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It represents the changes in scope of consolidation.

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The percentage of country risk premium adopted by the reporting entity.

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The percentage of voting equity interests disposed.

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The power generating capacity, existing or in advanced development.

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The percentage of proportion of ownership interest acquired.

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The percentage of proportion of ownership interest divested in equity method investment.

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The gain (loss) recognised as result of remeasuring to fair value the equity interest in the acquiree held by the acquirer before the business combination. [Refer: Total for all business combinations [member]]

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The amount recognised as of the business combination's acquisition date for goodwill. [Refer: Goodwill; Total for all business combinations [member]]

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The amount of non-current investments other than investments accounted for using the equity method. [Refer: Investments accounted for using equity method; Non-current assets; Investments other than investments accounted for using equity method]

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The percentage of a reasonably possible increase in an unobservable input used in fair value measurement of assets.

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The proportion of ownership interest in an associate attributable to the entity. [Refer: Total for all associates [member]]

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

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Investments - Additional information (Details) € in Millions	12 Months Ended
	Dec. 31, 2024 EUR (€) GW MW	Dec. 31, 2023 EUR (€)	Dec. 31, 2022 EUR (€)
Investments
Additions and subscriptions	€ 727	€ 1,213
Share of loss of equity-accounted investments	316	281
Deduction for dividends	€ 1,752	2,000
Percentage of country risk premium	7.40%
Percentage of reasonable changes in cost of capital	1.00%
Other investments	€ 1,395	1,256	€ 1,202
Share of profit of equity-accounted investments	1,202	1,622
Changes in the scope of consolidation	650	(211)
Other changes	668	607
Purchase price goodwill recognition	33	25	482
Divestments and reimbursements	€ 326
Plenitude
Investments
Power generating capacity, existing or in advanced development \| MW	305
North Field East project (NFE)
Investments
Proportion of ownership interest acquired (as a percent)	3.125%
Nigeria LNG Ltd
Investments
Other investments	€ 690	642
Saudi European Petrochemical Co
Investments
Other investments	127	121
Darwin LNG Pty Ltd
Investments
Other investments	€ 96	€ 78
QatarEnergy LNG NFE (5) [member] \| North Field East project (NFE)
Investments
Proportion of ownership interest acquired (as a percent)	12.50%
Snam Group [Member] \| SeaCorridor Srl
Investments
Equity interest disposed (as a percent)		49.90%
Azule Energy Holdings Ltd
Investments
Capital gains from the fair value measurement of the business combination			€ 2,542
St. Bernard Renewables Llc
Investments
Purchase price goodwill recognition	€ 19
Novamont group
Investments
Changes in the scope of consolidation	632
Enilive SpA [Member] \| Biorefinery plants in South Korea and Malaysia
Investments
Additions and subscriptions	€ 64
Associates \| QatarEnergy LNG NFE (5) [member]
Investments
Proportion of ownership interest acquired (as a percent)	25.00%
Associates \| QatarEnergy LNG NFE (5) [member] \| North Field East project (NFE)
Investments
Additions and subscriptions	€ 160
Associates \| Abu Dhabi Oil Refining Co (Takreer)
Investments
Deduction for dividends	269
Associates \| Var Energi ASA
Investments
Deduction for dividends	627
Share of profit of equity-accounted investments	259
Associates \| Ithaca Energy Plc
Investments
Deduction for dividends	€ 69
Proportion of ownership interest in associate	37.17%
Other changes	€ 788
Associates \| ADNOC Global Trading Ltd
Investments
Deduction for dividends	102
Share of profit of equity-accounted investments	113
Associates \| Cardon IV SA
Investments
Deduction for dividends	€ 106
Associates \| Enilive SpA [Member] \| LG-Eni BioRefining Co Ltd [Member] \| Biorefinery plants in South Korea and Malaysia
Investments
Proportion of ownership interest in associate	49.00%
Associates \| Enilive SpA [Member] \| Pengerang Biorefinery SDN BHD [Member] \| Biorefinery plants in South Korea and Malaysia
Investments
Proportion of ownership interest in associate	47.50%
Joint ventures \| SeaCorridor Srl
Investments
Deduction for dividends	€ 95
Share of profit of equity-accounted investments	45
Joint ventures \| 2023 Sol IX Llc and 2022 Sol VII Llc \| Renewable activity in United States \| Plenitude
Investments
Additions and subscriptions	€ 212
Power generating capacity, existing or in advanced development \| GW	0.38
Joint ventures \| 2023 Sol IX Llc
Investments
Proportion of ownership interest in joint venture	73.59%
Joint ventures \| 2022 Sol VII Llc
Investments
Proportion of ownership interest in joint venture	75.26%
Joint ventures \| Vårgrønn AS
Investments
Share of loss of equity-accounted investments	€ 37
Proportion of ownership interest in joint venture	65.00%
Joint ventures \| Vårgrønn AS \| Offshore wind projects in United Kingdom
Investments
Additions and subscriptions	€ 90
Joint ventures \| Doggerbank Offshore Wind Farm Project 3 Holdco Ltd
Investments
Proportion of ownership interest acquired (as a percent)	20.00%
Joint ventures \| Mangistau Power B.V and Mangistau Renewables B.V. [Member]
Investments
Additions and subscriptions	€ 69
Joint ventures \| Mangistau Power B.V
Investments
Proportion of ownership interest in joint venture	51.00%
Joint ventures \| Mangistau Renewables B.V.
Investments
Proportion of ownership interest in joint venture	51.00%
Joint ventures \| Lotte Versalis Elastomers Co Ltd
Investments
Additions and subscriptions	€ 34
Proportion of ownership interest in joint venture	50.00%
Joint ventures \| Saipem SpA
Investments
Proportion of ownership interest divested in equity method investment	10.00%
Share of profit of equity-accounted investments	€ 75
Divestments and reimbursements	€ 227
Joint ventures \| E&E Algeria Touat BV
Investments
Proportion of ownership interest in joint venture	54.00%
Share of profit of equity-accounted investments	€ 40
Divestments and reimbursements	64
Joint ventures \| Abu Dhabi Oil Refining Co (Takreer)
Investments
Share of loss of equity-accounted investments	32
Joint ventures \| Azule Energy Holdings Ltd
Investments
Deduction for dividends	427
Share of profit of equity-accounted investments	602
Joint ventures \| St. Bernard Renewables Llc
Investments
Share of loss of equity-accounted investments	€ 45