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Right of Use Assets, Net - Summary of Right of Use Assets, Net (Detail) - CAD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2023
Feb. 28, 2023
Disclosure of quantitative information about right-of-use assets [line items]    
Balance at beginning of period $ 1,845  
Balance at end of period 1,738  
Right-of-Use Assets, Net 1,738  
BP-Husky Refining LLC    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-Use Assets, Net   $ 7
COST    
Disclosure of quantitative information about right-of-use assets [line items]    
Balance at beginning of period 2,687  
Acquisitions 33  
Additions 45  
Modifications 34  
Re-measurements (6)  
Divestitures (19)  
Terminations (6)  
Exchange Rate Movements and Other 23  
Balance at end of period 2,791  
Right-of-Use Assets, Net 2,791  
ACCUMULATED DEPRECIATION    
Disclosure of quantitative information about right-of-use assets [line items]    
Balance at beginning of period 842  
Divestitures (12)  
Terminations (3)  
Depreciation 224  
Exchange Rate Movements and Other 2  
Balance at end of period 1,053  
Real Estate    
Disclosure of quantitative information about right-of-use assets [line items]    
Balance at beginning of period 472  
Balance at end of period 440  
Right-of-Use Assets, Net 440  
Real Estate | COST    
Disclosure of quantitative information about right-of-use assets [line items]    
Balance at beginning of period 599  
Acquisitions 1  
Additions 1  
Modifications (4)  
Re-measurements 0  
Divestitures 0  
Terminations (3)  
Exchange Rate Movements and Other (4)  
Balance at end of period 590  
Right-of-Use Assets, Net 590  
Real Estate | ACCUMULATED DEPRECIATION    
Disclosure of quantitative information about right-of-use assets [line items]    
Balance at beginning of period 127  
Divestitures 0  
Terminations (1)  
Depreciation 27  
Exchange Rate Movements and Other (3)  
Balance at end of period 150  
Transportation And Storage Assets    
Disclosure of quantitative information about right-of-use assets [line items]    
Balance at beginning of period 1,195  
Balance at end of period 1,135  
Right-of-Use Assets, Net 1,135  
Transportation And Storage Assets | COST    
Disclosure of quantitative information about right-of-use assets [line items]    
Balance at beginning of period 1,840  
Acquisitions 24  
Additions 44  
Modifications 37  
Re-measurements (11)  
Divestitures 0  
Terminations (1)  
Exchange Rate Movements and Other 24  
Balance at end of period 1,957  
Right-of-Use Assets, Net 1,957  
Transportation And Storage Assets | ACCUMULATED DEPRECIATION    
Disclosure of quantitative information about right-of-use assets [line items]    
Balance at beginning of period 645  
Divestitures 0  
Terminations (1)  
Depreciation 170  
Exchange Rate Movements and Other 8  
Balance at end of period 822  
Manufacturing Assets    
Disclosure of quantitative information about right-of-use assets [line items]    
Balance at beginning of period 116  
Balance at end of period 103  
Right-of-Use Assets, Net 103  
Manufacturing Assets | COST    
Disclosure of quantitative information about right-of-use assets [line items]    
Balance at beginning of period 174  
Acquisitions 8  
Additions 0  
Modifications 1  
Re-measurements 0  
Divestitures (19)  
Terminations 0  
Exchange Rate Movements and Other 0  
Balance at end of period 164  
Right-of-Use Assets, Net 164  
Manufacturing Assets | ACCUMULATED DEPRECIATION    
Disclosure of quantitative information about right-of-use assets [line items]    
Balance at beginning of period 58  
Divestitures (12)  
Terminations 0  
Depreciation 17  
Exchange Rate Movements and Other (2)  
Balance at end of period 61  
Other Assets    
Disclosure of quantitative information about right-of-use assets [line items]    
Balance at beginning of period 62  
Balance at end of period 60  
Right-of-Use Assets, Net 60  
Other Assets | COST    
Disclosure of quantitative information about right-of-use assets [line items]    
Balance at beginning of period 74  
Acquisitions 0  
Additions 0  
Modifications 0  
Re-measurements 5  
Divestitures 0  
Terminations (2)  
Exchange Rate Movements and Other 3  
Balance at end of period 80  
Right-of-Use Assets, Net 80  
Other Assets | ACCUMULATED DEPRECIATION    
Disclosure of quantitative information about right-of-use assets [line items]    
Balance at beginning of period 12  
Divestitures 0  
Terminations (1)  
Depreciation 10  
Exchange Rate Movements and Other (1)  
Balance at end of period $ 20