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Intangible assets (Details Textual) - EUR (€) € in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items] |  |  |
Intangible exploration and evaluation assets | € 995 | € 1,092 | € 735
Concessions licenses trademarks and similar item | 182 | 255 |
Copyrights, patents and other industrial property rights, service and operating rights | 240 | 259 |
Intangible assets under development | 134 | 148 |
Other intangible assets | 140 | 164 |
Goodwill | 1,204 | 1,320 |
Increase decrease through other changes intangible assets and goodwill | (102) | 9 |
Intangible Assets With Indefinite Useful Life [Member] |  |  |
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items] |  |  |
Increase decrease through other changes intangible assets and goodwill | (93) |  |
Accumulated impairment [member] |  |  |
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items] |  |  |
Goodwill | 2,414 | 2,524 |
Licenses by Versalis SpA [Member] |  |  |
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items] |  |  |
Other intangible assets | 37 | 40 |
Mineral Rights Under Concession [Member] |  |  |
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items] |  |  |
Other intangible assets | 35 | 41 |
Internally Generated [Member] |  |  |
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items] |  |  |
Copyrights, patents and other industrial property rights, service and operating rights | 108 | 235 |
Intangible assets under development | 78 | 89 |
Internally Generated [Member] | Eni gas e luce SpA [member] |  |  |
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items] |  |  |
Copyrights, patents and other industrial property rights, service and operating rights | 121 |  |
Transmission Rights for Natural Gas [Member] |  |  |
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items] |  |  |
Concessions licenses trademarks and similar item | 141 | 223 |
Signature bonus and licenses [Member] |  |  |
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items] |  |  |
Additions Other Than Through Business Combinations Intangible Assets Other Than Goodwill | € 91 | € 15 |

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