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RETIREMENT AND POSTRETIREMENT BENEFITS - MEDICAL COST TRENDS (Details)
CAD in Millions
12 Months Ended
Dec. 31, 2016
CAD
Effect of 1% change in assumed medical care trend rate  
Increase in benefit obligation due to 1% increase in the assumed medical care trend rate CAD 23
Increase in service and interest cost due to 1% increase in the assumed medical care trend rate 1
Decrease in benefit obligation due to 1% decrease in the assumed medical care trend rate 45
Decrease in service and interest cost due to 1% decrease in the assumed medical care trend rate CAD 2
Canadian OPEB Plans | Drugs  
MEDICAL COST TRENDS  
Medical Cost Trend Rate Assumption for Next Fiscal Year (as a percent) 6.60%
Ultimate Medical Cost Trend Rate Assumption (as a percent) 4.50%
Year in which Ultimate Medical Cost Trend Rate Assumption is Achieved 2034
Canadian OPEB Plans | Other medical  
MEDICAL COST TRENDS  
Medical Cost Trend Rate Assumption for Next Fiscal Year (as a percent) 4.50%
United States OPEB Plan  
MEDICAL COST TRENDS  
Medical Cost Trend Rate Assumption for Next Fiscal Year (as a percent) 6.90%
Ultimate Medical Cost Trend Rate Assumption (as a percent) 4.50%
Year in which Ultimate Medical Cost Trend Rate Assumption is Achieved 2037