Other information about investments - Subsidiaries - Global Gas & LNG Portfolio (Details) - EUR (€)	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Subsidiaries
Share capital	€ 4,005,000,000	€ 4,005,000,000
ENI SpA
Subsidiaries
Share capital	€ 4,005,358,876	€ 4,005,358,876
Foreign (outside Italy) \| Subsidiaries Five [Member]
Subsidiaries
Company name	Oleodotto del Reno SA
Global Gas & LNG Portfolio \| Italy \| Subsidiaries One [Member]
Subsidiaries
Company name	Eni Gas Transport Services Srl
Registered office	San Donato Milanese (MI)
Country of operation	Italy
Share capital	€ 120,000
Consolidation or valuation method	Co.
Global Gas & LNG Portfolio \| Italy \| Subsidiaries One [Member] \| ENI SpA
Subsidiaries
% Ownership	100.00%
Global Gas & LNG Portfolio \| Italy \| Subsidiaries Two [Member]
Subsidiaries
Company name	Eni Global Energy Markets SpA
Registered office	Rome
Country of operation	Italy
Share capital	€ 41,233,720
% Equity ratio	100.00%
Consolidation or valuation method	F.C.
Global Gas & LNG Portfolio \| Italy \| Subsidiaries Two [Member] \| ENI SpA
Subsidiaries
% Ownership	100.00%
Global Gas & LNG Portfolio \| Italy \| Subsidiaries Three [Member]
Subsidiaries
Company name	LNG Shipping SpA
Registered office	San Donato Milanese (MI)
Country of operation	Italy
Share capital	€ 240,900,000
% Equity ratio	100.00%
Consolidation or valuation method	F.C.
Global Gas & LNG Portfolio \| Italy \| Subsidiaries Three [Member] \| ENI SpA
Subsidiaries
% Ownership	100.00%
Global Gas & LNG Portfolio \| Foreign (outside Italy) \| Subsidiaries Four [Member]
Subsidiaries
Company name	Eni España Comercializadora de Gas SAU
Registered office	Madrid (Spain)
Country of operation	Spain
Share capital	€ 2,340,240
% Equity ratio	100.00%
Consolidation or valuation method	F.C.
Global Gas & LNG Portfolio \| Foreign (outside Italy) \| Subsidiaries Four [Member] \| ENI SpA
Subsidiaries
% Ownership	100.00%
Global Gas & LNG Portfolio \| Foreign (outside Italy) \| Subsidiaries Five [Member]
Subsidiaries
Company name	Eni G&P Trading BV
Registered office	Amsterdam (Netherlands)
Country of operation	Turkey
Share capital	€ 70,000
% Equity ratio	100.00%
Consolidation or valuation method	F.C.
Global Gas & LNG Portfolio \| Foreign (outside Italy) \| Subsidiaries Five [Member] \| Eni International BV
Subsidiaries
% Ownership	100.00%
Global Gas & LNG Portfolio \| Foreign (outside Italy) \| Subsidiaries Six [Member]
Subsidiaries
Company name	Eni Gas Liquefaction BV
Registered office	Amsterdam (Netherlands)
Country of operation	Netherlands
Share capital	€ 20,000
% Equity ratio	100.00%
Consolidation or valuation method	F.C.
Global Gas & LNG Portfolio \| Foreign (outside Italy) \| Subsidiaries Six [Member] \| Eni International BV
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