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Financial Instruments - Summary of Urealized Risk Management Positions (Detail) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Risk Management Net | $ 53 |
Level 2 of Fair Value Hierarchy [Member] |  |
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Risk Management Net | (53) | $ 3
Level 2 of Fair Value Hierarchy [Member] | Commodity Price Risk [Member] | Crude Oil, Natural Gas and Condensate [Member] |  |
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Risk Management Asset | 5 | 5
Risk Management Liability | 58 | 2
Risk Management Net | $ (53) | $ 3

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