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Employee Future Benefits - Defined Benefit Obligation (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, beginning of period $ 158  
Actuarial loss arising from demographic assumptions 5 $ (37)
Defined benefit obligation, ending of period 162 158
Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, beginning of period 447  
Defined benefit obligation, ending of period 446 447
Registered    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, beginning of period 71  
Defined benefit obligation, ending of period 71 71
Registered | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, beginning of period 345 469
Current service cost 1 1
Interest cost 16 13
Benefits paid (36) (57)
Actuarial loss arising from demographic assumptions 1  
Actuarial gain arising from financial assumptions 12 (83)
Actuarial loss arising from experience adjustments 2 1
Change in foreign exchange rates (1) 1
Defined benefit obligation, ending of period 340 345
Supplemental    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, beginning of period 70  
Defined benefit obligation, ending of period 74 70
Supplemental | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, beginning of period 85 101
Current service cost 1 1
Interest cost 4 3
Benefits paid (6) (5)
Actuarial loss arising from demographic assumptions 0  
Actuarial gain arising from financial assumptions 4 (22)
Actuarial loss arising from experience adjustments 1 7
Change in foreign exchange rates 0 0
Defined benefit obligation, ending of period 89 85
Other    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, beginning of period 17  
Defined benefit obligation, ending of period 17 17
Other | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, beginning of period 17 23
Current service cost 0 0
Interest cost 1 0
Benefits paid (2) 1
Actuarial loss arising from demographic assumptions 0  
Actuarial gain arising from financial assumptions 1 (5)
Actuarial loss arising from experience adjustments 0 (2)
Change in foreign exchange rates 0 0
Defined benefit obligation, ending of period 17 17
Total | Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, beginning of period 447 593
Current service cost 2 2
Interest cost 21 16
Benefits paid (44) (61)
Actuarial loss arising from demographic assumptions 1  
Actuarial gain arising from financial assumptions 17 (110)
Actuarial loss arising from experience adjustments 3 6
Change in foreign exchange rates (1) 1
Defined benefit obligation, ending of period $ 446 $ 447