The amount of additions and subscriptions to investments accounted for using equity method.

No definition available.

Name:	e_AdditionsAndSubscriptionsInInvestmentsAccountedForUsingEquityMethod
Namespace Prefix:	e_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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

Name:	e_ChangeInTheFairValueInInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod
Namespace Prefix:	e_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

It represents the changes in scope of consolidation.

+ References

No definition available.

+ Details

Name:	e_ChangesInScopeOfConsolidation
Namespace Prefix:	e_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

It represents the deduction for dividends.

+ References

No definition available.

+ Details

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

- Definition

The difference amount between market capitalization of investee and book value of corresponding fraction of net equity.

+ References

No definition available.

+ Details

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

- Definition

The difference amount between purchase price of interest acquired and book value of corresponding fraction of net equity.

+ References

No definition available.

+ Details

Name:	e_DifferenceAmountBetweenPurchasePriceOfInterestAcquiredAndBookValueOfCorrespondingFractionOfNetEquity
Namespace Prefix:	e_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Disclosure Of Investments

+ References

No definition available.

+ Details

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

- Definition

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

+ References

No definition available.

+ Details

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

- 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

Name:	e_IncreaseDecreaseInInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethodResultingFromOtherChanges
Namespace Prefix:	e_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	e_IncreaseDecreaseInInvestmentsUsingEquityMethodResultingFromOtherChanges
Namespace Prefix:	e_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The production capacity per annum of a multi-train liquefaction plant.

+ References

No definition available.

+ Details

Name:	e_LiquefactionPlantProductionCapacityPerAnnum
Namespace Prefix:	e_
Data Type:	num:massItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of proportion of ownership interest acquired.

+ References

No definition available.

+ Details

Name:	e_ProportionOfOwnershipInterestAcquired
Namespace Prefix:	e_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of proportion of ownership interest divested in equity method investment.

+ References

No definition available.

+ Details

Name:	e_ProportionOfOwnershipInterestDivestedInEquityMethodInvestment
Namespace Prefix:	e_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

It represents the share of loss of equity accounted investments.

+ References

No definition available.

+ Details

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

- Definition

It represents the share of profit of equity accounted investments.

+ References

No definition available.

+ Details

Name:	e_ShareOfProfitOfEquityAccountedInvestments
Namespace Prefix:	e_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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 2022-03-24
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_55&doctype=Standard
-URIDate 2022-03-24

+ Details

Name:	ifrs-full_NoncurrentInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The percentage of a reasonably possible increase in an unobservable input used in fair value measurement of assets.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 13
-IssueDate 2022-03-24
-Paragraph 93
-Subparagraph h
-Clause ii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2022-en-r&anchor=para_93_h_ii&doctype=Standard
-URIDate 2022-03-24

+ Details

Name:	ifrs-full_PercentageOfReasonablyPossibleIncreaseInUnobservableInputAssets
Namespace Prefix:	ifrs-full_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The proportion of ownership interest in a joint venture attributable to the entity. [Refer: Joint ventures [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2022-03-24
-Paragraph 17
-Subparagraph b
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2022-en-r&anchor=para_17_b_iii&doctype=Standard
-URIDate 2022-03-24

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2022-03-24
-Paragraph 16
-Subparagraph b
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2022-en-r&anchor=para_16_b_iii&doctype=Standard
-URIDate 2022-03-24

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2022-03-24
-Paragraph 21
-Subparagraph a
-Clause iv
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2022-en-r&anchor=para_21_a_iv&doctype=Standard
-URIDate 2022-03-24

+ Details

Name:	ifrs-full_ProportionOfOwnershipInterestInJointVenture
Namespace Prefix:	ifrs-full_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	e_TypesOfInvestmentsAxis=e_NorthFieldEastProjectMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	e_TypesOfInvestmentsAxis=e_NigeriaLNGLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	e_TypesOfInvestmentsAxis=e_SaudiEuropeanPetroChemicalCoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=e_QatarLiquefiedGasCompanyLimited9Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=e_NovamontSpAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_SignificantInvestmentsInAssociatesAxis=ifrs-full_AssociatesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=e_AngolaLNGLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=e_AbuDhabiOilRefiningCoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=e_VarEnergiASAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=e_AdnocGlobalTradingLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=e_CoralFLNGSAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_JointVenturesAxis=ifrs-full_JointVenturesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=e_UkDoggerBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=e_SaipemSpAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=e_MozambiqueRovumaVentureSpAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=e_DoggerbankOffshoreWindFarmProject3HoldcoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=e_VargronnAsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=e_AzuleEnergyHoldingsLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Investments - Additional information (Details) € in Millions	12 Months Ended
	Dec. 31, 2022 EUR (€) MT	Dec. 31, 2021 EUR (€)	Dec. 01, 2021 EUR (€)	Dec. 31, 2020 EUR (€)
Investments
Additions and subscriptions	€ 1,607	€ 662
Divestments and reimbursements	480	385
Share of loss of equity-accounted investments	285	1,294
Deduction for dividends	1,194	627
Difference amount between purchase price of interest acquired and book value of corresponding fraction of net equity	€ 74
Percentage of reasonable changes in cost of capital	1.00%
Change in the fair value with effect to OCI	€ 56	105
Other investments	1,202	1,294	€ 1,294	€ 957
Share of profit of equity-accounted investments	2,163	202
Change in the scope of consolidation	(1,827)	360
Other changes	6,220	(161)
Other changes of other investments	€ (258)
North Field East project (NFE)
Investments
Proportion of ownership interest acquired	3.125%
Nigeria LNG Ltd
Investments
Other investments	€ 668	637
Saudi European Petrochemical Co
Investments
Other investments	€ 108	€ 124
Qatar Liquefied Gas Co Ltd (9) \| North Field East project (NFE)
Investments
Proportion of ownership interest acquired	12.50%
Liquefaction plant production capacity per annum \| MT	32
Novamont SpA
Investments
Other changes of other investments	€ 220
Associates \| Angola LNG Ltd
Investments
Divestments and reimbursements	375
Share of profit of equity-accounted investments	290
Change in the scope of consolidation	1,122
Associates \| Qatar Liquefied Gas Co Ltd (9)
Investments
Additions and subscriptions	€ 306
Proportion of ownership interest acquired	25.00%
Associates \| Abu Dhabi Oil Refining Co (Takreer)
Investments
Deduction for dividends	€ 142
Share of profit of equity-accounted investments	359
Associates \| Var Energi ASA
Investments
Divestments and reimbursements	91
Deduction for dividends	€ 469
Proportion of ownership interest divested in equity method investment	6.00%
Share of profit of equity-accounted investments	€ 691
Difference amount between market capitalization of investee and book value of corresponding fraction of net equity	4,267
Associates \| ADNOC Global Trading Ltd
Investments
Deduction for dividends	54
Share of profit of equity-accounted investments	170
Associates \| Coral FLNG SA
Investments
Share of profit of equity-accounted investments	140
Joint ventures \| UK Dogger Bank
Investments
Change in the scope of consolidation	731
Joint ventures \| Saipem SpA
Investments
Additions and subscriptions	624
Share of loss of equity-accounted investments	82
Difference amount between market capitalization of investee and book value of corresponding fraction of net equity	57
Joint ventures \| Mozambique Rovuma Venture SpA
Investments
Share of loss of equity-accounted investments	72
Joint ventures \| Doggerbank Offshore Wind Farm Project 3 Holdco Ltd
Investments
Additions and subscriptions	€ 161
Proportion of ownership interest acquired	20.00%
Joint ventures \| Vårgrønn AS
Investments
Proportion of ownership interest in joint venture	65.00%
Other changes	€ 374
Joint ventures \| Azule Energy Holdings Ltd
Investments
Deduction for dividends	475
Share of profit of equity-accounted investments	455
Other changes	5,352
Joint ventures \| Novamont SpA
Investments
Share of loss of equity-accounted investments	€ 53