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Foreign Exchange (Gain) Loss, Net - Schedule of Foreign Exchange Gain Loss Net (Detail) - CAD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Disclosure Of Effect Of Changes In Foreign Exchange Rates Gain Loss [Line Items] |  |  |  |  |  |
Unrealized Foreign Exchange (Gain) Loss | $ 260 | $ (192) |  | $ 121 | $ (331) |
Realized Foreign Exchange (Gain) Loss | (68) | 20 |  | (31) | 42 |
Total | 192 | (172) | [1] | 90 | (289) | [1]
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 | 273 | (150) |  | 120 | (280) |
Other |  |  |  |  |  |
Disclosure Of Effect Of Changes In Foreign Exchange Rates Gain Loss [Line Items] |  |  |  |  |  |
Unrealized Foreign Exchange (Gain) Loss | $ (13) | $ (42) |  | $ 1 | $ (51) |
[1] | See Note 3 for revisions to prior period results.

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