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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Disclosure Of Levels Of Fair Value Hierarchy [Line Items] |  |  |
Fair value of derivative financial instruments net | $ 12 | $ 46 | $ (68)
Level 2 |  |  |
Disclosure Of Levels Of Fair Value Hierarchy [Line Items] |  |  |
Fair value of derivative financial instruments net | (6) | (44) |
Level 3 |  |  |
Disclosure Of Levels Of Fair Value Hierarchy [Line Items] |  |  |
Fair value of derivative financial instruments net | $ 18 | $ 90 |

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