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Divestitures (Details) - CAD ($) $ in Millions |  | 2 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
May 01, 2021 | Aug. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |  |  |  |  |
Before-tax gain on disposal |  |  | $ 25 | $ 1 | $ 97 | $ 0 | $ 81 | $ 2 | $ (795)
Marten Hills, Alberta |  |  |  |  |  |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |  |  |  |  |
Proceeds from disposal of oil and gas assets | $ 102 |  |  |  |  |  |  |  |
Before-tax gain on disposal | 60 |  |  |  |  |  |  |  |
After-tax gain on disposal | $ 47 |  |  |  |  |  |  |  |
East Clearwater area and Kaybob area |  |  |  |  |  |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |  |  |  |  |
Proceeds from disposal of oil and gas assets |  | $ 82 |  |  |  |  |  |  |
Before-tax gain on disposal |  |  | 17 |  |  |  |  |  |
After-tax gain on disposal |  |  | $ 13 |  |  |  |  |  |

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