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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment, weighted average capitalised interest rate | 3.40% | 3.70%
Adjustment to cost and accumulated depreciation | $ 1,157 | $ 978

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- Definition The weighted average of interest and other costs that an entity incurs in connection with the borrowing of funds applicable to the borrowings of the entity that are outstanding during the period, other than borrowings made specifically for the purpose of obtaining a qualifying asset. [Refer: Weighted average [member]; Borrowings] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 23 -IssueDate 2021-01-01 -Paragraph 26 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=23&code=ifrs-tx-2021-en-r&anchor=para_26_b&doctype=Standard -URIDate 2021-03-24 + Details
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Balance Type: | na
Period Type: | duration

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition The amount of property, plant and equipment retired from active use and not classified as held for sale in accordance with IFRS 5. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 16 -IssueDate 2021-01-01 -Paragraph 79 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_79_c&doctype=Standard -URIDate 2021-03-24 + Details
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Namespace Prefix: | ifrs-full_
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Balance Type: | debit
Period Type: | instant