v3.26.1
Equity - Reconciliation of net profit and shareholders' equity of parent company (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Separate to consolidated reconciliation        
Excess of net equity stated in the separate accounts of consolidated subsidiaries over the corresponding carrying amounts of the parent company, Net profit € (1,643) € (2,029)    
- adjustments to comply with Group accounting policies, Net profit (285) (1,722)    
- elimination of unrealized intercompany profits, Net profit 219 (80)    
- deferred taxation, Net profit 38 176    
Profit (loss) 2,758 2,764 € 4,860  
Non-controlling interest, Net profit (150) (140) (89)  
Profit (loss), attributable to owners of parent 2,608 2,624 4,771  
Excess of net equity stated in the separate accounts of consolidated subsidiaries over the corresponding carrying amounts of the parent company, Shareholders' equity 1,643 4,338    
- difference between purchase cost and underlying carrying amounts of net equity, Shareholders' equity 153 153    
- adjustments to comply with Group accounting policies, Shareholders' equity 425 1,240    
- elimination of unrealized intercompany profits, Shareholders' equity (301) (537)    
- deferred taxation, Shareholders' equity (119) (281)    
Equity. 52,787 55,648 € 53,644 € 55,230
Non-controlling interest (4,847) (2,863)    
As recorded in Consolidated Financial Statements, Shareholders' equity 47,940 52,785    
Eni SpA's Financial Statements        
Separate to consolidated reconciliation        
Profit (loss) 4,429 6,419    
Equity. € 50,986 € 50,735