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Description of Business and Segmented Disclosures - Schedule of Capital Expenditures (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Feb. 28, 2023
Disclosure Of Reportable Segments [Line Items]      
Capital Investment $ 5,015 $ 4,298  
Acquisitions 22 427  
Total Capital Expenditures 5,037 4,725  
BP-Husky Refining LLC      
Disclosure Of Reportable Segments [Line Items]      
Fair Value of Pre-Existing 50 Percent Ownership Interest in Toledo     $ 508
Upstream      
Disclosure Of Reportable Segments [Line Items]      
Capital Investment 4,280 3,476  
Downstream      
Disclosure Of Reportable Segments [Line Items]      
Capital Investment 696 747  
Oil Sands      
Disclosure Of Reportable Segments [Line Items]      
Acquisitions 9 37  
Oil Sands | Upstream      
Disclosure Of Reportable Segments [Line Items]      
Capital Investment 2,714 2,382  
Conventional      
Disclosure Of Reportable Segments [Line Items]      
Acquisitions 13 5  
Conventional | Upstream      
Disclosure Of Reportable Segments [Line Items]      
Capital Investment 421 452  
Offshore | Upstream | Atlantic      
Disclosure Of Reportable Segments [Line Items]      
Capital Investment 1,077 635  
Offshore | Upstream | Asia Pacific      
Disclosure Of Reportable Segments [Line Items]      
Capital Investment 68 7  
Canadian Refining | Downstream      
Disclosure Of Reportable Segments [Line Items]      
Capital Investment 208 145  
U.S. Refining      
Disclosure Of Reportable Segments [Line Items]      
Acquisitions 0 385  
U.S. Refining | BP-Husky Refining LLC      
Disclosure Of Reportable Segments [Line Items]      
Fair Value of Pre-Existing 50 Percent Ownership Interest in Toledo   368  
U.S. Refining | Downstream      
Disclosure Of Reportable Segments [Line Items]      
Capital Investment 488 602  
Corporate and Eliminations      
Disclosure Of Reportable Segments [Line Items]      
Capital Investment $ 39 $ 75