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Employee Future Benefits - Defined Benefit Obligation (Details) - CAD
CAD in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, beginning of period CAD 230    
Current service cost 10 CAD 11 CAD 11
Actuarial gain arising from demographic assumptions 6 (8)  
Defined benefit obligation, ending of period 247 230  
Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, beginning of period 663 678  
Current service cost 10 11  
Interest cost 24 25 25
Benefits paid (55) (46)  
Actuarial gain arising from demographic assumptions 5 (5)  
Actuarial loss arising from financial assumptions 29 2  
Actuarial gain (loss) arising from experience adjustments 2 0  
Effect of translation on US plans (3) (2)  
Defined benefit obligation, ending of period 675 663 678
Registered      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, beginning of period 131    
Current service cost 7 7 7
Defined benefit obligation, ending of period 145 131  
Registered | Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, beginning of period 554 566  
Current service cost 7 7  
Interest cost 20 21 21
Benefits paid (51) (40)  
Actuarial gain arising from demographic assumptions 4 (1)  
Actuarial loss arising from financial assumptions 26 2  
Actuarial gain (loss) arising from experience adjustments 3 0  
Effect of translation on US plans (2) (1)  
Defined benefit obligation, ending of period 561 554 566
Supplemental      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, beginning of period 72    
Current service cost 2 2 2
Defined benefit obligation, ending of period 75 72  
Supplemental | Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, beginning of period 82 80  
Current service cost 2 2  
Interest cost 3 3 3
Benefits paid (4) (5)  
Actuarial gain arising from demographic assumptions 1 0  
Actuarial loss arising from financial assumptions 3 0  
Actuarial gain (loss) arising from experience adjustments 0 2  
Effect of translation on US plans 0 0  
Defined benefit obligation, ending of period 87 82 80
Other      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, beginning of period 27    
Current service cost 1 2 2
Defined benefit obligation, ending of period 27 27  
Other | Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, beginning of period 27 32  
Current service cost 1 2  
Interest cost 1 1 1
Benefits paid 0 (1)  
Actuarial gain arising from demographic assumptions 0 (4)  
Actuarial loss arising from financial assumptions 0 0  
Actuarial gain (loss) arising from experience adjustments (1) (2)  
Effect of translation on US plans (1) (1)  
Defined benefit obligation, ending of period CAD 27 CAD 27 CAD 32