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Other information about investments (Details 9)
 12 Months Ended
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
EGP (ج.م.)
Dec. 31, 2017
TND (د.ت)
Dec. 31, 2017
CHF (SFr)
Dec. 31, 2017
SGD ($)
Dec. 31, 2017
VEF ( )
Dec. 31, 2016
EUR (€)
Disclosure of subsidiaries [line items]              
Share capital € 4,005,000,000           € 4,005,000,000
Italy [Member] | Refining & Marketing [Member] | Subsidiaries One [Member]              
Disclosure of subsidiaries [line items]              
Company name [1] Arezzo Gas SpA(†)            
Registered office Arezzo            
Country of operation Italy            
Share capital € 394,000            
Consolidation or valutation method [1] Eq.            
Italy [Member] | Refining & Marketing [Member] | Subsidiaries One [Member] | Eni Fuel SpA [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Eni Fuel SpA            
% Ownership 50.00%            
Italy [Member] | Refining & Marketing [Member] | Subsidiaries One [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Third parties            
% Ownership 50.00%            
Italy [Member] | Refining & Marketing [Member] | Subsidiaries Two [Member]              
Disclosure of subsidiaries [line items]              
Company name CePIM Centro Padano Interscambio Merci SpA            
Registered office Fontevivo (PR)            
Country of operation Italy            
Share capital € 6,642,928.32            
Consolidation or valutation method [1] Eq.            
Italy [Member] | Refining & Marketing [Member] | Subsidiaries Two [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Third parties            
% Ownership 65.07%            
Italy [Member] | Refining & Marketing [Member] | Subsidiaries Two [Member] | Ecofuel SpA [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Ecofuel SpA            
% Ownership 34.93%            
Italy [Member] | Refining & Marketing [Member] | Subsidiaries Three [Member]              
Disclosure of subsidiaries [line items]              
Company name Consorzio Operatori GPL di Napoli            
Registered office Napoli            
Country of operation Italy            
Share capital € 102,000            
Consolidation or valutation method [1] Co.            
Italy [Member] | Refining & Marketing [Member] | Subsidiaries Three [Member] | Eni Fuel SpA [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Eni Fuel SpA            
% Ownership 25.00%            
Italy [Member] | Refining & Marketing [Member] | Subsidiaries Three [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Third parties            
% Ownership 75.00%            
Italy [Member] | Refining & Marketing [Member] | Subsidiaries Four [Member]              
Disclosure of subsidiaries [line items]              
Company name [1] Costiero Gas Livorno SpA(†)            
Registered office Livorno            
Country of operation Italy            
Share capital € 26,000,000            
% Equity ratio 65.00%            
Consolidation or valutation method [1] J.O.            
Italy [Member] | Refining & Marketing [Member] | Subsidiaries Four [Member] | Eni Fuel SpA [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Eni Fuel SpA            
% Ownership 65.00%            
Italy [Member] | Refining & Marketing [Member] | Subsidiaries Four [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Third parties            
% Ownership 35.00%            
Italy [Member] | Refining & Marketing [Member] | Subsidiaries Five [Member]              
Disclosure of subsidiaries [line items]              
Company name Disma SpA            
Registered office Segrate (MI)            
Country of operation Italy            
Share capital € 2,600,000            
Consolidation or valutation method [1] Eq.            
Italy [Member] | Refining & Marketing [Member] | Subsidiaries Five [Member] | Eni Fuel SpA [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Eni Fuel SpA            
% Ownership 25.00%            
Italy [Member] | Refining & Marketing [Member] | Subsidiaries Five [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Third parties            
% Ownership 75.00%            
Italy [Member] | Refining & Marketing [Member] | Subsidiaries Six [Member]              
Disclosure of subsidiaries [line items]              
Company name [1] PETRA SpA(†)            
Registered office Ravenna            
Country of operation Italy            
Share capital € 723,100            
Consolidation or valutation method [1] Eq.            
Italy [Member] | Refining & Marketing [Member] | Subsidiaries Six [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Third parties            
% Ownership 50.00%            
Italy [Member] | Refining & Marketing [Member] | Subsidiaries Six [Member] | Ecofuel SpA [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Ecofuel SpA            
% Ownership 50.00%            
Italy [Member] | Refining & 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.            
Italy [Member] | Refining & Marketing [Member] | Subsidiaries Seven [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Third parties            
% Ownership 32.00%            
Italy [Member] | Refining & Marketing [Member] | Subsidiaries Seven [Member] | Ecofuel SpA [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Ecofuel SpA            
% Ownership 68.00%            
Italy [Member] | Refining & 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.            
Italy [Member] | Refining & Marketing [Member] | Subsidiaries Eight [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Third parties            
% Ownership 59.50%            
Italy [Member] | Refining & Marketing [Member] | Subsidiaries Eight [Member] | Ecofuel SpA [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Ecofuel SpA            
% Ownership 40.50%            
Italy [Member] | Refining & 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.            
Italy [Member] | Refining & Marketing [Member] | Subsidiaries Nine [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Third parties            
% Ownership 50.00%            
Italy [Member] | Refining & Marketing [Member] | Subsidiaries Nine [Member] | Eni SpA [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Eni SpA            
% Ownership 50.00%            
Italy [Member] | Refining & Marketing [Member] | Subsidiaries Ten [Member]              
Disclosure of subsidiaries [line items]              
Company name [1] SeaPad SpA(†)            
Registered office Genova            
Country of operation Italy            
Share capital € 12,400,000            
Consolidation or valutation method [1] Eq.            
Italy [Member] | Refining & Marketing [Member] | Subsidiaries Ten [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Third parties            
% Ownership 20.00%            
Italy [Member] | Refining & Marketing [Member] | Subsidiaries Ten [Member] | Ecofuel SpA [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Ecofuel SpA            
% Ownership 80.00%            
Italy [Member] | Refining & Marketing [Member] | Subsidiaries Eleven [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.            
Italy [Member] | Refining & Marketing [Member] | Subsidiaries Eleven [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Third parties            
% Ownership 75.00%            
Italy [Member] | Refining & Marketing [Member] | Subsidiaries Eleven [Member] | Eni SpA [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Eni SpA            
% Ownership 25.00%            
Italy [Member] | Refining & Marketing [Member] | Subsidiaries Twelve [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.            
Italy [Member] | Refining & Marketing [Member] | Subsidiaries Twelve [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Third parties            
% Ownership 65.00%            
Italy [Member] | Refining & Marketing [Member] | Subsidiaries Twelve [Member] | Ecofuel SpA [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Ecofuel SpA            
% Ownership 35.00%            
Italy [Member] | Refining & 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            
Shareholders Raff. Milazzo ScpA            
% Ownership 100.00%            
% Equity ratio 50.00%            
Consolidation or valutation method [1] J.O.            
Outside Italy [Member] | Refining & 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 & Marketing [Member] | Subsidiaries One [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Third parties            
% Ownership 66.67%            
Outside Italy [Member] | Refining & 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 & 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 & Marketing [Member] | Subsidiaries Two [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Third parties            
% Ownership 80.00%            
Outside Italy [Member] | Refining & 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 & 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 & Marketing [Member] | Subsidiaries Three [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Third parties            
% Ownership 50.09%            
Outside Italy [Member] | Refining & 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 & 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 & Marketing [Member] | Subsidiaries Four [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Third parties            
% Ownership 60.00%            
Outside Italy [Member] | Refining & 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 & 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 & Marketing [Member] | Subsidiaries Five [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Third parties            
% Ownership 77.50%            
Outside Italy [Member] | Refining & 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 & Marketing [Member] | Subsidiaries Six [Member]              
Disclosure of subsidiaries [line items]              
Company name FSH Flughafen Schwechat Hydranten-Gesellschaft OG            
Registered office Wien (Austria)            
Country of operation Austria            
Share capital € 7,798,020.99            
Consolidation or valutation method [1] Co.            
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Six [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Third parties            
% Ownership 56.32%            
Outside Italy [Member] | Refining & 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 & 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 & 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 & Marketing [Member] | Subsidiaries Seven [Member]              
Disclosure of subsidiaries [line items]              
Company name Fuelling Aviation Services GIE            
Registered office Tremblay en France (France)            
Country of operation France            
Share capital € 1            
Consolidation or valutation method [1] Co.            
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Seven [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Third parties            
% Ownership 75.00%            
Outside Italy [Member] | Refining & 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 & Marketing [Member] | Subsidiaries Eight [Member]              
Disclosure of subsidiaries [line items]              
Company name Mediterranée Bitumes SA            
Registered office Tunisi (Tunisia)            
Country of operation Tunisia            
Share capital | د.ت     د.ت 1,000,000        
Consolidation or valutation method [1] Eq.            
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Eight [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Third parties            
% Ownership 66.00%            
Outside Italy [Member] | Refining & 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 & Marketing [Member] | Subsidiaries Nine [Member]              
Disclosure of subsidiaries [line items]              
Company name Routex BV            
Registered office Amsterdam (Netherlands)            
Country of operation Netherlands            
Share capital € 67,500            
Consolidation or valutation method [1] Eq.            
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Nine [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Third parties            
% Ownership 80.00%            
Outside Italy [Member] | Refining & 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 & Marketing [Member] | Subsidiaries Ten [Member]              
Disclosure of subsidiaries [line items]              
Company name Saraco SA            
Registered office Meyrin (Switzerland)            
Country of operation Switzerland            
Share capital | SFr       SFr 420,000      
Consolidation or valutation method [1] Co.            
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Ten [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Third parties            
% Ownership 80.00%            
Outside Italy [Member] | Refining & 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 & Marketing [Member] | Subsidiaries Eleven [Member]              
Disclosure of subsidiaries [line items]              
Company name [1] Supermetanol CA(†)            
Registered office Jose Puerto La Cruz (Venezuela)            
Country of operation Venezuela            
Share capital |           12,086,744.84  
% Equity ratio 50.00%            
Consolidation or valutation method [1] J.O.            
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Eleven [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Third parties            
% Ownership 35.42%            
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Eleven [Member] | Ecofuel SpA [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Ecofuel SpA            
% Ownership [2] 34.51%            
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Eleven [Member] | Supermetanol CA [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Supermetanol CA            
% Ownership 30.07%            
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Twelve [Member]              
Disclosure of subsidiaries [line items]              
Company name [1] TBG Tanklager Betriebsgesellschaft GmbH(†)            
Registered office Salzburg (Austria)            
Country of operation Austria            
Share capital € 43,603.7            
Consolidation or valutation method [1] Eq.            
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Twelve [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Third parties            
% Ownership 50.00%            
Outside Italy [Member] | Refining & 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 & Marketing [Member] | Subsidiaries Thirteen [Member]              
Disclosure of subsidiaries [line items]              
Company name Weat Electronic Datenservice GmbH            
Registered office Düsseldorf (Germany)            
Country of operation Germany            
Share capital € 409,034            
Consolidation or valutation method [1] Eq.            
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Thirteen [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Third parties            
% Ownership 80.00%            
Outside Italy [Member] | Refining & Marketing [Member] | Subsidiaries Thirteen [Member] | Eni Deutsch.GmbH [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Eni Deutsch.GmbH            
% Ownership 20.00%            
[1] Jointly controlled entity.
[2] Controlling interest: Ecofuel SpA 50.00 Third parties 50.00