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Other information about investments (Details 5) | 12 Months Ended |  |
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Dec. 31, 2017 EUR (€) | Dec. 31, 2017 GBP (£) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CDF (CF) | Dec. 31, 2017 HUF (Ft) | Dec. 31, 2017 SGD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 INR (₨) | Dec. 31, 2017 TRY (₺) | Dec. 31, 2016 EUR (€)
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |
Share capital |  | € 4,005,000,000 |  |  |  |  |  |  |  |  | € 4,005,000,000
Italy [Member] | Chemical [Member] | Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | Versalis SpA |  |  |  |  |  |  |  |  |
Registered office |  | San Donato Milanese (MI) |  |  |  |  |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |  |  |  |
Italy [Member] | Chemical [Member] | Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |
Share capital |  | € 1,364,790,000 |  |  |  |  |  |  |  |  |
Italy [Member] | Chemical [Member] | Subsidiaries One [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | Consorzio Industriale Gas Naturale (in liquidation) |  |  |  |  |  |  |  |  |
Registered office |  | San Donato Milanese (MI) |  |  |  |  |  |  |  |  |
Country of operation |  | Italy |  |  |  |  |  |  |  |  |
Share capital |  | € 124,000 |  |  |  |  |  |  |  |  |
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 |  | 53.55% |  |  |  |  |  |  |  |  |
Italy [Member] | Chemical [Member] | Subsidiaries One [Member] | Raff. di Gela SpA [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Raff. di Gela SpA |  |  |  |  |  |  |  |  |
% Ownership |  | 18.74% |  |  |  |  |  |  |  |  |
Italy [Member] | Chemical [Member] | Subsidiaries One [Member] | Eni SpA [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Eni SpA |  |  |  |  |  |  |  |  |
% Ownership |  | 15.37% |  |  |  |  |  |  |  |  |
Italy [Member] | Chemical [Member] | Subsidiaries One [Member] | Syndial SpA [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Syndial SpA |  |  |  |  |  |  |  |  |
% Ownership |  | 0.76% |  |  |  |  |  |  |  |  |
Italy [Member] | Chemical [Member] | Subsidiaries One [Member] | Raff. Milazzo ScpA [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Raff. Milazzo ScpA |  |  |  |  |  |  |  |  |
% Ownership |  | 11.58% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemical [Member] | Subsidiaries One [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | Dunastyr Polisztirolgyártó Zártkörûen Mûködõ Részvénytársaság |  |  |  |  |  |  |  |  |
Registered office |  | Budapest (Hungary) |  |  |  |  |  |  |  |  |
Country of operation |  | Hungary |  |  |  |  |  |  |  |  |
Share capital | Ft |  |  |  |  |  | Ft 8,092,160,000 |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemical [Member] | Subsidiaries One [Member] | Versalis SpA [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Versalis SpA |  |  |  |  |  |  |  |  |
% Ownership |  | 96.34% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemical [Member] | Subsidiaries One [Member] | Versalis Deutsc.GmbH [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Versalis Deutsc.GmbH |  |  |  |  |  |  |  |  |
% Ownership |  | 1.83% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemical [Member] | Subsidiaries One [Member] | Versalis Int.SA [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Versalis Int.SA |  |  |  |  |  |  |  |  |
% Ownership |  | 1.83% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemical [Member] | Subsidiaries Two [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | Eni Chemicals Trading (Shanghai) Co Ltd (in liquidation) |  |  |  |  |  |  |  |  |
Registered office |  | Shanghai (China) |  |  |  |  |  |  |  |  |
Country of operation |  | China |  |  |  |  |  |  |  |  |
Share capital | $ |  |  |  | $ 5,000,000 |  |  |  |  |  |  |
Shareholders |  | Versalis SpA |  |  |  |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemical [Member] | Subsidiaries Three [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | Versalis Americas Inc |  |  |  |  |  |  |  |  |
Registered office |  | Dover, Delaware (USA) |  |  |  |  |  |  |  |  |
Country of operation |  | USA |  |  |  |  |  |  |  |  |
Share capital | $ |  |  |  | $ 100,000 |  |  |  |  |  |  |
Shareholders |  | Versalis International SA |  |  |  |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemical [Member] | Subsidiaries Four [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | Versalis Congo Sarlu |  |  |  |  |  |  |  |  |
Registered office |  | Pointe-Noire (Republic of the Congo) |  |  |  |  |  |  |  |  |
Country of operation |  | Republic of the Congo |  |  |  |  |  |  |  |  |
Share capital | CF |  |  |  |  | CF 1,000,000 |  |  |  |  |  |
Shareholders |  | Versalis International SA |  |  |  |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemical [Member] | Subsidiaries Five [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | Versalis Deutschland GmbH |  |  |  |  |  |  |  |  |
Registered office |  | Eschborn (Germany) |  |  |  |  |  |  |  |  |
Country of operation |  | Germany |  |  |  |  |  |  |  |  |
Share capital |  | € 100,000 |  |  |  |  |  |  |  |  |
Shareholders |  | Versalis SpA |  |  |  |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemical [Member] | Subsidiaries Six [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | Versalis France SAS |  |  |  |  |  |  |  |  |
Registered office |  | Mardyck (France) |  |  |  |  |  |  |  |  |
Country of operation |  | France |  |  |  |  |  |  |  |  |
Share capital |  | € 126,115,582.9 |  |  |  |  |  |  |  |  |
Shareholders |  | Versalis SpA |  |  |  |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemical [Member] | Subsidiaries Seven [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | Versalis International SA |  |  |  |  |  |  |  |  |
Registered office |  | Bruxelles (Belgium) |  |  |  |  |  |  |  |  |
Country of operation |  | Belgium |  |  |  |  |  |  |  |  |
Share capital |  | € 15,449,173.88 |  |  |  |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemical [Member] | Subsidiaries Seven [Member] | Versalis SpA [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Versalis SpA |  |  |  |  |  |  |  |  |
% Ownership |  | 59.00% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemical [Member] | Subsidiaries Seven [Member] | Versalis Deutsc.GmbH [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Versalis Deutsc.GmbH |  |  |  |  |  |  |  |  |
% Ownership |  | 23.71% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemical [Member] | Subsidiaries Seven [Member] | Dunastyr Zrt [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Dunastyr Zrt |  |  |  |  |  |  |  |  |
% Ownership |  | 14.43% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemical [Member] | Subsidiaries Seven [Member] | Versalis France [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Versalis France |  |  |  |  |  |  |  |  |
% Ownership |  | 2.86% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemical [Member] | Subsidiaries Eight [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | Versalis Kimya Ticaret Limited Sirketi |  |  |  |  |  |  |  |  |
Registered office |  | Istanbul (Turkey) |  |  |  |  |  |  |  |  |
Country of operation |  | Turkey |  |  |  |  |  |  |  |  |
Share capital | ₺ |  |  |  |  |  |  |  |  |  | ₺ 20,000 |
Shareholders |  | Versalis Int.SA |  |  |  |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemical [Member] | Subsidiaries Nine [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | Versalis Pacific (India) Private Ltd |  |  |  |  |  |  |  |  |
Registered office |  | Mumbai (India) |  |  |  |  |  |  |  |  |
Country of operation |  | India |  |  |  |  |  |  |  |  |
Share capital | ₨ |  |  |  |  |  |  |  |  | ₨ 238,700 |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemical [Member] | Subsidiaries Nine [Member] | Versalis Pacific Trading [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Versalis Pacific Trading |  |  |  |  |  |  |  |  |
% Ownership |  | 99.99% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemical [Member] | Subsidiaries Nine [Member] | Third parties [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |
Shareholders |  | Third parties |  |  |  |  |  |  |  |  |
% Ownership |  | 0.01% |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemical [Member] | Subsidiaries Ten [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | Versalis Pacific Trading (Shanghai) Co Ltd |  |  |  |  |  |  |  |  |
Registered office |  | Shanghai (China) |  |  |  |  |  |  |  |  |
Country of operation |  | China |  |  |  |  |  |  |  |  |
Share capital | ¥ |  |  |  |  |  |  |  | ¥ 1,000,000 |  |  |
Shareholders |  | Versalis SpA |  |  |  |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemical [Member] | Subsidiaries Eleven [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | Versalis Singapore Pte Ltd |  |  |  |  |  |  |  |  |
Registered office |  | Singapore (Singapore) |  |  |  |  |  |  |  |  |
Country of operation |  | Singapore |  |  |  |  |  |  |  |  |
Share capital | $ |  |  |  |  |  |  | $ 80,000 |  |  |  |
Shareholders |  | Versalis SpA |  |  |  |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | Eq. |  |  |  |  |  |  |  |  |
Outside Italy [Member] | Chemical [Member] | Subsidiaries Twelve [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |
Company name |  | Versalis UK Ltd |  |  |  |  |  |  |  |  |
Registered office |  | London (United Kingdom) |  |  |  |  |  |  |  |  |
Country of operation |  | United Kingdom |  |  |  |  |  |  |  |  |
Share capital | £ |  |  | £ 4,004,042 |  |  |  |  |  |  |  |
Shareholders |  | Versalis SpA |  |  |  |  |  |  |  |  |
% Ownership |  | 100.00% |  |  |  |  |  |  |  |  |
% Equity ratio |  | 100.00% |  |  |  |  |  |  |  |  |
Consolidation or valutation method | [1] | F.C. |  |  |  |  |  |  |  |  |
[1] | Jointly controlled entity.

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