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Income Taxes - Schedule of Movement in Deferred Income Tax Liabilities and Assets (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Reconciliation Of Changes In Deferred Tax Assets And Liabilities [Roll Forward] |  |
Deferred income tax assets, beginning balance | $ (1,489) | $ (778)
Deferred income tax liabilities, beginning balance | 4,981 | 4,515
Net deferred income tax liabilities, beginning balance | 3,492 | 3,737
Deferred tax expense (income) recognised in profit or loss | 0 | 0
Deferred income tax assets, ending balance | (1,298) | (1,489)
Deferred income tax liabilities, ending balance | 4,279 | 4,981
Net deferred income tax liabilities, ending balance | 2,981 | 3,492
Deferred Income Tax Assets |  |
Reconciliation Of Changes In Deferred Tax Assets And Liabilities [Roll Forward] |  |
Deferred tax expense (income) recognised in profit or loss | 233 | (723)
Charged (Credited) to Other Comprehensive Income | (42) | 12
Deferred Income Tax Liabilities |  |
Reconciliation Of Changes In Deferred Tax Assets And Liabilities [Roll Forward] |  |
Deferred tax expense (income) recognised in profit or loss | (707) | 473
Deferred Income Tax Liabilities | Husky Energy, Inc. |  |
Reconciliation Of Changes In Deferred Tax Assets And Liabilities [Roll Forward] |  |
Charged (credited) to acquisitions |  | (7)
Deferred Income Tax Liabilities | Sunrise Oil Sands Partnership |  |
Reconciliation Of Changes In Deferred Tax Assets And Liabilities [Roll Forward] |  |
Charged (credited) to acquisitions | 5 |
Net Deferred Income Tax Liabilities |  |
Reconciliation Of Changes In Deferred Tax Assets And Liabilities [Roll Forward] |  |
Deferred tax expense (income) recognised in profit or loss | (474) | (250)
Charged (Credited) to Other Comprehensive Income | (37) | 5
Property, plant and equipment |  |
Reconciliation Of Changes In Deferred Tax Assets And Liabilities [Roll Forward] |  |
Deferred income tax liabilities, beginning balance | 4,948 | 4,460
Deferred income tax liabilities, ending balance | 4,237 | 4,948
Property, plant and equipment | Deferred Income Tax Liabilities |  |
Reconciliation Of Changes In Deferred Tax Assets And Liabilities [Roll Forward] |  |
Deferred tax expense (income) recognised in profit or loss | (716) | 495
Property, plant and equipment | Deferred Income Tax Liabilities | Husky Energy, Inc. |  |
Reconciliation Of Changes In Deferred Tax Assets And Liabilities [Roll Forward] |  |
Charged (credited) to acquisitions |  | (7)
Property, plant and equipment | Deferred Income Tax Liabilities | Sunrise Oil Sands Partnership |  |
Reconciliation Of Changes In Deferred Tax Assets And Liabilities [Roll Forward] |  |
Charged (credited) to acquisitions | 5 |
Other |  |
Reconciliation Of Changes In Deferred Tax Assets And Liabilities [Roll Forward] |  |
Deferred income tax liabilities, beginning balance | 33 | 55
Deferred income tax liabilities, ending balance | 42 | 33
Other | Deferred Income Tax Liabilities |  |
Reconciliation Of Changes In Deferred Tax Assets And Liabilities [Roll Forward] |  |
Deferred tax expense (income) recognised in profit or loss | 9 | (22)
Other | Deferred Income Tax Liabilities | Husky Energy, Inc. |  |
Reconciliation Of Changes In Deferred Tax Assets And Liabilities [Roll Forward] |  |
Charged (credited) to acquisitions |  | 0
Other | Deferred Income Tax Liabilities | Sunrise Oil Sands Partnership |  |
Reconciliation Of Changes In Deferred Tax Assets And Liabilities [Roll Forward] |  |
Charged (credited) to acquisitions | 0 |
Unused Tax Losses |  |
Reconciliation Of Changes In Deferred Tax Assets And Liabilities [Roll Forward] |  |
Deferred income tax assets, beginning balance | (914) | (156)
Deferred income tax assets, ending balance | (738) | (914)
Unused Tax Losses | Deferred Income Tax Assets |  |
Reconciliation Of Changes In Deferred Tax Assets And Liabilities [Roll Forward] |  |
Deferred tax expense (income) recognised in profit or loss | 242 | (777)
Charged (Credited) to Other Comprehensive Income | (66) | 19
Other |  |
Reconciliation Of Changes In Deferred Tax Assets And Liabilities [Roll Forward] |  |
Deferred income tax assets, beginning balance | (575) | (622)
Deferred income tax assets, ending balance | (560) | (575)
Other | Deferred Income Tax Assets |  |
Reconciliation Of Changes In Deferred Tax Assets And Liabilities [Roll Forward] |  |
Deferred tax expense (income) recognised in profit or loss | (9) | 54
Charged (Credited) to Other Comprehensive Income | $ 24 | $ (7)

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