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Acquisitions - Narrative (Details) $ in Millions, $ in Millions |  |  |  | 3 Months Ended | 7 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 28, 2023 CAD ($) | Aug. 31, 2022 | Feb. 28, 2022 CAD ($) | Sep. 30, 2023 CAD ($) | Sep. 30, 2022 CAD ($) | Sep. 30, 2023 CAD ($) | Sep. 30, 2023 CAD ($) | Sep. 30, 2022 CAD ($) | Feb. 28, 2023 USD ($)
BP-Husky Refining LLC |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Agreement to purchase remaining ownership | 50.00% |  |  |  |  |  |  |  |
Total Purchase Consideration | $ 502 |  |  |  |  |  |  |  | $ 369
Accounts Receivable and Accrued Revenues | 3 |  |  |  |  |  |  |  |
Fair Value of Pre-Existing 50 Percent Ownership Interest in Toledo | 494 |  |  |  |  |  |  |  |
Carrying value of investment in joint ventures recognised​ as of​ acquisition​ date | 539 |  |  |  |  |  |  |  |
Non-cash revaluation loss, before tax | 33 |  |  |  |  |  |  |  |
Non-cash revaluation loss, after tax |  |  | $ 22 |  |  |  |  |  |
Non-cash revaluation loss, cumulative foreign exchange | $ 12 |  |  |  |  |  |  |  |
Integration costs |  |  |  | $ 10 | $ 0 |  | $ 38 | $ 0 |
Transaction Costs |  |  |  | $ 2 | $ 2 |  | 11 | $ 2 |
Revenue of acquiree since acquisition date |  |  |  |  |  | $ 2,400 |  |  |
Profit (loss) of acquiree since acquisition date |  |  |  |  |  | $ (84) |  |  |
Revenue of combined entity as if combination occurred at beginning of period |  |  |  |  |  |  | 39,100 |  |
Profit (loss) of combined entity as if combination occurred at beginning of period |  |  |  |  |  |  | $ 3,300 |  |
Sunrise Oil Sands Partnership |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Agreement to purchase remaining ownership |  | 50.00% |  |  |  |  |  |  |

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