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Other information about investments (Details 14)
 12 Months Ended
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
GBP (£)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
GHS (GH₵)
Dec. 31, 2017
CHF (SFr)
Dec. 31, 2016
EUR (€)
Disclosure of subsidiaries [line items]            
Share capital € 4,005,000,000         € 4,005,000,000
Italy [Member] | Italy [Member] | Subsidiaries One [Member]            
Disclosure of subsidiaries [line items]            
Company name Consorzio Nazionale per la Gestione Raccolta e Trattamento degli Oli Minerali Usati (former Consorzio Obbligatorio degli Oli Usati)          
Registered office Rome          
Country of operation Italy          
Share capital € 36,149          
Method used to account for investments in subsidiaries [1] Co.          
Italy [Member] | Italy [Member] | Subsidiaries One [Member] | Eni SpA [Member]            
Disclosure of subsidiaries [line items]            
Name of Shareholders Eni SpA          
% Ownership 12.43%          
Italy [Member] | Italy [Member] | Subsidiaries One [Member] | Third parties [Member]            
Disclosure of subsidiaries [line items]            
Name of Shareholders Third parties          
% Ownership 87.57%          
Italy [Member] | Italy [Member] | Subsidiaries Two [Member]            
Disclosure of subsidiaries [line items]            
Company name [2] Società Italiana Oleodotti di Gaeta SpA          
Registered office Rome          
Country of operation Italy          
Share capital € 360,000,000          
Method used to account for investments in subsidiaries [1] Co.          
Italy [Member] | Italy [Member] | Subsidiaries Two [Member] | Eni SpA [Member]            
Disclosure of subsidiaries [line items]            
Name of Shareholders Eni SpA          
% Ownership 72.48%          
Italy [Member] | Italy [Member] | Subsidiaries Two [Member] | Third parties [Member]            
Disclosure of subsidiaries [line items]            
Name of Shareholders Third parties          
% Ownership 27.52%          
Outside Italy [Member] | Italy [Member] | Subsidiaries One [Member]            
Disclosure of subsidiaries [line items]            
Company name BFS Berlin Fuelling Services GbR          
Registered office Hamburg (Germany)          
Country of operation Germany          
Share capital € 91,139          
Method used to account for investments in subsidiaries [1] Co.          
Outside Italy [Member] | Italy [Member] | Subsidiaries One [Member] | Third parties [Member]            
Disclosure of subsidiaries [line items]            
Name of Shareholders Third parties          
% Ownership 87.50%          
Outside Italy [Member] | Italy [Member] | Subsidiaries One [Member] | Eni Deutsch.GmbH [Member]            
Disclosure of subsidiaries [line items]            
Name of Shareholders Eni Deutsch.GmbH          
% Ownership 12.50%          
Outside Italy [Member] | Italy [Member] | Subsidiaries Two [Member]            
Disclosure of subsidiaries [line items]            
Company name Compania de Economia Mixta ‘Austrogas’          
Registered office Cuenca (Ecuador)          
Country of operation Ecuador          
Share capital | $     $ 3,028,749      
Method used to account for investments in subsidiaries [1] Co.          
Outside Italy [Member] | Italy [Member] | Subsidiaries Two [Member] | Third parties [Member]            
Disclosure of subsidiaries [line items]            
Name of Shareholders Third parties          
% Ownership 86.69%          
Outside Italy [Member] | Italy [Member] | Subsidiaries Two [Member] | Eni Ecuador SA [Member]            
Disclosure of subsidiaries [line items]            
Name of Shareholders Eni Ecuador SA          
% Ownership 13.31%          
Outside Italy [Member] | Italy [Member] | Subsidiaries Three [Member]            
Disclosure of subsidiaries [line items]            
Company name Dépôt Pétrolier de Fos SA          
Registered office Fos-Sur-Mer (France)          
Country of operation France          
Share capital € 3,954,196          
Method used to account for investments in subsidiaries [1] Co.          
Outside Italy [Member] | Italy [Member] | Subsidiaries Three [Member] | Third parties [Member]            
Disclosure of subsidiaries [line items]            
Name of Shareholders Third parties          
% Ownership 83.19%          
Outside Italy [Member] | Italy [Member] | Subsidiaries Three [Member] | Eni France Sarl [Member]            
Disclosure of subsidiaries [line items]            
Name of Shareholders Eni France Sàrl          
% Ownership 16.81%          
Outside Italy [Member] | Italy [Member] | Subsidiaries Four [Member]            
Disclosure of subsidiaries [line items]            
Company name Dépôt Pétrolier de la Côte d’Azur SAS          
Registered office Nanterre (France)          
Country of operation France          
Share capital € 207,500          
Method used to account for investments in subsidiaries [1] Co.          
Outside Italy [Member] | Italy [Member] | Subsidiaries Four [Member] | Third parties [Member]            
Disclosure of subsidiaries [line items]            
Name of Shareholders Third parties          
% Ownership 82.00%          
Outside Italy [Member] | Italy [Member] | Subsidiaries Four [Member] | Eni France Sarl [Member]            
Disclosure of subsidiaries [line items]            
Name of Shareholders Eni France Sàrl          
% Ownership 18.00%          
Outside Italy [Member] | Italy [Member] | Subsidiaries Five [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        
Method used to account for investments in subsidiaries [1] Co.          
Outside Italy [Member] | Italy [Member] | Subsidiaries Five [Member] | Eni SpA [Member]            
Disclosure of subsidiaries [line items]            
Name of Shareholders Eni SpA          
% Ownership 12.50%          
Outside Italy [Member] | Italy [Member] | Subsidiaries Five [Member] | Third parties [Member]            
Disclosure of subsidiaries [line items]            
Name of Shareholders Third parties          
% Ownership 87.50%          
Outside Italy [Member] | Italy [Member] | Subsidiaries Six [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          
Share capital € 40,000          
Method used to account for investments in subsidiaries [1] Co.          
Outside Italy [Member] | Italy [Member] | Subsidiaries Six [Member] | Third parties [Member]            
Disclosure of subsidiaries [line items]            
Name of Shareholders Third parties          
% Ownership 87.50%          
Outside Italy [Member] | Italy [Member] | Subsidiaries Six [Member] | Eni France Sarl [Member]            
Disclosure of subsidiaries [line items]            
Name of Shareholders Eni France Sàrl          
% Ownership 12.50%          
Outside Italy [Member] | Italy [Member] | Subsidiaries Seven [Member]            
Disclosure of subsidiaries [line items]            
Company name Sistema Integrado de Gestion de Aceites Usados          
Registered office Madrid (Spain)          
Country of operation Spain          
Share capital € 175,713          
Method used to account for investments in subsidiaries [1] Co.          
Outside Italy [Member] | Italy [Member] | Subsidiaries Seven [Member] | Third parties [Member]            
Disclosure of subsidiaries [line items]            
Name of Shareholders Third parties          
% Ownership 84.56%          
Outside Italy [Member] | Italy [Member] | Subsidiaries Seven [Member] | Eni Iberia SLU [Member]            
Disclosure of subsidiaries [line items]            
Name of Shareholders Eni Iberia SLU          
% Ownership 15.44%          
Outside Italy [Member] | Italy [Member] | Subsidiaries Eight [Member]            
Disclosure of subsidiaries [line items]            
Company name Tanklager - Gesellschaft Tegel (TGT) GbR          
Registered office Hamburg (Germany)          
Country of operation Germany          
Share capital € 8,898          
Method used to account for investments in subsidiaries [1] Co.          
Outside Italy [Member] | Italy [Member] | Subsidiaries Eight [Member] | Third parties [Member]            
Disclosure of subsidiaries [line items]            
Name of Shareholders Third parties          
% Ownership 87.50%          
Outside Italy [Member] | Italy [Member] | Subsidiaries Eight [Member] | Eni Deutsch.GmbH [Member]            
Disclosure of subsidiaries [line items]            
Name of Shareholders Eni Deutsch.GmbH          
% Ownership 12.50%          
Outside Italy [Member] | Italy [Member] | Subsidiaries Nine [Member]            
Disclosure of subsidiaries [line items]            
Company name TAR - Tankanlage Ruemlang AG          
Registered office Ruemlang (Switzerland)          
Country of operation Switzerland          
Share capital | SFr         SFr 3,259,500  
Method used to account for investments in subsidiaries [1] Co.          
Outside Italy [Member] | Italy [Member] | Subsidiaries Nine [Member] | Third parties [Member]            
Disclosure of subsidiaries [line items]            
Name of Shareholders Third parties          
% Ownership 83.73%          
Outside Italy [Member] | Italy [Member] | Subsidiaries Nine [Member] | Eni Suisse SA [Member]            
Disclosure of subsidiaries [line items]            
Name of Shareholders Eni Suisse SA          
% Ownership 16.27%          
Outside Italy [Member] | Italy [Member] | Subsidiaries Ten [Member]            
Disclosure of subsidiaries [line items]            
Company name Tema Lube Oil Co Ltd          
Registered office Accra (Ghana)          
Country of operation Ghana          
Share capital | GH₵       GH₵ 258,309    
Method used to account for investments in subsidiaries [1] Co.          
Outside Italy [Member] | Italy [Member] | Subsidiaries Ten [Member] | Third parties [Member]            
Disclosure of subsidiaries [line items]            
Name of Shareholders Third parties          
% Ownership 88.00%          
Outside Italy [Member] | Italy [Member] | Subsidiaries Ten [Member] | Eni International BV [Member]            
Disclosure of subsidiaries [line items]            
Name of Shareholders Eni International BV          
% Ownership 12.00%          
[1] Jointly controlled entity.
[2] Company under extraordinary administration procedure pursuant to law no. 95 of april 3, 1979. The liquidation was concluded on april 28, 2015. The cancellation has been filed and is pending the authorization by the Ministry of Economic Development.
[3] Shares without nominal value.