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v3.23.1

Other information about investments - Joint arrangements and associates - Corporate and other activities (Details) | 12 Months Ended |  |
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Dec. 31, 2022 GBP (£) | Dec. 31, 2022 EUR (€) | Dec. 31, 2022 KZT (₸) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 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 | Milan |  |  |  |
Country of operation | Italy |  |  |  |
Share capital | € |  | 501,669,790.83 |  |  |
Consolidation or valuation method | Eq. |  |  |  |
Corporate and financial companies | Italy | Joint Arrangement Or Associate Two [Member] | ENI SpA |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 31.19% |  |  |  |
Corporate and financial companies | Italy | Joint Arrangement Or Associate Two [Member] | Saipem SpA |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 0.02% |  |  |  |
Corporate and financial companies | Italy | Joint Arrangement Or Associate Two [Member] | Third parties |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 68.79% |  |  |  |
Corporate and financial companies | Foreign (outside Italy) | Joint Arrangement Or Associate Three [Member] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
Company name | Avanti Battery Company (b) |  |  |  |
Registered office | Natick (USA) |  |  |  |
Country of operation | USA |  |  |  |
Share capital |  |  |  | $ 683 |
Consolidation or valuation method | Eq. |  |  |  |
Corporate and financial companies | Foreign (outside Italy) | Joint Arrangement Or Associate Four [Member] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
Company name | Commonwealth Fusion Systems Llc (b) |  |  |  |
Registered office | Wilmington (USA) |  |  |  |
Country of operation | USA |  |  |  |
Share capital |  |  |  | 890 |
Consolidation or valuation method | Eq. |  |  |  |
Corporate and financial companies | Foreign (outside Italy) | Joint Arrangement Or Associate Five [Member] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
Company name | Cool Planet Technologies Ltd (b) |  |  |  |
Registered office | London (United Kingdom) |  |  |  |
Country of operation | United Kingdom |  |  |  |
Share capital | £ | £ 1,000 |  |  |  |
Consolidation or valuation method | Eq. |  |  |  |
Corporate and financial companies | Foreign (outside Italy) | Joint Arrangement Or Associate Six [Member] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
Company name | CZero Inc (b) |  |  |  |
Registered office | Wilmington (USA) |  |  |  |
Country of operation | USA |  |  |  |
Share capital |  |  |  | 334 |
Consolidation or valuation method | Eq. |  |  |  |
Corporate and financial companies | Foreign (outside Italy) | Joint Arrangement Or Associate Seven [Member] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
Company name | Form Energy Inc (b) |  |  |  |
Registered office | Somerville (USA) |  |  |  |
Country of operation | USA |  |  |  |
Share capital |  |  |  | 1,129 |
Consolidation or valuation method | Eq. |  |  |  |
Corporate and financial companies | Foreign (outside Italy) | Joint Arrangement Or Associate Eight [Member] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
Company name | M2X Energy Inc(b) (former Obantarla Corp.) |  |  |  |
Registered office | Wilmington (USA) |  |  |  |
Country of operation | USA |  |  |  |
Share capital |  |  |  | 99 |
Consolidation or valuation method | Eq. |  |  |  |
Corporate and financial companies | Foreign (outside Italy) | Joint Arrangement Or Associate Nine [Member] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
Company name | sHYp BV PBC (b) |  |  |  |
Registered office | Wilmington (USA) |  |  |  |
Country of operation | USA |  |  |  |
Share capital |  |  |  | 86 |
Consolidation or valuation method | Eq. |  |  |  |
Corporate and financial companies | Foreign (outside Italy) | Joint Arrangement Or Associate Ten [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 Ten [Member] | EniProgetti SpA |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 49.00% |  |  |  |
Corporate and financial companies | Foreign (outside Italy) | Joint Arrangement Or Associate Ten [Member] | Third parties |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 51.00% |  |  |  |
Corporate and financial companies | Foreign (outside Italy) | Joint Arrangement Or Associate Eleven [Member] |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
Company name | Thiozen Inc (b) |  |  |  |
Registered office | Wilmington (USA) |  |  |  |
Country of operation | USA |  |  |  |
Share capital |  |  |  | $ 351 |
Consolidation or valuation method | Eq. |  |  |  |
Other activities | Italy | Joint Arrangement Or Associate Twelve [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 Twelve [Member] | Eni Rewind SpA |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 50.00% |  |  |  |
Other activities | Italy | Joint Arrangement Or Associate Twelve [Member] | Third parties |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 50.00% |  |  |  |
Other activities | Italy | Joint Arrangement Or Associate Thirteen [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 Thirteen [Member] | Eni Rewind SpA |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 48.55% |  |  |  |
Other activities | Italy | Joint Arrangement Or Associate Thirteen [Member] | Third parties |  |  |  |  |
Joint arrangements and associates |  |  |  |  |
% Ownership | 51.45% |  |  |  |

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