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Other information about investments - Joint arrangements and associates - Corporate and other activities (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 PKR (₨) | Dec. 31, 2019 TND (د.ت) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 EUR (€) | Dec. 31, 2018 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
Corporate and financial companies | Foreign (outside Italy) | Joint Arrangement Or Associate One [Member] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
Company name | Commonwealth Fusion Systems Llc (a) |  |  |  |
Registered office | Wilmington (USA) |  |  |  |
Country of operation | USA |  |  |  |
Share capital |  |  | $ 115,000,519 |  |
Consolidation or valuation method | Eq. |  |  |  |
Corporate and financial companies | Foreign (outside Italy) | Joint Arrangement Or Associate One [Member] | Eni Next Llc [Member] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
Share capital |  |  | 50,000,000 |  |
Corporate and financial companies | Foreign (outside Italy) | Joint Arrangement Or Associate Two [Member] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
Company name | Form Energy Inc (b) |  |  |  |
Registered office | Sommerville (USA) |  |  |  |
Country of operation | USA |  |  |  |
Share capital |  |  | 50,889,548.24 |  |
Consolidation or valuation method | Eq. |  |  |  |
Corporate and financial companies | Foreign (outside Italy) | Joint Arrangement Or Associate Two [Member] | Eni Next Llc [Member] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
Share capital |  |  | 15,000,000 |  |
Other activities | Italy | Joint Arrangement Or Associate Three [Member] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
Company name | Ottana Sviluppo ScpA (in bankruptcy) |  |  |  |
Registered office | Nuoro |  |  |  |
Country of operation | Italy |  |  |  |
Share capital | € |  |  |  | 516,000 |
Consolidation or valuation method | Eq. |  |  |  |
Other activities | Italy | Joint Arrangement Or Associate Three [Member] | Eni Rewind SpA |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 30.00% |  |  |  |
Other activities | Italy | Joint Arrangement Or Associate Three [Member] | Third parties |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 70.00% |  |  |  |
Other activities | Italy | Joint Arrangement Or Associate Four [Member] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
Company name | Progetto Nuraghe Scarl |  |  |  |
Registered office | Porto Torres (SS) |  |  |  |
Country of operation | Italy |  |  |  |
Share capital | € |  |  |  | 10,000 |
Consolidation or valuation method | Eq. |  |  |  |
Other activities | Italy | Joint Arrangement Or Associate Four [Member] | Eni Rewind SpA |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 48.55% |  |  |  |
Other activities | Italy | Joint Arrangement Or Associate Four [Member] | Third parties |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 51.45% |  |  |  |
Other activities | Italy | Joint Arrangement Or Associate Five [Member] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
Company name | Saipem SpA (#) (†) |  |  |  |
Registered office | San Donato Milanese (MI) |  |  |  |
Country of operation | Italy |  |  |  |
Share capital | € |  |  |  | € 2,191,384,693 |
Consolidation or valuation method | Eq. |  |  |  |
Other activities | Italy | Joint Arrangement Or Associate Five [Member] | ENI SpA |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 30.54% |  |  |  |
% Equity ratio | 30.99% |  |  |  |
Other activities | Italy | Joint Arrangement Or Associate Five [Member] | Third parties |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 68.00% |  |  |  |
% Equity ratio | 69.01% |  |  |  |
Other activities | Italy | Joint Arrangement Or Associate Five [Member] | Saipem SpA |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 1.46% |  |  |  |
Other activities | Foreign (outside Italy) | Joint Arrangement Or Associate Six [Member] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
Company name | Ayla Energy Ltd (†) |  |  |  |
Registered office | London (United Kingdom) |  |  |  |
Country of operation | United Kingdom |  |  |  |
Share capital |  |  | 1,000 |  |
Consolidation or valuation method | Eq. |  |  |  |
Other activities | Foreign (outside Italy) | Joint Arrangement Or Associate Six [Member] | Third parties |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 50.00% |  |  |  |
Other activities | Foreign (outside Italy) | Joint Arrangement Or Associate Six [Member] | Eni En. Solutions BV [Member] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 50.00% |  |  |  |
Other activities | Foreign (outside Italy) | Joint Arrangement Or Associate Seven [Member] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
Company name | Grid Edge (Private) Ltd(†) |  |  |  |
Registered office | Saddar Town - Karachi (Pakistan) |  |  |  |
Country of operation | Pakistan |  |  |  |
Share capital | ₨ | ₨ 1,200,000 |  |  |  |
Consolidation or valuation method | Eq. |  |  |  |
Other activities | Foreign (outside Italy) | Joint Arrangement Or Associate Seven [Member] | Third parties |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 60.00% |  |  |  |
Other activities | Foreign (outside Italy) | Joint Arrangement Or Associate Seven [Member] | Eni International BV |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 40.00% |  |  |  |
Other activities | Foreign (outside Italy) | Joint Arrangement Or Associate Eight [Member] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
Company name | Société Energies Renouvelables Eni-ETAP SA (†) |  |  |  |
Registered office | Tunisi (Tunisia) |  |  |  |
Country of operation | Tunisia |  |  |  |
Share capital | د.ت |  | د.ت 1,000,000 |  |  |
Consolidation or valuation method | Eq. |  |  |  |
Other activities | Foreign (outside Italy) | Joint Arrangement Or Associate Eight [Member] | Third parties |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 50.00% |  |  |  |
Other activities | Foreign (outside Italy) | Joint Arrangement Or Associate Eight [Member] | Eni International BV |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 50.00% |  |  |  |
Other activities | Foreign (outside Italy) | Joint Arrangement Or Associate Nine [Member] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
Company name | Solenova Ltd (†) |  |  |  |
Registered office | London (United Kingdom) |  |  |  |
Country of operation | United Kingdom |  |  |  |
Share capital |  |  | $ 20,000 |  |
Consolidation or valuation method | Eq. |  |  |  |
Other activities | Foreign (outside Italy) | Joint Arrangement Or Associate Nine [Member] | Third parties |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 50.00% |  |  |  |
Other activities | Foreign (outside Italy) | Joint Arrangement Or Associate Nine [Member] | Eni En. Solutions BV [Member] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 50.00% |  |  |  |

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