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INCOME TAXES - Unrecognized deferred tax assets (Details) - CAD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Total unrecognized temporary differences	$ 192	$ 149
Realized and accrued capital losses in Canada that can be applied against future capital gains
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Total unrecognized temporary differences	82	41
Tax losses in foreign jurisdictions that expire between 2023 and 2039
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Total unrecognized temporary differences	67	67
Deductible temporary differences in foreign jurisdictions
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Total unrecognized temporary differences	$ 43	$ 41