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Long-term debt and current portion of long-term debt (Details 2) - 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
Ordinary Bonds Issued [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Borrowings | € 17,965 | € 19,003
Borrowings, maturity | 2018–2043 |
Euro Medium Term Notes [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Nominal Amount | € 16,774 |
Discount on bond issue and accrued expenses | 189 |
Borrowings | 16,963 |
Other Bonds [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Nominal Amount | 1,000 |
Discount on bond issue and accrued expenses | 2 |
Borrowings | 1,002 |
Eni SpA [Member] | Euro Medium Term Notes One [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Nominal Amount | 1,500 |
Discount on bond issue and accrued expenses | 16 |
Borrowings | € 1,516 |
Borrowings, original currency | EUR |
Eni SpA [Member] | Euro Medium Term Notes One [Member] | Top Of Range [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Borrowings, maturity | 2019 |
Borrowings, interest rate | 4.125% |
Eni SpA [Member] | Euro Medium Term Notes Two [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Nominal Amount | € 1,200 |
Discount on bond issue and accrued expenses | 17 |
Borrowings | € 1,217 |
Borrowings, original currency | EUR |
Eni SpA [Member] | Euro Medium Term Notes Two [Member] | Top Of Range [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Borrowings, maturity | 2025 |
Borrowings, interest rate | 3.75% |
Eni SpA [Member] | Euro Medium Term Notes Three [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Nominal Amount | € 1,000 |
Discount on bond issue and accrued expenses | 37 |
Borrowings | € 1,037 |
Borrowings, original currency | EUR |
Eni SpA [Member] | Euro Medium Term Notes Three [Member] | Top Of Range [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Borrowings, maturity | 2020 |
Borrowings, interest rate | 4.25% |
Eni SpA [Member] | Euro Medium Term Notes Four [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Nominal Amount | € 1,000 |
Discount on bond issue and accrued expenses | 32 |
Borrowings | € 1,032 |
Borrowings, original currency | EUR |
Eni SpA [Member] | Euro Medium Term Notes Four [Member] | Top Of Range [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Borrowings, maturity | 2018 |
Borrowings, interest rate | 3.50% |
Eni SpA [Member] | Euro Medium Term Notes Five [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Nominal Amount | € 1,000 |
Discount on bond issue and accrued expenses | 27 |
Borrowings | € 1,027 |
Borrowings, original currency | EUR |
Eni SpA [Member] | Euro Medium Term Notes Five [Member] | Top Of Range [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Borrowings, maturity | 2029 |
Borrowings, interest rate | 3.625% |
Eni SpA [Member] | Euro Medium Term Notes Six [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Nominal Amount | € 1,000 |
Discount on bond issue and accrued expenses | 19 |
Borrowings | € 1,019 |
Borrowings, original currency | EUR |
Eni SpA [Member] | Euro Medium Term Notes Six [Member] | Top Of Range [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Borrowings, maturity | 2020 |
Borrowings, interest rate | 4.00% |
Eni SpA [Member] | Euro Medium Term Notes Seven [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Nominal Amount | € 1,000 |
Discount on bond issue and accrued expenses | 8 |
Borrowings | € 1,008 |
Borrowings, original currency | EUR |
Eni SpA [Member] | Euro Medium Term Notes Seven [Member] | Top Of Range [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Borrowings, maturity | 2023 |
Borrowings, interest rate | 3.25% |
Eni SpA [Member] | Euro Medium Term Notes Eight [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Nominal Amount | € 1,000 |
Discount on bond issue and accrued expenses | 7 |
Borrowings | € 1,007 |
Borrowings, original currency | EUR |
Eni SpA [Member] | Euro Medium Term Notes Eight [Member] | Top Of Range [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Borrowings, maturity | 2026 |
Borrowings, interest rate | 1.50% |
Eni SpA [Member] | Euro Medium Term Notes Nine [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Nominal Amount | € 900 |
Discount on bond issue and accrued expenses | (6) |
Borrowings | € 894 |
Borrowings, original currency | EUR |
Eni SpA [Member] | Euro Medium Term Notes Nine [Member] | Top Of Range [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Borrowings, maturity | 2024 |
Borrowings, interest rate | 0.625% |
Eni SpA [Member] | Euro Medium Term Notes Ten [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Nominal Amount | € 800 |
Discount on bond issue and accrued expenses | 1 |
Borrowings | € 801 |
Borrowings, original currency | EUR |
Eni SpA [Member] | Euro Medium Term Notes Ten [Member] | Top Of Range [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Borrowings, maturity | 2021 |
Borrowings, interest rate | 2.625% |
Eni SpA [Member] | Euro Medium Term Notes Eleven [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Nominal Amount | € 800 |
Discount on bond issue and accrued expenses | (2) |
Borrowings | € 798 |
Borrowings, original currency | EUR |
Eni SpA [Member] | Euro Medium Term Notes Eleven [Member] | Top Of Range [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Borrowings, maturity | 2028 |
Borrowings, interest rate | 1.625% |
Eni SpA [Member] | Euro Medium Term Notes Twevle [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Nominal Amount | € 750 |
Discount on bond issue and accrued expenses | 13 |
Borrowings | € 763 |
Borrowings, original currency | EUR |
Eni SpA [Member] | Euro Medium Term Notes Twevle [Member] | Top Of Range [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Borrowings, maturity | 2019 |
Borrowings, interest rate | 3.75% |
Eni SpA [Member] | Euro Medium Term Notes Thirteen [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Nominal Amount | € 750 |
Discount on bond issue and accrued expenses | 7 |
Borrowings | € 757 |
Borrowings, original currency | EUR |
Eni SpA [Member] | Euro Medium Term Notes Thirteen [Member] | Top Of Range [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Borrowings, maturity | 2024 |
Borrowings, interest rate | 1.75% |
Eni SpA [Member] | Euro Medium Term Notes Fourteen [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Nominal Amount | € 750 |
Discount on bond issue and accrued expenses | 4 |
Borrowings | € 754 |
Borrowings, original currency | EUR |
Eni SpA [Member] | Euro Medium Term Notes Fourteen [Member] | Top Of Range [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Borrowings, maturity | 2027 |
Borrowings, interest rate | 1.50% |
Eni SpA [Member] | Euro Medium Term Notes Fifteen [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Nominal Amount | € 700 |
Borrowings | € 700 |
Borrowings, original currency | EUR |
Eni SpA [Member] | Euro Medium Term Notes Fifteen [Member] | Top Of Range [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Borrowings, maturity | 2022 |
Borrowings, interest rate | 0.75% |
Eni SpA [Member] | Euro Medium Term Notes Sixteen [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Nominal Amount | € 650 |
Discount on bond issue and accrued expenses | (1) |
Borrowings | € 649 |
Borrowings, original currency | EUR |
Eni SpA [Member] | Euro Medium Term Notes Sixteen [Member] | Top Of Range [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Borrowings, maturity | 2025 |
Borrowings, interest rate | 1.00% |
Eni SpA [Member] | Other bonds One [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Nominal Amount | € 375 |
Discount on bond issue and accrued expenses | 3 |
Borrowings | € 378 |
Borrowings, original currency | USD |
Eni SpA [Member] | Other bonds One [Member] | Top Of Range [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Borrowings, maturity | 2020 |
Borrowings, interest rate | 4.15% |
Eni SpA [Member] | Other bonds Two [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Nominal Amount | € 292 |
Borrowings | € 292 |
Borrowings, original currency | USD |
Eni SpA [Member] | Other bonds Two [Member] | Top Of Range [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Borrowings, maturity | 2040 |
Borrowings, interest rate | 5.70% |
Eni SpA [Member] | Euro Medium Term Notes Seventeen [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Nominal Amount | € 600 |
Discount on bond issue and accrued expenses | (6) |
Borrowings | € 594 |
Borrowings, original currency | EUR |
Eni SpA [Member] | Euro Medium Term Notes Seventeen [Member] | Top Of Range [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Borrowings, maturity | 2028 |
Borrowings, interest rate | 1.125% |
Eni Finance International SA [Member] | Euro Medium Term Notes Eighteen [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Nominal Amount | € 507 |
Discount on bond issue and accrued expenses | 15 |
Borrowings | € 522 |
Borrowings, original currency | GBP |
Eni Finance International SA [Member] | Euro Medium Term Notes Eighteen [Member] | Top Of Range [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Borrowings, maturity | 2021 |
Borrowings, interest rate | 6.125% |
Eni Finance International SA [Member] | Euro Medium Term Notes Eighteen [Member] | Bottom Of Range [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Borrowings, maturity | 2018 |
Borrowings, interest rate | 4.75% |
Eni Finance International SA [Member] | Euro Medium Term Notes Nineteen [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Nominal Amount | € 295 |
Discount on bond issue and accrued expenses | 3 |
Borrowings | € 298 |
Borrowings, original currency | EUR |
Eni Finance International SA [Member] | Euro Medium Term Notes Nineteen [Member] | Top Of Range [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Borrowings, maturity | 2043 |
Borrowings, interest rate | 5.441% |
Eni Finance International SA [Member] | Euro Medium Term Notes Nineteen [Member] | Bottom Of Range [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Borrowings, maturity | 2028 |
Borrowings, interest rate | 3.875% |
Eni Finance International SA [Member] | Euro Medium Term Notes Twenty [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Nominal Amount | € 155 |
Discount on bond issue and accrued expenses | 1 |
Borrowings | € 156 |
Borrowings, original currency | YEN |
Eni Finance International SA [Member] | Euro Medium Term Notes Twenty [Member] | Top Of Range [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Borrowings, maturity | 2037 |
Borrowings, interest rate | 2.81% |
Eni Finance International SA [Member] | Euro Medium Term Notes Twenty [Member] | Bottom Of Range [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Borrowings, maturity | 2019 |
Borrowings, interest rate | 1.955% |
Eni Finance International SA [Member] | Euro Medium Term Notes Twenty One [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Nominal Amount | € 417 |
Discount on bond issue and accrued expenses | (3) |
Borrowings | € 414 |
Borrowings, original currency | USD |
Eni Finance International SA [Member] | Euro Medium Term Notes Twenty One [Member] | Top Of Range [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Borrowings, maturity | 2026 |
Eni USA Inc [Member] | Other bonds Three [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Nominal Amount | € 333 |
Discount on bond issue and accrued expenses | (1) |
Borrowings | € 332 |
Borrowings, original currency | USD |
Eni USA Inc [Member] | Other bonds Three [Member] | Top Of Range [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Borrowings, maturity | 2027 |
Borrowings, interest rate | 7.30% |

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