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Employee Future Benefits - Effect of Changing Health Care Cost Trend Rate by 1% (Details) - OPEB Plans
CAD in Millions
12 Months Ended
Dec. 31, 2016
CAD
Defined Benefit Plan Disclosure [Line Items]  
1% increase in rate, increase (decrease) in accumulated benefit obligation CAD 89
1% decrease in rate, increase (decrease) in accumulated benefit obligation Obligation (71)
1% increase in rate, increase (decrease) in service and interest costs 19
1% decrease in rate, increase (decrease) in service and interest costs CAD (13)