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Employee Future Benefits - Defined Benefit Obligation (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, beginning of period $ 247    
Current service cost 12 $ 10 $ 11
Actuarial gain arising from demographic assumptions (15) 6  
Defined benefit obligation, ending of period 238 247  
Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, beginning of period 675 663  
Current service cost 12 10  
Interest cost 22 24 25
Benefits paid (48) (55)  
Actuarial gain arising from demographic assumptions   5  
Actuarial loss arising from financial assumptions (44) 29  
Actuarial gain (loss) arising from experience adjustments (1) 2  
Effect of translation on US plans 3 (3)  
Defined benefit obligation, ending of period 619 675 663
Registered      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, beginning of period 145    
Current service cost 9 7 7
Defined benefit obligation, ending of period 146 145  
Registered | Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, beginning of period 561 554  
Current service cost 9 7  
Interest cost 18 20 21
Benefits paid (42) (51)  
Actuarial gain arising from demographic assumptions   4  
Actuarial loss arising from financial assumptions (35) 26  
Actuarial gain (loss) arising from experience adjustments 0 3  
Effect of translation on US plans 3 (2)  
Defined benefit obligation, ending of period 514 561 554
Supplemental      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, beginning of period 75    
Current service cost 2 2 2
Defined benefit obligation, ending of period 67 75  
Supplemental | Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, beginning of period 87 82  
Current service cost 2 2  
Interest cost 3 3 3
Benefits paid (5) (4)  
Actuarial gain arising from demographic assumptions   1  
Actuarial loss arising from financial assumptions (7) 3  
Actuarial gain (loss) arising from experience adjustments 0 0  
Effect of translation on US plans 0 0  
Defined benefit obligation, ending of period 80 87 82
Other      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, beginning of period 27    
Current service cost 1 1 2
Defined benefit obligation, ending of period 25 27  
Other | Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, beginning of period 27 27  
Current service cost 1 1  
Interest cost 1 1 1
Benefits paid (1) 0  
Actuarial gain arising from demographic assumptions   0  
Actuarial loss arising from financial assumptions (2) 0  
Actuarial gain (loss) arising from experience adjustments (1) (1)  
Effect of translation on US plans 0 (1)  
Defined benefit obligation, ending of period $ 25 $ 27 $ 27