XML 161 R154.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Other financial assets (Details 2) - Securities held for operating purposes [Member] € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 EUR (€)
DisclosureOfFinancialAssetsExplanatoryLineItems [Line Items] |
Financial assets at amortised cost | € 73
Nominal Amount | 71
Financial assets, at fair value | 74
Quoted bonds issued by sovereign states, Fixed rate bonds [Member] | Italy [Member] |
DisclosureOfFinancialAssetsExplanatoryLineItems [Line Items] |
Financial assets at amortised cost | 24
Nominal Amount | 25
Financial assets, at fair value | € 26
Financial Assets, Maturity Date | from 2018 to 2025
External rating by moody's, grade | Baa2
External rating by SP, grade | BBB-
Quoted bonds issued by sovereign states, Fixed rate bonds [Member] | Italy [Member] | Bottom Of Range [Member] |
DisclosureOfFinancialAssetsExplanatoryLineItems [Line Items] |
Financial Assets, Nominal Rate Of Return | 0.35%
Quoted bonds issued by sovereign states, Fixed rate bonds [Member] | Italy [Member] | Top Of Range [Member] |
DisclosureOfFinancialAssetsExplanatoryLineItems [Line Items] |
Financial Assets, Nominal Rate Of Return | 4.75%
Quoted bonds issued by sovereign states, Fixed rate bonds [Member] | Spain [Member] |
DisclosureOfFinancialAssetsExplanatoryLineItems [Line Items] |
Financial assets at amortised cost | € 15
Nominal Amount | 14
Financial assets, at fair value | € 15
Financial Assets, Maturity Date | from 2019 to 2020
External rating by moody's, grade | Baa2
External rating by SP, grade | BBB+
Quoted bonds issued by sovereign states, Fixed rate bonds [Member] | Spain [Member] | Bottom Of Range [Member] |
DisclosureOfFinancialAssetsExplanatoryLineItems [Line Items] |
Financial Assets, Nominal Rate Of Return | 1.40%
Quoted bonds issued by sovereign states, Fixed rate bonds [Member] | Spain [Member] | Top Of Range [Member] |
DisclosureOfFinancialAssetsExplanatoryLineItems [Line Items] |
Financial Assets, Nominal Rate Of Return | 4.30%
Quoted bonds issued by sovereign states, Fixed rate bonds [Member] | Ireland [Member] |
DisclosureOfFinancialAssetsExplanatoryLineItems [Line Items] |
Financial assets at amortised cost | € 9
Nominal Amount | 8
Financial assets, at fair value | € 9
Financial Assets, Nominal Rate Of Return | 4.50%
Financial Assets, Maturity Date | 2018
External rating by moody's, grade | A2
External rating by SP, grade | A+
Quoted bonds issued by sovereign states, Fixed rate bonds [Member] | Iceland [Member] |
DisclosureOfFinancialAssetsExplanatoryLineItems [Line Items] |
Financial assets at amortised cost | € 3
Nominal Amount | 3
Financial assets, at fair value | € 3
Financial Assets, Nominal Rate Of Return | 2.50%
Financial Assets, Maturity Date | 2020
External rating by moody's, grade | A3
External rating by SP, grade | A
Quoted bonds issued by sovereign states, Fixed rate bonds [Member] | Poland [Member] |
DisclosureOfFinancialAssetsExplanatoryLineItems [Line Items] |
Financial assets at amortised cost | € 2
Nominal Amount | 2
Financial assets, at fair value | € 2
Financial Assets, Nominal Rate Of Return | 4.20%
Financial Assets, Maturity Date | 2020
External rating by moody's, grade | A2
External rating by SP, grade | BBB+
Quoted bonds issued by sovereign states, Fixed rate bonds [Member] | Slovenia [Member] |
DisclosureOfFinancialAssetsExplanatoryLineItems [Line Items] |
Financial assets at amortised cost | € 2
Nominal Amount | 2
Financial assets, at fair value | € 2
Financial Assets, Nominal Rate Of Return | 4.13%
Financial Assets, Maturity Date | 2020
External rating by moody's, grade | Baa1
External rating by SP, grade | A+
Quoted bonds issued by sovereign states, Fixed rate bonds [Member] | Belgium [Member] |
DisclosureOfFinancialAssetsExplanatoryLineItems [Line Items] |
Financial assets at amortised cost | € 2
Nominal Amount | 2
Financial assets, at fair value | € 2
Financial Assets, Nominal Rate Of Return | 1.40%
Financial Assets, Maturity Date | 2018
External rating by moody's, grade | Aa3
External rating by SP, grade | AA
Quoted bonds issued by sovereign states, Floating rate bonds [Member] | Italy [Member] |
DisclosureOfFinancialAssetsExplanatoryLineItems [Line Items] |
Financial assets at amortised cost | € 12
Nominal Amount | 11
Financial assets, at fair value | € 11
Financial Assets, Maturity Date | from 2018 to 2019
External rating by moody's, grade | Baa2
External rating by SP, grade | BBB
Quoted bonds issued by sovereign states [Member] |
DisclosureOfFinancialAssetsExplanatoryLineItems [Line Items] |
Financial assets at amortised cost | € 69
Nominal Amount | 67
Financial assets, at fair value | 70
European Investment Bank Bonds [Member] |
DisclosureOfFinancialAssetsExplanatoryLineItems [Line Items] |
Financial assets at amortised cost | 4
Nominal Amount | 4
Financial assets, at fair value | € 4
Financial Assets, Maturity Date | 2018
External rating by moody's, grade | Aaa
External rating by SP, grade | AAA

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

X
- Definition The credit grades that have been provided by Moody's. + References No definition available. + Details
Name: | E_ExternalRatingByMoodysGrade
Namespace Prefix: | E_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The credit grades that have been provided by Standard and Poor's Ratings. + References No definition available. + Details
Name: | E_ExternalRatingBySpGrade
Namespace Prefix: | E_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The maturity date of the securities. + References No definition available. + Details
Name: | E_FinancialAssetsMaturityDate
Namespace Prefix: | E_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition It represent the financial assets, nominal rate of return of securities. + References No definition available. + Details
Name: | E_FinancialAssetsNominalRateOfReturn
Namespace Prefix: | E_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represent the nominal amount. + References No definition available. + Details
Name: | E_NominalAmount
Namespace Prefix: | E_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of financial assets at amortised cost. The amortised cost is the amount at which financial assets are measured at initial recognition minus principal repayments, plus or minus the cumulative amortisation using the effective interest method of any difference between that initial amount and the maturity amount, and adjusted for any impairment. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 8 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_8_f&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_FinancialAssetsAtAmortisedCost
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The fair value of financial assets. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_25&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_FinancialAssetsAtFairValue
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | ifrs-full_CategoriesOfFinancialAssetsAxis=ifrs-full_HeldtomaturityInvestmentsCategoryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=E_QuotedbondsissuedbysovereignstatesFixedratebondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=E_ItalyMember
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_GeographicalAreasAxis=E_SpainMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=E_IrelandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=E_IcelandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=E_PolandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=E_SloveniaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=E_BelgiumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=E_QuotedbondsissuedbysovereignstatesFloatingratebondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=E_QuotedbondsissuedbysovereignstatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=E_EuropeanInvestmentBankBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |