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Equity - Reconciliation of net profit and shareholders' equity of parent company (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
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 € 3,202 € 7,375    
- adjustments to comply with Group accounting policies, Net profit (2,266) 797    
- elimination of unrealized intercompany profits, Net profit 86 124    
- deferred taxation, Net profit 566 262    
Profit (loss) 4,860 13,961 € 5,840  
Non-controlling interest, Net profit (89) (74) (19)  
Profit (loss), attributable to owners of parent 4,771 13,887 5,821  
Excess of net equity stated in the separate accounts of consolidated subsidiaries over the corresponding carrying amounts of the parent company, Shareholders' equity (814) (1,302)    
- difference between purchase cost and underlying carrying amounts of net equity, Shareholders' equity 153 153    
- adjustments to comply with Group accounting policies, Shareholders' equity 3,774 4,468    
- elimination of unrealized intercompany profits, Shareholders' equity (437) (533)    
- deferred taxation, Shareholders' equity (51) (76)    
Equity. 53,644 55,230 € 44,519 € 37,493
Non-controlling interest (460) (471)    
As recorded in Consolidated Financial Statements, Shareholders' equity 53,184 54,759    
Eni SpA's Financial Statements        
Separate to consolidated reconciliation        
Profit (loss) 3,272 5,403    
Equity. € 51,019 € 52,520