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Other information about investments - Principal joint ventures, joint operations and associates (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Var Energi AS |  |  |
Disclosure of detailed information about investments |  |  |
Company name | Vår Energi AS |  |
Registered office | Forus (Norway) |  |
Country of operation | Norway |  |
Business segment | Exploration & Production |  |
% ownership interest | 69.85% |  | 69.60%
Eni's % of the investment | 69.85% | 69.60% |
Saipem SpA |  |  |
Disclosure of detailed information about investments |  |  |
Company name | Saipem SpA |  |
Registered office | San Donato Milanese (MI) (Italy) |  |
Country of operation | Italy |  |
Business segment | Corporate and financial companies |  |
% ownership interest | 30.54% |  |
Eni's % of the investment | 31.08% | 30.99% |
Union Fenosa Gas SA |  |  |
Disclosure of detailed information about investments |  |  |
Company name | Unión Fenosa Gas SA |  |
Registered office | Madrid (Spain) |  |
Country of operation | Spain |  |
Business segment | Global Gas & LNG Portfolio |  |
% ownership interest | 50.00% |  |
Eni's % of the investment | 50.00% | 50.00% |
Cardon IV SA |  |  |
Disclosure of detailed information about investments |  |  |
Company name | Cardón IV SA |  |
Registered office | Caracas (Venezuela) |  |
Country of operation | Venezuela |  |
Business segment | Exploration & Production |  |
% ownership interest | 50.00% |  |
Eni's % of the investment | 50.00% | 50.00% |
Gas Distribution Company of Thessaloniki Thessaly SA |  |  |
Disclosure of detailed information about investments |  |  |
Company name | Gas Distribution Company of Thessaloniki - Thessaly SA |  |
Registered office | Ampelokipi- Menemeni (Greece) |  |
Country of operation | Greece |  |
Business segment | Eni gas e luce |  |
% ownership interest | 49.00% |  |
Eni's % of the investment | 49.00% | 49.00% |
Abu Dhabi Oil Refining Co |  |  |
Disclosure of detailed information about investments |  |  |
Company name | Abu Dhabi Oil Refining Co (Takreer) |  |
Registered office | Abu Dhabi (United Arab Emirates) |  |
Country of operation | United Arab Emirates |  |
Business segment | Refining & Marketing |  |
% ownership interest | 20.00% |  |
Eni's % of the investment | 20.00% | 20.00% |
Angola LNG Ltd |  |  |
Disclosure of detailed information about investments |  |  |
Company name | Angola LNG Ltd |  |
Registered office | Hamilton (Bermuda) |  |
Country of operation | Angola |  |
Business segment | Exploration & Production |  |
% ownership interest | 13.60% |  |
Eni's % of the investment | 13.60% | 13.60% |
Coral FLNG SA |  |  |
Disclosure of detailed information about investments |  |  |
Company name | Coral FLNG SA |  |
Registered office | Maputo (Mozambique) |  |
Country of operation | Mozambique |  |
Business segment | Exploration & Production |  |
% ownership interest | 25.00% |  |
Eni's % of the investment | 25.00% | 25.00% |
Mozambique Rovuma Venture SpA |  |  |
Disclosure of detailed information about investments |  |  |
Company name | Mozambique Rovuma Venture SpA |  |
Registered office | San Donato Milanese (MI) (Italy) |  |
Country of operation | Mozambique |  |
Business segment | Exploration & Production |  |
% ownership interest | 35.71% |  |
Eni's % of the investment | 35.71% |  |
GreenStream BV |  |  |
Disclosure of detailed information about investments |  |  |
Company name | GreenStream BV |  |
Registered office | Amsterdam (Netherlands) |  |
Country of operation | Libya |  |
Business segment | Global Gas & LNG Portfolio |  |
% ownership interest | 50.00% |  |
Eni's % of the investment | 50.00% |  |

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