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Investments - Market value of investments listed in regulated stock markets (Details) - EUR (€) € / shares in Units, € in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Investments
Net carrying amount	€ 6,749	€ 9,035	€ 7,044
Joint ventures
Investments
Net carrying amount	€ 2,832	€ 4,592
Joint ventures | Saipem SpA
Investments
Number of shares held	308,767,968
% of the investment	31.08%	30.99%
Share price	€ 2.205
Market value	€ 681
Net carrying amount	€ 908	€ 1,250

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Disclosure Of Investments

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Represents the number of shares held in entities.

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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 amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]]

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The proportion of the voting rights in a joint venture held by the entity. [Refer: Joint ventures [member]]

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