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Risk management - Additional Information (Detail)
$ in Millions
Sep. 30, 2020
CAD ($)
$ / Mcf
bbl / d
$ / bbl
Dec. 31, 2019
CAD ($)
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