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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, 2020 CHF (SFr) | Dec. 31, 2020 TND (د.ت) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 EUR (€) | Dec. 31, 2019 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] | Third parties |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 86.40% |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Three [Member] | Eni USA Gas M Llc [Member] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 13.60% |  |  |  |
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] | Third parties |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 50.00% |  |  |  |
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 Five [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 Five [Member] | Third parties |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 50.00% |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Five [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] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
Company name | Premium Multiservices SA |  |  |  |
Registered office | Tunisi (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 Six [Member] | Third parties |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 50.01% |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Six [Member] | Sergaz SA [Member] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 49.99% |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Seven [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 Seven [Member] | Third parties |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 5.00% |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Seven [Member] | Eni International BV |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 5.00% |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Seven [Member] | Transmed Pip Co Ltd [Member] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 90.00% |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Eight [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 Eight [Member] | ENI SpA |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 50.00% |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Eight [Member] | Third parties |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 50.00% |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Nine [Member] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
Company name | Unión Fenosa Gas SA(†) |  |  |  |
Registered office | Madrid (Spain) |  |  |  |
Country of operation | Spain |  |  |  |
Share capital |  |  |  | € 32,772,000 |
Consolidation or valuation method | Eq. |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Nine [Member] | ENI SpA |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 50.00% |  |  |  |
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Nine [Member] | Third parties |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 50.00% |  |  |  |

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