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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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The price per share.

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- Definition

The fair value of investments in joint ventures if there are quoted market prices for the investment. [Refer: Joint ventures [member]; Investments in joint ventures]

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The proportion of ownership interest in a joint venture attributable to the entity. [Refer: Joint ventures [member]]

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The number of shares in the entity held by the entity or by its subsidiaries or associates. [Refer: Associates [member]; Subsidiaries [member]]

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