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Other information about investments (Details 8)
 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 detailed information about investment property [line items]              
Share capital € 4,005,000,000           € 4,005,000,000
In Italy [Member] | Other Activities [Member] | Subsidiaries One [Member]              
Disclosure of detailed information about investment property [line items]              
Company name Filatura Tessile Nazionale Italiana - FILTENI SpA (in liquidation)            
Registered office Ferrandina (MT)            
Country of operation Italy            
Share capital € 4,644,000            
Consolidation or valutation method [1] Co.            
In Italy [Member] | Other Activities [Member] | Subsidiaries One [Member] | Third parties [Member]              
Disclosure of detailed information about investment property [line items]              
Name Of Share holders Third parties            
% Ownership 40.44%            
In Italy [Member] | Other Activities [Member] | Subsidiaries One [Member] | Syndial SpA [Member]              
Disclosure of detailed information about investment property [line items]              
Name Of Share holders Syndial SpA            
% Ownership [2] 59.56%            
In Italy [Member] | Other Activities [Member] | Subsidiaries Two [Member]              
Disclosure of detailed information about investment property [line items]              
Company name Ottana Sviluppo ScpA (in liquidation)            
Registered office Nuoro            
Country of operation Italy            
Share capital € 516,000            
Consolidation or valutation method [1] Eq.            
In Italy [Member] | Other Activities [Member] | Subsidiaries Two [Member] | Third parties [Member]              
Disclosure of detailed information about investment property [line items]              
Name Of Share holders Third parties            
% Ownership 70.00%            
In Italy [Member] | Other Activities [Member] | Subsidiaries Two [Member] | Syndial SpA [Member]              
Disclosure of detailed information about investment property [line items]              
Name Of Share holders Syndial SpA            
% Ownership 30.00%            
In Italy [Member] | Other Activities [Member] | Subsidiaries Two [Member] | ENI SPA [Member]              
Disclosure of detailed information about investment property [line items]              
Name Of Share holders Eni SpA            
In Italy [Member] | Other Activities [Member] | Subsidiaries Three [Member]              
Disclosure of detailed information about investment property [line items]              
Company name [3],[4] Saipem SpA            
Registered office San Donato  Milanese (MI)            
Country of operation Italy            
Share capital € 2,191,384,693            
Consolidation or valutation method [1] Eq.            
In Italy [Member] | Other Activities [Member] | Subsidiaries Three [Member] | Third parties [Member]              
Disclosure of detailed information about investment property [line items]              
Name Of Share holders Third parties            
% Ownership 68.00%            
In Italy [Member] | Other Activities [Member] | Subsidiaries Three [Member] | ENI SPA [Member]              
Disclosure of detailed information about investment property [line items]              
Name Of Share holders Eni SpA            
% Ownership 30.54%            
In Italy [Member] | Other Activities [Member] | Subsidiaries Three [Member] | Saipem SpA [Member]              
Disclosure of detailed information about investment property [line items]              
Name Of Share holders Saipem SpA            
% Ownership [2] 1.46%            
Outside Italy [Member] | Other Activities [Member] | Subsidiaries One [Member]              
Disclosure of detailed information about investment property [line items]              
Company name [4] Grid Edge (Private) Ltd            
Registered office Saddar Town- Karachi (Pakistan)            
Country of operation Pakistan            
Share capital         ₨ 1,200,000 ₸ 2,133,967,100  
Consolidation or valutation method [1] Eq.            
Outside Italy [Member] | Other Activities [Member] | Subsidiaries One [Member] | Third parties [Member]              
Disclosure of detailed information about investment property [line items]              
Name Of Share holders Third parties            
% Ownership 60.00%            
Outside Italy [Member] | Other Activities [Member] | Subsidiaries One [Member] | Eni International BV [Member]              
Disclosure of detailed information about investment property [line items]              
Name Of Share holders Eni International BV            
% Ownership 40.00%            
Outside Italy [Member] | Other Activities [Member] | Subsidiaries Two [Member]              
Disclosure of detailed information about investment property [line items]              
Registered office Cairo  (Egypt)            
Share capital | ج.م.       ج.م. 250,000      
Outside Italy [Member] | Other Activities [Member] | Subsidiaries Two [Member] | Eni International BV [Member]              
Disclosure of detailed information about investment property [line items]              
Name Of Share holders Eni International BV            
Outside Italy [Member] | Other Activities [Member] | Subsidiaries Three [Member]              
Disclosure of detailed information about investment property [line items]              
Registered office Coira  (Switzerland)            
Share capital | SFr     SFr 1,550,000        
Outside Italy [Member] | Other Activities [Member] | Subsidiaries Three [Member] | Syndial SpA [Member]              
Disclosure of detailed information about investment property [line items]              
Name Of Share holders Syndial SpA            
Outside Italy [Member] | Corporate And Other Activities [Member] | Subsidiaries One [Member]              
Disclosure of detailed information about investment property [line items]              
Company name Commonwealth Fusion Systems Llc            
Registered office Wilmington  (USA)            
Country of operation USA            
Share capital | $   $ 148,291,710.38          
Consolidation or valutation method [1] P.N.            
Outside Italy [Member] | Corporate And Other Activities [Member] | Subsidiaries One [Member] | Eni Next Llc [Member]              
Disclosure of detailed information about investment property [line items]              
Name Of Share holders Eni Next Llc            
% Ownership 35.72%            
Outside Italy [Member] | Corporate And Other Activities [Member] | Subsidiaries One [Member] | Third parties [Member]              
Disclosure of detailed information about investment property [line items]              
Name Of Share holders Third parties            
% Ownership 66.28%            
[1] F.C. = full consolidation, J.O. = joint operation, Eq. = equity-accounted, Co. = valued at cost, F.V. = valued at fair value
[2] Controlling interest:
[3] Company with shares quoted in the regulated market of Italy or of other EU countries
[4] Jointly controlled entity.