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Other information about investments - Joint arrangements and associates - Refining Marketing and Chemical (Details)
 12 Months Ended
Dec. 31, 2020
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Dec. 31, 2020
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Dec. 31, 2020
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Dec. 31, 2020
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Dec. 31, 2020
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Dec. 31, 2020
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Dec. 31, 2020
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Dec. 31, 2020
USD ($)
Dec. 31, 2020
EUR (€)
Dec. 31, 2019
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
Refining & Marketing | Italy | Joint Arrangement Or Associate One [Member]                    
Joint arrangements and associates                    
Company name Arezzo Gas SpA (†)                  
Registered office Arezzo                  
Country of operation Italy                  
Share capital                 394,000  
Consolidation or valuation method Eq.                  
Refining & Marketing | Italy | Joint Arrangement Or Associate One [Member] | Eni Fuel SpA [Member]                    
Joint arrangements and associates                    
% Ownership 50.00%                  
Refining & Marketing | Italy | Joint Arrangement Or Associate One [Member] | Third parties                    
Joint arrangements and associates                    
% Ownership 50.00%                  
Refining & Marketing | Italy | Joint Arrangement Or Associate Two [Member]                    
Joint arrangements and associates                    
Company name CePIM Centro Padano Interscambio Merci SpA                  
Registered office Fontevivo (PR)                  
Country of operation Italy                  
Share capital                 6,642,928.32  
Consolidation or valuation method Eq.                  
Refining & Marketing | Italy | Joint Arrangement Or Associate Two [Member] | Third parties                    
Joint arrangements and associates                    
% Ownership 55.22%                  
Refining & Marketing | Italy | Joint Arrangement Or Associate Two [Member] | Ecofuel SpA [Member]                    
Joint arrangements and associates                    
% Ownership 44.78%                  
Refining & Marketing | Italy | Joint Arrangement Or Associate Three [Member]                    
Joint arrangements and associates                    
Company name Consorzio Operatori GPL di Napoli                  
Registered office Napoli                  
Country of operation Italy                  
Share capital                 102,000  
Consolidation or valuation method Co.                  
Refining & Marketing | Italy | Joint Arrangement Or Associate Three [Member] | Eni Fuel SpA [Member]                    
Joint arrangements and associates                    
% Ownership 25.00%                  
Refining & Marketing | Italy | Joint Arrangement Or Associate Three [Member] | Third parties                    
Joint arrangements and associates                    
% Ownership 75.00%                  
Refining & Marketing | Italy | Joint Arrangement Or Associate Four [Member]                    
Joint arrangements and associates                    
Company name Costiero Gas Livorno SpA(†)                  
Registered office Livorno                  
Country of operation Italy                  
Share capital                 26,000,000  
% Equity ratio 65.00%                  
Consolidation or valuation method J.O.                  
Refining & Marketing | Italy | Joint Arrangement Or Associate Four [Member] | Eni Fuel SpA [Member]                    
Joint arrangements and associates                    
% Ownership 65.00%                  
Refining & Marketing | Italy | Joint Arrangement Or Associate Four [Member] | Third parties                    
Joint arrangements and associates                    
% Ownership 35.00%                  
Refining & Marketing | Italy | Joint Arrangement Or Associate Five [Member]                    
Joint arrangements and associates                    
Company name Disma SpA                  
Registered office Segrate (MI)                  
Country of operation Italy                  
Share capital                 2,600,000  
Consolidation or valuation method Eq.                  
Refining & Marketing | Italy | Joint Arrangement Or Associate Five [Member] | Eni Fuel SpA [Member]                    
Joint arrangements and associates                    
% Ownership 25.00%                  
Refining & Marketing | Italy | Joint Arrangement Or Associate Five [Member] | Third parties                    
Joint arrangements and associates                    
% Ownership 75.00%                  
Refining & Marketing | Italy | Joint Arrangement Or Associate Six [Member]                    
Joint arrangements and associates                    
Company name Livorno LNG Terminal SpA                  
Registered office Livorno                  
Country of operation Italy                  
Share capital                 200,000  
Consolidation or valuation method Eq.                  
Refining & Marketing | Italy | Joint Arrangement Or Associate Six [Member] | Third parties                    
Joint arrangements and associates                    
% Ownership 50.00%                  
Refining & Marketing | Italy | Joint Arrangement Or Associate Six [Member] | Costiero Gas Liv SpA [Member]                    
Joint arrangements and associates                    
% Ownership 50.00%                  
Refining & Marketing | Italy | Joint Arrangement Or Associate Seven [Member]                    
Joint arrangements and associates                    
Company name Porto Petroli di Genova SpA                  
Registered office Genova                  
Country of operation Italy                  
Share capital                 2,068,000  
Consolidation or valuation method Eq.                  
Refining & Marketing | Italy | Joint Arrangement Or Associate Seven [Member] | Third parties                    
Joint arrangements and associates                    
% Ownership 59.50%                  
Refining & Marketing | Italy | Joint Arrangement Or Associate Seven [Member] | Ecofuel SpA [Member]                    
Joint arrangements and associates                    
% Ownership 40.50%                  
Refining & Marketing | Italy | Joint Arrangement Or Associate Eight [Member]                    
Joint arrangements and associates                    
Company name Raffineria di Milazzo ScpA(†)                  
Registered office Milazzo (ME)                  
Country of operation Italy                  
Share capital                 171,143,000  
% Equity ratio 50.00%                  
Consolidation or valuation method J.O.                  
Refining & Marketing | Italy | Joint Arrangement Or Associate Eight [Member] | ENI SpA                    
Joint arrangements and associates                    
% Ownership 50.00%                  
Refining & Marketing | Italy | Joint Arrangement Or Associate Eight [Member] | Third parties                    
Joint arrangements and associates                    
% Ownership 50.00%                  
Refining & Marketing | Italy | Joint Arrangement Or Associate Nine [Member]                    
Joint arrangements and associates                    
Company name Seram SpA                  
Registered office Fiumicino (RM)                  
Country of operation Italy                  
Share capital                 852,000  
Consolidation or valuation method Eq.                  
Refining & Marketing | Italy | Joint Arrangement Or Associate Nine [Member] | ENI SpA                    
Joint arrangements and associates                    
% Ownership 25.00%                  
Refining & Marketing | Italy | Joint Arrangement Or Associate Nine [Member] | Third parties                    
Joint arrangements and associates                    
% Ownership 75.00%                  
Refining & Marketing | Italy | Joint Arrangement Or Associate Ten [Member]                    
Joint arrangements and associates                    
Company name Sigea Sistema Integrato Genova Arquata SpA                  
Registered office Genova                  
Country of operation Italy                  
Share capital                 3,326,900  
Consolidation or valuation method Eq.                  
Refining & Marketing | Italy | Joint Arrangement Or Associate Ten [Member] | Third parties                    
Joint arrangements and associates                    
% Ownership 65.00%                  
Refining & Marketing | Italy | Joint Arrangement Or Associate Ten [Member] | Ecofuel SpA [Member]                    
Joint arrangements and associates                    
% Ownership 35.00%                  
Refining & Marketing | Italy | Joint Arrangement Or Associate Eleven [Member]                    
Joint arrangements and associates                    
Company name Società Oleodotti Meridionali - SOM SpA(†)                  
Registered office Rome                  
Country of operation Italy                  
Share capital                 3,085,000  
Consolidation or valuation method Eq.                  
Refining & Marketing | Italy | Joint Arrangement Or Associate Eleven [Member] | ENI SpA                    
Joint arrangements and associates                    
% Ownership 70.00%                  
Refining & Marketing | Italy | Joint Arrangement Or Associate Eleven [Member] | Third parties                    
Joint arrangements and associates                    
% Ownership 30.00%                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twelve [Member]                    
Joint arrangements and associates                    
Company name Abu Dhabi Oil Refining Company (TAKREER)                  
Registered office Abu Dhabi (United Arab Emirates)                  
Country of operation United Arab Emirates                  
Share capital | د.إ   د.إ 500,000,000                
Consolidation or valuation method Eq.                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twelve [Member] | Third parties                    
Joint arrangements and associates                    
% Ownership 80.00%                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twelve [Member] | Eni Abu Dhabi R&T BV [Member]                    
Joint arrangements and associates                    
% Ownership 20.00%                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Thirteen [Member]                    
Joint arrangements and associates                    
Company name ADNOC Global Trading Ltd                  
Registered office Abu Dhabi (United Arab Emirates)                  
Country of operation United Arab Emirates                  
Share capital | $               $ 1,000    
Consolidation or valuation method Eq.                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Thirteen [Member] | Third parties                    
Joint arrangements and associates                    
% Ownership 80.00%                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Thirteen [Member] | Eni Abu Dhabi R&T BV [Member]                    
Joint arrangements and associates                    
% Ownership 20.00%                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Fourteen [Member]                    
Joint arrangements and associates                    
Company name AET - Raffineriebeteiligungs gesellschaft mbH(†)                  
Registered office Schwedt (Germany)                  
Country of operation Germany                  
Share capital                 27,000  
Consolidation or valuation method Eq.                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Fourteen [Member] | Third parties                    
Joint arrangements and associates                    
% Ownership 66.67%                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Fourteen [Member] | Eni Deutsch GmbH                    
Joint arrangements and associates                    
% Ownership 33.33%                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Fifteen [Member]                    
Joint arrangements and associates                    
Company name Bayernoil Raffineriegesellschaft mbH(†)                  
Registered office Vohburg (Germany)                  
Country of operation Germany                  
Share capital                 10,226,000  
% Equity ratio 20.00%                  
Consolidation or valuation method J.O.                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Fifteen [Member] | Third parties                    
Joint arrangements and associates                    
% Ownership 80.00%                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Fifteen [Member] | Eni Deutsch GmbH                    
Joint arrangements and associates                    
% Ownership 20.00%                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Sixteen [Member]                    
Joint arrangements and associates                    
Company name City Carburoil SA(†)                  
Registered office Rivera (Switzerland)                  
Country of operation Switzerland                  
Share capital | SFr     SFr 6,000,000              
Consolidation or valuation method Eq.                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Sixteen [Member] | Third parties                    
Joint arrangements and associates                    
% Ownership 50.09%                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Sixteen [Member] | Eni Suisse SA [Member]                    
Joint arrangements and associates                    
% Ownership 49.91%                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Seven teen [Member]                    
Joint arrangements and associates                    
Company name Egyptian International Gas Technology Co                  
Registered office Cairo (Egypt)                  
Country of operation Egypt                  
Share capital | ج.م.         ج.م. 100,000,000          
Consolidation or valuation method Co.                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Seven teen [Member] | Third parties                    
Joint arrangements and associates                    
% Ownership 60.00%                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Seven teen [Member] | Eni International BV                    
Joint arrangements and associates                    
% Ownership 40.00%                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Eight teen [Member]                    
Joint arrangements and associates                    
Company name ENEOS Italsing Pte Ltd                  
Registered office Singapore (Singapore)                  
Country of operation Singapore                  
Share capital | $           $ 12,000,000        
Consolidation or valuation method Eq.                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Eight teen [Member] | Third parties                    
Joint arrangements and associates                    
% Ownership 77.50%                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Eight teen [Member] | Eni International BV                    
Joint arrangements and associates                    
% Ownership 22.50%                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Nine teen [Member]                    
Joint arrangements and associates                    
Company name Fuelling Aviation Services GIE                  
Registered office Tremblay en France (France)                  
Country of operation France                  
Share capital                 1  
Consolidation or valuation method Co.                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Nine teen [Member] | Third parties                    
Joint arrangements and associates                    
% Ownership 75.00%                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Nine teen [Member] | Eni France Sarl [Member]                    
Joint arrangements and associates                    
% Ownership 25.00%                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twenty [Member]                    
Joint arrangements and associates                    
Company name Mediterranée Bitumes SA                  
Registered office Tunisi (Tunisia)                  
Country of operation Tunisia                  
Share capital | د.ت       د.ت 1,000,000            
Consolidation or valuation method Eq.                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twenty [Member] | Third parties                    
Joint arrangements and associates                    
% Ownership 66.00%                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twenty [Member] | Eni International BV                    
Joint arrangements and associates                    
% Ownership 34.00%                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twenty one [Member]                    
Joint arrangements and associates                    
Company name Routex BV                  
Registered office Amsterdam (Netherlands)                  
Country of operation Netherlands                  
Share capital                 67,500  
Consolidation or valuation method Eq.                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twenty one [Member] | Third parties                    
Joint arrangements and associates                    
% Ownership 80.00%                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twenty one [Member] | Eni International BV                    
Joint arrangements and associates                    
% Ownership 20.00%                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twenty two [Member]                    
Joint arrangements and associates                    
Company name Saraco SA                  
Registered office Meyrin (Switzerland)                  
Country of operation Switzerland                  
Share capital | SFr     SFr 420,000              
Consolidation or valuation method Co.                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twenty two [Member] | Third parties                    
Joint arrangements and associates                    
% Ownership 80.00%                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twenty two [Member] | Eni Suisse SA [Member]                    
Joint arrangements and associates                    
% Ownership 20.00%                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twenty three [Member]                    
Joint arrangements and associates                    
Company name Supermetanol CA(†)                  
Registered office Jose Puerto La Cruz (Venezuela)                  
Country of operation Venezuela                  
Share capital |             120.867      
% Equity ratio 50.00%                  
Consolidation or valuation method J.O.                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twenty three [Member] | Third parties                    
Joint arrangements and associates                    
% Ownership 35.42%                  
% Equity ratio 50.00%                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twenty three [Member] | Ecofuel SpA [Member]                    
Joint arrangements and associates                    
% Ownership 34.51%                  
% Equity ratio 50.00%                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twenty three [Member] | Supermetanol CA [Member]                    
Joint arrangements and associates                    
% Ownership 30.07%                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twenty four [Member]                    
Joint arrangements and associates                    
Company name TBG Tanklager Betriebsgesellschaft GmbH(†)                  
Registered office Salzburg (Austria)                  
Country of operation Austria                  
Share capital                 43,603.70  
Consolidation or valuation method Eq.                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twenty four [Member] | Third parties                    
Joint arrangements and associates                    
% Ownership 50.00%                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twenty four [Member] | Eni Market A GmbH [Member]                    
Joint arrangements and associates                    
% Ownership 50.00%                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twenty five [Member]                    
Joint arrangements and associates                    
Company name Weat Electronic Datenservice GmbH                  
Registered office Düsseldorf (Germany)                  
Country of operation Germany                  
Share capital                 409,034  
Consolidation or valuation method Eq.                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twenty five [Member] | Third parties                    
Joint arrangements and associates                    
% Ownership 80.00%                  
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twenty five [Member] | Eni Deutsch GmbH                    
Joint arrangements and associates                    
% Ownership 20.00%                  
Chemicals | Italy | Joint Arrangement Or Associate Twenty six [Member]                    
Joint arrangements and associates                    
Company name Brindisi Servizi Generali Scarl                  
Registered office Brindisi                  
Country of operation Italy                  
Share capital                 1,549,060  
Consolidation or valuation method Eq.                  
Chemicals | Italy | Joint Arrangement Or Associate Twenty six [Member] | Third parties                    
Joint arrangements and associates                    
% Ownership 21.90%                  
Chemicals | Italy | Joint Arrangement Or Associate Twenty six [Member] | Versalis SpA [Member]                    
Joint arrangements and associates                    
% Ownership 49.00%                  
Chemicals | Italy | Joint Arrangement Or Associate Twenty six [Member] | Eni Rewind SpA                    
Joint arrangements and associates                    
% Ownership 20.20%                  
Chemicals | Italy | Joint Arrangement Or Associate Twenty six [Member] | EniPower SpA                    
Joint arrangements and associates                    
% Ownership 8.90%                  
Chemicals | Italy | Joint Arrangement Or Associate Twenty seven [Member]                    
Joint arrangements and associates                    
Company name Finproject SpA                  
Registered office Morrovalle (MC)                  
Country of operation Italy                  
Share capital                 18,500,000  
Consolidation or valuation method Eq.                  
Chemicals | Italy | Joint Arrangement Or Associate Twenty seven [Member] | Third parties                    
Joint arrangements and associates                    
% Ownership 60.00%                  
Chemicals | Italy | Joint Arrangement Or Associate Twenty seven [Member] | Versalis SpA [Member]                    
Joint arrangements and associates                    
% Ownership 40.00%                  
Chemicals | Italy | Joint Arrangement Or Associate Twenty eight [Member]                    
Joint arrangements and associates                    
Company name IFM Ferrara ScpA                  
Registered office Ferrara                  
Country of operation Italy                  
Share capital                 5,270,466  
Consolidation or valuation method Eq.                  
Chemicals | Italy | Joint Arrangement Or Associate Twenty eight [Member] | Third parties                    
Joint arrangements and associates                    
% Ownership 57.98%                  
Chemicals | Italy | Joint Arrangement Or Associate Twenty eight [Member] | S.E.F. Srl [Member]                    
Joint arrangements and associates                    
% Ownership 10.70%                  
Chemicals | Italy | Joint Arrangement Or Associate Twenty eight [Member] | Versalis SpA [Member]                    
Joint arrangements and associates                    
% Ownership 19.74%                  
Chemicals | Italy | Joint Arrangement Or Associate Twenty eight [Member] | Eni Rewind SpA                    
Joint arrangements and associates                    
% Ownership 11.58%                  
Chemicals | Italy | Joint Arrangement Or Associate Twenty nine [Member]                    
Joint arrangements and associates                    
Company name Matrìca SpA(†)                  
Registered office Porto Torres (SS)                  
Country of operation Italy                  
Share capital                 37,500,000  
Consolidation or valuation method Eq.                  
Chemicals | Italy | Joint Arrangement Or Associate Twenty nine [Member] | Third parties                    
Joint arrangements and associates                    
% Ownership 50.00%                  
Chemicals | Italy | Joint Arrangement Or Associate Twenty nine [Member] | Versalis SpA [Member]                    
Joint arrangements and associates                    
% Ownership 50.00%                  
Chemicals | Italy | Joint Arrangement Or Associate Thirty [Member]                    
Joint arrangements and associates                    
Company name Priolo Servizi ScpA                  
Registered office Melilli (SR)                  
Country of operation Italy                  
Share capital                 28,100,000  
Consolidation or valuation method Eq.                  
Chemicals | Italy | Joint Arrangement Or Associate Thirty [Member] | Third parties                    
Joint arrangements and associates                    
% Ownership 59.81%                  
Chemicals | Italy | Joint Arrangement Or Associate Thirty [Member] | Versalis SpA [Member]                    
Joint arrangements and associates                    
% Ownership 35.15%                  
Chemicals | Italy | Joint Arrangement Or Associate Thirty [Member] | Eni Rewind SpA                    
Joint arrangements and associates                    
% Ownership 5.04%                  
Chemicals | Italy | Joint Arrangement Or Associate Thirty one [Member]                    
Joint arrangements and associates                    
Company name Ravenna Servizi Industriali ScpA                  
Registered office Ravenna                  
Country of operation Italy                  
Share capital                 5,597,400  
Consolidation or valuation method Eq.                  
Chemicals | Italy | Joint Arrangement Or Associate Thirty one [Member] | Third parties                    
Joint arrangements and associates                    
% Ownership 25.65%                  
Chemicals | Italy | Joint Arrangement Or Associate Thirty one [Member] | Ecofuel SpA [Member]                    
Joint arrangements and associates                    
% Ownership 1.85%                  
Chemicals | Italy | Joint Arrangement Or Associate Thirty one [Member] | Versalis SpA [Member]                    
Joint arrangements and associates                    
% Ownership 42.13%                  
Chemicals | Italy | Joint Arrangement Or Associate Thirty one [Member] | EniPower SpA                    
Joint arrangements and associates                    
% Ownership 30.37%                  
Chemicals | Italy | Joint Arrangement Or Associate Thirty two [Member]                    
Joint arrangements and associates                    
Company name Servizi Porto Marghera Scarl                  
Registered office Venezia Marghera (VE)                  
Country of operation Italy                  
Share capital                 € 8,695,718  
Consolidation or valuation method Eq.                  
Chemicals | Italy | Joint Arrangement Or Associate Thirty two [Member] | Third parties                    
Joint arrangements and associates                    
% Ownership 13.17%                  
Chemicals | Italy | Joint Arrangement Or Associate Thirty two [Member] | Versalis SpA [Member]                    
Joint arrangements and associates                    
% Ownership 48.44%                  
Chemicals | Italy | Joint Arrangement Or Associate Thirty two [Member] | Eni Rewind SpA                    
Joint arrangements and associates                    
% Ownership 38.39%                  
Chemicals | Foreign (outside Italy) | Joint Arrangement Or Associate Thirty three [Member]                    
Joint arrangements and associates                    
Company name Lotte Versalis Elastomers Co Ltd(†)                  
Registered office Yeosu (South Korea)                  
Country of operation South Korea                  
Share capital | ₩ ₩ 501,800,000,000                  
Consolidation or valuation method Eq.                  
Chemicals | Foreign (outside Italy) | Joint Arrangement Or Associate Thirty three [Member] | Third parties                    
Joint arrangements and associates                    
% Ownership 50.00%                  
Chemicals | Foreign (outside Italy) | Joint Arrangement Or Associate Thirty three [Member] | Versalis SpA [Member]                    
Joint arrangements and associates                    
% Ownership 50.00%                  
Chemicals | Foreign (outside Italy) | Joint Arrangement Or Associate Thirty four [Member]                    
Joint arrangements and associates                    
Company name VPM Oilfield Specialty Chemicals Llc (†)                  
Registered office Abu Dhabi (United Arab Emirates)                  
Country of operation United Arab Emirates                  
Share capital | د.إ   د.إ 1,000,000                
Consolidation or valuation method Eq.                  
Chemicals | Foreign (outside Italy) | Joint Arrangement Or Associate Thirty four [Member] | Third parties                    
Joint arrangements and associates                    
% Ownership 51.00%                  
Chemicals | Foreign (outside Italy) | Joint Arrangement Or Associate Thirty four [Member] | Versalis SpA [Member]                    
Joint arrangements and associates                    
% Ownership 49.00%