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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

X

- 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

Name:	ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesAllowanceAccountForCreditLossesOfFinancialAssets
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

Name:	ifrs-full_IncreaseDecreaseThroughOtherChangesAllowanceAccountForCreditLossesOfFinancialAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	ifrs-full_AssetsAndLiabilitiesAxis=E_OtherNoncurrentFinancialAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: