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Other information about investments - Joint arrangements and associates - Corporate and other activities (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2021 EUR (€) | Dec. 31, 2021 KZT (₸) | 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
Corporate and financial companies | Italy | Joint Arrangement Or Associate One [Member] |  |  |  |
Joint arrangements and associates |  |  |  |
Company name | Consorzio per l'attuazione del Progetto Divertor Tokamak Test DTT Scarl (†) |  |  |
Registered office | Frascati (RM) |  |  |
Country of operation | Italy |  |  |
Share capital | € |  | 1,000,000 |  |
Consolidation or valuation method | Co. |  |  |
Corporate and financial companies | Italy | Joint Arrangement Or Associate One [Member] | ENI SpA |  |  |  |
Joint arrangements and associates |  |  |  |
% Ownership | 25.00% |  |  |
Corporate and financial companies | Italy | Joint Arrangement Or Associate One [Member] | Third parties |  |  |  |
Joint arrangements and associates |  |  |  |
% Ownership | 75.00% |  |  |
Corporate and financial companies | Italy | Joint Arrangement Or Associate Two [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. |  |  |
Corporate and financial companies | Italy | Joint Arrangement Or Associate Two [Member] | ENI SpA |  |  |  |
Joint arrangements and associates |  |  |  |
% Ownership | 30.54% |  |  |
% Equity ratio | 31.20% |  |  |
Corporate and financial companies | Italy | Joint Arrangement Or Associate Two [Member] | Saipem SpA |  |  |  |
Joint arrangements and associates |  |  |  |
% Ownership | 2.12% |  |  |
Corporate and financial companies | Italy | Joint Arrangement Or Associate Two [Member] | Third parties |  |  |  |
Joint arrangements and associates |  |  |  |
% Ownership | 67.34% |  |  |
% Equity ratio | 68.80% |  |  |
Corporate and financial companies | Foreign (outside Italy) | Joint Arrangement Or Associate Three [Member] |  |  |  |
Joint arrangements and associates |  |  |  |
Company name | Commonwealth Fusion Systems Llc |  |  |
Registered office | Wilmington (USA) |  |  |
Country of operation | USA |  |  |
Share capital | $ | $ 215,000,514.83 |  |  |
Consolidation or valuation method | Eq. |  |  |
Corporate and financial companies | Foreign (outside Italy) | Joint Arrangement Or Associate Four [Member] |  |  |  |
Joint arrangements and associates |  |  |  |
Company name | CZero Inc |  |  |
Registered office | Wilmington (USA) |  |  |
Country of operation | USA |  |  |
Share capital | $ | $ 8,116,660.78 |  |  |
Consolidation or valuation method | Eq. |  |  |
Corporate and financial companies | Foreign (outside Italy) | Joint Arrangement Or Associate Five [Member] |  |  |  |
Joint arrangements and associates |  |  |  |
Company name | Form Energy Inc |  |  |
Registered office | Somerville (USA) |  |  |
Country of operation | USA |  |  |
Share capital | $ | $ 328,901,396.67 |  |  |
Consolidation or valuation method | Eq. |  |  |
Corporate and financial companies | Foreign (outside Italy) | Joint Arrangement Or Associate Six [Member] |  |  |  |
Joint arrangements and associates |  |  |  |
Company name | Obantarla Corp. |  |  |
Registered office | Wilmington (USA) |  |  |
Country of operation | USA |  |  |
Share capital | $ | $ 20,499,995 |  |  |
Consolidation or valuation method | Eq. |  |  |
Corporate and financial companies | Foreign (outside Italy) | Joint Arrangement Or Associate Seven [Member] |  |  |  |
Joint arrangements and associates |  |  |  |
Company name | sHYp BV PBC |  |  |
Registered office | Wilmington (USA) |  |  |
Country of operation | USA |  |  |
Share capital | $ | $ 3,000,000 |  |  |
Consolidation or valuation method | Eq. |  |  |
Corporate and financial companies | Foreign (outside Italy) | Joint Arrangement Or Associate Eight [Member] |  |  |  |
Joint arrangements and associates |  |  |  |
Company name | Tecninco Engineering Contractors Llp (†) |  |  |
Registered office | Aksai (Kazakhstan) |  |  |
Country of operation | Kazakhstan |  |  |
Share capital | ₸ |  |  | ₸ 29,478,455 |
Consolidation or valuation method | Eq. |  |  |
Corporate and financial companies | Foreign (outside Italy) | Joint Arrangement Or Associate Eight [Member] | EniProgetti SpA |  |  |  |
Joint arrangements and associates |  |  |  |
% Ownership | 49.00% |  |  |
Corporate and financial companies | Foreign (outside Italy) | Joint Arrangement Or Associate Eight [Member] | Third parties |  |  |  |
Joint arrangements and associates |  |  |  |
% Ownership | 51.00% |  |  |
Corporate and financial companies | Foreign (outside Italy) | Joint Arrangement Or Associate Nine [Member] |  |  |  |
Joint arrangements and associates |  |  |  |
Company name | Thiozen Inc |  |  |
Registered office | Wilmington (USA) |  |  |
Country of operation | USA |  |  |
Share capital | $ | $ 2,999,987.81 |  |  |
Consolidation or valuation method | Eq. |  |  |
Other activities | Italy | Joint Arrangement Or Associate One [Member] |  |  |  |
Joint arrangements and associates |  |  |  |
Company name | HEA SpA (†) |  |  |
Registered office | Bologna |  |  |
Country of operation | Italy |  |  |
Share capital | € |  | 50,000 |  |
Consolidation or valuation method | Co. |  |  |
Other activities | Italy | Joint Arrangement Or Associate One [Member] | Eni Rewind SpA |  |  |  |
Joint arrangements and associates |  |  |  |
% Ownership | 50.00% |  |  |
Other activities | Italy | Joint Arrangement Or Associate One [Member] | Third parties |  |  |  |
Joint arrangements and associates |  |  |  |
% Ownership | 50.00% |  |  |
Other activities | Italy | Joint Arrangement Or Associate Two [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 Two [Member] | Eni Rewind SpA |  |  |  |
Joint arrangements and associates |  |  |  |
% Ownership | 48.55% |  |  |
Other activities | Italy | Joint Arrangement Or Associate Two [Member] | Third parties |  |  |  |
Joint arrangements and associates |  |  |  |
% Ownership | 51.45% |  |  |

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