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Employee Future Benefits - Defined Benefit Obligation (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, beginning of period $ 238    
Current service cost 10 $ 12 $ 10
Actuarial gain arising from demographic assumptions (26) 15  
Defined benefit obligation, ending of period 278 238  
Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, beginning of period 619    
Interest cost 23 22 24
Defined benefit obligation, ending of period 664 619  
Registered      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, beginning of period 146    
Current service cost 7 9 7
Defined benefit obligation, ending of period 170 146  
Registered | Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, beginning of period 514 561  
Current service cost 7 9  
Interest cost 19 18 20
Benefits paid (51) (42)  
Curtailment and amendment gain (3)    
Actuarial gain arising from demographic assumptions 0 0  
Actuarial loss arising from financial assumptions 57 (35)  
Actuarial gain (loss) arising from experience adjustments 2 0  
Effect of translation on US plans (2) 3  
Defined benefit obligation, ending of period 543 514 561
Supplemental Pension Plan      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, beginning of period 67    
Current service cost 2 2 2
Defined benefit obligation, ending of period 86 67  
Supplemental Pension Plan | Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, beginning of period 80 87  
Current service cost 2 2  
Interest cost 3 3 3
Benefits paid (4) (5)  
Curtailment and amendment gain 0    
Actuarial gain arising from demographic assumptions 0 0  
Actuarial loss arising from financial assumptions 9 (7)  
Actuarial gain (loss) arising from experience adjustments 9 0  
Effect of translation on US plans 0 0  
Defined benefit obligation, ending of period 99 80 87
Other      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, beginning of period 25    
Current service cost 1 1 1
Defined benefit obligation, ending of period 22 25  
Other | Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, beginning of period 25 27  
Current service cost 1 1  
Interest cost 1 1 1
Benefits paid (1) (1)  
Curtailment and amendment gain 0    
Actuarial gain arising from demographic assumptions 2 0  
Actuarial loss arising from financial assumptions 2 (2)  
Actuarial gain (loss) arising from experience adjustments (4) (1)  
Effect of translation on US plans 0 0  
Defined benefit obligation, ending of period 22 25 27
Total | Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, beginning of period 619 675  
Current service cost 10 12  
Interest cost 23 22  
Benefits paid (56) (48)  
Curtailment and amendment gain (3)    
Actuarial gain arising from demographic assumptions 2 0  
Actuarial loss arising from financial assumptions 68 (44)  
Actuarial gain (loss) arising from experience adjustments 7 (1)  
Effect of translation on US plans (2) 3  
Defined benefit obligation, ending of period $ 664 $ 619 $ 675