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Property, plant and equipment (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure Of Property Plant And Equipment Explanatory [Abstract] |
Disclosure of detailed information about property, plant and equipment [text block] |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 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 |
2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net carrying amount – beginning of the year |  |  | 1,313 |  |  |  | 45,782 |  |  |  | 3,877 |  |  |  | 1,371 |  |  |  | 9,469 |  |  |  | 1,346 |  |  |  | 63,158 |
Additions |  |  | 18 |  |  |  | 432 |  |  |  | 173 |  |  |  | 330 |  |  |  | 6,947 |  |  |  | 878 |  |  |  | 8,778 |
Depreciation |  |  | (65 | ) |  |  | (6,012 | ) |  |  | (529 | ) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (6,606 | )
Reversals |  |  | 41 |  |  |  | 299 |  |  |  | 86 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 426 |
Impairments |  |  | (61 | ) |  |  | (477 | ) |  |  | (73 | ) |  |  |  |  |  |  | (548 | ) |  |  | (117 | ) |  |  | (1,276 | )
Write-off |  |  |  |  |  |  | (12 | ) |  |  | (1 | ) |  |  | (66 | ) |  |  | (4 | ) |  |  | (1 | ) |  |  | (84 | )
Disposals |  |  | (2 | ) |  |  | (400 | ) |  |  | (9 | ) |  |  | (32 | ) |  |  | (198 | ) |  |  | 2 |  |  |  | (639 | )
Currency translation differences |  |  | 2 |  |  |  | 1,623 |  |  |  | 36 |  |  |  | 53 |  |  |  | 385 |  |  |  | (1 | ) |  |  | 2,098 |
Decrease through loss of control of subsidiary |  |  | 1 |  |  |  | (4,388 | ) |  |  | 32 |  |  |  | (58 | ) |  |  | (474 | ) |  |  | 10 |  |  |  | (4,877 | )
Transfers |  |  | 81 |  |  |  | 6,795 |  |  |  | 461 |  |  |  | (294 | ) |  |  | (6,501 | ) |  |  | (542 | ) |  |  |  |
Other changes |  |  | (54 | ) |  |  | (786 | ) |  |  | (152 | ) |  |  | (37 | ) |  |  | 119 |  |  |  | 234 |  |  |  | (676 | )
Net carrying amount – end of the year |  |  | 1,274 |  |  |  | 42,856 |  |  |  | 3,901 |  |  |  | 1,267 |  |  |  | 9,195 |  |  |  | 1,809 |  |  |  | 60,302 |
Gross carrying amount – end of the year |  |  | 4,060 |  |  |  | 135,467 |  |  |  | 27,516 |  |  |  | 1,267 |  |  |  | 12,559 |  |  |  | 2,415 |  |  |  | 183,284 |
Provisions for depreciation and impairments |  |  | 2,786 |  |  |  | 92,611 |  |  |  | 23,615 |  |  |  |  |  |  |  | 3,364 |  |  |  | 606 |  |  |  | 122,982 |
2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net carrying amount – beginning of the year |  |  | 1,258 |  |  |  | 47,090 |  |  |  | 3,789 |  |  |  | 1,905 |  |  |  | 15,135 |  |  |  | 1,616 |  |  |  | 70,793 |
Additions |  |  | 22 |  |  |  | 42 |  |  |  | 190 |  |  |  | 351 |  |  |  | 7,302 |  |  |  | 583 |  |  |  | 8,490 |
Depreciation |  |  | (71 | ) |  |  | (6,583 | ) |  |  | (545 | ) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (7,199 | )
Reversals |  |  | 5 |  |  |  | 608 |  |  |  | 273 |  |  |  |  |  |  |  | 169 |  |  |  |  |  |  |  | 1,055 |
Impairments |  |  | (2 | ) |  |  | (491 | ) |  |  | (83 | ) |  |  |  |  |  |  | (146 | ) |  |  | (126 | ) |  |  | (848 | )
Write-off |  |  |  |  |  |  | (3 | ) |  |  | (2 | ) |  |  | (232 | ) |  |  | (2 | ) |  |  |  |  |  |  | (239 | )
Disposals |  |  | (15 | ) |  |  | 3 |  |  |  | (6 | ) |  |  |  |  |  |  | (1,376 | ) |  |  | (54 | ) |  |  | (1,448 | )
Currency translation differences |  |  | (5 | ) |  |  | (5,155 | ) |  |  | (143 | ) |  |  | (193 | ) |  |  | (1,527 | ) |  |  | (2 | ) |  |  | (7,025 | )
Transfers |  |  | 84 |  |  |  | 9,940 |  |  |  | 629 |  |  |  | (265 | ) |  |  | (9,673 | ) |  |  | (715 | ) |  |  |  |
Other changes |  |  | 37 |  |  |  | 331 |  |  |  | (225 | ) |  |  | (195 | ) |  |  | (413 | ) |  |  | 44 |  |  |  | (421 | )
Net carrying amount – end of the year |  |  | 1,313 |  |  |  | 45,782 |  |  |  | 3,877 |  |  |  | 1,371 |  |  |  | 9,469 |  |  |  | 1,346 |  |  |  | 63,158 |
Gross carrying amount – end of the year |  |  | 4,061 |  |  |  | 137,223 |  |  |  | 26,746 |  |  |  | 1,371 |  |  |  | 12,315 |  |  |  | 2,061 |  |  |  | 183,777 |
Provisions for depreciation and impairments |  |  | 2,748 |  |  |  | 91,441 |  |  |  | 22,869 |  |  |  |  |  |  |  | 2,846 |  |  |  | 715 |  |  |  | 120,619 |
Disclosure Of Detailed Information About Depreciation Rates [text block] | 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 |  | 2 – 17 |
Gas pipelines and compression stations |  | 2 – 12 |
Power plants |  | 5 |
Other plant and machinery |  | 6 – 12 |
Industrial and commercial equipment |  | 5 – 25 |
Other assets |  | 10 – 20 |
Disclosure of detailed information about stratification of the suspended wells pending final determination of proved reserves aging [text block] |
(€ million) |  |  | 2018 |  |  | 2017 |  |  | 2016 |
Costs for exploratory wells suspended – beginning of the period |  |  |  |  | 1,263 |  |  |  |  |  | 1,684 |  |  |  |  |  | 1,737 |  |
Increases for which is ongoing the determination of proved reserves |  |  |  |  | 235 |  |  |  |  |  | 451 |  |  |  |  |  | 282 |  |
Amounts previously capitalized and expensed in the period |  |  |  |  | (61) |  |  |  |  |  | (217) |  |  |  |  |  | (109) |  |
Reclassification to successful exploratory wells following the estimation of proved reserves |  |  |  |  | (297) |  |  |  |  |  | (278) |  |  |  |  |  | (276) |  |
Disposals |  |  |  |  | (6) |  |  |  |  |  | (199) |  |  |  |  |  |  |  |
Decrease through loss of control of subsidiary |  |  |  |  | (58) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification to assets held for sale |  |  |  |  | (24) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Currency translation differences |  |  |  |  | 49 |  |  |  |  |  | (178) |  |  |  |  |  | 50 |  |
Costs for exploratory wells suspended – end of the period |  |  |  |  | 1,101 |  |  |  |  |  | 1,263 |  |  |  |  |  | 1,684 |  |
The following information relates to the stratification of the suspended wells pending final determination (ageing):
|  |  | 2018 |  |  | 2017 |  |  | 2016 |
|  |  | (€ 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 |  |  |  |  | 111 |  |  |  |  |  | 7.02 |  |  |  |  |  | 222 |  |  |  |  |  | 7.95 |  |  |  |  |  | 16 |  |  |  |  |  | 1.05 |  |
- between 1 and 3 years |  |  |  |  | 87 |  |  |  |  |  | 2.88 |  |  |  |  |  | 241 |  |  |  |  |  | 3.87 |  |  |  |  |  | 609 |  |  |  |  |  | 10.25 |  |
- beyond 3 years |  |  |  |  | 903 |  |  |  |  |  | 24.20 |  |  |  |  |  | 800 |  |  |  |  |  | 21.44 |  |  |  |  |  | 1,059 |  |  |  |  |  | 21.55 |  |
|  |  |  |  | 1,101 |  |  |  |  |  | 34.10 |  |  |  |  |  | 1,263 |  |  |  |  |  | 33.26 |  |  |  |  |  | 1,684 |  |  |  |  |  | 32.85 |  |
Costs capitalized for suspended wells |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
- fields including wells drilled over the last 12 months |  |  |  |  | 111 |  |  |  |  |  | 7.02 |  |  |  |  |  | 148 |  |  |  |  |  | 5.88 |  |  |  |  |  | 9 |  |  |  |  |  | 0.55 |  |
- fields for which the delineation campaign is in progress |  |  |  |  | 217 |  |  |  |  |  | 4.66 |  |  |  |  |  | 261 |  |  |  |  |  | 4.69 |  |  |  |  |  | 251 |  |  |  |  |  | 3.51 |  |
- fields including commercial discoveries that proceeds to sanctioning |  |  |  |  | 773 |  |  |  |  |  | 22.42 |  |  |  |  |  | 854 |  |  |  |  |  | 22.69 |  |  |  |  |  | 1,424 |  |  |  |  |  | 28.79 |  |
|  |  |  |  | 1,101 |  |  |  |  |  | 34.10 |  |  |  |  |  | 1,263 |  |  |  |  |  | 33.26 |  |  |  |  |  | 1,684 |  |  |  |  |  | 32.85 |  |
Disclosure Of Detailed Information About Unproved Mineral Interests [text block] | Unproved mineral interests include the purchase price allocated to unproved reserves following business combinations or acquisition of individual properties. Unproved mineral interests were as follows:
(€ million) |  |  | Congo |  |  | Nigeria |  |  | Turkmenistan |  |  | USA |  |  | Algeria |  |  | Egypt |  |  | United Arab Emirates |  |  | Total |
2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Book amount at the beginning of the year |  |  |  |  | 1,162 |  |  |  |  |  | 825 |  |  |  |  |  | 192 |  |  |  |  |  | 99 |  |  |  |  |  | 105 |  |  |  |  |  | 7 |  |  |  |  |  |  |  |  |  |  |  | 2,390 |  |
Additions |  |  |  |  | 26 |  |  |  |  |  | 56 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23 |  |  |  |  |  | 487 |  |  |  |  |  | 592 |  |
Net (impairments) reversals |  |  |  |  | (429) |  |  |  |  |  |  |  |  |  |  |  | (76) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (505) |  |
Reclassification to proved mineral interest |  |  |  |  | (32) |  |  |  |  |  |  |  |  |  |  |  | (44) |  |  |  |  |  |  |  |  |  |  |  | (32) |  |  |  |  |  | (2) |  |  |  |  |  |  |  |  |  |  |  | (110) |  |
Other changes and currency translation differences |  |  |  |  | 42 |  |  |  |  |  | 40 |  |  |  |  |  | 5 |  |  |  |  |  | 4 |  |  |  |  |  | 4 |  |  |  |  |  | 1 |  |  |  |  |  | 15 |  |  |  |  |  | 111 |  |
Book amount at the end of the year |  |  |  |  | 769 |  |  |  |  |  | 921 |  |  |  |  |  | 77 |  |  |  |  |  | 103 |  |  |  |  |  | 77 |  |  |  |  |  | 29 |  |  |  |  |  | 502 |  |  |  |  |  | 2,478 |  |
2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Book amount at the beginning of the year |  |  |  |  | 1,254 |  |  |  |  |  | 938 |  |  |  |  |  | 138 |  |  |  |  |  | 113 |  |  |  |  |  |  |  |  |  |  |  | 7 |  |  |  |  |  |  |  |  |  |  |  | 2,450 |  |
Additions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 112 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 112 |  |
Net (impairments) reversals |  |  |  |  | 72 |  |  |  |  |  |  |  |  |  |  |  | 75 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 147 |  |
Reclassification to proved mineral interest |  |  |  |  | (7) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (7) |  |
Other changes and currency translation differences |  |  |  |  | (157) |  |  |  |  |  | (113) |  |  |  |  |  | (21) |  |  |  |  |  | (14) |  |  |  |  |  | (7) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (312) |  |
Book amount at the end of the year |  |  |  |  | 1,162 |  |  |  |  |  | 825 |  |  |  |  |  | 192 |  |  |  |  |  | 99 |  |  |  |  |  | 105 |  |  |  |  |  | 7 |  |  |  |  |  |  |  |  |  |  |  | 2,390 |  |

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- Definition The disclosure of detailed information about stratification of the suspended wells pending final determination of proved reserves (aging) and the projects to which they relate. + References No definition available. + Details
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- Definition The disclosure of detailed information about property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 73 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73&doctype=Standard -URIDate 2018-03-16 + Details
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