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Acquisitions - Narrative (Details) $ in Millions, $ in Millions |  |  |  | 2 Months Ended | 7 Months Ended | 10 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 28, 2023 CAD ($) | Aug. 31, 2022 CAD ($) | Feb. 28, 2022 CAD ($) | Feb. 27, 2023 | Sep. 30, 2023 CAD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2022 CAD ($) | Feb. 28, 2023 USD ($)
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Acquisition-related costs for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination |  |  |  |  |  |  | $ 11 | $ 11 |
BP-Husky Refining LLC |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Agreement to purchase remaining ownership | 50.00% |  |  | 50.00% |  |  |  | 50.00% |
Total Purchase Consideration | $ 514 |  |  |  |  |  |  |  | $ 378
Accounts Payable and Accrued Liabilities | 3 |  |  |  |  |  |  |  |
Fair value of accounts receivable and accrued revenues recognised as of acquisition date | 508 |  |  |  |  |  |  |  |
Carrying value of investment in joint ventures recognised​ as of​ acquisition​ date | 554 |  |  |  |  |  |  |  |
Non-cash revaluation loss, before tax | 34 |  |  |  |  |  |  |  |
Non-cash revaluation loss, after tax |  |  | $ 23 |  |  |  |  |  |
Non-cash revaluation loss, cumulative foreign exchange | $ 12 |  |  |  |  |  |  |  |
Acquisition-related costs for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination |  |  |  |  |  |  | 11 | $ 9 |
Revenue of acquiree since acquisition date |  |  |  |  |  | $ 4,100 |  |  |
Profit (loss) of acquiree since acquisition date |  |  |  |  | $ (85) |  |  |  |
Revenue of combined entity as if combination occurred at beginning of period |  |  |  |  |  |  | 52,200 |  |
Profit (loss) of combined entity as if combination occurred at beginning of period |  |  |  |  |  |  | $ 4,000 |  |
BP-Husky Refining LLC | Property, plant and equipment |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Measurement period adjustments recognised for particular assets, liabilities, non-controlling interests or items of consideration |  |  |  |  |  | 96 |  |  |
BP-Husky Refining LLC | Inventory |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Measurement period adjustments recognised for particular assets, liabilities, non-controlling interests or items of consideration |  |  |  |  |  | (66) |  |  |
BP-Husky Refining LLC | Other Liabilities |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Measurement period adjustments recognised for particular assets, liabilities, non-controlling interests or items of consideration |  |  |  |  |  | (3) |  |  |
BP-Husky Refining LLC | Accounts Payable And Accrued Liabilities |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Measurement period adjustments recognised for particular assets, liabilities, non-controlling interests or items of consideration |  |  |  |  |  | $ (1) |  |  |
Sunrise Oil Sands Partnership |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Agreement to purchase remaining ownership |  | 50.00% |  |  |  |  |  |  |
Total Purchase Consideration |  | $ 1,034 |  |  |  |  |  |  |
Fair value of accounts receivable and accrued revenues recognised as of acquisition date |  | 1,559 |  |  |  |  |  |  |
Carrying value of investment in joint ventures recognised​ as of​ acquisition​ date |  | 960 |  |  |  |  |  |  |
Acquisition-related costs for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination |  |  |  |  |  |  |  | 2 |
Contingent consideration maximum payment |  | $ 600 |  |  |  |  |  |  |
Non-cash revaluation gain, before tax |  |  |  |  |  |  |  | 599 |
Non-cash revaluation gain, after tax |  |  |  |  |  |  |  | $ 457 |

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