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Impairment Charges and Reversals - Additional Information (Detail) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 08, 2022 | Mar. 31, 2020 CAD ($) | Sep. 30, 2020 CAD ($) | Dec. 31, 2022 CAD ($) | Dec. 31, 2021 CAD ($) | Dec. 31, 2020 CAD ($)
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |
Goodwill impairments |  |  |  | $ 0 | $ 0 |
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% |  |
Discounted future cash flows |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |
Significant unobservable input, assets |  |  | 0.10 |  |  |
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 | 0.01 | 0.01
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 | 0.05 | 0.05
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 |  |  |  |  |  | 0.10
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 | 0.10 |
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 |  |  |  |  |  | 0.15
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 | 0.15 |
Upstream |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |
CGU Impairments |  |  |  | $ 0 | $ 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 | 0.10 |
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 | 0.12 |
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 | 0.02 | 0.02
Conventional |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |
CGU Impairments |  |  |  |  |  | $ 555,000,000
Reversal of impairment loss recognised in profit or loss |  |  |  |  | $ 378,000,000 |
U.S. Manufacturing | Downstream |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |
Recoverable Amount |  |  |  | $ 5,400,000,000 |  |
Clearwater, Elmworth-Wapiti and Kaybob-Edson |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |
Recoverable Amount |  |  |  |  | $ 2,000,000,000 |
Clearwater, Elmworth-Wapiti and Kaybob-Edson | 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 |
Clearwater, Elmworth-Wapiti and Kaybob-Edson | 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 |
CGUs | Conventional | Upstream |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |
CGU Impairments |  | $ 315,000,000 |  |  |  | $ 240,000,000
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] |  |  |  |  |  |
CGU Impairments |  |  |  |  | $ 1,900,000,000 |
Recoverable Amount |  |  |  |  | $ 2,500,000,000 |
Impairment Reversals (Note 11) |  |  |  | 1,200,000,000 |  |
Borger CGU | Downstream |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |
Recoverable Amount |  |  | $ 692,000,000 |  |  |
Borger CGU | U.S. Manufacturing | Downstream |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |
CGU Impairments |  |  | 450,000,000 |  |  |
Wood River CGU | Downstream |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |
Goodwill impairments |  |  | $ 0 |  |  |
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 |  |  |  | $ 1,500,000,000 |  |
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 | Discount rate |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |
CGU Impairments |  |  |  | $ 69,000,000 |  |
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 |  |  |  | $ 226,000,000 |  |

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