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Long-term debt and current portion of long-term debt (Tables) | 12 Months Ended
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Dec. 31, 2017
StatementsLineItems [Line Items] |
Disclosure of detailed information about long-term and short term debt [text block] |
|  | December 31, 2017 |  | December 31, 2016
(€ million) |  | Long-term portion |  | Short-term portion |  | Total |  | Long-term portion |  | Short-term portion |  | Total
Banks |  |  | 3,200 |  |  |  | 801 |  |  |  | 4,001 |  |  |  | 4,014 |  |  |  | 272 |  |  |  | 4,286 |
Ordinary bonds |  |  | 16,520 |  |  |  | 1,445 |  |  |  | 17,965 |  |  |  | 16,044 |  |  |  | 2,959 |  |  |  | 19,003 |
Convertible bonds |  |  | 387 |  |  |  |  |  |  |  | 387 |  |  |  | 383 |  |  |  |  |  |  |  | 383 |
Other financial institutions |  |  | 72 |  |  |  | 40 |  |  |  | 112 |  |  |  | 123 |  |  |  | 48 |  |  |  | 171 |
|  |  | 20,179 |  |  |  | 2,286 |  |  |  | 22,465 |  |  |  | 20,564 |  |  |  | 3,279 |  |  |  | 23,843 |
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, 2017 by maturity:
|  | At December 31, |  | Long-term maturity
(€ million) |  | Maturity range |  | 31.12.2017 |  | 2019 |  | 2020 |  | 2021 |  | 2022 |  | After |  | Total |  | Current maturity 2018
Banks |  | 2018 – 2032 |  |  | 4,001 |  |  |  | 1,290 |  |  |  | 729 |  |  |  | 341 |  |  |  | 143 |  |  |  | 697 |  |  |  | 3,200 |  |  |  | 801 |
Ordinary bonds |  | 2018 – 2043 |  |  | 17,965 |  |  |  | 2,486 |  |  |  | 2,371 |  |  |  | 934 |  |  |  | 697 |  |  |  | 10,032 |  |  |  | 16,520 |  |  |  | 1,445 |
Convertible bonds |  | 2022 |  |  | 387 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 387 |  |  |  |  |  |  |  | 387 |  |  |  |  |
Other financial institutions |  | 2018 – 2032 |  |  | 112 |  |  |  | 45 |  |  |  | 3 |  |  |  | 3 |  |  |  | 3 |  |  |  | 18 |  |  |  | 72 |  |  |  | 40 |
|  |  |  |  | 22,465 |  |  |  | 3,821 |  |  |  | 3,103 |  |  |  | 1,278 |  |  |  | 1,230 |  |  |  | 10,747 |  |  |  | 20,179 |  |  |  | 2,286 |
Disclosure of detailed information about currency wise breakdown of long-term debt [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, 2017 (€ million) |  | Average rate (%) |  | December 31, 2016 (€ million) |  | Average rate (%)
Euro |  |  | 20,094 |  |  |  | 2.4 |  |  |  | 21,545 |  |  |  | 2.7 |
U.S. dollar |  |  | 1,694 |  |  |  | 4.8 |  |  |  | 1,587 |  |  |  | 5.2 |
British pound |  |  | 521 |  |  |  | 5.3 |  |  |  | 540 |  |  |  | 5.3 |
Japanese yen |  |  | 156 |  |  |  | 2.6 |  |  |  | 171 |  |  |  | 2.6 |
|  |  | 22,465 |  |  |  |  |  |  |  | 23,843 |  |  |  |  |
Disclosure of detailed information about fair value of long-term debt, including the current portion of long-term debt [text block] | Fair value of long-term debt, including the current portion of long-term debt amounted to €23,764 million (€25,358 million at December 31, 2016):
(€ million) |  | December 31, 2017 |  | December 31, 2016
Ordinary bonds |  |  | 19,219 |  |  |  | 20,501 |
Convertible bonds |  |  | 410 |  |  |  | 435 |
Banks |  |  | 4,021 |  |  |  | 4,244 |
Other financial institutions |  |  | 114 |  |  |  | 178 |
|  |  | 23,764 |  |  |  | 25,358 |
Disclosure of detailed information of net borrowings [text block] | Eni’s presentation and calculation of net borrowings and leverage may not be comparable to that of other companies.
|  | December 31, 2017 |  | December 31, 2016
(€ million) |  | Current |  | Non- current |  | Total |  | Current |  | Non- current |  | Total
A. Cash and cash equivalents |  |  | 7,363 |  |  |  |  |  |  |  | 7,363 |  |  |  | 5,674 |  |  |  |  |  |  |  | 5,674 |
B. Held-for-trading financial assets |  |  | 6,012 |  |  |  |  |  |  |  | 6,012 |  |  |  | 6,166 |  |  |  |  |  |  |  | 6,166 |
C. Available-for-sale financial assets |  |  | 207 |  |  |  |  |  |  |  | 207 |  |  |  | 238 |  |  |  |  |  |  |  | 238 |
D. Liquidity (A+B+C) |  |  | 13,582 |  |  |  |  |  |  |  | 13,582 |  |  |  | 12,078 |  |  |  |  |  |  |  | 12,078 |
E. Financing receivables |  |  | 209 |  |  |  |  |  |  |  | 209 |  |  |  | 385 |  |  |  |  |  |  |  | 385 |
F. Short-term debt towards banks |  |  | 201 |  |  |  |  |  |  |  | 201 |  |  |  | 155 |  |  |  |  |  |  |  | 155 |
G. Long-term debt towards banks |  |  | 801 |  |  |  | 3,200 |  |  |  | 4,001 |  |  |  | 272 |  |  |  | 4,014 |  |  |  | 4,286 |
H. Bonds |  |  | 1,445 |  |  |  | 16,907 |  |  |  | 18,352 |  |  |  | 2,959 |  |  |  | 16,427 |  |  |  | 19,386 |
I. Short-term debt towards related parties |  |  | 164 |  |  |  |  |  |  |  | 164 |  |  |  | 191 |  |  |  |  |  |  |  | 191 |
L. Other short-term liabilities |  |  | 1,877 |  |  |  |  |  |  |  | 1,877 |  |  |  | 3,050 |  |  |  |  |  |  |  | 3,050 |
M. Other long-term liabilities |  |  | 40 |  |  |  | 72 |  |  |  | 112 |  |  |  | 48 |  |  |  | 123 |  |  |  | 171 |
N. Total borrowings (F+G+H+I+L+M) |  |  | 4,528 |  |  |  | 20,179 |  |  |  | 24,707 |  |  |  | 6,675 |  |  |  | 20,564 |  |  |  | 27,239 |
O. Net borrowings (N-D-E) |  |  | (9,263 | ) |  |  | 20,179 |  |  |  | 10,916 |  |  |  | (5,788 | ) |  |  | 20,564 |  |  |  | 14,776 |
Disclosure of reconciliation of liabilities arising from financing activities [text block] | Changes in gross borrowings were as following:
(€ million) |  | Long-term debt and current portion of long-term debt |  | Short-term debt |  | Total
Carrying amount at December 31, 2016 |  |  | 23,843 |  |  |  | 3,396 |  |  |  | 27,239 |
Cash flows |  |  | (1,131 | ) |  |  | (581 | ) |  |  | (1,712 | )
Currency translation differences |  |  | (236 | ) |  |  | (574 | ) |  |  | (810 | )
Other non-monetary changes |  |  | (11 | ) |  |  | 1 |  |  |  | (10 | )
Carrying amount at December 31, 2017 |  |  | 22,465 |  |  |  | 2,242 |  |  |  | 24,707 |
Ordinary Bonds [Member] |
StatementsLineItems [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, 2017:
|  |  |  | Discount on bond issue and accrued |  |  |  |  |  | Maturity |  | Rate %
(€ million) |  | Amount |  | expense |  | Total |  | Currency |  | from |  | to |  | from |  | to
Issuing entity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Euro Medium Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Eni SpA |  |  | 1,500 |  |  |  | 16 |  |  |  | 1,516 |  |  |  | EUR |  |  |  |  |  |  |  | 2019 |  |  |  |  |  |  |  | 4.125 |
Eni SpA |  |  | 1,200 |  |  |  | 17 |  |  |  | 1,217 |  |  |  | EUR |  |  |  |  |  |  |  | 2025 |  |  |  |  |  |  |  | 3.750 |
Eni SpA |  |  | 1,000 |  |  |  | 37 |  |  |  | 1,037 |  |  |  | EUR |  |  |  |  |  |  |  | 2020 |  |  |  |  |  |  |  | 4.250 |
Eni SpA |  |  | 1,000 |  |  |  | 32 |  |  |  | 1,032 |  |  |  | EUR |  |  |  |  |  |  |  | 2018 |  |  |  |  |  |  |  | 3.500 |
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 |  |  |  | 8 |  |  |  | 1,008 |  |  |  | EUR |  |  |  |  |  |  |  | 2023 |  |  |  |  |  |  |  | 3.250 |
Eni SpA |  |  | 1,000 |  |  |  | 7 |  |  |  | 1,007 |  |  |  | EUR |  |  |  |  |  |  |  | 2026 |  |  |  |  |  |  |  | 1.500 |
Eni SpA |  |  | 900 |  |  |  | (6 | ) |  |  | 894 |  |  |  | EUR |  |  |  |  |  |  |  | 2024 |  |  |  |  |  |  |  | 0.625 |
Eni SpA |  |  | 800 |  |  |  | 1 |  |  |  | 801 |  |  |  | EUR |  |  |  |  |  |  |  | 2021 |  |  |  |  |  |  |  | 2.625 |
Eni SpA |  |  | 800 |  |  |  | (2 | ) |  |  | 798 |  |  |  | EUR |  |  |  |  |  |  |  | 2028 |  |  |  |  |  |  |  | 1.625 |
Eni SpA |  |  | 750 |  |  |  | 13 |  |  |  | 763 |  |  |  | EUR |  |  |  |  |  |  |  | 2019 |  |  |  |  |  |  |  | 3.750 |
Eni SpA |  |  | 750 |  |  |  | 7 |  |  |  | 757 |  |  |  | EUR |  |  |  |  |  |  |  | 2024 |  |  |  |  |  |  |  | 1.750 |
Eni SpA |  |  | 750 |  |  |  | 4 |  |  |  | 754 |  |  |  | EUR |  |  |  |  |  |  |  | 2027 |  |  |  |  |  |  |  | 1.500 |
Eni SpA |  |  | 700 |  |  |  |  |  |  |  | 700 |  |  |  | EUR |  |  |  |  |  |  |  | 2022 |  |  |  |  |  |  |  | 0.750 |
Eni SpA |  |  | 650 |  |  |  | (1 | ) |  |  | 649 |  |  |  | EUR |  |  |  |  |  |  |  | 2025 |  |  |  |  |  |  |  | 1.000 |
Eni SpA |  |  | 600 |  |  |  | (6 | ) |  |  | 594 |  |  |  | EUR |  |  |  |  |  |  |  | 2028 |  |  |  |  |  |  |  | 1.125 |
Eni Finance International SA |  |  | 507 |  |  |  | 15 |  |  |  | 522 |  |  |  | GBP |  |  |  | 2018 |  |  |  | 2021 |  |  |  | 4.750 |  |  |  | 6.125 |
Eni Finance International SA |  |  | 295 |  |  |  | 3 |  |  |  | 298 |  |  |  | EUR |  |  |  | 2028 |  |  |  | 2043 |  |  |  | 3.875 |  |  |  | 5.441 |
Eni Finance International SA |  |  | 155 |  |  |  | 1 |  |  |  | 156 |  |  |  | YEN |  |  |  | 2019 |  |  |  | 2037 |  |  |  | 1.955 |  |  |  | 2.810 |
Eni Finance International SA |  |  | 417 |  |  |  | (3 | ) |  |  | 414 |  |  |  | USD |  |  |  |  |  |  |  | 2026 |  |  |  |  |  |  |  | variable |
|  |  | 16,774 |  |  |  | 189 |  |  |  | 16,963 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Eni SpA |  |  | 375 |  |  |  | 3 |  |  |  | 378 |  |  |  | USD |  |  |  |  |  |  |  | 2020 |  |  |  |  |  |  |  | 4.150 |
Eni SpA |  |  | 292 |  |  |  |  |  |  |  | 292 |  |  |  | USD |  |  |  |  |  |  |  | 2040 |  |  |  |  |  |  |  | 5.700 |
Eni USA Inc |  |  | 333 |  |  |  | (1 | ) |  |  | 332 |  |  |  | USD |  |  |  |  |  |  |  | 2027 |  |  |  |  |  |  |  | 7.300 |
|  |  | 1,000 |  |  |  | 2 |  |  |  | 1,002 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  |  | 17,774 |  |  |  | 191 |  |  |  | 17,965 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Bonds [Member] |
StatementsLineItems [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, 2017:
(€ million) |  | Amount |  | Discount on bond issue and accrued expense |  | Total |  | Currency |  | Maturity |  | Rate %
Issuing entity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Eni SpA |  |  | 400 |  |  |  | (13 | ) |  |  | 387 |  |  |  | EUR |  |  |  | 2022 |  |  |  | 0.000 |
|  |  | 400 |  |  |  | (13 | ) |  |  | 387 |  |  |  |  |  |  |  |  |  |  |  |  |

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