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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