v3.26.1
Other information about investments - Subsidiaries - Refining and Chemicals (Details)
12 Months Ended
Dec. 31, 2025
Refining Segment [Member] | Italy | Subsidiaries One [Member]  
Subsidiaries  
Company name Ecofuel SpA
Registered office San Donato Milanese (MI)
Country of operation Italy
% Equity ratio 100.00%
Refining Segment [Member] | Italy | Subsidiaries One [Member] | ENI SpA  
Subsidiaries  
% Ownership 100.00%
Refining Segment [Member] | Foreign (outside Italy) | Subsidiaries Two [Member]  
Subsidiaries  
Company name Eni Abu Dhabi Refining & Trading BV
Registered office Amsterdam (Netherlands)
Country of operation Netherlands
% Equity ratio 100.00%
Refining Segment [Member] | Foreign (outside Italy) | Subsidiaries Two [Member] | Eni International BV  
Subsidiaries  
% Ownership 100.00%
Chemicals | Italy | Subsidiaries One [Member]  
Subsidiaries  
Company name Versalis SpA
Registered office San Donato Milanese (MI)
Country of operation Italy
% Equity ratio 100.00%
Chemicals | Italy | Subsidiaries One [Member] | ENI SpA  
Subsidiaries  
% Ownership 100.00%
Chemicals | Italy | Subsidiaries Two [Member]  
Subsidiaries  
Company name Finproject SpA
Registered office Morrovalle (MC)
Country of operation Italy
% Equity ratio 100.00%
Chemicals | Italy | Subsidiaries Two [Member] | Versalis SpA  
Subsidiaries  
% Ownership 100.00%
Chemicals | Italy | Subsidiaries Three [Member]  
Subsidiaries  
Company name Novamont SpA
Registered office Novara
Country of operation Italy
% Equity ratio 100.00%
Chemicals | Italy | Subsidiaries Three [Member] | Versalis SpA  
Subsidiaries  
% Ownership 100.00%
Chemicals | Italy | Subsidiaries Four [Member]  
Subsidiaries  
Company name Versalis Oilfield Solutions Srl (former Rewave Srl)
Registered office San Donato Milanese (MI)
Country of operation Italy
% Equity ratio 100.00%
Chemicals | Italy | Subsidiaries Four [Member] | Versalis SpA  
Subsidiaries  
% Ownership 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Five [Member]  
Subsidiaries  
Company name BioBag Americas Inc
Registered office Dunedin (USA)
Country of operation USA
% Equity ratio 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Five [Member] | BioBag International  
Subsidiaries  
% Ownership 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Six [Member]  
Subsidiaries  
Company name BioBag International AS
Registered office Indre Østfold (Norway)
Country of operation Norway
% Equity ratio 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Six [Member] | Novamont SpA  
Subsidiaries  
% Ownership 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Seven [Member]  
Subsidiaries  
Company name Dagöplast AS
Registered office Hiiumaa (Estonia)
Country of operation Estonia
% Equity ratio 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Seven [Member] | BioBag International  
Subsidiaries  
% Ownership 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Eight [Member]  
Subsidiaries  
Company name Dunastyr Polisztirolgyártó Zártkörûen Mûködõ Részvénytársaság
Registered office Budapest (Hungary)
Country of operation Hungary
% Equity ratio 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Eight [Member] | Versalis SpA  
Subsidiaries  
% Ownership 96.34%
Chemicals | Foreign (outside Italy) | Subsidiaries Eight [Member] | Versalis Deutsch GmbH  
Subsidiaries  
% Ownership 1.83%
Chemicals | Foreign (outside Italy) | Subsidiaries Eight [Member] | Versalis International SA  
Subsidiaries  
% Ownership 1.83%
Chemicals | Foreign (outside Italy) | Subsidiaries Nine [Member]  
Subsidiaries  
Company name Finproject India Pvt Ltd
Registered office Jaipur (India)
Country of operation India
% Equity ratio 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Nine [Member] | Versalis Asia Pacific Pte Ltd [Member]  
Subsidiaries  
% Ownership 99.99%
Chemicals | Foreign (outside Italy) | Subsidiaries Ten [Member]  
Subsidiaries  
Company name Finproject Romania Srl
Registered office Valea Lui Mihai (Romania)
Country of operation Romania
% Equity ratio 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Ten [Member] | Finproject SpA  
Subsidiaries  
% Ownership 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Eleven [Member]  
Subsidiaries  
Company name Foam Creations (2008) Inc
Registered office Quebec City (Canada)
Country of operation Canada
% Equity ratio 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Eleven [Member] | Finproject SpA  
Subsidiaries  
% Ownership 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Twelve [Member]  
Subsidiaries  
Company name Foam Creations México SA de CV
Registered office León (Mexico)
Country of operation Mexico
% Equity ratio 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Twelve [Member] | Finproject SpA  
Subsidiaries  
% Ownership 46.77%
Chemicals | Foreign (outside Italy) | Subsidiaries Twelve [Member] | Foam Creations (2008)  
Subsidiaries  
% Ownership 53.23%
Chemicals | Foreign (outside Italy) | Subsidiaries Thirteen [Member]  
Subsidiaries  
Company name Novamont France SAS
Registered office Paris (France)
Country of operation France
% Equity ratio 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Thirteen [Member] | Novamont SpA  
Subsidiaries  
% Ownership 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Fourteen [Member]  
Subsidiaries  
Company name Novamont Iberia SLU
Registered office Cornellà de Llobregat (Spain)
Country of operation Spain
% Equity ratio 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Fourteen [Member] | Novamont SpA  
Subsidiaries  
% Ownership 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Fifteen [Member]  
Subsidiaries  
Company name Novamont North America Inc
Registered office Shelton (USA)
Country of operation USA
% Equity ratio 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Fifteen [Member] | Novamont SpA  
Subsidiaries  
% Ownership 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Sixteen [Member]  
Subsidiaries  
Company name Versalis Americas Inc
Registered office Dover (USA)
Country of operation USA
% Equity ratio 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Sixteen [Member] | Eni Petroleum Co Inc  
Subsidiaries  
% Ownership 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Seventeen [Member]  
Subsidiaries  
Company name Versalis Asia Pacific Pte Ltd
Registered office Singapore (Singapore)
Country of operation Singapore
% Equity ratio 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Seventeen [Member] | Versalis SpA  
Subsidiaries  
% Ownership 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Eighteen [Member]  
Subsidiaries  
Company name Versalis Congo Sarlu
Registered office Pointe-Noire (Republic of the Congo)
Country of operation Republic of the Congo
% Equity ratio 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Eighteen [Member] | Versalis Oilfield S. Srl  
Subsidiaries  
% Ownership 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Nineteen [Member]  
Subsidiaries  
Company name Versalis Deutschland GmbH
Registered office Eschborn (Germany)
Country of operation Germany
% Equity ratio 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Nineteen [Member] | Versalis SpA  
Subsidiaries  
% Ownership 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Twenty [Member]  
Subsidiaries  
Company name Versalis France SAS
Registered office Mardyck (France)
Country of operation France
% Equity ratio 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Twenty [Member] | Versalis SpA  
Subsidiaries  
% Ownership 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Twenty One [Member]  
Subsidiaries  
Company name Versalis International Côte d'Ivoire Sarlu
Registered office Abidjan (Ivory Coast)
Country of operation Ivory Coast
% Equity ratio 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Twenty One [Member] | Versalis Oilfield S. Srl  
Subsidiaries  
% Ownership 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Twenty Two [Member]  
Subsidiaries  
Company name Versalis International SA
Registered office Bruxelles (Belgium)
Country of operation Belgium
% Equity ratio 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Twenty Two [Member] | Versalis SpA  
Subsidiaries  
% Ownership 59.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Twenty Two [Member] | Versalis Deutsch GmbH  
Subsidiaries  
% Ownership 23.71%
Chemicals | Foreign (outside Italy) | Subsidiaries Twenty Two [Member] | Dunastyr Zrt  
Subsidiaries  
% Ownership 14.43%
Chemicals | Foreign (outside Italy) | Subsidiaries Twenty Two [Member] | Versalis France  
Subsidiaries  
% Ownership 2.86%
Chemicals | Foreign (outside Italy) | Subsidiaries Twenty Three [Member]  
Subsidiaries  
Company name Versalis Kimya Ticaret Limited Sirketi
Registered office Istanbul (Turkey)
Country of operation Turkey
% Equity ratio 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Twenty Three [Member] | Versalis International SA  
Subsidiaries  
% Ownership 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Twenty Four [Member]  
Subsidiaries  
Company name Versalis México S. de RL de CV
Registered office Mexico City (Mexico)
Country of operation Mexico
% Equity ratio 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Twenty Four [Member] | Versalis Oilfield S. Srl  
Subsidiaries  
% Ownership 99.99%
Chemicals | Foreign (outside Italy) | Subsidiaries Twenty Five [Member]  
Subsidiaries  
Company name Versalis Pacific Trading (Shanghai) Co Ltd
Registered office Shanghai (China)
Country of operation China
% Equity ratio 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Twenty Five [Member] | Versalis Asia Pacific Pte Ltd [Member]  
Subsidiaries  
% Ownership 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Twenty Six [Member]  
Subsidiaries  
Company name Versalis UK Ltd
Registered office London (United Kingdom)
Country of operation United Kingdom
% Equity ratio 100.00%
Chemicals | Foreign (outside Italy) | Subsidiaries Twenty Six [Member] | Versalis SpA  
Subsidiaries  
% Ownership 100.00%