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Other information about investments (Details 13) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 EUR (€) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 EUR (€)
Disclosure of subsidiaries [line items] |  |  |  |
Share capital |  | € 4,005,000,000 |  | € 4,005,000,000
Outside Italy [Member] | Other significant investments Gas & Power [Member] | Subsidiaries One [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Company name |  | Angola LNG Supply Services Llc |  |
Registered office |  | Wilmington (USA) |  |
Country of operation |  | USA |  |
Share capital | $ |  |  | $ 19,278,782 |
Method used to account for investments in subsidiaries | [1] | Co. |  |
Outside Italy [Member] | Other significant investments Gas & Power [Member] | Subsidiaries One [Member] | Eni USA Gas M. Llc [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Name of Shareholders |  | Eni USA Gas M. Llc |  |
% Ownership |  | 13.60% |  |
Outside Italy [Member] | Other significant investments Gas & Power [Member] | Subsidiaries One [Member] | Third parties [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Name of Shareholders |  | Third parties |  |
% Ownership |  | 86.40% |  |
Outside Italy [Member] | Other significant investments Gas & Power [Member] | Subsidiaries Two [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Company name |  | Norsea Gas GmbH |  |
Registered office |  | Emden (Germany) |  |
Country of operation |  | Germany |  |
Share capital |  | € 1,533,875.64 |  |
Method used to account for investments in subsidiaries | [1] | Co. |  |
Outside Italy [Member] | Other significant investments Gas & Power [Member] | Subsidiaries Two [Member] | Third parties [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Name of Shareholders |  | Third parties |  |
% Ownership |  | 86.96% |  |
Outside Italy [Member] | Other significant investments Gas & Power [Member] | Subsidiaries Two [Member] | Eni International BV [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Name of Shareholders |  | Eni International BV |  |
% Ownership |  | 13.04% |  |
[1] | Jointly controlled entity.

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