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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

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- Definition The percentage of shares vest subject to lock up clause of one year after vesting date. + References No definition available. + Details
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- Definition The element represents about share based payment arrangement vesting range. + References No definition available. + Details
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- Definition The portion of lease payments recognised as an expense that is not fixed in amount but is based on the future amount of a factor that changes other than with the passage of time (for example, percentage of future sales, amount of future use, future price indices, future market rates of interest). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2019-01-01 -Name IAS -Number 17 -IssueDate 2017-01-01 -Paragraph 35 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2017-03-02&anchor=para_35_c&doctype=Standard&book=B -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2019-01-01 -Name IAS -Number 17 -IssueDate 2017-01-01 -Paragraph 31 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2017-03-02&anchor=para_31_c&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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- Definition The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_a_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of payments over the finance lease term that the lessee is or can be required to make, excluding contingent rent, costs for services and taxes to be paid by, and reimbursed to, the lessor, together with any amounts guaranteed by the lessee or by a party related to the lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2019-01-01 -Name IAS -Number 17 -IssueDate 2017-01-01 -Paragraph 31 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2017-03-02&anchor=para_31_b&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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- Definition The number of instruments granted in share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph IG23 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_IG23&doctype=Implementation%20Guidance -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of expenses that the entity does not separately disclose in the same statement or note when the entity uses the 'nature of expense' form for its analysis of expenses. [Refer: Expenses, by nature] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 102 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_102&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_99&doctype=Standard -URIDate 2017-03-09 + Details
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