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Property Plant And Equipment | 12 Months Ended
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Dec. 31, 2018
PROPERTY, PLANT AND EQUIPMENT. |
PROPERTY, PLANT AND EQUIPMENT | 15. PROPERTY, PLANT AND EQUIPMENT
($ millions) |  | Oil and Gas Properties |  | Plant and Equipment |  | Total |  |
Cost |  |  |  |  |  |  |  |
At December 31, 2016 |  | 34 141 |  | 73 537 |  | 107 678 |  |
| Additions |  | 1 235 |  | 5 875 |  | 7 110 |  |
| Acquisitions (note 32) |  | 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 34) |  | — |  | 35 |  | 35 |  |
At December 31, 2017 |  | 36 209 |  | 78 639 |  | 114 848 |  |
| Additions |  | 1 221 |  | 3 958 |  | 5 179 |  |
| Transfers from exploration and evaluation |  | 31 |  | — |  | 31 |  |
| Acquisitions (notes 31, 32 and 36) |  | 289 |  | 948 |  | 1 237 |  |
| Changes in decommissioning and restoration |  | 85 |  | (22 | ) | 63 |  |
| Disposals and derecognition |  | (375 | ) | (4 785 | ) | (5 160 | ) |
| Foreign exchange adjustments |  | 385 |  | 291 |  | 676 |  |
At December 31, 2018 |  | 37 845 |  | 79 029 |  | 116 874 |  |
Accumulated provision |  |  |  |  |  |  |  |
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 34) |  | — |  | (3 | ) | (3 | ) |
At December 31, 2017 |  | (17 975 | ) | (23 380 | ) | (41 355 | ) |
| Depreciation and depletion |  | (1 739 | ) | (3 849 | ) | (5 588 | ) |
| Disposals and derecognition |  | 255 |  | 4 545 |  | 4 800 |  |
| Foreign exchange adjustments |  | (324 | ) | (162 | ) | (486 | ) |
At December 31, 2018 |  | (19 783 | ) | (22 846 | ) | (42 629 | ) |
Net property, plant and equipment |  |  |  |  |  |  |  |
| December 31, 2017 |  | 18 234 |  | 55 259 |  | 73 493 |  |
| December 31, 2018 |  | 18 062 |  | 56 183 |  | 74 245 |  |
|  | December 31, 2018 |  | December 31, 2017 |
($ millions) |  | Cost |  | Accumulated Provision |  | Net Book Value |  | Cost |  | Accumulated Provision |  | Net Book Value |
Oil Sands |  | 80 295 |  | (22 654 | ) | 57 641 |  | 79 625 |  | (22 664 | ) | 56 961 |
Exploration and Production |  | 21 867 |  | (14 075 | ) | 7 792 |  | 21 007 |  | (12 990 | ) | 8 017 |
Refining and Marketing |  | 13 627 |  | (5 092 | ) | 8 535 |  | 13 137 |  | (4 906 | ) | 8 231 |
Corporate, Energy Trading and Eliminations |  | 1 085 |  | (808 | ) | 277 |  | 1 079 |  | (795 | ) | 284 |
|  | 116 874 |  | (42 629 | ) | 74 245 |  | 114 848 |  | (41 355 | ) | 73 493 |
At December 31, 2018, the balance of assets under construction and not subject to depreciation or depletion was $4.7 billion (December 31, 2017 – $15.9 billion). At December 31, 2018, Property, Plant and Equipment included finance leases with a net book value of $1.4 billion (December 31, 2017 – $1.4 billion).

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