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Other current assets (Details Textual) - EUR (€) € in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure Of Other Current Assets [Abstract] |  |
Current prepayments and other current assets | € 342 | € 343
Residual Amount of Current prepayments and other current assets | € 63 | € 90

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- References No definition available. + Details
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Namespace Prefix: | E_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The residual amount of current prepayments and other current assets. + References No definition available. + Details
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Namespace Prefix: | E_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of current prepayments and other current assets. [Refer: Other current assets; Current prepayments] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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Balance Type: | debit
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