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Impairment Charges and Reversals - Additional Information (Detail) $ in Millions |  | 2 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2023 | Feb. 27, 2023 | Dec. 31, 2023 CAD ($) | Dec. 31, 2022 CAD ($)
BP-Husky Refining LLC |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Agreement to purchase remaining ownership | 50.00% | 50.00% |  | 50.00%
Discounted future cash flows | Minimum | Discount rate |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Significant unobservable input, assets |  |  | 0.14 |
Upstream |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
CGU Impairments |  |  | $ 0 | $ 0
Upstream | Discounted future cash flows | Discount rate |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
CGU Impairments |  |  |  | $ 0
Significant unobservable input, assets |  |  |  | 0.01
Upstream | Discounted future cash flows | Forward Price Estimate |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
CGU Impairments |  |  |  | $ 0
Significant unobservable input, assets |  |  |  | 0.05
Upstream | Discounted future cash flows | Minimum | Discount rate |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Significant unobservable input, assets |  |  |  | 0.14
Upstream | Discounted future cash flows | Maximum | Discount rate |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Significant unobservable input, assets |  |  |  | 0.15
Downstream |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
CGU Impairments |  |  | $ 0 |
Downstream | Discounted future cash flows | Minimum |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Significant unobservable input, assets |  |  |  | 0.15
Downstream | Discounted future cash flows | Maximum |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Significant unobservable input, assets |  |  |  | 0.18
Downstream | Growth rate |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Significant unobservable input, assets |  |  |  | 0.02
U.S. Refining | Downstream |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Recoverable amount of asset or cash-generating unit |  |  |  | $ 5,400
Sunrise | Discounted future cash flows | Discount rate |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Significant unobservable input, assets |  |  | 0.01 |
Sunrise | Discounted future cash flows | Forward Price Estimate |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Significant unobservable input, assets |  |  | 0.05 |
Sunrise | Upstream |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
CGU Impairments |  |  |  | 0
Sunrise | Upstream | Discount rate |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
CGU Impairments |  |  | $ 0 | $ 69
Significant unobservable input, assets |  |  |  | 0.01
Sunrise | Upstream | Forward Price Estimate |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
CGU Impairments |  |  | $ 0 |
Sunrise | Upstream | Discounted future cash flows | Forward Price Estimate |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
CGU Impairments |  |  |  | $ 226
Significant unobservable input, assets |  |  |  | 0.05
Borger, Wood River, and Lima CGUs | Downstream |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Impairment Reversals (Note 11) |  |  |  | $ 1,200
Superior and Toledo CGU | Downstream |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
CGU Impairments |  |  |  | $ 1,500

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