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Employee Future Benefits - Fair Value of Plan Assets (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]      
Net asset, beginning of period $ (240)    
Administration expenses (1) $ (1) $ (1)
Net asset, ending of period (158) (240)  
Voluntary contribution 35    
Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Net asset, beginning of period 353 381  
Interest on plan assets 9 8  
Net return (loss) on plan assets (55) 13  
Contributions 44 12  
Benefits paid (62) (60)  
Change in foreign exchange rates 1    
Net asset, ending of period 289 353 381
Registered      
Disclosure of net defined benefit liability (asset) [line items]      
Net asset, beginning of period (130)    
Administration expenses (1) (1) (1)
Net asset, ending of period (71) (130)  
Registered | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Net asset, beginning of period 339 367  
Interest on plan assets 9 8  
Net return (loss) on plan assets (55) 14  
Contributions 38 5  
Benefits paid (57) (54)  
Change in foreign exchange rates 1    
Net asset, ending of period 274 339 367
Supplemental      
Disclosure of net defined benefit liability (asset) [line items]      
Net asset, beginning of period (87)    
Administration expenses 0 0 0
Net asset, ending of period (70) (87)  
Supplemental | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Net asset, beginning of period 14 14  
Interest on plan assets 0 0  
Net return (loss) on plan assets 0 (1)  
Contributions 6 6  
Benefits paid (5) (5)  
Change in foreign exchange rates 0    
Net asset, ending of period 15 14 14
Other      
Disclosure of net defined benefit liability (asset) [line items]      
Net asset, beginning of period (23)    
Administration expenses 0 0 0
Net asset, ending of period (17) (23)  
Other | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Net asset, beginning of period 0 0  
Interest on plan assets 0 0  
Net return (loss) on plan assets 0 0  
Contributions 0 1  
Benefits paid 0 (1)  
Change in foreign exchange rates 0    
Net asset, ending of period $ 0 $ 0 $ 0