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Acquisitions and Divestitures (Details) - CAD ($) $ in Millions |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 13, 2022 | Jun. 08, 2022 | May 31, 2022 | Feb. 28, 2022 | Jan. 31, 2022 | Sep. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | [1]
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |  |  |  |  |  |  |
Before-tax gain on disposal |  |  |  |  |  |  | $ 62 | $ 60 | [1] | $ 304 | $ 72
White Rose Field |  |  |  |  |  |  |  |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |  |  |  |  |  |  |
Before-tax gain on disposal |  |  |  |  |  | $ 62 |  |  |  |  |
After-tax gain on disposal |  |  |  |  |  | $ 47 |  |  |  |  |
Percentage of working interest acquired |  |  |  |  |  | 1250.00% |  |  |  |  |
Payment to transfer working interest |  |  | $ 50 |  |  |  |  |  |  |  |
Tucker |  |  |  |  |  |  |  |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from disposal of oil and gas assets |  |  |  |  | $ 730 |  |  |  |  |  |
Before-tax gain on disposal |  |  |  |  | 165 |  |  |  |  |  |
After-tax gain on disposal |  |  |  |  | $ 126 |  |  |  |  |  |
Wembley |  |  |  |  |  |  |  |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from disposal of oil and gas assets |  |  |  | $ 221 |  |  |  |  |  |  |
Before-tax gain on disposal |  |  |  | 76 |  |  |  |  |  |  |
After-tax gain on disposal |  |  |  | $ 58 |  |  |  |  |  |  |
Headwater Exploration Inc. |  |  |  |  |  |  |  |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from disposal of oil and gas assets |  | $ 110 |  |  |  |  |  |  |  |  |
Sunrise Oil Sands Partnership |  |  |  |  |  |  |  |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |  |  |  |  |  |  |
Agreement to purchase remaining ownership | 50.00% |  |  |  |  |  |  |  |  |  |
Purchase of oil and gas assets | $ 600 |  |  |  |  |  |  |  |  |  |
Contingent consideration maximum payment | $ 600 |  |  |  |  |  |  |  |  |  |
Contingent consideration period of transaction | 2 years |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in joint operation | 35.00% |  |  |  |  |  |  |  |  | 50.00% |
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 |  |  |
[1] | See Note 3 for revisions to prior period results.

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