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Financial Instruments - Additional Information (Detail) - CAD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of detailed information about financial instruments [Line Items] |  |
Fair value of unsecured senior notes | $ 1,428 | $ 1,548
Credit Risk [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Trade receivables | $ 12 | $ 18

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