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Finance debt - Convertible senior unsecured sustainability-linked bonds (Details) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Borrowings
Borrowings	€ 28,729	€ 26,917
Convertible senior unsecured sustainability-linked bond
Borrowings
Nominal value	1,000
ENI SpA | of which financial liabilities
Borrowings
Nominal value	920
Discount on bond issue and accrued expenses	6
Borrowings	€ 926
Borrowings, original currency	EUR
ENI SpA | of which equity
Borrowings
Nominal value	€ 80
Discount on bond issue and accrued expenses	(1)
Borrowings	€ 79
Borrowings, original currency	EUR
ENI SpA | Convertible senior unsecured sustainability-linked bond
Borrowings
Nominal value	€ 1,000
Discount on bond issue and accrued expenses	5
Borrowings	€ 1,005
Borrowings, original currency	EUR
Borrowings, maturity	2030
Borrowings, interest rate	2.95%

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