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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 | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure Of Levels Of Fair Value Hierarchy [Line Items] |  |
Fair Value of Risk Management Assets and Liabilities | $ 53 |
Level 2 of Fair Value Hierarchy [Member] |  |
Disclosure Of Levels Of Fair Value Hierarchy [Line Items] |  |
Fair Value of Risk Management Assets and Liabilities | $ (53) | $ 3

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- Definition Fair value of derivative financial instruments net. + References No definition available. + Details
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- Details
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