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Employee Future Benefits - Costs Recognized (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost $ 3 $ 2 $ 2
Administration expenses 1 1 1
Defined benefit expense 10 10 10
Defined contribution expense 12 11 11
Net expense 22 21 21
Interest cost on defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Interest cost on defined benefit obligation 19 21 16
Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Administration expenses 1 1  
Interest on plan assets (13) (14) (9)
Registered      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 1 1 1
Administration expenses 1 1 1
Defined benefit expense 4 5 6
Defined contribution expense 12 11 11
Net expense 16 16 17
Registered | Interest cost on defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Interest cost on defined benefit obligation 14 16 13
Registered | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Administration expenses 1 1  
Interest on plan assets (12) (13) (9)
Supplemental      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 1 1 1
Administration expenses 0 0 0
Defined benefit expense 4 4 4
Defined contribution expense 0 0 0
Net expense 4 4 4
Supplemental | Interest cost on defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Interest cost on defined benefit obligation 4 4 3
Supplemental | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Administration expenses 0 0  
Interest on plan assets (1) (1) 0
Other      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 1 0 0
Administration expenses 0 0 0
Defined benefit expense 2 1 0
Defined contribution expense 0 0 0
Net expense 2 1 0
Other | Interest cost on defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Interest cost on defined benefit obligation 1 1 0
Other | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Administration expenses 0 0  
Interest on plan assets $ 0 $ 0 $ 0