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Financial liabilities (Details 2) € in Millions, ¥ in Millions, £ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 EUR (€) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 GBP (£) | Dec. 31, 2018 JPY (¥) | Dec. 31, 2017 EUR (€)
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Discount on bond issue and accrued expenses | $ |  | $ 179 |  |  |
Borrowings | € 25,865 |  |  |  | € 24,707
Borrowings, maturity | 18 months |  |  |  |
Euro Medium Term Notes [Member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Nominal Amount | € 16,725 |  |  |  |
Borrowings | 16,904 |  |  |  |
Other Bonds [Member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Borrowings | 2,800 |  |  |  |
Ordinary Bonds Issued [Member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Nominal Amount | $ |  | 2,793,000,000 |  |  |
Discount on bond issue and accrued expenses | $ |  | 7,000,000 |  |  |
Borrowings |  | $ 2,800,000,000 |  |  | 17,965
Ordinary Bonds [Member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Nominal Amount | 19,518 |  |  |  |
Discount on bond issue and accrued expenses | 186 |  |  |  |
Borrowings | 19,704 |  |  |  | € 17,965
ENI SPA [Member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Nominal Amount |  |  |  |  |
Discount on bond issue and accrued expenses |  |  |  |  |
Borrowings |  |  |  |  |
Borrowings, original currency | EUR |  |  |  |
Borrowings, maturity |  |  |  |  |
Borrowings, interest rate |  |  |  |  |
ENI SPA [Member] | Euro Medium Term Notes One [Member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Nominal Amount | € 1,500 |  |  |  |
Discount on bond issue and accrued expenses |  |  |  |  |
Borrowings | € 1,517 |  |  |  |
Borrowings, original currency | EUR |  |  |  |
ENI SPA [Member] | Euro Medium Term Notes One [Member] | Top of range [member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Borrowings, maturity | 2019 |  |  |  |
Borrowings, interest rate | 4.125% | 4.125% | 4.125% | 4.125% |
ENI SPA [Member] | Euro Medium Term Notes Two [Member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Nominal Amount | € 1,200 |  |  |  |
Discount on bond issue and accrued expenses |  |  |  |  |
Borrowings | € 1,216 |  |  |  |
Borrowings, original currency | EUR |  |  |  |
ENI SPA [Member] | Euro Medium Term Notes Two [Member] | Top of range [member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Borrowings, maturity | 2025 |  |  |  |
Borrowings, interest rate | 3.75% | 3.75% | 3.75% | 3.75% |
ENI SPA [Member] | Euro Medium Term Notes Three [Member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Nominal Amount | € 1,000 |  |  |  |
Discount on bond issue and accrued expenses |  |  |  |  |
Borrowings | € 1,038 |  |  |  |
Borrowings, original currency | EUR |  |  |  |
ENI SPA [Member] | Euro Medium Term Notes Three [Member] | Top of range [member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Borrowings, maturity | 2020 |  |  |  |
Borrowings, interest rate | 4.25% | 4.25% | 4.25% | 4.25% |
ENI SPA [Member] | Euro Medium Term Notes Five [Member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Nominal Amount | € 1,000 |  |  |  |
Discount on bond issue and accrued expenses |  |  |  |  |
Borrowings | € 1,027 |  |  |  |
Borrowings, original currency | EUR |  |  |  |
ENI SPA [Member] | Euro Medium Term Notes Five [Member] | Top of range [member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Borrowings, maturity | 2029 |  |  |  |
Borrowings, interest rate | 3.625% | 3.625% | 3.625% | 3.625% |
ENI SPA [Member] | Euro Medium Term Notes Six [Member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Nominal Amount | € 1,000 |  |  |  |
Discount on bond issue and accrued expenses |  |  |  |  |
Borrowings | € 1,019 |  |  |  |
Borrowings, original currency | EUR |  |  |  |
ENI SPA [Member] | Euro Medium Term Notes Six [Member] | Top of range [member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Borrowings, maturity | 2020 |  |  |  |
Borrowings, interest rate | 4.00% | 4.00% | 4.00% | 4.00% |
ENI SPA [Member] | Euro Medium Term Notes Seven [Member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Nominal Amount | € 1,000 |  |  |  |
Discount on bond issue and accrued expenses |  |  |  |  |
Borrowings | € 1,009 |  |  |  |
Borrowings, original currency | EUR |  |  |  |
ENI SPA [Member] | Euro Medium Term Notes Seven [Member] | Top of range [member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Borrowings, maturity | 2023 |  |  |  |
Borrowings, interest rate | 3.25% | 3.25% | 3.25% | 3.25% |
ENI SPA [Member] | Euro Medium Term Notes Eight [Member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Nominal Amount | € 1,000 |  |  |  |
Discount on bond issue and accrued expenses |  |  |  |  |
Borrowings | € 1,008 |  |  |  |
Borrowings, original currency | EUR |  |  |  |
ENI SPA [Member] | Euro Medium Term Notes Eight [Member] | Top of range [member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Borrowings, maturity | 2026 |  |  |  |
Borrowings, interest rate | 1.50% | 1.50% | 1.50% | 1.50% |
ENI SPA [Member] | Euro Medium Term Notes Nine [Member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Nominal Amount | € 900 |  |  |  |
Discount on bond issue and accrued expenses |  |  |  |  |
Borrowings | € 895 |  |  |  |
Borrowings, original currency | EUR |  |  |  |
ENI SPA [Member] | Euro Medium Term Notes Nine [Member] | Top of range [member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Borrowings, maturity | 2024 |  |  |  |
Borrowings, interest rate | 0.625% | 0.625% | 0.625% | 0.625% |
ENI SPA [Member] | Euro Medium Term Notes Ten [Member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Nominal Amount | € 800 |  |  |  |
Discount on bond issue and accrued expenses |  |  |  |  |
Borrowings | € 802 |  |  |  |
Borrowings, original currency | EUR |  |  |  |
ENI SPA [Member] | Euro Medium Term Notes Ten [Member] | Top of range [member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Borrowings, maturity | 2021 |  |  |  |
Borrowings, interest rate | 2.625% | 2.625% | 2.625% | 2.625% |
ENI SPA [Member] | Euro Medium Term Notes Eleven [Member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Nominal Amount | € 800 |  |  |  |
Discount on bond issue and accrued expenses |  |  |  |  |
Borrowings | € 799 |  |  |  |
Borrowings, original currency | EUR |  |  |  |
ENI SPA [Member] | Euro Medium Term Notes Eleven [Member] | Top of range [member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Borrowings, maturity | 2028 |  |  |  |
Borrowings, interest rate | 1.625% | 1.625% | 1.625% | 1.625% |
ENI SPA [Member] | Euro Medium Term Notes Twevle [Member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Nominal Amount | € 750 |  |  |  |
Discount on bond issue and accrued expenses |  |  |  |  |
Borrowings | € 764 |  |  |  |
Borrowings, original currency | EUR |  |  |  |
ENI SPA [Member] | Euro Medium Term Notes Twevle [Member] | Top of range [member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Borrowings, maturity | 2019 |  |  |  |
Borrowings, interest rate | 3.75% | 3.75% | 3.75% | 3.75% |
ENI SPA [Member] | Euro Medium Term Notes Thirteen [Member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Nominal Amount | € 750 |  |  |  |
Discount on bond issue and accrued expenses |  |  |  |  |
Borrowings | € 758 |  |  |  |
Borrowings, original currency | EUR |  |  |  |
ENI SPA [Member] | Euro Medium Term Notes Thirteen [Member] | Top of range [member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Borrowings, maturity | 2024 |  |  |  |
Borrowings, interest rate | 1.75% | 1.75% | 1.75% | 1.75% |
ENI SPA [Member] | Euro Medium Term Notes Fourteen [Member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Nominal Amount | € 750 |  |  |  |
Discount on bond issue and accrued expenses |  |  |  |  |
Borrowings | € 755 |  |  |  |
Borrowings, original currency | EUR |  |  |  |
ENI SPA [Member] | Euro Medium Term Notes Fourteen [Member] | Top of range [member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Borrowings, maturity | 2027 |  |  |  |
Borrowings, interest rate | 1.50% | 1.50% | 1.50% | 1.50% |
ENI SPA [Member] | Euro Medium Term Notes Fifteen [Member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Nominal Amount | € 700 |  |  |  |
Discount on bond issue and accrued expenses |  |  |  |  |
Borrowings | € 701 |  |  |  |
Borrowings, original currency | EUR |  |  |  |
ENI SPA [Member] | Euro Medium Term Notes Fifteen [Member] | Top of range [member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Borrowings, maturity | 2022 |  |  |  |
Borrowings, interest rate | 0.75% | 0.75% | 0.75% | 0.75% |
ENI SPA [Member] | Euro Medium Term Notes Sixteen [Member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Nominal Amount | € 650 |  |  |  |
Discount on bond issue and accrued expenses |  |  |  |  |
Borrowings | € 652 |  |  |  |
Borrowings, original currency | EUR |  |  |  |
ENI SPA [Member] | Euro Medium Term Notes Sixteen [Member] | Top of range [member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Borrowings, maturity | 2025 |  |  |  |
Borrowings, interest rate | 1.00% | 1.00% | 1.00% | 1.00% |
ENI SPA [Member] | Euro Medium Term Notes Seventeen [Member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Nominal Amount | € 600 |  |  |  |
Discount on bond issue and accrued expenses |  |  |  |  |
Borrowings | € 595 |  |  |  |
Borrowings, original currency | EUR |  |  |  |
ENI SPA [Member] | Euro Medium Term Notes Seventeen [Member] | Top of range [member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Borrowings, maturity | 2028 |  |  |  |
Borrowings, interest rate | 1.125% | 1.125% | 1.125% | 1.125% |
ENI SPA [Member] | Other Bonds [Member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Nominal Amount | $ |  | $ 873,000,000 |  |  |
Discount on bond issue and accrued expenses | $ |  | 2,000,000 |  |  |
Borrowings | $ |  | $ 875,000,000 |  |  |
Borrowings, original currency | USD |  |  |  |
ENI SPA [Member] | Other Bonds [Member] | Top of range [member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Borrowings, maturity | 2023 |  |  |  |
Borrowings, interest rate | 4.00% | 4.00% | 4.00% | 4.00% |
ENI SPA [Member] | Other bonds One [Member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Nominal Amount | $ |  | $ 873,000,000 |  |  |
Discount on bond issue and accrued expenses | $ |  | 1,000,000 |  |  |
Borrowings | $ |  | $ 874,000,000 |  |  |
Borrowings, original currency | USD |  |  |  |
ENI SPA [Member] | Other bonds One [Member] | Top of range [member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Borrowings, maturity | 2028 |  |  |  |
Borrowings, interest rate | 4.75% | 4.75% | 4.75% | 4.75% |
ENI SPA [Member] | Other bonds Two [Member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Nominal Amount | $ |  | $ 393,000,000 |  |  |
Discount on bond issue and accrued expenses | $ |  | 4,000,000 |  |  |
Borrowings | $ |  | $ 397,000,000 |  |  |
Borrowings, original currency | USD |  |  |  |
ENI SPA [Member] | Other bonds Two [Member] | Top of range [member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Borrowings, maturity | 2020 |  |  |  |
Borrowings, interest rate | 4.15% | 4.15% | 4.15% | 4.15% |
ENI SPA [Member] | Other bonds Three [Member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Nominal Amount | $ |  | $ 305,000,000 |  |  |
Discount on bond issue and accrued expenses | $ |  | 1,000,000 |  |  |
Borrowings | $ |  | $ 306,000,000 |  |  |
Borrowings, original currency | USD |  |  |  |
ENI SPA [Member] | Other bonds Three [Member] | Top of range [member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Borrowings, maturity | 2040 |  |  |  |
Borrowings, interest rate | 5.70% | 5.70% | 5.70% | 5.70% |
ENI SPA [Member] | Ordinary Bonds [Member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Discount on bond issue and accrued expenses | € 2 |  |  |  |
Eni Finance International SA [Member] | Euro Medium Term Notes Eighteen [Member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Nominal Amount | £ |  |  | £ 335 |  |
Discount on bond issue and accrued expenses | £ |  |  | 15 |  |
Borrowings | £ |  |  | £ 350 |  |
Borrowings, original currency | GBP |  |  |  |
Eni Finance International SA [Member] | Euro Medium Term Notes Eighteen [Member] | Top of range [member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Borrowings, maturity | 2021 |  |  |  |
Borrowings, interest rate | 5.00% | 5.00% | 5.00% | 5.00% |
Eni Finance International SA [Member] | Euro Medium Term Notes Eighteen [Member] | Bottom of range [member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Borrowings, maturity | 2019 |  |  |  |
Borrowings, interest rate | 4.75% | 4.75% | 4.75% | 4.75% |
Eni Finance International SA [Member] | Euro Medium Term Notes Nineteen [Member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Nominal Amount | € 295 |  |  |  |
Discount on bond issue and accrued expenses | 4 |  |  |  |
Borrowings | € 299 |  |  |  |
Borrowings, original currency | EUR |  |  |  |
Eni Finance International SA [Member] | Euro Medium Term Notes Nineteen [Member] | Top of range [member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Borrowings, maturity | 2043 |  |  |  |
Borrowings, interest rate | 5.441% | 5.441% | 5.441% | 5.441% |
Eni Finance International SA [Member] | Euro Medium Term Notes Nineteen [Member] | Bottom of range [member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Borrowings, maturity | 2028 |  |  |  |
Borrowings, interest rate | 3.875% | 3.875% | 3.875% | 3.875% |
Eni Finance International SA [Member] | Euro Medium Term Notes Twenty [Member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Nominal Amount | ¥ |  |  |  | ¥ 167 |
Borrowings | ¥ |  |  |  | ¥ 167 |
Borrowings, original currency | YEN |  |  |  |
Eni Finance International SA [Member] | Euro Medium Term Notes Twenty [Member] | Top of range [member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Borrowings, maturity | 2037 |  |  |  |
Borrowings, interest rate | 2.81% | 2.81% | 2.81% | 2.81% |
Eni Finance International SA [Member] | Euro Medium Term Notes Twenty [Member] | Bottom of range [member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Borrowings, maturity | 2019 |  |  |  |
Borrowings, interest rate | 1.955% | 1.955% | 1.955% | 1.955% |
Eni Finance International SA [Member] | Euro Medium Term Notes Twenty One [Member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Nominal Amount | $ |  | $ 1,528,000,000 |  |  |
Discount on bond issue and accrued expenses | $ |  | 5,000,000 |  |  |
Borrowings | $ |  | 1,533,000,000 |  |  |
Borrowings, original currency | USD |  |  |  |
Eni Finance International SA [Member] | Euro Medium Term Notes Twenty One [Member] | Top of range [member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Borrowings, maturity | 2027 |  |  |  |
Eni Finance International SA [Member] | Euro Medium Term Notes Twenty One [Member] | Bottom of range [member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Borrowings, maturity | 2026 |  |  |  |
Eni USA Inc [Member] | Other Bonds Four [Member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Nominal Amount | $ |  | 349,000,000 |  |  |
Discount on bond issue and accrued expenses | $ |  | (1,000,000) |  |  |
Borrowings | $ |  | $ 348,000,000 |  |  |
Borrowings, original currency | USD |  |  |  |
Eni USA Inc [Member] | Other Bonds Four [Member] | Top of range [member] |  |  |  |  |
Disclosure Of Information on net borrowings [Line Items] |  |  |  |  |
Borrowings, maturity | 2027 |  |  |  |
Borrowings, interest rate | 7.30% | 7.30% | 7.30% | 7.30% |

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