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Short-term debt (Details Textual) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
DisclosureOfShorttermDebtLineItems [Line Items]      
Decrease In Current Borrowings € 1,154    
Cash flows from (used in) increase (decrease) in current borrowings (581) € (2,645) € 3,216
Foreign exchange gain (loss) (905) 676 € (354)
Current commercial papers issued and current portion of non-current commercial papers issued 1,664 2,738  
Undrawn borrowing facilities 5,802 6,236  
Eni Finance USA Inc [Member]      
DisclosureOfShorttermDebtLineItems [Line Items]      
Current commercial papers issued and current portion of non-current commercial papers issued 1,070 1,750  
Eni Finance International SA [Member]      
DisclosureOfShorttermDebtLineItems [Line Items]      
Current commercial papers issued and current portion of non-current commercial papers issued 594 € 988  
Euro Reporting Subsidiaries [Member]      
DisclosureOfShorttermDebtLineItems [Line Items]      
Foreign exchange gain (loss) € 574    
Short-Term Debt [Member]      
DisclosureOfShorttermDebtLineItems [Line Items]      
Borrowings, interest rate 1.30% 0.90%  
Credit Facility One [Member]      
DisclosureOfShorttermDebtLineItems [Line Items]      
Undrawn borrowing facilities € 11,584 € 12,267