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Income Taxes - Provision for Income Taxes (Detail) - CAD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Major Components Of Tax Expense Income [Line Items]        
Current Tax Expense (Recovery) $ 563 $ 76 $ 1,116 $ 1,403
Deferred Tax Expense (Recovery) (2) 568 (416) 625
Tax Expense (Recovery) From Continuing Operations 561 644 700 2,028
BP-Husky Refining LLC        
Major Components Of Tax Expense Income [Line Items]        
Deferred Tax Expense (Recovery)     (176)  
Canada        
Major Components Of Tax Expense Income [Line Items]        
Current Tax Expense (Recovery) 484 187 941 1,124
United States        
Major Components Of Tax Expense Income [Line Items]        
Current Tax Expense (Recovery) 4 (185) 4 96
Asia Pacific        
Major Components Of Tax Expense Income [Line Items]        
Current Tax Expense (Recovery) 68 64 152 173
Other International        
Major Components Of Tax Expense Income [Line Items]        
Current Tax Expense (Recovery) $ 7 $ 10 $ 19 $ 10