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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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DisclosureOfIncomeExpenseFromInvestmentsTable

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The amount of dividends recognized as income.

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The gain on the disposal of investments.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The percentage of voting equity interests acquired in a business combination. [Refer: Business combinations [member]]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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