XML 193 R186.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Provisions for employee benefits (Details 5) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
TFR [Member] |  |
Statement Line Items [Line Items] |  |
Discount rate | 1.50% | 1.00%
Rate of compensation increase | 2.50% | 2.00%
Rate of price inflation | 1.50% | 1.00%
Foreign defined benefit plans [Member] | Bottom Of Range [Member] |  |
Statement Line Items [Line Items] |  |
Discount rate | 0.60% | 0.60%
Rate of compensation increase | 1.50% | 1.00%
Rate of price inflation | 0.60% | 0.60%
Foreign defined benefit plans [Member] | Top Of Range [Member] |  |
Statement Line Items [Line Items] |  |
Discount rate | 15.50% | 17.50%
Rate of compensation increase | 13.50% | 15.00%
Rate of price inflation | 14.80% | 13.50%
FISDE and other foreign medical plans [Member] |  |
Statement Line Items [Line Items] |  |
Discount rate | 1.50% | 1.00%
Rate of price inflation | 1.50% | 1.00%
Other benefit plans [Member] | Bottom Of Range [Member] |  |
Statement Line Items [Line Items] |  |
Discount rate | 0.00% | 0.00%
Other benefit plans [Member] | Top Of Range [Member] |  |
Statement Line Items [Line Items] |  |
Discount rate | 1.50% | 1.00%
Rate of price inflation | 1.50% | 1.00%

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

X
- Definition The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_144&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_ActuarialAssumptionOfDiscountRates
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The expected rate of inflation that is used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_144&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_ActuarialAssumptionOfExpectedRatesOfInflation
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_144&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_ActuarialAssumptionOfExpectedRatesOfSalaryIncreases
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=E_TFRMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=ifrs-full_ForeignDefinedBenefitPlansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=E_SupplementaryMedicalReserveForEniManagersFISDEAndOtherForeignMedicalPlansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=E_OtherForeignLongTermBenefitPlansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |