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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, 2023 | Dec. 31, 2022
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Deferred income tax assets, beginning balance | $ (778) | $ (1,454)
Deferred income tax liabilities, beginning balance | 4,515 | 4,046
Net deferred income tax liabilities, beginning balance | 3,737 | 2,592
Deferred tax expense (income) recognised in profit or loss | 0 | 0
Deferred income tax assets, ending balance | (1,489) | (778)
Deferred income tax liabilities, ending balance | 4,981 | 4,515
Net deferred income tax liabilities, ending balance | 3,492 | 3,737
Unused Tax Losses |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Deferred income tax assets, beginning balance | (156) | (655)
Deferred income tax assets, ending balance | (914) | (156)
Deferred Income Tax Assets |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Deferred tax expense (income) recognised in profit or loss | (723) | 659
Charged (Credited) to Other Comprehensive Income | 12 | 17
Deferred Income Tax Assets | Unused Tax Losses |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Deferred tax expense (income) recognised in profit or loss | (777) | 490
Charged (Credited) to Other Comprehensive Income | 19 | 9
Deferred Income Tax Liabilities |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Deferred tax expense (income) recognised in profit or loss | 473 | (17)
Deferred Income Tax Liabilities | Husky Energy, Inc. |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (credited) to acquisitions |  | 486
Deferred Income Tax Liabilities | Sunrise Oil Sands Partnership |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (credited) to acquisitions | (7) |
Net Deferred Income Tax Liabilities |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Deferred tax expense (income) recognised in profit or loss | (250) | 642
Charged (credited) to acquisitions |  | 486
Charged (Credited) to Other Comprehensive Income | 5 | 17
Property, plant and equipment |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Deferred income tax liabilities, beginning balance | 4,460 | 3,949
Deferred income tax liabilities, ending balance | 4,948 | 4,460
Property, plant and equipment | Deferred Income Tax Liabilities |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Deferred tax expense (income) recognised in profit or loss | 495 | 25
Property, plant and equipment | Deferred Income Tax Liabilities | Husky Energy, Inc. |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (credited) to acquisitions |  | 486
Property, plant and equipment | Deferred Income Tax Liabilities | Sunrise Oil Sands Partnership |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (credited) to acquisitions | (7) |
Risk Management |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Deferred income tax assets, beginning balance | 0 | (11)
Deferred income tax liabilities, beginning balance | 11 | 0
Deferred income tax assets, ending balance | 0 | 0
Deferred income tax liabilities, ending balance | 3 | 11
Risk Management | Deferred Income Tax Assets |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Deferred tax expense (income) recognised in profit or loss | 0 | 11
Charged (Credited) to Other Comprehensive Income | 0 | 0
Risk Management | Deferred Income Tax Liabilities |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Deferred tax expense (income) recognised in profit or loss | (8) | 11
Risk Management | Deferred Income Tax Liabilities | Husky Energy, Inc. |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (credited) to acquisitions |  | 0
Risk Management | Deferred Income Tax Liabilities | Sunrise Oil Sands Partnership |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (credited) to acquisitions | 0 |
Other |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Deferred income tax assets, beginning balance | (622) | (788)
Deferred income tax liabilities, beginning balance | 44 | 97
Deferred income tax assets, ending balance | (575) | (622)
Deferred income tax liabilities, ending balance | 30 | 44
Other | Deferred Income Tax Assets |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Deferred tax expense (income) recognised in profit or loss | 54 | 158
Charged (Credited) to Other Comprehensive Income | (7) | 8
Other | Deferred Income Tax Liabilities |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Deferred tax expense (income) recognised in profit or loss | (14) | (53)
Other | Deferred Income Tax Liabilities | Husky Energy, Inc. |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (credited) to acquisitions |  | $ 0
Other | Deferred Income Tax Liabilities | Sunrise Oil Sands Partnership |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (credited) to acquisitions | $ 0 |

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