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Employee Future Benefits - Fair Value of Plan Assets (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
CAD ($)
Dec. 31, 2023
CAD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CAD ($)
Disclosure of net defined benefit liability (asset) [line items]        
Net asset, beginning of period $ (162)      
Administration expenses (1) $ (1)   $ (1)
Net asset, ending of period (154) (162)    
Voluntary contribution 0 4 $ 3  
Plan assets        
Disclosure of net defined benefit liability (asset) [line items]        
Net asset, beginning of period 284 289    
Interest on plan assets 13 14    
Net return on plan assets 12 14    
Contributions 8 13    
Benefits paid (37) (44)    
Administration expenses (1) (1)    
Effect of settlement from annuitization of the U.S. defined benefit plan (Note 27) (23)      
Change in foreign exchange rates 1 (1)    
Net asset, ending of period 257 284   289
Registered        
Disclosure of net defined benefit liability (asset) [line items]        
Net asset, beginning of period (71)      
Administration expenses (1) (1)   (1)
Net asset, ending of period (62) (71)    
Registered | Plan assets        
Disclosure of net defined benefit liability (asset) [line items]        
Net asset, beginning of period 269 274    
Interest on plan assets 12 13    
Net return on plan assets 13 15    
Contributions 1 5    
Benefits paid (31) (36)    
Administration expenses (1) (1)    
Effect of settlement from annuitization of the U.S. defined benefit plan (Note 27) (23)      
Change in foreign exchange rates 1 (1)    
Net asset, ending of period 241 269   274
Supplemental        
Disclosure of net defined benefit liability (asset) [line items]        
Net asset, beginning of period (74)      
Administration expenses 0 0   0
Net asset, ending of period (74) (74)    
Supplemental | Plan assets        
Disclosure of net defined benefit liability (asset) [line items]        
Net asset, beginning of period 15 15    
Interest on plan assets 1 1    
Net return on plan assets (1) (1)    
Contributions 6 6    
Benefits paid (5) (6)    
Administration expenses 0 0    
Effect of settlement from annuitization of the U.S. defined benefit plan (Note 27) 0      
Change in foreign exchange rates 0 0    
Net asset, ending of period 16 15   15
Other        
Disclosure of net defined benefit liability (asset) [line items]        
Net asset, beginning of period (17)      
Administration expenses 0 0   0
Net asset, ending of period (18) (17)    
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 on plan assets 0 0    
Contributions 1 2    
Benefits paid (1) (2)    
Administration expenses 0 0    
Effect of settlement from annuitization of the U.S. defined benefit plan (Note 27) 0      
Change in foreign exchange rates 0 0    
Net asset, ending of period $ 0 $ 0   $ 0