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Other information about investments (Details 10) | 12 Months Ended |  |
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Dec. 31, 2017 EUR (€) | Dec. 31, 2017 GHS (GH₵) | Dec. 31, 2017 KRW (₩) | Dec. 31, 2016 EUR (€)
Disclosure of subsidiaries [line items] |  |  |  |  |
Share capital |  | € 4,005,000,000 |  |  | € 4,005,000,000
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. |  |  |
Italy [Member] | Chemical [Member] | Subsidiaries One [Member] | Versalis SpA [Member] |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Shareholders |  | Versalis SpA |  |  |
% Ownership |  | 49.00% |  |  |
Italy [Member] | Chemical [Member] | Subsidiaries One [Member] | Syndial SpA [Member] |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Shareholders |  | Syndial SpA |  |  |
% Ownership |  | 20.20% |  |  |
Italy [Member] | Chemical [Member] | Subsidiaries One [Member] | EniPower SpA [Member] |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Shareholders |  | EniPower SpA |  |  |
% Ownership |  | 8.90% |  |  |
Italy [Member] | Chemical [Member] | Subsidiaries One [Member] | Third parties [Member] |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Shareholders |  | Third parties |  |  |
% Ownership |  | 21.90% |  |  |
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. |  |  |
Italy [Member] | Chemical [Member] | Subsidiaries Two [Member] | Versalis SpA [Member] |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Shareholders |  | Versalis SpA |  |  |
% Ownership |  | 19.74% |  |  |
Italy [Member] | Chemical [Member] | Subsidiaries Two [Member] | Syndial SpA [Member] |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Shareholders |  | Syndial SpA |  |  |
% Ownership |  | 11.58% |  |  |
Italy [Member] | Chemical [Member] | Subsidiaries Two [Member] | Third parties [Member] |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Shareholders |  | Third parties |  |  |
% Ownership |  | 57.98% |  |  |
Italy [Member] | Chemical [Member] | Subsidiaries Two [Member] | S.E.F. Srl [Member] |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Shareholders |  | S.E.F. Srl |  |  |
% Ownership |  | 10.70% |  |  |
Italy [Member] | Chemical [Member] | Subsidiaries Three [Member] |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Company name | [1] | Matrìca SpA(†) |  |  |
Registered office |  | Porto Torres (SS) |  |  |
Country of operation |  | Italy |  |  |
Share capital |  | € 37,500,000 |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |
Italy [Member] | Chemical [Member] | Subsidiaries Three [Member] | Versalis SpA [Member] |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Shareholders |  | Versalis SpA |  |  |
% Ownership |  | 50.00% |  |  |
Italy [Member] | Chemical [Member] | Subsidiaries Three [Member] | Third parties [Member] |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Shareholders |  | Third parties |  |  |
% Ownership |  | 50.00% |  |  |
Italy [Member] | Chemical [Member] | Subsidiaries Four [Member] |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Company name | [1] | Newco Tech SpA(†) |  |  |
Registered office |  | Novara |  |  |
Country of operation |  | Italy |  |  |
Share capital |  | € 179,000 |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |
Italy [Member] | Chemical [Member] | Subsidiaries Four [Member] | Versalis SpA [Member] |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Shareholders |  | Versalis SpA |  |  |
% Ownership |  | 80.00% |  |  |
Italy [Member] | Chemical [Member] | Subsidiaries Four [Member] | Genomatica Inc [Member] |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Shareholders |  | Genomatica Inc |  |  |
% Ownership |  | 20.00% |  |  |
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. |  |  |
Italy [Member] | Chemical [Member] | Subsidiaries Five [Member] | Versalis SpA [Member] |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Shareholders |  | Versalis SpA |  |  |
% Ownership |  | 25.00% |  |  |
Italy [Member] | Chemical [Member] | Subsidiaries Five [Member] | Third parties [Member] |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Shareholders |  | Third parties |  |  |
% Ownership |  | 75.00% |  |  |
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. |  |  |
Italy [Member] | Chemical [Member] | Subsidiaries Six [Member] | Versalis SpA [Member] |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Shareholders |  | Versalis SpA |  |  |
% Ownership |  | 33.11% |  |  |
Italy [Member] | Chemical [Member] | Subsidiaries Six [Member] | Syndial SpA [Member] |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Shareholders |  | Syndial SpA |  |  |
% Ownership |  | 4.61% |  |  |
Italy [Member] | Chemical [Member] | Subsidiaries Six [Member] | Third parties [Member] |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Shareholders |  | Third parties |  |  |
% Ownership |  | 62.28% |  |  |
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. |  |  |
Italy [Member] | Chemical [Member] | Subsidiaries Seven [Member] | Versalis SpA [Member] |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Shareholders |  | Versalis SpA |  |  |
% Ownership |  | 42.13% |  |  |
Italy [Member] | Chemical [Member] | Subsidiaries Seven [Member] | EniPower SpA [Member] |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Shareholders |  | EniPower SpA |  |  |
% Ownership |  | 30.37% |  |  |
Italy [Member] | Chemical [Member] | Subsidiaries Seven [Member] | Third parties [Member] |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Shareholders |  | Third parties |  |  |
% Ownership |  | 25.65% |  |  |
Italy [Member] | Chemical [Member] | Subsidiaries Seven [Member] | Ecofuel SpA [Member] |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Shareholders |  | Ecofuel SpA |  |  |
% Ownership |  | 1.85% |  |  |
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. |  |  |
Italy [Member] | Chemical [Member] | Subsidiaries Eight [Member] | Versalis SpA [Member] |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Shareholders |  | Versalis SpA |  |  |
% Ownership |  | 48.44% |  |  |
Italy [Member] | Chemical [Member] | Subsidiaries Eight [Member] | Syndial SpA [Member] |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Shareholders |  | Syndial SpA |  |  |
% Ownership |  | 38.39% |  |  |
Italy [Member] | Chemical [Member] | Subsidiaries Eight [Member] | Third parties [Member] |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Shareholders |  | Third parties |  |  |
% Ownership |  | 13.17% |  |  |
Outside Italy [Member] | Chemical [Member] | Subsidiaries One [Member] |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Company name | [1] | 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] |  |  |  |  |
Shareholders |  | Versalis SpA |  |  |
% Ownership |  | 50.00% |  |  |
Outside Italy [Member] | Chemical [Member] | Subsidiaries One [Member] | Third parties [Member] |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Shareholders |  | Third parties |  |  |
% Ownership |  | 50.00% |  |  |
Outside Italy [Member] | Chemical [Member] | Subsidiaries Two [Member] |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Company name | [1] | 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] |  |  |  |  |
Shareholders |  | Third parties |  |  |
% Ownership |  | 20.00% |  |  |
Outside Italy [Member] | Chemical [Member] | Subsidiaries Two [Member] | Versalis Intern. SA [Member] |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Shareholders |  | Versalis Intern. SA |  |  |
% Ownership |  | 80.00% |  |  |
[1] | Jointly controlled entity.

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