XML 268 R261.htm IDEA: XBRL DOCUMENT
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Other information about investments (Details 8) | 12 Months Ended |  |
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Dec. 31, 2017 EUR (€) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 HUF (Ft) | Dec. 31, 2017 TND (د.ت) | Dec. 31, 2017 CHF (SFr) | Dec. 31, 2016 EUR (€)
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Share capital |  | € 4,005,000,000 |  |  |  |  | € 4,005,000,000
Italy [Member] | Gas & Power [Member] | Subsidiaries One [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name | [1] | Mariconsult SpA(†) |  |  |  |  |
Registered office |  | Milan |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |
Share capital |  | € 120,000 |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |
Italy [Member] | Gas & Power [Member] | Subsidiaries One [Member] | Eni SpA [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |
Italy [Member] | Gas & Power [Member] | Subsidiaries One [Member] | Third parties [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |
Italy [Member] | Gas & Power [Member] | Subsidiaries Two [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name | [1] | Società EniPower Ferrara Srl(†) |  |  |  |  |
Registered office |  | San Donato Milanese (MI) |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |
Share capital |  | € 140,000,000 |  |  |  |  |
% Equity ratio |  | 51.00% |  |  |  |  |
Consolidation or valutation method | [1] | J.O. |  |  |  |  |
Italy [Member] | Gas & Power [Member] | Subsidiaries Two [Member] | Third parties [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |
% Ownership |  | 49.00% |  |  |  |  |
Italy [Member] | Gas & Power [Member] | Subsidiaries Two [Member] | EniPower SpA [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | EniPower SpA |  |  |  |  |
% Ownership |  | 51.00% |  |  |  |  |
Italy [Member] | Gas & Power [Member] | Subsidiaries Three [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name | [1] | Transmed SpA(†) |  |  |  |  |
Registered office |  | Milan |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |
Share capital |  | € 240,000 |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |
Italy [Member] | Gas & Power [Member] | Subsidiaries Three [Member] | Eni SpA [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |
Italy [Member] | Gas & Power [Member] | Subsidiaries Three [Member] | Third parties [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |
Outside Italy [Member] | Gas & Power [Member] | Subsidiaries One [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name | [1] | Blue Stream Pipeline Co BV(†) |  |  |  |  |
Registered office |  | Amsterdam (Netherlands) |  |  |  |  |
Country of operation |  | Russia |  |  |  |  |
Share capital | $ |  |  | $ 22,000 |  |  |  |
% Equity ratio |  | 50.00% |  |  |  |  |
Consolidation or valutation method | [1] | J.O. |  |  |  |  |
Outside Italy [Member] | Gas & Power [Member] | Subsidiaries One [Member] | Third parties [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |
Outside Italy [Member] | Gas & Power [Member] | Subsidiaries One [Member] | Eni International BV [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |
Outside Italy [Member] | Gas & Power [Member] | Subsidiaries Two [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name | [1] | Gas Distribution Company of Thessaloniki - Thessaly SA(†) |  |  |  |  |
Registered office |  | Ampelokipi-Menemeni (Greece) |  |  |  |  |
Country of operation |  | Greece |  |  |  |  |
Share capital |  | € 247,127,605 |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |
Outside Italy [Member] | Gas & Power [Member] | Subsidiaries Two [Member] | Third parties [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |
% Ownership |  | 51.00% |  |  |  |  |
Outside Italy [Member] | Gas & Power [Member] | Subsidiaries Two [Member] | Eni gas e luce SpA [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Eni gas e luce SpA |  |  |  |  |
% Ownership |  | 49.00% |  |  |  |  |
Outside Italy [Member] | Gas & Power [Member] | Subsidiaries Three [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name | [1] | Gas Supply Company of Thessaloniki - Thessalia SA(†) |  |  |  |  |
Registered office |  | Thessaloniki (Greece) |  |  |  |  |
Country of operation |  | Greece |  |  |  |  |
Share capital |  | € 13,761,788 |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |
Outside Italy [Member] | Gas & Power [Member] | Subsidiaries Three [Member] | Third parties [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |
% Ownership |  | 51.00% |  |  |  |  |
Outside Italy [Member] | Gas & Power [Member] | Subsidiaries Three [Member] | Eni gas e luce SpA [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Eni gas e luce SpA |  |  |  |  |
% Ownership |  | 49.00% |  |  |  |  |
Outside Italy [Member] | Gas & Power [Member] | Subsidiaries Four [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name | [1] | GreenStream BV(†) |  |  |  |  |
Registered office |  | Amsterdam (Netherlands) |  |  |  |  |
Country of operation |  | Libya |  |  |  |  |
Share capital |  | € 200,000,000 |  |  |  |  |
% Equity ratio |  | 50.00% |  |  |  |  |
Consolidation or valutation method | [1] | J.O. |  |  |  |  |
Outside Italy [Member] | Gas & Power [Member] | Subsidiaries Four [Member] | Third parties [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |
Outside Italy [Member] | Gas & Power [Member] | Subsidiaries Four [Member] | Eni North Africa BV [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Eni North Africa BV |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |
Outside Italy [Member] | Gas & Power [Member] | Subsidiaries Five [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name |  | Premium Multiservices SA |  |  |  |  |
Registered office |  | Tunisi (Tunisia) |  |  |  |  |
Country of operation |  | Tunisia |  |  |  |  |
Share capital | د.ت |  |  |  |  | د.ت 200,000 |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |
Outside Italy [Member] | Gas & Power [Member] | Subsidiaries Five [Member] | Third parties [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |
% Ownership |  | 50.01% |  |  |  |  |
Outside Italy [Member] | Gas & Power [Member] | Subsidiaries Five [Member] | Sergaz SA [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Sergaz SA |  |  |  |  |
% Ownership |  | 49.99% |  |  |  |  |
Outside Italy [Member] | Gas & Power [Member] | Subsidiaries Six [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name |  | SAMCO Sagl |  |  |  |  |
Registered office |  | Lugano (Switzerland) |  |  |  |  |
Country of operation |  | Switzerland |  |  |  |  |
Share capital | SFr |  |  |  |  |  | SFr 20,000 |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |
Outside Italy [Member] | Gas & Power [Member] | Subsidiaries Six [Member] | Third parties [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |
% Ownership |  | 5.00% |  |  |  |  |
Outside Italy [Member] | Gas & Power [Member] | Subsidiaries Six [Member] | Eni International BV [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |  |
% Ownership |  | 5.00% |  |  |  |  |
Outside Italy [Member] | Gas & Power [Member] | Subsidiaries Six [Member] | Transmed.Pip.Co Ltd [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Transmed.Pip.Co Ltd |  |  |  |  |
% Ownership |  | 90.00% |  |  |  |  |
Outside Italy [Member] | Gas & Power [Member] | Subsidiaries Seven [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name | [1] | Transmediterranean Pipeline Co Ltd(†) |  |  |  |  |
Registered office |  | St. Helier (Jersey) |  |  |  |  |
Country of operation |  | Jersey |  |  |  |  |
Share capital | $ |  |  | $ 10,310,000 |  |  |  |
% Equity ratio |  | 50.00% |  |  |  |  |
Consolidation or valutation method | [1] | J.O. |  |  |  |  |
Outside Italy [Member] | Gas & Power [Member] | Subsidiaries Seven [Member] | Eni SpA [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |
Outside Italy [Member] | Gas & Power [Member] | Subsidiaries Seven [Member] | Third parties [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |
Outside Italy [Member] | Gas & Power [Member] | Subsidiaries Eight [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name | [1] | Turul Gázvezeték Építõ es Vagyonkezelõ Részvénytársaság(†) |  |  |  |  |
Registered office |  | Tatabànya (Hungary) |  |  |  |  |
Country of operation |  | Hungary |  |  |  |  |
Share capital | Ft |  |  |  | Ft 404,000,000 |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |
Outside Italy [Member] | Gas & Power [Member] | Subsidiaries Eight [Member] | Third parties [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |
% Ownership |  | 41.58% |  |  |  |  |
Outside Italy [Member] | Gas & Power [Member] | Subsidiaries Eight [Member] | Tigaz Zrt [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Tigáz Zrt |  |  |  |  |
% Ownership |  | 58.42% |  |  |  |  |
Outside Italy [Member] | Gas & Power [Member] | Subsidiaries Nine [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Company name | [1] | Unión Fenosa Gas SA(†) |  |  |  |  |
Registered office |  | Madrid (Spain) |  |  |  |  |
Country of operation |  | Spain |  |  |  |  |
Share capital |  | € 32,772,000 |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |
Outside Italy [Member] | Gas & Power [Member] | Subsidiaries Nine [Member] | Eni SpA [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |
Outside Italy [Member] | Gas & Power [Member] | Subsidiaries Nine [Member] | Third parties [Member] |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |
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