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Other information about investments (Details 4)
 12 Months Ended
Dec. 31, 2018
EUR (€)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
GBP (£)
Dec. 31, 2018
EGP (ج.م.)
Dec. 31, 2018
VEF ( )
Dec. 31, 2018
KZT (₸)
Dec. 31, 2018
KWD (د.ك)
Dec. 31, 2018
MZN (MT)
Dec. 31, 2018
AED (د.إ)
Dec. 31, 2017
EUR (€)
Disclosure of detailed information about investment property [line items]                    
Share capital | € € 4,005,000,000                 € 4,005,000,000
In Italy [Member] | Exploration and Productions [Member] | Subsidiaries One [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name [1] Mozambique Rovuma Venture SpA (†)                  
Registered office San Donato  Milanese (MI)                  
Country of operation Mozambique                  
Share capital | € € 20,000,000                  
% Equity ratio 35.71%                  
Consolidation or valutation method [1] J.O.                  
In Italy [Member] | Exploration and Productions [Member] | Subsidiaries One [Member] | ENI SPA [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Eni SpA                  
% Ownership 35.71%                  
In Italy [Member] | Exploration and Productions [Member] | Subsidiaries One [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Third parties                  
% Ownership 64.29%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries One [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name [1] Agiba Petroleum Co (†)                  
Registered office Cairo  (Egypt)                  
Country of operation Egypt                  
Share capital | ج.م.       ج.م. 20,000            
Consolidation or valutation method [1] Co.                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries One [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Third partie                  
% Ownership 50.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries One [Member] | Ieoc Production BV [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Ieoc Production BV                  
% Ownership 50.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Two [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name Angola LNG Ltd                  
Registered office Hamilton  (Bermuda)                  
Country of operation Angola                  
Share capital   $ 10,082,000,000                
Consolidation or valutation method [1] Eq.                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Two [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Third parties                  
% Ownership 86.40%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Two [Member] | Eni Angola Prod BV [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Eni Angola Prod.BV                  
% Ownership 13.60%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Three [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name Ashrafi Island Petroleum Co                  
Registered office Cairo  (Egypt)                  
Country of operation Egypt                  
Share capital | ج.م.       20,000            
Consolidation or valutation method [1] Co.                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Three [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Third parties                  
% Ownership 75.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Three [Member] | Ieoc Production BV [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Ieoc Production BV                  
% Ownership 25.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Four [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name [1] Barentsmorneftegaz Sàrl(†)                  
Registered office Luxembourg  (Luxembourg)                  
Country of operation Russia                  
Share capital   20,000                
Consolidation or valutation method [1] Eq.                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Four [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Third parties                  
% Ownership 66.67%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Four [Member] | Eni Energy Russia BV [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Eni Energy Russia BV                  
% Ownership 33.33%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Five [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name [1] Cabo Delgado Gas Development Limitada(†)                  
Registered office Maputo  (Mozambique)                  
Country of operation Mozambique                  
Share capital | MT               MT 2,500,000    
Consolidation or valutation method [1] Co.                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Five [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Third parties                  
% Ownership 50.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Five [Member] | Eni MozamLNG HBV [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Eni Mozam.LNG H. BV                  
% Ownership 50.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Six [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name [1] Cardón IV SA(†)                  
Registered office Caracas  (Venezuela)                  
Country of operation Venezuela                  
Share capital |         172.1          
Consolidation or valutation method [1] Eq.                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Six [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Third parties                  
% Ownership 50.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Six [Member] | Eni Venezuela BV [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Eni Venezuela BV                  
% Ownership 50.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Seven [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name Compañia Agua Plana SA                  
Registered office Caracas  (Venezuela)                  
Country of operation Venezuela                  
Share capital |         0.001          
Consolidation or valutation method [1] Co.                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Seven [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Third parties                  
% Ownership 74.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Seven [Member] | Eni Venezuela BV [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Eni Venezuela BV                  
% Ownership 26.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Eight [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name Coral FLNG SA                  
Registered office Maputo  (Mozambique)                  
Country of operation Mozambique                  
Share capital | MT               MT 100,000,000    
Consolidation or valutation method [1] Eq.                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Eight [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Third parties                  
% Ownership 75.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Eight [Member] | Eni MozamLNG HBV [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Eni Mozam.LNG H. BV                  
% Ownership 25.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Nine [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name Coral South FLNG DMCC                  
Registered office Dubai (United Arab Emirates)                  
Country of operation United Arab  Emirates                  
Share capital | د.إ                 د.إ 500,000  
Consolidation or valutation method [1] Eq.                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Nine [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Third parties                  
% Ownership 75.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Nine [Member] | Eni MozamLNG HBV [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Eni Mozam.LNG H. BV                  
% Ownership 25.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Ten [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name East Delta Gas Co (in liquidation)                  
Registered office Cairo  (Egypt)                  
Country of operation Egypt                  
Share capital | ج.م.       20,000            
Consolidation or valutation method [1] Co.                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Ten [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Third parties                  
% Ownership 62.50%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Ten [Member] | Ieoc Production BV [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Ieoc Production BV                  
% Ownership 37.50%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Eleven [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name [1] East Kanayis Petroleum Co(†)                  
Registered office Cairo  (Egypt)                  
Country of operation Egypt                  
Share capital | ج.م.       20,000            
Consolidation or valutation method [1] Co.                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Eleven [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Third parties                  
% Ownership 50.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Eleven [Member] | Ieoc Production BV [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Ieoc Production BV                  
% Ownership 50.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twelve [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name [1] East Obaiyed Petroleum Company(†)                  
Registered office Cairo  (Egypt)                  
Country of operation Egypt                  
Share capital | ج.م.       20,000            
Consolidation or valutation method [1] Co.                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twelve [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Third parties                  
% Ownership 50.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twelve [Member] | Ieoc SpA [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Ieoc SpA                  
% Ownership 50.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirteen [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name El Temsah Petroleum Co                  
Registered office Cairo  (Egypt)                  
Country of operation Egypt                  
Share capital | ج.م.       20,000            
Consolidation or valutation method [1] Co.                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirteen [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Third parties                  
% Ownership 75.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirteen [Member] | Ieoc Production BV [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Ieoc Production BV                  
% Ownership 25.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Fourteen [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name [1] El-Fayrouz Petroleum Co(†) (in liquidation)                  
Registered office Cairo  (Egypt)                  
Country of operation Egypt                  
Share capital | ج.م.       ج.م. 20,000            
Consolidation or valutation method [1] Co.                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Fourteen [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Third parties                  
% Ownership 50.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Fourteen [Member] | Ieoc Exploration BV [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Ieoc Exploration BV                  
% Ownership 50.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Fifteen [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name [1] Fedynskmorneftegaz Sàrl(†)                  
Registered office Luxembourg  (Luxembourg)                  
Country of operation Russia                  
Share capital   20,000                
Consolidation or valutation method [1] Eq.                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Fifteen [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Third parties                  
% Ownership 66.67%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Fifteen [Member] | Eni Energy Russia BV [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Eni Energy Russia BV                  
% Ownership 33.33%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Sixteen [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name [1] Isatay Operating Company Llp(†)                  
Registered office Astana  (Kazakhstan)                  
Country of operation Kazakhstan                  
Share capital | ₸           ₸ 400,000        
Consolidation or valutation method [1] Co.                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Sixteen [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Third parties                  
% Ownership 50.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Sixteen [Member] | Eni Isatay BV [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Eni Isatay BV                  
% Ownership 50.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Seventeen [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name Karachaganak Petroleum Operating BV                  
Registered office Amsterdam  (Netherlands)                  
Country of operation Kazakhstan                  
Share capital | € € 20,000                  
Consolidation or valutation method [1] Co.                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Seventeen [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Third parties                  
% Ownership 70.75%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Seventeen [Member] | Agip KarachagBV [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Agip Karachag.BV                  
% Ownership 29.25%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Eighteen [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name Karachaganak Project Development Ltd (KPD)                  
Registered office Reading, Berkshire (United Kingdom)                  
Country of operation United  Kingdom                  
Share capital | £     £ 100              
Consolidation or valutation method [1] Eq.                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Eighteen [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Third parties                  
% Ownership 62.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Eighteen [Member] | Agip KarachagBV [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Agip Karachag.BV                  
% Ownership 38.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Nineteen [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name Khaleej Petroleum Co Wll                  
Registered office Safat  (Kuwait)                  
Country of operation Kuwait                  
Share capital | د.ك             د.ك 250,000      
Consolidation or valutation method [1] Eq.                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Nineteen [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Third parties                  
% Ownership 51.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Nineteen [Member] | Eni Middle E Ltd [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Eni Middle E. Ltd                  
% Ownership 49.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twenty [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name Liberty National Development Co Llc                  
Registered office Wilmington  (USA)                  
Country of operation USA                  
Share capital [2]   0                
Consolidation or valutation method [1] Eq.                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twenty [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Third parties                  
% Ownership 67.50%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twenty [Member] | Eni Oil & Gas Inc [Member]                    
Disclosure of detailed information about investment property [line items]                    
Shareholders Eni Oil & Gas Inc                  
% Ownership 32.50%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twenty One [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name Mediterranean Gas Co                  
Registered office Cairo  (Egypt)                  
Country of operation Egypt                  
Share capital   20,000                
Shareholders Ieoc Production BV  Third parties                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twenty One [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 75.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twenty One [Member] | Ieoc Production BV [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 25.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twenty Two [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name [1] Mellitah Oil & Gas BV(†)                  
Registered office Amsterdam  (Netherlands)                  
Country of operation Libya                  
Share capital   20,000                
Shareholders Eni North Africa BV  Third parties                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twenty Two [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 50.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twenty Two [Member] | Eni North Africa BV [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 50.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twenty Three [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name Nile Delta Oil Co Nidoco                  
Registered office Cairo  (Egypt)                  
Country of operation Egypt                  
Share capital   20,000                
Shareholders Ieoc Production BV  Third parties                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twenty Three [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 62.50%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twenty Three [Member] | Ieoc Production BV [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 37.50%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twenty Four [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name Norpipe Terminal Holdco Ltd                  
Registered office London (United Kingdom)                  
Country of operation Norway                  
Share capital   55.69                
Shareholders Eni SpA  Third parties                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twenty Four [Member] | ENI SPA [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 14.20%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twenty Four [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 85.80%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twenty Five [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name Norsea Pipeline Ltd                  
Registered office Woking Surrey (United Kingdom)                  
Country of operation Egypt                  
Share capital   20,000                
Shareholders Ieoc Exploration BV  Third parties                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twenty Five [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 70.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Twenty Five [Member] | Ieoc Exploration BV [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 30.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | SubsidiariesTwenty Six [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name North Bardawil Petroleum Co (in liquidation)                  
Registered office Cairo  (Egypt)                  
Country of operation Egypt                  
Share capital   20,000                
Shareholders Ieoc SpA  Third parties                  
Outside Italy [Member] | Exploration and Productions [Member] | SubsidiariesTwenty Six [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 75.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | SubsidiariesTwenty Six [Member] | Ieoc SpA [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 25.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | SubsidiariesTwenty Seven [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name North El Burg Petroleum Co                  
Registered office Cairo  (Egypt)                  
Country of operation Egypt                  
Share capital   20,000                
Shareholders Ieoc Production BV  Third parties                  
Outside Italy [Member] | Exploration and Productions [Member] | SubsidiariesTwenty Seven [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 50.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | SubsidiariesTwenty Seven [Member] | Ieoc Production BV [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 50.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | SubsidiariesTwenty Eight [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name [1] Petrobel Belayim Petroleum Co(†)                  
Registered office Caracas  (Venezuela)                  
Country of operation Venezuela                  
Share capital   3,790                
Shareholders Eni Lasmo Plc  Third parties                  
Outside Italy [Member] | Exploration and Productions [Member] | SubsidiariesTwenty Eight [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 60.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | SubsidiariesTwenty Eight [Member] | Eni Lasmo Plc [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 40.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | SubsidiariesTwenty Nine [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name [1] PetroBicentenario SA(†)                  
Registered office Caracas  (Venezuela)                  
Country of operation Venezuela                  
Share capital   24,021                
Shareholders Eni Lasmo Plc  Third parties                  
Outside Italy [Member] | Exploration and Productions [Member] | SubsidiariesTwenty Nine [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 60.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | SubsidiariesTwenty Nine [Member] | Eni Lasmo Plc [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 40.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name [1] PetroJunín SA(†)                  
Registered office Caracas  (Venezuela)                  
Country of operation Venezuela                  
Share capital   2,203                
Shareholders Eni Venezuela BV  Third parties                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 74.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty [Member] | Eni Venezuela BV [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 26.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty One [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name PetroSucre SA                  
Registered office Cairo  (Egypt)                  
Country of operation Egypt                  
Share capital   20,000                
Shareholders Ieoc Production BV  Third parties                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty One [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 75.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty One [Member] | Ieoc Production BV [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 25.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty Two [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name Pharaonic Petroleum Co                  
Registered office Sandnes  (Norway)                  
Country of operation Norway                  
Share capital   60,000                
Shareholders Vår Energi AS                  
% Ownership 100.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty Three [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name Point Resources FPSO Holding AS                  
Registered office Sandnes  (Norway)                  
Country of operation Norway                  
Share capital   150,100,000                
Shareholders PR FPSO Holding AS                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty Three [Member] | PR FPSO AS [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 100.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty Three [Member] | Holding As [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 5.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty Four [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name Point Resources FPSO Holding AS                  
Registered office Sandnes  (Norway)                  
Country of operation Norway                  
Share capital   0                
Shareholders PR FPSO AS  PR FPSO Holding AS                  
Outside Italy [Member] | Exploration and Productions [Member] | SubsidiariesThirty Five [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name PR Jotun DA                  
Registered office Cairo  (Egypt)                  
Country of operation Egypt                  
Share capital   20,000                
Shareholders Ieoc Production BV  Third parties                  
Outside Italy [Member] | Exploration and Productions [Member] | SubsidiariesThirty Five [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 50.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | SubsidiariesThirty Five [Member] | Ieoc Production BV [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 50.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty Six [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name [1] Port Said Petroleum Co(†)                  
Registered office Cairo  (Egypt)                  
Country of operation Egypt                  
Share capital   20,000                
Shareholders Ieoc Production BV  Third parties                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty Six [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 77.50%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty Six [Member] | Ieoc Production BV [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 22.50%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty Seven [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name Raml Petroleum Co                  
Registered office Cairo  (Egypt)                  
Country of operation Egypt                  
Share capital   20,000                
Shareholders Ieoc Production BV  Third parties                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty Seven [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 62.50%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty Seven [Member] | Ieoc Production BV [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 37.50%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty Eight [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name Ras Qattara Petroleum Co                  
Registered office Maputo  (Mozambique)                  
Country of operation Mozambique                  
Share capital   140,000                
Shareholders Mozamb. Rov. V. SpA  Third parties                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty Eight [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 66.67%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty Eight [Member] | Mozamb Rov V SpA [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 33.33%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty Nine [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name [1] Rovuma Basin LNG Land Limitada(†)                  
Registered office Cairo  (Egypt)                  
Country of operation Egypt                  
Share capital   20,000                
Shareholders Ieoc Production BV  Third parties                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty Nine [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 75.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Thirty Nine [Member] | Ieoc Production BV [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 25.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name Shorouk Petroleum Company                  
Registered office Pointe-Noire (Republic of theCongo)                  
Country of operation Republic of  the Congo                  
Share capital   44,732,000,000                
Shareholders Eni Congo SA  Third parties                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 80.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty [Member] | Eni Congo SA [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 20.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty One [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name Societe Centrale Electrique du Congo SA                  
Country of operation Tunisia                  
Share capital   5,000,000                
Shareholders Eni Tunisia BV  Third parties                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty One [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 50.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty One [Member] | Eni Tunisia BV [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 50.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Two [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name [1] Societe Italo Tunisienne d Exploitation Petroliere SA                  
Registered office Tunisi  (Tunisia)                  
Country of operation Tunisia                  
Share capital   100,000                
Shareholders Eni Tunisia BV  Third parties                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Two [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 50.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Two [Member] | Eni Tunisia BV [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 50.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Three [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name [1] Sodeps - Société de Developpement et d’Exploitation du Permis du Sud SA(†)                  
Registered office Istanbul  (Turkey)                  
Country of operation Turkey                  
Share capital   9,850,000                
Shareholders Eni International BV  Third parties                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Three [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 50.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Three [Member] | Eni International BV [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 50.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Four [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name Tapco Petrol Boru Hatti Sanayi ve Ticaret AS(†) (in liquidation)                  
Registered office Aksai  (Kazakhstan)                  
Country of operation Kazakhstan                  
Share capital   29,478,455                
Shareholders EniProgetti SpA  Third parties                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Four [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 51.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Four [Member] | Eni Progetti SpA [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 49.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Five [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name [1] Tecninco Engineering Contractors Llp(†)                  
Registered office Cairo  (Egypt)                  
Country of operation Egypt                  
Share capital   20,000                
Shareholders Ieoc Exploration BV  Third parties                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Five [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 75.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Five [Member] | Ieoc Exploration BV [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 25.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Six [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name Thekah Petroleum Co (in liquidation)                  
Registered office Cairo  (Egypt)                  
Country of operation Egypt                  
Share capital   153,000,000                
Shareholders Eni International BV  Third parties                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Six [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 66.67%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Six [Member] | Eni International BV [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 33.33%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Seven [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name United Gas Derivatives Co                  
Registered office London (United Kingdom)                  
Country of operation Indonesia                  
Share capital   1,315,912                
Shareholders Eni Lasmo Plc  Third parties                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Seven [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 50.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Seven [Member] | Eni Lasmo Plc [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 50.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Eight [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name [1] VIC CBM Ltd                  
Registered office London (United Kingdom)                  
Country of operation Indonesia                  
Share capital   631,640                
Shareholders Eni Lasmo Plc  Third parties                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Eight [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 50.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Eight [Member] | Eni Lasmo Plc [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 50.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Nine [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name [1] Virginia Indonesia Co CBM Ltd(†)                  
Registered office Forus (Norway)                  
Country of operation Norway                  
Share capital   399,425,000                
Shareholders Eni International BV  Third parties                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Nine [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 30.40%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Forty Nine [Member] | Eni International BV [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 69.60%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Fifty [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name [1] Vår Energi AS(†) (former Eni Norge AS)                  
Registered office Cairo  (Egypt)                  
Country of operation Egypt                  
Share capital   $ 20,000                
Shareholders Ieoc Exploration BV  Third parties                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Fifty [Member] | Third parties [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 50.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Fifty [Member] | Ieoc Exploration BV [Member]                    
Disclosure of detailed information about investment property [line items]                    
% Ownership 50.00%                  
Outside Italy [Member] | Exploration and Productions [Member] | Subsidiaries Fifty One [Member]                    
Disclosure of detailed information about investment property [line items]                    
Company name [1] West Ashrafi Petroleum Co(†) (in liquidation)                  
[1] F.C. = full consolidation, J.O. = joint operation, Eq. = equity-accounted, Co. = valued at cost, F.V. = valued at fair value
[2] Shares without nominal value.