v3.26.1
Guarantees, commitments and risks - Additional information (Details)
€ in Millions, t in Millions
12 Months Ended
Dec. 31, 2025
EUR (€)
t
Dec. 31, 2024
EUR (€)
Jun. 24, 2025
EUR (€)
Dec. 31, 2023
EUR (€)
Nov. 30, 2023
EUR (€)
May 09, 2023
Guarantees, commitments and risks            
Capital commitments € 20,188          
Increase (decrease) in capital commitments (7,061)          
Risks 856 € 1,046        
Lease liabilities € 5,700 6,453   € 5,336    
Period over which the management deems the liquidity reserves retained are enough to meet the financial obligations 18 months          
Offsetting of other financial assets and liabilities € 13          
Increase (decrease) in guarantees (851)          
Increase (decrease) in financial guarantees € (1,102)          
Quantity of total emission of carbon dioxide | t 16.4          
Quantity of free emission allowance of carbon dioxide | t 5.1          
Deficit quantity of emission allowance of carbon dioxide | t 11.3          
Spain, United States and Italy renewable energy project            
Guarantees, commitments and risks            
Capital commitments € 560 246        
Alleged illegal handling of waste material            
Guarantees, commitments and risks            
Fine payable 700,000          
Contextual confiscation amount 44,248,071          
Derivatives            
Guarantees, commitments and risks            
Gross amount of financial assets and liabilities subject to offsetting 1,133 1,508        
Eni RAK BV            
Guarantees, commitments and risks            
Decrease through exchange rate differences and termination of parent company guarantees issued to bank 1,924          
Eni Abu Dhabi Refining & Trading BV            
Guarantees, commitments and risks            
Capital commitments € 3,402 3,849        
Eni Abu Dhabi Refining & Trading BV | ADNOC Refining            
Guarantees, commitments and risks            
Equity interest acquired (as a percent) 20.00%          
Agip Karachaganak BV | The Republic of Kazakhstan (“Rok”) | Civil and administrative proceedings in the matters of environment, health and safety            
Guarantees, commitments and risks            
Percentage of interest in project 29.25%          
Agip Caspian Sea BV | The Republic of Kazakhstan (“Rok”) | Civil and administrative proceedings in the matters of environment, health and safety            
Guarantees, commitments and risks            
Percentage of interest in project 16.67%          
Exploration & Production            
Guarantees, commitments and risks            
Gross amount of financial assets and liabilities subject to offsetting € 4,581 4,429        
Committed borrowing facilities            
Guarantees, commitments and risks            
Committed borrowing facilities 9,012 9,001        
Undrawn borrowing facilities 9,000          
Euro Medium Term Notes            
Guarantees, commitments and risks            
Maximum amount issuable 20,000          
Notional amount 12,800          
Sustainability-linked credit facilities [member] | Committed borrowing facilities            
Guarantees, commitments and risks            
Undrawn borrowing facilities 9,000          
Risk associated with contractual assurances to acquirers            
Guarantees, commitments and risks            
Risks 236 264        
Value of assets of third parties under custody            
Guarantees, commitments and risks            
Risks € 610 772        
Currency            
Guarantees, commitments and risks            
Percentage of confidence level 99.00%          
Holding period 11 days          
Interest rate risk            
Guarantees, commitments and risks            
Percentage of confidence level 99.00%          
Holding period 1 day          
Commodity price risk            
Guarantees, commitments and risks            
Percentage of confidence level 95.00%          
Holding period 11 days          
Strategic liquidity risk            
Guarantees, commitments and risks            
Percentage of confidence level 99.00%          
Holding period 1 day          
Period of medium and long-term financial debts for which coverage must be provided 24 months          
Hydrocarbon exploration and production activities            
Guarantees, commitments and risks            
Capital commitments € 72,797 € 79,858        
Cardon IV SA            
Guarantees, commitments and risks            
Proportion of ownership interest in joint venture 50.00%          
Proportion of voting rights held in joint venture 50.00%          
Azule Energy Holdings Ltd            
Guarantees, commitments and risks            
Proportion of ownership interest in joint venture 50.00%          
Proportion of voting rights held in joint venture 50.00% 50.00%        
State oil Company of Mozambique ENH            
Guarantees, commitments and risks            
Decrease through termination of guarantees issued to bank € (1,710)          
CCUS activities in the United Kingdom and the Netherlands            
Guarantees, commitments and risks            
Percentage of ownership interest divested (as a percent) 49.99%          
Increase through issuance of guarantees in connection with the sale of joint control operations € 1,218          
Partners of unincorporated joint operations            
Guarantees, commitments and risks            
Lease liabilities 1,082 € 925        
Greenpeace Onlus and ReCommon APS, together with 12 private citizens | Climate dispute            
Guarantees, commitments and risks            
Percentage of emissions to be reduced by 2030 compared to 2020 levels           45.00%
Pastor and the associations | NAOC Ltd | Alleged damages deriving from artefacts            
Guarantees, commitments and risks            
Estimated damage value         € 48  
Novamont SpA | ENI SpA | Civil and administrative proceedings in the matters of environment, health and safety            
Guarantees, commitments and risks            
Administrative fine imposed for alleged abuses of dominant position in the relevant markets     € 32      
Administrative fine imposed jointly and severally     € 2      
Consolidated subsidiaries            
Guarantees, commitments and risks            
Underlying commitment € 5,223 € 5,790