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Investments (Details 2) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
DisclosureOfInvestmentsLineItems [Line Items] |  |
Share of loss of equity accounted investments | € (353) | € (370)
Saipem SpA [Member] |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |
Share of loss of equity accounted investments | € 101 | € 144
% of the investment in joint ventures | 31.00% | 30.76%
PetroSucre SA [Member] |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |
Share of loss of equity accounted investments |  | € 92
% of the investment in associates |  | 26.00%
Angola LNG Ltd [Member] |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |
Share of loss of equity accounted investments |  | € 62
% of the investment in associates | 13.60% | 13.60%
PetroBicentenario SA [Member] |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |
Share of loss of equity accounted investments |  | € 26
% of the investment in joint ventures |  | 40.00%
Cardon IV SA One [Member] |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |
Share of loss of equity accounted investments | € 184 | € 20
% of the investment in joint ventures | 50.00% | 50.00%
Matrica SpA [Member] |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |
Share of loss of equity accounted investments | € 17 | € 4
% of the investment in joint ventures | 50.00% | 50.00%
Union Fenosa Gas SA [Member] |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |
Share of loss of equity accounted investments | € 28 |
% of the investment in joint ventures | 50.00% | 50.00%
Unimar Llc [Member] |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |
% of the investment in joint ventures | 50.00% | 50.00%
Other Related Parties [Member] |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |
Share of loss of equity accounted investments | € 23 | € 22

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