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Employee Future Benefits - Fair Value of Plan Assets (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2023
CAD ($)
Dec. 31, 2022
CAD ($)
Dec. 31, 2021
CAD ($)
Disclosure of net defined benefit liability (asset) [line items]        
Net asset, beginning of period   $ (158)    
Administration expenses   (1) $ (1) $ (1)
Net asset, ending of period   (162) (158)  
Voluntary contribution $ 3 4 35  
Plan assets        
Disclosure of net defined benefit liability (asset) [line items]        
Net asset, beginning of period   289 353  
Interest on plan assets   14 9  
Net loss on plan assets   14 (55)  
Contributions   13 44  
Benefits paid   (44) (62)  
Change in foreign exchange rates   (1) 1  
Net asset, ending of period   284 289 353
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   (71) (71)  
Registered | Plan assets        
Disclosure of net defined benefit liability (asset) [line items]        
Net asset, beginning of period   274 339  
Interest on plan assets   13 9  
Net loss on plan assets   15 (55)  
Contributions   5 38  
Benefits paid   (36) (57)  
Change in foreign exchange rates   (1) 1  
Net asset, ending of period   269 274 339
Supplemental        
Disclosure of net defined benefit liability (asset) [line items]        
Net asset, beginning of period   (70)    
Administration expenses   0 0 0
Net asset, ending of period   (74) (70)  
Supplemental | Plan assets        
Disclosure of net defined benefit liability (asset) [line items]        
Net asset, beginning of period   15 14  
Interest on plan assets   1 0  
Net loss on plan assets   (1) 0  
Contributions   6 6  
Benefits paid   (6) (5)  
Change in foreign exchange rates   0 0  
Net asset, ending of period   15 15 14
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   (17) (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 loss on plan assets   0 0  
Contributions   2 0  
Benefits paid   (2) 0  
Change in foreign exchange rates   0 0  
Net asset, ending of period   $ 0 $ 0 $ 0