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Risk management - Additional Information (Detail) $ in Millions | Sep. 30, 2020 CAD ($) $ / Mcf bbl / d $ / bbl | Dec. 31, 2019 CAD ($)
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Disclosure of risk management strategy [line items] |  |
Senior notes | $ 47 | $ 59
Crude Oil Contract [Member] | January - March 2021 |  |
Disclosure of risk management strategy [line items] |  |
Financial instruments, notional volume | bbl / d | 542 |
Financial instruments, benchmark pricing per unit | $ / bbl | 55.54 |
Natural gas [member] |  |
Disclosure of risk management strategy [line items] |  |
Pre-tax unrealized risk management, change in price per unit | $ / Mcf | 0.50 |
Pre-tax unrealized risk management, change in price, amount | $ 2 |
Senior notes [member] |  |
Disclosure of risk management strategy [line items] |  |
Senior notes | $ 63 | $ 62

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