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Financial Instruments - Summary of Fair Value Hierarchy for Risk Management Assets and Liabilities Carried at Fair Value (Detail) - CAD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
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Disclosure Of Levels Of Fair Value Hierarchy [Line Items] |  |
Fair value of derivative financial instruments net | $ 1 | $ (68)
Level 2 of fair value hierarchy |  |
Disclosure Of Levels Of Fair Value Hierarchy [Line Items] |  |
Fair value of derivative financial instruments | 2 | (68)
Level 3 of fair value hierarchy |  |
Disclosure Of Levels Of Fair Value Hierarchy [Line Items] |  |
Fair value of derivative financial instruments | $ (1) | $ 0

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