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Other information - Additional Information (Details)
€ in Millions
12 Months Ended
Dec. 31, 2020
EUR (€)
project
company
Dec. 31, 2019
EUR (€)
Dec. 31, 2018
EUR (€)
Other information      
Consideration transferred, acquisition-date fair value € 112 € 5 € 148
Net effect of disposals   219 2,722
Cash and cash equivalents divested   24 286
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
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 69.85%   69.60%
Agip Oil Ecuador BV      
Other information      
Percentage of ownership interest divested   100.00%  
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      
Percentage of ownership interest divested     100.00%
Cash and cash equivalents divested     € 15
Selling price     € 20
Eni Trinidad and Tobago Ltd      
Other information      
Percentage of ownership interest divested     100.00%
Selling price     € 10
Evolvere      
Other information      
Percentage of voting equity interests acquired 70.00%    
Consideration transferred, acquisition-date fair value € 97    
Cash and cash equivalents in subsidiary or businesses acquired or disposed 3    
Companies holding authorization rights for wind projects      
Other information      
Consideration transferred, acquisition-date fair value € 12    
Number of companies acquired | company 3    
Number of wind projects to be constructed in Puglia | project 3    
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      
Percentage of voting equity interests acquired     51.00%
Consideration transferred, acquisition-date fair value     € 24
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