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Risk Management - Net Fair Value of Risk Management Positions (Detail)
MMBbls in Millions, $ in Millions
Sep. 30, 2023
CAD ($)
$ / bbl
MMBbls
Dec. 31, 2022
CAD ($)
Disclosure of Derivative Financial Instruments [Line Items]    
Fair Value Asset (Liability) $ (27) $ 46
Power Swap Contracts    
Disclosure of Derivative Financial Instruments [Line Items]    
Fair Value Asset (Liability) 2  
Renewable Power Contracts    
Disclosure of Derivative Financial Instruments [Line Items]    
Fair Value Asset (Liability) 21  
Foreign Exchange Contracts    
Disclosure of Derivative Financial Instruments [Line Items]    
Fair Value Asset (Liability) $ (1)  
WTI Fixed - Sell | Crude Oil and Condensate Contracts    
Disclosure of Derivative Financial Instruments [Line Items]    
Notional Volumes | MMBbls 6.2  
Weighted Average Price | $ / bbl 83.06  
Fair Value Asset (Liability) $ (52)  
WTI Fixed - Buy | Crude Oil and Condensate Contracts    
Disclosure of Derivative Financial Instruments [Line Items]    
Notional Volumes | MMBbls 2.6  
Weighted Average Price | $ / bbl 86.23  
Fair Value Asset (Liability) $ 13  
Other financial positions    
Disclosure of Derivative Financial Instruments [Line Items]    
Fair Value Asset (Liability) $ (10)