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Other information about investments - Parent company (Details) - EUR (€)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Parent
Share capital	€ 4,005,000,000	€ 4,005,000,000
ENI SpA
Parent
Share capital	€ 4,005,358,876	€ 4,005,358,876
ENI SpA
Parent
Registered office	Rome
Country of operation	Italy
Share capital	€ 4,005,358,876
ENI SpA | Cassa Depositi ePrestiti SpA [Member]
Parent
Percentage of interest held in reporting entity	25.96%
ENI SpA | Ministero dell Economia e delle Finanze [Member]
Parent
Percentage of interest held in reporting entity	4.37%
ENI SpA | ENI SpA
Parent
Percentage of interest held in reporting entity	0.92%
ENI SpA | Other Shareholders [Member]
Parent
Percentage of interest held in reporting entity	68.75%

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