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Property, plant and equipment (Details 5) € in Millions | Dec. 31, 2017 EUR (€) € / shares | Dec. 31, 2016 EUR (€) € / shares | Dec. 31, 2015 EUR (€) € / shares
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DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |  |
Costs capitalized and suspended for exploratory well activity | € | € 1,263 | € 1,684 | € 1,737
Costs capitalized and suspended for exploratory well activity, number of wells in Eni's interest | € / shares | 33.26 | 32.85 | 35.43
fields including wells drilled over the last 12 months [member] |  |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |  |
Costs capitalized and suspended for exploratory well activity | € | € 148 | € 9 | € 368
Costs capitalized and suspended for exploratory well activity, number of wells in Eni's interest | € / shares | 5.88 | 0.55 | 5.32
Delineation campaign in progress [Member] |  |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |  |
Costs capitalized and suspended for exploratory well activity | € | € 261 | € 251 | € 228
Costs capitalized and suspended for exploratory well activity, number of wells in Eni's interest | € / shares | 4.69 | 3.51 | 4.13
Commercial Discoveries in Progress [Member] |  |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |  |
Costs capitalized and suspended for exploratory well activity | € | € 854 | € 1,424 | € 1,141
Costs capitalized and suspended for exploratory well activity, number of wells in Eni's interest | € / shares | 22.69 | 28.79 | 25.98
Not later than one year [member] |  |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |  |
Costs capitalized and suspended for exploratory well activity | € | € 222 | € 16 | € 368
Costs capitalized and suspended for exploratory well activity, number of wells in Eni's interest | € / shares | 7.95 | 1.05 | 5.32
Later Than One Year And Not Later Than Three Years [Member] |  |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |  |
Costs capitalized and suspended for exploratory well activity | € | € 241 | € 609 | € 634
Costs capitalized and suspended for exploratory well activity, number of wells in Eni's interest | € / shares | 3.87 | 10.25 | 11.14
Later Than Three Years And Not Later Than Five Years [Member] |  |  |
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items] |  |  |
Costs capitalized and suspended for exploratory well activity | € | € 800 | € 1,059 | € 735
Costs capitalized and suspended for exploratory well activity, number of wells in Eni's interest | € / shares | 21.44 | 21.55 | 18.97

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