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Oil and Gas Properties - Additional Information (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2020 CAD ($) cashGeneratingUnit | Jun. 30, 2021 CAD ($) cashGeneratingUnit | Dec. 31, 2021 CAD ($) cashGeneratingUnit | Dec. 31, 2020 CAD ($) cashGeneratingUnit | Dec. 31, 2019 CAD ($)
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Number of cash generating units | cashGeneratingUnit | 6 | 6 | 5 | 6 |
Number of cash generating units, with recoverable amounts | cashGeneratingUnit |  |  | 3 |  |
Reversal of impairment loss recognised in profit or loss |  | $ 1,100,000,000 |  | $ 341,326,000 |
Impairment loss (reversal of impairment loss) recognised in profit or loss |  | $ 1,126,415,000 | $ 416,000,000 |  |
Adjusted inflation for prices and costs subsequent to 2023 |  | 0.020 | 0.020 | 0.02 |
Conventional CGU |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Reversal of impairment loss recognised in profit or loss |  |  |  | $ 0 |
Impairment loss (reversal of impairment loss) recognised in profit or loss |  | $ 15,000,000 | $ 19,000,000 |  |
Conventional, Peace River, Lloydminster, And Duvernay |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Impairment loss (reversal of impairment loss) recognised in profit or loss |  |  |  | 0 |
Viking And Eagle Ford Cash Generating Units |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Reversal of impairment loss recognised in profit or loss |  |  |  | 341,300,000 |
Oil and gas assets |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Write-downs (reversals of write downs) |  |  | (1,500,000,000) | $ 2,200,000,000 |
Impairment loss (reversal of impairment loss) recognised in profit or loss |  |  | $ 1,542,414,000 |  | $ (2,247,162,000)
Impairment | $ (2,600,000,000) |  |  |  |
Oil and gas assets | Minimum |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Discount rate applied to cash flow projections | 8.00% | 10.00% | 12.00% | 10.00% |
Oil and gas assets | Maximum |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Discount rate applied to cash flow projections | 14.00% | 16.00% | 19.00% | 17.00% |
Oil and gas assets | Accumulated depreciation |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Impairment loss (reversal of impairment loss) recognised in profit or loss |  |  | $ 1,542,414,000 | $ (2,247,162,000) |

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