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Financial Instruments - Summary of Unrealized Risk Management Positions (Detail) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items]      
Risk Management Net Asset (Liability) $ 46 $ (68) $ (53)
Power Swap Contracts      
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items]      
Risk Management Net Asset (Liability) (6)    
Renewable Power Contracts      
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items]      
Risk Management Net Asset (Liability) 90    
Level 2 of fair value hierarchy      
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items]      
Risk Management Net Asset (Liability) (44) (68)  
Level 2 of fair value hierarchy | Commodity price risk      
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items]      
Risk Management Asset 93 48  
Risk Management Liability 47 116  
Risk Management Net Asset (Liability) 46 (68)  
Level 2 of fair value hierarchy | Commodity price risk | Crude Oil, Natural Gas, Condensate and Refined Products      
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items]      
Risk Management Asset 2 46  
Risk Management Liability 40 116  
Risk Management Net Asset (Liability) (38) (70)  
Level 2 of fair value hierarchy | Commodity price risk | Power Swap Contracts      
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items]      
Risk Management Asset 1 0  
Risk Management Liability 7 0  
Risk Management Net Asset (Liability) (6) 0  
Level 2 of fair value hierarchy | Commodity price risk | Renewable Power Contracts      
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items]      
Risk Management Asset 90 0  
Risk Management Liability 0 0  
Risk Management Net Asset (Liability) 90 0  
Level 2 of fair value hierarchy | Currency risk | Exchange Rate Contracts      
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items]      
Risk Management Asset 0 2  
Risk Management Liability 0 0  
Risk Management Net Asset (Liability) $ 0 $ 2