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Shareholders' equity (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
DisclosureOfClassesOfShareCapitalExplanatoryLineItems [Line Items] |  |  |
Net profit | € 3 | € 7 | € (595)
Shareholders' equity | 49 | 49 |
EniPower Mantova SpA [Member] |  |  |
DisclosureOfClassesOfShareCapitalExplanatoryLineItems [Line Items] |  |  |
Net profit | 4 | 5 |
Shareholders' equity | 23 | 21 |
Adriaplin Doo [Member] |  |  |
DisclosureOfClassesOfShareCapitalExplanatoryLineItems [Line Items] |  |  |
Net profit | 2 | 2 |
Shareholders' equity | 14 | 13 |
Serfactoring SpA [Member] |  |  |
DisclosureOfClassesOfShareCapitalExplanatoryLineItems [Line Items] |  |  |
Net profit | (3) |  |
Shareholders' equity | € 12 | € 15 |

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- Definition The amount of equity in a subsidiary not attributable, directly or indirectly, to a parent. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph 12 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_12_f&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph q -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_q&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 10 -IssueDate 2017-01-01 -Paragraph 22 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=10&date=2017-03-01&anchor=para_22&doctype=Standard -URIDate 2017-03-09 + Details
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