XML 199 R128.htm IDEA: XBRL DOCUMENT
v3.19.1

Investments (Details 3) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Investments [Line Items] |  |
Changes in accounting policies (IFRS 9) | € 681 |
Net book amount at the beginning of the year | 219 | € 276
Additions and subscriptions | 5 | 3
Change in the fair value | 15 |
Divestments and reimbursements | (22) | (19)
Currency translation differences | 31 | (23)
Other changes | (10) | (18)
Net book amount at the Ending of the year | 919 | 219
Gross carrying amount [member] |  |
Disclosure Of Investments [Line Items] |  |
Net book amount at the beginning of the year | € 219 | 276
Net book amount at the Ending of the year |  | € 219

X
- Definition The amount of additions to investments other than investments accounted for using equity method. + References No definition available. + Details
Name: | e_AdditionsAndSubscriptionsInInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod
Namespace Prefix: | e_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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

X
- Definition Represents the changes in investments other than investments accounted for using equity method investments, through change in accounting policy. + References No definition available. + Details
Name: | e_ChangesInInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethodThroughChangeInAccountingPolicy
Namespace Prefix: | e_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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

X
- Definition The amount of divestments and reimbursements to investments other than investments accounted for using equity method. + References No definition available. + Details
Name: | e_DivestmentsAndReimbursementInInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod
Namespace Prefix: | e_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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

X
- Definition The increase (decrease) through net exchange differences investments other than investments accounted for 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_IncreaseDecreaseThroughNetExchangeDifferencesInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod
Namespace Prefix: | e_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of investments other than investments accounted for using the equity method. [Refer: Investments accounted for using equity method] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_InvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis=ifrs-full_GrossCarryingAmountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |