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Other information about investments (Details 12)
 12 Months Ended
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
GBP (£)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
AUD ($)
Dec. 31, 2017
EGP (ج.م.)
Dec. 31, 2017
VEF ( )
Dec. 31, 2017
AOA (Kz)
Dec. 31, 2016
EUR (€)
Disclosure of subsidiaries [line items]                
Share capital | € € 4,005,000,000             € 4,005,000,000
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              
Method used to account for investments in subsidiaries [1] Co.              
Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries One [Member] | Eni SpA [Member]                
Disclosure of subsidiaries [line items]                
Name of Shareholders Eni SpA              
% Ownership 20.00%              
Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries One [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Name of Shareholders Third parties              
% Ownership 80.00%              
Outside Italy [Member] | 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 |           100    
Method used to account for investments in subsidiaries [1] Co.              
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries One [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Name of Shareholders 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 Shareholders Eni Venezuela BV              
% Ownership 19.50%              
Outside Italy [Member] | 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          
Method used to account for investments in subsidiaries [1] Co.              
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Two [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Name of Shareholders Third parties              
% Ownership 79.52%              
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Two [Member] | Eni Int. NA NV Sarl [Member]                
Disclosure of subsidiaries [line items]                
Name of Shareholders 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]                
Company name Darwin LNG Pty Ltd              
Registered office West Perth (Australia)              
Country of operation Australia              
Share capital       $ 692,507,924.87        
Method used to account for investments in subsidiaries [1] Co.              
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Three [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Name of Shareholders Third parties              
% 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 Shareholders 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]                
Company name New Liberty Residential Co Llc              
Registered office West Trenton (USA)              
Country of operation USA              
Share capital [2]     0          
Method used to account for investments in subsidiaries [1] Co.              
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Four [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Name of Shareholders Third parties              
% Ownership 82.50%              
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Four [Member] | Eni Oil & Gas Inc [Member]                
Disclosure of subsidiaries [line items]                
Name of Shareholders Eni Oil & Gas Inc              
% Ownership 17.50%              
Outside Italy [Member] | 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          
Method used to account for investments in subsidiaries [1] Co.              
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Five [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Name of Shareholders Third parties              
% Ownership 89.60%              
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Five [Member] | Eni Int. NA NV Sarl [Member]                
Disclosure of subsidiaries [line items]                
Name of Shareholders Eni Int. NA NV Sàrl              
% Ownership 10.40%              
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Six [Member]                
Disclosure of subsidiaries [line items]                
Company name Norsea Pipeline Ltd              
Registered office Woking Surrey (United Kingdom)              
Country of operation United Kingdom              
Share capital | £   £ 7,614,062            
Method used to account for investments in subsidiaries [1] Co.              
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Six [Member] | Eni SpA [Member]                
Disclosure of subsidiaries [line items]                
Name of Shareholders Eni SpA              
% Ownership 10.32%              
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Six [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Name of Shareholders Third parties              
% Ownership 89.68%              
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Seven [Member]                
Disclosure of subsidiaries [line items]                
Company name North Caspian Operating Co NV              
Registered office Amsterdam (Netherlands)              
Country of operation Kazakhstan              
Share capital | € € 128,520              
Method used to account for investments in subsidiaries [1] Co.              
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Seven [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Name of Shareholders Third parties              
% Ownership 83.19%              
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Seven [Member] | Agip Caspian Sea BV [Member]                
Disclosure of subsidiaries [line items]                
Name of Shareholders Agip Caspian Sea BV              
% Ownership 16.81%              
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Eight [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  
Method used to account for investments in subsidiaries [1] Co.              
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Eight [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Name of Shareholders Third parties              
% Ownership 86.40%              
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Eight [Member] | Eni Angola Prod.BV [Member]                
Disclosure of subsidiaries [line items]                
Name of Shareholders Eni Angola Prod.BV              
% Ownership 13.60%              
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Nine [Member]                
Disclosure of subsidiaries [line items]                
Company name Petrolera Güiria SA              
Registered office Caracas (Venezuela)              
Country of operation Venezuela              
Share capital |           1,000,000    
Method used to account for investments in subsidiaries [1] Co.              
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Nine [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Name of Shareholders Third parties              
% Ownership 80.50%              
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Nine [Member] | Eni Venezuela BV [Member]                
Disclosure of subsidiaries [line items]                
Name of Shareholders Eni Venezuela BV              
% Ownership 19.50%              
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Ten [Member]                
Disclosure of subsidiaries [line items]                
Company name Point Fortin LNG Exports Ltd              
Registered office Port of Spain (Trinidad and Tobago)              
Country of operation Trinidad and Tobago              
Share capital     $ 10,000          
Method used to account for investments in subsidiaries [1] Co.              
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Ten [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Name of Shareholders Third parties              
% Ownership 82.69%              
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Ten [Member] | Eni T&T Ltd [Member]                
Disclosure of subsidiaries [line items]                
Name of Shareholders Eni T&T Ltd              
% Ownership 17.31%              
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Eleven [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  
Method used to account for investments in subsidiaries [1] Co.              
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Eleven [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Name of Shareholders Third parties              
% Ownership 86.40%              
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Eleven [Member] | Eni Angola Prod.BV [Member]                
Disclosure of subsidiaries [line items]                
Name of Shareholders Eni Angola Prod.BV              
% Ownership 13.60%              
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Twelve [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      
Method used to account for investments in subsidiaries [1] Co.              
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Twelve [Member] | Third parties [Member]                
Disclosure of subsidiaries [line items]                
Name of Shareholders Third parties              
% Ownership 87.50%              
Outside Italy [Member] | Other significant investments Exploration & Production [Member] | Subsidiaries Twelve [Member] | Ieoc Production BV [Member]                
Disclosure of subsidiaries [line items]                
Name of Shareholders Ieoc Production BV              
% Ownership 12.50%              
[1] Jointly controlled entity.
[2] Shares without nominal value.