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Divestitures - Additional Information (Detail) - CAD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 02, 2020 | Dec. 31, 2018
Disclosure Of Disposals [Line Items] |  |
Gain (Loss) before tax on sale of assets |  | $ 797
Gain (Loss) after tax on sale of assets |  | 557
Marten Hills Oil Assets [Member] |  |
Disclosure Of Disposals [Line Items] |  |
Proceeds from sale of assets | $ 138 |
Gain (Loss) before tax on sale of assets | 79 |
Gain (Loss) after tax on sale of assets | 65 |
Consideration received as cash | 33 |
Consideration received as common shares | $ 97 |
Number of shares received as consideration | 50 |
Consideration received as warrants | 15 |
Term of warrants | 3 years |
Exercise price of warrants | $ 2.00 |
Warrants value | $ 8 |
Gross overriding royalty | $ 41 |
Cenovus Pipestone Partnership [Member] |  |
Disclosure Of Disposals [Line Items] |  |
Proceeds from sale of assets |  | $ 625
Wembley Gas Plant [Member] |  |
Disclosure Of Disposals [Line Items] |  |
Percentage of operating working capital interest |  | 39.00%

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