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Goodwill - Additional Information (Detail) - CAD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Information For Individual Asset Or Cashgenerating Unit With Significant Amount Of Goodwill Or Intangible Assets With Indefinite Useful Lives [Line Items] |  |  |
Goodwill |  | $ 2,272,000,000 | $ 2,272,000,000
Goodwill impairments | $ 0 | 0 | 0
Primrose (Foster Creek) [Member] |  |  |
Disclosure Of Information For Individual Asset Or Cashgenerating Unit With Significant Amount Of Goodwill Or Intangible Assets With Indefinite Useful Lives [Line Items] |  |  |
Goodwill |  | 1,171,000,000 | 1,171,000,000
Christina Lake [Member] |  |  |
Disclosure Of Information For Individual Asset Or Cashgenerating Unit With Significant Amount Of Goodwill Or Intangible Assets With Indefinite Useful Lives [Line Items] |  |  |
Goodwill |  | $ 1,101,000,000 | $ 1,101,000,000

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