v3.26.1
Investments (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Investments    
Book amount - beginning of the year € 14,150 € 12,630
Additions and subscriptions 595 727
Divestments and reimbursements (104) (326)
Share of profit of equity-accounted investments 1,414 1,202
Share of loss of equity-accounted investments (252) (316)
Deduction for dividends (1,512) (1,752)
Changes in the scope of consolidation 125 650
Currency translation differences (1,419) 667
Other changes 158 668
Book amount - end of the year 13,155 14,150
Investments in unconsolidated entities controlled by Eni    
Investments    
Book amount - beginning of the year 82 53
Additions and subscriptions 21 35
Divestments and reimbursements   (2)
Share of profit of equity-accounted investments 4 5
Share of loss of equity-accounted investments (9) (12)
Deduction for dividends (1) (3)
Changes in the scope of consolidation (13) 8
Currency translation differences (1)  
Other changes 9 (2)
Book amount - end of the year 92 82
Joint ventures    
Investments    
Book amount - beginning of the year 9,449 8,250
Additions and subscriptions 399 450
Divestments and reimbursements (84) (291)
Share of profit of equity-accounted investments 664 795
Share of loss of equity-accounted investments (102) (123)
Deduction for dividends (573) (655)
Changes in the scope of consolidation 138 635
Currency translation differences (940) 461
Other changes 65 (73)
Book amount - end of the year 9,016 9,449
Associates    
Investments    
Book amount - beginning of the year 4,619 4,327
Additions and subscriptions 175 242
Divestments and reimbursements (20) (33)
Share of profit of equity-accounted investments 746 402
Share of loss of equity-accounted investments (141) (181)
Deduction for dividends (938) (1,094)
Changes in the scope of consolidation   7
Currency translation differences (478) 206
Other changes 84 743
Book amount - end of the year € 4,047 € 4,619