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Other information about investments (Details 4) | 12 Months Ended |  |
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Dec. 31, 2018 EUR (€) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 GBP (£) | Dec. 31, 2018 EGP (ج.م.) | Dec. 31, 2018 VEF ( ) | Dec. 31, 2018 KZT (₸) | Dec. 31, 2018 KWD (د.ك) | Dec. 31, 2018 MZN (MT) | Dec. 31, 2018 AED (د.إ) | Dec. 31, 2017 EUR (€)
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Share capital | € |  | € 4,005,000,000 |  |  |  |  |  |  |  |  | € 4,005,000,000
In Italy [Member] | Exploration and Productions [Member] | Subsidiaries One [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name | [1] | Mozambique Rovuma Venture SpA (†) |  |  |  |  |  |  |  |  |
Registered office |  | San Donato Milanese (MI) |  |  |  |  |  |  |  |  |
Country of operation |  | Mozambique |  |  |  |  |  |  |  |  |
Share capital | € |  | € 20,000,000 |  |  |  |  |  |  |  |  |
% Equity ratio |  | 35.71% |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | J.O. |  |  |  |  |  |  |  |  |
In Italy [Member] | Exploration and Productions [Member] | Subsidiaries One [Member] | ENI SPA [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |  |  |  |  |
% Ownership |  | 35.71% |  |  |  |  |  |  |  |  |
In Italy [Member] | Exploration and Productions [Member] | Subsidiaries One [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |
% Ownership |  | 64.29% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries One [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name | [1] | Agiba Petroleum Co (†) |  |  |  |  |  |  |  |  |
Registered office |  | Cairo (Egypt) |  |  |  |  |  |  |  |  |
Country of operation |  | Egypt |  |  |  |  |  |  |  |  |
Share capital | ج.م. |  |  |  |  | ج.م. 20,000 |  |  |  |  |  |
Consolidation or valutation method | [1] | Co. |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries One [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third partie |  |  |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries One [Member] | Ieoc Production BV [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Ieoc Production BV |  |  |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Two [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | Angola LNG Ltd |  |  |  |  |  |  |  |  |
Registered office |  | Hamilton (Bermuda) |  |  |  |  |  |  |  |  |
Country of operation |  | Angola |  |  |  |  |  |  |  |  |
Share capital |  |  | $ 10,082,000,000 |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Two [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |
% Ownership |  | 86.40% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Two [Member] | Eni Angola Prod BV [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni Angola Prod.BV |  |  |  |  |  |  |  |  |
% Ownership |  | 13.60% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Three [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | Ashrafi Island Petroleum Co |  |  |  |  |  |  |  |  |
Registered office |  | Cairo (Egypt) |  |  |  |  |  |  |  |  |
Country of operation |  | Egypt |  |  |  |  |  |  |  |  |
Share capital | ج.م. |  |  |  |  | 20,000 |  |  |  |  |  |
Consolidation or valutation method | [1] | Co. |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Three [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |
% Ownership |  | 75.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Three [Member] | Ieoc Production BV [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Ieoc Production BV |  |  |  |  |  |  |  |  |
% Ownership |  | 25.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Four [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name | [1] | Barentsmorneftegaz Sàrl(†) |  |  |  |  |  |  |  |  |
Registered office |  | Luxembourg (Luxembourg) |  |  |  |  |  |  |  |  |
Country of operation |  | Russia |  |  |  |  |  |  |  |  |
Share capital |  |  | 20,000 |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Four [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |
% Ownership |  | 66.67% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Four [Member] | Eni Energy Russia BV [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni Energy Russia BV |  |  |  |  |  |  |  |  |
% Ownership |  | 33.33% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Five [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name | [1] | Cabo Delgado Gas Development Limitada(†) |  |  |  |  |  |  |  |  |
Registered office |  | Maputo (Mozambique) |  |  |  |  |  |  |  |  |
Country of operation |  | Mozambique |  |  |  |  |  |  |  |  |
Share capital | MT |  |  |  |  |  |  |  |  | MT 2,500,000 |  |
Consolidation or valutation method | [1] | Co. |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Five [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Five [Member] | Eni MozamLNG HBV [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni Mozam.LNG H. BV |  |  |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Six [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name | [1] | Cardón IV SA(†) |  |  |  |  |  |  |  |  |
Registered office |  | Caracas (Venezuela) |  |  |  |  |  |  |  |  |
Country of operation |  | Venezuela |  |  |  |  |  |  |  |  |
Share capital | |  |  |  |  |  | 172.1 |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Six [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Six [Member] | Eni Venezuela BV [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni Venezuela BV |  |  |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Seven [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | Compañia Agua Plana SA |  |  |  |  |  |  |  |  |
Registered office |  | Caracas (Venezuela) |  |  |  |  |  |  |  |  |
Country of operation |  | Venezuela |  |  |  |  |  |  |  |  |
Share capital | |  |  |  |  |  | 0.001 |  |  |  |  |
Consolidation or valutation method | [1] | Co. |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Seven [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |
% Ownership |  | 74.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Seven [Member] | Eni Venezuela BV [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni Venezuela BV |  |  |  |  |  |  |  |  |
% Ownership |  | 26.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Eight [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | Coral FLNG SA |  |  |  |  |  |  |  |  |
Registered office |  | Maputo (Mozambique) |  |  |  |  |  |  |  |  |
Country of operation |  | Mozambique |  |  |  |  |  |  |  |  |
Share capital | MT |  |  |  |  |  |  |  |  | MT 100,000,000 |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Eight [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |
% Ownership |  | 75.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Eight [Member] | Eni MozamLNG HBV [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni Mozam.LNG H. BV |  |  |  |  |  |  |  |  |
% Ownership |  | 25.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Nine [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | Coral South FLNG DMCC |  |  |  |  |  |  |  |  |
Registered office |  | Dubai (United Arab Emirates) |  |  |  |  |  |  |  |  |
Country of operation |  | United Arab Emirates |  |  |  |  |  |  |  |  |
Share capital | د.إ |  |  |  |  |  |  |  |  |  | د.إ 500,000 |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Nine [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |
% Ownership |  | 75.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Nine [Member] | Eni MozamLNG HBV [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni Mozam.LNG H. BV |  |  |  |  |  |  |  |  |
% Ownership |  | 25.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Ten [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | East Delta Gas Co (in liquidation) |  |  |  |  |  |  |  |  |
Registered office |  | Cairo (Egypt) |  |  |  |  |  |  |  |  |
Country of operation |  | Egypt |  |  |  |  |  |  |  |  |
Share capital | ج.م. |  |  |  |  | 20,000 |  |  |  |  |  |
Consolidation or valutation method | [1] | Co. |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Ten [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |
% Ownership |  | 62.50% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Ten [Member] | Ieoc Production BV [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Ieoc Production BV |  |  |  |  |  |  |  |  |
% Ownership |  | 37.50% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Eleven [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name | [1] | East Kanayis Petroleum Co(†) |  |  |  |  |  |  |  |  |
Registered office |  | Cairo (Egypt) |  |  |  |  |  |  |  |  |
Country of operation |  | Egypt |  |  |  |  |  |  |  |  |
Share capital | ج.م. |  |  |  |  | 20,000 |  |  |  |  |  |
Consolidation or valutation method | [1] | Co. |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Eleven [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Eleven [Member] | Ieoc Production BV [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Ieoc Production BV |  |  |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twelve [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name | [1] | East Obaiyed Petroleum Company(†) |  |  |  |  |  |  |  |  |
Registered office |  | Cairo (Egypt) |  |  |  |  |  |  |  |  |
Country of operation |  | Egypt |  |  |  |  |  |  |  |  |
Share capital | ج.م. |  |  |  |  | 20,000 |  |  |  |  |  |
Consolidation or valutation method | [1] | Co. |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twelve [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twelve [Member] | Ieoc SpA [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Ieoc SpA |  |  |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirteen [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | El Temsah Petroleum Co |  |  |  |  |  |  |  |  |
Registered office |  | Cairo (Egypt) |  |  |  |  |  |  |  |  |
Country of operation |  | Egypt |  |  |  |  |  |  |  |  |
Share capital | ج.م. |  |  |  |  | 20,000 |  |  |  |  |  |
Consolidation or valutation method | [1] | Co. |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirteen [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |
% Ownership |  | 75.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirteen [Member] | Ieoc Production BV [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Ieoc Production BV |  |  |  |  |  |  |  |  |
% Ownership |  | 25.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Fourteen [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name | [1] | El-Fayrouz Petroleum Co(†) (in liquidation) |  |  |  |  |  |  |  |  |
Registered office |  | Cairo (Egypt) |  |  |  |  |  |  |  |  |
Country of operation |  | Egypt |  |  |  |  |  |  |  |  |
Share capital | ج.م. |  |  |  |  | ج.م. 20,000 |  |  |  |  |  |
Consolidation or valutation method | [1] | Co. |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Fourteen [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Fourteen [Member] | Ieoc Exploration BV [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Ieoc Exploration BV |  |  |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Fifteen [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name | [1] | Fedynskmorneftegaz Sàrl(†) |  |  |  |  |  |  |  |  |
Registered office |  | Luxembourg (Luxembourg) |  |  |  |  |  |  |  |  |
Country of operation |  | Russia |  |  |  |  |  |  |  |  |
Share capital |  |  | 20,000 |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Fifteen [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |
% Ownership |  | 66.67% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Fifteen [Member] | Eni Energy Russia BV [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni Energy Russia BV |  |  |  |  |  |  |  |  |
% Ownership |  | 33.33% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Sixteen [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name | [1] | Isatay Operating Company Llp(†) |  |  |  |  |  |  |  |  |
Registered office |  | Astana (Kazakhstan) |  |  |  |  |  |  |  |  |
Country of operation |  | Kazakhstan |  |  |  |  |  |  |  |  |
Share capital | ₸ |  |  |  |  |  |  | ₸ 400,000 |  |  |  |
Consolidation or valutation method | [1] | Co. |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Sixteen [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Sixteen [Member] | Eni Isatay BV [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni Isatay BV |  |  |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Seventeen [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | Karachaganak Petroleum Operating BV |  |  |  |  |  |  |  |  |
Registered office |  | Amsterdam (Netherlands) |  |  |  |  |  |  |  |  |
Country of operation |  | Kazakhstan |  |  |  |  |  |  |  |  |
Share capital | € |  | € 20,000 |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | Co. |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Seventeen [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |
% Ownership |  | 70.75% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Seventeen [Member] | Agip KarachagBV [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Agip Karachag.BV |  |  |  |  |  |  |  |  |
% Ownership |  | 29.25% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Eighteen [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | Karachaganak Project Development Ltd (KPD) |  |  |  |  |  |  |  |  |
Registered office |  | Reading, Berkshire (United Kingdom) |  |  |  |  |  |  |  |  |
Country of operation |  | United Kingdom |  |  |  |  |  |  |  |  |
Share capital | £ |  |  |  | £ 100 |  |  |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Eighteen [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |
% Ownership |  | 62.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Eighteen [Member] | Agip KarachagBV [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Agip Karachag.BV |  |  |  |  |  |  |  |  |
% Ownership |  | 38.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Nineteen [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | Khaleej Petroleum Co Wll |  |  |  |  |  |  |  |  |
Registered office |  | Safat (Kuwait) |  |  |  |  |  |  |  |  |
Country of operation |  | Kuwait |  |  |  |  |  |  |  |  |
Share capital | د.ك |  |  |  |  |  |  |  | د.ك 250,000 |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Nineteen [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |
% Ownership |  | 51.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Nineteen [Member] | Eni Middle E Ltd [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni Middle E. Ltd |  |  |  |  |  |  |  |  |
% Ownership |  | 49.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twenty [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | Liberty National Development Co Llc |  |  |  |  |  |  |  |  |
Registered office |  | Wilmington (USA) |  |  |  |  |  |  |  |  |
Country of operation |  | USA |  |  |  |  |  |  |  |  |
Share capital | [2] |  | 0 |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twenty [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |
% Ownership |  | 67.50% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twenty [Member] | Eni Oil & Gas Inc [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni Oil & Gas Inc |  |  |  |  |  |  |  |  |
% Ownership |  | 32.50% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twenty One [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | Mediterranean Gas Co |  |  |  |  |  |  |  |  |
Registered office |  | Cairo (Egypt) |  |  |  |  |  |  |  |  |
Country of operation |  | Egypt |  |  |  |  |  |  |  |  |
Share capital |  |  | 20,000 |  |  |  |  |  |  |  |
Shareholders |  | Ieoc Production BV Third parties |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twenty One [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 75.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twenty One [Member] | Ieoc Production BV [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 25.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twenty Two [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name | [1] | Mellitah Oil & Gas BV(†) |  |  |  |  |  |  |  |  |
Registered office |  | Amsterdam (Netherlands) |  |  |  |  |  |  |  |  |
Country of operation |  | Libya |  |  |  |  |  |  |  |  |
Share capital |  |  | 20,000 |  |  |  |  |  |  |  |
Shareholders |  | Eni North Africa BV Third parties |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twenty Two [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twenty Two [Member] | Eni North Africa BV [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twenty Three [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | Nile Delta Oil Co Nidoco |  |  |  |  |  |  |  |  |
Registered office |  | Cairo (Egypt) |  |  |  |  |  |  |  |  |
Country of operation |  | Egypt |  |  |  |  |  |  |  |  |
Share capital |  |  | 20,000 |  |  |  |  |  |  |  |
Shareholders |  | Ieoc Production BV Third parties |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twenty Three [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 62.50% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twenty Three [Member] | Ieoc Production BV [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 37.50% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twenty Four [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | Norpipe Terminal Holdco Ltd |  |  |  |  |  |  |  |  |
Registered office |  | London (United Kingdom) |  |  |  |  |  |  |  |  |
Country of operation |  | Norway |  |  |  |  |  |  |  |  |
Share capital |  |  | 55.69 |  |  |  |  |  |  |  |
Shareholders |  | Eni SpA Third parties |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twenty Four [Member] | ENI SPA [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 14.20% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twenty Four [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 85.80% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twenty Five [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | Norsea Pipeline Ltd |  |  |  |  |  |  |  |  |
Registered office |  | Woking Surrey (United Kingdom) |  |  |  |  |  |  |  |  |
Country of operation |  | Egypt |  |  |  |  |  |  |  |  |
Share capital |  |  | 20,000 |  |  |  |  |  |  |  |
Shareholders |  | Ieoc Exploration BV Third parties |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twenty Five [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 70.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twenty Five [Member] | Ieoc Exploration BV [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 30.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | SubsidiariesTwenty Six [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | North Bardawil Petroleum Co (in liquidation) |  |  |  |  |  |  |  |  |
Registered office |  | Cairo (Egypt) |  |  |  |  |  |  |  |  |
Country of operation |  | Egypt |  |  |  |  |  |  |  |  |
Share capital |  |  | 20,000 |  |  |  |  |  |  |  |
Shareholders |  | Ieoc SpA Third parties |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | SubsidiariesTwenty Six [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 75.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | SubsidiariesTwenty Six [Member] | Ieoc SpA [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 25.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | SubsidiariesTwenty Seven [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | North El Burg Petroleum Co |  |  |  |  |  |  |  |  |
Registered office |  | Cairo (Egypt) |  |  |  |  |  |  |  |  |
Country of operation |  | Egypt |  |  |  |  |  |  |  |  |
Share capital |  |  | 20,000 |  |  |  |  |  |  |  |
Shareholders |  | Ieoc Production BV Third parties |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | SubsidiariesTwenty Seven [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | SubsidiariesTwenty Seven [Member] | Ieoc Production BV [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | SubsidiariesTwenty Eight [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name | [1] | Petrobel Belayim Petroleum Co(†) |  |  |  |  |  |  |  |  |
Registered office |  | Caracas (Venezuela) |  |  |  |  |  |  |  |  |
Country of operation |  | Venezuela |  |  |  |  |  |  |  |  |
Share capital |  |  | 3,790 |  |  |  |  |  |  |  |
Shareholders |  | Eni Lasmo Plc Third parties |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | SubsidiariesTwenty Eight [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 60.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | SubsidiariesTwenty Eight [Member] | Eni Lasmo Plc [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 40.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | SubsidiariesTwenty Nine [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name | [1] | PetroBicentenario SA(†) |  |  |  |  |  |  |  |  |
Registered office |  | Caracas (Venezuela) |  |  |  |  |  |  |  |  |
Country of operation |  | Venezuela |  |  |  |  |  |  |  |  |
Share capital |  |  | 24,021 |  |  |  |  |  |  |  |
Shareholders |  | Eni Lasmo Plc Third parties |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | SubsidiariesTwenty Nine [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 60.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | SubsidiariesTwenty Nine [Member] | Eni Lasmo Plc [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 40.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name | [1] | PetroJunín SA(†) |  |  |  |  |  |  |  |  |
Registered office |  | Caracas (Venezuela) |  |  |  |  |  |  |  |  |
Country of operation |  | Venezuela |  |  |  |  |  |  |  |  |
Share capital |  |  | 2,203 |  |  |  |  |  |  |  |
Shareholders |  | Eni Venezuela BV Third parties |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 74.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty [Member] | Eni Venezuela BV [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 26.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty One [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | PetroSucre SA |  |  |  |  |  |  |  |  |
Registered office |  | Cairo (Egypt) |  |  |  |  |  |  |  |  |
Country of operation |  | Egypt |  |  |  |  |  |  |  |  |
Share capital |  |  | 20,000 |  |  |  |  |  |  |  |
Shareholders |  | Ieoc Production BV Third parties |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty One [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 75.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty One [Member] | Ieoc Production BV [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 25.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty Two [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | Pharaonic Petroleum Co |  |  |  |  |  |  |  |  |
Registered office |  | Sandnes (Norway) |  |  |  |  |  |  |  |  |
Country of operation |  | Norway |  |  |  |  |  |  |  |  |
Share capital |  |  | 60,000 |  |  |  |  |  |  |  |
Shareholders |  | Vår Energi AS |  |  |  |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty Three [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | Point Resources FPSO Holding AS |  |  |  |  |  |  |  |  |
Registered office |  | Sandnes (Norway) |  |  |  |  |  |  |  |  |
Country of operation |  | Norway |  |  |  |  |  |  |  |  |
Share capital |  |  | 150,100,000 |  |  |  |  |  |  |  |
Shareholders |  | PR FPSO Holding AS |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty Three [Member] | PR FPSO AS [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty Three [Member] | Holding As [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 5.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty Four [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | Point Resources FPSO Holding AS |  |  |  |  |  |  |  |  |
Registered office |  | Sandnes (Norway) |  |  |  |  |  |  |  |  |
Country of operation |  | Norway |  |  |  |  |  |  |  |  |
Share capital |  |  | 0 |  |  |  |  |  |  |  |
Shareholders |  | PR FPSO AS PR FPSO Holding AS |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | SubsidiariesThirty Five [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | PR Jotun DA |  |  |  |  |  |  |  |  |
Registered office |  | Cairo (Egypt) |  |  |  |  |  |  |  |  |
Country of operation |  | Egypt |  |  |  |  |  |  |  |  |
Share capital |  |  | 20,000 |  |  |  |  |  |  |  |
Shareholders |  | Ieoc Production BV Third parties |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | SubsidiariesThirty Five [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | SubsidiariesThirty Five [Member] | Ieoc Production BV [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty Six [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name | [1] | Port Said Petroleum Co(†) |  |  |  |  |  |  |  |  |
Registered office |  | Cairo (Egypt) |  |  |  |  |  |  |  |  |
Country of operation |  | Egypt |  |  |  |  |  |  |  |  |
Share capital |  |  | 20,000 |  |  |  |  |  |  |  |
Shareholders |  | Ieoc Production BV Third parties |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty Six [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 77.50% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty Six [Member] | Ieoc Production BV [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 22.50% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty Seven [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | Raml Petroleum Co |  |  |  |  |  |  |  |  |
Registered office |  | Cairo (Egypt) |  |  |  |  |  |  |  |  |
Country of operation |  | Egypt |  |  |  |  |  |  |  |  |
Share capital |  |  | 20,000 |  |  |  |  |  |  |  |
Shareholders |  | Ieoc Production BV Third parties |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty Seven [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 62.50% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty Seven [Member] | Ieoc Production BV [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 37.50% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty Eight [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | Ras Qattara Petroleum Co |  |  |  |  |  |  |  |  |
Registered office |  | Maputo (Mozambique) |  |  |  |  |  |  |  |  |
Country of operation |  | Mozambique |  |  |  |  |  |  |  |  |
Share capital |  |  | 140,000 |  |  |  |  |  |  |  |
Shareholders |  | Mozamb. Rov. V. SpA Third parties |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty Eight [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 66.67% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty Eight [Member] | Mozamb Rov V SpA [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 33.33% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty Nine [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name | [1] | Rovuma Basin LNG Land Limitada(†) |  |  |  |  |  |  |  |  |
Registered office |  | Cairo (Egypt) |  |  |  |  |  |  |  |  |
Country of operation |  | Egypt |  |  |  |  |  |  |  |  |
Share capital |  |  | 20,000 |  |  |  |  |  |  |  |
Shareholders |  | Ieoc Production BV Third parties |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty Nine [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 75.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty Nine [Member] | Ieoc Production BV [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 25.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | Shorouk Petroleum Company |  |  |  |  |  |  |  |  |
Registered office |  | Pointe-Noire (Republic of theCongo) |  |  |  |  |  |  |  |  |
Country of operation |  | Republic of the Congo |  |  |  |  |  |  |  |  |
Share capital |  |  | 44,732,000,000 |  |  |  |  |  |  |  |
Shareholders |  | Eni Congo SA Third parties |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 80.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty [Member] | Eni Congo SA [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 20.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty One [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | Societe Centrale Electrique du Congo SA |  |  |  |  |  |  |  |  |
Country of operation |  | Tunisia |  |  |  |  |  |  |  |  |
Share capital |  |  | 5,000,000 |  |  |  |  |  |  |  |
Shareholders |  | Eni Tunisia BV Third parties |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty One [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty One [Member] | Eni Tunisia BV [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Two [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name | [1] | Societe Italo Tunisienne d Exploitation Petroliere SA |  |  |  |  |  |  |  |  |
Registered office |  | Tunisi (Tunisia) |  |  |  |  |  |  |  |  |
Country of operation |  | Tunisia |  |  |  |  |  |  |  |  |
Share capital |  |  | 100,000 |  |  |  |  |  |  |  |
Shareholders |  | Eni Tunisia BV Third parties |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Two [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Two [Member] | Eni Tunisia BV [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Three [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name | [1] | Sodeps - Société de Developpement et d’Exploitation du Permis du Sud SA(†) |  |  |  |  |  |  |  |  |
Registered office |  | Istanbul (Turkey) |  |  |  |  |  |  |  |  |
Country of operation |  | Turkey |  |  |  |  |  |  |  |  |
Share capital |  |  | 9,850,000 |  |  |  |  |  |  |  |
Shareholders |  | Eni International BV Third parties |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Three [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Three [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Four [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | Tapco Petrol Boru Hatti Sanayi ve Ticaret AS(†) (in liquidation) |  |  |  |  |  |  |  |  |
Registered office |  | Aksai (Kazakhstan) |  |  |  |  |  |  |  |  |
Country of operation |  | Kazakhstan |  |  |  |  |  |  |  |  |
Share capital |  |  | 29,478,455 |  |  |  |  |  |  |  |
Shareholders |  | EniProgetti SpA Third parties |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Four [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 51.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Four [Member] | Eni Progetti SpA [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 49.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Five [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name | [1] | Tecninco Engineering Contractors Llp(†) |  |  |  |  |  |  |  |  |
Registered office |  | Cairo (Egypt) |  |  |  |  |  |  |  |  |
Country of operation |  | Egypt |  |  |  |  |  |  |  |  |
Share capital |  |  | 20,000 |  |  |  |  |  |  |  |
Shareholders |  | Ieoc Exploration BV Third parties |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Five [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 75.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Five [Member] | Ieoc Exploration BV [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 25.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Six [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | Thekah Petroleum Co (in liquidation) |  |  |  |  |  |  |  |  |
Registered office |  | Cairo (Egypt) |  |  |  |  |  |  |  |  |
Country of operation |  | Egypt |  |  |  |  |  |  |  |  |
Share capital |  |  | 153,000,000 |  |  |  |  |  |  |  |
Shareholders |  | Eni International BV Third parties |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Six [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 66.67% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Six [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 33.33% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Seven [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | United Gas Derivatives Co |  |  |  |  |  |  |  |  |
Registered office |  | London (United Kingdom) |  |  |  |  |  |  |  |  |
Country of operation |  | Indonesia |  |  |  |  |  |  |  |  |
Share capital |  |  | 1,315,912 |  |  |  |  |  |  |  |
Shareholders |  | Eni Lasmo Plc Third parties |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Seven [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Seven [Member] | Eni Lasmo Plc [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Eight [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name | [1] | VIC CBM Ltd |  |  |  |  |  |  |  |  |
Registered office |  | London (United Kingdom) |  |  |  |  |  |  |  |  |
Country of operation |  | Indonesia |  |  |  |  |  |  |  |  |
Share capital |  |  | 631,640 |  |  |  |  |  |  |  |
Shareholders |  | Eni Lasmo Plc Third parties |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Eight [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Eight [Member] | Eni Lasmo Plc [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Nine [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name | [1] | Virginia Indonesia Co CBM Ltd(†) |  |  |  |  |  |  |  |  |
Registered office |  | Forus (Norway) |  |  |  |  |  |  |  |  |
Country of operation |  | Norway |  |  |  |  |  |  |  |  |
Share capital |  |  | 399,425,000 |  |  |  |  |  |  |  |
Shareholders |  | Eni International BV Third parties |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Nine [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 30.40% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Nine [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 69.60% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Fifty [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name | [1] | Vår Energi AS(†) (former Eni Norge AS) |  |  |  |  |  |  |  |  |
Registered office |  | Cairo (Egypt) |  |  |  |  |  |  |  |  |
Country of operation |  | Egypt |  |  |  |  |  |  |  |  |
Share capital |  |  | $ 20,000 |  |  |  |  |  |  |  |
Shareholders |  | Ieoc Exploration BV Third parties |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Fifty [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Fifty [Member] | Ieoc Exploration BV [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 50.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Fifty One [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |
Company name | [1] | West Ashrafi Petroleum Co(†) (in liquidation) |  |  |  |  |  |  |  |  |
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