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Employee Future Benefits - Defined Benefit Obligation (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Pension And Other Post-Employment Benefit Plans [Roll Forward]    
Defined benefit obligation, beginning of period $ 162  
Actuarial gain arising from demographic assumptions (9) $ 5
Defined benefit obligation, ending of period $ 154 162
Weighted average duration of defined benefit obligation 9 years 9 months 18 days  
Present value of defined benefit obligation    
Defined Benefit Pension And Other Post-Employment Benefit Plans [Roll Forward]    
Defined benefit obligation, beginning of period $ 446  
Defined benefit obligation, ending of period 411 446
Registered    
Defined Benefit Pension And Other Post-Employment Benefit Plans [Roll Forward]    
Defined benefit obligation, beginning of period 71  
Defined benefit obligation, ending of period 62 71
Registered | Present value of defined benefit obligation    
Defined Benefit Pension And Other Post-Employment Benefit Plans [Roll Forward]    
Defined benefit obligation, beginning of period 340 345
Current service cost 1 1
Interest cost 14 16
Benefits paid (31) (36)
Actuarial gain arising from demographic assumptions   1
Actuarial gain arising from financial assumptions 1 12
Actuarial gain arising from experience adjustments 0 2
Effect of settlement from the termination of the U.S. defined benefit plan (Note 27) (23)  
Change in foreign exchange rates 1 (1)
Defined benefit obligation, ending of period 303 340
Supplemental    
Defined Benefit Pension And Other Post-Employment Benefit Plans [Roll Forward]    
Defined benefit obligation, beginning of period 74  
Defined benefit obligation, ending of period 74 74
Supplemental | Present value of defined benefit obligation    
Defined Benefit Pension And Other Post-Employment Benefit Plans [Roll Forward]    
Defined benefit obligation, beginning of period 89 85
Current service cost 0 1
Interest cost 4 4
Benefits paid (5) (6)
Actuarial gain arising from demographic assumptions   0
Actuarial gain arising from financial assumptions 1 4
Actuarial gain arising from experience adjustments 1 1
Effect of settlement from the termination of the U.S. defined benefit plan (Note 27) 0  
Change in foreign exchange rates 0 0
Defined benefit obligation, ending of period 90 89
Other    
Defined Benefit Pension And Other Post-Employment Benefit Plans [Roll Forward]    
Defined benefit obligation, beginning of period 17  
Defined benefit obligation, ending of period 18 17
Other | Present value of defined benefit obligation    
Defined Benefit Pension And Other Post-Employment Benefit Plans [Roll Forward]    
Defined benefit obligation, beginning of period 17 17
Current service cost 1 0
Interest cost 1 1
Benefits paid (1) (2)
Actuarial gain arising from demographic assumptions   0
Actuarial gain arising from financial assumptions 0 1
Actuarial gain arising from experience adjustments 0 0
Effect of settlement from the termination of the U.S. defined benefit plan (Note 27) 0  
Change in foreign exchange rates 0 0
Defined benefit obligation, ending of period 18 17
Total | Present value of defined benefit obligation    
Defined Benefit Pension And Other Post-Employment Benefit Plans [Roll Forward]    
Defined benefit obligation, beginning of period 446 447
Current service cost 2 2
Interest cost 19 21
Benefits paid (37) (44)
Actuarial gain arising from demographic assumptions   1
Actuarial gain arising from financial assumptions 2 17
Actuarial gain arising from experience adjustments 1 3
Effect of settlement from the termination of the U.S. defined benefit plan (Note 27) (23)  
Change in foreign exchange rates 1 (1)
Defined benefit obligation, ending of period $ 411 $ 446