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Income Taxes - Additional Information (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Disclosure of income taxes [line items] |  |
Deferred Tax Expense (Recovery) | $ (250) | $ 642
Deferred Income Taxes | 696 | 546
Deferred tax expense (income) recognised in profit or loss | 0 | 0
Amounts of tax pools available, including tax losses | 16,952 | 15,439
BP-Husky Refining LLC |  |
Disclosure of income taxes [line items] |  |
Deferred Tax Expense (Recovery) | 115 |
Canadian Federal Non Capital Losses |  |
Disclosure of income taxes [line items] |  |
Amounts of tax pools available, including tax losses | 126 | 115
US Federal Net Operating Losses |  |
Disclosure of income taxes [line items] |  |
Amounts of tax pools available, including tax losses | 3,700 | 468
Canadian Net Capital Losses |  |
Disclosure of income taxes [line items] |  |
Amounts of tax pools available, including tax losses | 59 | 28
Net capital losses associated with unrealized foreign exchange losses | $ 141 | $ 504

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