XML 260 R253.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Other information about investments (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 EUR (€) | Dec. 31, 2016 EUR (€)
Disclosure of subsidiaries [line items] |  |  |
Share capital |  | € 4,005,000,000 | € 4,005,000,000
Parent [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Share capital |  | € 4,005,358,876 |
Parent [Member] | Cassa Depositi ePrestiti SpA [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of parent entity | [1] | Eni SpA(#) |
Registered office |  | Rome |
Principal place of business |  | Italy |
Name of Shareholders |  | Cassa Depositi e Prestiti SpA |
Equity Method Investments, Ownership Percentage |  | 25.76 |
Parent [Member] | Ministero dell Economia e delle Finanze [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of Shareholders |  | Ministero dell’Economia e delle Finanze |
Equity Method Investments, Ownership Percentage |  | 4.34 |
Parent [Member] | Eni SpA [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of Shareholders |  | Eni SpA |
Equity Method Investments, Ownership Percentage |  | 0.91 |
Parent [Member] | Other Shareholders [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of Shareholders |  | Other shareholders |
Equity Method Investments, Ownership Percentage |  | 68.99 |
[1] | Company with shares quoted in the regulated market of Italy or of other EU countries

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted under the equity method of accounting + References No definition available. + Details
Name: | E_EquityMethodInvestmentsOwnershipPercentage
Namespace Prefix: | E_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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 name of the entity's parent. [Refer: Parent [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2017-01-01 -Paragraph 13 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2017-03-01&anchor=para_13&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 138 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_138_c&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_NameOfParentEntity
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The place where an entity principally conducts operations. + 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_PrincipalPlaceOfBusiness
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=ifrs-full_ParentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | E_MajorShareholdersAxis=E_CassaDepositiePrestitiSpAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | E_MajorShareholdersAxis=E_MinisterodellEconomiaedelleFinanzeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | E_MajorShareholdersAxis=E_EniSpAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | E_MajorShareholdersAxis=E_OtherShareholdersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |