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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, 2021 CAD ($) $ / bbl
Commodity price risk | Crude Oil Contracts
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]
Sensitivity Range | $ / bbl	5.00
Increase	$ (199)
Decrease	$ 199
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	$ 5
Decrease	$ (5)
Commodity price risk | Refined Products
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]
Sensitivity Range | $ / bbl	5.00
Increase	$ (11)
Decrease	$ 11
Currency risk | U.S. to Canadian Dollar Exchange Rate
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]
Sensitivity Range | $ / bbl	0.05
Increase	$ 11
Decrease	$ (12)

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- Definition

Theoretical impact to profit loss from decrease in commodity sensitivity.

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- Definition

Theoretical impact to profit loss from increase in commodity sensitivity.

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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