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Other information about investments - Joint arrangements and associates - Refining Marketing and Chemical (Details)
 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2021
EUR (€)
Dec. 31, 2021
EGP (ج.م.)
Dec. 31, 2021
TND (د.ت)
Dec. 31, 2021
CHF (SFr)
Dec. 31, 2021
SGD ($)
Dec. 31, 2021
KZT (₸)
Dec. 31, 2021
VEF
Dec. 31, 2021
AED (د.إ)
Dec. 31, 2021
KRW (₩)
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
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                      
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] | Ecofuel SpA                      
Joint arrangements and associates                      
% Ownership 44.78%                    
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 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                      
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                      
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                      
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 (in liquidation)                    
Registered office Livorno                    
Country of operation Italy                    
Share capital   200,000                  
Consolidation or valuation method Co.                    
Refining & Marketing | Italy | Joint Arrangement Or Associate Six [Member] | Costiero Gas Liv SpA                      
Joint arrangements and associates                      
% Ownership 50.00%                    
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 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] | Ecofuel SpA                      
Joint arrangements and associates                      
% Ownership 40.50%                    
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 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] | Ecofuel SpA                      
Joint arrangements and associates                      
% Ownership 35.00%                    
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 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 | Italy | Joint Arrangement Or Associate Twelve [Member]                      
Joint arrangements and associates                      
Company name South Italy Green Hydrogen Srl (†)                    
Registered office Rome                    
Country of operation Italy                    
Share capital   10,000                  
Consolidation or valuation method Eq.                    
Refining & Marketing | Italy | Joint Arrangement Or Associate Twelve [Member] | ENI SpA                      
Joint arrangements and associates                      
% Ownership 50.00%                    
Refining & Marketing | Italy | Joint Arrangement Or Associate Twelve [Member] | Third parties                      
Joint arrangements and associates                      
% Ownership 50.00%                    
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Thirteen [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 Thirteen [Member] | Eni Abu Dhabi R&T BV                      
Joint arrangements and associates                      
% Ownership 20.00%                    
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 Fourteen [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 | $ $ 100,000,000                    
Consolidation or valuation method Eq.                    
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Fourteen [Member] | Eni Abu Dhabi R&T BV                      
Joint arrangements and associates                      
% Ownership 20.00%                    
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Fourteen [Member] | Third parties                      
Joint arrangements and associates                      
% Ownership 80.00%                    
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Fifteen [Member]                      
Joint arrangements and associates                      
Company name AET - Raffineriebeteiligungsgesellschaft 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 Fifteen [Member] | Eni Deutsch GmbH                      
Joint arrangements and associates                      
% Ownership 33.33%                    
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Fifteen [Member] | Third parties                      
Joint arrangements and associates                      
% Ownership 66.67%                    
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Sixteen [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 Sixteen [Member] | Eni Deutsch GmbH                      
Joint arrangements and associates                      
% Ownership 20.00%                    
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Sixteen [Member] | Third parties                      
Joint arrangements and associates                      
% Ownership 80.00%                    
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Seven teen [Member]                      
Joint arrangements and associates                      
Company name City Carburoil SA(†)                    
Registered office Monteceneri (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 Seven teen [Member] | Eni Suisse SA                      
Joint arrangements and associates                      
% Ownership 49.91%                    
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Seven teen [Member] | Third parties                      
Joint arrangements and associates                      
% Ownership 50.09%                    
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Eight teen [Member]                      
Joint arrangements and associates                      
Company name Egyptian International Gas Technology Co                    
Registered office New 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 Eight teen [Member] | Eni International BV                      
Joint arrangements and associates                      
% Ownership 40.00%                    
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Eight teen [Member] | Third parties                      
Joint arrangements and associates                      
% Ownership 60.00%                    
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Nine 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 Nine teen [Member] | Eni International BV                      
Joint arrangements and associates                      
% Ownership 22.50%                    
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Nine teen [Member] | Third parties                      
Joint arrangements and associates                      
% Ownership 77.50%                    
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twenty [Member]                      
Joint arrangements and associates                      
Company name Fuelling Aviation Services GIE                    
Registered office Tremblay-en-France (France)                    
Country of operation France                    
Share capital   0                  
Consolidation or valuation method Co.                    
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twenty [Member] | Eni France Sarl                      
Joint arrangements and associates                      
% Ownership 25.00%                    
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twenty [Member] | Third parties                      
Joint arrangements and associates                      
% Ownership 75.00%                    
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twenty one [Member]                      
Joint arrangements and associates                      
Company name Mediterranée Bitumes SA                    
Registered office Tunis (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 one [Member] | Eni International BV                      
Joint arrangements and associates                      
% Ownership 34.00%                    
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twenty one [Member] | Third parties                      
Joint arrangements and associates                      
% Ownership 66.00%                    
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twenty two [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 two [Member] | Eni International BV                      
Joint arrangements and associates                      
% Ownership 20.00%                    
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 three [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 three [Member] | Eni Suisse SA                      
Joint arrangements and associates                      
% Ownership 20.00%                    
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twenty three [Member] | Third parties                      
Joint arrangements and associates                      
% Ownership 80.00%                    
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twenty four [Member]                      
Joint arrangements and associates                      
Company name Supermetanol CA(†)                    
Registered office Jose Puerto La Cruz (Venezuela)                    
Country of operation Venezuela                    
Share capital | VEF               VEF 0      
% Equity ratio 50.00%                    
Consolidation or valuation method J.O.                    
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twenty four [Member] | Ecofuel SpA                      
Joint arrangements and associates                      
% Ownership 34.51%                    
% Equity ratio 50.00%                    
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twenty four [Member] | Supermetanol CA                      
Joint arrangements and associates                      
% Ownership 30.07%                    
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twenty four [Member] | Third parties                      
Joint arrangements and associates                      
% Ownership 35.42%                    
% Equity ratio 50.00%                    
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twenty five [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 five [Member] | Eni Market A GmbH                      
Joint arrangements and associates                      
% Ownership 50.00%                    
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twenty five [Member] | Third parties                      
Joint arrangements and associates                      
% Ownership 50.00%                    
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twenty six [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 six [Member] | Eni Deutsch GmbH                      
Joint arrangements and associates                      
% Ownership 20.00%                    
Refining & Marketing | Foreign (outside Italy) | Joint Arrangement Or Associate Twenty six [Member] | Third parties                      
Joint arrangements and associates                      
% Ownership 80.00%                    
Chemicals | Italy | Joint Arrangement Or Associate Twenty seven [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 seven [Member] | Versalis SpA                      
Joint arrangements and associates                      
% Ownership 49.00%                    
Chemicals | Italy | Joint Arrangement Or Associate Twenty seven [Member] | Eni Rewind SpA                      
Joint arrangements and associates                      
% Ownership 20.20%                    
Chemicals | Italy | Joint Arrangement Or Associate Twenty seven [Member] | EniPower SpA                      
Joint arrangements and associates                      
% Ownership 8.90%                    
Chemicals | Italy | Joint Arrangement Or Associate Twenty seven [Member] | Third parties                      
Joint arrangements and associates                      
% Ownership 21.90%                    
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] | S.E.F. Srl                      
Joint arrangements and associates                      
% Ownership 10.70%                    
Chemicals | Italy | Joint Arrangement Or Associate Twenty eight [Member] | Versalis SpA                      
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 eight [Member] | Third parties                      
Joint arrangements and associates                      
% Ownership 57.98%                    
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] | Versalis SpA                      
Joint arrangements and associates                      
% Ownership 50.00%                    
Chemicals | Italy | Joint Arrangement Or Associate Twenty nine [Member] | Third parties                      
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] | Versalis SpA                      
Joint arrangements and associates                      
% Ownership 37.22%                    
Chemicals | Italy | Joint Arrangement Or Associate Thirty [Member] | Eni Rewind SpA                      
Joint arrangements and associates                      
% Ownership 5.65%                    
Chemicals | Italy | Joint Arrangement Or Associate Thirty [Member] | Third parties                      
Joint arrangements and associates                      
% Ownership 57.13%                    
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] | Ecofuel SpA                      
Joint arrangements and associates                      
% Ownership 1.85%                    
Chemicals | Italy | Joint Arrangement Or Associate Thirty one [Member] | Versalis SpA                      
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 one [Member] | Third parties                      
Joint arrangements and associates                      
% Ownership 25.65%                    
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] | Versalis SpA                      
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 | Italy | Joint Arrangement Or Associate Thirty two [Member] | Third parties                      
Joint arrangements and associates                      
% Ownership 13.17%                    
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 | ₩                   ₩ 551,800,000,000  
Consolidation or valuation method Eq.                    
Chemicals | Foreign (outside Italy) | Joint Arrangement Or Associate Thirty three [Member] | Versalis SpA                      
Joint arrangements and associates                      
% Ownership 50.00%                    
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 four [Member]                      
Joint arrangements and associates                      
Company name Versalis Chem-invest LLP (†)                    
Registered office Uralsk City (Kazakhstan)                    
Country of operation Kzakhstan                    
Share capital | ₸             ₸ 64,194,000        
Consolidation or valuation method Eq.                    
Chemicals | Foreign (outside Italy) | Joint Arrangement Or Associate Thirty four [Member] | Versalis Intern. SA                      
Joint arrangements and associates                      
% Ownership 49.00%                    
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 five [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 five [Member] | Versalis Intern. SA                      
Joint arrangements and associates                      
% Ownership 49.00%                    
Chemicals | Foreign (outside Italy) | Joint Arrangement Or Associate Thirty five [Member] | Third parties                      
Joint arrangements and associates                      
% Ownership 51.00%