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Property, plant and equipment - Stratification of suspended wells (Details)
€ in Millions
Dec. 31, 2020
EUR (€)
item
Dec. 31, 2019
EUR (€)
item
Dec. 31, 2018
EUR (€)
item
Dec. 31, 2017
EUR (€)
Property, plant and equipment        
Property, plant and equipment € 53,943 € 62,192 € 60,302  
Suspended exploration wells pending final determination        
Property, plant and equipment        
Property, plant and equipment € 1,268 € 1,246 € 1,101 € 1,263
Costs capitalized and suspended for exploratory well activity, number of wells in Eni's interest | item 37.0 40.5 34.1  
Suspended exploration wells pending final determination | fields including wells drilled over the last 12 months        
Property, plant and equipment        
Property, plant and equipment € 157 € 185 € 111  
Costs capitalized and suspended for exploratory well activity, number of wells in Eni's interest | item 6.7 7.7 7.0  
Suspended exploration wells pending final determination | fields for which the delineation campaign is in progress        
Property, plant and equipment        
Property, plant and equipment € 631 € 556 € 217  
Costs capitalized and suspended for exploratory well activity, number of wells in Eni's interest | item 14.9 11.3 4.7  
Suspended exploration wells pending final determination | fields including commercial discoveries that proceeds to sanctioning        
Property, plant and equipment        
Property, plant and equipment € 480 € 505 € 773  
Costs capitalized and suspended for exploratory well activity, number of wells in Eni's interest | item 15.4 21.5 22.4  
Suspended exploration wells pending final determination | within 1 year        
Property, plant and equipment        
Property, plant and equipment € 157 € 185 € 111  
Costs capitalized and suspended for exploratory well activity, number of wells in Eni's interest | item 6.7 7.7 7.0  
Suspended exploration wells pending final determination | between 1 and 3 years        
Property, plant and equipment        
Property, plant and equipment € 250 € 171 € 87  
Costs capitalized and suspended for exploratory well activity, number of wells in Eni's interest | item 11.0 6.4 2.9  
Suspended exploration wells pending final determination | beyond 3 years        
Property, plant and equipment        
Property, plant and equipment € 861 € 890 € 903  
Costs capitalized and suspended for exploratory well activity, number of wells in Eni's interest | item 19.3 26.4 24.2