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SUPPLEMENTAL CASH FLOW INFORMATION - Additions to property, plant and equipment, net (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Cash Flow Statement [Abstract] |  |
Capital expenditures before proceeds on disposition | $ 2,312 | $ 2,845
Proceeds on disposition | 0 | (38)
Capital expenditures | $ 2,312 | $ 2,807

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- Definition The cash inflow from sales of property, plant and equipment, classified as investing activities. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 16 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_16_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The cash outflow for the purchases of property, plant and equipment, classified as investing activities. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 16 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_16_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Cash Flow Statement [Abstract] + References No definition available. + Details
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- Definition Proceeds From Sales (Purchase Of) Property, Plant and Equipment, Classified As Investing Activities + References No definition available. + Details
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