  | San Donato Milanese (MI) |
Country of operation |  | Egypt |
Share Capital |  | € 18,331,000 |
Shareholders |  | Eni SpA |
% Ownership |  | 100.00% |
% Equity ratio |  | 100.00% |
Consolidation or valutation method | [1] | F.C. |
Italy [Member] | Exploration & Production [Member] | Subsidiaries Ten [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Company name |  | Societa Petrolifera |
Registered office |  | San Donato Milanese (MI) |
Country of operation |  | Italy |
Share Capital |  | € 24,103,200 |
% Equity ratio |  | 99.96% |
Consolidation or valutation method | [1] | F.C. |
Italy [Member] | Exploration & Production [Member] | Subsidiaries Ten [Member] | Eni SpA [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Shareholders |  | Eni SpA |
% Ownership |  | 99.96% |
Italy [Member] | Exploration & Production [Member] | Subsidiaries Ten [Member] | Other Related Parties [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Shareholders |  | Third parties |
% Ownership |  | 0.04% |
[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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