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Other information about investments - Subsidiaries - Refining & Marketing and Chemical (Details) | 12 Months Ended |  |
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Dec. 31, 2019 RUB (₽) | Dec. 31, 2019 HUF (Ft) | Dec. 31, 2019 TRY (₺) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 MXN ($) | Dec. 31, 2019 INR (₨) | Dec. 31, 2019 CHF (SFr) | Dec. 31, 2019 SGD ($) | Dec. 31, 2019 GBP (£) | Dec. 31, 2019 XAF ( ) | 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
Refining & Marketing | Italy | Subsidiaries One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | Ecofuel SpA |  |  |  |  |  |  |  |  |  |  |  |
Registered office | San Donato Milanese (MI) |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | Italy |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  |  |  |  |  |  |  |  |  |  |  | 52,000,000 |
% Equity ratio | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Italy | Subsidiaries One [Member] | ENI SpA |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Italy | Subsidiaries Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | Eni Fuel SpA |  |  |  |  |  |  |  |  |  |  |  |
Registered office | Rome |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | Italy |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  |  |  |  |  |  |  |  |  |  |  | 58,944,310 |
% Equity ratio | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Italy | Subsidiaries Two [Member] | ENI SpA |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Italy | Subsidiaries Three [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | Petroven Srl |  |  |  |  |  |  |  |  |  |  |  |
Registered office | Genova |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | Italy |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  |  |  |  |  |  |  |  |  |  |  | 918,520 |
% Equity ratio | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Italy | Subsidiaries Three [Member] | Ecofuel SpA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Italy | Subsidiaries Four [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | Raffineria di Gela SpA |  |  |  |  |  |  |  |  |  |  |  |
Registered office | Gela (CL) |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | Italy |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  |  |  |  |  |  |  |  |  |  |  | 15,000,000 |
% Equity ratio | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Italy | Subsidiaries Four [Member] | ENI SpA |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Italy | Subsidiaries Five [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | SeaPad SpA |  |  |  |  |  |  |  |  |  |  |  |
Registered office | Genova |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | Italy |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  |  |  |  |  |  |  |  |  |  |  | 12,400,000 |
Consolidation or valuation method | Eq. |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Italy | Subsidiaries Five [Member] | Third parties |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 20.00% |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Italy | Subsidiaries Five [Member] | Ecofuel SpA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 80.00% |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Italy | Subsidiaries Six [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | Servizi Fondo Bombole Metano SpA |  |  |  |  |  |  |  |  |  |  |  |
Registered office | Rome |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | Italy |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  |  |  |  |  |  |  |  |  |  |  | 13,580,000.20 |
Consolidation or valuation method | Co. |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Italy | Subsidiaries Six [Member] | ENI SpA |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Seven [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | Eni Abu Dhabi Refining & Trading BV |  |  |  |  |  |  |  |  |  |  |  |
Registered office | Amsterdam (Netherlands) |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | Netherlands |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  |  |  |  |  |  |  |  |  |  |  | 20,000 |
% Equity ratio | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Seven [Member] | Eni International BV |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Eight [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | Eni Abu Dhabi Refining & Trading Services BV |  |  |  |  |  |  |  |  |  |  |  |
Registered office | Amsterdam (Netherlands) |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | Netherlands |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  |  |  |  |  |  |  |  |  |  |  | 20,000 |
Consolidation or valuation method | Eq. |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Eight [Member] | Eni Abu Dhabi R&T BV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Nine [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | Eni Austria GmbH |  |  |  |  |  |  |  |  |  |  |  |
Registered office | Wien (Austria) |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | Austria |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  |  |  |  |  |  |  |  |  |  |  | 78,500,000 |
% Equity ratio | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Nine [Member] | Eni International BV |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 75.00% |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Nine [Member] | Eni Deutsch.GmbH [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 25.00% |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Ten [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | Eni Benelux BV |  |  |  |  |  |  |  |  |  |  |  |
Registered office | Rotterdam (Netherlands) |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | Netherlands |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  |  |  |  |  |  |  |  |  |  |  | 1,934,040 |
% Equity ratio | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Ten [Member] | Eni International BV |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Eleven [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | Eni Deutschland GmbH |  |  |  |  |  |  |  |  |  |  |  |
Registered office | Munich (Germany) |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | Germany |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  |  |  |  |  |  |  |  |  |  |  | 90,000,000 |
% Equity ratio | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Eleven [Member] | Eni International BV |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 89.00% |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Eleven [Member] | Eni Oil Holdings BV |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 11.00% |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Twelve [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | Eni Ecuador SA |  |  |  |  |  |  |  |  |  |  |  |
Registered office | Quito (Ecuador) |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | Ecuador |  |  |  |  |  |  |  |  |  |  |  |
Share capital | $ |  |  |  |  |  |  |  |  |  |  | $ 103,142.08 |  |
% Equity ratio | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Twelve [Member] | Eni International BV |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 99.93% |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Twelve [Member] | Esain SA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 0.07% |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Thirteen [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | Eni France Sàrl |  |  |  |  |  |  |  |  |  |  |  |
Registered office | Lyon (France) |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | France |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  |  |  |  |  |  |  |  |  |  |  | 56,800,000 |
% Equity ratio | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Thirteen [Member] | Eni International BV |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Fourteen [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | Eni Iberia SLU |  |  |  |  |  |  |  |  |  |  |  |
Registered office | Alcobendas (Spain) |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | Spain |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  |  |  |  |  |  |  |  |  |  |  | 17,299,100 |
% Equity ratio | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Fourteen [Member] | Eni International BV |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Fifteen [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | Eni Lubricants Trading (Shanghai) Co Ltd |  |  |  |  |  |  |  |  |  |  |  |
Registered office | Shanghai (China) |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | China |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |
% Equity ratio | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Fifteen [Member] | Eni International BV |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Sixteen [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | Eni Marketing Austria GmbH |  |  |  |  |  |  |  |  |  |  |  |
Registered office | Wien (Austria) |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | Austria |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  |  |  |  |  |  |  |  |  |  |  | 19,621,665.23 |
% Equity ratio | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Sixteen [Member] | Eni Minerallh.GmbH [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 99.99% |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Seventeen [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | Eni Mineralölhandel GmbH |  |  |  |  |  |  |  |  |  |  |  |
Registered office | Wien (Austria) |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | Austria |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  |  |  |  |  |  |  |  |  |  |  | 34,156,232.06 |
% Equity ratio | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Seventeen [Member] | Eni Austria GmbH [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Eighteen [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | Eni Schmiertechnik GmbH |  |  |  |  |  |  |  |  |  |  |  |
Registered office | Wurzburg (Germany) |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | Germany |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |
% Equity ratio | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Eighteen [Member] | Eni Deutsch.GmbH [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Nineteen [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | Eni Suisse SA |  |  |  |  |  |  |  |  |  |  |  |
Registered office | Lausanne (Switzerland) |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | Switzerland |  |  |  |  |  |  |  |  |  |  |  |
Share capital | SFr |  |  |  |  |  |  | SFr 102,500,000 |  |  |  |  |  |
% Equity ratio | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Nineteen [Member] | Eni International BV |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Twenty [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | Eni USA R&M Co Inc |  |  |  |  |  |  |  |  |  |  |  |
Registered office | Wilmington (USA) |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | USA |  |  |  |  |  |  |  |  |  |  |  |
Share capital | $ |  |  |  |  |  |  |  |  |  |  | 11,000,000 |  |
Consolidation or valuation method | Eq. |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Twenty [Member] | Eni International BV |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Twenty One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | Esacontrol SA |  |  |  |  |  |  |  |  |  |  |  |
Registered office | Quito (Ecuador) |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | Ecuador |  |  |  |  |  |  |  |  |  |  |  |
Share capital | $ |  |  |  |  |  |  |  |  |  |  | 60,000 |  |
Consolidation or valuation method | Eq. |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Twenty One [Member] | Third parties |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 13.00% |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Twenty One [Member] | Eni Ecuador SA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 87.00% |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Twenty Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | Esain SA |  |  |  |  |  |  |  |  |  |  |  |
Registered office | Quito (Ecuador) |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | Ecuador |  |  |  |  |  |  |  |  |  |  |  |
Share capital | $ |  |  |  |  |  |  |  |  |  |  | 30,000 |  |
% Equity ratio | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Twenty Two [Member] | Eni Ecuador SA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 99.99% |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Twenty Three [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | Oléoduc du Rhône SA |  |  |  |  |  |  |  |  |  |  |  |
Registered office | Valais (Switzerland) |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | Switzerland |  |  |  |  |  |  |  |  |  |  |  |
Share capital | SFr |  |  |  |  |  |  | SFr 7,000,000 |  |  |  |  |  |
Consolidation or valuation method | Eq. |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Twenty Three [Member] | Eni International BV |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Twenty Four [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | OOO "Eni-Nefto" |  |  |  |  |  |  |  |  |  |  |  |
Registered office | Moscow (Russia) |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | Russia |  |  |  |  |  |  |  |  |  |  |  |
Share capital | ₽ | ₽ 1,010,000 |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valuation method | Eq. |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Twenty Four [Member] | Eni International BV |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 99.01% |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Twenty Four [Member] | Eni Oil Holdings BV |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 0.99% |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Twenty Five [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | Tecnoesa SA |  |  |  |  |  |  |  |  |  |  |  |
Registered office | Quito (Ecuador) |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | Ecuador |  |  |  |  |  |  |  |  |  |  |  |
Share capital | $ |  |  |  |  |  |  |  |  |  |  | 36,000 |  |
Consolidation or valuation method | Eq. |  |  |  |  |  |  |  |  |  |  |  |
Refining & Marketing | Foreign (outside Italy) | Subsidiaries Twenty Five [Member] | Eni Ecuador SA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 99.99% |  |  |  |  |  |  |  |  |  |  |  |
Chemicals | Italy | SubsidiariesTwenty Six [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | Versalis SpA |  |  |  |  |  |  |  |  |  |  |  |
Registered office | San Donato Milanese (MI) |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | Italy |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  |  |  |  |  |  |  |  |  |  |  | 1,364,790,000 |
% Equity ratio | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |  |  |  |  |  |  |
Chemicals | Italy | SubsidiariesTwenty Six [Member] | ENI SpA |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Chemicals | Foreign (outside Italy) | SubsidiariesTwenty Seven [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | Dunastyr Polisztirolgyártó Zártkörûen Mûködõ Részvénytársaság |  |  |  |  |  |  |  |  |  |  |  |
Registered office | Budapest (Hungary) |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | Hungary |  |  |  |  |  |  |  |  |  |  |  |
Share capital | Ft |  | Ft 8,092,160,000 |  |  |  |  |  |  |  |  |  |  |
% Equity ratio | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |  |  |  |  |  |  |
Chemicals | Foreign (outside Italy) | SubsidiariesTwenty Seven [Member] | Versalis SpA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 96.34% |  |  |  |  |  |  |  |  |  |  |  |
Chemicals | Foreign (outside Italy) | SubsidiariesTwenty Seven [Member] | Versalis Deutsc GmbH [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 1.83% |  |  |  |  |  |  |  |  |  |  |  |
Chemicals | Foreign (outside Italy) | SubsidiariesTwenty Seven [Member] | Versalis Int. SA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 1.83% |  |  |  |  |  |  |  |  |  |  |  |
Chemicals | Foreign (outside Italy) | SubsidiariesTwenty Eight [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | Versalis Americas Inc |  |  |  |  |  |  |  |  |  |  |  |
Registered office | Dover, Delaware (USA) |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | USA |  |  |  |  |  |  |  |  |  |  |  |
Share capital | $ |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |
% Equity ratio | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |  |  |  |  |  |  |
Chemicals | Foreign (outside Italy) | SubsidiariesTwenty Eight [Member] | Versalis International SA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Chemicals | Foreign (outside Italy) | SubsidiariesTwenty Nine [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | Versalis Congo Sarlu |  |  |  |  |  |  |  |  |  |  |  |
Registered office | Pointe-Noire (Republic of the Congo) |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | Republic of the Congo |  |  |  |  |  |  |  |  |  |  |  |
Share capital | |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |
% Equity ratio | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |  |  |  |  |  |  |
Chemicals | Foreign (outside Italy) | SubsidiariesTwenty Nine [Member] | Versalis International SA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Chemicals | Foreign (outside Italy) | Subsidiaries Thirty [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | Versalis Deutschland GmbH |  |  |  |  |  |  |  |  |  |  |  |
Registered office | Eschborn (Germany) |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | Germany |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  |  |  |  |  |  |  |  |  |  |  | 100,000 |
% Equity ratio | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |  |  |  |  |  |  |
Chemicals | Foreign (outside Italy) | Subsidiaries Thirty [Member] | Versalis SpA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Chemicals | Foreign (outside Italy) | Subsidiaries Thirty One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | Versalis France SAS |  |  |  |  |  |  |  |  |  |  |  |
Registered office | Mardyck (France) |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | France |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  |  |  |  |  |  |  |  |  |  |  | 126,115,582.90 |
% Equity ratio | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |  |  |  |  |  |  |
Chemicals | Foreign (outside Italy) | Subsidiaries Thirty One [Member] | Versalis SpA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Chemicals | Foreign (outside Italy) | Subsidiaries Thirty Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | Versalis International SA |  |  |  |  |  |  |  |  |  |  |  |
Registered office | Bruxelles (Belgium) |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | Belgium |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  |  |  |  |  |  |  |  |  |  |  | € 15,449,173.88 |
% Equity ratio | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |  |  |  |  |  |  |
Chemicals | Foreign (outside Italy) | Subsidiaries Thirty Two [Member] | Versalis SpA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 59.00% |  |  |  |  |  |  |  |  |  |  |  |
Chemicals | Foreign (outside Italy) | Subsidiaries Thirty Two [Member] | Versalis Deutsc GmbH [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 23.71% |  |  |  |  |  |  |  |  |  |  |  |
Chemicals | Foreign (outside Italy) | Subsidiaries Thirty Two [Member] | Dunastyr Zrt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 14.43% |  |  |  |  |  |  |  |  |  |  |  |
Chemicals | Foreign (outside Italy) | Subsidiaries Thirty Two [Member] | Versalis France [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 2.86% |  |  |  |  |  |  |  |  |  |  |  |
Chemicals | Foreign (outside Italy) | Subsidiaries Thirty Three [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | Versalis Kimya Ticaret Limited Sirketi |  |  |  |  |  |  |  |  |  |  |  |
Registered office | Istanbul (Turkey) |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | Turkey |  |  |  |  |  |  |  |  |  |  |  |
Share capital | ₺ |  |  | ₺ 20,000 |  |  |  |  |  |  |  |  |  |
Consolidation or valuation method | Eq. |  |  |  |  |  |  |  |  |  |  |  |
Chemicals | Foreign (outside Italy) | Subsidiaries Thirty Three [Member] | Versalis Int. SA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Chemicals | Foreign (outside Italy) | Subsidiaries Thirty Four [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | Versalis México S. de R.L. de CV |  |  |  |  |  |  |  |  |  |  |  |
Registered office | Mexico City (México) |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | Mexico |  |  |  |  |  |  |  |  |  |  |  |
Share capital | $ |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |
Consolidation or valuation method | Eq. |  |  |  |  |  |  |  |  |  |  |  |
Chemicals | Foreign (outside Italy) | Subsidiaries Thirty Four [Member] | Versalis SpA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 1.00% |  |  |  |  |  |  |  |  |  |  |  |
Chemicals | Foreign (outside Italy) | Subsidiaries Thirty Four [Member] | Versalis Int. SA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 99.00% |  |  |  |  |  |  |  |  |  |  |  |
Chemicals | Foreign (outside Italy) | Subsidiaries Thirty Five [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | Versalis Pacific (India) Private Ltd |  |  |  |  |  |  |  |  |  |  |  |
Registered office | Mumbai (India) |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | India |  |  |  |  |  |  |  |  |  |  |  |
Share capital | ₨ |  |  |  |  |  | ₨ 238,700 |  |  |  |  |  |  |
Consolidation or valuation method | Eq. |  |  |  |  |  |  |  |  |  |  |  |
Chemicals | Foreign (outside Italy) | Subsidiaries Thirty Five [Member] | Versalis Sing P Ltd [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 99.99% |  |  |  |  |  |  |  |  |  |  |  |
Chemicals | Foreign (outside Italy) | Subsidiaries Thirty Six [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | Versalis Pacific Trading (Shanghai) Co Ltd |  |  |  |  |  |  |  |  |  |  |  |
Registered office | Shanghai (China) |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | China |  |  |  |  |  |  |  |  |  |  |  |
Share capital | ¥ |  |  |  | ¥ 1,000,000 |  |  |  |  |  |  |  |  |
% Equity ratio | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |  |  |  |  |  |  |
Chemicals | Foreign (outside Italy) | Subsidiaries Thirty Six [Member] | Versalis SpA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Chemicals | Foreign (outside Italy) | Subsidiaries Thirty Seven [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | Versalis Singapore Pte Ltd |  |  |  |  |  |  |  |  |  |  |  |
Registered office | Singapore (Singapore) |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | Singapore |  |  |  |  |  |  |  |  |  |  |  |
Share capital | $ |  |  |  |  |  |  |  | $ 80,000 |  |  |  |  |
% Equity ratio | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |  |  |  |  |  |  |
Chemicals | Foreign (outside Italy) | Subsidiaries Thirty Seven [Member] | Versalis SpA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Chemicals | Foreign (outside Italy) | Subsidiaries Thirty Eight [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
Company name | Versalis UK Ltd |  |  |  |  |  |  |  |  |  |  |  |
Registered office | London (United Kingdom) |  |  |  |  |  |  |  |  |  |  |  |
Country of operation | United Kingdom |  |  |  |  |  |  |  |  |  |  |  |
Share capital | £ |  |  |  |  |  |  |  |  | £ 4,004,042 |  |  |  |
% Equity ratio | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |  |  |  |  |  |  |  |
Chemicals | Foreign (outside Italy) | Subsidiaries Thirty Eight [Member] | Versalis SpA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |  |  |  |  |  |  |  |

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