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Intangible assets - Additional information (Details) - EUR (€) € in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2003
Intangible assets |  |  |  |
Goodwill | € 1,297 | € 1,265 |  |
France |  |  |  |
Intangible assets |  |  |  |
Discount rate applied to cash flow projections | 4.60% |  |  |
Greece |  |  |  |
Intangible assets |  |  |  |
Discount rate applied to cash flow projections | 4.80% |  |  |
Gas Distribution Company of Thessaloniki Thessaly SA |  |  |  |
Intangible assets |  |  |  |
Percentage of voting equity interests acquired |  |  | 51.00% |
Evolvere |  |  |  |
Intangible assets |  |  |  |
Goodwill recognised as of acquisition date | € 66 |  |  |
Percentage of voting equity interests acquired | 70.00% |  |  |
CGU Domestic 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 | € 2,856 |  |  |
CGU Domestic Market | Italy |  |  |  |
Intangible assets |  |  |  |
Discount rate applied to cash flow projections | 4.30% |  |  |
CGU Foreign 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 Market | Eni Gas and Power France SA |  |  |  |
Intangible assets |  |  |  |
Goodwill | 95 |  |  |
Accumulated impairment |  |  |  |
Intangible assets |  |  |  |
Goodwill | (2,457) |  |  |
Capitalized costs for customer acquisition |  |  |  |
Intangible assets |  |  |  |
Intangible assets other than goodwill | 262 | 226 |  |
Concessions, licenses, trademarks and similar items |  |  |  |
Intangible assets |  |  |  |
Intangible assets other than goodwill | 88 | 102 |  |
Transport rights of natural gas |  |  |  |
Intangible assets |  |  |  |
Intangible assets other than goodwill | 25 | 30 |  |
Intangible assets in progress |  |  |  |
Intangible assets |  |  |  |
Intangible assets other than goodwill | € 78 | € 78 |  |

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