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Investments - Net carrying amount (Details) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Investments
Book value	€ 12,630	€ 12,092	€ 5,887
Associates
Investments
Book value	4,327	4,977
Associates | Var Energi ASA
Investments
Book value	€ 447	€ 763
% of the investment in associate	63.04%	63.08%
Associates | Abu Dhabi Oil Refining Company (Takreer)
Investments
Book value	€ 2,434	€ 2,497
% of the investment in associate	20.00%	20.00%
Associates | QatarEnergy LNG NFE (5)
Investments
Book value	€ 439	€ 302
% of the investment in associate	25.00%	25.00%
Associates | Coral FLNG SA
Investments
Book value	€ 239	€ 330
% of the investment in associate	25.00%	25.00%
Associates | Novamont SpA
Investments
Book value		€ 255
% of the investment in associate		35.00%
Associates | ADNOC Global Trading Ltd
Investments
Book value	€ 145	€ 158
% of the investment in associate	20.00%	20.00%
Associates | Novis Renewables Holdings Llc
Investments
Book value	€ 70	€ 74
% of the investment in associate	49.00%	49.00%
Associates | Bluebell Solar Class A Holdings II LlC
Investments
Book value	€ 70	€ 73
% of the investment in associate	99.00%	99.00%
Associates | United Gas Derivatives Co
Investments
Book value	€ 81	€ 72
% of the investment in associate	33.33%	33.33%
Associates | Altre
Investments
Book value	€ 402	€ 453
Joint ventures
Investments
Book value	8,250	7,065
Joint ventures | Mozambique Rovuma Venture SpA
Investments
Book value	€ 343	€ 308
% of the investment in joint venture	35.71%	35.71%
Joint ventures | Cardon IV SA
Investments
Book value	€ 443	€ 433
% of the investment in joint venture	50.00%	50.00%
Joint ventures | Azule Energy Holdings Ltd
Investments
Book value	€ 4,750	€ 5,073
% of the investment in joint venture	50.00%	50.00%
Joint ventures | St. Bernard Renewables Llc
Investments
Book value	€ 829
% of the investment in joint venture	50.00%
Joint ventures | Saipem SpA
Investments
Book value	€ 722	€ 645
% of the investment in joint venture	31.20%	31.20%
Joint ventures | SeaCorridor Srl
Investments
Book value	€ 530
% of the investment in joint venture	50.10%
Joint ventures | Vårgrønn AS
Investments
Book value	€ 336	€ 370
% of the investment in joint venture	65.00%	65.00%
Joint ventures | GreenIT SpA [member]
Investments
Book value	€ 92	€ 74
% of the investment in joint venture	51.00%	51.00%
Joint ventures | Lotte Versalis Elastomers Co Ltd
Investments
Book value	€ 43	€ 41
% of the investment in joint venture	50.00%	50.00%
Joint ventures | Hergo Renewables SpA [member]
Investments
Book value	€ 32	€ 33
% of the investment in joint venture	65.00%	65.00%
Joint ventures | LabAnalysis Environmental Scienze Srl
Investments
Book value	€ 25
% of the investment in joint venture	30.00%
Joint ventures | Societa Oleodotti Meridionali - SOM SpA
Investments
Book value	€ 21	€ 29
% of the investment in joint venture	70.00%	70.00%
Joint ventures | Altre
Investments
Book value	€ 84	€ 59
Investments in unconsolidated entities controlled by Eni
Investments
Book value	53	50
Investments in unconsolidated entities controlled by Eni | Altre
Investments
Book value	€ 53	€ 50

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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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