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Other information about investments - Joint arrangements and associates - Plenitude & Power (Details)
 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2021
EUR (€)
Dec. 31, 2021
GBP (£)
Dec. 31, 2021
NOK (kr)
Dec. 31, 2020
EUR (€)
Joint arrangements and associates          
Share capital   € 4,005,000,000     € 4,005,000,000
ENI SpA          
Joint arrangements and associates          
Share capital   4,005,358,876     € 4,005,358,876
Plenitude | Italy | Joint Arrangement Or Associate One [Member]          
Joint arrangements and associates          
Company name E-Prosume Srl (†)        
Registered office Milan        
Country of operation Italy        
Share capital   100,000      
Consolidation or valuation method Eq.        
Plenitude | Italy | Joint Arrangement Or Associate One [Member] | Evolvere Venture Spa          
Joint arrangements and associates          
% Ownership 50.00%        
Plenitude | Italy | Joint Arrangement Or Associate One [Member] | Third parties          
Joint arrangements and associates          
% Ownership 50.00%        
Plenitude | Italy | Joint Arrangement Or Associate Two [Member]          
Joint arrangements and associates          
Company name Evogy Srl Società Benefit        
Registered office Seriate (BG)        
Country of operation Italy        
Share capital   11,785.71      
Consolidation or valuation method Eq.        
Plenitude | Italy | Joint Arrangement Or Associate Two [Member] | Evolvere Venture Spa          
Joint arrangements and associates          
% Ownership 45.45%        
Plenitude | Italy | Joint Arrangement Or Associate Two [Member] | Third parties          
Joint arrangements and associates          
% Ownership 54.55%        
Plenitude | Italy | Joint Arrangement Or Associate Three [Member]          
Joint arrangements and associates          
Company name GreenIT SpA (†)        
Registered office San Donato Milanese (MI)        
Country of operation Italy        
Share capital   50,000      
Consolidation or valuation method Eq.        
Plenitude | Italy | Joint Arrangement Or Associate Three [Member] | Eni gas e luce SpA SB          
Joint arrangements and associates          
% Ownership 51.00%        
Plenitude | Italy | Joint Arrangement Or Associate Three [Member] | Third parties          
Joint arrangements and associates          
% Ownership 49.00%        
Plenitude | Italy | Joint Arrangement Or Associate Four [Member]          
Joint arrangements and associates          
Company name Renewable Dispatching Srl        
Registered office Milan        
Country of operation Italy        
Share capital   200,000      
Consolidation or valuation method Eq.        
Plenitude | Italy | Joint Arrangement Or Associate Four [Member] | Evolvere Venture Spa          
Joint arrangements and associates          
% Ownership 40.00%        
Plenitude | Italy | Joint Arrangement Or Associate Four [Member] | Third parties          
Joint arrangements and associates          
% Ownership 60.00%        
Plenitude | Italy | Joint Arrangement Or Associate Five [Member]          
Joint arrangements and associates          
Company name Tate Srl        
Registered office Bologna        
Country of operation Italy        
Share capital   408,509.29      
Consolidation or valuation method Eq.        
Plenitude | Italy | Joint Arrangement Or Associate Five [Member] | Evolvere Venture Spa          
Joint arrangements and associates          
% Ownership 36.00%        
Plenitude | Italy | Joint Arrangement Or Associate Five [Member] | Third parties          
Joint arrangements and associates          
% Ownership 64.00%        
Plenitude | Foreign (outside Italy) | Joint Arrangement Or Associate Eight [Member]          
Joint arrangements and associates          
Company name Bluebell Solar Class A Holdings II Llc        
Registered office Wilmington (USA)        
Country of operation USA        
Share capital | $ $ 82,351,634        
Consolidation or valuation method Eq.        
Plenitude | Foreign (outside Italy) | Joint Arrangement Or Associate Eight [Member] | Eni New Energy US Inc          
Joint arrangements and associates          
% Ownership 99.00%        
Plenitude | Foreign (outside Italy) | Joint Arrangement Or Associate Eight [Member] | Third parties          
Joint arrangements and associates          
% Ownership 1.00%        
Plenitude | Foreign (outside Italy) | Joint Arrangement Or Associate Nine [Member]          
Joint arrangements and associates          
Company name Clarensac Solar SAS        
Registered office Meyreuil (France)        
Country of operation France        
Share capital   25,000      
Consolidation or valuation method Eq.        
Plenitude | Foreign (outside Italy) | Joint Arrangement Or Associate Nine [Member] | Dhamma Energy SAS          
Joint arrangements and associates          
% Ownership 40.00%        
Plenitude | Foreign (outside Italy) | Joint Arrangement Or Associate Nine [Member] | Third parties          
Joint arrangements and associates          
% Ownership 60.00%        
Plenitude | Foreign (outside Italy) | Joint Arrangement Or Associate Ten [Member]          
Joint arrangements and associates          
Company name Doggerbank Offshore Wind Farm Project 1 Holdco Ltd (†)        
Registered office Reading (United Kingdom)        
Country of operation United Kingdom        
Share capital | £     £ 1,000    
Consolidation or valuation method Eq.        
Plenitude | Foreign (outside Italy) | Joint Arrangement Or Associate Ten [Member] | Eni North Sea Wind          
Joint arrangements and associates          
% Ownership 20.00%        
Plenitude | Foreign (outside Italy) | Joint Arrangement Or Associate Ten [Member] | Third parties          
Joint arrangements and associates          
% Ownership 80.00%        
Plenitude | Foreign (outside Italy) | Joint Arrangement Or Associate Eleven [Member]          
Joint arrangements and associates          
Company name Doggerbank Offshore Wind Farm Project 2 Holdco Ltd (†)        
Registered office Reading (United Kingdom)        
Country of operation United Kingdom        
Share capital | £     £ 1,000    
Consolidation or valuation method Eq.        
Plenitude | Foreign (outside Italy) | Joint Arrangement Or Associate Eleven [Member] | Eni North Sea Wind          
Joint arrangements and associates          
% Ownership 20.00%        
Plenitude | Foreign (outside Italy) | Joint Arrangement Or Associate Eleven [Member] | Third parties          
Joint arrangements and associates          
% Ownership 80.00%        
Plenitude | Foreign (outside Italy) | Joint Arrangement Or Associate Twelve [Member]          
Joint arrangements and associates          
Company name Enera Conseil SAS(†)        
Registered office Clichy (France)        
Country of operation France        
Share capital   9,690      
Consolidation or valuation method Eq.        
Plenitude | Foreign (outside Italy) | Joint Arrangement Or Associate Twelve [Member] | Eni G&P France SA          
Joint arrangements and associates          
% Ownership 51.00%        
Plenitude | Foreign (outside Italy) | Joint Arrangement Or Associate Twelve [Member] | Third parties          
Joint arrangements and associates          
% Ownership 49.00%        
Plenitude | Foreign (outside Italy) | Joint Arrangement Or Associate Thirteen [Member]          
Joint arrangements and associates          
Company name Fotovoltaica Escudero SL        
Registered office Valencia (Spain)        
Country of operation Spain        
Share capital   3,000      
Consolidation or valuation method Eq.        
Plenitude | Foreign (outside Italy) | Joint Arrangement Or Associate Thirteen [Member] | Dhamma Energy Group          
Joint arrangements and associates          
% Ownership 45.00%        
Plenitude | Foreign (outside Italy) | Joint Arrangement Or Associate Thirteen [Member] | Third parties          
Joint arrangements and associates          
% Ownership 55.00%        
Plenitude | Foreign (outside Italy) | Joint Arrangement Or Associate Fourteen [Member]          
Joint arrangements and associates          
Company name Gas Distribution Company of Thessaloniki - Thessaly SA (†)        
Registered office Ampelokipi-Menemeni (Greece)        
Country of operation Greece        
Share capital   247,127,605      
Consolidation or valuation method Co.        
Plenitude | Foreign (outside Italy) | Joint Arrangement Or Associate Fourteen [Member] | Eni gas e luce SpA SB          
Joint arrangements and associates          
% Ownership 49.00%        
Plenitude | Foreign (outside Italy) | Joint Arrangement Or Associate Fourteen [Member] | Third parties          
Joint arrangements and associates          
% Ownership 51.00%        
Plenitude | Foreign (outside Italy) | Joint Arrangement Or Associate Fifteen [Member]          
Joint arrangements and associates          
Company name Novis Renewables Holdings Llc        
Registered office Wilmington (USA)        
Country of operation USA        
Share capital | $ $ 100        
Consolidation or valuation method Eq.        
Plenitude | Foreign (outside Italy) | Joint Arrangement Or Associate Fifteen [Member] | Eni New Energy US Inc          
Joint arrangements and associates          
% Ownership 49.00%        
Plenitude | Foreign (outside Italy) | Joint Arrangement Or Associate Fifteen [Member] | Third parties          
Joint arrangements and associates          
% Ownership 51.00%        
Plenitude | Foreign (outside Italy) | Joint Arrangement Or Associate Sixteen [Member]          
Joint arrangements and associates          
Company name Novis Renewables Llc (†)        
Registered office Wilmington (USA)        
Country of operation USA        
Share capital | $ $ 100        
Consolidation or valuation method Eq.        
Plenitude | Foreign (outside Italy) | Joint Arrangement Or Associate Sixteen [Member] | Eni New Energy US Inc          
Joint arrangements and associates          
% Ownership 50.00%        
Plenitude | Foreign (outside Italy) | Joint Arrangement Or Associate Sixteen [Member] | Third parties          
Joint arrangements and associates          
% Ownership 50.00%        
Plenitude | Foreign (outside Italy) | Joint Arrangement Or Associate Seven teen [Member]          
Joint arrangements and associates          
Company name OVO Energy (France) SAS        
Registered office Paris (France)        
Country of operation France        
Share capital   66,666.66      
Consolidation or valuation method Eq.        
Plenitude | Foreign (outside Italy) | Joint Arrangement Or Associate Seven teen [Member] | Eni gas e luce SpA SB          
Joint arrangements and associates          
% Ownership 25.00%        
Plenitude | Foreign (outside Italy) | Joint Arrangement Or Associate Seven teen [Member] | Third parties          
Joint arrangements and associates          
% Ownership 75.00%        
Plenitude | Foreign (outside Italy) | Joint Arrangement Or Associate Eight teen [Member]          
Joint arrangements and associates          
Company name Vårgrønn AS (†)        
Registered office Stavanger (Norway)        
Country of operation Norway        
Share capital | kr       kr 100,000  
Consolidation or valuation method Eq.        
Plenitude | Foreign (outside Italy) | Joint Arrangement Or Associate Eight teen [Member] | Eni Energy Solutions BV          
Joint arrangements and associates          
% Ownership 69.60%        
Plenitude | Foreign (outside Italy) | Joint Arrangement Or Associate Eight teen [Member] | Third parties          
Joint arrangements and associates          
% Ownership 30.40%        
Power | Italy | Joint Arrangement Or Associate One [Member]          
Joint arrangements and associates          
Company name Società EniPower Ferrara Srl (†)        
Registered office San Donato Milanese (MI)        
Country of operation Italy        
Share capital   € 140,000,000      
% Equity ratio 51.00%        
Consolidation or valuation method J.O.        
Power | Italy | Joint Arrangement Or Associate One [Member] | EniPower SpA          
Joint arrangements and associates          
% Ownership 51.00%        
Power | Italy | Joint Arrangement Or Associate One [Member] | Third parties          
Joint arrangements and associates          
% Ownership 49.00%