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Other information about investments (Details 7)
 12 Months Ended
Dec. 31, 2018
EUR (€)
Dec. 31, 2018
GHS (GH₵)
Dec. 31, 2018
KRW (₩)
Dec. 31, 2017
EUR (€)
Disclosure of subsidiaries [line items]        
Share capital € 4,005,000,000     € 4,005,000,000
In Italy [Member] | Chemical [Member] | Subsidiaries One [Member]        
Disclosure of subsidiaries [line items]        
Company name Brindisi Servizi Generali Scarl      
Registered office Brindisi      
Country of operation Italy      
Share capital € 1,549,060      
Consolidation or valutation method [1] Eq.      
In Italy [Member] | Chemical [Member] | Subsidiaries One [Member] | Versalis SpA [Member]        
Disclosure of subsidiaries [line items]        
Name Of Share holders Versalis SpA      
% Ownership 49.00%      
In Italy [Member] | Chemical [Member] | Subsidiaries One [Member] | Syndial SpA [Member]        
Disclosure of subsidiaries [line items]        
Name Of Share holders Syndial SpA      
% Ownership 20.20%      
In Italy [Member] | Chemical [Member] | Subsidiaries One [Member] | Eni Power SpA [Member]        
Disclosure of subsidiaries [line items]        
Name Of Share holders EniPower SpA      
% Ownership 8.90%      
In Italy [Member] | Chemical [Member] | Subsidiaries One [Member] | Third parties [Member]        
Disclosure of subsidiaries [line items]        
Name Of Share holders Third parties      
% Ownership 21.90%      
In Italy [Member] | Chemical [Member] | Subsidiaries Two [Member]        
Disclosure of subsidiaries [line items]        
Company name IFM Ferrara ScpA      
Registered office Ferrara      
Country of operation Italy      
Share capital € 5,270,466      
Consolidation or valutation method [1] Eq.      
In Italy [Member] | Chemical [Member] | Subsidiaries Two [Member] | Versalis SpA [Member]        
Disclosure of subsidiaries [line items]        
Name Of Share holders Versalis SpA      
% Ownership 19.74%      
In Italy [Member] | Chemical [Member] | Subsidiaries Two [Member] | Syndial SpA [Member]        
Disclosure of subsidiaries [line items]        
Name Of Share holders Syndial SpA      
% Ownership 11.58%      
In Italy [Member] | Chemical [Member] | Subsidiaries Two [Member] | Third parties [Member]        
Disclosure of subsidiaries [line items]        
Name Of Share holders Third parties      
% Ownership 57.98%      
In Italy [Member] | Chemical [Member] | Subsidiaries Two [Member] | S.E.F. Srl [Member]        
Disclosure of subsidiaries [line items]        
Name Of Share holders S.E.F. Srl      
% Ownership 10.70%      
In Italy [Member] | Chemical [Member] | Subsidiaries Three [Member]        
Disclosure of subsidiaries [line items]        
Company name [2] Matrìca SpA      
Registered office Porto Torres (SS)      
Country of operation Italy      
Share capital € 37,500,000      
Consolidation or valutation method [1] Eq.      
In Italy [Member] | Chemical [Member] | Subsidiaries Three [Member] | Versalis SpA [Member]        
Disclosure of subsidiaries [line items]        
Name Of Share holders Versalis SpA      
% Ownership 50.00%      
In Italy [Member] | Chemical [Member] | Subsidiaries Three [Member] | Third parties [Member]        
Disclosure of subsidiaries [line items]        
Name Of Share holders Third parties      
% Ownership 50.00%      
In Italy [Member] | Chemical [Member] | Subsidiaries Four [Member]        
Disclosure of subsidiaries [line items]        
Company name [2] Newco Tech SpA      
Registered office Novara      
Country of operation Italy      
Share capital € 179,000      
Consolidation or valutation method [1] Eq.      
In Italy [Member] | Chemical [Member] | Subsidiaries Four [Member] | Versalis SpA [Member]        
Disclosure of subsidiaries [line items]        
Name Of Share holders Versalis SpA      
% Ownership 80.00%      
In Italy [Member] | Chemical [Member] | Subsidiaries Four [Member] | Third parties [Member]        
Disclosure of subsidiaries [line items]        
% Ownership 20.00%      
In Italy [Member] | Chemical [Member] | Subsidiaries Four [Member] | Genomatica Inc [Member]        
Disclosure of subsidiaries [line items]        
Name Of Share holders Genomatica Inc      
In Italy [Member] | Chemical [Member] | Subsidiaries Five [Member]        
Disclosure of subsidiaries [line items]        
Company name Novamont SpA      
Registered office Novara      
Country of operation Italy      
Share capital € 13,333,500      
Consolidation or valutation method [1] Eq.      
In Italy [Member] | Chemical [Member] | Subsidiaries Five [Member] | Versalis SpA [Member]        
Disclosure of subsidiaries [line items]        
Name Of Share holders Versalis SpA      
% Ownership 25.00%      
In Italy [Member] | Chemical [Member] | Subsidiaries Five [Member] | Third parties [Member]        
Disclosure of subsidiaries [line items]        
Name Of Share holders Third parties      
% Ownership 75.00%      
In Italy [Member] | Chemical [Member] | Subsidiaries Six [Member]        
Disclosure of subsidiaries [line items]        
Company name Priolo Servizi ScpA      
Registered office Melilli (SR)      
Country of operation Italy      
Share capital € 28,100,000      
Consolidation or valutation method [1] Eq.      
In Italy [Member] | Chemical [Member] | Subsidiaries Six [Member] | Versalis SpA [Member]        
Disclosure of subsidiaries [line items]        
Name Of Share holders Versalis SpA      
% Ownership 33.11%      
In Italy [Member] | Chemical [Member] | Subsidiaries Six [Member] | Syndial SpA [Member]        
Disclosure of subsidiaries [line items]        
Name Of Share holders Syndial SpA      
% Ownership 4.61%      
In Italy [Member] | Chemical [Member] | Subsidiaries Six [Member] | Third parties [Member]        
Disclosure of subsidiaries [line items]        
Name Of Share holders Third parties      
% Ownership 62.28%      
In Italy [Member] | Chemical [Member] | Subsidiaries Seven [Member]        
Disclosure of subsidiaries [line items]        
Company name Ravenna Servizi Industriali ScpA      
Registered office Ravenna      
Country of operation Italy      
Share capital € 5,597,400      
Consolidation or valutation method [1] Eq.      
In Italy [Member] | Chemical [Member] | Subsidiaries Seven [Member] | Versalis SpA [Member]        
Disclosure of subsidiaries [line items]        
Name Of Share holders Versalis SpA      
% Ownership 42.13%      
In Italy [Member] | Chemical [Member] | Subsidiaries Seven [Member] | Eni Power SpA [Member]        
Disclosure of subsidiaries [line items]        
Name Of Share holders EniPower SpA      
% Ownership 30.37%      
In Italy [Member] | Chemical [Member] | Subsidiaries Seven [Member] | Third parties [Member]        
Disclosure of subsidiaries [line items]        
Name Of Share holders Third parties      
% Ownership 25.65%      
In Italy [Member] | Chemical [Member] | Subsidiaries Seven [Member] | Ecofuel SpA [Member]        
Disclosure of subsidiaries [line items]        
Name Of Share holders Ecofuel SpA      
% Ownership 1.85%      
In Italy [Member] | Chemical [Member] | Subsidiaries Eight [Member]        
Disclosure of subsidiaries [line items]        
Company name Servizi Porto Marghera Scarl      
Registered office Porto Marghera (VE)      
Country of operation Italy      
Share capital € 8,695,718      
Consolidation or valutation method [1] Eq.      
In Italy [Member] | Chemical [Member] | Subsidiaries Eight [Member] | Versalis SpA [Member]        
Disclosure of subsidiaries [line items]        
Name Of Share holders Versalis SpA      
% Ownership 48.44%      
In Italy [Member] | Chemical [Member] | Subsidiaries Eight [Member] | Syndial SpA [Member]        
Disclosure of subsidiaries [line items]        
Name Of Share holders Syndial SpA      
% Ownership 38.39%      
In Italy [Member] | Chemical [Member] | Subsidiaries Eight [Member] | Third parties [Member]        
Disclosure of subsidiaries [line items]        
Name Of Share holders Third parties      
% Ownership 13.17%      
Outside Italy [Member] | Chemical [Member] | Subsidiaries One [Member]        
Disclosure of subsidiaries [line items]        
Company name [2] Lotte Versalis Elastomers Co Ltd      
Registered office Yeosu  (South Korea)      
Country of operation South Korea      
Share capital | ₩     ₩ 301,800,000,000  
Consolidation or valutation method [1] Eq.      
Outside Italy [Member] | Chemical [Member] | Subsidiaries One [Member] | Versalis SpA [Member]        
Disclosure of subsidiaries [line items]        
Name Of Share holders Versalis SpA      
% Ownership 50.00%      
Outside Italy [Member] | Chemical [Member] | Subsidiaries One [Member] | Third parties [Member]        
Disclosure of subsidiaries [line items]        
Name Of Share holders Third parties      
% Ownership 50.00%      
Outside Italy [Member] | Chemical [Member] | Subsidiaries Two [Member]        
Disclosure of subsidiaries [line items]        
Company name [2] Versalis Zeal Ltd      
Registered office Takoradi  (Ghana)      
Country of operation Ghana      
Share capital | GH₵   GH₵ 5,650,000    
Consolidation or valutation method [1] Eq.      
Outside Italy [Member] | Chemical [Member] | Subsidiaries Two [Member] | Third parties [Member]        
Disclosure of subsidiaries [line items]        
Name Of Share holders Third parties      
% Ownership 20.00%      
Outside Italy [Member] | Chemical [Member] | Subsidiaries Two [Member] | Versalis Intern. SA [Member]        
Disclosure of subsidiaries [line items]        
Name Of Share holders Versalis Intern. SA      
% Ownership 80.00%      
[1] F.C. = full consolidation, J.O. = joint operation, Eq. = equity-accounted, Co. = valued at cost, F.V. = valued at fair value
[2] Jointly controlled entity.