XML 266 R259.htm IDEA: XBRL DOCUMENT v3.8.0.1
Other information about investments (Details 6)
 12 Months Ended
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
GBP (£)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
EGP (ج.م.)
Dec. 31, 2017
CHF (SFr)
Dec. 31, 2016
EUR (€)
Disclosure of subsidiaries [line items]            
Share capital € 4,005,000,000         € 4,005,000,000
Italy [Member] | Corporate and financial companies [Member] | Subsidiaries One [Member]            
Disclosure of subsidiaries [line items]            
Company name Agenzia Giornalistica Italia SpA          
Registered office Rome          
Country of operation Italy          
Share capital € 2,000,000          
Shareholders Eni SpA          
% Ownership 100.00%          
% Equity ratio 100.00%          
Consolidation or valutation method [1] F.C.          
Italy [Member] | Corporate and financial companies [Member] | Subsidiaries Two [Member]            
Disclosure of subsidiaries [line items]            
Company name Eni Adfin SpA          
Registered office Rome          
Country of operation Italy          
Share capital € 85,537,498.8          
% Equity ratio 99.67%          
Consolidation or valutation method [1] F.C.          
Italy [Member] | Corporate and financial companies [Member] | Subsidiaries Two [Member] | Eni SpA [Member]            
Disclosure of subsidiaries [line items]            
Shareholders Eni SpA          
% Ownership 99.67%          
Italy [Member] | Corporate and financial companies [Member] | Subsidiaries Two [Member] | Third parties [Member]            
Disclosure of subsidiaries [line items]            
Shareholders Third parties          
% Ownership 0.33%          
Italy [Member] | Corporate and financial companies [Member] | Subsidiaries Three [Member]            
Disclosure of subsidiaries [line items]            
Company name Eni Corporate University SpA          
Registered office San Donato Milanese (MI)          
Country of operation Italy          
Share capital € 3,360,000          
Shareholders Eni SpA          
% Ownership 100.00%          
% Equity ratio 100.00%          
Consolidation or valutation method [1] F.C.          
Italy [Member] | Corporate and financial companies [Member] | Subsidiaries Four [Member]            
Disclosure of subsidiaries [line items]            
Company name EniServizi SpA          
Registered office San Donato Milanese (MI)          
Country of operation Italy          
Share capital € 13,427,419.08          
Shareholders Eni SpA          
% Ownership 100.00%          
% Equity ratio 100.00%          
Consolidation or valutation method [1] F.C.          
Italy [Member] | Corporate and financial companies [Member] | Subsidiaries Five [Member]            
Disclosure of subsidiaries [line items]            
Company name Serfactoring SpA          
Registered office San Donato Milanese (MI)          
Country of operation Italy          
Share capital € 5,160,000          
% Equity ratio 49.00%          
Consolidation or valutation method [1] F.C.          
Italy [Member] | Corporate and financial companies [Member] | Subsidiaries Five [Member] | Eni SpA [Member]            
Disclosure of subsidiaries [line items]            
Shareholders Eni SpA          
% Ownership 49.00%          
Italy [Member] | Corporate and financial companies [Member] | Subsidiaries Five [Member] | Third parties [Member]            
Disclosure of subsidiaries [line items]            
Shareholders Third parties          
% Ownership 51.00%          
Italy [Member] | Corporate and financial companies [Member] | Subsidiaries Six [Member]            
Disclosure of subsidiaries [line items]            
Company name Servizi Aerei SpA          
Registered office San Donato Milanese (MI)          
Country of operation Italy          
Share capital € 79,817,238          
Shareholders Eni SpA          
% Ownership 100.00%          
% Equity ratio 100.00%          
Consolidation or valutation method [1] F.C.          
Italy [Member] | Other Activities [Member] | Subsidiaries One [Member]            
Disclosure of subsidiaries [line items]            
Company name Anic Partecipazioni SpA (in liquidation)          
Registered office Gela (CL)          
Country of operation Italy          
Share capital € 23,519,847.16          
Consolidation or valutation method [1] Eq.          
Italy [Member] | Other Activities [Member] | Subsidiaries One [Member] | Third parties [Member]            
Disclosure of subsidiaries [line items]            
Shareholders Third parties          
% Ownership 0.03%          
Italy [Member] | Other Activities [Member] | Subsidiaries One [Member] | Syndial SpA [Member]            
Disclosure of subsidiaries [line items]            
Shareholders Syndial SpA          
% Ownership 99.97%          
Italy [Member] | Other Activities [Member] | Subsidiaries Two [Member]            
Disclosure of subsidiaries [line items]            
Company name Eni Energia Srl          
Registered office San Donato Milanese (MI)          
Country of operation Italy          
Share capital € 10,000          
Shareholders Eni SpA          
% Ownership 100.00%          
Consolidation or valutation method [1] Co.          
Italy [Member] | Other Activities [Member] | Subsidiaries Three [Member]            
Disclosure of subsidiaries [line items]            
Company name Eni New Energy SpA          
Registered office San Donato Milanese (MI)          
Country of operation Italy          
Share capital € 5,000,000          
Shareholders Eni SpA          
% Ownership 100.00%          
% Equity ratio 100.00%          
Consolidation or valutation method [1] F.C.          
Italy [Member] | Other Activities [Member] | Subsidiaries Four [Member]            
Disclosure of subsidiaries [line items]            
Company name Industria Siciliana Acido Fosforico - ISAF - SpA (in liquidation)          
Registered office Gela (CL)          
Country of operation Italy          
Share capital € 1,300,000          
Consolidation or valutation method [1] Eq.          
Italy [Member] | Other Activities [Member] | Subsidiaries Four [Member] | Third parties [Member]            
Disclosure of subsidiaries [line items]            
Shareholders Third parties          
% Ownership 48.00%          
Italy [Member] | Other Activities [Member] | Subsidiaries Four [Member] | Syndial SpA [Member]            
Disclosure of subsidiaries [line items]            
Shareholders Syndial SpA          
% Ownership 52.00%          
Italy [Member] | Other Activities [Member] | Subsidiaries Five [Member]            
Disclosure of subsidiaries [line items]            
Company name Ing. Luigi Conti Vecchi SpA          
Registered office Assemini (CA)          
Country of operation Italy          
Share capital € 5,518,620.64          
Shareholders Syndial SpA          
% Ownership 100.00%          
% Equity ratio 100.00%          
Consolidation or valutation method [1] F.C.          
Italy [Member] | Other Activities [Member] | Subsidiaries Six [Member]            
Disclosure of subsidiaries [line items]            
Company name Syndial Servizi Ambientali SpA          
Registered office San Donato Milanese (MI)          
Country of operation Italy          
Share capital € 424,818,703.05          
% Equity ratio 100.00%          
Consolidation or valutation method [1] F.C.          
Italy [Member] | Other Activities [Member] | Subsidiaries Six [Member] | Eni SpA [Member]            
Disclosure of subsidiaries [line items]            
Shareholders Eni SpA          
% Ownership 99.99%          
Italy [Member] | Other Activities [Member] | Subsidiaries Six [Member] | Third parties [Member]            
Disclosure of subsidiaries [line items]            
Shareholders Third parties          
% Ownership 0.01%          
Outside Italy [Member] | Corporate and financial companies [Member] | Subsidiaries One [Member]            
Disclosure of subsidiaries [line items]            
Company name Banque Eni SA          
Registered office Bruxelles (Belgium)          
Country of operation Belgium          
Share capital € 50,000,000          
% Equity ratio 100.00%          
Consolidation or valutation method [1] F.C.          
Outside Italy [Member] | Corporate and financial companies [Member] | Subsidiaries One [Member] | Eni International BV [Member]            
Disclosure of subsidiaries [line items]            
Shareholders Eni International BV          
% Ownership 99.90%          
Outside Italy [Member] | Corporate and financial companies [Member] | Subsidiaries One [Member] | Eni Oil Holdings BV [Member]            
Disclosure of subsidiaries [line items]            
Shareholders Eni Oil Holdings BV          
% Ownership 0.10%          
Outside Italy [Member] | Corporate and financial companies [Member] | Subsidiaries Two [Member]            
Disclosure of subsidiaries [line items]            
Company name Eni Finance International SA          
Registered office Bruxelles (Belgium)          
Country of operation Belgium          
Share capital | $     $ 2,474,225,632      
% Equity ratio 100.00%          
Consolidation or valutation method [1] F.C.          
Outside Italy [Member] | Corporate and financial companies [Member] | Subsidiaries Two [Member] | Eni SpA [Member]            
Disclosure of subsidiaries [line items]            
Shareholders Eni SpA          
% Ownership 33.61%          
Outside Italy [Member] | Corporate and financial companies [Member] | Subsidiaries Two [Member] | Eni International BV [Member]            
Disclosure of subsidiaries [line items]            
Shareholders Eni International BV          
% Ownership 66.39%          
Outside Italy [Member] | Corporate and financial companies [Member] | Subsidiaries Three [Member]            
Disclosure of subsidiaries [line items]            
Company name Eni Finance USA Inc          
Registered office Dover, Delaware (USA)          
Country of operation USA          
Share capital | $     $ 15,000,000      
Shareholders Eni Petroleum Co Inc          
% Ownership 100.00%          
% Equity ratio 100.00%          
Consolidation or valutation method [1] F.C.          
Outside Italy [Member] | Corporate and financial companies [Member] | Subsidiaries Four [Member]            
Disclosure of subsidiaries [line items]            
Company name Eni Insurance Designated Activity Company          
Registered office Dublin (Ireland)          
Country of operation Ireland          
Share capital € 500,000,000          
Shareholders Eni SpA          
% Ownership 100.00%          
% Equity ratio 100.00%          
Consolidation or valutation method [1] F.C.          
Outside Italy [Member] | Corporate and financial companies [Member] | Subsidiaries Five [Member]            
Disclosure of subsidiaries [line items]            
Company name Eni International BV          
Registered office Amsterdam (Netherlands)          
Country of operation Netherlands          
Share capital € 641,683,425          
Shareholders Eni SpA          
% Ownership 100.00%          
% Equity ratio 100.00%          
Consolidation or valutation method [1] F.C.          
Outside Italy [Member] | Corporate and financial companies [Member] | Subsidiaries Six [Member]            
Disclosure of subsidiaries [line items]            
Company name Eni International Resources Ltd          
Registered office London (United Kingdom)          
Country of operation United Kingdom          
Share capital | £   £ 50,000        
% Equity ratio 100.00%          
Consolidation or valutation method [1] F.C.          
Outside Italy [Member] | Corporate and financial companies [Member] | Subsidiaries Six [Member] | Eni SpA [Member]            
Disclosure of subsidiaries [line items]            
Shareholders Eni SpA          
% Ownership 99.99%          
Outside Italy [Member] | Corporate and financial companies [Member] | Subsidiaries Six [Member] | Eni UK Ltd [Member]            
Disclosure of subsidiaries [line items]            
Shareholders Eni UK Ltd          
% Ownership 0.01%          
Outside Italy [Member] | Other Activities [Member] | Subsidiaries One [Member]            
Disclosure of subsidiaries [line items]            
Company name Eni New Energy Egypt SAE          
Registered office Cairo (Egypt)          
Country of operation Egypt          
Share capital | ج.م.       ج.م. 250,000    
Consolidation or valutation method [1] Eq.          
Outside Italy [Member] | Other Activities [Member] | Subsidiaries One [Member] | Eni International BV [Member]            
Disclosure of subsidiaries [line items]            
Shareholders Eni International BV          
% Ownership 99.98%          
Outside Italy [Member] | Other Activities [Member] | Subsidiaries One [Member] | Ieoc Exploration BV [Member]            
Disclosure of subsidiaries [line items]            
Shareholders Ieoc Exploration BV          
% Ownership 0.01%          
Outside Italy [Member] | Other Activities [Member] | Subsidiaries One [Member] | Ieoc Production BV [Member]            
Disclosure of subsidiaries [line items]            
Shareholders Ieoc Production BV          
% Ownership 0.01%          
Outside Italy [Member] | Other Activities [Member] | Subsidiaries Two [Member]            
Disclosure of subsidiaries [line items]            
Company name Oleodotto del Reno SA          
Registered office Coira (Switzerland)          
Country of operation Switzerland          
Share capital | SFr         SFr 1,550,000  
Shareholders Syndial SpA          
% Ownership 100.00%          
Consolidation or valutation method [1] Eq.          
[1] Jointly controlled entity.