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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) - € / shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Dividends paid, ordinary shares per share | € 0.40 | € 0.40 | € 0.40
Dividends paid per share relating to prior year | 0.40 | 0.40 | 0.40
Interim dividends paid per share | € 0.42 | € 0.40 | € 0.40

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- Definition The amount of dividends paid per share relating to prior year. + References No definition available. + Details
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Namespace Prefix: | e_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of interim dividends paid per share. + References No definition available. + Details
Name: | e_InterimDividendsPaidPerShare
Namespace Prefix: | e_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of dividends paid per ordinary share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 34 -IssueDate 2018-01-01 -Paragraph 16A -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=34&date=2018-03-01&anchor=para_16A_f&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_DividendsPaidOrdinarySharesPerShare
Namespace Prefix: | ifrs-full_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration