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Exploration and Evaluation Assets - Narrative (Details) - CAD ($) $ in Millions | Dec. 31, 2021 | Dec. 17, 2021 | Dec. 31, 2020 | Oct. 06, 2020 | Dec. 31, 2019 | Jun. 27, 2019
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STORM Resources Ltd |  |  |  |  |  |
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items] |  |  |  |  |  |
Cash consideration |  | $ 771 |  |  |  |
Exploration and evaluation assets |  | $ 13 |  |  |  |
Total purchase consideration | $ 771 |  |  |  |  |
Painted Pony Energy Ltd |  |  |  |  |  |
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items] |  |  |  |  |  |
Cash consideration |  |  |  | $ 111 |  |
Exploration and evaluation assets |  |  | $ 15 | $ 15 |  |
Total purchase consideration |  |  | $ 111 |  |  |
Devon |  |  |  |  |  |
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items] |  |  |  |  |  |
Exploration and evaluation assets |  |  |  |  | $ 91 | $ 91
Total purchase consideration |  |  |  |  | $ 3,412 | $ 3,412

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