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SUPPLEMENTARY OIL & GAS INFORMATION (Unaudited) - Costs Incurred in Crude Oil and Natural Gas Activities (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Line Items] |  |  |
Property acquisitions, proved | $ 3,405 | $ 341 | $ 15,091
Property acquisitions, unproved | 91 | 251 | 321
Exploration | 71 | 151 | 127
Development | 5,269 | 3,567 | 4,109
Costs incurred | 8,836 | 4,310 | 19,648
North America |  |  |
Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Line Items] |  |  |
Property acquisitions, proved | 3,405 | 214 | 15,091
Property acquisitions, unproved | 91 | 340 | 321
Exploration | 38 | 116 | 112
Development | 4,687 | 3,245 | 3,753
Costs incurred | 8,221 | 3,915 | 19,277
North Sea |  |  |
Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Line Items] |  |  |
Property acquisitions, proved | 0 | 127 | 0
Property acquisitions, unproved | 0 | 0 | 0
Exploration | 0 | 0 | 0
Development | 349 | 110 | 255
Costs incurred | 349 | 237 | 255
Offshore Africa |  |  |
Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Line Items] |  |  |
Property acquisitions, proved | 0 | 0 | 0
Property acquisitions, unproved | 0 | (89) | 0
Exploration | 33 | 35 | 15
Development | 233 | 212 | 101
Costs incurred | $ 266 | $ 158 | $ 116

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- Definition Costs Incurred, Acquisition Of Unproved Oil And Gas Properties1 + References No definition available. + Details
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- Definition [Line Items] for Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Table] + References No definition available. + Details
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- Definition The amount of expense arising from the search for mineral resources, including minerals, oil, natural gas and similar non-regenerative resources after the entity has obtained legal rights to explore in a specific area, as well as the determination of the technical feasibility and commercial viability of extracting the mineral resource. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 6 -IssueDate 2019-01-01 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=6&code=ifrs-tx-2019-en-r&anchor=para_24_b&doctype=Standard -URIDate 2019-03-27 + Details
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