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Foreign Exchange (Gain) Loss, Net - Schedule of Foreign Exchange Gain Loss Net (Detail) - CAD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Disclosure Of Effect Of Changes In Foreign Exchange Rates Gain Loss [Line Items] |  |  |  |
Unrealized Foreign Exchange (Gain) Loss | $ 59 | $ 298 | $ (99) | $ 419
Realized Foreign Exchange (Gain) Loss | 74 | 18 | 106 | (13)
Total | 133 | 316 | 7 | 406
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 | 28 | 324 | (119) | 444
Other |  |  |  |
Disclosure Of Effect Of Changes In Foreign Exchange Rates Gain Loss [Line Items] |  |  |  |
Unrealized Foreign Exchange (Gain) Loss | $ 31 | $ (26) | $ 20 | $ (25)

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