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Guarantees, commitments and risks (Details 2) - EUR (€) € in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Interest rate risk [member] |  |  |
DisclosureOfContingentLiabilitiesExplanatoryLineItems [Line Items] |  |  |
Value at risk | [1] | € 2,580 | € 3,420
Exchange rate [Member] |  |  |
DisclosureOfContingentLiabilitiesExplanatoryLineItems [Line Items] |  |  |
Value at risk | [1] | 260 | 170
Top of range [member] | Interest rate risk [member] |  |  |
DisclosureOfContingentLiabilitiesExplanatoryLineItems [Line Items] |  |  |
Value at risk | [1] | 3,760 | 5,270
Top of range [member] | Exchange rate [Member] |  |  |
DisclosureOfContingentLiabilitiesExplanatoryLineItems [Line Items] |  |  |
Value at risk | [1] | 570 | 340
Bottom Of Range [Member] | Interest rate risk [member] |  |  |
DisclosureOfContingentLiabilitiesExplanatoryLineItems [Line Items] |  |  |
Value at risk | [1] | 1,720 | 2,550
Bottom Of Range [Member] | Exchange rate [Member] |  |  |
DisclosureOfContingentLiabilitiesExplanatoryLineItems [Line Items] |  |  |
Value at risk | [1] | 80 | 40
Weighted Average [Member] | Interest rate risk [member] |  |  |
DisclosureOfContingentLiabilitiesExplanatoryLineItems [Line Items] |  |  |
Value at risk | [1] | 2,380 | 3,620
Weighted Average [Member] | Exchange rate [Member] |  |  |
DisclosureOfContingentLiabilitiesExplanatoryLineItems [Line Items] |  |  |
Value at risk | [1] | € 220 | € 140
[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 2017-01-01 -Paragraph 41 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_41&doctype=Standard -URIDate 2017-03-09 + Details
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