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Other information about investments (Details 2) | 12 Months Ended |  |
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Dec. 31, 2018 EUR (€) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 GBP (£) | Dec. 31, 2018 CHF (SFr) | Dec. 31, 2018 EGP (ج.م.) | Dec. 31, 2018 VEF ( ) | Dec. 31, 2018 TND (د.ت) | Dec. 31, 2018 SGD ($) | Dec. 31, 2018 RUB (₽) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2018 INR (₨) | Dec. 31, 2018 TRY (₺) | Dec. 31, 2018 CDF (CF) | Dec. 31, 2018 HUF (Ft) | Dec. 31, 2017 EUR (€)
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  | € 4,005,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | € 4,005,000,000
% Ownership |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Eni Duetsch GmbH [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni Deutsch.GmbH |  |  |  |  |  |  |  |  |  |  |  |  |  |
Eni Oil Holdings BV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Eni Mineral GMBH [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni Mineralölh.GmbH |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company name |  | Ecofuel SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | San Donato Milanese (MI) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  | € 52,000,000 | $ 394,000 |  |  |  |  |  |  |  |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries One [Member] | Eni SpA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries One [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company name |  | Eni Fuel SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Rome |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  | € 58,944,310 | 6,642,928.32 |  |  |  |  |  |  |  |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Two [Member] | Eni SpA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Two [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Two [Member] | Ecofuel SpA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Ecofuel SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Three [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company name |  | Raffineria di Gela SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Gela (CL) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  | € 15,000,000 | 102,000 |  |  |  |  |  |  |  |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Three [Member] | Eni SpA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Three [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Four [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company name |  | SeaPad SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Genova |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  | € 12,400,000 | 26,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Equity ratio |  | 65.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Four [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Four [Member] | Ecofuel SpA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Ecofuel SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Five [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company name |  | Servizi Fondo Bombole Metano SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Rome |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  | € 13,580,000.20 | 2,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | Co. |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Five [Member] | Eni SpA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Five [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Six [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Livorno |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital | $ |  |  | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Six [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Six [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Seven [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Genova |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital | $ |  |  | 156,000 |  |  |  |  |  |  |  |  |  |  |  |  |
% Equity ratio |  | 68.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Seven [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Seven [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 75.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Seven [Member] | Eni Duetsch GmbH [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Seven [Member] | Ecofuel SpA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Ecofuel SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eight [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Genova |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital | $ |  |  | 2,068,000 |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eight [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eight [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eight [Member] | Ecofuel SpA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Ecofuel SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Nine [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Milazzo (ME) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital | $ |  |  | 171,143,000 |  |  |  |  |  |  |  |  |  |  |  |  |
% Equity ratio |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Nine [Member] | Eni SpA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Nine [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Nine [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 89.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Nine [Member] | Eni Oil Holdings BV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 11.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Ten [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Fiumicino (RM) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital | $ |  |  | 852,000 |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Ten [Member] | Eni SpA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Ten [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Ten [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 99.93% |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Ten [Member] | Esain SA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 0.07% |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eleven [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Genova |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital | $ |  |  | 3,326,900 |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eleven [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eleven [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eleven [Member] | Ecofuel SpA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Ecofuel SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Twelve [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | San Donato Milanese (MI) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital | $ |  |  | 3,085,000 |  |  |  |  |  |  |  |  |  |  |  |  |
% Equity ratio |  | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Twelve [Member] | Eni SpA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Twelve [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Twelve [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Thirteen [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Milazzo (ME) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital | $ |  |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
% Equity ratio |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Thirteen [Member] | Raff Milazzo ScpA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Raff. Milazzo ScpA |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Thirteen [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Fourteen [Member] | Eni Mineral GMBH [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 99.99% |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Fifteen [Member] | Eni Austria GmbH [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Sixteen [Member] | Eni Duetsch GmbH [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Seventeen [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eighteen [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Nineteen [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 13.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Nineteen [Member] | Eni Ecuador SA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 87.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Twenty [Member] | Eni Ecuador SA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 99.99% |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Twenty One [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Twenty Two [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 99.01% |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Twenty Two [Member] | Eni Oil Holdings BV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 0.99% |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Twenty Three [Member] | Eni Ecuador SA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 99.99% |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Chemicals [Member] | Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company name |  | Versalis SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | San Donato Milanese (MI) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  | € 1,364,790,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Chemicals [Member] | Subsidiaries One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company name |  | Consorzio Industriale Gas Naturale (in liquidation) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | San Donato Milanese (MI) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  | € 124,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Chemicals [Member] | Subsidiaries One [Member] | Versalis SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Versalis SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Chemicals [Member] | Subsidiaries One [Member] | Raff di Gela SpA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Raff. di Gela SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 18.74% |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Chemicals [Member] | Subsidiaries One [Member] | Eni SpA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 15.37% |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Chemicals [Member] | Subsidiaries One [Member] | Syndial SpA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Syndial SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 0.76% |  |  |  |  |  |  |  |  |  |  |  |  |  |
In Italy [Member] | Chemicals [Member] | Subsidiaries One [Member] | Raff Milazzo ScpA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Raff. Milazzo ScpA |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 11.58% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Schwedt (Germany) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  | € 27,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries One [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Vohburg (Germany) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  | € 10,226,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Equity ratio |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Two [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Two [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Three [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Rivera (Switzerland) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital | SFr |  |  |  |  | SFr 6,000,000 |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Three [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Four [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Cairo (Egypt) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital | ج.م. |  |  |  |  |  | ج.م. 100,000,000 |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Four [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Four [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Four [Member] | Eni Oil Holdings BV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni Oil Holdings BV |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Five [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Singapore (Singapore) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital | $ |  |  |  |  |  |  |  |  | $ 12,000,000 |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Five [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Five [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Six [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company name |  | Eni Abu Dhabi Refining & Trading BV |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Amsterdam (Netherlands) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | Netherlands |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  | € 20,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Six [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Six [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Six [Member] | Eni Austria GmbH [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni Austria GmbH |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Seven [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company name |  | Eni Austria GmbH |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Wien (Austria) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | Austria |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  | € 78,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Seven [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Seven [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Seven [Member] | Eni Duetsch GmbH [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni Deutsch.GmbH |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eight [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company name |  | Eni Benelux BV |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Rotterdam (Netherlands) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | Netherlands |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  | € 1,934,040 |  |  |  |  |  | د.ت 1,000,000 |  |  |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eight [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eight [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Nine [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company name |  | Eni Deutschland GmbH |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | Germany |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  | € 90,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Nine [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Nine [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Nine [Member] | Eni Duetsch GmbH [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Munich (Germany) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Nine [Member] | Eni Oil Holdings BV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | Eni Oil Holdings BV |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Ten [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company name |  | Eni Ecuador SA |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Quito (Ecuador) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | Ecuador |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  |  | 103,142.08 |  | 420,000 |  |  |  |  |  |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Ten [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Ten [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Ten [Member] | Esain SA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Esain SA |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eleven [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company name |  | Eni France Sàrl |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Lyon (France) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | France |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  | € 56,800,000 |  |  |  |  | 120,867 |  |  |  |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eleven [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eleven [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eleven [Member] | Ecofuel SpA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Ecofuel SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Twelve [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company name |  | Eni Iberia SLU |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Alcobendas (Spain) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | Spain |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  | € 17,299,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Twelve [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Twelve [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Thirteen [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company name |  | Eni Lubricants Trading (Shanghai) Co Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Shanghai (China) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | China |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  | € 409,034 |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Thirteen [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Thirteen [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Fourteen [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company name |  | Eni Marketing Austria GmbH |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Wien (Austria) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | Austria |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  | € 19,621,665.23 |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Fourteen [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Fifteen [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company name |  | Eni Mineralölhandel GmbH |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Wien (Austria) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | Austria |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  | € 34,156,232.06 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni Austria GmbH |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Sixteen [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company name |  | Eni Schmiertechnik GmbH |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Wurzburg (Germany) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | Germany |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  | € 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Seventeen [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company name |  | Eni Suisse SA |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Lausanne (Switzerland) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | Switzerland |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital | SFr |  |  |  |  | 102,500,000 |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Seventeen [Member] | Eni International BV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Seventeen [Member] | Eni Oil Holdings BV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni Oil Holdings BV |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eighteen [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company name |  | Eni USA R&M Co Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Wilmington (USA) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | USA |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital | $ |  |  | 11,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Nineteen [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company name |  | Esacontrol SA |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Quito (Ecuador) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | Ecuador |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital | $ |  |  | 60,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Nineteen [Member] | Eni Ecuador SA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni Ecuador SA |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Twenty [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company name |  | Esain SA |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Quito (Ecuador) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | Ecuador |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital | $ |  |  | 30,000 |  |  |  |  |  |  |  |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Twenty One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company name |  | Oléoduc du Rhône SA |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Valais (Switzerland) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | Switzerland |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital | SFr |  |  |  |  | SFr 7,000,000 |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni International BV |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Twenty Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company name |  | OOO “Eni-Nefto” |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Moscow (Russia) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | Russia |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital | ₽ |  |  |  |  |  |  |  |  |  | ₽ 1,010,000 |  |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Twenty Three [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company name |  | Tecnoesa SA |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Quito (Ecuador) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | Ecuador |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital | $ |  |  | 36,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemicals [Member] | Subsidiaries One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company name |  | Dunastyr Polisztirolgyártó Zártkörûen Mûködõ Részvénytársaság |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Budapest (Hungary) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | Hungary |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital | Ft |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Ft 8,092,160,000 |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemicals [Member] | Subsidiaries One [Member] | Versalis SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Versalis SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 96.34% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemicals [Member] | Subsidiaries One [Member] | Versalis Deutsc GmbH [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Versalis Deutsc.GmbH |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 1.83% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemicals [Member] | Subsidiaries One [Member] | Versalis Int SA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Versalis Int.SA |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 1.83% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemicals [Member] | Subsidiaries Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company name |  | Versalis Americas Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Dover, Delaware (USA) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | USA |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital | $ |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemicals [Member] | Subsidiaries Two [Member] | Versalis International SA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Versalis International SA |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemicals [Member] | Subsidiaries Three [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company name |  | Versalis Congo Sarlu |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Pointe-Noire (Republic of the Congo) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | Republic of the Congo |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital | CF |  |  |  |  |  |  |  |  |  |  |  |  |  | CF 1,000,000 |  |
% Ownership |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemicals [Member] | Subsidiaries Three [Member] | Versalis International SA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Versalis International SA |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemicals [Member] | Subsidiaries Four [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company name |  | Versalis Deutschland GmbH |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Eschborn (Germany) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | Germany |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  | € 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Versalis SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemicals [Member] | Subsidiaries Five [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company name |  | Versalis France SAS |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Mardyck (France) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | France |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  | € 126,115,582.90 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Versalis SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemicals [Member] | Subsidiaries Six [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company name |  | Versalis International SA |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Bruxelles (Belgium) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | Belgium |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  | € 15,449,173.88 |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemicals [Member] | Subsidiaries Six [Member] | Versalis SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Versalis SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 59.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemicals [Member] | Subsidiaries Six [Member] | Versalis Deutsc GmbH [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Versalis Deutsc.GmbH |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 23.71% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemicals [Member] | Subsidiaries Six [Member] | Dunastyr Zrt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Dunastyr Zrt |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 14.43% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemicals [Member] | Subsidiaries Six [Member] | Versalis France [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Versalis France |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 2.86% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemicals [Member] | Subsidiaries Seven [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company name |  | Versalis Kimya Ticaret Limited Sirketi |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Istanbul (Turkey) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | Turkey |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital | ₺ |  |  |  |  |  |  |  |  |  |  |  |  | ₺ 20,000 |  |  |
Shareholders |  | Versalis Int.SA |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemicals [Member] | Subsidiaries Eight [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company name |  | Versalis Pacific (India) Private Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Mumbai (India) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | India |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital | ₨ |  |  |  |  |  |  |  |  |  |  |  | ₨ 238,700 |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemicals [Member] | Subsidiaries Eight [Member] | Versalis Sing. P. Ltd [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Versalis Sing. P. Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 99.99% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemicals [Member] | Subsidiaries Eight [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemicals [Member] | Subsidiaries Nine [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company name |  | Versalis Pacific Trading (Shanghai) Co Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Shanghai (China) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | China |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital | ¥ |  |  |  |  |  |  |  |  |  |  | ¥ 1,000,000 |  |  |  |  |
Shareholders |  | Versalis SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemicals [Member] | Subsidiaries Ten [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company name |  | Versalis Singapore Pte Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | Singapore (Singapore) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | Singapore |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital | $ |  |  |  |  |  |  |  |  | $ 80,000 |  |  |  |  |  |  |
Shareholders |  | Versalis SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemicals [Member] | Subsidiaries Eleven [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company name |  | Versalis UK Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered office |  | London (United Kingdom) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country of operation |  | United Kingdom |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital | £ |  |  |  | £ 4,004,042 |  |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Versalis SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | F.C. = full consolidation, J.O. = joint operation, Eq. = equity-accounted, Co. = valued at cost, F.V. = valued at fair value

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