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Equity - Reconciliation of net profit and shareholders' equity of parent company (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
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 € 7,375 € (3,324)    
- adjustments to comply with Group accounting policies, Net profit 797 1,855    
- elimination of unrealized intercompany profits, Net profit 124 (176)    
- deferred taxation, Net profit 262 (190)    
Profit (loss) 13,961 5,840 € (8,628)  
Non-controlling interest, Net profit (74) (19) (7)  
Profit (loss), attributable to owners of parent 13,887 5,821 (8,635)  
Excess of net equity stated in the separate accounts of consolidated subsidiaries over the corresponding carrying amounts of the parent company, Shareholders' equity (1,302) (9,910)    
- difference between purchase cost and underlying carrying amounts of net equity, Shareholders' equity 153 153    
- adjustments to comply with Group accounting policies, Shareholders' equity 4,468 4,266    
- elimination of unrealized intercompany profits, Shareholders' equity (533) (654)    
- deferred taxation, Shareholders' equity (76) (375)    
Equity. 55,230 44,519 € 37,493 € 47,900
Non-controlling interest (471) (82)    
As recorded in Consolidated Financial Statements, Shareholders' equity 54,759 44,437    
Eni SpA's Financial Statements        
Separate to consolidated reconciliation        
Profit (loss) 5,403 7,675    
Equity. € 52,520 € 51,039