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Risk Management - Additional Information (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2024
CAD ($)
$ / bbl
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CAD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CAD ($)
Disclosure of risk management strategy related to hedge accounting [line items]          
Fair value of derivative financial instruments net $ 7,000,000   $ 12,000,000   $ 46,000,000
Percentage of accounts receivable outstanding, less than 60 days 96.00% 96.00%      
Target net debt to adjusted EBITDA ratio 1.0        
Average crude oil price | $ / bbl 45.00        
Cash and Cash Equivalents $ 3,093,000,000   2,227,000,000   $ 4,524,000,000
WRB Refining LP          
Disclosure of risk management strategy related to hedge accounting [line items]          
Uncommitted demand facilities 151,000,000 $ 105      
Uncommitted Demand Facilities          
Disclosure of risk management strategy related to hedge accounting [line items]          
Uncommitted demand facilities 1,300,000,000        
Liquidity risk | Committed Credit Facility          
Disclosure of risk management strategy related to hedge accounting [line items]          
Uncommitted demand facilities 5,500,000,000        
Top of range | Uncommitted Demand Facilities          
Disclosure of risk management strategy related to hedge accounting [line items]          
Amount of undrawn facilities for general purposes 1,100,000,000        
Long-Term Debt          
Disclosure of risk management strategy related to hedge accounting [line items]          
Total debt principal 7,470,000,000   7,028,000,000    
U.S. Dollar Denominated Unsecured Notes | Long-Term Debt          
Disclosure of risk management strategy related to hedge accounting [line items]          
Total debt principal 5,470,000,000 3,800 5,028,000,000 $ 3,800  
Foreign Exchange Rate Contracts          
Disclosure of risk management strategy related to hedge accounting [line items]          
Fair value of derivative financial instruments net (3,000,000)        
Total debt principal   $ 250      
Interest rate swap contract          
Disclosure of risk management strategy related to hedge accounting [line items]          
Total debt principal $ 0   $ 0    
Trade Receivables | Credit risk          
Disclosure of risk management strategy related to hedge accounting [line items]          
Average expected credit loss rate 0.40% 0.40% 0.40% 0.40%  
Trade Receivables | Investment grade counterparties | Credit risk          
Disclosure of risk management strategy related to hedge accounting [line items]          
Number of days outstanding for accruals, joint operations, trade receivables and net investment in finance leases 60 days 60 days      
Trade Receivables | Investment grade counterparties | Bottom of range | Credit risk          
Disclosure of risk management strategy related to hedge accounting [line items]          
Percent of accounts receivable held with investment grade counterparties 79.00% 79.00% 83.00% 83.00%