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Risk Management - Net Fair Value of Risk Management Positions (Detail)
MMBbls in Millions, $ in Millions
Sep. 30, 2021
CAD ($)
MMBbls
$ / bbl
Dec. 31, 2020
CAD ($)
Disclosure of Derivative Financial Instruments [Line Items]    
Fair Value Asset (Liability) $ (292) $ (53)
Crude Oil and Condensate Contracts    
Disclosure of Derivative Financial Instruments [Line Items]    
Fair Value Asset (Liability) $ (292)  
Minimum | Crude Oil and Condensate Contracts    
Disclosure of Derivative Financial Instruments [Line Items]    
Financial instruments, term 1 month  
Maximum | Crude Oil and Condensate Contracts    
Disclosure of Derivative Financial Instruments [Line Items]    
Financial instruments, term 15 months  
WTI Fixed - Sell | Crude Oil and Condensate Contracts    
Disclosure of Derivative Financial Instruments [Line Items]    
Notional Volumes | MMBbls 55.9  
Weighted Average Price | $ / bbl 67.29  
Fair Value Asset (Liability) $ (495)  
WTI Fixed - Buy | Crude Oil and Condensate Contracts    
Disclosure of Derivative Financial Instruments [Line Items]    
Notional Volumes | MMBbls 21.1  
Weighted Average Price | $ / bbl 67.15  
Fair Value Asset (Liability) $ 185  
Other financial positions | Crude Oil and Condensate Contracts    
Disclosure of Derivative Financial Instruments [Line Items]    
Fair Value Asset (Liability) $ 18