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Risk Management - Impact of Fluctuating Commodity Prices and Interest Rates on Company'S Open Risk Management Positions (Details)
$ in Millions
Sep. 30, 2025
CAD ($)
$ / bbl
$ / $
$ / MWh
$ / MMcf
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
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 $ (6)
Decrease $ 6
Commodity price risk | WCS Hardisty  
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]  
Sensitivity Range | $ / bbl 2.50
Increase $ 0
Decrease $ 0
Commodity price risk | Refined Products  
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]  
Sensitivity Range | $ / bbl 10.00
Increase $ 0
Decrease $ 0
Commodity price risk | Natural Gas Commodity Price  
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 | Natural Gas Contracts  
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]  
Sensitivity Range | $ / MMcf 0.25
Increase $ 0
Decrease $ 0
Commodity price risk | Power Commodity  
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]  
Sensitivity Range | $ / MWh 10.00
Increase $ 42
Decrease $ (42)
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 $ 45
Decrease $ (52)