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Employee Future Benefits - Status of Plans (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) $ (162) $ (158)  
Accrued current liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (7) (8)  
Other long-term liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (155) (150)  
Fair value of plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) 284 289 $ 353
Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (446) (447)  
Registered      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (71) (71)  
Registered | Accrued current liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (1) (1)  
Registered | Other long-term liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (70) (70)  
Registered | Fair value of plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) 269 274 339
Registered | Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (340) (345) (469)
Supplemental      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (74) (70)  
Supplemental | Accrued current liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (5) (6)  
Supplemental | Other long-term liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (69) (64)  
Supplemental | Fair value of plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) 15 15 14
Supplemental | Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (89) (85) (101)
Other      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (17) (17)  
Other | Accrued current liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (1) (1)  
Other | Other long-term liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (16) (16)  
Other | Fair value of plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) 0 0 0
Other | Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) $ (17) $ (17) $ (23)