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Other information about investments - Joint arrangements and associates - Global Gas & LNG Portfolio (Details)
12 Months Ended
Dec. 31, 2022
EUR (€)
Dec. 31, 2022
CHF (SFr)
Dec. 31, 2022
TND (د.ت)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
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
Global Gas & LNG Portfolio | Italy | Joint Arrangement Or Associate One [Member]          
Joint arrangements and associates          
Company name Mariconsult SpA (†)        
Registered office Milan        
Country of operation Italy        
Share capital € 120,000        
Consolidation or valuation method Eq.        
Global Gas & LNG Portfolio | Italy | Joint Arrangement Or Associate One [Member] | Eni Corridor Srl          
Joint arrangements and associates          
% Ownership 50.00%        
Global Gas & LNG Portfolio | Italy | Joint Arrangement Or Associate One [Member] | Third parties          
Joint arrangements and associates          
% Ownership 50.00%        
Global Gas & LNG Portfolio | Italy | Joint Arrangement Or Associate Two [Member]          
Joint arrangements and associates          
Company name Transmed SpA (†)        
Registered office Milan        
Country of operation Italy        
Share capital € 240,000        
Consolidation or valuation method Eq.        
Global Gas & LNG Portfolio | Italy | Joint Arrangement Or Associate Two [Member] | Eni Corridor Srl          
Joint arrangements and associates          
% Ownership 50.00%        
Global Gas & LNG Portfolio | Italy | Joint Arrangement Or Associate Two [Member] | Third parties          
Joint arrangements and associates          
% Ownership 50.00%        
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Three [Member]          
Joint arrangements and associates          
Company name Blue Stream Pipeline Co BV (†)        
Registered office Amsterdam (Netherlands)        
Country of operation Russia        
Share capital | $       $ 22,000  
% Equity ratio 74.62%        
Consolidation or valuation method J.O.        
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Three [Member] | Eni International BV          
Joint arrangements and associates          
% Ownership 50.00%        
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Three [Member] | Third parties          
Joint arrangements and associates          
% Ownership 50.00%        
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Four [Member]          
Joint arrangements and associates          
Company name Damietta LNG (DLNG) SAE (†)        
Registered office Damietta (Egypt)        
Country of operation Egypt        
Share capital | $       375,000,000  
% Equity ratio 50.00%        
Consolidation or valuation method J.O.        
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Four [Member] | Eni Gas Liquefaction BV [member]          
Joint arrangements and associates          
% Ownership 50.00%        
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Four [Member] | Third parties          
Joint arrangements and associates          
% Ownership 50.00%        
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Five [Member]          
Joint arrangements and associates          
Company name DLNG Service SAE (†) (former SEGAS Services SAE)        
Registered office Damietta (Egypt)        
Country of operation Egypt        
Share capital | $       1,000,000  
% Equity ratio 50.00%        
Consolidation or valuation method J.O.        
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Five [Member] | Eni Gas Liquefaction BV [member]          
Joint arrangements and associates          
% Ownership 1.00%        
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Five [Member] | Damietta LNG (DLNG) SAE          
Joint arrangements and associates          
% Ownership 98.00%        
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Five [Member] | Third parties          
Joint arrangements and associates          
% Ownership 1.00%        
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Six [Member]          
Joint arrangements and associates          
Company name GreenStream BV (†)        
Registered office Amsterdam (Netherlands)        
Country of operation Libya        
Share capital € 200,000,000        
% Equity ratio 50.00%        
Consolidation or valuation method J.O.        
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Six [Member] | Eni North Africa BV          
Joint arrangements and associates          
% Ownership 50.00%        
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Six [Member] | Third parties          
Joint arrangements and associates          
% Ownership 50.00%        
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Seven [Member]          
Joint arrangements and associates          
Company name Premium Multiservices SA        
Registered office Tunis (Tunisia)        
Country of operation Tunisia        
Share capital | د.ت     د.ت 200,000    
Consolidation or valuation method Eq.        
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Seven [Member] | Sergaz SA          
Joint arrangements and associates          
% Ownership 49.99%        
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Seven [Member] | Third parties          
Joint arrangements and associates          
% Ownership 50.01%        
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Eight [Member]          
Joint arrangements and associates          
Company name SAMCO Sagl        
Registered office Lugano (Switzerland)        
Country of operation Switzerland        
Share capital | SFr   SFr 20,000      
Consolidation or valuation method Eq.        
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Eight [Member] | Transmed Pip Co Ltd          
Joint arrangements and associates          
% Ownership 90.00%        
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Eight [Member] | Eni Corridor Srl          
Joint arrangements and associates          
% Ownership 5.00%        
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Eight [Member] | Third parties          
Joint arrangements and associates          
% Ownership 5.00%        
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Nine [Member]          
Joint arrangements and associates          
Company name Société Energies Renouvelables Eni-ETAP SA (†)        
Registered office Tunis (Tunisia)        
Country of operation Tunisia        
Share capital | د.ت     د.ت 1,000,000    
Consolidation or valuation method Eq.        
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Nine [Member] | Eni International BV          
Joint arrangements and associates          
% Ownership 50.00%        
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Nine [Member] | Third parties          
Joint arrangements and associates          
% Ownership 50.00%        
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Ten [Member]          
Joint arrangements and associates          
Company name Transmediterranean Pipeline Co Ltd (†)        
Registered office St. Helier(Jersey)        
Country of operation Jersey        
Share capital | $       $ 10,310,000  
% Equity ratio 50.00%        
Consolidation or valuation method J.O.        
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Ten [Member] | Eni Corridor Srl          
Joint arrangements and associates          
% Ownership 50.00%        
Global Gas & LNG Portfolio | Foreign (outside Italy) | Joint Arrangement Or Associate Ten [Member] | Third parties          
Joint arrangements and associates          
% Ownership 50.00%