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Other information - Additional Information (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Other information      
Consideration transferred, acquisition-date fair value € 5 € 148  
Net effect of disposals 219 2,722 € 523
Cash and cash equivalents divested 24 286 9
Fair value of share capital held after the sale of control   3,498  
Fair valuation of business combination   889  
Reclassification of foreign currency translation differences among other items of comprehensive income (24) 113  
Selling price € 211 239 € 2,671
MET holding      
Other information      
Cash and cash equivalents divested   13  
Selling price   € 145  
Var Energi AS      
Other information      
Proportion of ownership interest in joint venture 69.60% 69.60%  
Eni Norge AS      
Other information      
Net effect of disposals   € 2,486  
Cash and cash equivalents divested   258  
Fair value of share capital held after the sale of control   3,498  
Fair valuation of business combination   889  
Reclassification of foreign currency translation differences among other items of comprehensive income   € 123  
Tigaz Zrt | MET holding      
Other information      
Percentage of ownership interest divested   98.99%  
Tigaz DSO | MET holding      
Other information      
Percentage of ownership interest divested   100.00%  
Lasmo sanga sanga      
Other information      
Percentage of ownership interest divested   26.25%  
Selling price   € 33  
Eni Croatia BV      
Other information      
Cash and cash equivalents divested   € 15  
Percentage of ownership interest divested   100.00%  
Selling price   € 20  
Eni Trinidad and Tobago Ltd      
Other information      
Percentage of ownership interest divested   100.00%  
Selling price   € 10  
Agip Oil Ecuador BV      
Other information      
Percentage of ownership interest divested 100.00%    
SEA SpA      
Other information      
Percentage of voting equity interests acquired 60.00%    
Petroven Srl      
Other information      
Percentage of voting equity interests acquired 32.00%    
Mossi Ghisolfi Group      
Other information      
Consideration transferred, acquisition-date fair value   75  
Gas Distribution Company of Thessaloniki Thessaly SA      
Other information      
Consideration transferred, acquisition-date fair value   € 24  
Percentage of voting equity interests acquired   51.00%  
Cash and cash equivalents in subsidiary or businesses acquired or disposed   € 28  
Mestni Plinovodi distribucija plina doo      
Other information      
Consideration transferred, acquisition-date fair value   15  
Cash and cash equivalents in subsidiary or businesses acquired or disposed   € 1