XML 259 R252.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Transactions with related parties (Details Textual) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
DisclosureOfTransactionsWithRelatedPartiesLineItems [Line Items] |  |  |
Provisions to pension funds | € 34 |  |
Finance costs | 5,886 | € 6,232 | € 10,104
Vodafone Italia SpA [Member] |  |  |
DisclosureOfTransactionsWithRelatedPartiesLineItems [Line Items] |  |  |
Service Expense | 8 |  |
Eni Foundation [Member] |  |  |
DisclosureOfTransactionsWithRelatedPartiesLineItems [Line Items] |  |  |
Contributions And Service Provisions To Foundation | 2 |  |
Eni Enrico Mattei [Member] |  |  |
DisclosureOfTransactionsWithRelatedPartiesLineItems [Line Items] |  |  |
Contributions And Service Provisions To Foundation | 4 |  |
Related parties [member] |  |  |
DisclosureOfTransactionsWithRelatedPartiesLineItems [Line Items] |  |  |
Finance costs | € 242 |  |

X
- Definition contributions and service provisions to foundation + References No definition available. + Details
Name: | E_ContributionsAndServiceProvisionsToFoundation
Namespace Prefix: | E_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | E_DisclosureOfTransactionsWithRelatedPartiesLineItems
Namespace Prefix: | E_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of mobile communication services expense. + References No definition available. + Details
Name: | E_MobileCommunicationServicesExpense
Namespace Prefix: | E_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of current provisions for employee benefits. [Refer: Provisions for employee benefits] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 78 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_78_d&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_CurrentProvisionsForEmployeeBenefits
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of costs associated with financing activities of the entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 82 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_82_b&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_FinanceCosts
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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

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

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