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Other information about investments (Details 15) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 EUR (€) | Dec. 31, 2017 GBP (£) | Dec. 31, 2016 EUR (€)
Disclosure of subsidiaries [line items] |  |  |  |
Share Capital |  | € 4,005,000,000 |  | € 4,005,000,000
Corporate And Other Activities [Member] | Eni SpA [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
% Ownership |  | 10.08% |  |
Italy [Member] | Corporate And Other Activities [Member] | Subsidiaries [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Company name |  | Emittenti Titoli SpA (in liquidation) |  |
Registered office |  | Milan |  |
Country of operation |  | Italy |  |
Share Capital |  | € 4,264,000 |  |
Consolidation or valutation method | [1] | Co. |  |
Italy [Member] | Corporate And Other Activities [Member] | Subsidiaries [Member] | Eni SpA [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Shareholders |  | Eni SpA |  |
% Ownership | [2] | 10.00% |  |
Italy [Member] | Corporate And Other Activities [Member] | Subsidiaries [Member] | Emittenti Titoli SpA (L) [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Shareholders |  | Emittenti Titoli SpA (L) |  |
% Ownership |  | 0.78% |  |
Italy [Member] | Corporate And Other Activities [Member] | Subsidiaries [Member] | Third parties [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Shareholders |  | Third parties |  |
% Ownership |  | 89.22% |  |
Outside Italy [Member] | Corporate And Other Activities [Member] | Subsidiaries [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Company name |  | OGCI Climate Investments Llp |  |
Registered office |  | London (United Kingdom) |  |
Country of operation |  | United Kingdom |  |
Share Capital | £ | [3] |  | £ 0 |
Consolidation or valutation method | [1] | Co. |  |
Outside Italy [Member] | Corporate And Other Activities [Member] | Subsidiaries [Member] | Third parties [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Shareholders |  | Third parties |  |
% Ownership |  | 85.71% |  |
Outside Italy [Member] | Corporate And Other Activities [Member] | Subsidiaries [Member] | Eni UK Ltd [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Shareholders |  | Eni UK Ltd |  |
% Ownership |  | 14.29% |  |
[1] | Jointly controlled entity.
[2] | Controlling interest: Eni SpA 10.08 Third parties 89.92
[3] | Shares without nominal value.

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