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Other information about investments (Details Textual) - EUR (€) € in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of subsidiaries [line items] |  |
Non-controlling interest | € 49 | € 49
Corporate and other activities [Member] | Eni SpA [Member] |  |
Disclosure of subsidiaries [line items] |  |
Proportion of ownership interest in other significant investments | 10.08% |
Corporate and other activities [Member] | Other Related Parties [Member] |  |
Disclosure of subsidiaries [line items] |  |
Proportion of ownership interest in other significant investments | 89.92% |
Other activities [Member] | Eni SpA [Member] |  |
Disclosure of subsidiaries [line items] |  |
Proportion Of Ownership Interest In Joint Arrangements And Associates | 31.00% |
Other activities [Member] | Other Related Parties [Member] |  |
Disclosure of subsidiaries [line items] |  |
Proportion Of Ownership Interest In Joint Arrangements And Associates | 52.00% |
Other activities [Member] | Syndial SpA [Member] |  |
Disclosure of subsidiaries [line items] |  |
Proportion Of Ownership Interest In Joint Arrangements And Associates | 48.00% |
Other activities [Member] | Other Related Parties One [Member] |  |
Disclosure of subsidiaries [line items] |  |
Proportion Of Ownership Interest In Joint Arrangements And Associates | 69.00% |
Refining & Marketing [Member] | Other Related Parties [Member] |  |
Disclosure of subsidiaries [line items] |  |
Proportion Of Ownership Interest In Joint Arrangements And Associates | 50.00% |
Refining & Marketing [Member] | Ecofuel SpA [Member] |  |
Disclosure of subsidiaries [line items] |  |
Proportion Of Ownership Interest In Joint Arrangements And Associates | 50.00% |

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