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Long-term debt - Schedule of Long-term Debt (Detail) - CAD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | $ 458 | $ 461
Current portion | 0 | 434
Long-term portion | $ 458 | $ 27
Weighted average remaining life (years) | 1.2 Years | 1.5 Years
Weighted average interest rate | 5.20% | 5.70%
Bankers acceptances and prime rate loans [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | $ 395 | $ 399
6.40%, US$4 million, maturing November 30, 2021 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 5 | 5
5.85%, US$10 million, maturing November 30, 2021 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 13 | 13
4.88%, US$13 million, maturing November 30, 2021 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 18 | 17
4.98%, US$6 million, maturing November 30, 2021 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 8 | 8
5.23%, US$2 million, maturing November 30, 2021 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 3 | 3
4.79%, US$12 million, maturing November 30, 2021 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | $ 16 | $ 16

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