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Other information about investments - Subsidiaries - Corporate and other activities (Details)
 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2021
EUR (€)
Dec. 31, 2021
GBP (£)
Dec. 31, 2021
EGP (ج.م.)
Dec. 31, 2021
CHF (SFr)
Dec. 31, 2020
EUR (€)
Subsidiaries            
Share capital   € 4,005,000,000       € 4,005,000,000
ENI SpA            
Subsidiaries            
Share capital   4,005,358,876       € 4,005,358,876
Corporate and financial companies | Italy | Subsidiaries One [Member]            
Subsidiaries            
Company name Agenzia Giornalistica Italia SpA          
Registered office Rome          
Country of operation Italy          
Share capital   2,000,000        
% Equity ratio 100.00%          
Consolidation or valuation method F.C.          
Corporate and financial companies | Italy | Subsidiaries One [Member] | ENI SpA            
Subsidiaries            
% Ownership 100.00%          
Corporate and financial companies | Italy | Subsidiaries Two [Member]            
Subsidiaries            
Company name D-Service Media Srl (in liquidation)          
Registered office Milan          
Country of operation Italy          
Share capital   75,000        
Consolidation or valuation method Eq.          
Corporate and financial companies | Italy | Subsidiaries Two [Member] | D-Share SpA            
Subsidiaries            
% Ownership 100.00%          
Corporate and financial companies | Italy | Subsidiaries Three [Member]            
Subsidiaries            
Company name D-Share SpA          
Registered office Milan          
Country of operation Italy          
Share capital   121,719.25        
% Equity ratio 100.00%          
Consolidation or valuation method F.C.          
Corporate and financial companies | Italy | Subsidiaries Three [Member] | AGI SpA            
Subsidiaries            
% Ownership 100.00%          
Corporate and financial companies | Italy | Subsidiaries Four [Member]            
Subsidiaries            
Company name Eni Corporate University SpA          
Registered office San Donato Milanese (MI)          
Country of operation Italy          
Share capital   3,360,000        
% Equity ratio 100.00%          
Consolidation or valuation method F.C.          
Corporate and financial companies | Italy | Subsidiaries Four [Member] | ENI SpA            
Subsidiaries            
% Ownership 100.00%          
Corporate and financial companies | Italy | Subsidiaries Five [Member]            
Subsidiaries            
Company name Eni Energia Italia Srl          
Registered office San Donato Milanese (MI)          
Country of operation Italy          
Share capital   50,000        
Consolidation or valuation method Co.          
Corporate and financial companies | Italy | Subsidiaries Five [Member] | ENI SpA            
Subsidiaries            
% Ownership 100.00%          
Corporate and financial companies | Italy | Subsidiaries Six [Member]            
Subsidiaries            
Company name Eni Nuova Energia Srl          
Registered office San Donato Milanese (MI)          
Country of operation Italy          
Share capital   50,000        
Consolidation or valuation method Co.          
Corporate and financial companies | Italy | Subsidiaries Six [Member] | ENI SpA            
Subsidiaries            
% Ownership 100.00%          
Corporate and financial companies | Italy | Subsidiaries Seven [Member]            
Subsidiaries            
Company name Eni Trading & Shipping SpA (in liquidation)          
Registered office Rome          
Country of operation Italy          
Share capital   334,171        
Consolidation or valuation method Co.          
Corporate and financial companies | Italy | Subsidiaries Seven [Member] | ENI SpA            
Subsidiaries            
% Ownership 100.00%          
Corporate and financial companies | Italy | Subsidiaries Eight [Member]            
Subsidiaries            
Company name EniProgetti SpA          
Registered office Venezia Marghera (VE)          
Country of operation Italy          
Share capital   2,064,000        
% Equity ratio 100.00%          
Consolidation or valuation method F.C.          
Corporate and financial companies | Italy | Subsidiaries Eight [Member] | ENI SpA            
Subsidiaries            
% Ownership 100.00%          
Corporate and financial companies | Italy | Subsidiaries Nine [Member]            
Subsidiaries            
Company name EniServizi SpA          
Registered office San Donato Milanese (MI)          
Country of operation Italy          
Share capital   13,427,419.08        
% Equity ratio 100.00%          
Consolidation or valuation method F.C.          
Corporate and financial companies | Italy | Subsidiaries Nine [Member] | ENI SpA            
Subsidiaries            
% Ownership 100.00%          
Corporate and financial companies | Italy | Subsidiaries Ten [Member]            
Subsidiaries            
Company name Serfactoring SpA          
Registered office San Donato Milanese (MI)          
Country of operation Italy          
Share capital   5,160,000        
% Equity ratio 100.00%          
Consolidation or valuation method F.C.          
Corporate and financial companies | Italy | Subsidiaries Ten [Member] | ENI SpA            
Subsidiaries            
% Ownership 100.00%          
Corporate and financial companies | Italy | Subsidiaries Eleven [Member]            
Subsidiaries            
Company name Servizi Aerei SpA          
Registered office San Donato Milanese (MI)          
Country of operation Italy          
Share capital   48,205,536        
% Equity ratio 100.00%          
Consolidation or valuation method F.C.          
Corporate and financial companies | Italy | Subsidiaries Eleven [Member] | ENI SpA            
Subsidiaries            
% Ownership 100.00%          
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Twelve [Member]            
Subsidiaries            
Company name Banque Eni SA          
Registered office Bruxelles (Belgium)          
Country of operation Belgium          
Share capital   50,000,000        
% Equity ratio 100.00%          
Consolidation or valuation method F.C.          
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Twelve [Member] | Eni International BV            
Subsidiaries            
% Ownership 99.90%          
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Twelve [Member] | Eni Oil Holdings BV            
Subsidiaries            
% Ownership 0.10%          
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Thirteen [Member]            
Subsidiaries            
Company name D-Share USA Corp.          
Registered office New York (USA)          
Country of operation USA          
Share capital | $ $ 0          
Consolidation or valuation method Co.          
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Thirteen [Member] | D-Share SpA            
Subsidiaries            
% Ownership 100.00%          
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Fourteen [Member]            
Subsidiaries            
Company name Eni Finance International SA          
Registered office Bruxelles (Belgium)          
Country of operation Belgium          
Share capital | $ $ 1,480,365,336          
% Equity ratio 100.00%          
Consolidation or valuation method F.C.          
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Fourteen [Member] | ENI SpA            
Subsidiaries            
% Ownership 33.61%          
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Fourteen [Member] | Eni International BV            
Subsidiaries            
% Ownership 66.39%          
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Fifteen [Member]            
Subsidiaries            
Company name Eni Finance USA Inc          
Registered office Dover (USA)          
Country of operation USA          
Share capital | $ $ 15,000,000          
% Equity ratio 100.00%          
Consolidation or valuation method F.C.          
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Fifteen [Member] | Eni Petroleum Co Inc            
Subsidiaries            
% Ownership 100.00%          
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Sixteen [Member]            
Subsidiaries            
Company name Eni Insurance DAC          
Registered office Dublin (Ireland)          
Country of operation Ireland          
Share capital   500,000,000        
% Equity ratio 100.00%          
Consolidation or valuation method F.C.          
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Sixteen [Member] | ENI SpA            
Subsidiaries            
% Ownership 100.00%          
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Seventeen [Member]            
Subsidiaries            
Company name Eni International BV          
Registered office Amsterdam (Netherlands)          
Country of operation Netherlands          
Share capital   641,683,425        
% Equity ratio 100.00%          
Consolidation or valuation method F.C.          
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Seventeen [Member] | ENI SpA            
Subsidiaries            
% Ownership 100.00%          
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Eighteen [Member]            
Subsidiaries            
Company name Eni International Resources Ltd          
Registered office London (United Kingdom)          
Country of operation United Kingdom          
Share capital | £     £ 50,000      
% Equity ratio 100.00%          
Consolidation or valuation method F.C.          
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Eighteen [Member] | ENI SpA            
Subsidiaries            
% Ownership 99.99%          
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Nineteen [Member]            
Subsidiaries            
Company name Eni Next Llc          
Registered office Dover (USA)          
Country of operation USA          
Share capital | $ $ 100          
% Equity ratio 100.00%          
Consolidation or valuation method F.C.          
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Nineteen [Member] | Eni Petroleum Co Inc            
Subsidiaries            
% Ownership 100.00%          
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Twenty [Member]            
Subsidiaries            
Company name EniProgetti Egypt Ltd          
Registered office Cairo (Egypt)          
Country of operation Egypt          
Share capital | ج.م.       ج.م. 50,000    
Consolidation or valuation method Eq.          
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Twenty [Member] | ENI SpA            
Subsidiaries            
% Ownership 1.00%          
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Twenty [Member] | EniProgetti SpA            
Subsidiaries            
% Ownership 99.00%          
Other activities | Italy | Subsidiaries One [Member]            
Subsidiaries            
Company name Eni Rewind SpA          
Registered office San Donato Milanese (MI)          
Country of operation Italy          
Share capital   281,857,871.44        
% Equity ratio 100.00%          
Consolidation or valuation method F.C.          
Other activities | Italy | Subsidiaries One [Member] | ENI SpA            
Subsidiaries            
% Ownership 99.99%          
Other activities | Italy | Subsidiaries Two [Member]            
Subsidiaries            
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 valuation method Eq.          
Other activities | Italy | Subsidiaries Two [Member] | Eni Rewind SpA            
Subsidiaries            
% Ownership 52.00%          
Other activities | Italy | Subsidiaries Two [Member] | Third parties            
Subsidiaries            
% Ownership 48.00%          
Other activities | Italy | Subsidiaries Three [Member]            
Subsidiaries            
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 valuation method F.C.          
Other activities | Italy | Subsidiaries Three [Member] | Eni Rewind SpA            
Subsidiaries            
% Ownership 100.00%          
Other activities | Foreign (outside Italy) | Subsidiaries Four [Member]            
Subsidiaries            
Company name Eni Rewind International BV          
Registered office Amsterdam (Netherlands)          
Country of operation Netherlands          
Share capital   € 20,000        
Consolidation or valuation method Eq.          
Other activities | Foreign (outside Italy) | Subsidiaries Four [Member] | Eni International BV            
Subsidiaries            
% Ownership 100.00%          
Other activities | Foreign (outside Italy) | Subsidiaries Five [Member]            
Subsidiaries            
Company name Oleodotto del Reno SA          
Registered office Coira (Switzerland)          
Country of operation Switzerland          
Share capital | SFr         SFr 1,550,000  
Consolidation or valuation method Eq.          
Other activities | Foreign (outside Italy) | Subsidiaries Five [Member] | Eni Rewind SpA            
Subsidiaries            
% Ownership 100.00%