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Property, plant and equipment (Details 3) € in Millions | Dec. 31, 2018 EUR (€) bbl | Dec. 31, 2017 EUR (€) bbl | Dec. 31, 2016 EUR (€) bbl
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Disclosure Of Property Plant And Equipment Explanatory [Line Items] |  |  |
Costs capitalized and suspended for exploratory well activity | € | € 1,101 | € 1,263 | € 1,684
Costs capitalized and suspended for exploratory well activity, number of wells in Eni's interest | bbl | 34.10 | 33.26 | 32.85
within 1 year [Member] |  |  |
Disclosure Of Property Plant And Equipment Explanatory [Line Items] |  |  |
Costs capitalized and suspended for exploratory well activity | € | € 111 | € 222 | € 16
Costs capitalized and suspended for exploratory well activity, number of wells in Eni's interest | bbl | 7.02 | 7.95 | 1.05
between 1 and 3 years [Member] |  |  |
Disclosure Of Property Plant And Equipment Explanatory [Line Items] |  |  |
Costs capitalized and suspended for exploratory well activity | € | € 87 | € 241 | € 609
Costs capitalized and suspended for exploratory well activity, number of wells in Eni's interest | bbl | 2.88 | 3.87 | 10.25
beyond 3 years [Member] |  |  |
Disclosure Of Property Plant And Equipment Explanatory [Line Items] |  |  |
Costs capitalized and suspended for exploratory well activity | € | € 903 | € 800 | € 1,059
Costs capitalized and suspended for exploratory well activity, number of wells in Eni's interest | bbl | 24.20 | 21.44 | 21.55
fields including wells drilled over the last 12 months [Member] |  |  |
Disclosure Of Property Plant And Equipment Explanatory [Line Items] |  |  |
Costs capitalized and suspended for exploratory well activity | € | € 111 | € 148 | € 9
Costs capitalized and suspended for exploratory well activity, number of wells in Eni's interest | bbl | 7.02 | 5.88 | 0.55
fields for which the delineation campaign is in progress [Member] |  |  |
Disclosure Of Property Plant And Equipment Explanatory [Line Items] |  |  |
Costs capitalized and suspended for exploratory well activity | € | € 217 | € 261 | € 251
Costs capitalized and suspended for exploratory well activity, number of wells in Eni's interest | bbl | 4.66 | 4.69 | 3.51
fields including commercial discoveries that proceeds to sanctioning [Member] |  |  |
Disclosure Of Property Plant And Equipment Explanatory [Line Items] |  |  |
Costs capitalized and suspended for exploratory well activity | € | € 773 | € 854 | € 1,424
Costs capitalized and suspended for exploratory well activity, number of wells in Eni's interest | bbl | 22.42 | 22.69 | 28.79

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