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v3.24.1

Equity - Additional information (Details) |  | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |
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May 10, 2023 EUR (€) NUMBER € / shares shares | Dec. 31, 2023 EUR (€) shares | Dec. 31, 2022 EUR (€) shares | Dec. 31, 2021 EUR (€) | May 11, 2050 | Oct. 13, 2049 | May 11, 2047 | Jan. 13, 2046 | May 11, 2035 | Oct. 13, 2034 | May 11, 2032 | Jan. 13, 2031 | May 11, 2030 | Oct. 13, 2029 | May 11, 2027 | Jan. 13, 2026
Share capital |  | € 4,005,000,000 | € 4,005,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends recognised as distributions to owners per share | € / shares | € 0.94 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of treasury shares cancelled | shares | 195,550,084 | 195,550,084 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction of the related reserve due to cancellation of treasury shares | € 2,400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of shares, maximum authorised amount | € 3,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of treasury shares purchased | shares |  | 128,894,264 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of treasury shares |  | € 1,837,000,000 | 2,400,000,000 | € 400,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Interim dividend distribution of Eni SpA |  |  | 1,500,000,000 | 1,533,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Costs for the issue of perpetual subordinated bonds |  |  |  | € 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Other reserves |  |  | 190,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of treasury shares | shares |  | 128,894,264 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury shares |  | € 2,333,000,000 | 2,937,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Cancellation of treasury shares |  | € 2,400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury shares assigned | shares |  | 2,326,678 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributable reserves |  | € 43,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of tranches for dividend distributions | NUMBER | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorised for purchase of ordinary shares | shares | 337,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorised for purchase of ordinary shares for the purpose of remunerating shareholders | shares | 275,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorised for purchase of ordinary shares for setting up the so-called stock store | shares | 62,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Perpetual subordinated bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  | 5,000,000,000 | 5,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Perpetual subordinated bond, one |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  | € 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of the bonds |  | 5 years 3 months |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reoffer price (as a percent) |  | 99.403% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual fixed coupon (as a percent) |  | 2.625% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Perpetual subordinated bond, one | Five Year Euro Mid Swap Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial spread on variable rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 316.70%
Additional spread on variable rate (as a percent) |  |  |  |  |  |  |  | 75.00% |  |  |  | 25.00% |  |  |  |
Perpetual subordinated bond, two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  | € 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of the bonds |  | 9 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reoffer price (as a percent) |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual fixed coupon (as a percent) |  | 3.375% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Perpetual subordinated bond, two | Five Year Euro Mid Swap Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial spread on variable rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 364.10% |  |
Additional spread on variable rate (as a percent) |  |  |  |  |  | 75.00% |  |  |  | 25.00% |  |  |  |  |  |
Perpetual subordinated bond three |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  | € 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of the bonds |  | 6 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reoffer price (as a percent) |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual fixed coupon (as a percent) |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Perpetual subordinated bond three | Five Year Euro Mid Swap Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial spread on variable rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 220.40% |
Additional spread on variable rate (as a percent) |  |  |  |  |  |  | 75.00% |  |  |  | 25.00% |  |  |  |  |
Perpetual subordinated bond four |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  | € 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of the bonds |  | 9 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reoffer price (as a percent) |  | 99.607% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual fixed coupon (as a percent) |  | 2.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Perpetual subordinated bond four | Five Year Euro Mid Swap Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial spread on variable rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 277.10% |  |  |
Additional spread on variable rate (as a percent) |  |  |  |  | 75.00% |  |  |  | 25.00% |  |  |  |  |  |  |
September 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends recognised as distributions to owners per share | € / shares | € 0.24 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
November 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends recognised as distributions to owners per share | € / shares | 0.23 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
March 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends recognised as distributions to owners per share | € / shares | 0.24 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
May 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends recognised as distributions to owners per share | € / shares | € 0.23 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ENI SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital |  | € 4,005,358,876 | € 4,005,358,876 |  |  |  |  |  |  |  |  |  |  |  |  |
ENI SpA | Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued | shares |  | 3,375,937,893 | 3,571,487,977 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of treasury shares | shares |  | 157,115,336 | 226,097,834 |  |  |  |  |  |  |  |  |  |  |  |  |

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