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Property, Plant and Equipment, Net - Summary of Property, Plant and Equipment (Detail) - CAD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2023
Feb. 28, 2023
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance $ 36,499  
Ending balance 36,727  
Property, Plant and Equipment, Net 36,727  
Oil Sands    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 24,657  
Ending balance 24,271  
Property, Plant and Equipment, Net 24,271  
Write-downs (reversals of write-downs) of property, plant and equipment 20  
Canadian Manufacturing    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 2,466  
Ending balance 2,438  
Property, Plant and Equipment, Net 2,438  
Write-downs (reversals of write-downs) of property, plant and equipment 8  
BP-Husky Refining LLC    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, Plant and Equipment, Net   $ 334
COST    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 57,739  
Acquisitions 683  
Additions 3,048  
Change in Decommissioning Liabilities 44  
Divestitures 667  
Exchange Rate Movements and Other (61)  
Ending balance 60,786  
Property, Plant and Equipment, Net 60,786  
ACCUMULATED DEPRECIATION, DEPLETION AND AMORTIZATION    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (21,240)  
Divestitures (319)  
Exchange Rate Movements and Other (12)  
Depreciation, depletion and amortization 3,150  
Ending balance (24,059)  
Property, Plant and Equipment, Net (24,059)  
Crude Oil and Natural Gas Properties    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 29,226  
Ending balance 28,995  
Property, Plant and Equipment, Net 28,995  
Crude Oil and Natural Gas Properties | COST    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 43,528  
Acquisitions 9  
Additions 2,485  
Change in Decommissioning Liabilities 42  
Divestitures 17  
Exchange Rate Movements and Other (19)  
Ending balance 46,028  
Property, Plant and Equipment, Net 46,028  
Crude Oil and Natural Gas Properties | ACCUMULATED DEPRECIATION, DEPLETION AND AMORTIZATION    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (14,302)  
Divestitures (8)  
Exchange Rate Movements and Other 13  
Depreciation, depletion and amortization 2,726  
Ending balance (17,033)  
Property, Plant and Equipment, Net (17,033)  
Processing, Transportation and Storage Assets    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 148  
Ending balance 152  
Property, Plant and Equipment, Net 152  
Processing, Transportation and Storage Assets | COST    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 254  
Acquisitions 0  
Additions 19  
Change in Decommissioning Liabilities 0  
Divestitures 0  
Exchange Rate Movements and Other 5  
Ending balance 278  
Property, Plant and Equipment, Net 278  
Processing, Transportation and Storage Assets | ACCUMULATED DEPRECIATION, DEPLETION AND AMORTIZATION    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (106)  
Divestitures 0  
Exchange Rate Movements and Other 4  
Depreciation, depletion and amortization 16  
Ending balance (126)  
Property, Plant and Equipment, Net (126)  
Manufacturing Assets    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 6,585  
Ending balance 7,053  
Property, Plant and Equipment, Net 7,053  
Manufacturing Assets | COST    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 12,132  
Acquisitions 674  
Additions 508  
Change in Decommissioning Liabilities 2  
Divestitures 633  
Exchange Rate Movements and Other (39)  
Ending balance 12,644  
Property, Plant and Equipment, Net 12,644  
Manufacturing Assets | ACCUMULATED DEPRECIATION, DEPLETION AND AMORTIZATION    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (5,547)  
Divestitures (299)  
Exchange Rate Movements and Other (23)  
Depreciation, depletion and amortization 366  
Ending balance (5,591)  
Property, Plant and Equipment, Net (5,591)  
Retail and Other Assets    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 540  
Ending balance 527  
Property, Plant and Equipment, Net 527  
Retail and Other Assets | COST    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 1,825  
Acquisitions 0  
Additions 36  
Change in Decommissioning Liabilities 0  
Divestitures 17  
Exchange Rate Movements and Other (8)  
Ending balance 1,836  
Property, Plant and Equipment, Net 1,836  
Retail and Other Assets | ACCUMULATED DEPRECIATION, DEPLETION AND AMORTIZATION    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (1,285)  
Divestitures (12)  
Exchange Rate Movements and Other (6)  
Depreciation, depletion and amortization 42  
Ending balance (1,309)  
Property, Plant and Equipment, Net $ (1,309)