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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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- Definition 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] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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