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Employee Future Benefits - Schedule of Net Benefit Costs (Details) - CAD
CAD in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Pension Plans    
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]    
Service costs CAD 66 CAD 68
Interest costs 112 109
Expected return on plan assets (145) (140)
Amortization of actuarial losses 48 57
Amortization of past service credits/plan amendments 1 2
Regulatory adjustments 6 1
Net benefit cost 88 97
OPEB Plans    
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]    
Service costs 18 17
Interest costs 23 23
Expected return on plan assets (12) (12)
Amortization of actuarial losses 2 5
Amortization of past service credits/plan amendments (10) (12)
Regulatory adjustments 9 6
Net benefit cost CAD 30 CAD 27