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Costs (Details Textual)
€ in Thousands
 12 Months Ended
Apr. 13, 2018
Apr. 13, 2017
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
EUR (€)
Dec. 31, 2016
EUR (€)
Disclosure Of Operating Expenses [Line Items]          
Total Purchases Services And Other Costs     € 55,622,000 € 51,548,000 € 43,278,000
Research and Development Expense     197,000 185,000 161,000
Minimum operating lease payments recognised as expense     872,000 1,022,000 566,000
Provisions For Redundancy Incentives     37,000 18,000 47,000
Post-employment benefit expense, defined contribution plans     95,000 90,000 83,000
Directors' remuneration expense     9,600 14,500 7,100
Statutory auditors remuneration expense     604 760 738
Contingent rents recognised as expense       0  
Minimum finance lease payments payable       0  
Share Based Payment Arrangement Vesting Term   three-year      
Long-Term Monetary Incentive Plan 2017 – 2019 [Member]          
Disclosure Of Operating Expenses [Line Items]          
Description of share-based payment arrangement   0% and 180%      
Payroll and related costs [Member]          
Disclosure Of Operating Expenses [Line Items]          
Description of share-based payment arrangement   50%      
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”)1 and the TSR of their corresponding stock exchange market2; (ii) growth in the Net Present Value (NPV) of proved reserves benchmarked against the Peer Group.      
Sharebased payment arrangement vesting range   0% and 180%      
Number of other equity instruments granted in share-based payment arrangement 1,517,975 1,719,061      
Weighted average exercise price of share options granted in share-based payment arrangement     11,730 7,990  
Weighted average share price, share options granted     € 14,246 € 13,810  
Expected dividend as percentage, share options granted   5.80%      
Expected volatility, share options granted     20.00% 25.00%  
Expense from share-based payment transactions with employees     € 5,100 € 400  
Explanation of determination of fair value of goods or services received or fair value of equity instruments granted on share-based payments   The estimation of the fair value was calculated by adopting specific valuation techniques regarding the different performance parameters provided by the plan (the stochastic method for the market condition of the plan and the Black-Scholes model for the component related to the NPV of the reserves) taking into account the fair value of the Eni share at the grant date (€13.81 per share), reduced by dividends expected along the vesting period (5.79% of the share price determined considering the dividends announced in the 12 months before the award), the volatility of the stock (25.12%), the forecasts for the performance parameters, as well as the lower value attributable to the shares considering the lock-up period at the end of the vesting period.      
Exploration And Production Segment Total [Member] | Geological and geophysical expenses [Member]          
Disclosure Of Operating Expenses [Line Items]          
Total Purchases Services And Other Costs     287,000 273,000 204,000
Exploration Production Segment [Member]          
Disclosure Of Operating Expenses [Line Items]          
Royalty Expense     € 1,043,000 € 674,000 € 572,000