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Finance income (expense) (Details Textual) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
DisclosureOfFinanceIncomeExpenseExplanatoryLineItems [Line Items]
Interest income on financial assets designated at fair value through profit or loss	€ 837	€ (482)	€ 160
Fair Value Of The Option Embedded	€ 2
Options [Member]
DisclosureOfFinanceIncomeExpenseExplanatoryLineItems [Line Items]
Interest income on financial assets designated at fair value through profit or loss		24	33
Snam SpA [Member]
DisclosureOfFinanceIncomeExpenseExplanatoryLineItems [Line Items]
Fair Value Of The Option Embedded		€ 26	€ 33

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The amount of interest income on financial assets designated at fair value through profit or loss. [Refer: Interest income; Financial assets at fair value through profit or loss, designated upon initial recognition or subsequently]

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 112
-Subparagraph c
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-URIDate 2017-03-09

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