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Property, Plant and Equipment, Net - Summary of Property, Plant and Equipment (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Feb. 28, 2023
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning Balance $ 37,250    
Ending Balance 38,568 $ 37,250  
Property, Plant and Equipment, Net 38,568 37,250  
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 62,375 57,739  
Acquisition 15 781  
Additions 4,950 4,214  
Transfer from E&E (Note 15) 285 60  
Change in Decommissioning Liabilities 313 581  
Divestitures (271) (667)  
Exchange Rate Movements and Other 1,003 (333)  
Ending Balance 68,670 62,375  
Property, Plant and Equipment, Net 68,670 62,375  
ACCUMULATED DEPRECIATION, DEPLETION AND AMORTIZATION      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning Balance (25,125) (21,240)  
Divestitures 208 319  
Exchange Rate Movements and Other 605 (147)  
Depreciation, Depletion and Amortization 4,580 4,351  
Ending Balance (30,102) (25,125)  
Property, Plant and Equipment, Net (30,102) (25,125)  
Crude Oil and Natural Gas Properties      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning Balance 29,450    
Ending Balance 30,241 29,450  
Property, Plant and Equipment, Net 30,241 29,450  
Crude Oil and Natural Gas Properties | COST      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning Balance 47,425 43,528  
Acquisition 15 11  
Additions 4,215 3,392  
Transfer from E&E (Note 15) 285 60  
Change in Decommissioning Liabilities 312 542  
Divestitures (270) (17)  
Exchange Rate Movements and Other 108 (91)  
Ending Balance 52,090 47,425  
Property, Plant and Equipment, Net 52,090 47,425  
Crude Oil and Natural Gas Properties | ACCUMULATED DEPRECIATION, DEPLETION AND AMORTIZATION      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning Balance (17,975) (14,302)  
Divestitures 208 8  
Exchange Rate Movements and Other 133 (11)  
Depreciation, Depletion and Amortization 3,949 3,692  
Ending Balance (21,849) (17,975)  
Property, Plant and Equipment, Net (21,849) (17,975)  
Processing, Transportation and Storage Assets      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning Balance 143    
Ending Balance 139 143  
Property, Plant and Equipment, Net 139 143  
Processing, Transportation and Storage Assets | COST      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning Balance 272 254  
Acquisition 0 0  
Additions 3 14  
Transfer from E&E (Note 15) 0 0  
Change in Decommissioning Liabilities 2 0  
Divestitures 0 0  
Exchange Rate Movements and Other 3 4  
Ending Balance 280 272  
Property, Plant and Equipment, Net 280 272  
Processing, Transportation and Storage Assets | ACCUMULATED DEPRECIATION, DEPLETION AND AMORTIZATION      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning Balance (129) (106)  
Divestitures 0 0  
Exchange Rate Movements and Other 1 4  
Depreciation, Depletion and Amortization 11 19  
Ending Balance (141) (129)  
Property, Plant and Equipment, Net (141) (129)  
Refining Assets      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning Balance 7,103    
Ending Balance 7,650 7,103  
Property, Plant and Equipment, Net 7,650 7,103  
Refining Assets | COST      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning Balance 12,770 12,132  
Acquisition 0 770  
Additions 661 719  
Transfer from E&E (Note 15) 0 0  
Change in Decommissioning Liabilities 4 21  
Divestitures 0 (633)  
Exchange Rate Movements and Other 890 (239)  
Ending Balance 14,325 12,770  
Property, Plant and Equipment, Net 14,325 12,770  
Refining Assets | ACCUMULATED DEPRECIATION, DEPLETION AND AMORTIZATION      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning Balance (5,667) (5,547)  
Divestitures 0 299  
Exchange Rate Movements and Other 469 (135)  
Depreciation, Depletion and Amortization 539 554  
Ending Balance (6,675) (5,667)  
Property, Plant and Equipment, Net (6,675) (5,667)  
Other Assets      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning Balance 554    
Ending Balance 538 554  
Property, Plant and Equipment, Net 538 554  
Other Assets | COST      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning Balance 1,908 1,825  
Acquisition 0 0  
Additions 71 89  
Transfer from E&E (Note 15) 0 0  
Change in Decommissioning Liabilities (5) 18  
Divestitures (1) (17)  
Exchange Rate Movements and Other 2 (7)  
Ending Balance 1,975 1,908  
Property, Plant and Equipment, Net 1,975 1,908  
Other Assets | ACCUMULATED DEPRECIATION, DEPLETION AND AMORTIZATION      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning Balance (1,354) (1,285)  
Divestitures 0 12  
Exchange Rate Movements and Other 2 (5)  
Depreciation, Depletion and Amortization 81 86  
Ending Balance (1,437) (1,354)  
Property, Plant and Equipment, Net $ (1,437) $ (1,354)