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Other information about investments - Parent company (Details) - EUR (€) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
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 | 25.76% |
ENI SpA | Ministero dell Economia e delle Finanze [Member] |  |
Parent |  |
Percentage of interest held in reporting entity | 4.34% |
ENI SpA | ENI SpA |  |
Parent |  |
Percentage of interest held in reporting entity | 1.70% |
ENI SpA | Other Shareholders [Member] |  |
Parent |  |
Percentage of interest held in reporting entity | 68.20% |

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