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Equity - Reconciliation of net profit and shareholders' equity of parent company (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
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 € (10,660) € (2,800)    
- difference between purchase cost and underlying carrying amounts of net equity, Net profit (6) (6)    
- adjustments to comply with Group accounting policies, Net profit 264 (348)    
- elimination of unrealized intercompany profits, Net profit 88 (74)    
- deferred taxation, Net profit 79 405    
Profit (loss) (8,628) 155 € 4,137  
Non-controlling interest, Net profit (7) (7) (11)  
Profit (loss), attributable to owners of parent (8,635) 148 4,126  
Excess of net equity stated in the separate accounts of consolidated subsidiaries over the corresponding carrying amounts of the parent company, Shareholders' equity (8,839) 5,211    
- difference between purchase cost and underlying carrying amounts of net equity, Shareholders' equity 193 202    
- adjustments to comply with Group accounting policies, Shareholders' equity 2,086 1,424    
- elimination of unrealized intercompany profits, Shareholders' equity (478) (593)    
- deferred taxation, Shareholders' equity (176) 20    
Equity. 37,493 47,900 € 51,073 € 48,079
Non-controlling interest (78) (61)    
As recorded in Consolidated Financial Statements, Shareholders' equity 37,415 47,839    
Eni SpA's Financial Statements        
Separate to consolidated reconciliation        
Profit (loss) 1,607 2,978    
Equity. € 44,707 € 41,636