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Shareholders’ equity (Details 3) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of classes of share capital [abstract]        
Net Profit As Recorded in Eni Spa Financial Statements € 3,586 € 4,521    
Excess of net equity stated in the separate accounts of consolidated subsidiaries over the corresponding carrying amounts of the parent company, Net profit (466) (5,480)    
- difference between purchase cost and underlying carrying amounts of net equity, Net profit (1) (44)    
- adjustments to comply with Group account policies, Net profit 202 (188)    
- elimination of unrealized intercompany profits, Net profit (88) (56)    
- deferred taxation, Net profit 144 (210)    
Net profit 3,377 (1,457) € (9,373)  
Non-controlling interest, Net profit 3 7 (595)  
As recorded in Consolidated Financial Statements, Net profit 3,374 (1,464) (8,778)  
As recorded in Eni SpA's Financial Statements, Shareholders' equity 42,529 41,935    
Excess of net equity stated in the separate accounts of consolidated subsidiaries over the corresponding carrying amounts of the parent company, Shareholders' equity 6,110 12,384    
- difference between purchase cost and underlying carrying amounts of net equity, Shareholders' equity 145 240    
- adjustments to comply with Group account policies, Shareholders' equity 719 461    
- elimination of unrealized intercompany profits, Shareholders' equity (807) (801)    
- deferred taxation, Shareholders' equity (617) (1,133)    
Total Shareholders' Equity 48,079 53,086 € 57,409 € 65,641
Non-controlling interest, Shareholders' equity (49) (49)    
As recorded in Consolidated Financial Statements, Shareholders' equity € 48,030 € 53,037