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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure Of Levels Of Fair Value Hierarchy [Line Items] |  |  |
Fair value of derivative financial instruments net | $ 46 | $ (68) | $ (53)
Level 2 of fair value hierarchy |  |  |
Disclosure Of Levels Of Fair Value Hierarchy [Line Items] |  |  |
Fair value of derivative financial instruments net | (44) | (68) |
Level 3 of fair value hierarchy [member] |  |  |
Disclosure Of Levels Of Fair Value Hierarchy [Line Items] |  |  |
Fair value of derivative financial instruments net | $ 90 | $ 0 |

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