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Other information about investments (Details 12) | 12 Months Ended |  |
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Dec. 31, 2017 EUR (€) | Dec. 31, 2017 GBP (£) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 AUD ($) | Dec. 31, 2017 EGP (ج.م.) | Dec. 31, 2017 VEF ( ) | Dec. 31, 2017 AOA (Kz) | Dec. 31, 2016 EUR (€)
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Share capital | € |  | € 4,005,000,000 |  |  |  |  |  |  | € 4,005,000,000
Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries One [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name |  | Consorzio Universitario in Ingegneria per la Qualità e l’Innovazione |  |  |  |  |  |  |
Registered office |  | Pisa |  |  |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |  |  |
Share capital | € |  | € 135,000 |  |  |  |  |  |  |
Method used to account for investments in subsidiaries | [1] | Co. |  |  |  |  |  |  |
Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries One [Member] | Eni SpA [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Name of Shareholders |  | Eni SpA |  |  |  |  |  |  |
% Ownership |  | 20.00% |  |  |  |  |  |  |
Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries One [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 80.00% |  |  |  |  |  |  |
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries One [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name |  | Administradora del Golfo de Paria Este SA |  |  |  |  |  |  |
Registered office |  | Caracas (Venezuela) |  |  |  |  |  |  |
Country of operation |  | Venezuela |  |  |  |  |  |  |
Share capital | |  |  |  |  |  |  | 100 |  |
Method used to account for investments in subsidiaries | [1] | Co. |  |  |  |  |  |  |
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries One [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 80.50% |  |  |  |  |  |  |
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries One [Member] | Eni Venezuela BV [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Name of Shareholders |  | Eni Venezuela BV |  |  |  |  |  |  |
% Ownership |  | 19.50% |  |  |  |  |  |  |
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Two [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name |  | Brass LNG Ltd |  |  |  |  |  |  |
Registered office |  | Lagos (Nigeria) |  |  |  |  |  |  |
Country of operation |  | Nigeria |  |  |  |  |  |  |
Share capital |  |  |  | $ 1,000,000 |  |  |  |  |
Method used to account for investments in subsidiaries | [1] | Co. |  |  |  |  |  |  |
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Two [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 79.52% |  |  |  |  |  |  |
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Two [Member] | Eni Int. NA NV Sarl [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Name of Shareholders |  | Eni Int. NA NV Sàrl |  |  |  |  |  |  |
% Ownership |  | 20.48% |  |  |  |  |  |  |
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Three [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name |  | Darwin LNG Pty Ltd |  |  |  |  |  |  |
Registered office |  | West Perth (Australia) |  |  |  |  |  |  |
Country of operation |  | Australia |  |  |  |  |  |  |
Share capital |  |  |  |  | $ 692,507,924.87 |  |  |  |
Method used to account for investments in subsidiaries | [1] | Co. |  |  |  |  |  |  |
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Three [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 89.01% |  |  |  |  |  |  |
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Three [Member] | Eni G&P LNG Aus. BV [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Name of Shareholders |  | Eni G&P LNG Aus. BV |  |  |  |  |  |  |
% Ownership |  | 10.99% |  |  |  |  |  |  |
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Four [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name |  | New Liberty Residential Co Llc |  |  |  |  |  |  |
Registered office |  | West Trenton (USA) |  |  |  |  |  |  |
Country of operation |  | USA |  |  |  |  |  |  |
Share capital | [2] |  |  | 0 |  |  |  |  |
Method used to account for investments in subsidiaries | [1] | Co. |  |  |  |  |  |  |
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Four [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 82.50% |  |  |  |  |  |  |
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Four [Member] | Eni Oil & Gas Inc [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Name of Shareholders |  | Eni Oil & Gas Inc |  |  |  |  |  |  |
% Ownership |  | 17.50% |  |  |  |  |  |  |
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Five [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name |  | Nigeria LNG Ltd |  |  |  |  |  |  |
Registered office |  | Port Harcourt (Nigeria) |  |  |  |  |  |  |
Country of operation |  | Nigeria |  |  |  |  |  |  |
Share capital |  |  |  | 1,138,207,000 |  |  |  |  |
Method used to account for investments in subsidiaries | [1] | Co. |  |  |  |  |  |  |
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Five [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 89.60% |  |  |  |  |  |  |
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Five [Member] | Eni Int. NA NV Sarl [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Name of Shareholders |  | Eni Int. NA NV Sàrl |  |  |  |  |  |  |
% Ownership |  | 10.40% |  |  |  |  |  |  |
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Six [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name |  | Norsea Pipeline Ltd |  |  |  |  |  |  |
Registered office |  | Woking Surrey (United Kingdom) |  |  |  |  |  |  |
Country of operation |  | United Kingdom |  |  |  |  |  |  |
Share capital | £ |  |  | £ 7,614,062 |  |  |  |  |  |
Method used to account for investments in subsidiaries | [1] | Co. |  |  |  |  |  |  |
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Six [Member] | Eni SpA [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Name of Shareholders |  | Eni SpA |  |  |  |  |  |  |
% Ownership |  | 10.32% |  |  |  |  |  |  |
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Six [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 89.68% |  |  |  |  |  |  |
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Seven [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name |  | North Caspian Operating Co NV |  |  |  |  |  |  |
Registered office |  | Amsterdam (Netherlands) |  |  |  |  |  |  |
Country of operation |  | Kazakhstan |  |  |  |  |  |  |
Share capital | € |  | € 128,520 |  |  |  |  |  |  |
Method used to account for investments in subsidiaries | [1] | Co. |  |  |  |  |  |  |
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Seven [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 83.19% |  |  |  |  |  |  |
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Seven [Member] | Agip Caspian Sea BV [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Name of Shareholders |  | Agip Caspian Sea BV |  |  |  |  |  |  |
% Ownership |  | 16.81% |  |  |  |  |  |  |
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Eight [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name |  | OPCO - Sociedade Operacional Angola LNG SA |  |  |  |  |  |  |
Registered office |  | Luanda (Angola) |  |  |  |  |  |  |
Country of operation |  | Angola |  |  |  |  |  |  |
Share capital | Kz |  |  |  |  |  |  |  | Kz 7,400,000 |
Method used to account for investments in subsidiaries | [1] | Co. |  |  |  |  |  |  |
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Eight [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 86.40% |  |  |  |  |  |  |
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Eight [Member] | Eni Angola Prod.BV [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Name of Shareholders |  | Eni Angola Prod.BV |  |  |  |  |  |  |
% Ownership |  | 13.60% |  |  |  |  |  |  |
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Nine [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name |  | Petrolera Güiria SA |  |  |  |  |  |  |
Registered office |  | Caracas (Venezuela) |  |  |  |  |  |  |
Country of operation |  | Venezuela |  |  |  |  |  |  |
Share capital | |  |  |  |  |  |  | 1,000,000 |  |
Method used to account for investments in subsidiaries | [1] | Co. |  |  |  |  |  |  |
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Nine [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 80.50% |  |  |  |  |  |  |
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Nine [Member] | Eni Venezuela BV [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Name of Shareholders |  | Eni Venezuela BV |  |  |  |  |  |  |
% Ownership |  | 19.50% |  |  |  |  |  |  |
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Ten [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name |  | Point Fortin LNG Exports Ltd |  |  |  |  |  |  |
Registered office |  | Port of Spain (Trinidad and Tobago) |  |  |  |  |  |  |
Country of operation |  | Trinidad and Tobago |  |  |  |  |  |  |
Share capital |  |  |  | $ 10,000 |  |  |  |  |
Method used to account for investments in subsidiaries | [1] | Co. |  |  |  |  |  |  |
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Ten [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 82.69% |  |  |  |  |  |  |
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Ten [Member] | Eni T&T Ltd [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Name of Shareholders |  | Eni T&T Ltd |  |  |  |  |  |  |
% Ownership |  | 17.31% |  |  |  |  |  |  |
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Eleven [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name |  | SOMG - Sociedade de Operações e Manutenção de Gasodutos SA |  |  |  |  |  |  |
Registered office |  | Luanda (Angola) |  |  |  |  |  |  |
Country of operation |  | Angola |  |  |  |  |  |  |
Share capital | Kz |  |  |  |  |  |  |  | Kz 7,400,000 |
Method used to account for investments in subsidiaries | [1] | Co. |  |  |  |  |  |  |
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Eleven [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 86.40% |  |  |  |  |  |  |
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Eleven [Member] | Eni Angola Prod.BV [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Name of Shareholders |  | Eni Angola Prod.BV |  |  |  |  |  |  |
% Ownership |  | 13.60% |  |  |  |  |  |  |
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Twelve [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name |  | Torsina Oil Co |  |  |  |  |  |  |
Registered office |  | Cairo (Egypt) |  |  |  |  |  |  |
Country of operation |  | Egypt |  |  |  |  |  |  |
Share capital | ج.م. |  |  |  |  |  | ج.م. 20,000 |  |  |
Method used to account for investments in subsidiaries | [1] | Co. |  |  |  |  |  |  |
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Twelve [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Name of Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 87.50% |  |  |  |  |  |  |
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Twelve [Member] | Ieoc Production BV [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Name of Shareholders |  | Ieoc Production BV |  |  |  |  |  |  |
% Ownership |  | 12.50% |  |  |  |  |  |  |
[1] | Jointly controlled entity.
[2] | Shares without nominal value.

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