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Divestitures (Details) $ in Millions |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Sep. 13, 2022 CAD ($) gas_station | Jun. 08, 2022 CAD ($) | May 31, 2022 CAD ($) | Feb. 28, 2022 CAD ($) | Jan. 31, 2022 CAD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2022 CAD ($)
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |  |  |
Proceeds from disposal of oil and gas assets |  |  |  |  |  | $ 0 |
Before-tax gain (loss) on disposal |  |  |  |  |  | $ 14 | $ 269
Retail |  |  |  |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |  |  |
Before-tax gain (loss) on disposal | $ 74 |  |  |  |  |  |
After-tax gain (loss) on disposal | $ 56 |  |  |  |  |  |
Number of stores sold | gas_station | 337 |  |  |  |  |  |
Consideration for sale of assets held for sale | $ 404 |  |  |  |  |  |
Tucker |  |  |  |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |  |  |
Proceeds from disposal of oil and gas assets |  |  |  |  | $ 730 |  |
Before-tax gain (loss) on disposal |  |  |  |  | 165 |  |
After-tax gain (loss) 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 (loss) on disposal |  |  |  | 76 |  |  |
After-tax gain (loss) on disposal |  |  |  | $ 58 |  |  |
White Rose Field |  |  |  |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |  |  |
Before-tax gain (loss) on disposal |  |  | $ 62 |  |  |  |
After-tax gain (loss) on disposal |  |  | $ 47 |  |  |  |
Percentage of working interest acquired |  |  | 12.50% |  |  |  |
Payment to transfer working interest |  |  | $ 50 |  |  |  |
Headwater Exploration Inc. |  |  |  |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |  |  |
Proceeds from disposal of oil and gas assets |  | $ 110 |  |  |  |  |
Before-tax gain (loss) on disposal |  | 0 |  |  |  |  |
After-tax gain (loss) on disposal |  | $ 0 |  |  |  |  |

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