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Other information about investments (Details 7)
 12 Months Ended
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
GBP (£)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
XAF ( )
Dec. 31, 2017
UAH (₴)
Dec. 31, 2017
EGP (ج.م.)
Dec. 31, 2017
CAD ($)
Dec. 31, 2017
TND (د.ت)
Dec. 31, 2017
TRY (₺)
Dec. 31, 2017
KZT (₸)
Dec. 31, 2017
MZN (MT)
Dec. 31, 2017
VEF ( )
Dec. 31, 2017
KWD (د.ك)
Dec. 31, 2017
HRK (kn)
Dec. 31, 2017
AED (د.إ)
Dec. 31, 2016
EUR (€)
Disclosure of subsidiaries [line items]                                
Share capital | € € 4,005,000,000                             € 4,005,000,000
Italy [Member] | Exploration & Production [Member] | Subsidiaries One [Member]                                
Disclosure of subsidiaries [line items]                                
Company name [1] Mozambique Rovuma Venture SpA(†) (former Eni East Africa SpA)                              
Registered office San Donato Milanese (MI)                              
Country of operation Mozambique                              
Share capital | € € 20,000,000                              
Leverage Equity Ratio 35.71%                              
Consolidation or valutation method [2] J.O.                              
Italy [Member] | Exploration & Production [Member] | Subsidiaries One [Member] | Eni SpA [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Eni SpA                              
% Ownership 35.71%                              
Italy [Member] | Exploration & Production [Member] | Subsidiaries One [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 64.29%                              
Italy [Member] | Exploration & Production [Member] | Subsidiaries Two [Member]                                
Disclosure of subsidiaries [line items]                                
Company name [1] Società Oleodotti Meridionali -SOM SpA(†)                              
Registered office San Donato Milanese (MI)                              
Country of operation Italy                              
Share capital | € € 3,085,000                              
Leverage Equity Ratio 70.00%                              
Consolidation or valutation method [2] J.O.                              
Italy [Member] | Exploration & Production [Member] | Subsidiaries Two [Member] | Eni SpA [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Eni SpA                              
% Ownership 70.00%                              
Italy [Member] | Exploration & Production [Member] | Subsidiaries Two [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 30.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries One [Member]                                
Disclosure of subsidiaries [line items]                                
Company name [1] Agiba Petroleum Co(†)                              
Registered office Cairo (Egypt)                              
Country of operation Egypt                              
Share capital           ج.م. 20,000                    
Consolidation or valutation method [2] Co.                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries One [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 50.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries One [Member] | Ieoc Production BV [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Ieoc Production BV                              
% Ownership 50.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Two [Member]                                
Disclosure of subsidiaries [line items]                                
Company name Angola LNG Ltd                              
Registered office Hamilton (Bermuda)                              
Country of operation Angola                              
Share capital | $     $ 10,907,000,000                          
Consolidation or valutation method [2] Eq.                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Two [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 86.40%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Two [Member] | Eni Angola Prod.BV [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Eni Angola Prod.BV                              
% Ownership 13.60%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Three [Member]                                
Disclosure of subsidiaries [line items]                                
Company name Ashrafi Island Petroleum Co                              
Registered office Cairo (Egypt)                              
Country of operation Egypt                              
Share capital           20,000                    
Consolidation or valutation method [2] Co.                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Three [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 75.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Three [Member] | Ieoc Production BV [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Ieoc Production BV                              
% Ownership 25.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Four [Member]                                
Disclosure of subsidiaries [line items]                                
Company name [1] Barentsmorneftegaz Sàrl(†)                              
Registered office Luxembourg (Luxembourg)                              
Country of operation Russia                              
Share capital | $     20,000                          
Consolidation or valutation method [2] Eq.                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Four [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 66.67%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Four [Member] | Eni Energy Russia BV [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Eni Energy Russia BV                              
% Ownership 33.33%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Five [Member]                                
Disclosure of subsidiaries [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 [2] Co.                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Five [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 50.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Five [Member] | Eni Mozam.LNG H. BV [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Eni Mozam.LNG H. BV                              
% Ownership 50.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Six [Member]                                
Disclosure of subsidiaries [line items]                                
Company name [1] Cardón IV SA(†)                              
Registered office Caracas (Venezuela)                              
Country of operation Venezuela                              
Share capital |                       17,210,000        
Consolidation or valutation method [2] Eq.                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Six [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 50.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Six [Member] | Eni Venezuela BV [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Eni Venezuela BV                              
% Ownership 50.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Seven [Member]                                
Disclosure of subsidiaries [line items]                                
Company name Compañia Agua Plana SA                              
Registered office Caracas (Venezuela)                              
Country of operation Venezuela                              
Share capital |                       100        
Consolidation or valutation method [2] Co.                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Seven [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 74.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Seven [Member] | Eni Venezuela BV [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Eni Venezuela BV                              
% Ownership 26.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Eight [Member]                                
Disclosure of subsidiaries [line items]                                
Company name Coral FLNG SA                              
Registered office Maputo (Mozambique)                              
Country of operation Mozambique                              
Share capital | MT                     100,000,000          
Consolidation or valutation method [2] Eq.                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Eight [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 75.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Eight [Member] | Eni Mozam.LNG H. BV [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Eni Mozam.LNG H. BV                              
% Ownership 25.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Nine [Member]                                
Disclosure of subsidiaries [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 [2] Eq.                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Nine [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 50.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Nine [Member] | Eni Mozam.LNG H. BV [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Eni Mozam.LNG H. BV                              
% Ownership 50.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Ten [Member]                                
Disclosure of subsidiaries [line items]                                
Company name East Delta Gas Co (in liquidation)                              
Registered office Cairo (Egypt)                              
Country of operation Egypt                              
Share capital           20,000                    
Consolidation or valutation method [2] Co.                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Ten [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 62.50%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Ten [Member] | Ieoc Production BV [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Ieoc Production BV                              
% Ownership 37.50%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Eleven [Member]                                
Disclosure of subsidiaries [line items]                                
Company name [1] East Kanayis Petroleum Co(†)                              
Registered office Cairo (Egypt)                              
Country of operation Egypt                              
Share capital           20,000                    
Consolidation or valutation method [2] Co.                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Eleven [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 50.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Eleven [Member] | Ieoc Production BV [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Ieoc Production BV                              
% Ownership 50.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Twelve [Member]                                
Disclosure of subsidiaries [line items]                                
Company name [1] East Obaiyed Petroleum Company(†)                              
Registered office Cairo (Egypt)                              
Country of operation Egypt                              
Share capital           20,000                    
Consolidation or valutation method [2] Co.                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Twelve [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 50.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Twelve [Member] | Ieoc SpA [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Ieoc SpA                              
% Ownership 50.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Thirteen [Member]                                
Disclosure of subsidiaries [line items]                                
Company name [1] El-Fayrouz Petroleum Co(†) (in liquidation)                              
Registered office Cairo (Egypt)                              
Country of operation Egypt                              
Share capital           20,000                    
Consolidation or valutation method [2] Co.                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Thirteen [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 50.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Thirteen [Member] | Ieoc Exploration BV [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Ieoc Exploration BV                              
% Ownership 50.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Fourteen [Member]                                
Disclosure of subsidiaries [line items]                                
Company name El Temsah Petroleum Co                              
Registered office Cairo (Egypt)                              
Country of operation Egypt                              
Share capital           20,000                    
Consolidation or valutation method [2] Co.                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Fourteen [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 75.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Fourteen [Member] | Ieoc Production BV [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Ieoc Production BV                              
% Ownership 25.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Fifteen [Member]                                
Disclosure of subsidiaries [line items]                                
Company name Enstar Petroleum Ltd                              
Registered office Calgary (Canada)                              
Country of operation Canada                              
Share capital | $             $ 0.1                  
Shareholders Unimar Llc                              
% Ownership 100.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Sixteen [Member]                                
Disclosure of subsidiaries [line items]                                
Company name [1] Fedynskmorneftegaz Sàrl(†)                              
Registered office Luxembourg (Luxembourg)                              
Country of operation Russia                              
Share capital | $     20,000                          
Consolidation or valutation method [2] Eq.                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Sixteen [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 66.67%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Sixteen [Member] | Eni Energy Russia BV [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Eni Energy Russia BV                              
% Ownership 33.33%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Seventeen [Member]                                
Disclosure of subsidiaries [line items]                                
Company name [1] InAgip doo(†)                              
Registered office Zagreb (Croatia)                              
Country of operation Croatia                              
Share capital | kn                           kn 54,000    
Consolidation or valutation method [2] Co.                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Seventeen [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 50.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Seventeen [Member] | Eni Croatia BV [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Eni Croatia BV                              
% Ownership 50.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Eighteen [Member]                                
Disclosure of subsidiaries [line items]                                
Company name Karachaganak Petroleum Operating BV                              
Registered office Amsterdam (Netherlands)                              
Country of operation Kazakhstan                              
Share capital | € € 20,000                              
Consolidation or valutation method [2] Co.                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Eighteen [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 70.75%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Eighteen [Member] | Agip Karachag.BV [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Agip Karachag.BV                              
% Ownership 29.25%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Nineteen [Member]                                
Disclosure of subsidiaries [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 [2] Eq.                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Nineteen [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 62.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Nineteen [Member] | Agip Karachag.BV [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Agip Karachag.BV                              
% Ownership 38.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Twenty [Member]                                
Disclosure of subsidiaries [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 [2] Eq.                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Twenty [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 51.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Twenty [Member] | Eni Middle E. Ltd [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Eni Middle E. Ltd                              
% Ownership 49.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Twenty One [Member]                                
Disclosure of subsidiaries [line items]                                
Company name Liberty National Development Co Llc                              
Registered office Wilmington (USA)                              
Country of operation USA                              
Share capital | $ [3]     0                          
Consolidation or valutation method [2] Eq.                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Twenty One [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 67.50%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Twenty One [Member] | Eni Oil & Gas Inc [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Eni Oil & Gas Inc                              
% Ownership 32.50%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Twenty Two [Member]                                
Disclosure of subsidiaries [line items]                                
Company name [1],[2] Llc ‘Westgasinvest’(†)                              
Registered office Lviv (Ukraine)                              
Country of operation Ukraine                              
Share capital | ₴         ₴ 2,000,000                      
Consolidation or valutation method [2] Eq.                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Twenty Two [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 49.99%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Twenty Two [Member] | Eni Ukraine Hold.BV [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Eni Ukraine Hold.BV                              
% Ownership 50.01%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Twenty Three [Member]                                
Disclosure of subsidiaries [line items]                                
Company name Mediterranean Gas Co                              
Registered office Cairo (Egypt)                              
Country of operation Egypt                              
Share capital           20,000                    
Consolidation or valutation method [2] Co.                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Twenty Three [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 75.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Twenty Three [Member] | Ieoc Production BV [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Ieoc Production BV                              
% Ownership 25.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Twenty Four [Member]                                
Disclosure of subsidiaries [line items]                                
Company name Mellitah Oil & Gas BV(†)                              
Registered office Amsterdam (Netherlands)                              
Country of operation Libya                              
Share capital | € € 20,000                              
Consolidation or valutation method [2] Co.                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Twenty Four [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 50.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Twenty Four [Member] | Eni North Africa BV [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Eni North Africa BV                              
% Ownership 50.00%                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesTwenty Five [Member]                                
Disclosure of subsidiaries [line items]                                
Company name Nile Delta Oil Co Nidoco                              
Registered office Cairo (Egypt)                              
Country of operation Egypt                              
Share capital           20,000                    
Consolidation or valutation method [2] Co.                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesTwenty Five [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 62.50%                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesTwenty Five [Member] | Ieoc Production BV [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Ieoc Production BV                              
% Ownership 37.50%                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesTwenty Six [Member]                                
Disclosure of subsidiaries [line items]                                
Company name North Bardawil Petroleum Co                              
Registered office Cairo (Egypt)                              
Country of operation Egypt                              
Share capital           20,000                    
Consolidation or valutation method [2] Co.                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesTwenty Six [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 70.00%                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesTwenty Six [Member] | Ieoc Exploration BV [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Ieoc Exploration BV                              
% Ownership 30.00%                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesTwenty Seven [Member]                                
Disclosure of subsidiaries [line items]                                
Company name North El Burg Petroleum Co                              
Registered office Cairo (Egypt)                              
Country of operation Egypt                              
Share capital           20,000                    
Consolidation or valutation method [2] Co.                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesTwenty Seven [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 75.00%                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesTwenty Seven [Member] | Ieoc SpA [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Ieoc SpA                              
% Ownership 25.00%                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesTwenty Eight [Member]                                
Disclosure of subsidiaries [line items]                                
Company name Petrobel Belayim Petroleum Co(†)                              
Registered office Cairo (Egypt)                              
Country of operation Egypt                              
Share capital           20,000                    
Consolidation or valutation method [2] Co.                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesTwenty Eight [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 50.00%                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesTwenty Eight [Member] | Ieoc Production BV [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Ieoc Production BV                              
% Ownership 50.00%                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesTwenty Nine [Member]                                
Disclosure of subsidiaries [line items]                                
Company name PetroBicentenario SA(†)                              
Registered office Caracas (Venezuela)                              
Country of operation Venezuela                              
Share capital |                       379,000,000        
Consolidation or valutation method [2] Eq.                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesTwenty Nine [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 60.00%                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesTwenty Nine [Member] | Eni Lasmo Plc [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Eni Lasmo Plc                              
% Ownership 40.00%                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesThirty [Member]                                
Disclosure of subsidiaries [line items]                                
Company name PetroJunín SA(†)                              
Registered office Caracas (Venezuela)                              
Country of operation Venezuela                              
Share capital |                       2,402,100,000        
Consolidation or valutation method [2] Eq.                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesThirty [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 60.00%                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesThirty [Member] | Eni Lasmo Plc [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Eni Lasmo Plc                              
% Ownership 40.00%                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesThirty One [Member]                                
Disclosure of subsidiaries [line items]                                
Company name PetroSucre SA                              
Registered office Caracas (Venezuela)                              
Country of operation Venezuela                              
Share capital |                       220,300,000        
Consolidation or valutation method [2] Eq.                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesThirty One [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 74.00%                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesThirty One [Member] | Eni Venezuela BV [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Eni Venezuela BV                              
% Ownership 26.00%                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesThirty Two [Member]                                
Disclosure of subsidiaries [line items]                                
Company name Pharaonic Petroleum Co                              
Registered office Cairo (Egypt)                              
Country of operation Egypt                              
Share capital           20,000                    
Consolidation or valutation method [2] Co.                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesThirty Two [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 75.00%                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesThirty Two [Member] | Ieoc Production BV [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Ieoc Production BV                              
% Ownership 25.00%                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesThirty Three [Member]                                
Disclosure of subsidiaries [line items]                                
Company name Port Said Petroleum Co(†)                              
Registered office Cairo (Egypt)                              
Country of operation Egypt                              
Share capital           20,000                    
Consolidation or valutation method [2] Co.                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesThirty Three [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 50.00%                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesThirty Three [Member] | Ieoc Production BV [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Ieoc Production BV                              
% Ownership 50.00%                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesThirty Four [Member]                                
Disclosure of subsidiaries [line items]                                
Company name Raml Petroleum Co                              
Registered office Cairo (Egypt)                              
Country of operation Egypt                              
Share capital           20,000                    
Consolidation or valutation method [2] Co.                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesThirty Four [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 77.50%                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesThirty Four [Member] | Ieoc Production BV [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Ieoc Production BV                              
% Ownership 22.50%                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesThirty Five [Member]                                
Disclosure of subsidiaries [line items]                                
Company name Ras Qattara Petroleum Co                              
Registered office Cairo (Egypt)                              
Country of operation Egypt                              
Share capital           20,000                    
Consolidation or valutation method [2] Co.                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesThirty Five [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 62.50%                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesThirty Five [Member] | Ieoc Production BV [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Ieoc Production BV                              
% Ownership 37.50%                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesThirty Six [Member]                                
Disclosure of subsidiaries [line items]                                
Company name Rovuma Basin LNG Land Limitada(†)                              
Registered office Maputo (Mozambique)                              
Country of operation Mozambique                              
Share capital | MT                     MT 140,000          
Consolidation or valutation method [2] Co.                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesThirty Six [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 66.67%                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesThirty Six [Member] | Mozamb. Rov. V. SpA [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Mozamb. Rov. V. SpA                              
% Ownership 33.33%                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesThirty Seven [Member]                                
Disclosure of subsidiaries [line items]                                
Company name Shatskmorneftegaz Sàrl(†)                              
Registered office Luxembourg (Luxembourg)                              
Country of operation Russia                              
Share capital | $     20,000                          
Consolidation or valutation method [2] Eq.                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesThirty Seven [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 66.67%                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesThirty Seven [Member] | Eni Energy Russia BV [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Eni Energy Russia BV                              
% Ownership 33.33%                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesThirty Eight [Member]                                
Disclosure of subsidiaries [line items]                                
Company name Shorouk Petroleum Company                              
Registered office Cairo (Egypt)                              
Country of operation Egypt                              
Share capital           20,000                    
Consolidation or valutation method [2] Co.                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesThirty Eight [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 70.00%                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesThirty Eight [Member] | Ieoc Production BV [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Ieoc Production BV                              
% Ownership 30.00%                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesThirty Nine [Member]                                
Disclosure of subsidiaries [line items]                                
Company name Société Centrale Electrique du Congo SA                              
Registered office Pointe-Noire (Republic of the Congo)                              
Country of operation Republic of the Congo                              
Share capital |       44,732,000,000                        
Consolidation or valutation method [2] Eq.                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesThirty Nine [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 80.00%                              
Outside Italy [Member] | Exploration & Production [Member] | SubsidiariesThirty Nine [Member] | Eni Congo SA [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Eni Congo SA                              
% Ownership 20.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Fourty [Member]                                
Disclosure of subsidiaries [line items]                                
Company name Société Italo Tunisienne d’Exploitation Pétrolière SA(†)                              
Registered office Tunisi (Tunisia) Tunisia                              
Share capital | د.ت               د.ت 5,000,000                
Consolidation or valutation method [2] Eq.                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Fourty [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 50.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Fourty [Member] | Eni Tunisia BV [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Eni Tunisia BV                              
% Ownership 50.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Fourty One [Member]                                
Disclosure of subsidiaries [line items]                                
Company name Sodeps - Société de Developpement et d’Exploitation du Permis du Sud SA(†)                              
Registered office Tunisi (Tunisia)                              
Country of operation Tunisia                              
Share capital | د.ت               د.ت 100,000                
Consolidation or valutation method [2] Co.                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Fourty One [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 50.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Fourty One [Member] | Eni Tunisia BV [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Eni Tunisia BV                              
% Ownership 50.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Fourty Two [Member]                                
Disclosure of subsidiaries [line items]                                
Company name Tapco Petrol Boru Hatti Sanayi ve Ticaret AS(†)                              
Registered office Istanbul (Turkey)                              
Country of operation Turkey                              
Share capital | ₺                 ₺ 9,850,000              
Consolidation or valutation method [2] Eq.                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Fourty Two [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 50.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Fourty Two [Member] | Eni International BV [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Eni International BV                              
% Ownership 50.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Fourty Three [Member]                                
Disclosure of subsidiaries [line items]                                
Company name Tecninco Engineering Contractors Llp(†)                              
Registered office Aksai (Kazakhstan)                              
Country of operation Kazakhstan                              
Share capital | ₸                   ₸ 29,478,455            
Consolidation or valutation method [2] Eq.                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Fourty Three [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 51.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Fourty Three [Member] | EniProgetti SpA [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders EniProgetti SpA                              
% Ownership 49.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Fourty Four [Member]                                
Disclosure of subsidiaries [line items]                                
Company name Thekah Petroleum Co                              
Registered office Cairo (Egypt)                              
Country of operation Egypt                              
Share capital           20,000                    
Consolidation or valutation method [2] Co.                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Fourty Four [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 75.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Fourty Four [Member] | Ieoc Exploration BV [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Ieoc Exploration BV                              
% Ownership 25.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Fourty Five [Member]                                
Disclosure of subsidiaries [line items]                                
Company name Unimar Llc(†)                              
Registered office Houston (USA)                              
Country of operation USA                              
Share capital | $ [3]     0                          
Consolidation or valutation method [2] Co.                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Fourty Five [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 50.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Fourty Five [Member] | Eni America Ltd [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Eni America Ltd                              
% Ownership 50.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Fourty Six [Member]                                
Disclosure of subsidiaries [line items]                                
Company name United Gas Derivatives Co                              
Registered office Cairo (Egypt)                              
Country of operation Egypt                              
Share capital | $     195,000,000                          
Consolidation or valutation method [2] Eq.                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Fourty Six [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 66.67%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Fourty Six [Member] | Eni International BV [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Eni International BV                              
% Ownership 33.33%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Fourty Seven [Member]                                
Disclosure of subsidiaries [line items]                                
Company name VIC CBM Ltd(†)                              
Registered office London (United Kingdom)                              
Country of operation Indonesia                              
Share capital | $     1,315,912                          
Consolidation or valutation method [2] Eq.                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Fourty Seven [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 50.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Fourty Seven [Member] | Eni Lasmo Plc [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Eni Lasmo Plc                              
% Ownership 50.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Fourty Eight [Member]                                
Disclosure of subsidiaries [line items]                                
Company name Virginia Indonesia Co CBM Ltd(†)                              
Registered office London (United Kingdom)                              
Country of operation Indonesia                              
Share capital | $     631,640                          
Consolidation or valutation method [2] Eq.                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Fourty Eight [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 50.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Fourty Eight [Member] | Eni Lasmo Plc [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Eni Lasmo Plc                              
% Ownership 50.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Fourty Nine [Member]                                
Disclosure of subsidiaries [line items]                                
Company name Virginia Indonesia Co Llc                              
Registered office Wilmington (USA)                              
Country of operation Indonesia                              
Share capital | $     10                          
Shareholders Unimar Llc                              
% Ownership 100.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Fifty [Member]                                
Disclosure of subsidiaries [line items]                                
Company name Virginia International Co Llc                              
Registered office Wilmington (USA)                              
Country of operation Indonesia                              
Share capital | $     $ 10                          
Shareholders Unimar Llc                              
% Ownership 100.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Fifty One [Member]                                
Disclosure of subsidiaries [line items]                                
Company name West Ashrafi Petroleum Co(†) (in liquidation)                              
Registered office Cairo (Egypt)                              
Country of operation Egypt                              
Share capital           ج.م. 20,000                    
Consolidation or valutation method [2] Co.                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Fifty One [Member] | Third parties [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Third parties                              
% Ownership 50.00%                              
Outside Italy [Member] | Exploration & Production [Member] | Subsidiaries Fifty One [Member] | Ieoc Exploration BV [Member]                                
Disclosure of subsidiaries [line items]                                
Shareholders Ieoc Exploration BV                              
% Ownership 50.00%                              
[1] Controlling interest: Ecofuel SpA 50.00 Third parties 50.00
[2] Jointly controlled entity.
[3] Shares without nominal value.