v3.26.1
Other information about investments - Subsidiaries - Corporate and other activities (Details)
12 Months Ended
Dec. 31, 2025
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 EniBioCh4in Aprilia Srl
Registered office San Donato Milanese (MI)
Country of operation Italy
% Equity ratio 85.00%
Corporate and financial companies | Italy | Subsidiaries Three [Member] | EniBioCh4in SpA  
Subsidiaries  
% Ownership 100.00%
Corporate and financial companies | Italy | Subsidiaries Four [Member]  
Subsidiaries  
Company name EniBioCh4in Grupellum Società Agricola Srl
Registered office San Donato Milanese (MI)
Country of operation Italy
% Equity ratio 83.30%
Corporate and financial companies | Italy | Subsidiaries Four [Member] | EniBioCh4in SpA  
Subsidiaries  
% Ownership 98.00%
Corporate and financial companies | Italy | Subsidiaries Four [Member] | Third parties  
Subsidiaries  
% Ownership 2.00%
Corporate and financial companies | Italy | Subsidiaries Five [Member]  
Subsidiaries  
Company name EniBioCh4in Jonica Srl
Registered office San Donato Milanese (MI)
Country of operation Italy
% Equity ratio 85.00%
Corporate and financial companies | Italy | Subsidiaries Five [Member] | EniBioCh4in SpA  
Subsidiaries  
% Ownership 100.00%
Corporate and financial companies | Italy | Subsidiaries Six [Member]  
Subsidiaries  
Company name EniBioCh4in Pannellia BioGas Srl Società Agricola
Registered office San Donato Milanese (MI)
Country of operation Italy
% Equity ratio 85.00%
Corporate and financial companies | Italy | Subsidiaries Six [Member] | EniBioCh4in SpA  
Subsidiaries  
% Ownership 100.00%
Corporate and financial companies | Italy | Subsidiaries Seven [Member]  
Subsidiaries  
Company name EniBioCh4in Po Energia Srl Società Agricola
Registered office San Donato Milanese (MI)
Country of operation Italy
% Equity ratio 85.00%
Corporate and financial companies | Italy | Subsidiaries Seven [Member] | EniBioCh4in SpA  
Subsidiaries  
% Ownership 100.00%
Corporate and financial companies | Italy | Subsidiaries Eight [Member]  
Subsidiaries  
Company name EniBioCh4in Quadruvium Srl Società Agricola
Registered office San Donato Milanese (MI)
Country of operation Italy
% Equity ratio 85.00%
Corporate and financial companies | Italy | Subsidiaries Eight [Member] | EniBioCh4in SpA  
Subsidiaries  
% Ownership 100.00%
Corporate and financial companies | Italy | Subsidiaries Nine [Member]  
Subsidiaries  
Company name EniBioCh4in SpA
Registered office San Donato Milanese (MI)
Country of operation Italy
% Equity ratio 85.00%
Corporate and financial companies | Italy | Subsidiaries Nine [Member] | ENI SpA  
Subsidiaries  
% Ownership 50.00%
Corporate and financial companies | Italy | Subsidiaries Nine [Member] | Enilive SpA  
Subsidiaries  
% Ownership 50.00%
Corporate and financial companies | Italy | Subsidiaries Ten [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 Ten [Member] | ENI SpA  
Subsidiaries  
% Ownership 100.00%
Corporate and financial companies | Italy | Subsidiaries Eleven [Member]  
Subsidiaries  
Company name Eni Insurance SpA
Registered office Rome
Country of operation Italy
% Equity ratio 100.00%
Corporate and financial companies | Italy | Subsidiaries Eleven [Member] | ENI SpA  
Subsidiaries  
% Ownership 100.00%
Corporate and financial companies | Italy | Subsidiaries Twelve [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 Twelve [Member] | ENI SpA  
Subsidiaries  
% Ownership 100.00%
Corporate and financial companies | Italy | Subsidiaries Thirteen [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 Thirteen [Member] | ENI SpA  
Subsidiaries  
% Ownership 100.00%
Corporate and financial companies | Italy | Subsidiaries Fourteen [Member]  
Subsidiaries  
Company name Enivibes Srl
Registered office Vimodrone (MI)
Country of operation Italy
% Equity ratio 76.00%
Corporate and financial companies | Italy | Subsidiaries Fourteen [Member] | Eniverse  
Subsidiaries  
% Ownership 76.00%
Corporate and financial companies | Italy | Subsidiaries Fourteen [Member] | Third parties  
Subsidiaries  
% Ownership 24.00%
Corporate and financial companies | Italy | Subsidiaries Fifteen [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 Fifteen [Member] | ENI SpA  
Subsidiaries  
% Ownership 100.00%
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Sixteen [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 Sixteen [Member] | Eni International BV  
Subsidiaries  
% Ownership 99.90%
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Sixteen [Member] | Eni Oil Holdings BV  
Subsidiaries  
% Ownership 0.10%
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Seventeen [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 Seventeen [Member] | ENI SpA  
Subsidiaries  
% Ownership 100.00%
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Eighteen [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 Eighteen [Member] | ENI SpA  
Subsidiaries  
% Ownership 99.99%
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Nineteen [Member]  
Subsidiaries  
Company name Eni Netherlands Holding BV
Registered office Amsterdam (Netherlands)
Country of operation Netherlands
% Equity ratio 100.00%
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Nineteen [Member] | Eni International BV  
Subsidiaries  
% Ownership 100.00%
Corporate and financial companies | Foreign (outside Italy) | Subsidiaries Twenty [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 Twenty [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 SpA  
Subsidiaries  
% Ownership 99.99%