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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, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Disclosure Of Effect Of Changes In Foreign Exchange Rates Gain Loss [Line Items] |  |  |  |
Unrealized Foreign Exchange (Gain) Loss | $ (108) | $ 59 | $ 101 | $ (99)
Realized Foreign Exchange (Gain) Loss | 35 | 74 | (20) | 106
Total | (73) | 133 | 81 | 7
U.S. Dollar Debt |  |  |  |
Disclosure Of Effect Of Changes In Foreign Exchange Rates Gain Loss [Line Items] |  |  |  |
Unrealized Foreign Exchange (Gain) Loss | (71) | 28 | 104 | (119)
Other |  |  |  |
Disclosure Of Effect Of Changes In Foreign Exchange Rates Gain Loss [Line Items] |  |  |  |
Unrealized Foreign Exchange (Gain) Loss | $ (37) | $ 31 | $ (3) | $ 20

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