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Property, Plant and Equipment - Summary of Net Assets Acquired and Liablities Assumed (Details) - CAD ($) $ in Millions | Oct. 06, 2020 | Dec. 17, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Jun. 27, 2019
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STORM Resources Ltd |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Property, plant and equipment |  | $ 1,114 |  |  |
Exploration and evaluation assets |  | 13 |  |  |
Working capital |  | 20 |  |  |
Long-term debt |  | (183) |  |  |
Asset retirement obligations |  | (18) |  |  |
Other long-term liabilities |  | (35) |  |  |
Deferred tax liability |  | (140) |  |  |
Net assets acquired |  | 771 |  |  |
Less: cash consideration |  | $ 771 |  |  |
Devon |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Property, plant and equipment |  |  |  |  | $ 3,325
Exploration and evaluation assets |  |  |  | $ 91 | 91
Inventory, prepaids and other long-term assets |  |  |  |  | 195
Accrued liabilities |  |  |  |  | (21)
Asset retirement obligations |  |  |  |  | (178)
Net assets acquired |  |  |  |  | $ 3,412
Painted Pony Energy Ltd |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Property, plant and equipment | $ 750 |  |  |  |
Exploration and evaluation assets | 15 |  | $ 15 |  |
Other long-term assets | 204 |  |  |  |
Long-term debt | (397) |  |  |  |
Asset retirement obligations | (13) |  |  |  |
Other long-term liabilities | (442) |  |  |  |
Deferred tax asset | 211 |  |  |  |
Net assets acquired | 328 |  |  |  |
Less: cash consideration | 111 |  |  |  |
Gain on acquisition | $ 217 |  |  |  |

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