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Property, plant and equipment (Tables) | 12 Months Ended
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Dec. 31, 2017
Property Plant And Equipment |
Disclosure of detailed information about property, plant and equipment [text block] |
(€ million) |  | Land |  | Buildings |  | Plant and machinery |  | Industrial and commercial equipment |  | Other assets |  | Tangible assets in progress and advances |  | Total
2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net book amount at the beginning of the year |  |  | 448 |  |  |  | 810 |  |  |  | 50,270 |  |  |  | 300 |  |  |  | 309 |  |  |  | 18,656 |  |  |  | 70,793 |
Additions |  |  | 2 |  |  |  | 20 |  |  |  | 153 |  |  |  | 27 |  |  |  | 52 |  |  |  | 8,236 |  |  |  | 8,490 |
Depreciation |  |  |  |  |  |  | (71 | ) |  |  | (6,996 | ) |  |  | (63 | ) |  |  | (69 | ) |  |  |  |  |  |  | (7,199 | )
Net (impairments) reversals |  |  | (5 | ) |  |  | (5 | ) |  |  | 436 |  |  |  | (1 | ) |  |  | (5 | ) |  |  | (213 | ) |  |  | 207 |
Disposals |  |  | (12 | ) |  |  | (3 | ) |  |  | 3 |  |  |  |  |  |  |  | (6 | ) |  |  | (1,430 | ) |  |  | (1,448 | )
Write-off |  |  |  |  |  |  |  |  |  |  | (3 | ) |  |  | (2 | ) |  |  |  |  |  |  | (234 | ) |  |  | (239 | )
Currency translation differences |  |  | (2 | ) |  |  | (3 | ) |  |  | (5,272 | ) |  |  | (8 | ) |  |  | (18 | ) |  |  | (1,722 | ) |  |  | (7,025 | )
Other changes |  |  | 47 |  |  |  | 87 |  |  |  | 10,571 |  |  |  | (17 | ) |  |  | (2 | ) |  |  | (11,107 | ) |  |  | (421 | )
Net book amount at the end of the year |  |  | 478 |  |  |  | 835 |  |  |  | 49,162 |  |  |  | 236 |  |  |  | 261 |  |  |  | 12,186 |  |  |  | 63,158 |
Gross book amount at the end of the year |  |  | 571 |  |  |  | 3,490 |  |  |  | 160,751 |  |  |  | 1,264 |  |  |  | 1,954 |  |  |  | 15,747 |  |  |  | 183,777 |
Provisions for depreciation and impairments |  |  | 93 |  |  |  | 2,655 |  |  |  | 111,589 |  |  |  | 1,028 |  |  |  | 1,693 |  |  |  | 3,561 |  |  |  | 120,619 |
2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net book amount at the beginning of the year |  |  | 510 |  |  |  | 818 |  |  |  | 40,667 |  |  |  | 326 |  |  |  | 403 |  |  |  | 25,281 |  |  |  | 68,005 |
Additions |  |  | 1 |  |  |  | 22 |  |  |  | 204 |  |  |  | 32 |  |  |  | 42 |  |  |  | 8,766 |  |  |  | 9,067 |
Depreciation |  |  |  |  |  |  | (66 | ) |  |  | (7,087 | ) |  |  | (66 | ) |  |  | (89 | ) |  |  |  |  |  |  | (7,308 | )
Net (impairments) reversals |  |  | (64 | ) |  |  | (3 | ) |  |  | 345 |  |  |  | (1 | ) |  |  | (17 | ) |  |  | (174 | ) |  |  | 86 |
Write-off |  |  |  |  |  |  |  |  |  |  | (198 | ) |  |  | (2 | ) |  |  |  |  |  |  | (89 | ) |  |  | (289 | )
Currency translation differences |  |  | 1 |  |  |  | 1 |  |  |  | 1,329 |  |  |  |  |  |  |  | 4 |  |  |  | 551 |  |  |  | 1,886 |
Reclassification to assets held for sale |  |  | (8 | ) |  |  | (2 | ) |  |  | (1 | ) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (11 | )
Other changes |  |  | 8 |  |  |  | 40 |  |  |  | 15,011 |  |  |  | 11 |  |  |  | (34 | ) |  |  | (15,679 | ) |  |  | (643 | )
Net book amount at the end of the year |  |  | 448 |  |  |  | 810 |  |  |  | 50,270 |  |  |  | 300 |  |  |  | 309 |  |  |  | 18,656 |  |  |  | 70,793 |
Gross book amount at the end of the year |  |  | 537 |  |  |  | 3,416 |  |  |  | 167,007 |  |  |  | 1,415 |  |  |  | 2,160 |  |  |  | 22,737 |  |  |  | 197,272 |
Provisions for depreciation and impairments |  |  | 89 |  |  |  | 2,606 |  |  |  | 116,737 |  |  |  | 1,115 |  |  |  | 1,851 |  |  |  | 4,081 |  |  |  | 126,479 |
Disclosure of detailed information about segment wise capital expenditures [text block] | A breakdown by segment of capital expenditures is provided below:
(€ million) |  | 2017 |  | 2016
Capital expenditures |  |  |  |  |  |  |  |
Exploration & Production |  |  | 7,638 |  |  |  | 8,217 |
Gas & Power |  |  | 87 |  |  |  | 66 |
Refining & Marketing and Chemical |  |  | 712 |  |  |  | 655 |
Corporate and other activities |  |  | 69 |  |  |  | 42 |
Elimination of intragroup profits |  |  | (16 | ) |  |  | 87 |
|  |  | 8,490 |  |  |  | 9,067 |
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 exploration activity and appraisal and other tangible assets in progress [text block] | Property, plant and equipment include costs related to exploration activities and appraisal and tangible assets in progress and advances of the Exploration & Production segment:
(€ million) |  | Exploratory wells in progress |  | Exploratory wells completed and being evaluated |  | Exploratory successful wells in progress |  | Exploration activity and appraisal |  | Unproved mineral interest |  | Wells and installments in progress |  | Abandonment costs |  | Other tangible assets in progress |  | Total
2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Book amount at the beginning of the year |  |  | 221 |  |  |  | 1,684 |  |  |  | 913 |  |  |  | 2,818 |  |  |  | 2,450 |  |  |  | 11,690 |  |  |  | 82 |  |  |  | 14,222 |  |  |  | 17,040 |
Additions |  |  | 351 |  |  |  |  |  |  |  |  |  |  |  | 351 |  |  |  | 112 |  |  |  | 7,190 |  |  |  |  |  |  |  | 7,302 |  |  |  | 7,653 |
Net (impairments) reversals |  |  |  |  |  |  |  |  |  |  | (13 | ) |  |  | (13 | ) |  |  | 147 |  |  |  | (111 | ) |  |  |  |  |  |  | 36 |  |  |  | 23 |
Write-off |  |  | (11 | ) |  |  | (217 | ) |  |  |  |  |  |  | (228 | ) |  |  |  |  |  |  | (2 | ) |  |  |  |  |  |  | (2 | ) |  |  | (230 | )
Reclassifications |  |  | (438 | ) |  |  | 173 |  |  |  | (117 | ) |  |  | (382 | ) |  |  | (7 | ) |  |  | (9,538 | ) |  |  | (11 | ) |  |  | (9,556 | ) |  |  | (9,938 | )
Other changes and currency translation differences |  |  | (15 | ) |  |  | (377 | ) |  |  | (294 | ) |  |  | (686 | ) |  |  | (312 | ) |  |  | (2,676 | ) |  |  | (34 | ) |  |  | (3,022 | ) |  |  | (3,708 | )
Book amount at the end of the year |  |  | 108 |  |  |  | 1,263 |  |  |  | 489 |  |  |  | 1,860 |  |  |  | 2,390 |  |  |  | 6,553 |  |  |  | 37 |  |  |  | 8,980 |  |  |  | 10,840 |
2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Book amount at the beginning of the year |  |  | 93 |  |  |  | 1,737 |  |  |  | 807 |  |  |  | 2,637 |  |  |  | 2,212 |  |  |  | 19,458 |  |  |  |  |  |  |  | 21,670 |  |  |  | 24,307 |
Additions |  |  | 402 |  |  |  |  |  |  |  |  |  |  |  | 402 |  |  |  | 2 |  |  |  | 7,777 |  |  |  |  |  |  |  | 7,779 |  |  |  | 8,181 |
Net (impairments) reversals |  |  |  |  |  |  |  |  |  |  | (5 | ) |  |  | (5 | ) |  |  | 190 |  |  |  | (210 | ) |  |  |  |  |  |  | (20 | ) |  |  | (25 | )
Write-off |  |  |  |  |  |  | (109 | ) |  |  |  |  |  |  | (109 | ) |  |  |  |  |  |  | (6 | ) |  |  | 27 |  |  |  | 21 |  |  |  | (88 | )
Reclassifications |  |  | (282 | ) |  |  | 6 |  |  |  | 78 |  |  |  | (198 | ) |  |  | (35 | ) |  |  | (15,699 | ) |  |  |  |  |  |  | (15,734 | ) |  |  | (15,932 | )
Other changes and currency translation differences |  |  | 8 |  |  |  | 50 |  |  |  | 33 |  |  |  | 91 |  |  |  | 81 |  |  |  | 370 |  |  |  | 55 |  |  |  | 506 |  |  |  | 597 |
Book amount at the end of the year |  |  | 221 |  |  |  | 1,684 |  |  |  | 913 |  |  |  | 2,818 |  |  |  | 2,450 |  |  |  | 11,690 |  |  |  | 82 |  |  |  | 14,222 |  |  |  | 17,040 |
Disclosure of detailed information about stratification of the suspended wells pending final determination of proved reserves aging [text block] | The following information relates to the stratification of the suspended wells pending final determination (aging):
(€ million) |  | 2017 |  | 2016 |  | 2015
Costs for exploratory wells suspended at the beginning of the period |  |  | 1,684 |  |  |  | 1,737 |  |  |  | 1,568 |
Increases for which is ongoing the determination of proved reserves |  |  | 451 |  |  |  | 282 |  |  |  | 550 |
Amounts previously capitalized and expensed in the period |  |  | (217 | ) |  |  | (109 | ) |  |  | (501 | )
Reclassification to successful exploratory wells following the estimation of proved reserves |  |  | (278 | ) |  |  | (276 | ) |  |  | (30 | )
Disposals |  |  | (199 | ) |  |  |  |  |  |  | (4 | )
Currency translation differences |  |  | (178 | ) |  |  | 50 |  |  |  | 154 |
Costs for exploratory wells suspended at the end of the period |  |  | 1,263 |  |  |  | 1,684 |  |  |  | 1,737 |
|  | 2017 |  | 2016 |  | 2015
|  | (€ 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 |  |  | 222 |  |  |  | 7.95 |  |  |  | 16 |  |  |  | 1.05 |  |  |  | 368 |  |  |  | 5.32 |
- between 1 and 3 years |  |  | 241 |  |  |  | 3.87 |  |  |  | 609 |  |  |  | 10.25 |  |  |  | 634 |  |  |  | 11.14 |
- beyond 3 years |  |  | 800 |  |  |  | 21.44 |  |  |  | 1,059 |  |  |  | 21.55 |  |  |  | 735 |  |  |  | 18.97 |
|  |  | 1,263 |  |  |  | 33.26 |  |  |  | 1,684 |  |  |  | 32.85 |  |  |  | 1,737 |  |  |  | 35.43 |
Costs capitalized for suspended wells |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
- fields including wells drilled over the last 12 months |  |  | 148 |  |  |  | 5.88 |  |  |  | 9 |  |  |  | 0.55 |  |  |  | 368 |  |  |  | 5.32 |
- fields for which the delineation campaign is in progress |  |  | 261 |  |  |  | 4.69 |  |  |  | 251 |  |  |  | 3.51 |  |  |  | 228 |  |  |  | 4.13 |
- fields including commercial discoveries that proceeds to sanctioning |  |  | 854 |  |  |  | 22.69 |  |  |  | 1,424 |  |  |  | 28.79 |  |  |  | 1,141 |  |  |  | 25.98 |
|  |  | 1,263 |  |  |  | 33.26 |  |  |  | 1,684 |  |  |  | 32.85 |  |  |  | 1,737 |  |  |  | 35.43 |
Disclosure of detailed information about unproved mineral interests [text block] | Unproved mineral interests were as follows:
(€ million) |  | Congo |  | Nigeria |  | Turkmenistan |  | USA |  | Algeria |  | Egypt |  | Total
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 |
2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Book amount at the beginning of the year |  |  | 1,021 |  |  |  | 908 |  |  |  | 165 |  |  |  | 109 |  |  |  |  |  |  |  | 9 |  |  |  | 2,212 |
Additions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  | 2 |
Net (impairments) reversals |  |  | 190 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 190 |
Reclassification to proved mineral interest |  |  |  |  |  |  |  |  |  |  | (31 | ) |  |  |  |  |  |  |  |  |  |  | (4 | ) |  |  | (35 | )
Other changes and currency translation differences |  |  | 43 |  |  |  | 30 |  |  |  | 4 |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  | 81 |
Book amount at the end of the year |  |  | 1,254 |  |  |  | 938 |  |  |  | 138 |  |  |  | 113 |  |  |  |  |  |  |  | 7 |  |  |  | 2,450 |
Disclosure of detailed information about Property, plant and equipment by segment [text block] | Property, plant and equipment by segment
(€ million) |  | December 31, 2017 |  | December 31, 2016
Property, plant and equipment, gross |  |  |  |  |  |  |  |
Exploration & Production |  |  | 152,608 |  |  |  | 165,559 |
Gas & Power |  |  | 5,333 |  |  |  | 6,276 |
Refining & Marketing and Chemical |  |  | 24,554 |  |  |  | 24,119 |
Corporate and other activities |  |  | 1,866 |  |  |  | 1,886 |
Elimination of intragroup profits |  |  | (584 | ) |  |  | (568 | )
|  |  | 183,777 |  |  |  | 197,272 |
Accumulated depreciation, amortization and impairment losses |  |  |  |  |  |  |  |
Exploration & Production |  |  | 95,775 |  |  |  | 101,131 |
Gas & Power |  |  | 3,954 |  |  |  | 4,584 |
Refining & Marketing and Chemical |  |  | 19,625 |  |  |  | 19,477 |
Corporate and other activities |  |  | 1,525 |  |  |  | 1,518 |
Elimination of intragroup profits |  |  | (260 | ) |  |  | (231 | )
|  |  | 120,619 |  |  |  | 126,479 |
Property, plant and equipment, net |  |  |  |  |  |  |  |
Exploration & Production |  |  | 56,833 |  |  |  | 64,428 |
Gas & Power |  |  | 1,379 |  |  |  | 1,692 |
Refining & Marketing and Chemical |  |  | 4,929 |  |  |  | 4,642 |
Corporate and other activities |  |  | 341 |  |  |  | 368 |
Elimination of intragroup profits |  |  | (324 | ) |  |  | (337 | )
|  |  | 63,158 |  |  |  | 70,793 |

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