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Financial Instruments - Summary of Urealized Risk Management Positions (Detail) - CAD ($) $ in Millions | Dec. 31, 2021 | 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 Asset (Liability) | $ (68) | $ (53) | $ 3
Level 2 of fair value hierarchy |  |  |
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Risk Management Net Asset (Liability) | (68) | (53) |
Level 2 of fair value hierarchy | Commodity price risk |  |  |
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Risk Management Asset | 48 | 5 |
Risk Management Liability | 116 | 58 |
Risk Management Net Asset (Liability) | (68) | (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 | 46 | 5 |
Risk Management Liability | 116 | 58 |
Risk Management Net Asset (Liability) | (70) | (53) |
Level 2 of fair value hierarchy | Commodity price risk | Exchange Rate Contracts |  |  |
Disclosure Of Recurring Fair Value Measurement Of Assets And Liabilities [Line Items] |  |  |
Risk Management Asset | 2 | 0 |
Risk Management Liability | 0 | 0 |
Risk Management Net Asset (Liability) | $ 2 | $ 0 |

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