Other information about investments - Subsidiaries - Corporate and other activities (Details)	12 Months Ended
Dec. 31, 2024
Subsidiaries
Company name	Eni Marine Services SpA
Corporate and financial companies \| Italy \| Subsidiaries One [Member]
Subsidiaries
Company name	Agenzia Giornalistica Italia SpA
Registered office	Rome
Country of operation	Italy
% Equity ratio	100.00%
Corporate and financial companies \| Italy \| Subsidiaries One [Member] \| ENI SpA
Subsidiaries
% Ownership	100.00%
Corporate and financial companies \| Italy \| Subsidiaries Two [Member]
Subsidiaries
Company name	D-Share SpA
Registered office	San Donato Milanese (MI)
Country of operation	Italy
% Equity ratio	100.00%
Corporate and financial companies \| Italy \| Subsidiaries Two [Member] \| AGI SpA
Subsidiaries
% Ownership	100.00%
Corporate and financial companies \| Italy \| Subsidiaries Three [Member]
Subsidiaries
Company name	Eni Corporate University SpA
Registered office	San Donato Milanese (MI)
Country of operation	Italy
% Equity ratio	100.00%
Corporate and financial companies \| Italy \| Subsidiaries Three [Member] \| ENI SpA
Subsidiaries
% Ownership	100.00%
Corporate and financial companies \| Italy \| Subsidiaries Four [Member]
Subsidiaries
Company name	Eni Insurance SpA
Registered office	Rome
Country of operation	Italy
% Equity ratio	100.00%
Corporate and financial companies \| Italy \| Subsidiaries Four [Member] \| ENI SpA
Subsidiaries
% Ownership	100.00%
Corporate and financial companies \| Italy \| Subsidiaries Five [Member]
Subsidiaries
Company name	EniServizi SpA
Registered office	San Donato Milanese (MI)
Country of operation	Italy
% Equity ratio	100.00%
Corporate and financial companies \| Italy \| Subsidiaries Five [Member] \| ENI SpA
Subsidiaries
% Ownership	100.00%
Corporate and financial companies \| Italy \| Subsidiaries Six [Member]
Subsidiaries
Company name	Eniverse Ventures Srl
Registered office	San Donato Milanese (MI)
Country of operation	Italy
% Equity ratio	100.00%
Corporate and financial companies \| Italy \| Subsidiaries Six [Member] \| ENI SpA
Subsidiaries
% Ownership	100.00%
Corporate and financial companies \| Italy \| Subsidiaries Seven [Member]
Subsidiaries
Company name	Enivibes Srl
Registered office	Vimodrone (MI)
Country of operation	Italy
% Equity ratio	76.00%
Corporate and financial companies \| Italy \| Subsidiaries Seven [Member] \| Eniverse
Subsidiaries
% Ownership	76.00%
Corporate and financial companies \| Italy \| Subsidiaries Seven [Member] \| Third parties
Subsidiaries
% Ownership	24.00%
Corporate and financial companies \| Italy \| Subsidiaries Eight [Member]
Subsidiaries
Company name	Servizi Aerei SpA
Registered office	San Donato Milanese (MI)
Country of operation	Italy
% Equity ratio	100.00%
Corporate and financial companies \| Italy \| Subsidiaries Eight [Member] \| ENI SpA
Subsidiaries
% Ownership	100.00%
Corporate and financial companies \| Foreign (outside Italy) \| Subsidiaries Nine [Member]
Subsidiaries
Company name	Banque Eni SA
Registered office	Bruxelles (Belgium)
Country of operation	Belgium
% Equity ratio	100.00%
Corporate and financial companies \| Foreign (outside Italy) \| Subsidiaries Nine [Member] \| Eni International BV
Subsidiaries
% Ownership	99.90%
Corporate and financial companies \| Foreign (outside Italy) \| Subsidiaries Nine [Member] \| Eni Oil Holdings BV
Subsidiaries
% Ownership	0.10%
Corporate and financial companies \| Foreign (outside Italy) \| Subsidiaries Ten [Member]
Subsidiaries
Company name	Eni Finance USA Inc
Registered office	Dover (USA)
Country of operation	USA
% Equity ratio	100.00%
Corporate and financial companies \| Foreign (outside Italy) \| Subsidiaries Ten [Member] \| Eni Petroleum Co Inc
Subsidiaries
% Ownership	100.00%
Corporate and financial companies \| Foreign (outside Italy) \| Subsidiaries Eleven [Member]
Subsidiaries
Company name	Eni Insurance DAC
Registered office	Dublin (Ireland)
Country of operation	Ireland
% Equity ratio	100.00%
Corporate and financial companies \| Foreign (outside Italy) \| Subsidiaries Eleven [Member] \| ENI SpA
Subsidiaries
% Ownership	100.00%
Corporate and financial companies \| Foreign (outside Italy) \| Subsidiaries Twelve [Member]
Subsidiaries
Company name	Eni International BV
Registered office	Amsterdam (Netherlands)
Country of operation	Netherlands
% Equity ratio	100.00%
Corporate and financial companies \| Foreign (outside Italy) \| Subsidiaries Twelve [Member] \| ENI SpA
Subsidiaries
% Ownership	100.00%
Corporate and financial companies \| Foreign (outside Italy) \| Subsidiaries Thirteen [Member]
Subsidiaries
Company name	Eni International Resources Ltd
Registered office	London (United Kingdom)
Country of operation	United Kingdom
% Equity ratio	100.00%
Corporate and financial companies \| Foreign (outside Italy) \| Subsidiaries Thirteen [Member] \| ENI SpA
Subsidiaries
% Ownership	99.99%
Corporate and financial companies \| Foreign (outside Italy) \| Subsidiaries Fourteen [Member]
Subsidiaries
Company name	Eni Next Llc
Registered office	Dover (USA)
Country of operation	USA
% Equity ratio	100.00%
Corporate and financial companies \| Foreign (outside Italy) \| Subsidiaries Fourteen [Member] \| Eni Petroleum Co Inc
Subsidiaries
% Ownership	100.00%
Other activities \| Italy \| Subsidiaries One [Member]
Subsidiaries
Company name	Eni Rewind SpA
Registered office	San Donato Milanese (MI)
Country of operation	Italy
% Equity ratio	100.00%
Other activities \| Italy \| Subsidiaries One [Member] \| Eni Rewind SpA
Subsidiaries
% Ownership	99.99%

The percentage of equity ratio.

No definition available.

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- Definition

The address at which the entity's office is registered.

+ References

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The name of a subsidiary. [Refer: Total for all subsidiaries [member]]

+ References

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- Definition

The principal place of business of a subsidiary. [Refer: Principal place of business; Total for all subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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