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Finance debts - Convertible bonds (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Borrowings    
Borrowings € 26,686 € 24,518
Convertible Bonds    
Borrowings    
Borrowings 396 € 393
ENI SpA | Convertible Bonds    
Borrowings    
Nominal value 400  
Discount on bond issue and accrued expenses (4)  
Borrowings € 396  
Borrowings, original currency EUR  
Borrowings, maturity 2022  
Borrowings, interest rate 0.00%