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Costs (Details Textual)
 12 Months Ended
Dec. 31, 2017
EUR (€)
Dec. 31, 2016
EUR (€)
Dec. 31, 2015
EUR (€)
shares
Number
DisclosureOfOperatingExpensesLineItems [Line Items]      
Research and development expense € 185,000,000 € 161,000,000 € 176,000,000
Royalty expense 674,000,000 572,000,000 865,000,000
Minimum operating lease payments recognised as expense 1,022,000,000 566,000,000 635,000,000
Other expenses, by nature 1,844,000,000 1,512,000,000 1,135,000,000
Net provisions for contingencies 886,000,000 505,000,000 644,000,000
Provisions For Redundancy Incentives 18,000,000 47,000,000 31,000,000
Post-employment benefit expense, defined contribution plans 90,000,000 83,000,000 86,000,000
Directors' remuneration expense 14,500,000 7,100,000 6,700,000
Key management personnel compensation 43,000,000 44,000,000 42,000,000
Auditor's remuneration 760,000 738,000 551,000
Trading Net Income 44,000,000 36,000,000 471,000,000
Production Net Loss   19,000,000 16,000,000
Additional allowance recognised in profit or loss, allowance account for credit losses of financial assets 927,000,000    
Contingent rents recognised as expense 2,114,000,000    
Minimum finance lease payments payable 2,280,000,000    
Provision for credit commitments [member]      
DisclosureOfOperatingExpensesLineItems [Line Items]      
Net provisions for contingencies 375,000,000 55,000,000 179,000,000
Environmental liabilities [Member]      
DisclosureOfOperatingExpensesLineItems [Line Items]      
Net provisions for contingencies 200,000,000 198,000,000 232,000,000
Payroll and related costs [Member ]      
DisclosureOfOperatingExpensesLineItems [Line Items]      
Other Costs 162,000,000 202,000,000 € 182,000,000
Number of instruments granted in share based payment arrangement | Number     11,000,000
Share-based payment arrangement, vesting term     three-year
Description of vesting requirements for share based payment arrangement     The number of shares that will be granted at the end of the vesting period is conditioned on a 50–50 basis to actual results of two performance parameters against preset targets: (i) a market condition in terms of Total Shareholder Return (TSR) of the Eni share compared to the TSR of the FTSE Mib index of the Italian Stock Exchange Market, and to a group of Eni’s competitors (“Peers Group”)24 and the TSR of their corresponding stock exchange market25; and (ii) growth in the Net Present Value (NPV) of proved reserves benchmarked against the Peer Group.
Share-based payment arrangement, vesting range     0% and 180%
Percentage of shares vest subject to lock-up clause of one year after vesting date     50.00%
Number Of Share Options Granted In Share based Payment Arrangement | shares     1,719,061
Weighted Average Exercise Price Of Share Options Granted In Share based Payment Arrangement     € 7,990,000
Weighted Average Share Price Share Options Granted     € 13,810,000
Expected Dividend As Percentage Share Options Granted     5.79%
Description Of Expected Volatility Share Options Granted     25.12%
Expense From Share based Payment Transactions With Employees     € 400,000
Exploration Production Segment [Member] | Geological and geophysical expenses [Member]      
DisclosureOfOperatingExpensesLineItems [Line Items]      
Services expense 273,000,000 204,000,000 254,000,000
Gas & Power Segment [Member] | Trade Receivables [Member]      
DisclosureOfOperatingExpensesLineItems [Line Items]      
Additional allowance recognised in profit or loss, allowance account for credit losses of financial assets € 446,000,000 € 399,000,000 € 549,000,000