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Investments (Details 1) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
DisclosureOfInvestmentsLineItems [Line Items] |  |
Share Of Profit Of Equity Accounted Investments | € 124 | € 77
Deduction For Dividends | (86) | (100)
Eni BTC Ltd [Member] |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |
Share Of Profit Of Equity Accounted Investments |  | € 6
Deduction For Dividends | € 27 |
% of the investment in unconsolidated entities | 100.00% | 100.00%
Angola LNG Ltd [Member] |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |
Share Of Profit Of Equity Accounted Investments | € 45 |
% of the investment in associates | 13.60% | 13.60%
PetroJunin SA [Member] |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |
Share Of Profit Of Equity Accounted Investments | € 26 | € 30
% of the investment in joint ventures | 40.00% | 40.00%
United Gas Derivatives Co [Member] |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |
Share Of Profit Of Equity Accounted Investments | € 16 | € 14
Deduction For Dividends | € 12 | € 14
% of the investment in associates | 33.33% | 33.33%
Gas Distribution Company of Thessaloniki [Member] |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |
Share Of Profit Of Equity Accounted Investments | € 9 | € 10
Deduction For Dividends | € 12 | € 10
% of the investment in joint ventures | 49.00% | 49.00%
PetroSucre SA [Member] |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |
Deduction For Dividends |  | € 30
% of the investment in associates |  | 26.00%
Unimar Llc [Member] |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |
Share Of Profit Of Equity Accounted Investments | € 3 |
Deduction For Dividends | € 24 | € 16
% of the investment in joint ventures | 50.00% | 50.00%
Other Related Parties [Member] |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |
Share Of Profit Of Equity Accounted Investments | € 25 | € 17
Deduction For Dividends | € 11 | € 30

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