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Foreign Exchange (Gain) Loss, Net - Schedule of Foreign Exchange Gain Loss Net (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Disclosure Of Effect Of Changes In Foreign Exchange Rates Gain Loss [Line Items] |  |
Unrealized Foreign Exchange (Gain) Loss | $ (210) | $ 365
Realized Foreign Exchange (Gain) Loss | 143 | (22)
Total | (67) | 343
U.S. Dollar Debt Issued From Canada |  |
Disclosure Of Effect Of Changes In Foreign Exchange Rates Gain Loss [Line Items] |  |
Unrealized Foreign Exchange (Gain) Loss | (231) | 365
Other |  |
Disclosure Of Effect Of Changes In Foreign Exchange Rates Gain Loss [Line Items] |  |
Unrealized Foreign Exchange (Gain) Loss | $ 21 | $ 0

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