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Investments (Details 4) - EUR (€) € / shares in Units, € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Saipem SpA [Member] |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |
% of the investment | 31.00% | 30.76%
Joint Ventures [Member] |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |
% of the investment | 50.00% |
Joint Ventures [Member] | Saipem SpA [Member] |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |
Number of shares held | 308,767,968 | 3,087,679,689
% of the investment | 31.00% | 30.76%
Share price | € 3.806 |
Market value | € 1,175 |

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