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Revenue - Disclosure of Significant Revenue (Detail) - CAD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Disclosure of disaggregation of revenue from contracts with customers [line items]          
Production revenues $ 75 $ 91 $ 202 $ 298  
Other revenue 0 0 6 0  
Processing fees 2 2 5 6  
Financing income 0 1 0 2 $ 2
Oil and natural gas sales and other income 77 94 213 306  
Crude oil [member]          
Disclosure of disaggregation of revenue from contracts with customers [line items]          
Production revenues 59 83 158 265  
Natural gas liquids [member]          
Disclosure of disaggregation of revenue from contracts with customers [line items]          
Production revenues 4 3 11 10  
Natural gas [member]          
Disclosure of disaggregation of revenue from contracts with customers [line items]          
Production revenues $ 12 $ 5 $ 33 $ 23