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Property, plant and equipment - Additional information (Details) € in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Feb. 28, 2023 NUMBER | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 EUR (€) | Dec. 31, 2021 EUR (€) | Dec. 31, 2020 EUR (€)
Property, plant and equipment |  |  |  |  |
Borrowing costs capitalised |  | € 94 | € 38 | € 68 |
Capital expenditure |  | 8,739 | 7,700 |  |
Expenditures to purchase plant and equipment from suppliers |  | 966 |  |  |
Currency translation differences |  | (1,578) | 2,926 |  |
Property, plant and equipment |  | 56,299 | 56,332 | 56,299 |
Property, plant and equipment, pledged as security |  | 24 |  |  |
Government grants |  | 91 | 115 |  |
Other changes |  | (686) | (189) |  |
Write-off |  | € 447 | 586 |  |
Risk-adjusted weighted average cost of capital (adjusted WACC) (in percent) |  | 7.00% |  |  |
Novamont group |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Changes in the scope of consolidation |  | € 255 |  |  |
Proportion of ownership interest in joint operation |  | 36.00% |  |  |
Property, plant and equipment subject to operating leases |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Property, plant and equipment |  | € 347 |  |  |
Accumulated impairment |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Property, plant and equipment |  | (22,650) | (21,715) |  |
US Dollars |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Currency translation differences |  | 1,572 |  |  |
Nigeria | Oando PLC |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Other changes |  | 914 |  |  |
Nigeria | Oil Prospecting License 245 |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Property, plant and equipment |  | € 1,208 |  |  |
Risk-adjusted weighted average cost of capital (adjusted WACC) (in percent) |  | 8.00% |  |  |
Algeria | BP business |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Changes in the scope of consolidation |  | € 548 |  |  |
Algeria | Eni In Amenas Ltd and Eni In Salah Ltd |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Number of gas producing concessions |  | 2 |  |  |
Congo |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Other changes |  | € 355 |  |  |
Unproved mineral interest |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Property, plant and equipment |  | 2,159 | 2,003 | 1,819 |
Net (impairments) reversals |  | (158) | (9) |  |
Unproved mineral interest | Oil Prospecting License 245 |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Property, plant and equipment |  | € 888 |  |  |
Unproved mineral interest | Oil Prospecting License 245 | Nigeria Government |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Proportion of ownership interest in joint operation |  | 50.00% |  |  |
E&P wells, plant and machinery |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Capital expenditure |  |  | 132 |  |
Currency translation differences |  | € (1,223) | 2,422 |  |
Property, plant and equipment |  | 37,421 | 40,492 | 42,342 |
Other changes |  | (1,905) | 143 |  |
E&P wells, plant and machinery | Ivory Coast, Italy, Congo, Egypt, Iraq, Mexico, United States and Algeria |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Transfers |  | 5,355 |  |  |
E&P exploration assets and appraisal |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Capital expenditure |  | 764 | 655 |  |
Currency translation differences |  | (46) | 74 |  |
Property, plant and equipment |  | 1,568 | 1,345 | 1,244 |
Other changes |  | (42) | 1 |  |
Write-off |  | 420 | 365 |  |
E&P exploration assets and appraisal | Egypt, Mexico, Mozambique, Morocco, United Arab Emirates and Lebanon [member] |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Write-off |  | 420 |  |  |
Suspended exploration wells pending final determination |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Currency translation differences |  | (40) | 65 | 100 |
Changes in the scope of consolidation |  |  | (114) | (199) |
Property, plant and equipment |  | 1,391 | 1,085 | 1,101 | € 1,268
Other changes |  | (25) | 9 | (24) |
Exploration wells in progress |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Property, plant and equipment |  | 177 |  |  |
Petrochemical plants [member] |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Net (impairments) reversals |  | 367 |  |  |
Oil and Gas properties [member] | Alaska, Gulf of Mexico, Turkmenistan, Italy and Australia |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Net (impairments) reversals |  | 1,025 |  |  |
Ganal PSC and Rapak PSC [member] | Eni Ganal Deepwater Ltd and Eni Rapak Deepwater Ltd |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Changes in the scope of consolidation |  | € 104 |  |  |
Ganal block [member] |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Percentage of interest in project |  | 20.00% |  |  |
Ganal block [member] | Eni Ganal Deepwater Ltd [Member] |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Percentage of voting equity interests acquired (in percent) |  | 62.00% |  |  |
Rapak block [member] |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Percentage of interest in project |  | 20.00% |  |  |
Rapak block [member] | Eni Rapak Deepwater Ltd [Member] |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Percentage of voting equity interests acquired (in percent) |  | 62.00% |  |  |
Makassar block [member] | Eni Makassar Ltd [Member] |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Percentage of voting equity interests acquired (in percent) |  | 72.00% |  |  |
Exploration & Production |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Borrowing costs capitalised |  | € 64 | € 22 |  |
Average Interest rate used for capitalizing finance expense |  | 3.00% | 2.10% |  |
Capital expenditure |  | € 7,105 | € 6,185 |  |
Exploration & Production | Algeria | BP business |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Number of gas producing concessions | NUMBER | 2 |  |  |  |
Plenitude | HLS Bonete PV SLU and HLS Bonete Topco SLU |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Changes in the scope of consolidation |  | 168 |  |  |
Cash-generating units [member] | Enilive, Refining and Chemicals |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Net (impairments) reversals |  | 345 |  |  |
fields including commercial discoveries that proceeds to sanctioning | Suspended exploration wells pending final determination |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Property, plant and equipment |  | € 170 | € 302 | € 359 |

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