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Finance debt (Tables) | 12 Months Ended
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Dec. 31, 2022
Disclosure of detailed information about borrowings [line items] |
Schedule of finance debt |
| December 31, 2022 |  |  | December 31, 2021
| 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
(€ million) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Banks | 3,645 |  |  | 851 |  |  | 1,999 |  |  | 6,495 |  |  | 362 |  |  | 347 |  |  | 4,650 |  |  | 5,359
Ordinary bonds |  |  |  | 2,140 |  |  | 16,372 |  |  | 18,512 |  |  |  |  |  | 913 |  |  | 18,049 |  |  | 18,962
Convertible bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 399 |  |  |  |  |  | 399
Sustainability-Linked Bond |  |  |  | 2 |  |  | 996 |  |  | 998 |  |  |  |  |  | 2 |  |  | 996 |  |  | 998
Commercial papers | 34 |  |  |  |  |  |  |  |  | 34 |  |  | 836 |  |  |  |  |  |  |  |  | 836
Other financial institutions | 767 |  |  | 104 |  |  | 7 |  |  | 878 |  |  | 1,101 |  |  | 120 |  |  | 19 |  |  | 1,240
| 4,446 |  |  | 3,097 |  |  | 19,374 |  |  | 26,917 |  |  | 2,299 |  |  | 1,781 |  |  | 23,714 |  |  | 27,794
Schedule of breakdown of committed borrowing facilities |
(€ million) | December 31, 2022 |  |  | December 31, 2021 |
Undrawn long-term Sustainability-Linked bonds | 8,100 |  |  | 2,800 |
Other undrawn long-term borrowing facilities | 2 |  |  | 20 |
Drawn long-term Sustainability-Linked bonds |  |  |  | 2,050 |
Other drawn long-term borrowing facilities | 70 |  |  | 162 |
Long-term borrowing facilities | 8,172 |  |  | 5,032 |
Other undrawn short-term borrowing facilities | 43 |  |  | 15 |
Other drawn short-term borrowing facilities | 83 |  |  | 67 |
Short-term borrowing facilities | 126 |  |  | 82 |
| 8,298 |  |  | 5,114 |
Schedule of fair value of long-term debt | Fair value of long-term debt, including the current portion of long-term debt is described below:
(€ million) | December 31, 2022 |  |  | December 31, 2021 |
Ordinary bonds and Sustainability-Linked Bond | 18,167 |  |  | 23,070 |
Convertible bonds |  |  |  | 513 |
Banks | 2,733 |  |  | 5,029 |
Other financial institutions | 111 |  |  | 138 |
| 21,011 |  |  | 28,750 |
Schedule of changes in liabilities arising from financing activities |
(€ million) | Long-term debt and current portion of long-term debt |  |  | Short-term debt |  |  | Long-term and current portion of long-term lease liabilietis |  |  | Total |
Carrying amount at December 31, 2021 | 25,495 |  |  | 2,299 |  |  | 5,337 |  |  | 33,131 |
Cash flows | (3,944 | ) |  | 1,375 |  |  | (994 | ) |  | (3,563 | )
Currency translation differences | 208 |  |  | 547 |  |  | 289 |  |  | 1,044 |
Changes in the scope of consolidation | 477 |  |  | (95 | ) |  | (1,953 | ) |  | (1,571 | )
Other non-monetary changes | 235 |  |  | 320 |  |  | 2,272 |  |  | 2,827 |
Carrying amount at December 31, 2022 | 22,471 |  |  | 4,446 |  |  | 4,951 |  |  | 31,868 |
Carrying amount at December 31, 2020 | 23,804 |  |  | 2,882 |  |  | 5,018 |  |  | 31,704 |
Cash flows | 666 |  |  | (910 | ) |  | (939 | ) |  | (1,183 | )
Currency translation differences | 255 |  |  | 153 |  |  | 303 |  |  | 711 |
Changes in the scope of consolidation | 545 |  |  | 160 |  |  | 103 |  |  | 808 |
Other non-monetary changes | 225 |  |  | 14 |  |  | 852 |  |  | 1,091 |
Carrying amount at December 31, 2021 | 25,495 |  |  | 2,299 |  |  | 5,337 |  |  | 33,131 |
Currency |
Disclosure of detailed information about borrowings [line items] |
Schedule of finance debt |
| December 31, 2022 |  |  | December 31, 2021 |
| 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 | 3,994 |  |  | 0.9 |  |  | 17,171 |  |  | 1.8 |  |  | 1,356 |  |  |  |  |  | 20,399 |  |  | 1.5 |
U.S. dollar | 337 |  |  | 2.2 |  |  | 5,298 |  |  | 5.1 |  |  | 928 |  |  | 0.2 |  |  | 5,096 |  |  | 3.8 |
Other currencies | 115 |  |  |  |  |  | 2 |  |  | 2.4 |  |  | 15 |  |  | (0.3 | ) |  |  |  |  |  |
| 4,446 |  |  |  |  |  | 22,471 |  |  |  |  |  | 2,299 |  |  |  |  |  | 25,495 |  |  |  |
Ordinary Bonds |
Disclosure of detailed information about borrowings [line items] |
Schedule of finance debt | The following table provides a breakdown of ordinary bonds by issuing entity, maturity date, interest rate and currency as of December 31, 2022:
(€ million) | Amount |  |  | Discount on bond issue and accrued expense |  |  | Total |  |  | Currency |  |  | Maturity |  |  | Rate % |
|  |  |  |  |  |  |  | from |  |  | to |  |  | from |  |  | to |
Issuing entity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Euro Medium Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Eni SpA | 1,200 |  |  | 15 |  |  | 1,215 |  |  | EUR |  |  |  |  |  | 2025 |  |  |  |  |  | 3.750 |
Eni SpA | 1,000 |  |  | 29 |  |  | 1,029 |  |  | EUR |  |  |  |  |  | 2029 |  |  |  |  |  | 3.625 |
Eni SpA | 1,000 |  |  | 15 |  |  | 1,015 |  |  | EUR |  |  |  |  |  | 2023 |  |  |  |  |  | 3.250 |
Eni SpA | 1,000 |  |  | 11 |  |  | 1,011 |  |  | EUR |  |  |  |  |  | 2026 |  |  |  |  |  | 1.500 |
Eni SpA | 1,000 |  |  | 10 |  |  | 1,010 |  |  | EUR |  |  |  |  |  | 2031 |  |  |  |  |  | 2.000 |
Eni SpA | 1,000 |  |  | 3 |  |  | 1,003 |  |  | EUR |  |  |  |  |  | 2026 |  |  |  |  |  | 1.250 |
Eni SpA | 1,000 |  |  | 3 |  |  | 1,003 |  |  | EUR |  |  |  |  |  | 2030 |  |  |  |  |  | 0.625 |
Eni SpA | 900 |  |  |  |  |  | 900 |  |  | EUR |  |  |  |  |  | 2024 |  |  |  |  |  | 0.625 |
Eni SpA | 800 |  |  | 2 |  |  | 802 |  |  | EUR |  |  |  |  |  | 2028 |  |  |  |  |  | 1.625 |
Eni SpA | 750 |  |  | 11 |  |  | 761 |  |  | EUR |  |  |  |  |  | 2024 |  |  |  |  |  | 1.750 |
Eni SpA | 750 |  |  | 8 |  |  | 758 |  |  | EUR |  |  |  |  |  | 2027 |  |  |  |  |  | 1.500 |
Eni SpA | 750 |  |  | (3 | ) |  | 747 |  |  | EUR |  |  |  |  |  | 2034 |  |  |  |  |  | 1.000 |
Eni SpA | 650 |  |  | 4 |  |  | 654 |  |  | EUR |  |  |  |  |  | 2025 |  |  |  |  |  | 1.000 |
Eni SpA | 600 |  |  | (2 | ) |  | 598 |  |  | EUR |  |  |  |  |  | 2028 |  |  |  |  |  | 1.125 |
Eni Finance International SA | 1,639 |  |  | 6 |  |  | 1,645 |  |  | USD |  |  | 2026 |  |  | 2027 |  |  |  |  |  | variable |
Eni Finance International SA | 795 |  |  | 7 |  |  | 802 |  |  | EUR |  |  | 2025 |  |  | 2043 |  |  | 1.275 |  |  | 5.441 |
| 14,834 |  |  | 119 |  |  | 14,953 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Eni SpA | 937 |  |  | 10 |  |  | 947 |  |  | USD |  |  |  |  |  | 2023 |  |  |  |  |  | 4.000 |
Eni SpA | 937 |  |  | 5 |  |  | 942 |  |  | USD |  |  |  |  |  | 2028 |  |  |  |  |  | 4.750 |
Eni SpA | 937 |  |  | 1 |  |  | 938 |  |  | USD |  |  |  |  |  | 2029 |  |  |  |  |  | 4.250 |
Eni SpA | 328 |  |  | 1 |  |  | 329 |  |  | USD |  |  |  |  |  | 2040 |  |  |  |  |  | 5.700 |
Eni USA Inc | 375 |  |  |  |  |  | 375 |  |  | USD |  |  |  |  |  | 2027 |  |  |  |  |  | 7.300 |
PLT Wind 2022 SpA | 18 |  |  |  |  |  | 18 |  |  | EUR |  |  |  |  |  | 2031 |  |  |  |  |  | variable |
SEF Srl | 10 |  |  |  |  |  | 10 |  |  | EUR |  |  |  |  |  | 2026 |  |  |  |  |  | 7.000 |
| 3,542 |  |  | 17 |  |  | 3,559 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| 18,376 |  |  | 136 |  |  | 18,512 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Bonds |
Disclosure of detailed information about borrowings [line items] |
Schedule of finance debt |
(€ million) | Amount |  |  | Discount on bond issue and accrued expense |  |  | Total |  |  | Currency |  |  | Maturity |  |  | Rate % |
Eni SpA | 1,000 |  |  | (2 | ) |  | 998 |  |  | EUR |  |  | 2028 |  |  | 0.375 |

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