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POST-EMPLOYMENT BENEFITS - Sensitivity of Key Assumptions (Details) - CAD CAD in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
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 | CAD (207) | CAD (174)
Increase (decrease) in accrued benefit obligation due to reasonably possible decrease in actuarial assumption | 237 | 199
Pension expense |  |
Increase (decrease) in pension expense due to reasonably possible increase in actuarial assumption | (25) | (21)
Increase (decrease) in pension expense due to reasonably possible decrease in actuarial assumption | CAD 27 | CAD 23
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 | CAD 21 | CAD 18
Increase (decrease) in accrued benefit obligation due to reasonably possible decrease in actuarial assumption | (21) | (18)
Pension expense |  |
Increase (decrease) in pension expense due to reasonably possible increase in actuarial assumption | 4 | 4
Increase (decrease) in pension expense due to reasonably possible decrease in actuarial assumption | CAD (4) | CAD (4)
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 | CAD 49 | CAD 48
Increase (decrease) in accrued benefit obligation due to reasonably possible decrease in actuarial assumption | (52) | (49)
Pension expense |  |
Increase (decrease) in pension expense due to reasonably possible increase in actuarial assumption | 6 | 5
Increase (decrease) in pension expense due to reasonably possible decrease in actuarial assumption | CAD (6) | CAD (5)

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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 2017-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_145_a&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_145_a&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_145_a&doctype=Standard -URIDate 2017-03-09 + Details
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