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Employee Future Benefits - Costs Recognized (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost $ 2 $ 2 $ 6
Administration expenses 1 1 1
Defined benefit expense 10 10 6
Defined contribution expense 11 11 8
Net expense 21 21 14
Interest cost on defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Interest cost on defined benefit obligation 21 16 14
Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Interest on plan assets (14) (9) (8)
Curtailment and amendment gain     (7)
Registered      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 1 1 3
Administration expenses 1 1 1
Defined benefit expense 5 6 1
Defined contribution expense 11 11 8
Net expense 16 17 9
Registered | Interest cost on defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Interest cost on defined benefit obligation 16 13 12
Registered | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Interest on plan assets (13) (9) (8)
Curtailment and amendment gain     (7)
Supplemental      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 1 1 2
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 3 2
Supplemental | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Interest on plan assets (1) 0 0
Curtailment and amendment gain     0
Other      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 0 0 1
Administration expenses 0 0 0
Defined benefit expense 1 0 1
Defined contribution expense 0 0 0
Net expense 1 0 1
Other | Interest cost on defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Interest cost on defined benefit obligation 1 0 0
Other | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Interest on plan assets $ 0 $ 0 0
Curtailment and amendment gain     $ 0