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Guarantees, commitments and risks - Commitments and risks (Details) - EUR (€) € in Millions	Dec. 31, 2020	Dec. 31, 2019
Guarantees, commitments and risks
Commitments	€ 69,998	€ 74,338
Risks	600	676
Commitments and risks	€ 70,598	€ 75,014

X

- Definition

The amount of commitments and risks.

+ References

No definition available.

+ Details

Name:	e_CommitmentsAndRisks
Namespace Prefix:	e_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

The amount of risks associated with the entity.

+ References

No definition available.

+ Details

Name:	e_Risks
Namespace Prefix:	e_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of capital commitments for which the entity has entered into a contract. [Refer: Capital commitments]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_ContractualCapitalCommitments
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant