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Other information about investments - Joint arrangements and associates - Global Gas & LNG Portfolio (Details) | 12 Months Ended |  |
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Dec. 31, 2021 USD ($) | Dec. 31, 2021 EUR (€) | Dec. 31, 2021 TND (د.ت) | Dec. 31, 2021 CHF (SFr) | Dec. 31, 2020 EUR (€)
Joint arrangements and associates |  |  |  |  |
Share capital | € |  | € 4,005,000,000 |  |  | € 4,005,000,000
ENI SpA |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
Share capital | € |  | 4,005,358,876 |  |  | € 4,005,358,876
Global Gas & LNG Portfolio | Italy | Joint Arrangement Or Associate One [Member] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
Company name | Mariconsult SpA (†) |  |  |  |
Registered office | Milan |  |  |  |
Country of operation | Italy |  |  |  |
Share capital | € |  | 120,000 |  |  |
Consolidation or valuation method | Eq. |  |  |  |
Global Gas & LNG Portfolio | Italy | Joint Arrangement Or Associate One [Member] | ENI SpA |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 50.00% |  |  |  |
Global Gas & LNG Portfolio | Italy | Joint Arrangement Or Associate One [Member] | Third parties |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 50.00% |  |  |  |
Global Gas & LNG Portfolio | Italy | Joint Arrangement Or Associate Two [Member] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
Company name | Transmed SpA(†) |  |  |  |
Registered office | Milan |  |  |  |
Country of operation | Italy |  |  |  |
Share capital | € |  | 240,000 |  |  |
Consolidation or valuation method | Eq. |  |  |  |
Global Gas & LNG Portfolio | Italy | Joint Arrangement Or Associate Two [Member] | ENI SpA |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 50.00% |  |  |  |
Global Gas & LNG Portfolio | Italy | Joint Arrangement Or Associate Two [Member] | Third parties |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 50.00% |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Three [Member] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
Company name | Angola LNG Supply Services Llc |  |  |  |
Registered office | Wilmington (USA) |  |  |  |
Country of operation | USA |  |  |  |
Share capital | $ | $ 19,278,782 |  |  |  |
Consolidation or valuation method | Eq. |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Three [Member] | Eni USA Gas M Llc |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 13.60% |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Three [Member] | Third parties |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 86.40% |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Four [Member] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
Company name | Blue Stream Pipeline Co BV(†) |  |  |  |
Registered office | Amsterdam (Netherlands) |  |  |  |
Country of operation | Russia |  |  |  |
Share capital | $ | $ 22,000 |  |  |  |
% Equity ratio | 74.62% |  |  |  |
Consolidation or valuation method | J.O. |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Four [Member] | Eni International BV |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 50.00% |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Four [Member] | Third parties |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 50.00% |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Five [Member] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
Company name | Damietta LNG (DLNG) SAE (†) |  |  |  |
Registered office | Damietta (Egypt) |  |  |  |
Country of operation | Egypt |  |  |  |
Share capital | $ | $ 375,000,000 |  |  |  |
% Equity ratio | 50.00% |  |  |  |
Consolidation or valuation method | J.O. |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Five [Member] | Eni Gas Liquef. BV |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 50.00% |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Five [Member] | Third parties |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 50.00% |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Six [Member] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
Company name | GreenStream BV(†) |  |  |  |
Registered office | Amsterdam (Netherlands) |  |  |  |
Country of operation | Libya |  |  |  |
Share capital | € |  | € 200,000,000 |  |  |
% Equity ratio | 50.00% |  |  |  |
Consolidation or valuation method | J.O. |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Six [Member] | Eni North Africa BV |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 50.00% |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Six [Member] | Third parties |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 50.00% |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Seven [Member] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
Company name | Premium Multiservices SA |  |  |  |
Registered office | Tunis (Tunisia) |  |  |  |
Country of operation | Tunisia |  |  |  |
Share capital | د.ت |  |  | د.ت 200,000 |  |
Consolidation or valuation method | Eq. |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Seven [Member] | Sergaz SA |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 49.99% |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Seven [Member] | Third parties |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 50.01% |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Eight [Member] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
Company name | SAMCO Sagl |  |  |  |
Registered office | Lugano (Switzerland) |  |  |  |
Country of operation | Switzerland |  |  |  |
Share capital | SFr |  |  |  | SFr 20,000 |
Consolidation or valuation method | Eq. |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Eight [Member] | Eni International BV |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 5.00% |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Eight [Member] | Transmed Pip Co Ltd |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 90.00% |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Eight [Member] | Third parties |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 5.00% |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Nine [Member] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
Company name | SEGAS Services SAE (†) |  |  |  |
Registered office | Damietta (Egypt) |  |  |  |
Country of operation | Egypt |  |  |  |
Share capital | $ | $ 1,000,000 |  |  |  |
% Equity ratio | 50.00% |  |  |  |
Consolidation or valuation method | J.O. |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Nine [Member] | Eni Gas Liquef. BV |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 1.00% |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Nine [Member] | Damietta LNG (DLNG) SAE |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 98.00% |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Nine [Member] | Third parties |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 1.00% |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Ten [Member] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
Company name | Société Energies Renouvelables Eni-ETAP SA (†) |  |  |  |
Registered office | Tunis (Tunisia) |  |  |  |
Country of operation | Tunisia |  |  |  |
Share capital | د.ت |  |  | د.ت 1,000,000 |  |
Consolidation or valuation method | Eq. |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Ten [Member] | Eni International BV |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 50.00% |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Ten [Member] | Third parties |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 50.00% |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Eleven [Member] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
Company name | Transmediterranean Pipeline Co Ltd (†) |  |  |  |
Registered office | St. Helier (Jersey) |  |  |  |
Country of operation | Jersey |  |  |  |
Share capital | $ | $ 10,310,000 |  |  |  |
% Equity ratio | 50.00% |  |  |  |
Consolidation or valuation method | J.O. |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Eleven [Member] | ENI SpA |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 50.00% |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Eleven [Member] | Third parties |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 50.00% |  |  |  |

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