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Employee Future Benefits - Costs Recognized (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost $ 6 $ 8 $ 10
Administration expenses 1 1 2
Defined benefit expense 6 15 19
Defined contribution expense 8 9 9
Net expense 14 24 28
Defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Interest cost 14 20 23
Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Interest cost (8) (12) (13)
Curtailment and amendment gain (7) (2) (3)
Registered      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 3 5 7
Administration expenses 1 1 2
Defined benefit expense 1 9 13
Defined contribution expense 8 9 9
Net expense 9 18 22
Registered | Defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 3 5  
Interest cost 12 16 19
Curtailment and amendment gain (7) (2)  
Registered | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Interest cost (8) (11) (12)
Curtailment and amendment gain (7) (2) (3)
Supplemental Pension Plan      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 2 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 Pension Plan | Defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 2 2  
Interest cost 2 3 3
Curtailment and amendment gain 0 0  
Supplemental Pension Plan | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Interest cost 0 (1) (1)
Curtailment and amendment gain 0 0 0
Other      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 1 1 1
Administration expenses 0 0 0
Defined benefit expense 1 2 2
Defined contribution expense 0 0 0
Net expense 1 2 2
Other | Defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 1 1  
Interest cost 0 1 1
Curtailment and amendment gain 0 0  
Other | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Interest cost 0 0 0
Curtailment and amendment gain $ 0 $ 0 $ 0