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Financial Instruments - Carrying Amounts and Reconciliation of Derivative Financial Instruments (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
MMBTU
Dec. 31, 2023
CAD ($)
Dec. 31, 2022
CAD ($)
Dec. 31, 2021
CAD ($)
Disclosure of detailed information about hedging instruments [line items]        
Derivatives held for trading, asset (liability)   $ 9 $ 6  
Current portion of other long-term assets   12 3  
Current portion of other long-term liabilities   (4) (3)  
Other long-term assets   1 6  
Derivative financial asset (liability), net   9 6 $ 55
Derivative, volume per day | MMBTU 50,000      
Derivative, AECO fixed price $ 1.82      
Natural Gas        
Disclosure of detailed information about hedging instruments [line items]        
Derivatives held for trading, asset (liability)   (3) 3  
Foreign currency forward contracts        
Disclosure of detailed information about hedging instruments [line items]        
Derivatives held for trading, asset (liability)   $ 12 $ 3