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Other information about investments (Details 16) | 12 Months Ended
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Dec. 31, 2017
Joint Ventures One [Member] |
Disclosure of subsidiaries [line items] |
Company name | Gas Distribution Company of Thessaloniki - Thessaly SA
Registered office | Ampelokipi-Menemeni (Greece)
Operating office | Greece
Business segment | Gas & Power
% ownership interest | 49.00%
% voting rights | 49.00%
Joint Ventures Two [Member] |
Disclosure of subsidiaries [line items] |
Company name | Lotte Versalis Elastomers Co Ltd
Registered office | Yeosu (South Korea)
Operating office | South Korea
Business segment | Chemical
% ownership interest | 50.00%
% voting rights | 50.00%
Joint Ventures Three [Member] |
Disclosure of subsidiaries [line items] |
Company name | PetroJunín SA
Registered office | Caracas (Venezuela)
Operating office | Venezuela
Business segment | Exploration & Production
% ownership interest | 40.00%
% voting rights | 40.00%
Joint Ventures Four [Member] |
Disclosure of subsidiaries [line items] |
Company name | Saipem SpA
Registered office | San Donato Milanese (MI) (Italy)
Operating office | Italia
Business segment | Other Activities
% ownership interest | 30.54%
% voting rights | 31.00%
Joint Ventures Five [Member] |
Disclosure of subsidiaries [line items] |
Company name | Unión Fenosa Gas SA
Registered office | Madrid (Spain)
Operating office | Spain
Business segment | Gas & Power
% ownership interest | 50.00%
% voting rights | 50.00%
Joint Operations One [Member] |
Disclosure of subsidiaries [line items] |
Company name | Blue Stream Pipeline Co BV
Registered office | Amsterdam (Netherlands)
Operating office | Russia
Business segment | Gas & Power
% ownership interest | 50.00%
% voting rights | 50.00%
Joint Operations Two [Member] |
Disclosure of subsidiaries [line items] |
Company name | Mozambique Rovuma Venture SpA (former Eni East Africa SpA)
Registered office | San Donato Milanese (MI) (Italy)
Operating office | Mozambique
Business segment | Exploration & Production
% ownership interest | 35.71%
% voting rights | 35.71%
Joint Operations Three [Member] |
Disclosure of subsidiaries [line items] |
Company name | Raffineria di Milazzo ScpA
Registered office | Milazzo (ME) (Italy)
Operating office | Italy
Business segment | Refining & Marketing
% ownership interest | 50.00%
% voting rights | 50.00%
Associates [Member] |
Disclosure of subsidiaries [line items] |
Company name | Angola LNG Ltd
Registered office | Hamilton (Bermuda)
Operating office | Angola
Business segment | Exploration & Production
% ownership interest | 13.60%
% voting rights | 13.60%

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