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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, 2022 | Dec. 31, 2021
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Deferred income tax liabilities, beginning balance | $ 4,046 | $ 4,146
Deferred income tax assets, beginning balance | (1,454) | (948)
Net deferred income tax liabilities, beginning balance | 2,592 | 3,198
Deferred income tax liabilities, ending balance | 4,515 | 4,046
Deferred income tax assets, ending balance | (778) | (1,454)
Net deferred income tax liabilities, ending balance | 3,737 | 2,592
Unused Tax Losses |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Deferred income tax assets, beginning balance | (655) | (659)
Deferred income tax assets, ending balance | (156) | (655)
Deferred Income Tax Liabilities |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (Credited) to Earnings | (17) | (159)
Deferred Income Tax Liabilities | Husky Energy, Inc. |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (Credited) to Acquisitions |  | 59
Deferred Income Tax Liabilities | Sunrise Oil Sands Partnership |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (Credited) to Acquisitions | 486 |
Deferred Income Tax Assets |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (Credited) to Earnings | 659 | 611
Charged (Credited) to Acquisitions | 0 | (1,121)
Charged (Credited) to Other Comprehensive Income | 17 | 4
Deferred Income Tax Assets | Unused Tax Losses |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (Credited) to Earnings | 490 | 668
Charged (Credited) to Acquisitions | 0 | (656)
Charged (Credited) to Other Comprehensive Income | 9 | (8)
Net Deferred Income Tax Liabilities |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (Credited) to Earnings | 642 | 452
Charged (Credited) to Acquisitions | 486 | (1,062)
Charged (Credited) to Other Comprehensive Income | 17 | 4
PP&E |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Deferred income tax liabilities, beginning balance | 3,949 | 4,124
Deferred income tax liabilities, ending balance | 4,460 | 3,949
PP&E | Deferred Income Tax Liabilities |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (Credited) to Earnings | 25 | (234)
PP&E | Deferred Income Tax Liabilities | Husky Energy, Inc. |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (Credited) to Acquisitions |  | 59
PP&E | Deferred Income Tax Liabilities | Sunrise Oil Sands Partnership |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (Credited) to Acquisitions | 486 |
Risk Management |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Deferred income tax liabilities, beginning balance | 0 | 0
Deferred income tax assets, beginning balance | (11) | (13)
Deferred income tax liabilities, ending balance | 11 | 0
Deferred income tax assets, ending balance | 0 | (11)
Risk Management | Deferred Income Tax Liabilities |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (Credited) to Earnings | 11 | 0
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 |
Risk Management | Deferred Income Tax Assets |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (Credited) to Earnings | 11 | 1
Charged (Credited) to Acquisitions | 0 | 1
Charged (Credited) to Other Comprehensive Income | 0 | 0
Other |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Deferred income tax liabilities, beginning balance | 97 | 22
Deferred income tax assets, beginning balance | (788) | (276)
Deferred income tax liabilities, ending balance | 44 | 97
Deferred income tax assets, ending balance | (622) | (788)
Other | Deferred Income Tax Liabilities |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (Credited) to Earnings | (53) | 75
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 |
Other | Deferred Income Tax Assets |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (Credited) to Earnings | 158 | (58)
Charged (Credited) to Acquisitions | 0 | (466)
Charged (Credited) to Other Comprehensive Income | $ 8 | $ 12

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