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Long-Term Debt - Additional Information (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of detailed information about borrowings [Line Items] |  |
Interest paid on long-term debt | $ 0 | $ 216
Level 2 [Member] |  |
Disclosure of detailed information about borrowings [Line Items] |  |
Fair value of long-term debt | $ 0 | $ 5,078

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