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POST-EMPLOYMENT BENEFITS - Sensitivity of Key Assumptions (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Discount rate |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Percentage of reasonably possible increase in actuarial assumption | 0.50% | 0.50%
Percentage of reasonably possible decrease in actuarial assumption | 0.50% | 0.50%
Defined benefit obligation |  |
Increase (decrease) in accrued benefit obligation due to reasonably possible increase in actuarial assumption | $ (279) | $ (233)
Increase (decrease) in accrued benefit obligation due to reasonably possible decrease in actuarial assumption | $ 319 | $ 266
Percentage of reasonably possible increase in actuarial assumption | 0.50% | 0.50%
Percentage of reasonably possible decrease in actuarial assumption | 0.50% | 0.50%
Rate of future compensation increase |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Percentage of reasonably possible increase in actuarial assumption | 0.25% | 0.25%
Percentage of reasonably possible decrease in actuarial assumption | 0.25% | 0.25%
Defined benefit obligation |  |
Increase (decrease) in accrued benefit obligation due to reasonably possible increase in actuarial assumption | $ 20 | $ 17
Increase (decrease) in accrued benefit obligation due to reasonably possible decrease in actuarial assumption | $ (20) | $ (17)
Percentage of reasonably possible increase in actuarial assumption | 0.25% | 0.25%
Percentage of reasonably possible decrease in actuarial assumption | 0.25% | 0.25%
Mortality rate |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Duration of reasonably possible increase in actuarial assumption | 1 year | 1 year
Duration of reasonably possible decrease in actuarial assumption | 1 year | 1 year
Defined benefit obligation |  |
Increase (decrease) in accrued benefit obligation due to reasonably possible increase in actuarial assumption | $ 76 | $ 61
Increase (decrease) in accrued benefit obligation due to reasonably possible decrease in actuarial assumption | $ (80) | $ (64)
Duration of reasonably possible increase in actuarial assumption | 1 year | 1 year
Duration of reasonably possible decrease in actuarial assumption | 1 year | 1 year

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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_145_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_145_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The reasonably possible percentage of the decrease in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_145_a&doctype=Standard -URIDate 2020-01-01 + Details
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