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Financial Instruments - Summary of Urealized Risk Management Positions (Detail) - CAD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
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Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Risk Management Asset | $ 34 | $ 48
Risk Management Liability | 33 | 116
Risk Management Net Asset (Liability) | 1 | (68)
Renewable Power Contracts |  |
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Risk Management Net Asset (Liability) | 1 |
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 | 30 | 46
Risk Management Liability | 29 | 116
Risk Management Net Asset (Liability) | 1 | (70)
Level 2 of fair value hierarchy | Currency risk | Foreign Exchange Rate Contracts |  |
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Risk Management Asset | 1 | 2
Risk Management Liability | 0 | 0
Risk Management Net Asset (Liability) | 1 | 2
Level 3 of fair value hierarchy |  |
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Risk Management Asset | 53 | 53
Level 3 of fair value hierarchy | Commodity price risk | Renewable Power Contracts |  |
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Risk Management Asset | 3 | 0
Risk Management Liability | 4 | 0
Risk Management Net Asset (Liability) | $ (1) | $ 0

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