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Risk Management - Net Fair Value of Risk Management Positions (Detail)
MMBbls in Millions, $ in Millions
Jun. 30, 2022
CAD ($)
MMBbls
$ / bbl
Dec. 31, 2021
CAD ($)
Disclosure of Derivative Financial Instruments [Line Items]    
Fair Value Asset (Liability) $ 1 $ (68)
Foreign Exchange Contracts    
Disclosure of Derivative Financial Instruments [Line Items]    
Fair Value Asset (Liability) $ 1  
Minimum    
Disclosure of Derivative Financial Instruments [Line Items]    
Financial instruments, term 1 month  
Maximum    
Disclosure of Derivative Financial Instruments [Line Items]    
Financial instruments, term 11 months  
WTI Fixed - Sell | Crude Oil and Condensate Contracts    
Disclosure of Derivative Financial Instruments [Line Items]    
Notional Volumes | MMBbls 4.0  
Weighted Average Price | $ / bbl 104.17  
Fair Value Asset (Liability) $ 11  
WTI Fixed - Buy | Crude Oil and Condensate Contracts    
Disclosure of Derivative Financial Instruments [Line Items]    
Notional Volumes | MMBbls 1.6  
Weighted Average Price | $ / bbl 104.75  
Fair Value Asset (Liability) $ (1)  
Other financial positions    
Disclosure of Derivative Financial Instruments [Line Items]    
Fair Value Asset (Liability) $ (10)