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Risk Management - Impact of Fluctuating Commodity Prices and Interest Rates on Company'S Open Risk Management Positions (Detail)
$ in Millions
Sep. 30, 2023
CAD ($)
$ / bbl
$ / MMcf
$ / $
$ / MWh
Commodity price risk | WCS and Condensate Differential  
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]  
Sensitivity Range | $ / bbl 2.50
Increase $ 2
Decrease $ (2)
Commodity price risk | WCS Hardisty  
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]  
Sensitivity Range | $ / bbl 5.00
Increase $ (23)
Decrease $ 23
Commodity price risk | Refined Products  
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]  
Sensitivity Range | $ / bbl 10.00
Increase $ (5)
Decrease $ 5
Commodity price risk | Natural Gas Contracts  
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]  
Sensitivity Range | $ / MMcf 0.50
Increase $ 1
Decrease $ (1)
Commodity price risk | Power Commodity  
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]  
Sensitivity Range | $ / MWh 20.00
Increase $ 109
Decrease $ (109)
Commodity price risk | Crude Oil Contracts  
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]  
Sensitivity Range | $ / bbl 10.00
Increase $ 0
Decrease $ 0
Currency risk | U.S. to Canadian Dollar Exchange Rate  
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]  
Sensitivity Range | $ / $ 0.05
Increase $ 26
Decrease $ (30)