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Property, plant and equipment (Tables) | 12 Months Ended
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Dec. 31, 2021
Property, plant and equipment |
Schedule of property, plant and equipment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Other tangible | ​ | ​
​ | ​ | ​ | ​ | E&P wells, | ​ | ​ | ​ | E&P exploration | ​ | E&P tangible | ​ | assets in | ​ | ​
​ | ​ | Land and | ​ | plant and | ​ | Other plant | ​ | assets and | ​ | assets in | ​ | progress and | ​ | ​
(€ million) |  | buildings |  | machinery |  | and machinery |  | appraisal |  | progress |  | advances |  | Total
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
Impairment |  | (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
2020 |  |  |  | ​ |  | ​ |  | ​ |  |  |  |  |  |
Net carrying amount - beginning of the year |  | 1,218 |  | 46,492 |  | 3,632 |  | 1,563 |  | 7,412 |  | 1,875 |  | 62,192
Additions |  | 12 |  | 6 |  | 229 |  | 265 |  | 3,127 |  | 768 |  | 4,407
Depreciation capitalized | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 4 | ​ | 100 | ​ | ​ | ​ | 104
Depreciation (*) |  | (55) |  | (5,642) |  | (508) |  | ​ |  | ​ |  | ​ |  | (6,205)
Reversals |  | 13 |  | 183 |  | 342 |  | ​ |  | 98 |  | 12 |  | 648
Impairment |  | (82) |  | (1,551) |  | (972) |  | ​ |  | (567) |  | (582) |  | (3,754)
Write-off |  | ​ |  | ​ |  | (1) |  | (296) |  | (7) |  | (1) |  | (305)
Currency translation differences |  | (2) |  | (3,325) |  | (75) |  | (119) |  | (605) |  | (14) |  | (4,140)
Initial recognition and changes in estimates | ​ | ​ | ​ | 870 | ​ | ​ | ​ | (9) | ​ | 94 | ​ | ​ | ​ | 955
Transfers |  | 39 |  | 2,677 |  | 755 |  | (47) |  | (2,630) |  | (794) |  | ​
Other changes |  | (15) |  | (62) |  | (103) |  | (20) |  | 96 |  | 145 |  | 41
Net carrying amount - end of the year |  | 1,128 |  | 39,648 |  | 3,299 |  | 1,341 |  | 7,118 |  | 1,409 |  | 53,943
Gross carrying amount - end of the year |  | 4,082 |  | 136,468 |  | 28,839 |  | 1,341 |  | 11,169 |  | 2,742 |  | 184,641
Provisions for depreciation and impairments |  | 2,954 |  | 96,820 |  | 25,540 |  | ​ |  | 4,051 |  | 1,333 |  | 130,698
​ (*)Before capitalization of depreciation of tangible assets
Schedule of depreciation rates | The main depreciation rates used were substantially unchanged from the previous year and ranged as follows: ​
​ | ​ | ​
(%) |  | ​
Buildings |  | 2–10
Mineral exploration wells and plants |  | UOP
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) |  | 2021 |  | 2020 |  | 2019
Costs for exploratory wells suspended - beginning of the year |  | 1,268 |  | 1,246 |  | 1,101
Increases for which is ongoing the determination of proved reserves |  | 288 |  | 408 |  | 368
Amounts previously capitalized and expensed in the year |  | (286) |  | (226) |  | (183)
Reclassification to successful exploratory wells following the estimation of proved reserves |  | (43) |  | (48) |  | (46)
Disposals |  | (3) |  | ​ |  | (15)
Changes in the scope of consolidation |  | (199) |  | ​ |  | ​
Currency translation differences |  | 100 |  | (112) |  | 21
Other changes | ​ | (24) | ​ | ​ | ​ | ​
Costs for exploratory wells suspended - end of the year |  | 1,101 |  | 1,268 |  | 1,246
​ The following information relates to the stratification of the suspended wells pending final determination (ageing): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2021 |  | 2020 |  | 2019
​ | ​ | ​ | ​ | (number of | ​ | ​ | ​ | (number of | ​ | ​ | ​ | (number of
​ | ​ | ​ | ​ | wells in Eni’s | ​ | ​ | ​ | wells in Eni’s | ​ | ​ | ​ | wells in Eni’s
​ |  | (€ million) |  | interest) |  | (€ million) |  | interest) |  | (€ million) |  | interest)
Costs capitalized and suspended for exploratory well activity | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
- within 1 year |  | 175 |  | 4.0 |  | 157 |  | 6.7 |  | 185 |  | 7.7
- between 1 and 3 years |  | 269 |  | 12.2 |  | 250 |  | 11.0 |  | 171 |  | 6.4
- beyond 3 years |  | 657 |  | 19.7 |  | 861 |  | 19.3 |  | 890 |  | 26.4
​ |  | 1,101 |  | 35.9 |  | 1,268 |  | 37.0 |  | 1,246 |  | 40.5
Costs capitalized for suspended wells |  | ​ |  | ​ |  | ​ |  | ​ |  |  |  |
- fields including wells drilled over the last 12 months |  | 175 |  | 4.0 |  | 157 |  | 6.7 |  | 185 |  | 7.7
- fields for which the delineation campaign is in progress |  | 567 |  | 17.9 |  | 631 |  | 14.9 |  | 556 |  | 11.3
- fields including commercial discoveries that proceeds to sanctioning |  | 359 |  | 14.0 |  | 480 |  | 15.4 |  | 505 |  | 21.5
​ |  | 1,101 |  | 35.9 |  | 1,268 |  | 37.0 |  | 1,246 |  | 40.5
Schedule of unproved mineral interests | Unproved mineral interests, comprised in assets in progress of the Exploration & Production segment, include the purchase price allocated to unproved reserves following business combinations or acquisition of individual properties. Unproved mineral interests were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | United Arab | ​ | ​
(€ million) |  | Congo |  | Nigeria |  | Turkmenistan |  | USA |  | Algeria |  | Egypt |  | Emirates |  | Total
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
2020 |  | ​ |  | ​ |  | ​ |  | ​ |  | ​ |  | ​ |  | ​ |  | ​
Carrying amount - beginning of the year |  | 253 |  | 939 |  | 139 |  | 162 |  | 115 |  | 19 |  | 535 |  | 2,162
Additions |  | ​ |  | ​ |  | ​ |  | ​ |  | 55 |  | 2 |  | ​ |  | 57
Net (impairments) reversals |  | (25) |  | ​ |  | (134) |  | (37) |  | ​ |  | ​ |  | ​ |  | (196)
Reclassification to Proved Mineral Interest |  | ​ |  | ​ |  | (2) |  | ​ |  | (61) |  | (2) |  | (25) |  | (90)
Currency translation differences |  | (25) |  | (79) |  | (3) |  | (11) |  | (9) |  | (1) |  | (42) |  | (170)
Carrying amount - end of the year |  | 203 |  | 860 |  | ​ |  | 114 |  | 100 |  | 18 |  | 468 |  | 1,763

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