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Other information about investments - Subsidiaries - Corporate and other activities (Details) | 12 Months Ended |  |
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Dec. 31, 2021 USD ($) | Dec. 31, 2021 EUR (€) | Dec. 31, 2021 GBP (£) | Dec. 31, 2021 EGP (ج.م.) | Dec. 31, 2021 CHF (SFr) | Dec. 31, 2020 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
Corporate and financial companies | Italy | Subsidiaries One [Member] |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
Company name | Agenzia Giornalistica Italia SpA |  |  |  |  |
Registered office | Rome |  |  |  |  |
Country of operation | Italy |  |  |  |  |
Share capital |  | 2,000,000 |  |  |  |
% Equity ratio | 100.00% |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |
Corporate and financial companies | Italy | Subsidiaries One [Member] | ENI SpA |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |
Corporate and financial companies | Italy | Subsidiaries Two [Member] |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
Company name | D-Service Media Srl (in liquidation) |  |  |  |  |
Registered office | Milan |  |  |  |  |
Country of operation | Italy |  |  |  |  |
Share capital |  | 75,000 |  |  |  |
Consolidation or valuation method | Eq. |  |  |  |  |
Corporate and financial companies | Italy | Subsidiaries Two [Member] | D-Share SpA |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |
Corporate and financial companies | Italy | Subsidiaries Three [Member] |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
Company name | D-Share SpA |  |  |  |  |
Registered office | Milan |  |  |  |  |
Country of operation | Italy |  |  |  |  |
Share capital |  | 121,719.25 |  |  |  |
% Equity ratio | 100.00% |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |
Corporate and financial companies | Italy | Subsidiaries Three [Member] | AGI SpA |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |
Corporate and financial companies | Italy | Subsidiaries Four [Member] |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
Company name | Eni Corporate University SpA |  |  |  |  |
Registered office | San Donato Milanese (MI) |  |  |  |  |
Country of operation | Italy |  |  |  |  |
Share capital |  | 3,360,000 |  |  |  |
% Equity ratio | 100.00% |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |
Corporate and financial companies | Italy | Subsidiaries Four [Member] | ENI SpA |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |
Corporate and financial companies | Italy | Subsidiaries Five [Member] |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
Company name | Eni Energia Italia Srl |  |  |  |  |
Registered office | San Donato Milanese (MI) |  |  |  |  |
Country of operation | Italy |  |  |  |  |
Share capital |  | 50,000 |  |  |  |
Consolidation or valuation method | Co. |  |  |  |  |
Corporate and financial companies | Italy | Subsidiaries Five [Member] | ENI SpA |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |
Corporate and financial companies | Italy | Subsidiaries Six [Member] |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
Company name | Eni Nuova Energia Srl |  |  |  |  |
Registered office | San Donato Milanese (MI) |  |  |  |  |
Country of operation | Italy |  |  |  |  |
Share capital |  | 50,000 |  |  |  |
Consolidation or valuation method | Co. |  |  |  |  |
Corporate and financial companies | Italy | Subsidiaries Six [Member] | ENI SpA |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |
Corporate and financial companies | Italy | Subsidiaries Seven [Member] |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
Company name | Eni Trading & Shipping SpA (in liquidation) |  |  |  |  |
Registered office | Rome |  |  |  |  |
Country of operation | Italy |  |  |  |  |
Share capital |  | 334,171 |  |  |  |
Consolidation or valuation method | Co. |  |  |  |  |
Corporate and financial companies | Italy | Subsidiaries Seven [Member] | ENI SpA |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |
Corporate and financial companies | Italy | Subsidiaries Eight [Member] |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
Company name | EniProgetti SpA |  |  |  |  |
Registered office | Venezia Marghera (VE) |  |  |  |  |
Country of operation | Italy |  |  |  |  |
Share capital |  | 2,064,000 |  |  |  |
% Equity ratio | 100.00% |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |
Corporate and financial companies | Italy | Subsidiaries Eight [Member] | ENI SpA |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |
Corporate and financial companies | Italy | Subsidiaries Nine [Member] |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
Company name | EniServizi SpA |  |  |  |  |
Registered office | San Donato Milanese (MI) |  |  |  |  |
Country of operation | Italy |  |  |  |  |
Share capital |  | 13,427,419.08 |  |  |  |
% Equity ratio | 100.00% |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |
Corporate and financial companies | Italy | Subsidiaries Nine [Member] | ENI SpA |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |
Corporate and financial companies | Italy | Subsidiaries Ten [Member] |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
Company name | Serfactoring SpA |  |  |  |  |
Registered office | San Donato Milanese (MI) |  |  |  |  |
Country of operation | Italy |  |  |  |  |
Share capital |  | 5,160,000 |  |  |  |
% Equity ratio | 100.00% |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |
Corporate and financial companies | Italy | Subsidiaries Ten [Member] | ENI SpA |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |
Corporate and financial companies | Italy | Subsidiaries Eleven [Member] |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
Company name | Servizi Aerei SpA |  |  |  |  |
Registered office | San Donato Milanese (MI) |  |  |  |  |
Country of operation | Italy |  |  |  |  |
Share capital |  | 48,205,536 |  |  |  |
% Equity ratio | 100.00% |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |
Corporate and financial companies | Italy | Subsidiaries Eleven [Member] | ENI SpA |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Twelve [Member] |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
Company name | Banque Eni SA |  |  |  |  |
Registered office | Bruxelles (Belgium) |  |  |  |  |
Country of operation | Belgium |  |  |  |  |
Share capital |  | 50,000,000 |  |  |  |
% Equity ratio | 100.00% |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Twelve [Member] | Eni International BV |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
% Ownership | 99.90% |  |  |  |  |
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Twelve [Member] | Eni Oil Holdings BV |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
% Ownership | 0.10% |  |  |  |  |
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Thirteen [Member] |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
Company name | D-Share USA Corp. |  |  |  |  |
Registered office | New York (USA) |  |  |  |  |
Country of operation | USA |  |  |  |  |
Share capital | $ | $ 0 |  |  |  |  |
Consolidation or valuation method | Co. |  |  |  |  |
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Thirteen [Member] | D-Share SpA |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Fourteen [Member] |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
Company name | Eni Finance International SA |  |  |  |  |
Registered office | Bruxelles (Belgium) |  |  |  |  |
Country of operation | Belgium |  |  |  |  |
Share capital | $ | $ 1,480,365,336 |  |  |  |  |
% Equity ratio | 100.00% |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Fourteen [Member] | ENI SpA |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
% Ownership | 33.61% |  |  |  |  |
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Fourteen [Member] | Eni International BV |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
% Ownership | 66.39% |  |  |  |  |
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Fifteen [Member] |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
Company name | Eni Finance USA Inc |  |  |  |  |
Registered office | Dover (USA) |  |  |  |  |
Country of operation | USA |  |  |  |  |
Share capital | $ | $ 15,000,000 |  |  |  |  |
% Equity ratio | 100.00% |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Fifteen [Member] | Eni Petroleum Co Inc |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Sixteen [Member] |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
Company name | Eni Insurance DAC |  |  |  |  |
Registered office | Dublin (Ireland) |  |  |  |  |
Country of operation | Ireland |  |  |  |  |
Share capital |  | 500,000,000 |  |  |  |
% Equity ratio | 100.00% |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Sixteen [Member] | ENI SpA |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Seventeen [Member] |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
Company name | Eni International BV |  |  |  |  |
Registered office | Amsterdam (Netherlands) |  |  |  |  |
Country of operation | Netherlands |  |  |  |  |
Share capital |  | 641,683,425 |  |  |  |
% Equity ratio | 100.00% |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Seventeen [Member] | ENI SpA |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Eighteen [Member] |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
Company name | Eni International Resources Ltd |  |  |  |  |
Registered office | London (United Kingdom) |  |  |  |  |
Country of operation | United Kingdom |  |  |  |  |
Share capital | £ |  |  | £ 50,000 |  |  |
% Equity ratio | 100.00% |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Eighteen [Member] | ENI SpA |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
% Ownership | 99.99% |  |  |  |  |
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Nineteen [Member] |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
Company name | Eni Next Llc |  |  |  |  |
Registered office | Dover (USA) |  |  |  |  |
Country of operation | USA |  |  |  |  |
Share capital | $ | $ 100 |  |  |  |  |
% Equity ratio | 100.00% |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Nineteen [Member] | Eni Petroleum Co Inc |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Twenty [Member] |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
Company name | EniProgetti Egypt Ltd |  |  |  |  |
Registered office | Cairo (Egypt) |  |  |  |  |
Country of operation | Egypt |  |  |  |  |
Share capital | ج.م. |  |  |  | ج.م. 50,000 |  |
Consolidation or valuation method | Eq. |  |  |  |  |
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Twenty [Member] | ENI SpA |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
% Ownership | 1.00% |  |  |  |  |
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Twenty [Member] | EniProgetti SpA |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
% Ownership | 99.00% |  |  |  |  |
Other activities | Italy | Subsidiaries One [Member] |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
Company name | Eni Rewind SpA |  |  |  |  |
Registered office | San Donato Milanese (MI) |  |  |  |  |
Country of operation | Italy |  |  |  |  |
Share capital |  | 281,857,871.44 |  |  |  |
% Equity ratio | 100.00% |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |
Other activities | Italy | Subsidiaries One [Member] | ENI SpA |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
% Ownership | 99.99% |  |  |  |  |
Other activities | Italy | Subsidiaries Two [Member] |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
Company name | Industria Siciliana Acido Fosforico - ISAF - SpA (in liquidation) |  |  |  |  |
Registered office | Gela (CL) |  |  |  |  |
Country of operation | Italy |  |  |  |  |
Share capital |  | 1,300,000 |  |  |  |
Consolidation or valuation method | Eq. |  |  |  |  |
Other activities | Italy | Subsidiaries Two [Member] | Eni Rewind SpA |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
% Ownership | 52.00% |  |  |  |  |
Other activities | Italy | Subsidiaries Two [Member] | Third parties |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
% Ownership | 48.00% |  |  |  |  |
Other activities | Italy | Subsidiaries Three [Member] |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
Company name | Ing. Luigi Conti Vecchi SpA |  |  |  |  |
Registered office | Assemini (CA) |  |  |  |  |
Country of operation | Italy |  |  |  |  |
Share capital |  | 5,518,620.64 |  |  |  |
% Equity ratio | 100.00% |  |  |  |  |
Consolidation or valuation method | F.C. |  |  |  |  |
Other activities | Italy | Subsidiaries Three [Member] | Eni Rewind SpA |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |
Other activities | Foreign (outside Italy) | Subsidiaries Four [Member] |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
Company name | Eni Rewind International BV |  |  |  |  |
Registered office | Amsterdam (Netherlands) |  |  |  |  |
Country of operation | Netherlands |  |  |  |  |
Share capital |  | € 20,000 |  |  |  |
Consolidation or valuation method | Eq. |  |  |  |  |
Other activities | Foreign (outside Italy) | Subsidiaries Four [Member] | Eni International BV |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |
Other activities | Foreign (outside Italy) | Subsidiaries Five [Member] |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
Company name | Oleodotto del Reno SA |  |  |  |  |
Registered office | Coira (Switzerland) |  |  |  |  |
Country of operation | Switzerland |  |  |  |  |
Share capital | SFr |  |  |  |  | SFr 1,550,000 |
Consolidation or valuation method | Eq. |  |  |  |  |
Other activities | Foreign (outside Italy) | Subsidiaries Five [Member] | Eni Rewind SpA |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |
% Ownership | 100.00% |  |  |  |  |

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