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Other information about investments - Other significant investments - Exploration & Production (Details) | 12 Months Ended |  |
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Dec. 31, 2020 AUD ($) | Dec. 31, 2020 AOA (Kz) | Dec. 31, 2020 EGP (ج.م.) | Dec. 31, 2020 VEF ( ) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 EUR (€) | Dec. 31, 2019 EUR (€)
Other significant investments |  |  |  |  |  |  |
Share capital | € |  |  |  |  |  | € 4,005,000,000 | € 4,005,000,000
ENI SpA |  |  |  |  |  |  |
Other significant investments |  |  |  |  |  |  |
Share capital | € |  |  |  |  |  | 4,005,358,876 | € 4,005,358,876
Exploration & Production | Italy | Other significant investments One [member] |  |  |  |  |  |  |
Other significant investments |  |  |  |  |  |  |
Company name | Consorzio Universitario in Ingegneria per la Qualità e l'Innovazione |  |  |  |  |  |
Registered office | Pisa |  |  |  |  |  |
Country of operation | Italy |  |  |  |  |  |
Share capital | € |  |  |  |  |  | 136,000 |
Consolidation or valuation method | F.V. |  |  |  |  |  |
Exploration & Production | Italy | Other significant investments One [member] | ENI SpA |  |  |  |  |  |  |
Other significant investments |  |  |  |  |  |  |
% Ownership | 20.00% |  |  |  |  |  |
Exploration & Production | Italy | Other significant investments One [member] | Third parties |  |  |  |  |  |  |
Other significant investments |  |  |  |  |  |  |
% Ownership | 80.00% |  |  |  |  |  |
Exploration & Production | Foreign (outside Italy) | Other Significant Investments Three [Member] |  |  |  |  |  |  |
Other significant investments |  |  |  |  |  |  |
Company name | Administradora del Golfo de Paria Este SA |  |  |  |  |  |
Registered office | Caracas (Venezuela) |  |  |  |  |  |
Country of operation | Venezuela |  |  |  |  |  |
Share capital | |  |  |  | 0.001 |  |  |
Consolidation or valuation method | F.V. |  |  |  |  |  |
Exploration & Production | Foreign (outside Italy) | Other Significant Investments Three [Member] | Eni Venezuela BV |  |  |  |  |  |  |
Other significant investments |  |  |  |  |  |  |
% Ownership | 19.50% |  |  |  |  |  |
Exploration & Production | Foreign (outside Italy) | Other Significant Investments Three [Member] | Third parties |  |  |  |  |  |  |
Other significant investments |  |  |  |  |  |  |
% Ownership | 80.50% |  |  |  |  |  |
Exploration & Production | Foreign (outside Italy) | Other Significant Investments Four [Member] |  |  |  |  |  |  |
Other significant investments |  |  |  |  |  |  |
Company name | Brass LNG Ltd |  |  |  |  |  |
Registered office | Lagos (Nigeria) |  |  |  |  |  |
Country of operation | Nigeria |  |  |  |  |  |
Share capital | $ |  |  |  |  | $ 1,000,000 |  |
Consolidation or valuation method | F.V. |  |  |  |  |  |
Exploration & Production | Foreign (outside Italy) | Other Significant Investments Four [Member] | Third parties |  |  |  |  |  |  |
Other significant investments |  |  |  |  |  |  |
% Ownership | 79.52% |  |  |  |  |  |
Exploration & Production | Foreign (outside Italy) | Other Significant Investments Four [Member] | Eni Int. NA NV Srl [Member] |  |  |  |  |  |  |
Other significant investments |  |  |  |  |  |  |
% Ownership | 20.48% |  |  |  |  |  |
Exploration & Production | Foreign (outside Italy) | Other Significant Investments Five [Member] |  |  |  |  |  |  |
Other significant investments |  |  |  |  |  |  |
Company name | Darwin LNG Pty Ltd |  |  |  |  |  |
Registered office | West Perth (Australia) |  |  |  |  |  |
Country of operation | Australia |  |  |  |  |  |
Share capital | $ | $ 187,569,921.42 |  |  |  |  |  |
Consolidation or valuation method | F.V. |  |  |  |  |  |
Exploration & Production | Foreign (outside Italy) | Other Significant Investments Five [Member] | Third parties |  |  |  |  |  |  |
Other significant investments |  |  |  |  |  |  |
% Ownership | 89.01% |  |  |  |  |  |
Exploration & Production | Foreign (outside Italy) | Other Significant Investments Five [Member] | Eni G&P LNG Aus. BV [Member] |  |  |  |  |  |  |
Other significant investments |  |  |  |  |  |  |
% Ownership | 10.99% |  |  |  |  |  |
Exploration & Production | Foreign (outside Italy) | Other Significant Investments Six [Member] |  |  |  |  |  |  |
Other significant investments |  |  |  |  |  |  |
Company name | New Liberty Residential Co Llc |  |  |  |  |  |
Registered office | West Trenton (USA) |  |  |  |  |  |
Country of operation | USA |  |  |  |  |  |
Share capital | $ |  |  |  |  | 0 |  |
Consolidation or valuation method | F.V. |  |  |  |  |  |
Exploration & Production | Foreign (outside Italy) | Other Significant Investments Six [Member] | Third parties |  |  |  |  |  |  |
Other significant investments |  |  |  |  |  |  |
% Ownership | 82.50% |  |  |  |  |  |
Exploration & Production | Foreign (outside Italy) | Other Significant Investments Six [Member] | Eni Oil & Gas Inc [Member] |  |  |  |  |  |  |
Other significant investments |  |  |  |  |  |  |
% Ownership | 17.50% |  |  |  |  |  |
Exploration & Production | Foreign (outside Italy) | Other Significant Investments Seven [Member] |  |  |  |  |  |  |
Other significant investments |  |  |  |  |  |  |
Company name | Nigeria LNG Ltd |  |  |  |  |  |
Registered office | Port Harcourt (Nigeria) |  |  |  |  |  |
Country of operation | Nigeria |  |  |  |  |  |
Share capital | $ |  |  |  |  | $ 1,138,207,000 |  |
Consolidation or valuation method | F.V. |  |  |  |  |  |
Exploration & Production | Foreign (outside Italy) | Other Significant Investments Seven [Member] | Third parties |  |  |  |  |  |  |
Other significant investments |  |  |  |  |  |  |
% Ownership | 89.60% |  |  |  |  |  |
Exploration & Production | Foreign (outside Italy) | Other Significant Investments Seven [Member] | Eni Int. NA NV Srl [Member] |  |  |  |  |  |  |
Other significant investments |  |  |  |  |  |  |
% Ownership | 10.40% |  |  |  |  |  |
Exploration & Production | Foreign (outside Italy) | Other Significant Investments Eight [Member] |  |  |  |  |  |  |
Other significant investments |  |  |  |  |  |  |
Company name | North Caspian Operating Company NV |  |  |  |  |  |
Registered office | The Hague (Netherlands) |  |  |  |  |  |
Country of operation | Kazakhstan |  |  |  |  |  |
Share capital | € |  |  |  |  |  | € 128,520 |
Consolidation or valuation method | F.V. |  |  |  |  |  |
Exploration & Production | Foreign (outside Italy) | Other Significant Investments Eight [Member] | Third parties |  |  |  |  |  |  |
Other significant investments |  |  |  |  |  |  |
% Ownership | 83.19% |  |  |  |  |  |
Exploration & Production | Foreign (outside Italy) | Other Significant Investments Eight [Member] | Agip Caspian Sea BV [Member] |  |  |  |  |  |  |
Other significant investments |  |  |  |  |  |  |
% Ownership | 16.81% |  |  |  |  |  |
Exploration & Production | Foreign (outside Italy) | Other Significant Investments Nine [Member] |  |  |  |  |  |  |
Other significant investments |  |  |  |  |  |  |
Company name | OPCO - Sociedade Operacional Angola LNG SA |  |  |  |  |  |
Registered office | Luanda (Angola) |  |  |  |  |  |
Country of operation | Angola |  |  |  |  |  |
Share capital | Kz |  | Kz 7,400,000 |  |  |  |  |
Consolidation or valuation method | F.V. |  |  |  |  |  |
Exploration & Production | Foreign (outside Italy) | Other Significant Investments Nine [Member] | Third parties |  |  |  |  |  |  |
Other significant investments |  |  |  |  |  |  |
% Ownership | 86.40% |  |  |  |  |  |
Exploration & Production | Foreign (outside Italy) | Other Significant Investments Nine [Member] | Eni Angola Prod.BV [Member] |  |  |  |  |  |  |
Other significant investments |  |  |  |  |  |  |
% Ownership | 13.60% |  |  |  |  |  |
Exploration & Production | Foreign (outside Italy) | Other Significant Investments Ten [Member] |  |  |  |  |  |  |
Other significant investments |  |  |  |  |  |  |
Company name | Petrolera Güiria SA |  |  |  |  |  |
Registered office | Caracas (Venezuela) |  |  |  |  |  |
Country of operation | Venezuela |  |  |  |  |  |
Share capital | |  |  |  | 10 |  |  |
Consolidation or valuation method | F.V. |  |  |  |  |  |
Exploration & Production | Foreign (outside Italy) | Other Significant Investments Ten [Member] | Eni Venezuela BV |  |  |  |  |  |  |
Other significant investments |  |  |  |  |  |  |
% Ownership | 19.50% |  |  |  |  |  |
Exploration & Production | Foreign (outside Italy) | Other Significant Investments Ten [Member] | Third parties |  |  |  |  |  |  |
Other significant investments |  |  |  |  |  |  |
% Ownership | 80.50% |  |  |  |  |  |
Exploration & Production | Foreign (outside Italy) | Other Significant Investments Eleven [Member] |  |  |  |  |  |  |
Other significant investments |  |  |  |  |  |  |
Company name | SOMG - Sociedade de Operações e Manutenção de Gasodutos SA |  |  |  |  |  |
Registered office | Luanda (Angola) |  |  |  |  |  |
Country of operation | Angola |  |  |  |  |  |
Share capital | Kz |  | Kz 7,400,000 |  |  |  |  |
Consolidation or valuation method | F.V. |  |  |  |  |  |
Exploration & Production | Foreign (outside Italy) | Other Significant Investments Eleven [Member] | Third parties |  |  |  |  |  |  |
Other significant investments |  |  |  |  |  |  |
% Ownership | 89.43% |  |  |  |  |  |
Exploration & Production | Foreign (outside Italy) | Other Significant Investments Eleven [Member] | Eni Angola Prod.BV [Member] |  |  |  |  |  |  |
Other significant investments |  |  |  |  |  |  |
% Ownership | 10.57% |  |  |  |  |  |
Exploration & Production | Foreign (outside Italy) | Other Significant Investments Twelve [Member] |  |  |  |  |  |  |
Other significant investments |  |  |  |  |  |  |
Company name | Torsina Oil Co |  |  |  |  |  |
Registered office | Cairo (Egypt) |  |  |  |  |  |
Country of operation | Egypt |  |  |  |  |  |
Share capital | ج.م. |  |  | ج.م. 20,000 |  |  |  |
Consolidation or valuation method | F.V. |  |  |  |  |  |
Exploration & Production | Foreign (outside Italy) | Other Significant Investments Twelve [Member] | Third parties |  |  |  |  |  |  |
Other significant investments |  |  |  |  |  |  |
% Ownership | 87.50% |  |  |  |  |  |
Exploration & Production | Foreign (outside Italy) | Other Significant Investments Twelve [Member] | Ieoc Production BV |  |  |  |  |  |  |
Other significant investments |  |  |  |  |  |  |
% Ownership | 12.50% |  |  |  |  |  |

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