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Long-term debt and current portion of long-term debt (Details Textual) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]      
Repayments of non-current borrowings € 2,973 € 2,323 € 4,466
Undrawn borrowing facilities 5,802 6,236  
Outstanding Retained undrawn long-term committed borrowing 750    
Current financial assets at fair value through profit or loss, classified as held for trading [1] 6,012 6,166  
Current financial assets available-for-sale [2] 207 238  
Non-Operating Finance Receivables 209 385  
Borrowings 24,707 27,239  
Decrease in longterm debt, new issuance 1,842    
Decrease in long term debts 1,378    
Fair value of long-term debt € 23,764 € 25,358  
Bottom Of Range [Member]      
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]      
Discount rates used to measure fair value of financial debt (0.20%) (0.20%)  
Top Of Range [Member]      
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]      
Discount rates used to measure fair value of financial debt 2.50% 2.60%  
Eni SpA [Member]      
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]      
Current financial assets at fair value through profit or loss, classified as held for trading € 5,793 € 6,062  
Citibank Europe Plc [Member]      
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]      
Bank loans received € 1,664 1,953  
Ordinary Bonds Issued [Member]      
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]      
Borrowings, maturity 2018–2043    
Ordinary bonds issued € 2,199    
Borrowings 17,965 19,003  
New Ordinary Bonds Issued 1,817    
Ordinary Bonds Issued [Member] | Eni SpA [Member]      
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]      
Ordinary bonds issued 1,795    
New Ordinary Bonds Issued 1,403    
Euro Medium Term Notes [Member]      
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]      
Borrowings 16,963    
Notional amount 20,000    
Issuance of debt notes drawn 16,800    
Other Bonds [Member]      
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]      
Borrowings 1,002    
Long-term debt and current portion of long-term debt [Member]      
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]      
Borrowings 22,465 € 23,843  
Joint Venture And Associates [Member]      
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]      
Other current financial assets 236    
Eni Finance International SA [Member] | Ordinary Bonds Issued [Member]      
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]      
Ordinary bonds issued 404    
New Ordinary Bonds Issued € 414    
[1] Income or expense were recognized in the profit and loss account within “Finance income (expense)”.
[2] In the profit and loss account, economic effects were essentially recognized as expense within “Purchase, services and other” for €933 million (expense for €840 million in 2016) (impairments net of reversal) and as expense for €25 million within “Finance income (expense)” (expense for €276 million in 2016) (exchange rate differences at year-end and amortized cost).