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Employee Future Benefits - Status of Plans (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) $ (158) $ (240)  
Accrued current liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (8) (12)  
Other long-term liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (150) (228)  
Fair value of plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) 289 353 $ 381
Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (447) (593)  
Registered      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (71) (130)  
Registered | Accrued current liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (1) (4)  
Registered | Other long-term liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (70) (126)  
Registered | Fair value of plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) 274 339 367
Registered | Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (345) (469) (542)
Supplemental      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (70) (87)  
Supplemental | Accrued current liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (6) (6)  
Supplemental | Other long-term liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (64) (81)  
Supplemental | Fair value of plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) 15 14 14
Supplemental | Present value of defined benefit obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (85) (101) (109)
Other      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (17) (23)  
Other | Accrued current liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (1) (2)  
Other | Other long-term liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) (16) (21)  
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) $ (23) $ (24)