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STOCK-BASED COMPENSATION - Summary of Stock-based Compensation Expense (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Total stock-based compensation expense | $ 60 | $ 70
Stock options |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Total stock-based compensation expense | (1) | 1
Restricted share units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Total stock-based compensation expense | 49 | 47
Deferred share units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Total stock-based compensation expense | (3) | 4
Equity derivative effect, net of interest receipt |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Total stock-based compensation expense | $ 15 | $ 18

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of expense from share-based payment transactions with employees. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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