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Other information about investments (Details 6) | 12 Months Ended |  |
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Dec. 31, 2018 EUR (€) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 CHF (SFr) | Dec. 31, 2018 EGP (ج.م.) | Dec. 31, 2018 VEF ( ) | Dec. 31, 2018 TND (د.ت) | Dec. 31, 2018 SGD ($) | Dec. 31, 2017 EUR (€)
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Share capital |  | € 4,005,000,000 |  |  |  |  |  |  | € 4,005,000,000
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries One [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name | [1] | Arezzo Gas SpA |  |  |  |  |  |  |
Registered office |  | San Donato Milanese (MI) |  |  |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |  |  |
Share capital |  | € 52,000,000 | $ 394,000 |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries One [Member] | Eni Fuel SpA [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Eni Fuel SpA |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries One [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries One [Member] | ENI SPA [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries One [Member] | Arezzo Gas SpA [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Registered office |  | Arezzo |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Two [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name |  | CePIM Centro Padano Interscambio Merci SpA |  |  |  |  |  |  |
Registered office |  | Rome |  |  |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |  |  |
Share capital |  | € 58,944,310 | 6,642,928.32 |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Two [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 55.22% |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Two [Member] | Ecofuel SpA [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Ecofuel SpA |  |  |  |  |  |  |
% Ownership |  | 44.78% |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Two [Member] | ENI SPA [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Two [Member] | CePIM Centro Padano Interscambio Merci SpA [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Registered office |  | Fontevivo (PR) |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Three [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name |  | Consorzio Operatori GPL di Napoli |  |  |  |  |  |  |
Registered office |  | Gela (CL) |  |  |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |  |  |
Share capital |  | € 15,000,000 | 102,000 |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |
Consolidation or valutation method | [1] | Co. |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Three [Member] | Eni Fuel SpA [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Eni Fuel SpA |  |  |  |  |  |  |
% Ownership |  | 25.00% |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Three [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 75.00% |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Three [Member] | ENI SPA [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Three [Member] | Consorzio Operatori GPL di Napoli [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Registered office |  | Napoli |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Four [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name | [1] | Costiero Gas Livorno SpA |  |  |  |  |  |  |
Registered office |  | Genova |  |  |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |  |  |
Share capital |  | € 12,400,000 | 26,000,000 |  |  |  |  |  |
% Equity ratio |  | 65.00% |  |  |  |  |  |  |
Consolidation or valutation method | [1] | J.O. |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Four [Member] | Eni Fuel SpA [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Eni Fuel SpA |  |  |  |  |  |  |
% Ownership |  | 65.00% |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Four [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 35.00% |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Four [Member] | Ecofuel SpA [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Ecofuel SpA |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Four [Member] | Costiero Gas Liv SpA [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Registered office |  | Livorno |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Five [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name |  | Disma SpA |  |  |  |  |  |  |
Registered office |  | Rome |  |  |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |  |  |
Share capital |  | € 13,580,000.20 | 2,600,000 |  |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Five [Member] | Eni Fuel SpA [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Eni Fuel SpA |  |  |  |  |  |  |
% Ownership |  | 25.00% |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Five [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 75.00% |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Five [Member] | ENI SPA [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Five [Member] | Disma SpA [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Registered office |  | Segrate (MI) |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Six [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name |  | Livorno LNG Terminal SpA |  |  |  |  |  |  |
Registered office |  | Livorno |  |  |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |  |  |
Share capital | $ |  |  | 200,000 |  |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Six [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Six [Member] | Costiero Gas Liv SpA [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Costiero Gas Liv. SpA |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Seven [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name | [1] | Petroven Srl |  |  |  |  |  |  |
Registered office |  | Genova |  |  |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |  |  |
Share capital | $ |  |  | 156,000 |  |  |  |  |  |
% Equity ratio |  | 68.00% |  |  |  |  |  |  |
Consolidation or valutation method | [1] | J.O. |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Seven [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 32.00% |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Seven [Member] | Ecofuel SpA [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Ecofuel SpA |  |  |  |  |  |  |
% Ownership |  | 68.00% |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eight [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name |  | Porto Petroli di Genova SpA |  |  |  |  |  |  |
Registered office |  | Genova |  |  |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |  |  |
Share capital | $ |  |  | 2,068,000 |  |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eight [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 59.50% |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eight [Member] | Ecofuel SpA [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Ecofuel SpA |  |  |  |  |  |  |
% Ownership |  | 40.50% |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Nine [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name | [1] | Raffineria di Milazzo ScpA |  |  |  |  |  |  |
Registered office |  | Milazzo (ME) |  |  |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |  |  |
Share capital | $ |  |  | 171,143,000 |  |  |  |  |  |
% Equity ratio |  | 50.00% |  |  |  |  |  |  |
Consolidation or valutation method | [1] | J.O. |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Nine [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Nine [Member] | ENI SPA [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Ten [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name |  | Seram SpA |  |  |  |  |  |  |
Registered office |  | Fiumicino (RM) |  |  |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |  |  |
Share capital | $ |  |  | 852,000 |  |  |  |  |  |
Consolidation or valutation method | [1] | Co. |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Ten [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 75.00% |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Ten [Member] | ENI SPA [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |  |  |
% Ownership |  | 25.00% |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eleven [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name |  | Sigea Sistema Integrato Genova Arquata SpA |  |  |  |  |  |  |
Registered office |  | Genova |  |  |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |  |  |
Share capital | $ |  |  | 3,326,900 |  |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eleven [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 65.00% |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eleven [Member] | Ecofuel SpA [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Ecofuel SpA |  |  |  |  |  |  |
% Ownership |  | 35.00% |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Twelve [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name | [1] | Societa Italiana Oleodotti di Gaeta SpA |  |  |  |  |  |  |
Registered office |  | San Donato Milanese (MI) |  |  |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |  |  |
Share capital | $ |  |  | 3,085,000 |  |  |  |  |  |
% Equity ratio |  | 70.00% |  |  |  |  |  |  |
Consolidation or valutation method | [1] | J.O. |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Twelve [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 30.00% |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Twelve [Member] | ENI SPA [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |  |  |
% Ownership |  | 70.00% |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Thirteen [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name | [1] | Termica Milazzo Srl |  |  |  |  |  |  |
Registered office |  | Milazzo (ME) |  |  |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |  |  |
Share capital | $ |  |  | 100,000 |  |  |  |  |  |
% Equity ratio |  | 50.00% |  |  |  |  |  |  |
Consolidation or valutation method | [1] | J.O. |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Thirteen [Member] | Raff Milazzo ScpA [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Raff. Milazzo ScpA |  |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries One [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name | [1] | AET - Raffineriebeteiligungs gesellschaft mbH |  |  |  |  |  |  |
Registered office |  | Schwedt (Germany) |  |  |  |  |  |  |
Country of operation |  | Germany |  |  |  |  |  |  |
Share capital |  | € 27,000 |  |  |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries One [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 66.67% |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries One [Member] | Eni Deutsch GmbH [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Eni Deutsch.GmbH |  |  |  |  |  |  |
% Ownership |  | 33.33% |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Two [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name | [1] | Bayernoil Raffineriegesellschaft mbH |  |  |  |  |  |  |
Registered office |  | Vohburg (Germany) |  |  |  |  |  |  |
Country of operation |  | Germany |  |  |  |  |  |  |
Share capital |  | € 10,226,000 |  |  |  |  |  |  |
% Equity ratio |  | 20.00% |  |  |  |  |  |  |
Consolidation or valutation method | [1] | J.O. |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Two [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 80.00% |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Two [Member] | Eni Deutsch GmbH [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Eni Deutsch.GmbH |  |  |  |  |  |  |
% Ownership |  | 20.00% |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Two [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Three [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name | [1] | City Carburoil SA |  |  |  |  |  |  |
Registered office |  | Rivera (Switzerland) |  |  |  |  |  |  |
Country of operation |  | Switzerland |  |  |  |  |  |  |
Share capital | SFr |  |  |  | SFr 6,000,000 |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Three [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 50.09% |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Three [Member] | Eni Suisse SA [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Eni Suisse SA |  |  |  |  |  |  |
% Ownership |  | 49.91% |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Four [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name |  | Egyptian International Gas Technology Co |  |  |  |  |  |  |
Registered office |  | Cairo (Egypt) |  |  |  |  |  |  |
Country of operation |  | Egypt |  |  |  |  |  |  |
Share capital | ج.م. |  |  |  |  | ج.م. 100,000,000 |  |  |  |
Consolidation or valutation method | [1] | Co. |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Four [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 60.00% |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Four [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |  |  |  |
% Ownership |  | 40.00% |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Five [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name |  | ENEOS Italsing Pte Ltd |  |  |  |  |  |  |
Registered office |  | Singapore (Singapore) |  |  |  |  |  |  |
Country of operation |  | Singapore |  |  |  |  |  |  |
Share capital | $ |  |  |  |  |  |  |  | $ 12,000,000 |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Five [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 77.50% |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Five [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |  |  |  |
% Ownership |  | 22.50% |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Six [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name |  | FSH Flughafen Schwechat Hydranten- Gesellschaft OG |  |  |  |  |  |  |
Registered office |  | Amsterdam (Netherlands) |  |  |  |  |  |  |
Country of operation |  | Austria |  |  |  |  |  |  |
Share capital |  | € 20,000 |  |  |  |  |  |  |
Consolidation or valutation method | [1] | Co. |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Six [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 56.32% |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Six [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Six [Member] | Eni Market A GmbH [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Eni Market.A.GmbH |  |  |  |  |  |  |
% Ownership |  | 14.56% |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Six [Member] | Eni Mineralolh GmbH [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Eni Mineralölh.GmbH |  |  |  |  |  |  |
% Ownership |  | 14.56% |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Six [Member] | Eni Austria GmbH [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Eni Austria GmbH |  |  |  |  |  |  |
% Ownership |  | 14.56% |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Six [Member] | FSH Flughafen Schwechat Hydranten Gsellschaft OG [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Registered office |  | Wien (Austria) |  |  |  |  |  |  |
Share capital |  | € 7,798,020.99 |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Seven [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name |  | Fuelling Aviation Services GIE |  |  |  |  |  |  |
Registered office |  | Wien (Austria) |  |  |  |  |  |  |
Country of operation |  | France |  |  |  |  |  |  |
Share capital |  | € 78,500,000 |  |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |
Consolidation or valutation method | [1] | Co. |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Seven [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 75.00% |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Seven [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Seven [Member] | Eni France Sarl [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Eni France Sàrl |  |  |  |  |  |  |
% Ownership |  | 25.00% |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Seven [Member] | Fuelling Aviation Services GIE [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Registered office |  | Tremblay en France (France) |  |  |  |  |  |  |
Share capital |  | € 1 |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eight [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name |  | Mediterranee Bitumes SA |  |  |  |  |  |  |
Registered office |  | Rotterdam (Netherlands) |  |  |  |  |  |  |
Country of operation |  | Tunisia |  |  |  |  |  |  |
Share capital |  | € 1,934,040 |  |  |  |  | د.ت 1,000,000 |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eight [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 66.00% |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eight [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |  |  |  |
% Ownership |  | 34.00% |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eight [Member] | Mediterranee Bitumes SA [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Registered office |  | Tunisi (Tunisia) |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Nine [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name |  | Routex BV |  |  |  |  |  |  |
Country of operation |  | Netherlands |  |  |  |  |  |  |
Share capital |  | € 90,000,000 |  |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Nine [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 80.00% |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Nine [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |  |  |  |
% Ownership |  | 20.00% |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Nine [Member] | Eni Mineralolh GmbH [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Eni Mineralölh.GmbH |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Nine [Member] | Routex BV [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Registered office |  | Amsterdam (Netherlands) |  |  |  |  |  |  |
Share capital |  | € 67,500 |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Ten [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name |  | Saraco SA |  |  |  |  |  |  |
Registered office |  | Quito (Ecuador) |  |  |  |  |  |  |
Country of operation |  | Switzerland |  |  |  |  |  |  |
Share capital |  |  | $ 103,142.08 | SFr 420,000 |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |
Consolidation or valutation method | [1] | Co. |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Ten [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 80.00% |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Ten [Member] | Eni Suisse SA [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Eni Suisse SA |  |  |  |  |  |  |
% Ownership |  | 20.00% |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Ten [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Ten [Member] | Saraco SA [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Registered office |  | Meyrin (Switzerland) |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eleven [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name | [1] | Supermetanol CA |  |  |  |  |  |  |
Registered office |  | Lyon (France) |  |  |  |  |  |  |
Country of operation |  | Venezuela |  |  |  |  |  |  |
Share capital |  | € 56,800,000 |  |  |  | 120,867 |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |
Consolidation or valutation method | [1] | J.O. |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eleven [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 35.42% |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eleven [Member] | Ecofuel SpA [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Ecofuel SpA |  |  |  |  |  |  |
% Ownership | [2] | 34.51% |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eleven [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eleven [Member] | Supermetanol CA [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Registered office |  | Jose Puerto La Cruz (Venezuela) |  |  |  |  |  |  |
Shareholders |  | Supermetanol CA |  |  |  |  |  |  |
% Ownership |  | 30.07% |  |  |  |  |  |  |
% Equity ratio |  | 50.00% |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Twelve [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name | [1] | TBG Tanklager Betriebsgesellschaft GmbH |  |  |  |  |  |  |
Registered office |  | Alcobendas (Spain) |  |  |  |  |  |  |
Country of operation |  | Austria |  |  |  |  |  |  |
Share capital |  | € 17,299,100 |  |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Twelve [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Twelve [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Twelve [Member] | Eni Market A GmbH [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Eni Market.A.GmbH |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Twelve [Member] | TBG Tanklager [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Registered office |  | Salzburg (Austria) |  |  |  |  |  |  |
Share capital |  | € 43,603.70 |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Thirteen [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Company name |  | Weat Electronic Datenservice GmbH |  |  |  |  |  |  |
Registered office |  | Shanghai (China) |  |  |  |  |  |  |
Country of operation |  | Germany |  |  |  |  |  |  |
Share capital |  | € 409,034 |  |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Thirteen [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |
% Ownership |  | 80.00% |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Thirteen [Member] | Eni Deutsch GmbH [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Eni Deutsch.GmbH |  |  |  |  |  |  |
% Ownership |  | 20.00% |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Thirteen [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |  |  |  |
[1] | F.C. = full consolidation, J.O. = joint operation, Eq. = equity-accounted, Co. = valued at cost, F.V. = valued at fair value
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