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Income (expense) from investments (Details Textual) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Income Expense From Investments [Line Items] |  |  |
Dividends | € 231 | € 205 | € 143
Percentage of voting equity interests acquired | 69.60% |  |
Nigeria LNG Ltd [Member] |  |  |
Disclosure Of Income Expense From Investments [Line Items] |  |  |
Dividends |  | € 35 |
Eni norge AS [Member] |  |  |
Disclosure Of Income Expense From Investments [Line Items] |  |  |
Gains on disposals of investments | € 889 |  |

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- Definition The gain on the disposal of investments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 98 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_98_d&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The percentage of voting equity interests acquired in a business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B64 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_c&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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