v3.26.1
Finance debts - Additional information (Details 1) - EUR (€)
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Borrowings    
Changes in the scope of consolidation € 474,000,000 € 917,000,000
Lease liabilities assumptions 1,150,000,000 € 2,109,000,000
Trade payables on which payment term extensions have been negotiated € 1,442,000,000  
Minimum    
Borrowings    
Discount rates used to measure fair value of financial debt 1.90% 1.70%
Maximum    
Borrowings    
Discount rates used to measure fair value of financial debt 4.80% 4.80%
Eni CCUS Holding    
Borrowings    
Changes in the scope of consolidation € (298,000,000)  
Plen. Prod. France SAS    
Borrowings    
Changes in the scope of consolidation 762,000,000  
Decrease through reclassification to assets held for sale 762,000,000  
Committed borrowing facilities    
Borrowings    
Borrowing facilities 9,012,000,000 € 9,001,000,000
Undrawn borrowing facilities 9,000,000,000  
Convertible senior unsecured sustainability-linked bond    
Borrowings    
Nominal value € 1,000,000,000  
Bond expiry 7 years  
Bond conversion price 17.5513