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Other information about investments - Subsidiaries - Global Gas & LNG Portfolio (Details) | 12 Months Ended |  |
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Dec. 31, 2021 EUR (€) | Dec. 31, 2021 TND (د.ت) | 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
Global Gas & LNG Portfolio | Italy | Subsidiaries One [Member] |  |  |
Subsidiaries |  |  |
Company name | Eni Corridor Srl |  |
Registered office | San Donato Milanese (MI) |  |
Country of operation | Italy |  |
Share capital | € 50,000 |  |
Consolidation or valuation method | Eq. |  |
Global Gas & LNG Portfolio | Italy | Subsidiaries One [Member] | ENI SpA |  |  |
Subsidiaries |  |  |
% Ownership | 100.00% |  |
Global Gas & LNG Portfolio | 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. |  |
Global Gas & LNG Portfolio | Italy | Subsidiaries Two [Member] | ENI SpA |  |  |
Subsidiaries |  |  |
% Ownership | 100.00% |  |
Global Gas & LNG Portfolio | Italy | Subsidiaries Three [Member] |  |  |
Subsidiaries |  |  |
Company name | Eni Global Energy Markets SpA |  |
Registered office | Rome |  |
Country of operation | Italy |  |
Share capital | € 41,233,720 |  |
% Equity ratio | 100.00% |  |
Consolidation or valuation method | F.C. |  |
Global Gas & LNG Portfolio | Italy | Subsidiaries Three [Member] | ENI SpA |  |  |
Subsidiaries |  |  |
% Ownership | 100.00% |  |
Global Gas & LNG Portfolio | Italy | Subsidiaries Four [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. |  |
Global Gas & LNG Portfolio | Italy | Subsidiaries Four [Member] | ENI SpA |  |  |
Subsidiaries |  |  |
% Ownership | 100.00% |  |
Global Gas & LNG Portfolio | Italy | Subsidiaries Five [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. |  |
Global Gas & LNG Portfolio | Italy | Subsidiaries Five [Member] | ENI SpA |  |  |
Subsidiaries |  |  |
% Ownership | 100.00% |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Subsidiaries Six [Member] |  |  |
Subsidiaries |  |  |
Company name | Eni España Comercializadora De Gas SAU |  |
Registered office | Madrid (Spain) |  |
Country of operation | Spain |  |
Share capital | € 2,340,240 |  |
% Equity ratio | 100.00% |  |
Consolidation or valuation method | F.C. |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Subsidiaries Six [Member] | ENI SpA |  |  |
Subsidiaries |  |  |
% Ownership | 100.00% |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Subsidiaries Seven [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. |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Subsidiaries Seven [Member] | Eni International BV |  |  |
Subsidiaries |  |  |
% Ownership | 100.00% |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Subsidiaries Eight [Member] |  |  |
Subsidiaries |  |  |
Company name | Eni Gas Liquefaction BV |  |
Registered office | Amsterdam (Netherlands) |  |
Country of operation | Netherlands |  |
Share capital | € 20,000 |  |
% Equity ratio | 100.00% |  |
Consolidation or valuation method | F.C. |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Subsidiaries Eight [Member] | Eni International BV |  |  |
Subsidiaries |  |  |
% Ownership | 100.00% |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Subsidiaries Nine [Member] |  |  |
Subsidiaries |  |  |
Company name | Société de Service du Gazoduc Transtunisien SA - Sergaz SA |  |
Registered office | Tunis (Tunisia) |  |
Country of operation | Tunisia |  |
Share capital | د.ت |  | د.ت 99,000 |
% Equity ratio | 66.67% |  |
Consolidation or valuation method | F.C. |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Subsidiaries Nine [Member] | Eni International BV |  |  |
Subsidiaries |  |  |
% Ownership | 66.67% |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Subsidiaries Nine [Member] | Third parties |  |  |
Subsidiaries |  |  |
% Ownership | 33.33% |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Subsidiaries Ten [Member] |  |  |
Subsidiaries |  |  |
Company name | Société pour la Construction du Gazoduc Transtunisien SA - Scogat SA |  |
Registered office | Tunis (Tunisia) |  |
Country of operation | Tunisia |  |
Share capital | د.ت |  | د.ت 200,000 |
% Equity ratio | 100.00% |  |
Consolidation or valuation method | F.C. |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Subsidiaries Ten [Member] | ENI SpA |  |  |
Subsidiaries |  |  |
% Ownership | 0.05% |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Subsidiaries Ten [Member] | Eni International BV |  |  |
Subsidiaries |  |  |
% Ownership | 99.85% |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Subsidiaries Ten [Member] | LNG Shipping SpA |  |  |
Subsidiaries |  |  |
% Ownership | 0.05% |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Subsidiaries Ten [Member] | Trans Tunis P Co SpA |  |  |
Subsidiaries |  |  |
% Ownership | 0.05% |  |

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