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Other information about investments (Details 9)
 12 Months Ended
Dec. 31, 2018
EUR (€)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
EGP (ج.م.)
Dec. 31, 2018
AOA (Kz)
Dec. 31, 2018
VEF ( )
Dec. 31, 2018
AUD ($)
Dec. 31, 2017
EUR (€)
Disclosure of subsidiaries [line items]              
Share capital | € € 4,005,000,000           € 4,005,000,000
Other significant investments Exploration Production [Member]              
Disclosure of subsidiaries [line items]              
Company name New Liberty Residential Co Llc            
Registered office West Trenton  (USA)            
Country of operation USA            
Consolidation or valutation method [1] F.V.            
Other significant investments Exploration Production [Member] | Subsidiaries One [Member]              
Disclosure of subsidiaries [line items]              
Company name Administradora del Golfo de Paria Este SA            
Registered office Caracas  (Venezuela)            
Country of operation Venezuela            
Share capital |         0.001    
Consolidation or valutation method [1] F.V.            
Other significant investments Exploration Production [Member] | Subsidiaries Two [Member]              
Disclosure of subsidiaries [line items]              
Company name Brass LNG Ltd            
Registered office Lagos  (Nigeria)            
Country of operation Nigeria            
Share capital   $ 1,000,000          
Consolidation or valutation method [1] F.V.            
Other significant investments Exploration Production [Member] | Subsidiaries Three [Member]              
Disclosure of subsidiaries [line items]              
Company name Darwin LNG Pty Ltd            
Registered office West Perth  (Australia)            
Country of operation Australia            
Consolidation or valutation method [1] F.V.            
Other significant investments Exploration Production [Member] | Subsidiaries Five [Member]              
Disclosure of subsidiaries [line items]              
Company name Nigeria LNG Ltd            
Registered office Port Harcourt  (Nigeria)            
Country of operation Nigeria            
Share capital   1,138,207,000          
Consolidation or valutation method [1] F.V.            
Other significant investments Exploration Production [Member] | Subsidiaries Six [Member]              
Disclosure of subsidiaries [line items]              
Company name North Caspian Operating Company NV            
Registered office Amsterdam  (Netherlands)            
Country of operation Kazakhstan            
Share capital | € € 128,520            
Consolidation or valutation method [1] F.V.            
Other significant investments Exploration Production [Member] | Subsidiaries Seven [Member]              
Disclosure of subsidiaries [line items]              
Company name OPCO - Sociedade Operacional Angola LNG SA            
Registered office Luanda  (Angola)            
Country of operation Angola            
Share capital | Kz       Kz 7,400,000      
Consolidation or valutation method [1] F.V.            
Other significant investments Exploration Production [Member] | Subsidiaries Eight [Member]              
Disclosure of subsidiaries [line items]              
Company name Petrolera Güiria SA            
Registered office Caracas  (Venezuela)            
Country of operation Venezuela            
Share capital |         10    
Consolidation or valutation method [1] F.V.            
Other significant investments Exploration Production [Member] | Subsidiaries Nine [Member]              
Disclosure of subsidiaries [line items]              
Company name SOMG - Sociedade de Operações e Manutenção de Gasodutos SA            
Registered office Luanda  (Angola)            
Country of operation Angola            
Share capital | Kz       Kz 7,400,000      
Consolidation or valutation method [1] F.V.            
Other significant investments Exploration Production [Member] | Subsidiaries Ten [Member]              
Disclosure of subsidiaries [line items]              
Company name Torsina Oil Co            
Registered office Cairo  (Egypt)            
Country of operation Egypt            
Share capital | ج.م.     ج.م. 20,000        
Consolidation or valutation method [1] F.V.            
In Italy [Member] | Other significant investments Exploration Production [Member] | Subsidiaries One [Member]              
Disclosure of subsidiaries [line items]              
Company name Consorzio Universitario in Ingegneria per la Qualità e  l’Innovazione            
Registered office Pisa            
Country of operation Italy            
Share capital | € € 135,000            
Consolidation or valutation method [1] F.V.            
In Italy [Member] | Other significant investments Exploration Production [Member] | Subsidiaries One [Member] | ENI SPA [Member]              
Disclosure of subsidiaries [line items]              
Name Of Share holders Eni SpA            
% Ownership 25.00%            
In Italy [Member] | Other significant investments Exploration Production [Member] | Subsidiaries One [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Name Of Share holders Third parties            
% Ownership 75.00%            
Outside Italy [Member] | Other significant investments Exploration Production [Member] | Subsidiaries One [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Name Of Share holders Third parties            
% Ownership 80.50%            
Outside Italy [Member] | Other significant investments Exploration Production [Member] | Subsidiaries One [Member] | Eni Venezuela BV [Member]              
Disclosure of subsidiaries [line items]              
Name Of Share holders Eni Venezuela BV            
% Ownership 19.50%            
Outside Italy [Member] | Other significant investments Exploration Production [Member] | Subsidiaries Two [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Name Of Share holders Third parties            
% Ownership 79.52%            
Outside Italy [Member] | Other significant investments Exploration Production [Member] | Subsidiaries Two [Member] | Eni Int. NA NV Sàrl [Member]              
Disclosure of subsidiaries [line items]              
Name Of Share holders Eni Int. NA NV Sàrl            
% Ownership 20.48%            
Outside Italy [Member] | Other significant investments Exploration Production [Member] | Subsidiaries Three [Member]              
Disclosure of subsidiaries [line items]              
Share capital           $ 53,006,038,189  
Outside Italy [Member] | Other significant investments Exploration Production [Member] | Subsidiaries Three [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Name Of Share holders Third partie            
% Ownership 89.01%            
Outside Italy [Member] | Other significant investments Exploration Production [Member] | Subsidiaries Three [Member] | Eni G&P LNG Aus. BV [Member]              
Disclosure of subsidiaries [line items]              
Name Of Share holders Eni G&P LNG Aus. BV            
% Ownership 10.99%            
Outside Italy [Member] | Other significant investments Exploration Production [Member] | Subsidiaries Four [Member]              
Disclosure of subsidiaries [line items]              
Share capital [2]   $ 0          
Outside Italy [Member] | Other significant investments Exploration Production [Member] | Subsidiaries Four [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Name Of Share holders Third parties            
% Ownership 82.50%            
Outside Italy [Member] | Other significant investments Exploration Production [Member] | Subsidiaries Four [Member] | Eni Oil and Gas Inc [Member]              
Disclosure of subsidiaries [line items]              
Name Of Share holders Eni Oil & Gas Inc            
% Ownership 17.50%            
Outside Italy [Member] | Other significant investments Exploration Production [Member] | Subsidiaries Five [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Name Of Share holders Third parties            
% Ownership 89.60%            
Outside Italy [Member] | Other significant investments Exploration Production [Member] | Subsidiaries Five [Member] | Eni Int. NA NV Sàrl [Member]              
Disclosure of subsidiaries [line items]              
Name Of Share holders Eni Int. NA NV Sàrl            
% Ownership 10.40%            
Outside Italy [Member] | Other significant investments Exploration Production [Member] | Subsidiaries Six [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Name Of Share holders Third parties            
% Ownership 83.19%            
Outside Italy [Member] | Other significant investments Exploration Production [Member] | Subsidiaries Six [Member] | Agip Caspian Sea BV [Member]              
Disclosure of subsidiaries [line items]              
Name Of Share holders Agip Caspian Sea BV            
% Ownership 16.81%            
Outside Italy [Member] | Other significant investments Exploration Production [Member] | Subsidiaries Seven [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Name Of Share holders Third parties            
% Ownership 86.40%            
Outside Italy [Member] | Other significant investments Exploration Production [Member] | Subsidiaries Seven [Member] | Eni Angola Prod BV [Member]              
Disclosure of subsidiaries [line items]              
Name Of Share holders Eni Angola Prod.BV            
% Ownership 13.60%            
Outside Italy [Member] | Other significant investments Exploration Production [Member] | Subsidiaries Eight [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Name Of Share holders Third parties            
% Ownership 80.50%            
Outside Italy [Member] | Other significant investments Exploration Production [Member] | Subsidiaries Eight [Member] | Eni Venezuela BV [Member]              
Disclosure of subsidiaries [line items]              
Name Of Share holders Eni Venezuela BV            
% Ownership 19.50%            
Outside Italy [Member] | Other significant investments Exploration Production [Member] | Subsidiaries Nine [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Name Of Share holders Third parties            
% Ownership 86.40%            
Outside Italy [Member] | Other significant investments Exploration Production [Member] | Subsidiaries Nine [Member] | Eni Angola Prod BV [Member]              
Disclosure of subsidiaries [line items]              
Name Of Share holders Eni Angola Prod.BV            
% Ownership 13.60%            
Outside Italy [Member] | Other significant investments Exploration Production [Member] | Subsidiaries Ten [Member] | Third parties [Member]              
Disclosure of subsidiaries [line items]              
Name Of Share holders Third parties            
% Ownership 87.50%            
Outside Italy [Member] | Other significant investments Exploration Production [Member] | Subsidiaries Ten [Member] | Ieoc Production BV [Member]              
Disclosure of subsidiaries [line items]              
Name Of Share holders Ieoc Production BV            
% Ownership 12.50%            
[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.