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Employee Future Benefits - Schedule of Funded Status (Details) - CAD
CAD in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Change in value of plan assets    
Balance, beginning of year CAD 2,647  
Balance, end of year 2,898 CAD 2,647
Defined Benefit Pension Plans    
Change in benefit obligation    
Balance, beginning of year 2,828 2,604
Liabilities assumed on acquisition 167 0
Service costs 66 68
Employee contributions 17 17
Interest costs 112 109
Benefits paid (119) (118)
Actuarial losses (gains) 45 (102)
Past service credits/plan amendments (10) 0
Foreign currency translation impacts (69) 250
Balance, end of year 3,037 2,828
Change in value of plan assets    
Balance, beginning of year 2,466 2,216
Assets assumed on acquisition 85 0
Actual return on plan assets 187 30
Benefits paid (119) (118)
Employee contributions 17 17
Employer contributions 47 99
Foreign currency translation impacts (37) 222
Balance, end of year 2,646 2,466
Funded status (391) (362)
Accumulated benefit obligation 2,741 2,595
OPEB Plans    
Change in benefit obligation    
Balance, beginning of year 574 564
Liabilities assumed on acquisition 111 0
Service costs 18 17
Employee contributions 2 1
Interest costs 23 23
Benefits paid (23) (21)
Actuarial losses (gains) (1) (50)
Past service credits/plan amendments 0 (10)
Foreign currency translation impacts (28) 50
Balance, end of year 676 574
Change in value of plan assets    
Balance, beginning of year 181 154
Assets assumed on acquisition 65 0
Actual return on plan assets 13 0
Benefits paid (23) (21)
Employee contributions 2 1
Employer contributions 18 17
Foreign currency translation impacts (4) 30
Balance, end of year 252 181
Funded status CAD (424) CAD (393)