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Description of Business and Segmented Disclosures - Schedule of Capital Expenditures (Detail) - CAD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Disclosure Of Reportable Segments [Line Items]        
Capital Investment $ 1,025 $ 866 $ 3,128 $ 2,434
Acquisitions 33 1,601 377 1,602
Total Capital Expenditures 1,058 2,467 3,505 4,036
BP Products North America, Toledo        
Disclosure Of Reportable Segments [Line Items]        
Fair Value of Pre-Existing 50 Percent Ownership Interest in Toledo 320   320  
Fair Value of Pre-Existing 50 Percent Ownership Interest in Toledo 320   320  
Upstream        
Disclosure Of Reportable Segments [Line Items]        
Capital Investment 884 508 2,565 1,524
Downstream        
Disclosure Of Reportable Segments [Line Items]        
Capital Investment 126 324 534 851
Oil Sands        
Disclosure Of Reportable Segments [Line Items]        
Acquisitions (Note 3) 32 1,596 35 1,596
Oil Sands | Upstream        
Disclosure Of Reportable Segments [Line Items]        
Capital Investment 590 360 1,764 1,111
Conventional        
Disclosure Of Reportable Segments [Line Items]        
Acquisitions (Note 3) 1 5 5 6
Conventional | Upstream        
Disclosure Of Reportable Segments [Line Items]        
Capital Investment 100 67 323 188
Offshore | Asia Pacific | Upstream        
Disclosure Of Reportable Segments [Line Items]        
Capital Investment 3 3 4 5
Offshore | Atlantic Region | Upstream        
Disclosure Of Reportable Segments [Line Items]        
Capital Investment 191 78 474 220
Canadian Manufacturing | Downstream        
Disclosure Of Reportable Segments [Line Items]        
Capital Investment 38 24 99 77
U.S. Manufacturing        
Disclosure Of Reportable Segments [Line Items]        
Acquisitions (Note 3) 0 0 337 0
U.S. Manufacturing | Downstream        
Disclosure Of Reportable Segments [Line Items]        
Capital Investment 88 300 435 774
Corporate and Eliminations        
Disclosure Of Reportable Segments [Line Items]        
Capital Investment $ 15 $ 34 $ 29 $ 59