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Income (expense) from investments (Details) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Expense From Investments Details 1
Share of profit from equity-accounted investments	€ 124	€ 77	€ 150
Share of loss from equity-accounted investments	(353)	(370)	(615)
Decreases (increases) in the provision for losses on investments from equity accounted investments	(38)	(33)	(6)
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method	€ (267)	€ (326)	€ (471)

X

- Definition

The amount of decreases (increases) in the provision for losses on investments from equity accounted investments.

+ References

No definition available.

+ Details

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Namespace Prefix:	E_
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Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	E_DisclosureOfIncomeExpenseFromInvestmentsAbstract
Namespace Prefix:	E_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

The entity's share of the loss of investments accounted for using the equity method.

+ References

No definition available.

+ Details

Name:	E_ShareOfLossFromEquityAccountedInvestments
Namespace Prefix:	E_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The entity's share of the profit of investments accounted for using the equity method.

+ References

No definition available.

+ Details

Name:	E_ShareOfProfitFromEquityAccountedInvestments
Namespace Prefix:	E_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

The entity's share of the profit (loss) from continuing operations of associates and joint ventures accounted for using the equity method. [Refer: Associates [member]; Continuing operations [member]; Investments accounted for using equity method; Joint ventures [member]; Profit (loss) from continuing operations]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2017-01-01
-Paragraph B16
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_B16_a&doctype=Appendix&seq=2
-URIDate 2017-03-09

+ Details

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