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Other information about investments (Details 3) - 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
Subsidiaries One [Member] | Gas & Power [Member] | Italy [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Company name |  | Eni gas e luce SpA |
Registered office |  | San Donato Milanese (MI) |
Country of operation |  | Italy |
Share capital |  | € 750,000,000 |
Shareholders |  | Eni SpA |
% Ownership |  | 100.00% |
% Equity ratio |  | 100.00% |
Consolidation or valutation method | [1] | F.C. |
Subsidiaries One [Member] | Gas & Power [Member] | Outside Italy [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Company name |  | Adriaplin Podjetje za distribucijo zemeljskega plina doo Ljubljana |
Registered office |  | Ljubljana (Slovenia) |
Country of operation |  | Slovenia |
Share capital |  | € 12,956,935 |
% Equity ratio |  | 51.00% |
Consolidation or valutation method | [1] | F.C. |
Subsidiaries One [Member] | Gas & Power [Member] | Outside Italy [Member] | Eni gas e luce SpA [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Shareholders |  | Eni gas e luce SpA |
% Ownership |  | 51.00% |
Subsidiaries One [Member] | Gas & Power [Member] | Outside Italy [Member] | Third parties [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Shareholders |  | Third parties |
% Ownership |  | 49.00% |
Subsidiaries Two [Member] | Gas & Power [Member] | Italy [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Company name |  | Eni Gas Transport Services Srl |
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. |
Subsidiaries Two [Member] | Gas & Power [Member] | Outside Italy [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Company name |  | Eni G&P Trading BV |
Registered office |  | Amsterdam (Netherlands) |
Country of operation |  | Turkey |
Share capital |  | € 70,000 |
Shareholders |  | Eni International BV |
% Ownership |  | 100.00% |
% Equity ratio |  | 100.00% |
Consolidation or valutation method | [1] | F.C. |
Subsidiaries Three [Member] | Gas & Power [Member] | Italy [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Company name |  | Eni Trading & Shipping SpA |
Registered office |  | Rome |
Country of operation |  | Italy |
Share capital |  | € 60,036,650 |
Shareholders |  | Eni SpA |
% Ownership |  | 100.00% |
% Equity ratio |  | 100.00% |
Consolidation or valutation method | [1] | F.C. |
Subsidiaries Three [Member] | Gas & Power [Member] | Outside Italy [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Company name |  | Eni Gas & Power France SA |
Registered office |  | Levallois Perret (France) |
Country of operation |  | France |
Share capital |  | € 29,937,600 |
% Equity ratio |  | 99.87% |
Consolidation or valutation method | [1] | F.C. |
Subsidiaries Three [Member] | Gas & Power [Member] | Outside Italy [Member] | Eni gas e luce SpA [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Shareholders |  | Eni gas e luce SpA |
% Ownership |  | 99.87% |
Subsidiaries Three [Member] | Gas & Power [Member] | Outside Italy [Member] | Third parties [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Shareholders |  | Third parties |
% Ownership |  | 0.13% |
Subsidiaries Four [Member] | Gas & Power [Member] | Italy [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Company name |  | EniPower Mantova SpA |
Registered office |  | San Donato Milanese (MI) |
Country of operation |  | Italy |
Share capital |  | € 144,000,000 |
% Equity ratio |  | 86.50% |
Consolidation or valutation method | [1] | F.C. |
Subsidiaries Four [Member] | Gas & Power [Member] | Italy [Member] | Eni Power SpA [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Shareholders |  | EniPower SpA |
% Ownership |  | 86.50% |
Subsidiaries Four [Member] | Gas & Power [Member] | Italy [Member] | Other Related Parties [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Shareholders |  | Third parties |
% Ownership |  | 13.50% |
Subsidiaries Four [Member] | Gas & Power [Member] | Outside Italy [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Company name |  | Eni Trading & Shipping Inc |
Registered office |  | Dover, Delaware (USA) |
Country of operation |  | USA |
Share capital |  | € 36,000,000 |
Shareholders |  | ETS SpA |
% Ownership |  | 100.00% |
% Equity ratio |  | 100.00% |
Consolidation or valutation method | [1] | F.C. |
Subsidiaries Five [Member] | Gas & Power [Member] | Italy [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Company name |  | EniPower SpA |
Registered office |  | San Donato Milanese (MI) |
Country of operation |  | Italy |
Share capital |  | € 944,947,849 |
Shareholders |  | Eni SpA |
% Ownership |  | 100.00% |
% Equity ratio |  | 100.00% |
Consolidation or valutation method | [1] | F.C. |
Subsidiaries Five [Member] | Gas & Power [Member] | Outside Italy [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Company name |  | Société de Service du Gazoduc Transtunisien SA - Sergaz SA |
Registered office |  | Tunisi (Tunisia) |
Country of operation |  | Tunisia |
Share capital |  | € 99,000 |
% Equity ratio |  | 66.67% |
Consolidation or valutation method | [1] | F.C. |
Subsidiaries Five [Member] | Gas & Power [Member] | Outside Italy [Member] | Third parties [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Shareholders |  | Third parties |
% Ownership |  | 33.33% |
Subsidiaries Five [Member] | Gas & Power [Member] | Outside Italy [Member] | Eni International BV [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Shareholders |  | Eni International BV |
% Ownership |  | 66.67% |
Subsidiaries Six [Member] | Gas & Power [Member] | Italy [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Company name |  | LNG Shipping SpA |
Registered office |  | San Donato Milanese (MI) |
Country of operation |  | Italy |
Share capital |  | € 240,900,000 |
Shareholders |  | Eni SpA |
% Ownership |  | 100.00% |
% Equity ratio |  | 100.00% |
Consolidation or valutation method | [1] | F.C. |
Subsidiaries Six [Member] | Gas & Power [Member] | Outside Italy [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Company name |  | Société pour la Construction du Gazoduc Transtunisien SA - Scogat SA |
Registered office |  | Tunisi (Tunisia) |
Country of operation |  | Tunisia |
Share capital |  | € 200,000 |
% Equity ratio |  | 100.00% |
Consolidation or valutation method | [1] | F.C. |
Subsidiaries Six [Member] | Gas & Power [Member] | Outside Italy [Member] | Eni International BV [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Shareholders |  | Eni International BV |
% Ownership |  | 99.85% |
Subsidiaries Six [Member] | Gas & Power [Member] | Outside Italy [Member] | Eni SpA [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Shareholders |  | Eni SpA |
% Ownership |  | 0.05% |
Subsidiaries Six [Member] | Gas & Power [Member] | Outside Italy [Member] | LNG Shipping SpA [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Shareholders |  | LNG Shipping SpA |
% Ownership |  | 0.05% |
Subsidiaries Six [Member] | Gas & Power [Member] | Outside Italy [Member] | Trans Tunis.P.Co SpA [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Shareholders |  | Trans Tunis.P.Co SpA |
% Ownership |  | 0.05% |
Subsidiaries Seven [Member] | Gas & Power [Member] | Italy [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Company name |  | Trans Tunisian Pipeline Co SpA |
Registered office |  | San Donato Milanese (MI) |
Country of operation |  | Tunisia |
Share capital |  | € 1,098,000 |
Shareholders |  | Eni SpA |
% Ownership |  | 100.00% |
% Equity ratio |  | 100.00% |
Consolidation or valutation method | [1] | F.C. |
Subsidiaries Seven [Member] | Gas & Power [Member] | Outside Italy [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Company name |  | Tigáz-Dso Földgázelosztó kft |
Registered office |  | Hajdúszoboszló (Hungary) |
Country of operation |  | Hungary |
Share capital |  | € 31,033,000,000 |
Shareholders |  | Tigáz Zrt |
% Ownership |  | 100.00% |
% Equity ratio |  | 98.99% |
Consolidation or valutation method | [1] | F.C. |
Subsidiaries Eight [Member] | Gas & Power [Member] | Outside Italy [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Company name |  | Tigáz Tiszántúli Gázszolgáltató Zártkörûen Mûködõ Részvénytársaság |
Registered office |  | Hajdúszoboszló (Hungary) |
Country of operation |  | Hungary |
Share capital |  | € 8,486,070,500 |
% Equity ratio |  | 98.99% |
Consolidation or valutation method | [1] | F.C. |
Subsidiaries Eight [Member] | Gas & Power [Member] | Outside Italy [Member] | Third parties [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Shareholders |  | Third parties |
% Ownership |  | 1.01% |
Subsidiaries Eight [Member] | Gas & Power [Member] | Outside Italy [Member] | Eni SpA [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Shareholders |  | Eni SpA |
% Ownership |  | 98.99% |
[1] | Jointly controlled entity.

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