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Right-of-use assets and lease liabilities (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Right-of-use assets |  |  |
Net carrying amount - beginning of period | € 4,446 | € 4,821 |
Additions | 1,584 | 2,404 |
Depreciation | (973) | (1,013) | € (928)
Impairment | (41) | (18) | (59)
Reversals | 5 | 14 |
Currency translation differences | (89) | 267 |
Changes in the scope of consolidation | 13 | (1,879) |
Other changes | (111) | (150) |
Net carrying amount - end of period | 4,834 | 4,446 | 4,821
Lessee's exposure arising from options for extension or termination of lease for office buildings | 1,177 |  |
Lessee's exposure arising from extension options related to service stations for sale of oil products | 133 |  |
Exploration & Production |  |  |
Right-of-use assets |  |  |
Net carrying amount - beginning of period | 2,653 |  |
Additions | 1,023 |  |
Net carrying amount - end of period | 2,959 | € 2,653 |
Exploration & Production | Ghana and Angola | Minimum |  |  |
Right-of-use assets |  |  |
Lease, term of contract |  | 13 years |
Exploration & Production | Ghana and Angola | Maximum |  |  |
Right-of-use assets |  |  |
Lease, term of contract |  | 17 years |
Enilive, Refining and Chemicals [member] |  |  |
Right-of-use assets |  |  |
Net carrying amount - beginning of period | 800 |  |
Additions | 408 |  |
Net carrying amount - end of period | 965 | € 800 |
Corporate and Other activities |  |  |
Right-of-use assets |  |  |
Net carrying amount - beginning of period | 548 |  |
Additions | 63 |  |
Net carrying amount - end of period | 519 | 548 |
Upstream business |  |  |
Right-of-use assets |  |  |
Lessee's exposure arising from other extension options related to ancillary assets | 545 |  |
Floating production storage and offloading vessels (FPSO) |  |  |
Right-of-use assets |  |  |
Net carrying amount - beginning of period | 2,142 | 2,667 |
Additions | 14 | 1,342 |
Depreciation | (145) | (226) |
Currency translation differences | (71) | 239 |
Changes in the scope of consolidation |  | (1,878) |
Other changes | 37 | (2) |
Net carrying amount - end of period | 1,977 | 2,142 | 2,667
Drilling rig |  |  |
Right-of-use assets |  |  |
Net carrying amount - beginning of period | 148 | 183 |
Additions | 570 | 189 |
Depreciation | (219) | (197) |
Currency translation differences | (8) | 12 |
Changes in the scope of consolidation |  | (34) |
Other changes | (42) | (5) |
Net carrying amount - end of period | 449 | 148 | 183
Drilling rig | Exploration & Production |  |  |
Right-of-use assets |  |  |
Additions | 570 |  |
Naval facilities and related logistic bases for oil and gas transportation |  |  |
Right-of-use assets |  |  |
Net carrying amount - beginning of period | 682 | 575 |
Additions | 402 | 530 |
Depreciation | (315) | (303) |
Impairment | (3) | (5) |
Reversals | 3 | 14 |
Currency translation differences | (5) | 10 |
Changes in the scope of consolidation |  | (39) |
Other changes | (40) | (100) |
Net carrying amount - end of period | 724 | 682 | 575
Motorway concessions and service stations |  |  |
Right-of-use assets |  |  |
Net carrying amount - beginning of period | 457 | 454 |
Additions | 133 | 76 |
Depreciation | (74) | (70) |
Currency translation differences | 4 | 3 |
Other changes | (28) | (6) |
Net carrying amount - end of period | 492 | 457 | 454
Motorway concessions and service stations | Enilive, Refining and Chemicals [member] |  |  |
Right-of-use assets |  |  |
Additions | 146 |  |
Oil and gas distribution facilities |  |  |
Right-of-use assets |  |  |
Net carrying amount - beginning of period | 19 | 14 |
Additions | 19 | 28 |
Depreciation | (18) | (13) |
Impairment | (2) | (5) |
Other changes | (1) | (5) |
Net carrying amount - end of period | 17 | 19 | 14
Oil and gas distribution facilities | Exploration & Production |  |  |
Right-of-use assets |  |  |
Additions | 167 |  |
Office buildings |  |  |
Right-of-use assets |  |  |
Net carrying amount - beginning of period | 595 | 618 |
Additions | 110 | 108 |
Depreciation | (125) | (130) |
Currency translation differences | (2) | 3 |
Changes in the scope of consolidation | 3 | (1) |
Other changes | (1) | (3) |
Net carrying amount - end of period | 580 | 595 | 618
Lease commitment, nominal value | € 437 |  |
Lease commitment, term of contract | 20 years |  |
Lease commitment, extension option | 6 years |  |
Vehicles |  |  |
Right-of-use assets |  |  |
Net carrying amount - beginning of period | € 42 | 48 |
Additions | 14 | 21 |
Depreciation | (12) | (21) |
Impairment |  | (1) |
Other changes | (27) | (5) |
Net carrying amount - end of period | 17 | 42 | 48
Other |  |  |
Right-of-use assets |  |  |
Net carrying amount - beginning of period | 361 | 262 |
Additions | 322 | 110 |
Depreciation | (65) | (53) |
Impairment | (36) | (7) |
Reversals | 2 |  |
Currency translation differences | (7) |  |
Changes in the scope of consolidation | 10 | 73 |
Other changes | (9) | (24) |
Net carrying amount - end of period | 578 | 361 | € 262
Vessels |  |  |
Right-of-use assets |  |  |
Lease commitment, nominal value | 131 |  |
Vessels | Enilive, Refining and Chemicals [member] |  |  |
Right-of-use assets |  |  |
Additions | 220 |  |
Assets for staff activities | Corporate and Other activities |  |  |
Right-of-use assets |  |  |
Additions | 44 |  |
Gross carrying amount |  |  |
Right-of-use assets |  |  |
Net carrying amount - beginning of period | 6,862 |  |
Net carrying amount - end of period | 7,802 | 6,862 |
Gross carrying amount | Floating production storage and offloading vessels (FPSO) |  |  |
Right-of-use assets |  |  |
Net carrying amount - beginning of period | 2,507 |  |
Net carrying amount - end of period | 2,409 | 2,507 |
Gross carrying amount | Drilling rig |  |  |
Right-of-use assets |  |  |
Net carrying amount - beginning of period | 516 |  |
Net carrying amount - end of period | 985 | 516 |
Gross carrying amount | Naval facilities and related logistic bases for oil and gas transportation |  |  |
Right-of-use assets |  |  |
Net carrying amount - beginning of period | 1,360 |  |
Net carrying amount - end of period | 1,593 | 1,360 |
Gross carrying amount | Motorway concessions and service stations |  |  |
Right-of-use assets |  |  |
Net carrying amount - beginning of period | 734 |  |
Net carrying amount - end of period | 822 | 734 |
Gross carrying amount | Oil and gas distribution facilities |  |  |
Right-of-use assets |  |  |
Net carrying amount - beginning of period | 87 |  |
Net carrying amount - end of period | 81 | 87 |
Gross carrying amount | Office buildings |  |  |
Right-of-use assets |  |  |
Net carrying amount - beginning of period | 1,010 |  |
Net carrying amount - end of period | 1,039 | 1,010 |
Gross carrying amount | Vehicles |  |  |
Right-of-use assets |  |  |
Net carrying amount - beginning of period | 86 |  |
Net carrying amount - end of period | 47 | 86 |
Gross carrying amount | Other |  |  |
Right-of-use assets |  |  |
Net carrying amount - beginning of period | 562 |  |
Net carrying amount - end of period | 826 | 562 |
Provisions for depreciation and impairment |  |  |
Right-of-use assets |  |  |
Net carrying amount - beginning of period | (2,416) |  |
Net carrying amount - end of period | (2,968) | (2,416) |
Provisions for depreciation and impairment | Floating production storage and offloading vessels (FPSO) |  |  |
Right-of-use assets |  |  |
Net carrying amount - beginning of period | (365) |  |
Net carrying amount - end of period | (432) | (365) |
Provisions for depreciation and impairment | Drilling rig |  |  |
Right-of-use assets |  |  |
Net carrying amount - beginning of period | (368) |  |
Net carrying amount - end of period | (536) | (368) |
Provisions for depreciation and impairment | Naval facilities and related logistic bases for oil and gas transportation |  |  |
Right-of-use assets |  |  |
Net carrying amount - beginning of period | (678) |  |
Net carrying amount - end of period | (869) | (678) |
Provisions for depreciation and impairment | Motorway concessions and service stations |  |  |
Right-of-use assets |  |  |
Net carrying amount - beginning of period | (277) |  |
Net carrying amount - end of period | (330) | (277) |
Provisions for depreciation and impairment | Oil and gas distribution facilities |  |  |
Right-of-use assets |  |  |
Net carrying amount - beginning of period | (68) |  |
Net carrying amount - end of period | (64) | (68) |
Provisions for depreciation and impairment | Office buildings |  |  |
Right-of-use assets |  |  |
Net carrying amount - beginning of period | (415) |  |
Net carrying amount - end of period | (459) | (415) |
Provisions for depreciation and impairment | Vehicles |  |  |
Right-of-use assets |  |  |
Net carrying amount - beginning of period | (44) |  |
Net carrying amount - end of period | (30) | (44) |
Provisions for depreciation and impairment | Other |  |  |
Right-of-use assets |  |  |
Net carrying amount - beginning of period | (201) |  |
Net carrying amount - end of period | € (248) | € (201) |

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- Definition The increase (decrease) in right-of-use assets resulting from change in the scope of consolidation. + References No definition available. + Details
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- Definition The amount of impairment loss recognized in profit or loss for right-of-use assets. Always reported positively in XBRL. + References No definition available. + Details
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- Definition The increase (decrease) in right-of-use assets resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. + References No definition available. + Details
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- Definition The increase (decrease) in right-of-use assets resulting from changes that the entity does not separately disclose in the same statement or note. + References No definition available. + Details
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- Definition Amount of future cash outflows potentially due not reflected in the measurements of lease liabilities due to options for the extension or termination of the lease. + References No definition available. + Details
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- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term that do not meet the definition of investment property. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2023-01-01 -Paragraph 53 -Subparagraph j -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_53_j&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2023-01-01 -Paragraph 47 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_47_a&doctype=Standard -URIDate 2023-03-23 + Details
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