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Investments (Details 3) - EUR (€) € in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Net carrying amount |  | € 3,511 | € 4,040 | € 2,853
Associates [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Net carrying amount |  | 1,063 | 1,197 |
Associates [Member] | Other Related Parties [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Net carrying amount | [1] | 54 | 53 |
Joint Ventures [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Net carrying amount |  | € 2,332 | 2,675 |
% of the investment in joint ventures |  | 50.00% |  |
Unconsolidated Structured Entities [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Net carrying amount |  | € 116 | 168 | € 175
Eni BTC Ltd [Member] | Unconsolidated Structured Entities [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Net carrying amount |  | € 63 | € 106 |
Number of shares held |  | 34,000,000 | 34,000,000 |
% of the investment in unconsolidated entities controlled by Eni |  | 100.00% | 100.00% |
Other Related Parties [Member] | Joint Ventures [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Net carrying amount | [1] | € 76 | € 70 |
Other Related Parties [Member] | Unconsolidated Structured Entities [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Net carrying amount | [2] | € 53 | € 62 |
Union Fenosa Gas SA [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
% of the investment in joint ventures |  | 50.00% | 50.00% |
Union Fenosa Gas SA [Member] | Joint Ventures [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Net carrying amount |  | € 350 | € 434 |
Number of shares held |  | 273,100 | 273,100 |
% of the investment in joint ventures |  | 50.00% | 50.00% |
PetroJunin SA [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
% of the investment in joint ventures |  | 40.00% | 40.00% |
PetroJunin SA [Member] | Joint Ventures [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Net carrying amount |  | € 210 | € 211 |
Number of shares held |  | 96,084,000 | 96,084,000 |
% of the investment in joint ventures |  | 40.00% | 40.00% |
Cardon IV SA [Member] | Joint Ventures [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Net carrying amount |  |  | € 197 |
Number of shares held |  |  | 8,605 |
% of the investment in unconsolidated entities controlled by Eni |  |  | 50.00% |
Gas Distribution Company of Thessaloniki [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
% of the investment in joint ventures |  | 49.00% | 49.00% |
Gas Distribution Company of Thessaloniki [Member] | Joint Ventures [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Net carrying amount |  | € 137 | € 150 |
Number of shares held |  | 121,092,526 | 130,491,508 |
% of the investment in joint ventures |  | 49.00% | 49.00% |
Unimar Llc [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
% of the investment in joint ventures |  | 50.00% | 50.00% |
Unimar Llc [Member] | Joint Ventures [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Net carrying amount |  |  | € 42 |
Number of shares held |  |  | 50 |
% of the investment in unconsolidated entities controlled by Eni |  |  | 50.00% |
PetroBicentenario SA [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
% of the investment in joint ventures |  |  | 40.00% |
Angola LNG Ltd [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
% of the investment in associates |  | 13.60% | 13.60% |
Angola LNG Ltd [Member] | Associates [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Net carrying amount |  | € 802 | € 916 |
Number of shares held |  | 1,483,352,000 | 1,551,760,000 |
% of the investment in associates |  | 13.60% | 13.60% |
United Gas Derivatives Co [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
% of the investment in associates |  | 33.33% | 33.33% |
United Gas Derivatives Co [Member] | Associates [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Net carrying amount |  | € 82 | € 117 |
Number of shares held |  | 2,600,000 | 950,000 |
% of the investment in associates |  | 33.33% | 33.33% |
Novamont SpA [Member] | Associates [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Net carrying amount |  | € 71 | € 77 |
Number of shares held |  | 6,667 | 6,667 |
% of the investment in associates |  | 25.00% | 25.00% |
AET Raffineriebeteiligungsgesellschaft mbH [Member] | Associates [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Net carrying amount |  |  | € 34 |
Number of shares held |  |  | 1 |
% of the investment in associates |  |  | 33.33% |
AET Raffineriebeteiligungsgesellschaft mbH [Member] | Joint Ventures [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Net carrying amount |  | € 32 |  |
Number of shares held |  | 1 |  |
% of the investment in joint ventures |  | 33.33% |  |
PetroSucre SA [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
% of the investment in associates |  |  | 26.00% |
Saipem SpA [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Net carrying amount |  | € 1,413 |  |
% of the investment in joint ventures |  | 31.00% | 30.76% |
Saipem SpA [Member] | Joint Ventures [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Net carrying amount |  | € 1,413 | € 1,497 |
Number of shares held |  | 308,767,968 | 3,087,679,689 |
% of the investment in joint ventures |  | 31.00% | 30.76% |
Lotte Versalis Elastomers Co Ltd [Member] | Joint Ventures [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Net carrying amount |  | € 114 | € 74 |
Number of shares held |  | 30,179,999 | 19,200,000 |
% of the investment in joint ventures |  | 50.00% | 50.00% |
Coral FLNG SA [Member] | Associates [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Net carrying amount |  | € 54 |  |
Number of shares held |  | 2,500,000 |  |
% of the investment in associates |  | 25.00% |  |
[1] | Mainly refers to arrangements to purchase capacity entitlements at certain regasification facilities in the U.S. (&euro;948 million).
[2] | Each individual amount included herein was lower than &euro;25 million.

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