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Oil and Gas Properties - Sensitivity of the Estimated Recoverable Amount of Possible Changes (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2020
CAD ($)
cadPerMcf
Jun. 30, 2021
CAD ($)
Dec. 31, 2021
CAD ($)
Dec. 31, 2020
CAD ($)
cadPerBbl
cadPerMcf
Disclosure of detailed information about property, plant and equipment [line items]        
Discount rate       1.00%
Oil price | cadPerBbl       2.50
Gas price | cadPerMcf 0.25     0.25
Recoverable amount $ 2,974,796 $ 4,106,595 $ 4,375,103 $ 3,077,548
Impairment   1,126,415 416,000  
Impairment (reversal) loss 2,588,488   (1,542,414) 2,360,220
Change in discount rate of 1% 220,750 218,900 156,200 140,600
Change in oil price of $2.50/bbl 400,500 330,900 332,300 386,000
Change in gas price of $0.25/mcf 49,000 83,900 47,300 57,400
Reversal of impairment loss recognised in profit or loss   1,100,000   341,326
Conventional CGU        
Disclosure of detailed information about property, plant and equipment [line items]        
Recoverable amount 37,444 57,891 77,846 54,265
Impairment   15,000 19,000  
Impairment (reversal) loss 41,000      
Change in discount rate of 1% 3,000 1,000 0 1,000
Change in oil price of $2.50/bbl 3,500 1,000 3,000 3,000
Change in gas price of $0.25/mcf 8,500 8,000 8,000 9,000
Reversal of impairment loss recognised in profit or loss       0
Peace River CGU        
Disclosure of detailed information about property, plant and equipment [line items]        
Recoverable amount 109,631 238,714 489,274 104,225
Impairment   154,000 251,000  
Impairment (reversal) loss 345,000      
Change in discount rate of 1% 9,500 4,000 8,500 1,000
Change in oil price of $2.50/bbl 53,500 40,000 53,000 49,500
Change in gas price of $0.25/mcf 3,000 2,500 3,500 3,000
Reversal of impairment loss recognised in profit or loss       0
Lloydminster CGU        
Disclosure of detailed information about property, plant and equipment [line items]        
Recoverable amount 227,967 340,730 479,411 212,979
Impairment   154,000 146,000  
Impairment (reversal) loss 470,000      
Change in discount rate of 1% 25,000 12,500 12,500 7,000
Change in oil price of $2.50/bbl 69,500 52,000 52,000 57,500
Change in gas price of $0.25/mcf 0 0 0 500
Reversal of impairment loss recognised in profit or loss       0
Duvernay CGU        
Disclosure of detailed information about property, plant and equipment [line items]        
Recoverable amount 61,197 115,157   70,491
Impairment   5,000    
Impairment (reversal) loss 5,000      
Change in discount rate of 1% 5,500 45,000   5,500
Change in oil price of $2.50/bbl 9,500 44,500   12,000
Change in gas price of $0.25/mcf 1,500 44,500   1,500
Reversal of impairment loss recognised in profit or loss   5,000   0
Viking CGU        
Disclosure of detailed information about property, plant and equipment [line items]        
Recoverable amount 962,134 1,338,985 1,320,094 1,026,026
Impairment   356,000 0  
Impairment (reversal) loss 915,000      
Change in discount rate of 1% 57,000 47,000 38,000 34,500
Change in oil price of $2.50/bbl 123,000 89,500 85,500 106,500
Change in gas price of $0.25/mcf 4,000 4,500 4,500 5,000
Reversal of impairment loss recognised in profit or loss       116,000
Eagle Ford CGU        
Disclosure of detailed information about property, plant and equipment [line items]        
Recoverable amount 1,576,423 2,015,118 2,008,478 1,609,562
Impairment   442,415 0  
Impairment (reversal) loss 812,488      
Change in discount rate of 1% 120,750 109,400 97,200 91,600
Change in oil price of $2.50/bbl 141,500 103,900 138,800 157,500
Change in gas price of $0.25/mcf $ 32,000 $ 24,400 $ 31,300 38,400
Reversal of impairment loss recognised in profit or loss       $ 225,326