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Other information about investments - Other significant investments - Refining & Marketing and Chemical & Corporate and other activities (Details)
 12 Months Ended
Dec. 31, 2022
GBP (£)
Dec. 31, 2022
EUR (€)
Dec. 31, 2022
CHF (SFr)
Dec. 31, 2022
GHS (GH₵)
Dec. 31, 2022
SAR (ر.س)
Dec. 31, 2021
EUR (€)
Other significant investments            
Share capital   € 4,005,000,000       € 4,005,000,000
ENI SpA            
Other significant investments            
Share capital   4,005,358,876       € 4,005,358,876
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Two [Member]            
Other significant investments            
Company name BFS Berlin Fuelling Services GbR          
Registered office Berlin (Germany)          
Country of operation Germany          
Share capital   89,199        
Consolidation or valuation method F.V.          
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Two [Member] | Eni Deutsch.GmbH            
Other significant investments            
% Ownership 12.50%          
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Two [Member] | Third parties            
Other significant investments            
% Ownership 87.50%          
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Three [Member]            
Other significant investments            
Company name Compania de Economia Mixta "Austrogas"          
Registered office Cuenca (Ecuador)          
Country of operation Ecuador          
Share capital   6,863,493        
Consolidation or valuation method F.V.          
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Three [Member] | Eni Ecuador SA            
Other significant investments            
% Ownership 13.38%          
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Three [Member] | Third parties            
Other significant investments            
% Ownership 86.62%          
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Four [Member]            
Other significant investments            
Company name Dépôt Pétrolier de la Côte d’Azur SAS          
Registered office Nanterre (France)          
Country of operation France          
Share capital   207,500        
Consolidation or valuation method F.V.          
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Four [Member] | Eni France Sarl            
Other significant investments            
% Ownership 18.00%          
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Four [Member] | Third parties            
Other significant investments            
% Ownership 82.00%          
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Five [Member]            
Other significant investments            
Company name Dépôts Pétroliers de Fos SA          
Registered office Fos-Sur-Mer (France)          
Country of operation France          
Share capital   3,954,196.4        
Consolidation or valuation method F.V.          
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Five [Member] | Eni France Sarl            
Other significant investments            
% Ownership 16.81%          
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Five [Member] | Third parties            
Other significant investments            
% Ownership 83.19%          
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Six [Member]            
Other significant investments            
Company name Joint Inspection Group Ltd          
Registered office Cambourne (United Kingdom)          
Country of operation United Kingdom          
Share capital | £ £ 0          
Consolidation or valuation method F.V.          
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Six [Member] | ENI SpA            
Other significant investments            
% Ownership 12.50%          
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Six [Member] | Third parties            
Other significant investments            
% Ownership 87.50%          
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Seven [Member]            
Other significant investments            
Company name Saudi European Petrochemical Co "IBN ZAHR"          
Registered office Al Jubail (Saudi Arabia)          
Country of operation Saudi Arabia          
Share capital | ر.س         ر.س 1,200,000,000  
Consolidation or valuation method F.V.          
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Seven [Member] | Ecofuel SpA            
Other significant investments            
% Ownership 10.00%          
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Seven [Member] | Third parties            
Other significant investments            
% Ownership 90.00%          
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Eight [Member]            
Other significant investments            
Company name S.I.P.G. Société Immobilière Pétrolière de Gestion Snc          
Registered office Tremblay-en- France (France)          
Country of operation France          
Share capital   40,000        
Consolidation or valuation method F.V.          
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Eight [Member] | Eni France Sarl            
Other significant investments            
% Ownership 12.50%          
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Eight [Member] | Third parties            
Other significant investments            
% Ownership 87.50%          
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Nine [Member]            
Other significant investments            
Company name Sistema Integrado de Gestion de Aceites Usados          
Registered office Madrid (Spain)          
Country of operation Spain          
Share capital   175,713        
Consolidation or valuation method F.V.          
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Nine [Member] | Eni Iberia SLU            
Other significant investments            
% Ownership 15.45%          
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Nine [Member] | Third parties            
Other significant investments            
% Ownership 84.55%          
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Ten [Member]            
Other significant investments            
Company name Tanklager Gesellschaft Tegel (TGT) GbR          
Registered office Hamburg (Germany)          
Country of operation Germany          
Share capital   4,953        
Consolidation or valuation method F.V.          
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Ten [Member] | Eni Deutsch.GmbH            
Other significant investments            
% Ownership 12.50%          
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Ten [Member] | Third parties            
Other significant investments            
% Ownership 87.50%          
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Eleven [Member]            
Other significant investments            
Company name TAR - Tankanlage Ruemlang AG          
Registered office Ruemlang (Switzerland)          
Country of operation Switzerland          
Share capital | SFr     SFr 3,259,500      
Consolidation or valuation method F.V.          
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Eleven [Member] | Eni Suisse SA            
Other significant investments            
% Ownership 16.27%          
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Eleven [Member] | Third parties            
Other significant investments            
% Ownership 83.73%          
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Twelve [Member]            
Other significant investments            
Company name Tema Lube Oil Co Ltd          
Registered office Accra (Ghana)          
Country of operation Ghana          
Share capital | GH₵       GH₵ 258,309    
Consolidation or valuation method F.V.          
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Twelve [Member] | Eni International BV            
Other significant investments            
% Ownership 12.00%          
Refining & Marketing | Foreign (outside Italy) | Other Significant Investments Twelve [Member] | Third parties            
Other significant investments            
% Ownership 88.00%          
Corporate and financial companies | Foreign (outside Italy) | Other significant investments One [member]            
Other significant investments            
Company name New Energy One Acquisition Corporation Plc (#)          
Registered office London (United Kingdom)          
Country of operation United Kingdom          
Share capital | £ £ 71,875          
Consolidation or valuation method F.V.          
Corporate and financial companies | Foreign (outside Italy) | Other significant investments One [member] | Eni International BV            
Other significant investments            
% Ownership 3.92%          
Corporate and financial companies | Foreign (outside Italy) | Other significant investments One [member] | Third parties            
Other significant investments            
% Ownership 96.08%          
Other activities | Italy | Other significant investments One [member]            
Other significant investments            
Company name Ottana Sviluppo ScpA (in bankruptcy)          
Registered office Nuoro          
Country of operation Italy          
Share capital   € 516,000        
Consolidation or valuation method F.V.          
Other activities | Italy | Other significant investments One [member] | Eni Rewind SpA            
Other significant investments            
% Ownership 30.00%          
Other activities | Italy | Other significant investments One [member] | Third parties            
Other significant investments            
% Ownership 70.00%