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Intangible assets - Additional information (Details) - EUR (€) € in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2003
Intangible assets |  |  |
Goodwill | € 1,265 | € 1,284 |
Period over which management has projected cash flows | 4 years |  |
France |  |  |
Intangible assets |  |  |
Discount rate applied to cash flow projections | 5.90% |  |
Greece |  |  |
Intangible assets |  |  |
Discount rate applied to cash flow projections | 6.20% |  |
Gas Distribution Company of Thessaloniki Thessaly SA |  |  |
Intangible assets |  |  |
Percentage of voting equity interests acquired |  | 51.00% |
CGU Domestic Gas Market |  |  |
Intangible assets |  |  |
Goodwill recognised as of acquisition date |  |  | € 706
Period over which management has projected cash flows | 4 years |  |
Growth rate used to extrapolate cash flow projections | 0.00% |  |
Amount by which unit's recoverable amount exceeds its carrying amount | € 1,701 |  |
CGU Domestic Gas Market | Italy |  |  |
Intangible assets |  |  |
Discount rate applied to cash flow projections | 5.30% |  |
CGU Foreign Gas Market | Gas Distribution Company of Thessaloniki Thessaly SA |  |  |
Intangible assets |  |  |
Goodwill | € 45 |  |
Percentage of voting equity interests acquired | 51.00% |  |
Percentage of voting equity interests before acquisition | 49.00% |  |
CGU Foreign Gas Market | Eni Gas and Power France SA |  |  |
Intangible assets |  |  |
Goodwill | € 95 |  |
Gross carrying amount |  |  |
Intangible assets |  |  |
Goodwill | 2,454 |  |
Capitalized costs for customer acquisition |  |  |
Intangible assets |  |  |
Intangible assets other than goodwill | 226 | € 166 |
Concessions, licenses, trademarks and similar items |  |  |
Intangible assets |  |  |
Intangible assets other than goodwill | 102 | 151 |
Transport rights of natural gas |  |  |
Intangible assets |  |  |
Intangible assets other than goodwill | 30 | 27 |
Intangible assets in progress |  |  |
Intangible assets |  |  |
Intangible assets other than goodwill | € 78 | € 78 |

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- Definition The amount by which a cash-generating unit's (group of units') recoverable amount exceeds its carrying amount. [Refer: Carrying amount [member]; Cash-generating units [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2019-01-01 -Paragraph 134 -Subparagraph f -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2019-en-r&anchor=para_134_f_i&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2019-01-01 -Paragraph 135 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2019-en-r&anchor=para_135_e_i&doctype=Standard -URIDate 2019-03-27 + Details
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