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Leases - Summary of Right of Use Assets, Net (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Feb. 28, 2023
Disclosure of quantitative information about right-of-use assets [line items]      
Balance at beginning of period $ 1,680    
Balance at end of period 1,950 $ 1,680  
Right-of-Use Assets, Net 1,950 1,680  
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 2,783 2,687  
Acquisitions   33  
Additions 370 57  
Divestitures   (19)  
Exchange Rate Movements and Other 134 25  
Balance at end of period 3,287 2,783  
Right-of-Use Assets, Net 3,287 2,783  
ACCUMULATED DEPRECIATION      
Disclosure of quantitative information about right-of-use assets [line items]      
Balance at beginning of period 1,103 842  
Divestitures   (12)  
Exchange Rate Movements and Other (57) (20)  
Depreciation 291 293  
Balance at end of period 1,337 1,103  
Real Estate      
Disclosure of quantitative information about right-of-use assets [line items]      
Balance at beginning of period 432    
Balance at end of period 399 432  
Right-of-Use Assets, Net 399 432  
Real Estate | COST      
Disclosure of quantitative information about right-of-use assets [line items]      
Balance at beginning of period 588 599  
Acquisitions   1  
Additions 2 1  
Divestitures   0  
Exchange Rate Movements and Other 2 (13)  
Balance at end of period 592 588  
Right-of-Use Assets, Net 592 588  
Real Estate | ACCUMULATED DEPRECIATION      
Disclosure of quantitative information about right-of-use assets [line items]      
Balance at beginning of period 156 127  
Divestitures   0  
Exchange Rate Movements and Other 2 (7)  
Depreciation 35 36  
Balance at end of period 193 156  
Transportation And Storage Assets      
Disclosure of quantitative information about right-of-use assets [line items]      
Balance at beginning of period 1,101    
Balance at end of period 1,393 1,101  
Right-of-Use Assets, Net 1,393 1,101  
Transportation And Storage Assets | COST      
Disclosure of quantitative information about right-of-use assets [line items]      
Balance at beginning of period 1,964 1,840  
Acquisitions   24  
Additions 317 56  
Divestitures   0  
Exchange Rate Movements and Other 111 44  
Balance at end of period 2,392 1,964  
Right-of-Use Assets, Net 2,392 1,964  
Transportation And Storage Assets | ACCUMULATED DEPRECIATION      
Disclosure of quantitative information about right-of-use assets [line items]      
Balance at beginning of period 863 645  
Divestitures   0  
Exchange Rate Movements and Other (62) (5)  
Depreciation 198 223  
Balance at end of period 999 863  
Refining Assets      
Disclosure of quantitative information about right-of-use assets [line items]      
Balance at beginning of period 96    
Balance at end of period 84 96  
Right-of-Use Assets, Net 84 96  
Refining Assets | COST      
Disclosure of quantitative information about right-of-use assets [line items]      
Balance at beginning of period 161 174  
Acquisitions   8  
Additions 0 0  
Divestitures   (19)  
Exchange Rate Movements and Other 17 (2)  
Balance at end of period 178 161  
Right-of-Use Assets, Net 178 161  
Refining Assets | ACCUMULATED DEPRECIATION      
Disclosure of quantitative information about right-of-use assets [line items]      
Balance at beginning of period 65 58  
Divestitures   (12)  
Exchange Rate Movements and Other 8 (3)  
Depreciation 21 22  
Balance at end of period 94 65  
Other Assets      
Disclosure of quantitative information about right-of-use assets [line items]      
Balance at beginning of period 51    
Balance at end of period 74 51  
Right-of-Use Assets, Net 74 51  
Other Assets | COST      
Disclosure of quantitative information about right-of-use assets [line items]      
Balance at beginning of period 70 74  
Acquisitions   0  
Additions 51 0  
Divestitures   0  
Exchange Rate Movements and Other 4 (4)  
Balance at end of period 125 70  
Right-of-Use Assets, Net 125 70  
Other Assets | ACCUMULATED DEPRECIATION      
Disclosure of quantitative information about right-of-use assets [line items]      
Balance at beginning of period 19 12  
Divestitures   0  
Exchange Rate Movements and Other (5) (5)  
Depreciation 37 12  
Balance at end of period $ 51 $ 19