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POST-EMPLOYMENT BENEFITS - Sensitivity of Key Assumptions (Details) - CAD
CAD in Millions
12 Months Ended
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)