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Other information about investments (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 EUR (€) | Dec. 31, 2017 EUR (€)
Disclosure of subsidiaries [line items] |  |  |
Share capital |  | € 4,005,000,000 | € 4,005,000,000
Parent [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Share capital |  | € 4,005,358,876 |
Parent [Member] | Cassa Depositi ePrestiti SpA [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of parent entity | [1] | Eni SpA(#) |
Registered office |  | Rome |
Principal place of business |  | Italy |
Name of Shareholders |  | Cassa Depositi e Prestiti SpA |
Equity Method Investments, Ownership Percentage |  | 25.76 |
Parent [Member] | Ministero dell Economia e delle Finanze [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of Shareholders |  | Ministero dell’Economia e delle Finanze |
Equity Method Investments, Ownership Percentage |  | 4.34 |
Parent [Member] | ENI SPA [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of Shareholders |  | Eni SpA |
Equity Method Investments, Ownership Percentage |  | 0.91 |
Parent [Member] | Other Shareholders [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Name of Shareholders |  | Other shareholders |
Equity Method Investments, Ownership Percentage |  | 68.99 |
[1] | Company with shares quoted in the regulated market of Italy or of other EU countries

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