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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, 2023	Dec. 31, 2022	Dec. 31, 2021
Investments
Book value	€ 12,630	€ 12,092	€ 5,887
Joint ventures
Investments
Book value	€ 8,250	€ 7,065
Joint ventures | Var Energi ASA | Ordinary shares
Investments
Share price		€ 2.86287
Joint ventures | Saipem SpA
Investments
% of the investment in joint venture	31.20%	31.20%
Book value	€ 722	€ 645
Joint ventures | Saipem SpA | Ordinary shares
Investments
Number of shares held	662,476,192
% of the investment in joint venture	31.20%
Share price	€ 1.47
Market value of joint venture	€ 915
Book value	722
Associates
Investments
Book value	€ 4,327	€ 4,977
Associates | Var Energi ASA
Investments
% of the investment in associate	63.04%	63.08%
Book value	€ 447	€ 763
Associates | Var Energi ASA | Ordinary shares
Investments
Number of shares held		1,573,713,749
% of the investment in associate		63.04%
Market value of associate		€ 4,505
Book value		€ 447

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Represents the number of shares held in entities.

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The price per share.

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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 reported in separate financial statements]

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The fair value of investments in associates if there are quoted market prices for the investment. [Refer: Associates [member]; Investments in associates reported in separate financial statements]

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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 an associate held by the entity. [Refer: Associates [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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