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Other financial assets (Details 1) - Other Noncurrent Financial Assets [Member] € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 EUR (€)
DisclosureOfFinancialAssetsExplanatoryLineItems [Line Items] |
Carrying amount, Beginning of period | € 480
Additions | 211
Currency translation differences | (49)
Other changes | (2)
Carrying amount, end of period | € 640

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- Definition The amount of additional in an allowance account for credit losses of financial assets. + References No definition available. + Details
Name: | E_AdditionalAllowanceForCreditLossesOfFinancialAssets
Namespace Prefix: | E_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount at the beginning of the period of accumulated impairment losses of financial assets. + References No definition available. + Details
Name: | E_AllowanceAccountForCreditLossesOfFinancialAssetsAtBeginningOfPeriod
Namespace Prefix: | E_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount at the end of the period of accumulated impairment losses of financial assets. + References No definition available. + Details
Name: | E_AllowanceAccountForCreditLossesOfFinancialAssetsAtTheEndOfPeriod
Namespace Prefix: | E_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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 increase (decrease) in an allowance account for credit losses of financial assets resulting from the net exchange differences arising when the financial statements are translated from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Allowance account for credit losses of financial assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_16&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) in allowance account for credit losses of financial assets resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Allowance account for credit losses of financial assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_16&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | ifrs-full_AssetsAndLiabilitiesAxis=E_OtherNoncurrentFinancialAssetsMember
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Data Type: | na
Balance Type: |
Period Type: |