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Finance debt - Sustainability linked bonds (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 01, 2021
Borrowings      
Borrowings € 26,917 € 27,794 € 27,794
Sustainability-linked bond      
Borrowings      
Nominal value 1,000    
Borrowings 998 € 998  
ENI SpA | Sustainability-linked bond      
Borrowings      
Nominal value 1,000    
Discount on bond issue and accrued expenses (2)    
Borrowings € 998    
Borrowings, original currency EUR    
Borrowings, maturity 2028    
Borrowings, interest rate 0.375%