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PROPERTY, PLANT AND EQUIPMENT (Tables) | 12 Months Ended
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Dec. 31, 2020
PROPERTY PLANT AND EQUIPMENT |
Disclosure of changes in property, plant and equipment |
($ millions) |  | Oil and Gas Properties |  | Plant and Equipment |  | Total |  |
Cost |  |  |  |  |  |  |  |
At December 31, 2018 |  | 37 845 |  | 79 029 |  | 116 874 |  |
| Adoption of IFRS 16 |  | — |  | 1 792 |  | 1 792 |  |
| Additions |  | 1 245 |  | 4 351 |  | 5 596 |  |
| Changes in decommissioning and restoration |  | 1 846 |  | 49 |  | 1 895 |  |
| Disposals and derecognition |  | (116 | ) | (439 | ) | (555 | ) |
| Foreign exchange adjustments |  | (224 | ) | (214 | ) | (438 | ) |
At December 31, 2019 |  | 40 596 |  | 84 568 |  | 125 164 |  |
| Additions |  | 820 |  | 2 994 |  | 3 814 |  |
| Transfers from exploration and evaluation |  | 170 |  | — |  | 170 |  |
| Changes in decommissioning and restoration |  | 1 078 |  | 3 |  | 1 081 |  |
| Disposals and derecognition |  | (9 | ) | (2 528 | ) | (2 537 | ) |
| Foreign exchange adjustments |  | 54 |  | (88 | ) | (34 | ) |
At December 31, 2020 |  | 42 709 |  | 84 949 |  | 127 658 |  |
Accumulated provision |  |  |  |  |  |  |  |
At December 31, 2018 |  | (19 783 | ) | (22 846 | ) | (42 629 | ) |
| Depreciation, depletion, amortization and impairment |  | (2 871 | ) | (7 764 | ) | (10 635 | ) |
| Disposals and derecognition |  | 116 |  | 349 |  | 465 |  |
| Foreign exchange adjustments |  | 149 |  | 126 |  | 275 |  |
At December 31, 2019 |  | (22 389 | ) | (30 135 | ) | (52 524 | ) |
| Depreciation, depletion, amortization and impairment |  | (3 039 | ) | (6 166 | ) | (9 205 | ) |
| Disposals and derecognition |  | — |  | 2 205 |  | 2 205 |  |
| Foreign exchange adjustments |  | (45 | ) | 41 |  | (4 | ) |
At December 31, 2020 |  | (25 473 | ) | (34 055 | ) | (59 528 | ) |
Net property, plant and equipment |  |  |  |  |  |  |  |
| December 31, 2019 |  | 18 207 |  | 54 433 |  | 72 640 |  |
| December 31, 2020 |  | 17 236 |  | 50 894 |  | 68 130 |  |
|  | December 31, 2020 |  | December 31, 2019 |
($ millions) |  | Cost |  | Accumulated Provision |  | Net Book Value |  | Cost |  | Accumulated Provision |  | Net Book Value |
Oil Sands |  | 86 999 |  | (35 059 | ) | 51 940 |  | 85 246 |  | (30 581 | ) | 54 665 |
Exploration and Production |  | 23 640 |  | (17 424 | ) | 6 216 |  | 22 876 |  | (15 298 | ) | 7 578 |
Refining and Marketing |  | 15 757 |  | (6 547 | ) | 9 210 |  | 15 342 |  | (5 768 | ) | 9 574 |
Corporate and Eliminations |  | 1 262 |  | (498 | ) | 764 |  | 1 700 |  | (877 | ) | 823 |
|  | 127 658 |  | (59 528 | ) | 68 130 |  | 125 164 |  | (52 524 | ) | 72 640 |

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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 2020-01-01 -Paragraph 73 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73&doctype=Standard -URIDate 2020-01-01 + Details
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