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PROPERTY, PLANT AND EQUIPMENT - Detailed information about property, plant and equipment (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning Balance | $ 50,910 |
Ending Balance | 65,170 | $ 50,910
Project costs not subject to depletion and depreciation | 944 | 846
Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning Balance | 101,826 | 98,425
Additions | 5,232 | 4,609
Transfers from E&E assets | 198 | 211
Disposals/derecognitions | (827) | (1,042)
Foreign exchange adjustments and other | (861) | (377)
Ending Balance | 119,749 | 101,826
Accumulated depletion and depreciation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning Balance | (50,916) | (46,950)
Expense | (5,186) | (4,840)
Disposals/derecognitions | 827 | 641
Foreign exchange adjustments and other | 696 | 233
Ending Balance | (54,579) | (50,916)
Operating segments | North America |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning Balance | 23,336 |
Ending Balance | 23,665 | 23,336
Operating segments | North America | Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning Balance | 61,647 | 60,540
Additions | 3,003 | 1,462
Transfers from E&E assets | 198 | 211
Disposals/derecognitions | (381) | (566)
Foreign exchange adjustments and other | 0 | 0
Ending Balance | 64,816 | 61,647
Operating segments | North America | Accumulated depletion and depreciation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning Balance | (38,311) | (35,347)
Expense | (3,220) | (3,440)
Disposals/derecognitions | 381 | 486
Foreign exchange adjustments and other | (1) | (10)
Ending Balance | (41,151) | (38,311)
Operating segments | North Sea |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning Balance | 1,796 |
Ending Balance | 1,473 | 1,796
Operating segments | North Sea | Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning Balance | 7,380 | 7,414
Additions | 255 | 186
Transfers from E&E assets | 0 | 0
Disposals/derecognitions | 0 | 0
Foreign exchange adjustments and other | (509) | (220)
Ending Balance | 7,126 | 7,380
Operating segments | North Sea | Accumulated depletion and depreciation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning Balance | (5,584) | (5,264)
Expense | (509) | (457)
Disposals/derecognitions | 0 | 0
Foreign exchange adjustments and other | 440 | 137
Ending Balance | (5,653) | (5,584)
Operating segments | Offshore Africa |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning Balance | 1,335 |
Ending Balance | 1,162 | 1,335
Operating segments | Offshore Africa | Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning Balance | 5,132 | 5,173
Additions | 101 | 116
Transfers from E&E assets | 0 | 0
Disposals/derecognitions | 0 | 0
Foreign exchange adjustments and other | (352) | (157)
Ending Balance | 4,881 | 5,132
Operating segments | Offshore Africa | Accumulated depletion and depreciation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning Balance | (3,797) | (3,659)
Expense | (205) | (243)
Disposals/derecognitions | 0 | 0
Foreign exchange adjustments and other | 283 | 105
Ending Balance | (3,719) | (3,797)
Operating segments | Oil Sands Mining and Upgrading |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning Balance | 24,210 |
Ending Balance | 38,456 | 24,210
Operating segments | Oil Sands Mining and Upgrading | Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning Balance | 27,038 | 24,343
Additions | 1,660 | 2,822
Transfers from E&E assets | 0 | 0
Disposals/derecognitions | (446) | (127)
Foreign exchange adjustments and other | 0 | 0
Ending Balance | 42,084 | 27,038
Operating segments | Oil Sands Mining and Upgrading | Accumulated depletion and depreciation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning Balance | (2,828) | (2,294)
Expense | (1,220) | (662)
Disposals/derecognitions | 446 | 127
Foreign exchange adjustments and other | (26) | 1
Ending Balance | (3,628) | (2,828)
Operating segments | Midstream |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning Balance | 119 |
Ending Balance | 304 | 119
Operating segments | Midstream | Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning Balance | 234 | 577
Additions | 194 | 6
Transfers from E&E assets | 0 | 0
Disposals/derecognitions | 0 | (349)
Foreign exchange adjustments and other | 0 | 0
Ending Balance | 428 | 234
Operating segments | Midstream | Accumulated depletion and depreciation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning Balance | (115) | (132)
Expense | (9) | (11)
Disposals/derecognitions | 0 | 28
Foreign exchange adjustments and other | 0 | 0
Ending Balance | (124) | (115)
Head office |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning Balance | 114 |
Ending Balance | 110 | 114
Head office | Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning Balance | 395 | 378
Additions | 19 | 17
Transfers from E&E assets | 0 | 0
Disposals/derecognitions | 0 | 0
Foreign exchange adjustments and other | 0 | 0
Ending Balance | 414 | 395
Head office | Accumulated depletion and depreciation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning Balance | (281) | (254)
Expense | (23) | (27)
Disposals/derecognitions | 0 | 0
Foreign exchange adjustments and other | 0 | 0
Ending Balance | (304) | $ (281)
AOSP | Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Acquisition of AOSP and other assets (note 7) | 14,181 |
AOSP | Operating segments | North America | Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Acquisition of AOSP and other assets (note 7) | 349 |
AOSP | Operating segments | North Sea | Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Acquisition of AOSP and other assets (note 7) | 0 |
AOSP | Operating segments | Offshore Africa | Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Acquisition of AOSP and other assets (note 7) | 0 |
AOSP | Operating segments | Oil Sands Mining and Upgrading | Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Acquisition of AOSP and other assets (note 7) | 13,832 |
AOSP | Operating segments | Midstream | Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Acquisition of AOSP and other assets (note 7) | 0 |
AOSP | Head office | Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Acquisition of AOSP and other assets (note 7) | $ 0 |

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- 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 2017-01-01 -Paragraph 73 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_iii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of expenditure capitalised during the construction of non-current assets that are not yet available for use. [Refer: Non-current assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 37 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_37&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of depreciation of property, plant and equipment. [Refer: Depreciation and amortisation expense; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_vii&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 75 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_75_a&doctype=Standard -URIDate 2017-03-09 + Details
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