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Other information about investments (Details 15)
 12 Months Ended
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
GBP (£)
Dec. 31, 2016
EUR (€)
Disclosure of subsidiaries [line items]      
Share Capital € 4,005,000,000   € 4,005,000,000
Corporate And Other Activities [Member] | Eni SpA [Member]      
Disclosure of subsidiaries [line items]      
% Ownership 10.08%    
Italy [Member] | Corporate And Other Activities [Member] | Subsidiaries [Member]      
Disclosure of subsidiaries [line items]      
Company name Emittenti Titoli SpA (in liquidation)    
Registered office Milan    
Country of operation Italy    
Share Capital € 4,264,000    
Consolidation or valutation method [1] Co.    
Italy [Member] | Corporate And Other Activities [Member] | Subsidiaries [Member] | Eni SpA [Member]      
Disclosure of subsidiaries [line items]      
Shareholders Eni SpA    
% Ownership [2] 10.00%    
Italy [Member] | Corporate And Other Activities [Member] | Subsidiaries [Member] | Emittenti Titoli SpA (L) [Member]      
Disclosure of subsidiaries [line items]      
Shareholders Emittenti Titoli SpA (L)    
% Ownership 0.78%    
Italy [Member] | Corporate And Other Activities [Member] | Subsidiaries [Member] | Third parties [Member]      
Disclosure of subsidiaries [line items]      
Shareholders Third parties    
% Ownership 89.22%    
Outside Italy [Member] | Corporate And Other Activities [Member] | Subsidiaries [Member]      
Disclosure of subsidiaries [line items]      
Company name OGCI Climate Investments Llp    
Registered office London (United Kingdom)    
Country of operation United Kingdom    
Share Capital | £ [3]   £ 0  
Consolidation or valutation method [1] Co.    
Outside Italy [Member] | Corporate And Other Activities [Member] | Subsidiaries [Member] | Third parties [Member]      
Disclosure of subsidiaries [line items]      
Shareholders Third parties    
% Ownership 85.71%    
Outside Italy [Member] | Corporate And Other Activities [Member] | Subsidiaries [Member] | Eni UK Ltd [Member]      
Disclosure of subsidiaries [line items]      
Shareholders Eni UK Ltd    
% Ownership 14.29%    
[1] Jointly controlled entity.
[2] Controlling interest: Eni SpA 10.08 Third parties 89.92
[3] Shares without nominal value.