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Employee Future Benefits - Defined Benefit Obligation (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, beginning of period $ 294    
Current service cost 6 $ 8 $ 10
Defined benefit obligation, ending of period 240 294  
Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, beginning of period 675    
Interest cost 14 20 23
Defined benefit obligation, ending of period 593 675  
Registered      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, beginning of period 175    
Current service cost 3 5 7
Defined benefit obligation, ending of period 130 175  
Registered | Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, beginning of period 542 543  
Current service cost 3 5  
Interest cost 12 16 19
Benefits paid (54) (45)  
Curtailment and amendment gain (7) (2)  
Actuarial loss arising from financial assumptions (26) 43  
Actuarial gain arising from experience adjustments (1) (17)  
Effect of translation on US plans   (1)  
Defined benefit obligation, ending of period 469 542 543
Supplemental Pension Plan      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, beginning of period 95    
Current service cost 2 2 2
Defined benefit obligation, ending of period 87 95  
Supplemental Pension Plan | Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, beginning of period 109 99  
Current service cost 2 2  
Interest cost 2 3 3
Benefits paid (5) (5)  
Curtailment and amendment gain 0 0  
Actuarial loss arising from financial assumptions (7) 10  
Actuarial gain arising from experience adjustments 0 0  
Effect of translation on US plans   0  
Defined benefit obligation, ending of period 101 109 99
Other      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, beginning of period 24    
Current service cost 1 1 1
Defined benefit obligation, ending of period 23 24  
Other | Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, beginning of period 24 22  
Current service cost 1 1  
Interest cost 0 1 1
Benefits paid (1) (1)  
Curtailment and amendment gain 0 0  
Actuarial loss arising from financial assumptions (1) 2  
Actuarial gain arising from experience adjustments 0 0  
Effect of translation on US plans   (1)  
Defined benefit obligation, ending of period 23 24 22
Total | Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, beginning of period 675 664  
Current service cost 6 8  
Interest cost 14 20  
Benefits paid (60) (51)  
Curtailment and amendment gain (7) (2)  
Actuarial loss arising from financial assumptions (34) 55  
Actuarial gain arising from experience adjustments (1) (17)  
Effect of translation on US plans   (2)  
Defined benefit obligation, ending of period $ 593 $ 675 $ 664