Finance debts - Additional information (Details 1) - EUR (€)	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Borrowings
Changes in the scope of consolidation	€ 403,000,000	€ (1,571,000,000)
Lease liabilities assumptions	1,584,000,000	€ 2,401,000,000
Trade payables on which payment term extensions have been negotiated	€ 1,047,000,000
Minimum
Borrowings
Discount rates used to measure fair value of financial debt	1.90%	1.80%
Maximum
Borrowings
Discount rates used to measure fair value of financial debt	5.20%	5.10%
Novamont group
Borrowings
Changes in the scope of consolidation	€ 211,000,000
Plenitude
Borrowings
Changes in the scope of consolidation	33,000,000
Committed borrowing facilities
Borrowings
Borrowing facilities	9,120,000,000	€ 8,298,000,000
Convertible senior unsecured sustainability-linked bond
Borrowings
Nominal value	€ 1,000,000,000
Bond expiry	7 years
Percentage of par value of bonds (as a percent)	100.00%
Annual fixed coupon rate of bonds (as a percent)	2.95%
Bond conversion price	17.5513
Bond reference price	14.6261
Convertible senior unsecured sustainability-linked bond \| Minimum
Borrowings
Bond premium with respect to share reference price at date of issuance (as a percent)	20.00%

The percentage of annul fixed coupon rate of the bonds issuable.

No definition available.

Name:	e_AnnualFixedCouponRateOfBonds
Namespace Prefix:	e_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The conversion price of bond issued.

+ References

No definition available.

+ Details

Name:	e_BondConversionPrice
Namespace Prefix:	e_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

The expiration period of bond.

+ References

No definition available.

+ Details

Name:	e_BondExpirePeriod
Namespace Prefix:	e_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of bond premium with respect to share reference price at date of issuance.

+ References

No definition available.

+ Details

Name:	e_BondPremiumWithRespectToShareReferencePriceAtDateOfIssuance
Namespace Prefix:	e_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The reference price of bond issued.

+ References

No definition available.

+ Details

Name:	e_BondReferencePrice
Namespace Prefix:	e_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount of borrowing facilities which includes but not limited to undrawn or drawn facilities.

+ References

No definition available.

+ Details

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

- Definition

The discount rates used to measure fair value of financial debt.

+ References

No definition available.

+ Details

Name:	e_DiscountRatesUsedToMeasureFairValueOfFinancialDebt
Namespace Prefix:	e_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The increase (decrease) in liabilities arising from financing activities resulting from changes in trade payables.

+ References

No definition available.

+ Details

Name:	e_IncreaseDecreaseThroughChangesInTradePayablesLiabilitiesArisingFromFinancingActivities
Namespace Prefix:	e_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The percentage of par value of bonds issuable.

+ References

No definition available.

+ Details

Name:	e_PercentageOfParValueOfBonds
Namespace Prefix:	e_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

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

- Definition

The increase (decrease) in liabilities arising from financing activities resulting from obtaining or losing control of subsidiaries or other businesses. [Refer: Liabilities arising from financing activities; Subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 7
-IssueDate 2023-01-01
-Paragraph 44B
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2023-en-r&anchor=para_44B_b&doctype=Standard
-URIDate 2023-03-23

+ Details

Name:	ifrs-full_IncreaseDecreaseThroughObtainingOrLosingControlOfSubsidiariesOrOtherBusinessesLiabilitiesArisingFromFinancingActivities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The increase in liabilities arising from financing activities resulting from new leases. [Refer: Liabilities arising from financing activities]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 7
-IssueDate 2023-01-01
-Section A Statement of cash flows for an entity other than a financial institution
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2023-en-r&doctype=Illustrative%20Examples&dita_xref=IAS07_IE_A_TI
-URIDate 2023-03-23

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 7
-IssueDate 2023-01-01
-Paragraph 44B
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2023-en-r&anchor=para_44B&doctype=Standard
-URIDate 2023-03-23

+ Details

Name:	ifrs-full_IncreaseThroughNewLeasesLiabilitiesArisingFromFinancingActivities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 112
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2023-03-23

+ Details

Name:	ifrs-full_NotionalAmount
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BusinessCombinationsAxis=e_NovamontGroupMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_SegmentsAxis=e_PlenitudeSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	e_TypeOfBorrowingsAxis=e_CommittedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=e_ConvertibleSeniorUnsecuredSustainabilityLinkedBondMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: