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Shareholders' equity (Details 3) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of classes of share capital [abstract]        
Net Profit As Recorded in Eni Spa Financial Statements € 3,173 € 3,586    
Excess of net equity stated in the separate accounts of consolidated subsidiaries over the corresponding carrying amounts of the parent company, Net profit (134) (466)    
- difference between purchase cost and underlying carrying amounts of net equity, Net profit (1)    
- adjustments to comply with Group account policies, Net profit 862 202    
- elimination of unrealized intercompany profits, Net profit 177 (88)    
- deferred taxation, Net profit 59 144    
Net profit (loss) for the year 4,137 3,377 € (1,457)  
Non-controlling interest, Net profit (11) (3) (7)  
As recorded in Consolidated Financial Statements, Net profit 4,126 3,374 (1,464)  
As recorded in Eni SpA's Financial Statements, Shareholders' equity 42,615 42,529    
Excess of net equity stated in the separate accounts of consolidated subsidiaries over the corresponding carrying amounts of the parent company, Shareholders' equity 7,183 6,110    
- difference between purchase cost and underlying carrying amounts of net equity, Shareholders' equity 153 145    
- adjustments to comply with Group account policies, Shareholders' equity 2,000 719    
- elimination of unrealized intercompany profits, Shareholders' equity (519) (807)    
- deferred taxation, Shareholders' equity (359) (617)    
TOTAL SHAREHOLDERS' EQUITY 51,073 48,079 € 53,086 € 57,409
Non-controlling interest (57) (49)    
As recorded in Consolidated Financial Statements, Shareholders' equity € 51,016 € 48,030