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Other information about investments - Subsidiaries - Gas & Power (Details) | 12 Months Ended |  |
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Dec. 31, 2019 MXN ($) | Dec. 31, 2019 TND (د.ت) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 EUR (€) | Dec. 31, 2018 EUR (€)
Subsidiaries |  |  |  |  |
Share capital |  |  |  | € 4,005,000,000 | € 4,005,000,000
ENI SpA |  |  |  |  |
Subsidiaries |  |  |  |  |
Share capital |  |  |  | 4,005,358,876 | € 4,005,358,876
Gas & Power | Italy | Subsidiaries One [Member] |  |  |  |  |
Subsidiaries |  |  |  |  |
Company name | Eni gas e luce SpA |  |  |  |
Registered office | San Donato Milanese (MI) |  |  |  |
Country of operation | Italy |  |  |  |
Share capital |  |  |  | 750,000,000 |
% Equity ratio | 100.00% |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |
Gas & Power | Italy | Subsidiaries One [Member] | ENI SpA |  |  |  |  |
Subsidiaries |  |  |  |  |
% Ownership | 100.00% |  |  |  |
Gas & Power | Italy | Subsidiaries Two [Member] |  |  |  |  |
Subsidiaries |  |  |  |  |
Company name | Eni Gas Transport Services Srl |  |  |  |
Registered office | San Donato Milanese (MI) |  |  |  |
Country of operation | Italy |  |  |  |
Share capital |  |  |  | 120,000 |
Consolidation or valuation method | Co. |  |  |  |
Gas & Power | Italy | Subsidiaries Two [Member] | ENI SpA |  |  |  |  |
Subsidiaries |  |  |  |  |
% Ownership | 100.00% |  |  |  |
Gas & Power | Italy | Subsidiaries Three [Member] |  |  |  |  |
Subsidiaries |  |  |  |  |
Company name | Eni Trading & Shipping SpA |  |  |  |
Registered office | Rome |  |  |  |
Country of operation | Italy |  |  |  |
Share capital |  |  |  | 60,036,650 |
% Equity ratio | 100.00% |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |
Gas & Power | Italy | Subsidiaries Three [Member] | ENI SpA |  |  |  |  |
Subsidiaries |  |  |  |  |
% Ownership | 100.00% |  |  |  |
Gas & Power | Italy | Subsidiaries Four [Member] |  |  |  |  |
Subsidiaries |  |  |  |  |
Company name | EniPower Mantova SpA |  |  |  |
Registered office | San Donato Milanese (MI) |  |  |  |
Country of operation | Italy |  |  |  |
Share capital |  |  |  | 144,000,000 |
% Equity ratio | 86.50% |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |
Gas & Power | Italy | Subsidiaries Four [Member] | Third parties |  |  |  |  |
Subsidiaries |  |  |  |  |
% Ownership | 13.50% |  |  |  |
Gas & Power | Italy | Subsidiaries Four [Member] | EniPower SpA [Member] |  |  |  |  |
Subsidiaries |  |  |  |  |
% Ownership | 86.50% |  |  |  |
Gas & Power | Italy | Subsidiaries Five [Member] |  |  |  |  |
Subsidiaries |  |  |  |  |
Company name | EniPower SpA |  |  |  |
Registered office | San Donato Milanese (MI) |  |  |  |
Country of operation | Italy |  |  |  |
Share capital |  |  |  | 944,947,849 |
% Equity ratio | 100.00% |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |
Gas & Power | Italy | Subsidiaries Five [Member] | ENI SpA |  |  |  |  |
Subsidiaries |  |  |  |  |
% Ownership | 100.00% |  |  |  |
Gas & Power | Italy | Subsidiaries Six [Member] |  |  |  |  |
Subsidiaries |  |  |  |  |
Company name | LNG Shipping SpA |  |  |  |
Registered office | San Donato Milanese (MI) |  |  |  |
Country of operation | Italy |  |  |  |
Share capital |  |  |  | 240,900,000 |
% Equity ratio | 100.00% |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |
Gas & Power | Italy | Subsidiaries Six [Member] | ENI SpA |  |  |  |  |
Subsidiaries |  |  |  |  |
% Ownership | 100.00% |  |  |  |
Gas & Power | Italy | Subsidiaries Seven [Member] |  |  |  |  |
Subsidiaries |  |  |  |  |
Company name | SEA SpA |  |  |  |
Registered office | L'Aquila (AQ) |  |  |  |
Country of operation | Italy |  |  |  |
Share capital |  |  |  | 100,000 |
% Equity ratio | 60.00% |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |
Gas & Power | Italy | Subsidiaries Seven [Member] | Third parties |  |  |  |  |
Subsidiaries |  |  |  |  |
% Ownership | 40.00% |  |  |  |
Gas & Power | Italy | Subsidiaries Seven [Member] | Eni gas e luce SPA [Member] |  |  |  |  |
Subsidiaries |  |  |  |  |
% Ownership | 60.00% |  |  |  |
Gas & Power | Italy | Subsidiaries Eight [Member] |  |  |  |  |
Subsidiaries |  |  |  |  |
Company name | Trans Tunisian Pipeline Co SpA |  |  |  |
Registered office | San Donato Milanese (MI) |  |  |  |
Country of operation | Tunisia |  |  |  |
Share capital |  |  |  | 1,098,000 |
% Equity ratio | 100.00% |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |
Gas & Power | Italy | Subsidiaries Eight [Member] | ENI SpA |  |  |  |  |
Subsidiaries |  |  |  |  |
% Ownership | 100.00% |  |  |  |
Gas & Power | Foreign (outside Italy) | Subsidiaries Nine [Member] |  |  |  |  |
Subsidiaries |  |  |  |  |
Company name | Adriaplin Podjetje za distribucijo zemeljskega plina doo Ljubljana |  |  |  |
Registered office | Ljubljana (Slovenia) |  |  |  |
Country of operation | Slovenia |  |  |  |
Share capital |  |  |  | 12,956,935 |
% Equity ratio | 51.00% |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |
Gas & Power | Foreign (outside Italy) | Subsidiaries Nine [Member] | Third parties |  |  |  |  |
Subsidiaries |  |  |  |  |
% Ownership | 49.00% |  |  |  |
Gas & Power | Foreign (outside Italy) | Subsidiaries Nine [Member] | Eni gas e luce SPA [Member] |  |  |  |  |
Subsidiaries |  |  |  |  |
% Ownership | 51.00% |  |  |  |
Gas & Power | Foreign (outside Italy) | Subsidiaries Ten [Member] |  |  |  |  |
Subsidiaries |  |  |  |  |
Company name | Eni G&P Trading BV |  |  |  |
Registered office | Amsterdam (Netherlands) |  |  |  |
Country of operation | Turkey |  |  |  |
Share capital |  |  |  | 70,000 |
% Equity ratio | 100.00% |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |
Gas & Power | Foreign (outside Italy) | Subsidiaries Ten [Member] | Eni International BV |  |  |  |  |
Subsidiaries |  |  |  |  |
% Ownership | 100.00% |  |  |  |
Gas & Power | Foreign (outside Italy) | Subsidiaries Eleven [Member] |  |  |  |  |
Subsidiaries |  |  |  |  |
Company name | Eni Gas & Power France SA |  |  |  |
Registered office | Levallois Perret (France) |  |  |  |
Country of operation | France |  |  |  |
Share capital |  |  |  | 29,937,600 |
% Equity ratio | 99.87% |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |
Gas & Power | Foreign (outside Italy) | Subsidiaries Eleven [Member] | Third parties |  |  |  |  |
Subsidiaries |  |  |  |  |
% Ownership | 0.13% |  |  |  |
Gas & Power | Foreign (outside Italy) | Subsidiaries Eleven [Member] | Eni gas e luce SPA [Member] |  |  |  |  |
Subsidiaries |  |  |  |  |
% Ownership | 99.87% |  |  |  |
Gas & Power | Foreign (outside Italy) | Subsidiaries Twelve [Member] |  |  |  |  |
Subsidiaries |  |  |  |  |
Company name | Eni Trading & Shipping Inc |  |  |  |
Registered office | Dover, Delaware (USA) |  |  |  |
Country of operation | USA |  |  |  |
Share capital | $ |  |  | $ 36,000,000 |  |
% Equity ratio | 100.00% |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |
Gas & Power | Foreign (outside Italy) | Subsidiaries Twelve [Member] | ETS SpA [Member] |  |  |  |  |
Subsidiaries |  |  |  |  |
% Ownership | 100.00% |  |  |  |
Gas & Power | Foreign (outside Italy) | Subsidiaries Thirteen [Member] |  |  |  |  |
Subsidiaries |  |  |  |  |
Company name | Eni Transporte y Suministro México, S. de RL de CV |  |  |  |
Registered office | Mexico City (Mexico) |  |  |  |
Country of operation | Mexico |  |  |  |
Share capital | $ | $ 3,000 |  |  |  |
Consolidation or valuation method | Eq. |  |  |  |
Gas & Power | Foreign (outside Italy) | Subsidiaries Thirteen [Member] | Eni International BV |  |  |  |  |
Subsidiaries |  |  |  |  |
% Ownership | 99.90% |  |  |  |
Gas & Power | Foreign (outside Italy) | Subsidiaries Thirteen [Member] | Eni Oil Holdings BV |  |  |  |  |
Subsidiaries |  |  |  |  |
% Ownership | 0.10% |  |  |  |
Gas & Power | Foreign (outside Italy) | Subsidiaries Fourteen [Member] |  |  |  |  |
Subsidiaries |  |  |  |  |
Company name | Gas Supply Company Thessaloniki - Thessalia SA |  |  |  |
Registered office | Thessaloniki (Greece) |  |  |  |
Country of operation | Greece |  |  |  |
Share capital |  |  |  | € 13,761,788 |
% Equity ratio | 100.00% |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |
Gas & Power | Foreign (outside Italy) | Subsidiaries Fourteen [Member] | Eni gas e luce SPA [Member] |  |  |  |  |
Subsidiaries |  |  |  |  |
% Ownership | 100.00% |  |  |  |
Gas & Power | Foreign (outside Italy) | Subsidiaries Fifteen [Member] |  |  |  |  |
Subsidiaries |  |  |  |  |
Company name | Société de Service du Gazoduc Transtunisien SA - Sergaz SA |  |  |  |
Registered office | Tunisi (Tunisia) |  |  |  |
Country of operation | Tunisia |  |  |  |
Share capital | د.ت |  | د.ت 99,000 |  |  |
% Equity ratio | 66.67% |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |
Gas & Power | Foreign (outside Italy) | Subsidiaries Fifteen [Member] | Third parties |  |  |  |  |
Subsidiaries |  |  |  |  |
% Ownership | 33.33% |  |  |  |
Gas & Power | Foreign (outside Italy) | Subsidiaries Fifteen [Member] | Eni International BV |  |  |  |  |
Subsidiaries |  |  |  |  |
% Ownership | 66.67% |  |  |  |
Gas & Power | Foreign (outside Italy) | Subsidiaries Sixteen [Member] |  |  |  |  |
Subsidiaries |  |  |  |  |
Company name | Société pour la Construction du Gazoduc Transtunisien SA - Scogat SA |  |  |  |
Registered office | Tunisi (Tunisia) |  |  |  |
Country of operation | Tunisia |  |  |  |
Share capital | د.ت |  | د.ت 200,000 |  |  |
% Equity ratio | 100.00% |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |
Gas & Power | Foreign (outside Italy) | Subsidiaries Sixteen [Member] | ENI SpA |  |  |  |  |
Subsidiaries |  |  |  |  |
% Ownership | 0.05% |  |  |  |
Gas & Power | Foreign (outside Italy) | Subsidiaries Sixteen [Member] | Eni International BV |  |  |  |  |
Subsidiaries |  |  |  |  |
% Ownership | 99.85% |  |  |  |
Gas & Power | Foreign (outside Italy) | Subsidiaries Sixteen [Member] | LNG Shipping SpA [Member] |  |  |  |  |
Subsidiaries |  |  |  |  |
% Ownership | 0.05% |  |  |  |
Gas & Power | Foreign (outside Italy) | Subsidiaries Sixteen [Member] | Trans Tunis P Co SpA [Member] |  |  |  |  |
Subsidiaries |  |  |  |  |
% Ownership | 0.05% |  |  |  |

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