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Other information about investments (Details 10)
 12 Months Ended
Dec. 31, 2018
EUR (€)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
GBP (£)
Dec. 31, 2018
SAR (ر.س)
Dec. 31, 2018
CHF (SFr)
Dec. 31, 2018
GHS (GH₵)
Dec. 31, 2017
EUR (€)
Disclosure of subsidiaries [line items]              
Share capital € 4,005,000,000           € 4,005,000,000
In Italy [Member] | Subsidiaries One [Member]              
Disclosure of subsidiaries [line items]              
Share capital € 36,149            
In Italy [Member] | Subsidiaries One [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Company name Consorzio Nazionale per la Gestione Raccolta e Trattamento degli Oli Minerali Usati            
Registered office Rome            
Country of operation Italy            
Consolidation or valutation method [1] F.V.            
In Italy [Member] | Subsidiaries One [Member] | ENI SPAs [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Name of Shareholders Eni SpA            
% Ownership 12.43%            
In Italy [Member] | Subsidiaries One [Member] | Third parties [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Name of Shareholders Third parties            
% Ownership 87.57%            
In Italy [Member] | Subsidiaries Two [Member]              
Disclosure of subsidiaries [line items]              
Share capital € 360,000,000            
In Italy [Member] | Subsidiaries Two [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Company name [2] Societa Italiana Oleodotti di Gaeta SpA            
Registered office Rome            
Country of operation Italy            
Consolidation or valutation method [1] F.V.            
In Italy [Member] | Subsidiaries Two [Member] | ENI SPAs [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Name of Shareholders Eni SpA            
% Ownership 72.48%            
In Italy [Member] | Subsidiaries Two [Member] | Third parties [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Name of Shareholders Third parties            
% Ownership 27.52%            
Outside Italy [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Company name Tema Lube Oil Co Ltd            
Consolidation or valutation method [1] F.V.            
Outside Italy [Member] | Subsidiaries One [Member]              
Disclosure of subsidiaries [line items]              
Share capital € 89.199            
Outside Italy [Member] | Subsidiaries One [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Company name BFS Berlin Fuelling Services GbR            
Registered office Hamburg  (Germany)            
Country of operation Germany            
Consolidation or valutation method [1] F.V.            
Outside Italy [Member] | Subsidiaries One [Member] | Third parties [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Name of Shareholders Third parties            
% Ownership 87.50%            
Outside Italy [Member] | Subsidiaries One [Member] | Eni Deutsch GmbH [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Name of Shareholders Eni Deutsch.GmbH            
% Ownership 12.50%            
Outside Italy [Member] | Subsidiaries Two [Member]              
Disclosure of subsidiaries [line items]              
Share capital | $   $ 3,028,749          
Outside Italy [Member] | Subsidiaries Two [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Company name Compania de Economia Mixta ‘Austrogas’            
Registered office Cuenca  (Ecuador)            
Country of operation Ecuador            
Consolidation or valutation method [1] F.V.            
Outside Italy [Member] | Subsidiaries Two [Member] | Third parties [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Name of Shareholders Third parties            
% Ownership 86.69%            
Outside Italy [Member] | Subsidiaries Two [Member] | Eni Ecuador SA [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Name of Shareholders Eni Ecuador SA            
% Ownership 13.31%            
Outside Italy [Member] | Subsidiaries Three [Member]              
Disclosure of subsidiaries [line items]              
Share capital € 3,954,196.40            
Outside Italy [Member] | Subsidiaries Three [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Company name Dépôt Pétrolier de Fos SA            
Registered office Fos-Sur-Mer  (France)            
Country of operation France            
Consolidation or valutation method [1] F.V.            
Outside Italy [Member] | Subsidiaries Three [Member] | Third parties [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Name of Shareholders Third parties            
% Ownership 83.19%            
Outside Italy [Member] | Subsidiaries Three [Member] | Eni France Sarl [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Name of Shareholders Eni France Sàrl            
% Ownership 16.81%            
Outside Italy [Member] | Subsidiaries Four [Member]              
Disclosure of subsidiaries [line items]              
Share capital € 207,500            
Outside Italy [Member] | Subsidiaries Four [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Company name Dépôt Pétrolier de la Côte d’Azur SAS            
Registered office Nanterre  (France)            
Country of operation France            
Consolidation or valutation method [1] F.V.            
Outside Italy [Member] | Subsidiaries Four [Member] | Third parties [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Name of Shareholders Third parties            
% Ownership 82.00%            
Outside Italy [Member] | Subsidiaries Four [Member] | Eni France Sarl [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Name of Shareholders Eni France Sàrl            
% Ownership 18.00%            
Outside Italy [Member] | Subsidiaries Five [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Company name Joint Inspection Group Ltd            
Registered office London  (United Kingdom)            
Country of operation United Kingdom            
Share capital | £ [3]     £ 0        
Consolidation or valutation method [1] F.V.            
Outside Italy [Member] | Subsidiaries Five [Member] | ENI SPAs [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Name of Shareholders Eni SpA            
% Ownership 12.50%            
Outside Italy [Member] | Subsidiaries Five [Member] | Third parties [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Name of Shareholders Third parties            
% Ownership 87.50%            
Outside Italy [Member] | Subsidiaries Six [Member]              
Disclosure of subsidiaries [line items]              
Share capital | ر.س       ر.س 1,200,000,000      
Outside Italy [Member] | Subsidiaries Six [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Company name Saudi European Petrochemical Company 'IBN ZAHR'            
Registered office Al Jubail  (Saudi Arabia)            
Country of operation Saudi Arabia            
Consolidation or valutation method [1] F.V.            
Outside Italy [Member] | Subsidiaries Six [Member] | Third parties [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Name of Shareholders Third parties            
% Ownership 90.00%            
Outside Italy [Member] | Subsidiaries Six [Member] | Ecofuel SpA [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Name of Shareholders Ecofuel SpA            
% Ownership 10.00%            
Outside Italy [Member] | Subsidiaries Seven [Member]              
Disclosure of subsidiaries [line items]              
Share capital € 40,000            
Outside Italy [Member] | Subsidiaries Seven [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Company name S.I.P.G. Société Immobilier Pétrolier de Gestion Snc            
Registered office Tremblay-En-France  (France)            
Country of operation France            
Consolidation or valutation method [1] F.V.            
Outside Italy [Member] | Subsidiaries Seven [Member] | Third parties [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Name of Shareholders Third parties            
% Ownership 87.50%            
Outside Italy [Member] | Subsidiaries Seven [Member] | Eni France Sarl [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Name of Shareholders Eni France Sàrl            
% Ownership 12.50%            
Outside Italy [Member] | Subsidiaries Eight [Member]              
Disclosure of subsidiaries [line items]              
Share capital € 175,713            
Outside Italy [Member] | Subsidiaries Eight [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Company name Sistema Integrado de Gestion de Aceites Usados            
Registered office Madrid  (Spain)            
Country of operation Spain            
Consolidation or valutation method [1] F.V.            
Outside Italy [Member] | Subsidiaries Eight [Member] | Third parties [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Name of Shareholders Third parties            
% Ownership 84.56%            
Outside Italy [Member] | Subsidiaries Eight [Member] | Eni Iberia SLU [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Name of Shareholders Eni Iberia SLU            
% Ownership 15.44%            
Outside Italy [Member] | Subsidiaries Nine [Member]              
Disclosure of subsidiaries [line items]              
Share capital € 4.953            
Outside Italy [Member] | Subsidiaries Nine [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Company name Tanklager - Gesellschaft  Tegel (TGT) GbR            
Registered office Hamburg  (Germany)            
Country of operation Germany            
Consolidation or valutation method [1] F.V.            
Outside Italy [Member] | Subsidiaries Nine [Member] | Third parties [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Name of Shareholders Third parties            
% Ownership 87.50%            
Outside Italy [Member] | Subsidiaries Nine [Member] | Eni Deutsch GmbH [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Name of Shareholders Eni Deutsch.GmbH            
% Ownership 12.50%            
Outside Italy [Member] | Subsidiaries Ten [Member]              
Disclosure of subsidiaries [line items]              
Share capital | SFr         SFr 3,259,500    
Outside Italy [Member] | Subsidiaries Ten [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Company name TAR - Tankanlage Ruemlang AG            
Registered office Ruemlang  (Switzerland)            
Country of operation Switzerland            
Consolidation or valutation method [1] F.V.            
Outside Italy [Member] | Subsidiaries Ten [Member] | Third parties [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Name of Shareholders Third parties            
% Ownership 83.73%            
Outside Italy [Member] | Subsidiaries Ten [Member] | Eni Suisse SA [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Name of Shareholders Eni Suisse SA            
% Ownership 16.27%            
Outside Italy [Member] | Subsidiaries Eleven [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Registered office Accra  (Ghana)            
Country of operation Ghana            
Share capital | GH₵           GH₵ 258,309  
Outside Italy [Member] | Subsidiaries Eleven [Member] | Third parties [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Name of Shareholders Third parties            
% Ownership 88.00%            
Outside Italy [Member] | Subsidiaries Eleven [Member] | Eni International BV [Member] | Italy [Member]              
Disclosure of subsidiaries [line items]              
Name of Shareholders Eni International BV            
% Ownership 12.00%            
[1] F.C. = full consolidation, J.O. = joint operation, Eq. = equity-accounted, Co. = valued at cost, F.V. = valued at fair value
[2] ​The item related to the increase in provisions for contingencies that are shown at present value in non-current liabilities.
[3] Shares without nominal value.