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Financial liabilities (Tables) | 12 Months Ended
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Dec. 31, 2018
Statements [Line Items] |
Disclosure of reconciliation of liabilities arising from financing activities [text block] |
(€ million) |  | Long-term debt and current portion of long-term debt |  | Short-term debt |  | Total
Carrying amount at December 31, 2017 |  |  | 22,465 |  |  |  | 2,242 |  |  |  | 24,707 |
Cash flows |  |  | 1,033 |  |  |  | (713 | ) |  |  | 320 |
Currency translation differences |  |  | 126 |  |  |  | 188 |  |  |  | 314 |
Changes in the scope of consolidation |  |  |  |  |  |  | 494 |  |  |  | 494 |
Other non-monetary changes |  |  | 59 |  |  |  | (29 | ) |  |  | 30 |
Carrying amount at December 31, 2018 |  |  | 23,683 |  |  |  | 2,182 |  |  |  | 25,865 |
Fair value [Member] |
Statements [Line Items] |
Disclosure of detailed information about borrowings [text block] | Fair value of long-term debt, including the current portion of long-term debt is described below:
(€ million) |  |  | December 31, 2018 |  |  | December 31, 2017 |
Ordinary bonds |  |  |  |  | 20,257 |  |  |  |  |  | 19,219 |  |
Convertible bonds |  |  |  |  | 399 |  |  |  |  |  | 410 |  |
Banks |  |  |  |  | 3,445 |  |  |  |  |  | 4,021 |  |
Other financial institutions |  |  |  |  | 111 |  |  |  |  |  | 114 |  |
|  |  |  |  | 24,212 |  |  |  |  |  | 23,764 |  |
By Currency [Member] |
Statements [Line Items] |
Disclosure of detailed information about borrowings [text block] | The following table provides a breakdown by currency of long-term debt, its current portion and the related weighted average interest rates:
|  | December 31, 2018 |  | December 31, 2017
|  | Short term debt (€ million) |  | Average rate (%) |  | Long term debt and current portion of long term debt (€ million) |  | Average rate (%) |  | Short term debt (€ million) |  | Average rate (%) |  | Long term debt and current portion of long term debt (€ million) |  | Average rate (%)
Euro |  |  | 680 |  |  |  | 1.9 |  |  |  | 18,635 |  |  |  | 2.3 |  |  |  | 904 |  |  |  | 0.5 |  |  |  | 20,094 |  |  |  | 2.4 |
U.S. dollar |  |  | 1,007 |  |  |  | 2.5 |  |  |  | 4,530 |  |  |  | 4.3 |  |  |  | 1,329 |  |  |  | 1.8 |  |  |  | 1,694 |  |  |  | 4.8 |
Other currencies |  |  | 495 |  |  |  | 1.0 |  |  |  | 518 |  |  |  | 4.2 |  |  |  | 9 |  |  |  | (0.7 | ) |  |  | 677 |  |  |  | 4.7 |
|  |  | 2,182 |  |  |  |  |  |  |  | 23,683 |  |  |  |  |  |  |  | 2,242 |  |  |  |  |  |  |  | 22,465 |  |  |  |  |
Long term and current portion of long term borrowings [Member] |
Statements [Line Items] |
Disclosure of detailed information about borrowings [text block] |
|  | December 31, 2018 |  | December 31, 2017
(€ million) |  | Short-term debt |  | Current portion of long-term debt |  | Long-term debt |  | Total |  | Short-term debt |  | Current portion of long-term debt |  | Long-term debt |  | Total
Banks |  |  | 383 |  |  |  | 768 |  |  |  | 2,710 |  |  |  | 3,861 |  |  |  | 201 |  |  |  | 801 |  |  |  | 3,200 |  |  |  | 4,202 |
Ordinary bonds |  |  |  |  |  |  | 2,781 |  |  |  | 16,923 |  |  |  | 19,704 |  |  |  |  |  |  |  | 1,445 |  |  |  | 16,520 |  |  |  | 17,965 |
Convertible bonds |  |  |  |  |  |  |  |  |  |  | 390 |  |  |  | 390 |  |  |  |  |  |  |  |  |  |  |  | 387 |  |  |  | 387 |
Commercial papers |  |  | 915 |  |  |  |  |  |  |  |  |  |  |  | 915 |  |  |  | 1,664 |  |  |  |  |  |  |  |  |  |  |  | 1,664 |
Other financial institutions |  |  | 884 |  |  |  | 52 |  |  |  | 59 |  |  |  | 995 |  |  |  | 377 |  |  |  | 40 |  |  |  | 72 |  |  |  | 489 |
|  |  | 2,182 |  |  |  | 3,601 |  |  |  | 20,082 |  |  |  | 25,865 |  |  |  | 2,242 |  |  |  | 2,286 |  |  |  | 20,179 |  |  |  | 24,707 |
Long term and current portion of long term borrowings [Member] | Maturity [Member] |
Statements [Line Items] |
Disclosure of detailed information about borrowings [text block] | The following table reflects long-term debt and current portion of long-term debt as of December 31, 2018 by maturity:
|  |  | Long-term debt
(€ million) |  |  | 2020 |  | 2021 |  | 2022 |  | 2023 |  | After |  | Total
Banks |  |  |  | 556 |  |  |  | 345 |  |  |  | 393 |  |  |  | 829 |  |  |  | 587 |  |  |  | 2,710 |
Ordinary bonds |  |  |  | 2,391 |  |  |  | 921 |  |  |  | 698 |  |  |  | 1,858 |  |  |  | 11,055 |  |  |  | 16,923 |
Convertible bonds |  |  |  |  |  |  |  |  |  |  |  | 390 |  |  |  |  |  |  |  |  |  |  |  | 390 |
Other financial institutions |  |  |  | 9 |  |  |  | 10 |  |  |  | 9 |  |  |  | 11 |  |  |  | 20 |  |  |  | 59 |
|  |  |  | 2,956 |  |  |  | 1,276 |  |  |  | 1,490 |  |  |  | 2,698 |  |  |  | 11,662 |  |  |  | 20,082 |
Ordinary Bonds [Member] | Maturity [Member] |
Statements [Line Items] |
Disclosure of detailed information about borrowings [text block] | The following table provides a breakdown of ordinary bonds by issuing entity, maturity date, interest rate and currency as of December 31, 2018:
|  |  |  | Discount on bond issue and |  |  |  |  |  | Maturity |  | Rate %
(€ million) |  | Amount |  | accrued expense |  | Total |  | Currency |  | from |  | to |  | from |  | to
Issuing entity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Euro Medium Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Eni SpA |  |  | 1,500 |  |  | 17 |  |  | 1,517 |  |  |  | EUR |  |  |  |  |  |  |  | 2019 |  |  |  |  |  |  |  | 4.125 |
Eni SpA |  |  | 1,200 |  |  | 16 |  |  | 1,216 |  |  |  | EUR |  |  |  |  |  |  |  | 2025 |  |  |  |  |  |  |  | 3.750 |
Eni SpA |  |  | 1,000 |  |  | 38 |  |  | 1,038 |  |  |  | EUR |  |  |  |  |  |  |  | 2020 |  |  |  |  |  |  |  | 4.250 |
Eni SpA |  |  | 1,000 |  |  | 27 |  |  | 1,027 |  |  |  | EUR |  |  |  |  |  |  |  | 2029 |  |  |  |  |  |  |  | 3.625 |
Eni SpA |  |  | 1,000 |  |  | 19 |  |  | 1,019 |  |  |  | EUR |  |  |  |  |  |  |  | 2020 |  |  |  |  |  |  |  | 4.000 |
Eni SpA |  |  | 1,000 |  |  | 9 |  |  | 1,009 |  |  |  | EUR |  |  |  |  |  |  |  | 2023 |  |  |  |  |  |  |  | 3.250 |
Eni SpA |  |  | 1,000 |  |  | 8 |  |  | 1,008 |  |  |  | EUR |  |  |  |  |  |  |  | 2026 |  |  |  |  |  |  |  | 1.500 |
Eni SpA |  |  | 900 |  |  | (5 | ) |  | 895 |  |  |  | EUR |  |  |  |  |  |  |  | 2024 |  |  |  |  |  |  |  | 0.625 |
Eni SpA |  |  | 800 |  |  | 2 |  |  | 802 |  |  |  | EUR |  |  |  |  |  |  |  | 2021 |  |  |  |  |  |  |  | 2.625 |
Eni SpA |  |  | 800 |  |  | (1 | ) |  | 799 |  |  |  | EUR |  |  |  |  |  |  |  | 2028 |  |  |  |  |  |  |  | 1.625 |
Eni SpA |  |  | 750 |  |  | 14 |  |  | 764 |  |  |  | EUR |  |  |  |  |  |  |  | 2019 |  |  |  |  |  |  |  | 3.750 |
Eni SpA |  |  | 750 |  |  | 8 |  |  | 758 |  |  |  | EUR |  |  |  |  |  |  |  | 2024 |  |  |  |  |  |  |  | 1.750 |
Eni SpA |  |  | 750 |  |  | 5 |  |  | 755 |  |  |  | EUR |  |  |  |  |  |  |  | 2027 |  |  |  |  |  |  |  | 1.500 |
Eni SpA |  |  | 700 |  |  | 1 |  |  | 701 |  |  |  | EUR |  |  |  |  |  |  |  | 2022 |  |  |  |  |  |  |  | 0.750 |
Eni SpA |  |  | 650 |  |  | 2 |  |  | 652 |  |  |  | EUR |  |  |  |  |  |  |  | 2025 |  |  |  |  |  |  |  | 1.000 |
Eni SpA |  |  | 600 |  |  | (5 | ) |  | 595 |  |  |  | EUR |  |  |  |  |  |  |  | 2028 |  |  |  |  |  |  |  | 1.125 |
Eni Finance International SA |  |  | 335 |  |  | 15 |  |  | 350 |  |  |  | GBP |  |  |  | 2019 |  |  |  | 2021 |  |  |  | 4.750 |  |  |  | 5.000 |
Eni Finance International SA |  |  | 295 |  |  | 4 |  |  | 299 |  |  |  | EUR |  |  |  | 2028 |  |  |  | 2043 |  |  |  | 3.875 |  |  |  | 5.441 |
Eni Finance International SA |  |  | 167 |  |  |  |  |  | 167 |  |  |  | YEN |  |  |  | 2019 |  |  |  | 2037 |  |  |  | 1.955 |  |  |  | 2.810 |
Eni Finance International SA |  |  | 1,528 |  |  | 5 |  |  | 1,533 |  |  |  | USD |  |  |  | 2026 |  |  |  | 2027 |  |  |  |  |  |  |  | variable |
|  |  | 16,725 |  |  | 179 |  |  | 16,904 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Eni SpA |  |  | 873 |  |  | 2 |  |  | 875 |  |  |  | USD |  |  |  |  |  |  |  | 2023 |  |  |  |  |  |  |  | 4.000 |
Eni SpA |  |  | 873 |  |  | 1 |  |  | 874 |  |  |  | USD |  |  |  |  |  |  |  | 2028 |  |  |  |  |  |  |  | 4.750 |
Eni SpA |  |  | 393 |  |  | 4 |  |  | 397 |  |  |  | USD |  |  |  |  |  |  |  | 2020 |  |  |  |  |  |  |  | 4.150 |
Eni SpA |  |  | 305 |  |  | 1 |  |  | 306 |  |  |  | USD |  |  |  |  |  |  |  | 2040 |  |  |  |  |  |  |  | 5.700 |
Eni USA Inc |  |  | 349 |  |  | (1 | ) |  | 348 |  |  |  | USD |  |  |  |  |  |  |  | 2027 |  |  |  |  |  |  |  | 7.300 |
|  |  | 2,793 |  |  | 7 |  |  | 2,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  |  | 19,518 |  |  | 186 |  |  | 19,704 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Bonds [Member] | Maturity [Member] |
Statements [Line Items] |
Disclosure of detailed information about borrowings [text block] | The following table provides a breakdown of convertible bonds issued by Eni SpA as of December 31, 2018:
(€ million) |  | Amount |  | Discount on bond issue and accrued expense |  | Total |  | Currency |  | Maturity |  | Rate %
Eni SpA |  |  | 400 |  |  |  | (10) |  |  |  | 390 |  |  |  | EUR |  |  |  | 2022 |  |  |  | 0.000 |

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