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Guarantees, commitments and risks (Details 2) - EUR (€) € in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Interest Rate [Member] |  |  |
Disclosure Of Contingent Liabilities Explanatory [Line Items] |  |  |
Value at risk | [1] | € 2,990 | € 2,580
Exchange rate [Member] |  |  |
Disclosure Of Contingent Liabilities Explanatory [Line Items] |  |  |
Value at risk | [1] | 250 | 260
Top of range [member] | Interest Rate [Member] |  |  |
Disclosure Of Contingent Liabilities Explanatory [Line Items] |  |  |
Value at risk | [1] | 3,650 | 3,760
Top of range [member] | Exchange rate [Member] |  |  |
Disclosure Of Contingent Liabilities Explanatory [Line Items] |  |  |
Value at risk | [1] | 570 | 570
Bottom of range [member] | Interest Rate [Member] |  |  |
Disclosure Of Contingent Liabilities Explanatory [Line Items] |  |  |
Value at risk | [1] | 1,800 | 1,720
Bottom of range [member] | Exchange rate [Member] |  |  |
Disclosure Of Contingent Liabilities Explanatory [Line Items] |  |  |
Value at risk | [1] | 90 | 80
Average [Member] | Interest Rate [Member] |  |  |
Disclosure Of Contingent Liabilities Explanatory [Line Items] |  |  |
Value at risk | [1] | 2,730 | 2,380
Average [Member] | Exchange rate [Member] |  |  |
Disclosure Of Contingent Liabilities Explanatory [Line Items] |  |  |
Value at risk | [1] | € 280 | € 220
[1] | Value at risk deriving from interest and exchange rates exposures include the following finance department: Eni Corporate Treasury Department, Eni Finance International SA, Banque Eni SA and Eni Finance USA Inc.

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- Definition The measure of a potential loss exposure as a result of future market movements, based on a specified confidence interval and measurement horizon. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 41 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_41&doctype=Standard -URIDate 2018-03-16 + Details
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