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v3.22.1

Equity - Additional information (Details) |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |
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Dec. 31, 2021 EUR (€) shares | Jul. 29, 2021 EUR (€) € / shares | May 13, 2021 shares | May 12, 2021 EUR (€) € / shares | May 31, 2021 item | Dec. 31, 2021 EUR (€) instrument shares | Dec. 31, 2020 EUR (€) shares | Dec. 31, 2019 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 | € 4,005,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend per share to fully settle prior year dividend | € / shares |  |  |  | € 0.24 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends recognised as distributions to owners per share | € / shares |  |  |  | 0.36 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interim dividends paid per share relating to prior year | € / shares |  |  |  | € 0.12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of time from date of resolution to proceed with purchase of shares |  |  |  | 18 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ordinary shares authorized to be purchased |  |  |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of share capital authorized to be purchased |  |  |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of shares, maximum authorised amount |  |  |  | € 1,600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of treasury shares purchased | shares |  |  |  |  |  | 34,106,871 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of treasury shares |  |  |  |  |  | € 400,000,000 |  | € 400,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Interim dividend distribution of Eni SpA |  |  |  |  |  | 1,533,000,000 | 429,000,000 | € 1,542,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Costs for the issue of perpetual subordinated bonds |  |  |  |  |  | 15,000,000 | 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Other reserves | € 190,000,000 |  |  |  |  | € 190,000,000 | € 190,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of treasury shares | shares | 65,838,173 |  |  |  |  | 65,838,173 | 33,045,197 |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury shares | € 958,000,000 |  |  |  |  | € 958,000,000 | € 581,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury shares assigned | shares |  |  |  |  |  | 1,313,895 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributable reserves | 34,000,000,000 |  |  |  |  | € 34,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Monetary Incentive Plan 2020 - 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorised number of treasury shares to be disposed | shares |  |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interim dividend distribution of Eni SpA |  | € 1,533,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interim dividends paid per share | € / shares |  | € 0.43 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Perpetual subordinated bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of euro-denominated perpetual subordinated hybrid bonds issued |  |  |  |  | 2 | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Costs for the issue of perpetual subordinated bonds |  |  |  |  |  | € 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | 5,000,000,000 |  |  |  |  | 5,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Perpetual subordinated bond, one |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | € 1,500,000,000 |  |  |  |  | € 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of the bonds | 5 years 3 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reoffer price (as a percent) | 99.403% |  |  |  |  | 99.403% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual fixed coupon (as a percent) | 2.625% |  |  |  |  | 2.625% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Perpetual subordinated bond, one | Five Year Euro Mid Swap Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial spread on variable rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.167%
Additional spread on variable rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 0.75% |  |  |  | 0.25% |  |  |  |
Perpetual subordinated bond, two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | € 1,500,000,000 |  |  |  |  | € 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of the bonds | 9 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reoffer price (as a percent) | 100.00% |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual fixed coupon (as a percent) | 3.375% |  |  |  |  | 3.375% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Perpetual subordinated bond, two | Five Year Euro Mid Swap Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial spread on variable rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.641% |  |
Additional spread on variable rate (as a percent) |  |  |  |  |  |  |  |  |  | 0.75% |  |  |  | 0.25% |  |  |  |  |  |
Perpetual subordinated bond three |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | € 1,000,000,000 |  |  |  |  | € 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of the bonds | 6 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reoffer price (as a percent) | 100.00% |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual fixed coupon (as a percent) | 2.00% |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Perpetual subordinated bond three | Five Year Euro Mid Swap Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial spread on variable rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.204% |
Additional spread on variable rate (as a percent) |  |  |  |  |  |  |  |  |  |  | 0.75% |  |  |  | 0.25% |  |  |  |  |
Perpetual subordinated bond four |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | € 1,000,000,000 |  |  |  |  | € 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of the bonds | 9 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reoffer price (as a percent) | 99.607% |  |  |  |  | 99.607% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual fixed coupon (as a percent) | 2.75% |  |  |  |  | 2.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Perpetual subordinated bond four | Five Year Euro Mid Swap Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial spread on variable rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.771% |  |  |
Additional spread on variable rate (as a percent) |  |  |  |  |  |  |  |  | 0.75% |  |  |  | 0.25% |  |  |  |  |  |  |
Merger reserve |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other reserves | € 127,000,000 |  |  |  |  | € 127,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
ENI SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital | € 4,005,358,876 |  |  |  |  | € 4,005,358,876 | € 4,005,358,876 |  |  |  |  |  |  |  |  |  |  |  |  |
ENI SpA | Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued | shares | 3,605,594,848 |  |  |  |  | 3,605,594,848 | 3,605,594,848 |  |  |  |  |  |  |  |  |  |  |  |  |

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