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PROPERTY, PLANT AND EQUIPMENT (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance at the beginning | $ 72,640 |
Depreciation, depletion, amortization and impairment | (9,526) | $ (10,572)
Balance at the end | 68,130 | 72,640
Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance at the beginning | 125,164 | 116,874
Adoption of IFRS 16 |  | 1,792
Additions | 3,814 | 5,596
Transfers from exploration and evaluation | 170 |
Changes in decommissioning and restoration | 1,081 | 1,895
Disposals and derecognition | (2,537) | (555)
Foreign exchange adjustments | (34) | (438)
Balance at the end | 127,658 | 125,164
Accumulated provision |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance at the beginning | (52,524) | (42,629)
Disposals and derecognition | 2,205 | 465
Foreign exchange adjustments | (4) | 275
Depreciation, depletion, amortization and impairment | (9,205) | (10,635)
Balance at the end | (59,528) | (52,524)
Oil and Gas properties |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance at the beginning | 18,207 |
Balance at the end | 17,236 | 18,207
Oil and Gas properties | Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance at the beginning | 40,596 | 37,845
Additions | 820 | 1,245
Transfers from exploration and evaluation | 170 |
Changes in decommissioning and restoration | 1,078 | 1,846
Disposals and derecognition | (9) | (116)
Foreign exchange adjustments | 54 | (224)
Balance at the end | 42,709 | 40,596
Oil and Gas properties | Accumulated provision |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance at the beginning | (22,389) | (19,783)
Disposals and derecognition |  | 116
Foreign exchange adjustments | (45) | 149
Depreciation, depletion, amortization and impairment | (3,039) | (2,871)
Balance at the end | (25,473) | (22,389)
Plant and Equipment |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance at the beginning | 54,433 |
Balance at the end | 50,894 | 54,433
Plant and Equipment | Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance at the beginning | 84,568 | 79,029
Adoption of IFRS 16 |  | 1,792
Additions | 2,994 | 4,351
Changes in decommissioning and restoration | 3 | 49
Disposals and derecognition | (2,528) | (439)
Foreign exchange adjustments | (88) | (214)
Balance at the end | 84,949 | 84,568
Plant and Equipment | Accumulated provision |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance at the beginning | (30,135) | (22,846)
Disposals and derecognition | 2,205 | 349
Foreign exchange adjustments | 41 | 126
Depreciation, depletion, amortization and impairment | (6,166) | (7,764)
Balance at the end | $ (34,055) | $ (30,135)

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- Definition The amount of additions to property, plant and equipment other than those acquired through business combinations. [Refer: Business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of depreciation expense, amortisation expense and impairment loss (reversal of impairment loss) recognised in profit or loss. [Refer: Depreciation and amortisation expense; Impairment loss (reversal of impairment loss) recognised in profit or loss] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The decrease in property, plant and equipment resulting from disposals and retirements. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in property, plant and equipment resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [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 -Subparagraph e -Clause viii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e_viii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_a&doctype=Standard -URIDate 2020-01-01 + Details
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