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Other information about investments (Details 3)
 12 Months Ended
Dec. 31, 2018
EUR (€)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CHF (SFr)
Dec. 31, 2018
EGP (ج.م.)
Dec. 31, 2018
PKR (₨)
Dec. 31, 2018
KZT (₸)
Dec. 31, 2017
EUR (€)
Disclosure of subsidiaries [line items]              
Share capital | € € 4,005,000,000           € 4,005,000,000
% Ownership 80.00%            
Eni Oil Holdings BV [Member]              
Disclosure of subsidiaries [line items]              
% Ownership 0.00%            
In Italy [Member] | Corporate And Financial Companies [Member] | Subsidiaries One [Member]              
Disclosure of subsidiaries [line items]              
Company name Agenzia Giornalistica Italia SpA            
Registered office Rome            
Country of operation Italy            
Share capital   $ 2,000,000          
Shareholders Eni SpA            
% Ownership 100.00%            
% Equity ratio 100.00%            
Consolidation or valutation method [1] F.C.            
In Italy [Member] | Corporate And Financial Companies [Member] | Subsidiaries Two [Member]              
Disclosure of subsidiaries [line items]              
Company name Eni Adfin SpA (in liquidation)            
Registered office Rome            
Country of operation Italy            
Share capital   85,537,498.80          
Shareholders Eni SpA  Third parties            
% Equity ratio 99.67%            
Consolidation or valutation method [1] F.C.            
In Italy [Member] | Corporate And Financial Companies [Member] | Subsidiaries Two [Member] | ENI SPA [Member]              
Disclosure of subsidiaries [line items]              
% Ownership 99.67%            
In Italy [Member] | Corporate And Financial Companies [Member] | Subsidiaries Two [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
% Ownership 0.33%            
In Italy [Member] | Corporate And Financial Companies [Member] | Subsidiaries Three [Member]              
Disclosure of subsidiaries [line items]              
Company name Eni Corporate University SpA            
Registered office San Donato  Milanese (MI)            
Country of operation Italy            
Share capital   3,360,000          
Shareholders Eni SpA            
% Ownership 100.00%            
% Equity ratio 100.00%            
Consolidation or valutation method [1] F.C.            
In Italy [Member] | Corporate And Financial Companies [Member] | Subsidiaries Four [Member]              
Disclosure of subsidiaries [line items]              
Company name EniServizi SpA            
Registered office San Donato  Milanese (MI)            
Country of operation Italy            
Share capital   13,427,419.08          
Shareholders Eni SpA            
% Ownership 100.00%            
% Equity ratio 100.00%            
Consolidation or valutation method [1] F.C.            
In Italy [Member] | Corporate And Financial Companies [Member] | Subsidiaries Five [Member]              
Disclosure of subsidiaries [line items]              
Company name Serfactoring SpA            
Registered office San Donato  Milanese (MI)            
Country of operation Italy            
Share capital   5,160,000          
Shareholders Eni SpA  Third parties            
% Equity ratio 49.00%            
Consolidation or valutation method [1] F.C.            
In Italy [Member] | Corporate And Financial Companies [Member] | Subsidiaries Five [Member] | ENI SPA [Member]              
Disclosure of subsidiaries [line items]              
% Ownership 49.00%            
In Italy [Member] | Corporate And Financial Companies [Member] | Subsidiaries Five [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
% Ownership 51.00%            
In Italy [Member] | Corporate And Financial Companies [Member] | Subsidiaries Six [Member]              
Disclosure of subsidiaries [line items]              
Company name Servizi Aerei SpA            
Registered office San Donato  Milanese (MI)            
Country of operation Italy            
Share capital   79,817,238          
Shareholders Eni SpA            
% Ownership 100.00%            
% Equity ratio 100.00%            
Consolidation or valutation method [1] F.C.            
In Italy [Member] | Other Activities [Member] | Subsidiaries One [Member]              
Disclosure of subsidiaries [line items]              
Company name Anic Partecipazioni SpA (in liquidation)            
Registered office Ferrandina (MT)            
Country of operation Italy            
Share capital | € € 4,644,000            
Consolidation or valutation method [1] Eq.            
In Italy [Member] | Other Activities [Member] | Subsidiaries One [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Third parties            
% Ownership 0.03%            
In Italy [Member] | Other Activities [Member] | Subsidiaries One [Member] | Syndial SpA [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Syndial SpA            
% Ownership 99.97%            
In Italy [Member] | Other Activities [Member] | Subsidiaries One [Member] | Gela CL [Member]              
Disclosure of subsidiaries [line items]              
Registered office Gela (CL)            
In Italy [Member] | Other Activities [Member] | Subsidiaries One [Member] | Anic Partecipazioni SpA [Member]              
Disclosure of subsidiaries [line items]              
Share capital | € € 23,519,847.16            
In Italy [Member] | Other Activities [Member] | Subsidiaries Two [Member]              
Disclosure of subsidiaries [line items]              
Company name Eni Energia Srl            
Registered office Nuoro            
Country of operation Italy            
Share capital | € € 516,000            
Consolidation or valutation method [1] Co.            
In Italy [Member] | Other Activities [Member] | Subsidiaries Two [Member] | ENI SPA [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Eni SpA            
% Ownership 100.00%            
In Italy [Member] | Other Activities [Member] | Subsidiaries Two [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Third parties            
In Italy [Member] | Other Activities [Member] | Subsidiaries Two [Member] | Syndial SpA [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Syndial SpA            
In Italy [Member] | Other Activities [Member] | Subsidiaries Two [Member] | Eni Energia Srl [Member]              
Disclosure of subsidiaries [line items]              
Registered office San Donato  Milanese (MI)            
Share capital | € € 10,000            
In Italy [Member] | Other Activities [Member] | Subsidiaries Three [Member]              
Disclosure of subsidiaries [line items]              
Company name Eni New Energy SpA            
Registered office San Donato  Milanese (MI)            
Country of operation Italy            
Share capital | € € 2,191,384,693            
% Equity ratio 100.00%            
Consolidation or valutation method [1] F.C.            
In Italy [Member] | Other Activities [Member] | Subsidiaries Three [Member] | ENI SPA [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Eni SpA            
% Ownership 100.00%            
In Italy [Member] | Other Activities [Member] | Subsidiaries Three [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Third parties            
In Italy [Member] | Other Activities [Member] | Subsidiaries Three [Member] | Eni New Energy SpA [Member]              
Disclosure of subsidiaries [line items]              
Share capital | € € 9,296,000            
In Italy [Member] | Other Activities [Member] | Subsidiaries Four [Member]              
Disclosure of subsidiaries [line items]              
Company name Industria Siciliana Acido Fosforico - ISAF - SpA (in liquidation)            
Registered office Gela (CL)            
Country of operation Italy            
Share capital | € € 1,300,000            
Consolidation or valutation method [1] Eq.            
In Italy [Member] | Other Activities [Member] | Subsidiaries Four [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Third parties            
% Ownership 48.00%            
In Italy [Member] | Other Activities [Member] | Subsidiaries Four [Member] | Syndial SpA [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Syndial SpA            
% Ownership 52.00%            
In Italy [Member] | Other Activities [Member] | Subsidiaries Five [Member]              
Disclosure of subsidiaries [line items]              
Company name Ing. Luigi Conti Vecchi SpA            
Registered office Assemini (CA)            
Country of operation Italy            
Share capital | € € 5,518,620.64            
% Equity ratio 100.00%            
Consolidation or valutation method [1] F.C.            
In Italy [Member] | Other Activities [Member] | Subsidiaries Five [Member] | Syndial SpA [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Syndial SpA            
% Ownership 100.00%            
In Italy [Member] | Other Activities [Member] | Subsidiaries Six [Member]              
Disclosure of subsidiaries [line items]              
Company name Syndial Servizi Ambientali SpA            
Registered office San Donato  Milanese (MI)            
Country of operation Italy            
Share capital | € € 425,647,621.42            
% Equity ratio 100.00%            
Consolidation or valutation method [1] F.C.            
In Italy [Member] | Other Activities [Member] | Subsidiaries Six [Member] | ENI SPA [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Eni SpA            
% Ownership 99.99%            
In Italy [Member] | Other Activities [Member] | Subsidiaries Six [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Third parties            
% Ownership (8212.00%)            
Outside Italy [Member] | Corporate And Financial Companies [Member] | Subsidiaries One [Member]              
Disclosure of subsidiaries [line items]              
Company name Banque Eni SA            
Registered office Bruxelles  (Belgium)            
Country of operation Belgium            
Share capital   50,000,000          
Shareholders Eni International BV  Eni Oil Holdings BV            
% Equity ratio 100.00%            
Consolidation or valutation method [1] F.C.            
Outside Italy [Member] | Corporate And Financial Companies [Member] | Subsidiaries One [Member] | Eni International BV [Member]              
Disclosure of subsidiaries [line items]              
% Ownership 99.90%            
Outside Italy [Member] | Corporate And Financial Companies [Member] | Subsidiaries One [Member] | Eni Oil Holdings BV [Member]              
Disclosure of subsidiaries [line items]              
% Ownership 0.10%            
Outside Italy [Member] | Corporate And Financial Companies [Member] | Subsidiaries Two [Member]              
Disclosure of subsidiaries [line items]              
Company name Eni Finance  International SA            
Registered office Bruxelles  (Belgium)            
Country of operation Belgium            
Share capital   2,474,225,632          
Shareholders Eni International BV  Eni SpA            
% Equity ratio 100.00%            
Consolidation or valutation method [1] F.C.            
Outside Italy [Member] | Corporate And Financial Companies [Member] | Subsidiaries Two [Member] | ENI SPA [Member]              
Disclosure of subsidiaries [line items]              
% Ownership 33.61%            
Outside Italy [Member] | Corporate And Financial Companies [Member] | Subsidiaries Two [Member] | Eni International BV [Member]              
Disclosure of subsidiaries [line items]              
% Ownership 66.39%            
Outside Italy [Member] | Corporate And Financial Companies [Member] | Subsidiaries Three [Member]              
Disclosure of subsidiaries [line items]              
Company name Eni Finance USA Inc            
Registered office Dover Delaware (USA)            
Country of operation USA            
Share capital   15,000,000          
Shareholders Eni Petroleum Co Inc            
% Ownership 100.00%            
% Equity ratio 100.00%            
Consolidation or valutation method [1] F.C.            
Outside Italy [Member] | Corporate And Financial Companies [Member] | Subsidiaries Four [Member]              
Disclosure of subsidiaries [line items]              
Company name Eni Insurance Designated Activity Company            
Registered office Dublin  (Ireland)            
Country of operation Ireland            
Share capital   500,000,000          
Shareholders Eni SpA            
% Ownership 100.00%            
% Equity ratio 100.00%            
Consolidation or valutation method [1] F.C.            
Outside Italy [Member] | Corporate And Financial Companies [Member] | Subsidiaries Five [Member]              
Disclosure of subsidiaries [line items]              
Company name Eni International  BV            
Registered office Amsterdam  (Netherlands)            
Country of operation Netherlands            
Share capital   641,683,425          
Shareholders Eni SpA            
% Ownership 100.00%            
% Equity ratio 100.00%            
Consolidation or valutation method [1] F.C.            
Outside Italy [Member] | Corporate And Financial Companies [Member] | Subsidiaries Six [Member]              
Disclosure of subsidiaries [line items]              
Company name Eni International  Resources Ltd            
Registered office London  (United Kingdom)            
Country of operation United Kingdom            
Share capital   50,000          
Shareholders Eni SpA  Eni UK Ltd            
% Equity ratio 100.00%            
Consolidation or valutation method [1] F.C.            
Outside Italy [Member] | Corporate And Financial Companies [Member] | Subsidiaries Six [Member] | ENI SPA [Member]              
Disclosure of subsidiaries [line items]              
% Ownership 99.99%            
Outside Italy [Member] | Corporate And Financial Companies [Member] | Subsidiaries Six [Member] | Eni UK Ltd [Member]              
Disclosure of subsidiaries [line items]              
% Ownership 8212.00%            
Outside Italy [Member] | Corporate And Financial Companies [Member] | Subsidiaries Seven [Member]              
Disclosure of subsidiaries [line items]              
Company name Eni Next Llc            
Registered office Houston  (USA)            
Country of operation USA            
Share capital   $ 100          
Shareholders Eni Petroleum Co Inc            
% Ownership 100.00%            
% Equity ratio 100.00%            
Consolidation or valutation method [1] F.C.            
Outside Italy [Member] | Other Activities [Member] | Subsidiaries One [Member]              
Disclosure of subsidiaries [line items]              
Company name Arm Wind Llp            
Registered office Saddar Town- Karachi (Pakistan)            
Country of operation Kazakhstan            
Share capital         ₨ 1,200,000 ₸ 2,133,967,100  
% Equity ratio 90.00%            
Consolidation or valutation method [1] F.C.            
Outside Italy [Member] | Other Activities [Member] | Subsidiaries One [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Third parties            
Outside Italy [Member] | Other Activities [Member] | Subsidiaries One [Member] | Windirect BV [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Windirect BV            
% Ownership 100.00%            
Outside Italy [Member] | Other Activities [Member] | Subsidiaries One [Member] | Eni International BV [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Eni International BV            
Outside Italy [Member] | Other Activities [Member] | Subsidiaries One [Member] | Arm Wind Lip [Member]              
Disclosure of subsidiaries [line items]              
Registered office Astana  (Kazakhstan)            
Outside Italy [Member] | Other Activities [Member] | Subsidiaries Two [Member]              
Disclosure of subsidiaries [line items]              
Company name Eni New Energy Egypt SAE            
Registered office Cairo  (Egypt)            
Country of operation Egypt            
Share capital | ج.م.       ج.م. 250,000      
Consolidation or valutation method [1] Eq.            
Outside Italy [Member] | Other Activities [Member] | Subsidiaries Two [Member] | Eni International BV [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Eni International BV            
% Ownership 99.98%            
Outside Italy [Member] | Other Activities [Member] | Subsidiaries Two [Member] | Ieoc Exploration BV [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Ieoc Exploration BV            
% Ownership 0.01%            
Outside Italy [Member] | Other Activities [Member] | Subsidiaries Two [Member] | Ieoc Production BV [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Ieoc Production BV            
% Ownership 0.01%            
Outside Italy [Member] | Other Activities [Member] | Subsidiaries Three [Member]              
Disclosure of subsidiaries [line items]              
Company name Oleodotto del Reno SA            
Registered office Coira  (Switzerland)            
Country of operation Switzerland            
Share capital | SFr     SFr 1,550,000        
Consolidation or valutation method [1] Eq.            
Outside Italy [Member] | Other Activities [Member] | Subsidiaries Three [Member] | Syndial SpA [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Syndial SpA            
% Ownership 100.00%            
Outside Italy [Member] | Other Activities [Member] | Subsidiaries Four [Member]              
Disclosure of subsidiaries [line items]              
Company name Windirect BV            
Registered office Amsterdam  (Netherlands)            
Country of operation Netherlands            
Share capital | € € 10,000            
% Equity ratio 90.00%            
Consolidation or valutation method [1] F.C.            
Outside Italy [Member] | Other Activities [Member] | Subsidiaries Four [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Third parties            
% Ownership 10.00%            
Outside Italy [Member] | Other Activities [Member] | Subsidiaries Four [Member] | Eni International BV [Member]              
Disclosure of subsidiaries [line items]              
Shareholders Eni International BV            
% Ownership 90.00%            
[1] F.C. = full consolidation, J.O. = joint operation, Eq. = equity-accounted, Co. = valued at cost, F.V. = valued at fair value