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PROPERTY, PLANT AND EQUIPMENT (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance at the beginning | $ 74,245 |
Transfers from exploration and evaluation |  | $ 31
Depreciation, depletion, amortization and impairment | (10,572) | (5,738)
Balance at the end | 72,640 | 74,245
Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance at the beginning | 116,874 | 114,848
Adoption of IFRS 16 (note 5) | 1,792 |
Additions | 5,596 | 5,179
Acquisitions (notes 32 to 34) |  | 1,237
Changes in decommissioning and restoration | 1,895 | 63
Disposals and derecognition | (555) | (5,160)
Foreign exchange adjustments | (438) | 676
Balance at the end | 125,164 | 116,874
Accumulated provision |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance at the beginning | (42,629) | (41,355)
Disposals and derecognition | 465 | 4,800
Foreign exchange adjustments | 275 | (486)
Depreciation, depletion, amortization and impairment | 10,635 | (5,588)
Balance at the end | (52,524) | (42,629)
Oil and Gas properties |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance at the beginning | 18,062 |
Transfers from exploration and evaluation |  | 31
Balance at the end | 18,207 | 18,062
Oil and Gas properties | Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance at the beginning | 37,845 | 36,209
Additions | 1,245 | 1,221
Acquisitions (notes 32 to 34) |  | 289
Changes in decommissioning and restoration | 1,846 | 85
Disposals and derecognition | (116) | (375)
Foreign exchange adjustments | (224) | 385
Balance at the end | 40,596 | 37,845
Oil and Gas properties | Accumulated provision |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance at the beginning | (19,783) | (17,975)
Disposals and derecognition | 116 | 255
Foreign exchange adjustments | 149 | (324)
Depreciation, depletion, amortization and impairment | 2,871 | (1,739)
Balance at the end | (22,389) | (19,783)
Plant and Equipment |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance at the beginning | 56,183 |
Balance at the end | 54,433 | 56,183
Plant and Equipment | Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance at the beginning | 79,029 | 78,639
Adoption of IFRS 16 (note 5) | 1,792 |
Additions | 4,351 | 3,958
Acquisitions (notes 32 to 34) |  | 948
Changes in decommissioning and restoration | 49 | (22)
Disposals and derecognition | (439) | (4,785)
Foreign exchange adjustments | (214) | 291
Balance at the end | 84,568 | 79,029
Plant and Equipment | Accumulated provision |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance at the beginning | (22,846) | (23,380)
Disposals and derecognition | 349 | 4,545
Foreign exchange adjustments | 126 | (162)
Depreciation, depletion, amortization and impairment | 7,764 | (3,849)
Balance at the end | $ (30,135) | $ (22,846)

X
- Definition The increase in property, plant and equipment resulting from acquisitions 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 2019-01-01 -Paragraph 73 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e_iii&doctype=Standard -URIDate 2019-03-27 + Details
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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 2019-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e_i&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 73 -Subparagraph e -Clause viii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e_viii&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_a&doctype=Standard -URIDate 2019-03-27 + Details
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