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Financial Instruments - Summary of Urealized Risk Management Positions (Detail) - CAD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items]
Risk Management Net Asset (Liability)	$ (292)	$ (53)
Level 2 of fair value hierarchy
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items]
Risk Management Net Asset (Liability)	(292)	(53)
Level 2 of fair value hierarchy | Commodity price risk | Crude Oil, Natural Gas, Condensate and Refined Products
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items]
Risk Management Asset	24	5
Risk Management Liability	316	58
Risk Management Net Asset (Liability)	$ (292)	$ (53)

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Disclosure of recurring fair value measurement of assets and liabilities.

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Fair value of derivative financial instruments net.

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- Definition

The fair value of financial assets. [Refer: At fair value [member]; Financial assets]

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