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Other information about investments (Details 6)
 12 Months Ended
Dec. 31, 2018
EUR (€)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CHF (SFr)
Dec. 31, 2018
EGP (ج.م.)
Dec. 31, 2018
VEF ( )
Dec. 31, 2018
TND (د.ت)
Dec. 31, 2018
SGD ($)
Dec. 31, 2017
EUR (€)
Disclosure of subsidiaries [line items]                
Share capital € 4,005,000,000             € 4,005,000,000
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries One [Member]                
Disclosure of subsidiaries [line items]                
Company name [1] Arezzo Gas 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] Eq.              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries One [Member] | Eni Fuel SpA [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Eni Fuel SpA              
% Ownership 50.00%              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries One [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Third parties              
% Ownership 50.00%              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries One [Member] | ENI SPA [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Eni SpA              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries One [Member] | Arezzo Gas SpA [Member]                
Disclosure of subsidiaries [line items]                
Registered office Arezzo              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Two [Member]                
Disclosure of subsidiaries [line items]                
Company name CePIM Centro Padano Interscambio Merci 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] Eq.              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Two [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Third parties              
% Ownership 55.22%              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Two [Member] | Ecofuel SpA [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Ecofuel SpA              
% Ownership 44.78%              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Two [Member] | ENI SPA [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Eni SpA              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Two [Member] | CePIM Centro Padano Interscambio Merci SpA [Member]                
Disclosure of subsidiaries [line items]                
Registered office Fontevivo (PR)              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Three [Member]                
Disclosure of subsidiaries [line items]                
Company name Consorzio Operatori GPL di Napoli              
Registered office Gela (CL)              
Country of operation Italy              
Share capital € 15,000,000 102,000            
% Equity ratio 100.00%              
Consolidation or valutation method [1] Co.              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Three [Member] | Eni Fuel SpA [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Eni Fuel SpA              
% Ownership 25.00%              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Three [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Third parties              
% Ownership 75.00%              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Three [Member] | ENI SPA [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Eni SpA              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Three [Member] | Consorzio Operatori GPL di Napoli [Member]                
Disclosure of subsidiaries [line items]                
Registered office Napoli              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Four [Member]                
Disclosure of subsidiaries [line items]                
Company name [1] Costiero Gas Livorno SpA              
Registered office Genova              
Country of operation Italy              
Share capital € 12,400,000 26,000,000            
% Equity ratio 65.00%              
Consolidation or valutation method [1] J.O.              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Four [Member] | Eni Fuel SpA [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Eni Fuel SpA              
% Ownership 65.00%              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Four [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Third parties              
% Ownership 35.00%              
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 Four [Member] | Costiero Gas Liv SpA [Member]                
Disclosure of subsidiaries [line items]                
Registered office Livorno              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Five [Member]                
Disclosure of subsidiaries [line items]                
Company name Disma SpA              
Registered office Rome              
Country of operation Italy              
Share capital € 13,580,000.20 2,600,000            
Consolidation or valutation method [1] Eq.              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Five [Member] | Eni Fuel SpA [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Eni Fuel SpA              
% Ownership 25.00%              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Five [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Third parties              
% Ownership 75.00%              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Five [Member] | ENI SPA [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Eni SpA              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Five [Member] | Disma SpA [Member]                
Disclosure of subsidiaries [line items]                
Registered office Segrate (MI)              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Six [Member]                
Disclosure of subsidiaries [line items]                
Company name Livorno LNG Terminal SpA              
Registered office Livorno              
Country of operation Italy              
Share capital | $   200,000            
Consolidation or valutation method [1] Eq.              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Six [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Third parties              
% Ownership 50.00%              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Six [Member] | Costiero Gas Liv SpA [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Costiero Gas Liv. SpA              
% Ownership 50.00%              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Seven [Member]                
Disclosure of subsidiaries [line items]                
Company name [1] Petroven Srl              
Registered office Genova              
Country of operation Italy              
Share capital | $   156,000            
% Equity ratio 68.00%              
Consolidation or valutation method [1] J.O.              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Seven [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Third parties              
% Ownership 32.00%              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Seven [Member] | Ecofuel SpA [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Ecofuel SpA              
% Ownership 68.00%              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eight [Member]                
Disclosure of subsidiaries [line items]                
Company name Porto Petroli di Genova SpA              
Registered office Genova              
Country of operation Italy              
Share capital | $   2,068,000            
Consolidation or valutation method [1] Eq.              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eight [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Third parties              
% Ownership 59.50%              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eight [Member] | Ecofuel SpA [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Ecofuel SpA              
% Ownership 40.50%              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Nine [Member]                
Disclosure of subsidiaries [line items]                
Company name [1] Raffineria di Milazzo ScpA              
Registered office Milazzo (ME)              
Country of operation Italy              
Share capital | $   171,143,000            
% Equity ratio 50.00%              
Consolidation or valutation method [1] J.O.              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Nine [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Third parties              
% Ownership 50.00%              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Nine [Member] | ENI SPA [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Eni SpA              
% Ownership 50.00%              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Ten [Member]                
Disclosure of subsidiaries [line items]                
Company name Seram SpA              
Registered office Fiumicino (RM)              
Country of operation Italy              
Share capital | $   852,000            
Consolidation or valutation method [1] Co.              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Ten [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Third parties              
% Ownership 75.00%              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Ten [Member] | ENI SPA [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Eni SpA              
% Ownership 25.00%              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eleven [Member]                
Disclosure of subsidiaries [line items]                
Company name Sigea Sistema Integrato Genova Arquata SpA              
Registered office Genova              
Country of operation Italy              
Share capital | $   3,326,900            
Consolidation or valutation method [1] Eq.              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eleven [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Third parties              
% Ownership 65.00%              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eleven [Member] | Ecofuel SpA [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Ecofuel SpA              
% Ownership 35.00%              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Twelve [Member]                
Disclosure of subsidiaries [line items]                
Company name [1] Societa Italiana Oleodotti di Gaeta SpA              
Registered office San Donato Milanese (MI)              
Country of operation Italy              
Share capital | $   3,085,000            
% Equity ratio 70.00%              
Consolidation or valutation method [1] J.O.              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Twelve [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Third parties              
% Ownership 30.00%              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Twelve [Member] | ENI SPA [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Eni SpA              
% Ownership 70.00%              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Thirteen [Member]                
Disclosure of subsidiaries [line items]                
Company name [1] Termica Milazzo Srl              
Registered office Milazzo (ME)              
Country of operation Italy              
Share capital | $   100,000            
% Equity ratio 50.00%              
Consolidation or valutation method [1] J.O.              
In Italy [Member] | Refining And Marketing [Member] | Subsidiaries Thirteen [Member] | Raff Milazzo ScpA [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Raff. Milazzo ScpA              
% Ownership 100.00%              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries One [Member]                
Disclosure of subsidiaries [line items]                
Company name [1] AET - Raffineriebeteiligungs gesellschaft mbH              
Registered office Schwedt  (Germany)              
Country of operation Germany              
Share capital € 27,000              
Consolidation or valutation method [1] Eq.              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries One [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Third parties              
% Ownership 66.67%              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries One [Member] | Eni Deutsch GmbH [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Eni Deutsch.GmbH              
% Ownership 33.33%              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Two [Member]                
Disclosure of subsidiaries [line items]                
Company name [1] Bayernoil Raffineriegesellschaft mbH              
Registered office Vohburg  (Germany)              
Country of operation Germany              
Share capital € 10,226,000              
% Equity ratio 20.00%              
Consolidation or valutation method [1] J.O.              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Two [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Third parties              
% Ownership 80.00%              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Two [Member] | Eni Deutsch GmbH [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Eni Deutsch.GmbH              
% Ownership 20.00%              
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]                
Company name [1] City Carburoil SA              
Registered office Rivera  (Switzerland)              
Country of operation Switzerland              
Share capital | SFr     SFr 6,000,000          
Consolidation or valutation method [1] Eq.              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Three [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Third parties              
% Ownership 50.09%              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Three [Member] | Eni Suisse SA [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Eni Suisse SA              
% Ownership 49.91%              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Four [Member]                
Disclosure of subsidiaries [line items]                
Company name Egyptian International Gas Technology Co              
Registered office Cairo  (Egypt)              
Country of operation Egypt              
Share capital | ج.م.       ج.م. 100,000,000        
Consolidation or valutation method [1] Co.              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Four [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Third parties              
% Ownership 60.00%              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Four [Member] | Eni International BV [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Eni International BV              
% Ownership 40.00%              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Five [Member]                
Disclosure of subsidiaries [line items]                
Company name ENEOS Italsing Pte Ltd              
Registered office Singapore  (Singapore)              
Country of operation Singapore              
Share capital | $             $ 12,000,000  
Consolidation or valutation method [1] Eq.              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Five [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Third parties              
% Ownership 77.50%              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Five [Member] | Eni International BV [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Eni International BV              
% Ownership 22.50%              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Six [Member]                
Disclosure of subsidiaries [line items]                
Company name FSH Flughafen Schwechat Hydranten- Gesellschaft OG              
Registered office Amsterdam  (Netherlands)              
Country of operation Austria              
Share capital € 20,000              
Consolidation or valutation method [1] Co.              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Six [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Third parties              
% Ownership 56.32%              
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 Market A GmbH [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Eni Market.A.GmbH              
% Ownership 14.56%              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Six [Member] | Eni Mineralolh GmbH [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Eni Mineralölh.GmbH              
% Ownership 14.56%              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Six [Member] | Eni Austria GmbH [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Eni Austria GmbH              
% Ownership 14.56%              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Six [Member] | FSH Flughafen Schwechat Hydranten Gsellschaft OG [Member]                
Disclosure of subsidiaries [line items]                
Registered office Wien  (Austria)              
Share capital € 7,798,020.99              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Seven [Member]                
Disclosure of subsidiaries [line items]                
Company name Fuelling Aviation Services GIE              
Registered office Wien  (Austria)              
Country of operation France              
Share capital € 78,500,000              
% Equity ratio 100.00%              
Consolidation or valutation method [1] Co.              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Seven [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Third parties              
% Ownership 75.00%              
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 France Sarl [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Eni France Sàrl              
% Ownership 25.00%              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Seven [Member] | Fuelling Aviation Services GIE [Member]                
Disclosure of subsidiaries [line items]                
Registered office Tremblay en France  (France)              
Share capital € 1              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eight [Member]                
Disclosure of subsidiaries [line items]                
Company name Mediterranee Bitumes SA              
Registered office Rotterdam  (Netherlands)              
Country of operation Tunisia              
Share capital € 1,934,040         د.ت 1,000,000    
% Equity ratio 100.00%              
Consolidation or valutation method [1] Eq.              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eight [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Third parties              
% Ownership 66.00%              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eight [Member] | Eni International BV [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Eni International BV              
% Ownership 34.00%              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eight [Member] | Mediterranee Bitumes SA [Member]                
Disclosure of subsidiaries [line items]                
Registered office Tunisi  (Tunisia)              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Nine [Member]                
Disclosure of subsidiaries [line items]                
Company name Routex BV              
Country of operation Netherlands              
Share capital € 90,000,000              
% Equity ratio 100.00%              
Consolidation or valutation method [1] Eq.              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Nine [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Third parties              
% Ownership 80.00%              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Nine [Member] | Eni International BV [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Eni International BV              
% Ownership 20.00%              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Nine [Member] | Eni Mineralolh GmbH [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Eni Mineralölh.GmbH              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Nine [Member] | Routex BV [Member]                
Disclosure of subsidiaries [line items]                
Registered office Amsterdam  (Netherlands)              
Share capital € 67,500              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Ten [Member]                
Disclosure of subsidiaries [line items]                
Company name Saraco SA              
Registered office Quito  (Ecuador)              
Country of operation Switzerland              
Share capital   $ 103,142.08 SFr 420,000          
% Equity ratio 100.00%              
Consolidation or valutation method [1] Co.              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Ten [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Third parties              
% Ownership 80.00%              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Ten [Member] | Eni Suisse SA [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Eni Suisse SA              
% Ownership 20.00%              
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] | Saraco SA [Member]                
Disclosure of subsidiaries [line items]                
Registered office Meyrin  (Switzerland)              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eleven [Member]                
Disclosure of subsidiaries [line items]                
Company name [1] Supermetanol CA              
Registered office Lyon  (France)              
Country of operation Venezuela              
Share capital € 56,800,000       120,867      
% Equity ratio 100.00%              
Consolidation or valutation method [1] J.O.              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eleven [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Third parties              
% Ownership 35.42%              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Eleven [Member] | Ecofuel SpA [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Ecofuel SpA              
% Ownership [2] 34.51%              
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] | Supermetanol CA [Member]                
Disclosure of subsidiaries [line items]                
Registered office Jose Puerto La Cruz  (Venezuela)              
Shareholders Supermetanol CA              
% Ownership 30.07%              
% Equity ratio 50.00%              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Twelve [Member]                
Disclosure of subsidiaries [line items]                
Company name [1] TBG Tanklager Betriebsgesellschaft GmbH              
Registered office Alcobendas  (Spain)              
Country of operation Austria              
Share capital € 17,299,100              
% Equity ratio 100.00%              
Consolidation or valutation method [1] Eq.              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Twelve [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Third parties              
% Ownership 50.00%              
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 Twelve [Member] | Eni Market A GmbH [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Eni Market.A.GmbH              
% Ownership 50.00%              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Twelve [Member] | TBG Tanklager [Member]                
Disclosure of subsidiaries [line items]                
Registered office Salzburg  (Austria)              
Share capital € 43,603.70              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Thirteen [Member]                
Disclosure of subsidiaries [line items]                
Company name Weat Electronic Datenservice GmbH              
Registered office Shanghai  (China)              
Country of operation Germany              
Share capital € 409,034              
% Equity ratio 100.00%              
Consolidation or valutation method [1] Eq.              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Thirteen [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Third parties              
% Ownership 80.00%              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Thirteen [Member] | Eni Deutsch GmbH [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Eni Deutsch.GmbH              
% Ownership 20.00%              
Outside Italy [Member] | Refining And Marketing [Member] | Subsidiaries Thirteen [Member] | Eni International BV [Member]                
Disclosure of subsidiaries [line items]                
Shareholders Eni International BV              
[1] F.C. = full consolidation, J.O. = joint operation, Eq. = equity-accounted, Co. = valued at cost, F.V. = valued at fair value
[2] Controlling interest: