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Long-term debt - Schedule of Long-term Debt (Parenthetical) (Detail) - Loan Maturity Date Extension [Member] - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Disclosure of detailed information about borrowings [line items] |  |
Debt, maturity date | November 30, 2021 |
6.40%, US$4 million, maturing November 30, 2021 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Debt, interest rate | 6.40% | 6.40%
Debt | $ 4 | $ 4
Debt, maturity date | November 30, 2021 | November 30, 2021
5.85%, US$10 million, maturing November 30, 2021 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Debt, interest rate | 5.85% | 5.85%
Debt | $ 10 | $ 10
Debt, maturity date | November 30, 2021 | November 30, 2021
4.88%, US$13 million, maturing November 30, 2021 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Debt, interest rate | 4.88% | 4.88%
Debt | $ 13 | $ 13
Debt, maturity date | November 30, 2021 | November 30, 2021
4.98%, US$6 million, maturing November 30, 2021 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Debt, interest rate | 4.98% | 4.98%
Debt | $ 6 | $ 6
Debt, maturity date | November 30, 2021 | November 30, 2021
5.23%, US$2 million, maturing November 30, 2021 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Debt, interest rate | 5.23% | 5.23%
Debt | $ 2 | $ 2
Debt, maturity date | November 30, 2021 | November 30, 2021
4.79%, US$12 million, maturing November 30, 2021 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Debt, interest rate | 4.79% | 4.79%
Debt | $ 12 | $ 12
Debt, maturity date | November 30, 2021 | November 30, 2021

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