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Long-term debt and current portion of long-term debt (Details 3) - EUR (€) € in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Discount on bond issue and accrued expenses | € 191 |
Borrowings | 24,707 | € 27,239
Convertible bonds issued {Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Nominal Amount | 400 |
Discount on bond issue and accrued expenses | (13) |
Borrowings | € 387 |
Borrowings, maturity | 2022 |
Convertible bonds issued {Member] | Eni SpA [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Nominal Amount | € 400 |
Discount on bond issue and accrued expenses | (13) |
Borrowings | € 387 |
Borrowings, original currency | EUR |
Borrowings, maturity | 2022 |
Borrowings, interest rate | 0.00% |

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