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Investments - Other investments (Details) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Investments
Carrying amount at the beginning of the year	€ 929	€ 919
Additions and subscriptions	8	11
Change in the fair value	24	(3)
Divestments and reimbursements	(12)	(12)
Currency translation differences	(61)	15
Other changes	69	(1)
Carrying amount at the end of the year	€ 957	€ 929

X

- Definition

The amount of additions to investments other than investments accounted for using equity method.

+ References

No definition available.

+ Details

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Namespace Prefix:	e_
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X

- Definition

The amount of change in the fair value to investments other than investments accounted for using the equity method.

+ References

No definition available.

+ Details

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Namespace Prefix:	e_
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X

- Definition

Disclosure Of Investments

+ References

No definition available.

+ Details

Name:	e_DisclosureOfInvestmentsAbstract
Namespace Prefix:	e_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of divestments and reimbursements to investments other than investments accounted for using equity method.

+ References

No definition available.

+ Details

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Balance Type:	credit
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X

- Definition

The increase (decrease) in investments other than investments accounted for using equity method resulting from other changes that the entity does not separately disclose in the same statement or note.

+ References

No definition available.

+ Details

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X

- Definition

The increase (decrease) through net exchange differences investments other than investments accounted for using equity method resulting from changes that the entity does not separately disclose in the same statement or note.

+ References

No definition available.

+ Details

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Namespace Prefix:	e_
Data Type:	xbrli:monetaryItemType
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X

- Definition

The amount of non-current investments other than investments accounted for using the equity method. [Refer: Investments accounted for using equity method; Non-current assets; Investments other than investments accounted for using equity method]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard
-URIDate 2020-01-01

+ Details

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