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Other non-current liabilities (Details) - EUR (€) € in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of other Noncurrent Liabilities Explanatory [Abstract]
Liabilities from customer contracts	€ 518

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- Definition

Disclosure of other Noncurrent Liabilities Explanatory.

+ References

No definition available.

+ Details

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Namespace Prefix:	e_
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- Definition

The amount of non-current contract liabilities. [Refer: Contract liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2018-01-01
-Paragraph 105
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_105&doctype=Standard
-URIDate 2018-03-16

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant