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Employee Future Benefits - Costs Recognized (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost $ 2 $ 6 $ 8
Administration expenses 1 1 1
Defined benefit expense 10 6 15
Defined contribution expense 11 8 9
Net expense 21 14 24
Interest cost on defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Interest cost on defined benefit obligation 16 14 20
Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Interest on plan assets (9) (8) (12)
Curtailment and amendment gain   (7) (2)
Registered      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 1 3 5
Administration expenses 1 1 1
Defined benefit expense 6 1 9
Defined contribution expense 11 8 9
Net expense 17 9 18
Registered | Interest cost on defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Interest cost on defined benefit obligation 13 12 16
Curtailment and amendment gain   (7)  
Registered | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Interest on plan assets (9) (8) (11)
Curtailment and amendment gain   (7) (2)
Supplemental      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 1 2 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 3 2 3
Curtailment and amendment gain   0  
Supplemental | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Interest on plan assets 0 0 (1)
Curtailment and amendment gain   0 0
Other      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 0 1 1
Administration expenses 0 0 0
Defined benefit expense 0 1 2
Defined contribution expense 0 0 0
Net expense 0 1 2
Other | Interest cost on defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Interest cost on defined benefit obligation 0 0 1
Curtailment and amendment gain   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 $ 0