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Guarantees, commitments and risks - Guarantees (Details) - EUR (€) € in Millions	Dec. 31, 2020	Dec. 31, 2019
Guarantees, commitments and risks
Guarantees	€ 8,884	€ 8,862
Consolidated subsidiaries
Guarantees, commitments and risks
Guarantees	4,758	4,323
Investments in unconsolidated entities controlled by Eni
Guarantees, commitments and risks
Guarantees	176	197
Joint ventures and associates
Guarantees, commitments and risks
Guarantees	3,800	4,075
Others
Guarantees, commitments and risks
Guarantees	€ 150	€ 267

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- Definition

The total amount of the guarantees.

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	e_ClassesOfGuaranteedEntitiesAxis=e_JointVenturesAndAssociatesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	e_ClassesOfGuaranteedEntitiesAxis=e_OthersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: