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POST-EMPLOYMENT BENEFITS - Sensitivity of Key Assumptions (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Discount rate |  |
Defined benefit obligation |  |
Increase (decrease) in accrued benefit obligation due to reasonably possible increase in actuarial assumption | $ (183) | $ (163)
Increase (decrease) in accrued benefit obligation due to reasonably possible decrease in actuarial assumption | $ 208 | $ 183
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 |  |
Defined benefit obligation |  |
Increase (decrease) in accrued benefit obligation due to reasonably possible increase in actuarial assumption | $ 13 | $ 10
Increase (decrease) in accrued benefit obligation due to reasonably possible decrease in actuarial assumption | $ (13) | $ (10)
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 |  |
Defined benefit obligation |  |
Increase (decrease) in accrued benefit obligation due to reasonably possible increase in actuarial assumption | $ 38 | $ 42
Increase (decrease) in accrued benefit obligation due to reasonably possible decrease in actuarial assumption | $ (42) | $ (45)
Duration of reasonably possible increase in actuarial assumption (in years) | 1 year | 1 year
Duration of reasonably possible decrease in actuarial assumption (in years) | 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 2023-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_145_a&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_145_a&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_145_a&doctype=Standard -URIDate 2023-03-23 + Details
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