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Other information about investments (Details 11) - 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] | Other Activities [Member] | Subsidiaries One [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Company name |  | Filatura Tessile Nazionale Italiana - FILTENI SpA (in liquidation) |
Registered office |  | Ferrandina (MT) |
Country of operation |  | Italy |
Share capital |  | € 4,644,000 |
Consolidation or valutation method | [1] | Co. |
Italy [Member] | Other Activities [Member] | Subsidiaries One [Member] | Syndial SpA [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Shareholders |  | Syndial SpA |
% Ownership | [2] | 59.56% |
Italy [Member] | Other Activities [Member] | Subsidiaries One [Member] | Third parties [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Shareholders |  | Third parties |
% Ownership |  | 40.44% |
Italy [Member] | Other Activities [Member] | Subsidiaries Two [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Company name |  | Ottana Sviluppo ScpA (in liquidation) |
Registered office |  | Nuoro |
Country of operation |  | Italy |
Share capital |  | € 516,000 |
Consolidation or valutation method | [1] | Eq. |
Italy [Member] | Other Activities [Member] | Subsidiaries Two [Member] | Syndial SpA [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Shareholders |  | Syndial SpA |
% Ownership |  | 30.00% |
Italy [Member] | Other Activities [Member] | Subsidiaries Two [Member] | Third parties [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Shareholders |  | Third parties |
% Ownership |  | 70.00% |
Italy [Member] | Other Activities [Member] | Subsidiaries Three [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Company name | [1],[3] | Saipem SpA(#) (†) |
Registered office |  | San Donato Milanese (MI) |
Country of operation |  | Italy |
Share capital |  | € 2,191,384,693 |
Consolidation or valutation method | [1] | Eq. |
Italy [Member] | Other Activities [Member] | Subsidiaries Three [Member] | Third parties [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Shareholders |  | Third parties |
% Ownership |  | 67.98% |
Italy [Member] | Other Activities [Member] | Subsidiaries Three [Member] | Eni SpA [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Shareholders |  | Eni SpA |
% Ownership | [4] | 30.54% |
Italy [Member] | Other Activities [Member] | Subsidiaries Three [Member] | Saipem SpA [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Shareholders |  | Saipem SpA |
% Ownership |  | 1.48% |
[1] | Jointly controlled entity.
[2] | Controlling interest: Syndial SpA 48.00 Third parties 52.00
[3] | Company with shares quoted in the regulated market of Italy or of other EU countries
[4] | Controlling interest: Eni SpA 31.00 Third parties 69.00

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