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Intangible assets (Details Textual) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 EUR (€) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 EUR (€)
Disclosure Of Intangible Assets Explanatory [Line Items] |  |  |
Goodwill |  |  | € 1,204
Proportion of ownership interest in subsidiary | 80.00% | 80.00% |
Impairment loss | € 1,701 |  | € 913
Impairment Loss Hypothesis Used | a decrease of 63% on average in the projected volumes or commercial margins; (ii) an increase of 12.1 percentage points in the discount rate; and (iii) a final negative nominal growth rate of 26.2%. | a decrease of 63% on average in the projected volumes or commercial margins; (ii) an increase of 12.1 percentage points in the discount rate; and (iii) a final negative nominal growth rate of 26.2%. |
Acquisitions through business combinations, intangible assets and goodwill | € 45 |  |
CGU Domestic Gas Market [Member] |  |  |
Disclosure Of Intangible Assets Explanatory [Line Items] |  |  |
Goodwill | € 706 |  |
Foreign countries [member] |  |  |
Disclosure Of Intangible Assets Explanatory [Line Items] |  |  |
Discount rate applied to cash flow projections | 5.40% |  |
Tax rate effect of impairment of goodwill | 6.10% | 6.10% |
ThessalonikiThessalia SA [Member] |  |  |
Disclosure Of Intangible Assets Explanatory [Line Items] |  |  |
Proportion of ownership interest in subsidiary | 49.00% | 49.00% |
Acquisitions through business combinations, intangible assets and goodwill | $ |  | $ 51 |
Eni Gas & Power France SA [Member] |  |  |
Disclosure Of Intangible Assets Explanatory [Line Items] |  |  |
Acquisitions through business combinations, intangible assets and goodwill | $ |  | $ 95 |
Customer-Related Intangible Assets [Member] | Retail Gas [Member] |  |  |
Disclosure Of Intangible Assets Explanatory [Line Items] |  |  |
Intangible assets other than goodwill | € 166 |  |
Licences and franchises [member] |  |  |
Disclosure Of Intangible Assets Explanatory [Line Items] |  |  |
Intangible assets other than goodwill | 151 |  |
Licences and franchises [member] | Gas Imports [Member] |  |  |
Disclosure Of Intangible Assets Explanatory [Line Items] |  |  |
Intangible assets other than goodwill | 27 |  |
Intangible assets under development [member] |  |  |
Disclosure Of Intangible Assets Explanatory [Line Items] |  |  |
Intangible assets other than goodwill | € 78 |  |

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- Definition The increase in intangible assets and goodwill resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Intangible assets and goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2018-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118_e_i&doctype=Standard -URIDate 2018-03-16 + Details
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