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Financial Instruments - Carrying Amounts and Reconciliation of Derivative Financial Instruments (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about hedging instruments [line items]      
Current portion of other long-term assets $ 3 $ 5  
Current portion of other long-term liabilities (3) (72)  
Other long-term assets 6 135  
Other long-term liabilities 0 (13)  
Derivative financial asset (liability), net 6 55 $ (24)
Natural Gas      
Disclosure of detailed information about hedging instruments [line items]      
Derivatives held for trading, asset (liability) 3 (41)  
Crude oil and NGLs      
Disclosure of detailed information about hedging instruments [line items]      
Derivatives held for trading, asset (liability) 0 (10)  
Foreign currency forward contracts      
Disclosure of detailed information about hedging instruments [line items]      
Derivatives held for trading, asset (liability) 3 (13)  
Foreign currency forward contracts | Cash flow hedges      
Disclosure of detailed information about hedging instruments [line items]      
Cash flow hedges, asset (liability) 0 (21)  
Cross currency swaps | Cash flow hedges      
Disclosure of detailed information about hedging instruments [line items]      
Cash flow hedges, asset (liability) $ 0 $ 140