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Guarantees, commitments and risks (Details 2) - EUR (€)
€ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Interest Rate [Member]    
Disclosure Of Contingent Liabilities Explanatory [Line Items]    
Value at risk [1] € 2,990 € 2,580
Exchange rate [Member]    
Disclosure Of Contingent Liabilities Explanatory [Line Items]    
Value at risk [1] 250 260
Top of range [member] | Interest Rate [Member]    
Disclosure Of Contingent Liabilities Explanatory [Line Items]    
Value at risk [1] 3,650 3,760
Top of range [member] | Exchange rate [Member]    
Disclosure Of Contingent Liabilities Explanatory [Line Items]    
Value at risk [1] 570 570
Bottom of range [member] | Interest Rate [Member]    
Disclosure Of Contingent Liabilities Explanatory [Line Items]    
Value at risk [1] 1,800 1,720
Bottom of range [member] | Exchange rate [Member]    
Disclosure Of Contingent Liabilities Explanatory [Line Items]    
Value at risk [1] 90 80
Average [Member] | Interest Rate [Member]    
Disclosure Of Contingent Liabilities Explanatory [Line Items]    
Value at risk [1] 2,730 2,380
Average [Member] | Exchange rate [Member]    
Disclosure Of Contingent Liabilities Explanatory [Line Items]    
Value at risk [1] € 280 € 220
[1] Value at risk deriving from interest and exchange rates exposures include the following finance department: Eni Corporate Treasury Department, Eni Finance International SA, Banque Eni SA and Eni Finance USA Inc.