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Property, plant and equipment (Tables) | 12 Months Ended
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Dec. 31, 2022
Property, plant and equipment |
Schedule of property, plant and equipment |
(€ million) |  | Land and buildings |  |  | E&P wells, plant and machinery |  |  | Other plant and machinery |  |  | E&P exploration assets and appraisal |  |  | E&P tangible assets in progress |  |  | Other tangible assets in progress and advances |  |  | Total |
2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net carrying amount - beginning of the year |  | 1,071 |  |  | 42,342 |  |  | 3,850 |  |  | 1,244 |  |  | 6,545 |  |  | 1,247 |  |  | 56,299 |
Additions |  | 22 |  |  | 132 |  |  | 456 |  |  | 655 |  |  | 5,471 |  |  | 964 |  |  | 7,700 |
Depreciation capitalized |  |  |  |  |  |  |  |  |  |  | 11 |  |  | 179 |  |  |  |  |  | 190 |
Depreciation (*) |  | (51 | ) |  | (5,467 | ) |  | (554 | ) |  |  |  |  |  |  |  |  |  |  | (6,072 | )
Reversals |  | 3 |  |  | 40 |  |  | 191 |  |  |  |  |  | 141 |  |  | 38 |  |  | 413 |
Impairments |  | (21 | ) |  | (313 | ) |  | (485 | ) |  |  |  |  | (149 | ) |  | (414 | ) |  | (1,382 | )
Write-off |  | (1 | ) |  |  |  |  | (2) |  |  | (365 | ) |  | (218 | ) |  |  |  |  | (586 | )
Currency translation differences |  | 2 |  |  | 2,422 |  |  | 55 |  |  | 74 |  |  | 364 |  |  | 9 |  |  | 2,926 |
Initial recognition and changes in estimates |  |  |  |  | (173 | ) |  | 2 |  |  | (7 | ) |  | 98 |  |  |  |  |  | (80 | )
Changes in the scope of consolidation - included entities |  | 9 |  |  | 650 |  |  | 695 |  |  |  |  |  |  |  |  | 118 |  |  | 1,472 |
Changes in the scope of consolidation - excluded entities |  | (1 | ) |  | (3,687 | ) |  | (6 | ) |  | (119 | ) |  | (546 | ) |  |  |  |  | (4,359 | )
Transfers |  | 41 |  |  | 4,403 |  |  | 425 |  |  | (149 | ) |  | (4,254 | ) |  | (466 | ) |  |  |
Other changes |  | 14 |  |  | 143 |  |  | (347 | ) |  | 1 |  |  | (4 | ) |  | 4 |  |  | (189 | )
Net carrying amount - end of the year |  | 1,088 |  |  | 40,492 |  |  | 4,280 |  |  | 1,345 |  |  | 7,627 |  |  | 1,500 |  |  | 56,332 |
Gross carrying amount - end of the year |  | 4,255 |  |  | 143,433 |  |  | 31,327 |  |  | 1,345 |  |  | 11,787 |  |  | 3,665 |  |  | 195,812 |
Provisions for depreciation and impairments |  | 3,167 |  |  | 102,941 |  |  | 27,047 |  |  |  |  |  | 4,160 |  |  | 2,165 |  |  | 139,480 |
2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net carrying amount - beginning of the year |  | 1,128 |  |  | 39,648 |  |  | 3,299 |  |  | 1,341 |  |  | 7,118 |  |  | 1,409 |  |  | 53,943 |
Additions |  | 18 |  |  | 8 |  |  | 277 |  |  | 380 |  |  | 3,413 |  |  | 854 |  |  | 4,950 |
Depreciation capitalized |  |  |  |  |  |  |  |  |  |  | 28 |  |  | 90 |  |  |  |  |  | 118 |
Depreciation (*) |  | (49 | ) |  | (5,421 | ) |  | (496 | ) |  |  |  |  |  |  |  |  |  |  | (5,966 | )
Reversals |  |  |  |  | 1,080 |  |  | 118 |  |  |  |  |  | 337 |  |  |  |  |  | 1,535 |
Impairments |  | (101 | ) |  | (90 | ) |  | (768 | ) |  |  |  |  | (85 | ) |  | (582 | ) |  | (1,626 | )
Write-off |  | (1 | ) |  |  |  |  | (2 | ) |  | (331 | ) |  | (18 | ) |  |  |  |  | (352 | )
Currency translation differences |  | 2 |  |  | 2,956 |  |  | 66 |  |  | 106 |  |  | 546 |  |  | 12 |  |  | 3,688 |
Initial recognition and changes in estimates |  |  |  |  | 200 |  |  |  |  |  | (9 | ) |  | 4 |  |  |  |  |  | 195 |
Changes in the scope of consolidation |  | 22 |  |  |  |  |  | 1,001 |  |  | (199 | ) |  | (1,119 | ) |  | 43 |  |  | (252 | )
Transfers |  | 50 |  |  | 3,841 |  |  | 409 |  |  | (44 | ) |  | (3,797 | ) |  | (459 | ) |  |  |
Other changes |  | 2 |  |  | 120 |  |  | (54 | ) |  | (28 | ) |  | 56 |  |  | (30 | ) |  | 66 |
Net carrying amount - end of the year |  | 1,071 |  |  | 42,342 |  |  | 3,850 |  |  | 1,244 |  |  | 6,545 |  |  | 1,247 |  |  | 56,299 |
Gross carrying amount - end of the year |  | 4,175 |  |  | 149,117 |  |  | 30,618 |  |  | 1,244 |  |  | 10,485 |  |  | 3,107 |  |  | 198,746 |
Provisions for depreciation and impairments |  | 3,104 |  |  | 106,775 |  |  | 26,768 |  |  |  |  |  | 3,940 |  |  | 1,860 |  |  | 142,447 |
(*) Before capitalization of depreciation of tangible assets
Schedule of depreciation rates |
(%) |  |
Buildings | 2 - 10 |
Refining and chemical plants | 3 - 17 |
Gas pipelines and compression stations | 4 - 12 |
Power plants | 3 - 5 |
Other plant and machinery | 6 - 12 |
Industrial and commercial equipment | 5 - 25 |
Other assets | 10 - 20 |
Schedule of stratification of the suspended wells pending final determination of proved reserves aging |
(€ million) | 2022 |  |  | 2021 |  |  | 2020 |
Costs for exploratory wells suspended - beginning of the year | 1,101 |  |  | 1,268 |  |  | 1,246 |
Increases for which is ongoing the determination of proved reserves | 547 |  |  | 288 |  |  | 408 |
Amounts previously capitalized and expensed in the year | (374 | ) |  | (286 | ) |  | (226 | )
Reclassification to successful exploratory wells following the estimation of proved reserves | (147 | ) |  | (43 | ) |  | (48 | )
Disposals | (2 | ) |  | (3 | ) |  |  |
Changes in the scope of consolidation | (114 | ) |  | (199 | ) |  |  |
Currency translation differences | 65 |  |  | 100 |  |  | (112 | )
Other changes | 9 |  |  | (24 | ) |  |  |
Costs for exploratory wells suspended - end of the year | 1,085 |  |  | 1,101 |  |  | 1,268 |
The following information relates to the stratification of the suspended wells pending final determination (age ing):
| 2022 |  |  | 2021 |  |  | 2020 |
| (€ million) |  |  | (number of wells in Eni’s interest) |  |  | (€ million) |  |  | (number of wells in Eni’s interest) |  |  | (€ million) |  |  | (number of wells in Eni’s interest) |
Costs capitalized and suspended for exploratory well activity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
- within 1 year | 216 |  |  | 5.0 |  |  | 175 |  |  | 4.0 |  |  | 157 |  |  | 6.7 |
- between 1 and 3 years | 246 |  |  | 4.9 |  |  | 269 |  |  | 12.2 |  |  | 250 |  |  | 11.0 |
- beyond 3 years | 623 |  |  | 13.9 |  |  | 657 |  |  | 19.7 |  |  | 861 |  |  | 19.3 |
| 1,085 |  |  | 23.8 |  |  | 1,101 |  |  | 35.9 |  |  | 1,268 |  |  | 37.0 |
Costs capitalized for suspended wells |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
- fields including wells drilled over the last 12 months | 204 |  |  | 4.5 |  |  | 175 |  |  | 4.0 |  |  | 157 |  |  | 6.7 |
- fields for which the delineation campaign is in progress | 579 |  |  | 11.3 |  |  | 567 |  |  | 17.9 |  |  | 631 |  |  | 14.9 |
- fields including commercial discoveries that proceeds to a FID | 302 |  |  | 8.0 |  |  | 359 |  |  | 14.0 |  |  | 480 |  |  | 15.4 |
| 1,085 |  |  | 23.8 |  |  | 1,101 |  |  | 35.9 |  |  | 1,268 |  |  | 37.0 |
Schedule of unproved mineral interests |
(€ million) | Congo |  |  | Nigeria |  |  | Turkmenistan |  |  | USA |  |  | Algeria |  |  | Egypt |  |  | United Arab Emirates |  |  | Italy |  |  | Total |
2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount - beginning of the year | 218 |  |  | 892 |  |  | 3 |  |  | 68 |  |  | 114 |  |  | 16 |  |  | 508 |  |  |  |  |  | 1,819 |
Additions |  |  |  | 11 |  |  |  |  |  |  |  |  | 110 |  |  | (2 | ) |  |  |  |  | 2 |  |  | 121 |
Net (impairments) reversals | (28 | ) |  |  |  |  | 93 |  |  | (56 | ) |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 |
Reclassification to Proved Mineral Interest | (6 | ) |  |  |  |  |  |  |  |  |  |  | (19 | ) |  | (12 | ) |  | (19 | ) |  |  |  |  | (56 | )
Currency translation differences | 14 |  |  | 55 |  |  | (1 | ) |  | 4 |  |  | 6 |  |  | 1 |  |  | 31 |  |  |  |  |  | 110 |
Carrying amount - end of the year | 198 |  |  | 958 |  |  | 95 |  |  | 16 |  |  | 211 |  |  | 3 |  |  | 520 |  |  | 2 |  |  | 2,003 |
2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount - beginning of the year | 203 |  |  | 860 |  |  |  |  |  | 114 |  |  | 100 |  |  | 18 |  |  | 468 |  |  |  |  |  | 1,763 |
Additions |  |  |  |  |  |  |  |  |  | 3 |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  | 9 |
Net (impairments) reversals | (1 | ) |  |  |  |  | 3 |  |  | 35 |  |  |  |  |  | (2 | ) |  |  |  |  |  |  |  | 35 |
Reclassification to Proved Mineral Interest |  |  |  | (48 | ) |  |  |  |  | (92 | ) |  |  |  |  | (1 | ) |  |  |  |  |  |  |  | (141 | )
Currency translation differences | 16 |  |  | 80 |  |  |  |  |  | 8 |  |  | 8 |  |  | 1 |  |  | 40 |  |  |  |  |  | 153 |
Carrying amount - end of the year | 218 |  |  | 892 |  |  | 3 |  |  | 68 |  |  | 114 |  |  | 16 |  |  | 508 |  |  |  |  |  | 1,819 |

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