XML 261 R254.htm IDEA: XBRL DOCUMENT v3.8.0.1

Other information about investments (Details 1) - EUR (€)		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Disclosure of subsidiaries [line items]
Share Capital		€ 4,005,000,000	€ 4,005,000,000
Italy [Member] | Exploration & Production [Member] | Subsidiaries One [Member]
Disclosure of subsidiaries [line items]
Company name		Eni Angola SpA
Registered office		San Donato Milanese (MI)
Country of operation		Angola
Share Capital		€ 20,200,000
Shareholders		Eni SpA
% Ownership		100.00%
% Equity ratio		100.00%
Consolidation or valutation method	[1]	F.C.
Italy [Member] | Exploration & Production [Member] | Subsidiaries Two [Member]
Disclosure of subsidiaries [line items]
Company name		Eni Mediterranea Idrocarburi SpA
Registered office		Gela (CL)
Country of operation		Italy
Share Capital		€ 5,200,000
Shareholders		Eni SpA
% Ownership		100.00%
% Equity ratio		100.00%
Consolidation or valutation method	[1]	F.C.
Italy [Member] | Exploration & Production [Member] | Subsidiaries Three [Member]
Disclosure of subsidiaries [line items]
Company name		Eni Mozambico SpA
Registered office		San Donato Milanese (MI)
Country of operation		Mozambique
Share Capital		€ 200,000
Shareholders		Eni SpA
% Ownership		100.00%
% Equity ratio		100.00%
Consolidation or valutation method	[1]	F.C.
Italy [Member] | Exploration & Production [Member] | Subsidiaries Four [Member]
Disclosure of subsidiaries [line items]
Company name		Eni Timor Leste SpA
Registered office		San Donato Milanese (MI)
Country of operation		East Timor
Share Capital		€ 6,841,517
Shareholders		Eni SpA
% Ownership		100.00%
% Equity ratio		100.00%
Consolidation or valutation method	[1]	F.C.
Italy [Member] | Exploration & Production [Member] | Subsidiaries Five [Member]
Disclosure of subsidiaries [line items]
Company name		Eni West Africa SpA
Registered office		San Donato Milanese (MI)
Country of operation		Angola
Share Capital		€ 10,000,000
Shareholders		Eni SpA
% Ownership		100.00%
% Equity ratio		100.00%
Consolidation or valutation method	[1]	F.C.
Italy [Member] | Exploration & Production [Member] | Subsidiaries Six [Member]
Disclosure of subsidiaries [line items]
Company name		Eni Zubair SpA (in liquidation)
Registered office		San Donato Milanese (MI)
Country of operation		Italy
Share Capital		€ 120,000
Shareholders		Eni SpA
% Ownership		100.00%
Consolidation or valutation method	[1]	Co.
Italy [Member] | Exploration & Production [Member] | Subsidiaries Seven [Member]
Disclosure of subsidiaries [line items]
Company name		EniProgetti SpA (former Tecnomare - Societa per lo Sviluppo delle Tecnologie Marine SpA)
Registered office		Venezia Marghera (VE)
Country of operation		Italy
Share Capital		€ 2,064,000
Shareholders		Eni SpA
% Ownership		100.00%
% Equity ratio		100.00%
Consolidation or valutation method	[1]	F.C.
Italy [Member] | Exploration & Production [Member] | Subsidiaries Eight [Member]
Disclosure of subsidiaries [line items]
Company name		Floaters SpA
Registered office		San Donato Milanese (MI)
Country of operation		Italy
Share Capital		€ 200,120,000
Shareholders		Eni SpA
% Ownership		100.00%
% Equity ratio		100.00%
Consolidation or valutation method	[1]	F.C.
Italy [Member] | Exploration & Production [Member] | Subsidiaries Nine [Member]
Disclosure of subsidiaries [line items]
Company name		Ieoc SpA
Registered office		San Donato Milanese (MI)
Country of operation		Egypt
Share Capital		€ 18,331,000
Shareholders		Eni SpA
% Ownership		100.00%
% Equity ratio		100.00%
Consolidation or valutation method	[1]	F.C.
Italy [Member] | Exploration & Production [Member] | Subsidiaries Ten [Member]
Disclosure of subsidiaries [line items]
Company name		Societa Petrolifera
Registered office		San Donato Milanese (MI)
Country of operation		Italy
Share Capital		€ 24,103,200
% Equity ratio		99.96%
Consolidation or valutation method	[1]	F.C.
Italy [Member] | Exploration & Production [Member] | Subsidiaries Ten [Member] | Eni SpA [Member]
Disclosure of subsidiaries [line items]
Shareholders		Eni SpA
% Ownership		99.96%
Italy [Member] | Exploration & Production [Member] | Subsidiaries Ten [Member] | Other Related Parties [Member]
Disclosure of subsidiaries [line items]
Shareholders		Third parties
% Ownership		0.04%
[1] F.C. = full consolidation, J.O. = joint operation, Eq. = equity-accounted, Co. = valued at cost, F.V. = valued at fair value

X

- Definition

Percentage of measures the proprotion of the total assets that are financed by shareholders, as defined by regulatory framework.

+ References

No definition available.

+ Details

Name:	E_LeverageEquityRatio
Namespace Prefix:	E_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The name of an shareholders.

+ References

No definition available.

+ Details

Name:	E_NameOfShareholders
Namespace Prefix:	E_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The address at which the entity's office is registered.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 138
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_138_a&doctype=Standard
-URIDate 2017-03-09

+ Details

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

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

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

X

- Definition

The nominal value of capital issued.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 78
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_78_e&doctype=Standard
-URIDate 2017-03-09

+ Details

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

X

- Definition

The description of the method used to account for investments in subsidiaries. [Refer: Subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2017-01-01
-Paragraph 16
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2017-03-01&anchor=para_16_c&doctype=Standard
-URIDate 2017-03-09

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2017-01-01
-Paragraph 17
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2017-03-01&anchor=para_17_c&doctype=Standard
-URIDate 2017-03-09

+ Details

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

X

- Definition

The name of a subsidiary. [Refer: Subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2017-01-01
-Paragraph 17
-Subparagraph b
-Clause i
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2017-03-01&anchor=para_17_b_i&doctype=Standard
-URIDate 2017-03-09

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2017-01-01
-Paragraph 16
-Subparagraph b
-Clause i
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2017-03-01&anchor=para_16_b_i&doctype=Standard
-URIDate 2017-03-09

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2017-01-01
-Paragraph 12
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_12_a&doctype=Standard
-URIDate 2017-03-09

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2017-01-01
-Paragraph 19B
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_19B_a&doctype=Standard
-URIDate 2017-03-09

+ Details

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

X

- Definition

The principal place of business of a subsidiary. [Refer: Principal place of business; Subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2017-01-01
-Paragraph 16
-Subparagraph b
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2017-03-01&anchor=para_16_b_ii&doctype=Standard
-URIDate 2017-03-09

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2017-01-01
-Paragraph 17
-Subparagraph b
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2017-03-01&anchor=para_17_b_ii&doctype=Standard
-URIDate 2017-03-09

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2017-01-01
-Paragraph 12
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_12_b&doctype=Standard
-URIDate 2017-03-09

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2017-01-01
-Paragraph 19B
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_19B_b&doctype=Standard
-URIDate 2017-03-09

+ Details

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

X

- Definition

The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2017-01-01
-Paragraph 17
-Subparagraph b
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2017-03-01&anchor=para_17_b_iii&doctype=Standard
-URIDate 2017-03-09

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2017-01-01
-Paragraph 16
-Subparagraph b
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2017-03-01&anchor=para_16_b_iii&doctype=Standard
-URIDate 2017-03-09

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2017-01-01
-Paragraph 19B
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_19B_c&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_ProportionOfOwnershipInterestInSubsidiary
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_GeographicalAreasAxis=E_ItalyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SegmentConsolidationItemsAxis=E_ExplorationAndProductionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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