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Long-Term Debt - Aggregate Maturities of Long-term Debt (Detail) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of detailed information about borrowings [Line Items] |  |
Long-term debt | $ 4,769 | $ 4,784
Less than 1 year [Member] |  |
Disclosure of detailed information about borrowings [Line Items] |  |
Long-term debt |  | 400
One to two years [Member] |  |
Disclosure of detailed information about borrowings [Line Items] |  |
Long-term debt | 681 |
Two to three years [Member] |  |
Disclosure of detailed information about borrowings [Line Items] |  |
Long-term debt |  | 626
Over 5 years [Member] |  |
Disclosure of detailed information about borrowings [Line Items] |  |
Long-term debt | $ 4,088 | $ 3,758

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