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Property Plant And Equipment | 12 Months Ended
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Dec. 31, 2017
PROPERTY, PLANT AND EQUIPMENT. |
PROPERTY, PLANT AND EQUIPMENT | 18. PROPERTY, PLANT AND EQUIPMENT
($ millions) |  | Oil and Gas Properties |  | Plant and Equipment |  | Total |  |
Cost |  |  |  |  |  |  |  |
At December 31, 2015 |  | 32 635 |  | 61 077 |  | 93 712 |  |
| Additions |  | 1 428 |  | 5 142 |  | 6 570 |  |
| Transfers from exploration and evaluation |  | 65 |  | — |  | 65 |  |
| Acquisitions (notes 7 and 8) |  | 1 678 |  | 9 128 |  | 10 806 |  |
| Changes in decommissioning and restoration |  | (68 | ) | 21 |  | (47 | ) |
| Disposals and derecognition |  | (166 | ) | (803 | ) | (969 | ) |
| Foreign exchange adjustments |  | (1 431 | ) | (121 | ) | (1 552 | ) |
| Reclassified to assets held for sale (notes 36 and 37) |  | — |  | (907 | ) | (907 | ) |
At December 31, 2016 |  | 34 141 |  | 73 537 |  | 107 678 |  |
| Additions |  | 1 235 |  | 5 875 |  | 7 110 |  |
| Acquisitions (note 35) |  | 25 |  | 310 |  | 335 |  |
| Changes in decommissioning and restoration |  | 821 |  | 22 |  | 843 |  |
| Disposals and derecognition |  | — |  | (884 | ) | (884 | ) |
| Foreign exchange adjustments |  | (13 | ) | (256 | ) | (269 | ) |
| Reclassified from assets held for sale (note 37) |  | — |  | 35 |  | 35 |  |
At December 31, 2017 |  | 36 209 |  | 78 639 |  | 114 848 |  |
Accumulated provision |  |  |  |  |  |  |  |
At December 31, 2015 |  | (14 442 | ) | (18 119 | ) | (32 561 | ) |
| Depreciation and depletion |  | (2 598 | ) | (3 133 | ) | (5 731 | ) |
| Disposals and derecognition |  | — |  | 645 |  | 645 |  |
| Foreign exchange adjustments |  | 978 |  | 55 |  | 1 033 |  |
| Reclassified to assets held for sale (notes 36 and 37) |  | — |  | 195 |  | 195 |  |
At December 31, 2016 |  | (16 062 | ) | (20 357 | ) | (36 419 | ) |
| Depreciation and depletion |  | (1 916 | ) | (3 514 | ) | (5 430 | ) |
| Disposals and derecognition |  | — |  | 368 |  | 368 |  |
| Foreign exchange adjustments |  | 3 |  | 126 |  | 129 |  |
| Reclassified from assets held for sale (note 37) |  | — |  | (3 | ) | (3 | ) |
At December 31, 2017 |  | (17 975 | ) | (23 380 | ) | (41 355 | ) |
Net property, plant and equipment |  |  |  |  |  |  |  |
| December 31, 2016 |  | 18 079 |  | 53 180 |  | 71 259 |  |
| December 31, 2017 |  | 18 234 |  | 55 259 |  | 73 493 |  |
|  | Dec 31, 2017 |  | Dec 31, 2016 |
($ millions) |  | Cost |  | Accumulated Provision |  | Net Book Value |  | Cost |  | Accumulated Provision |  | Net Book Value |
Oil Sands |  | 79 625 |  | (22 664 | ) | 56 961 |  | 73 882 |  | (19 341 | ) | 54 541 |
Exploration and Production |  | 21 007 |  | (12 990 | ) | 8 017 |  | 20 058 |  | (12 020 | ) | 8 038 |
Refining and Marketing |  | 13 137 |  | (4 906 | ) | 8 231 |  | 12 741 |  | (4 363 | ) | 8 378 |
Corporate, Energy Trading and Eliminations |  | 1 079 |  | (795 | ) | 284 |  | 997 |  | (695 | ) | 302 |
|  | 114 848 |  | (41 355 | ) | 73 493 |  | 107 678 |  | (36 419 | ) | 71 259 |
At December 31, 2017, the balance of assets under construction and not subject to depreciation or depletion was $15.9 billion (December 31, 2016 – $16.0 billion). At December 31, 2017, Property, Plant and Equipment included finance leases with a net book value of $1.4 billion (December 31, 2016 – $1.2 billion).

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- Definition The entire disclosure for property, plant and equipment. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=sect_Disclosure&doctype=Standard -URIDate 2017-03-09 + Details
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