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Risk Management - Additional Information (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2022
CAD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CAD ($)
Dec. 31, 2021
USD ($)
Oct. 07, 2021
USD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]              
Fair value of derivative financial instruments net $ 46,000,000   $ (68,000,000)     $ (53,000,000)  
Notional value       $ 7,400      
Interest rate sensitivity floating rate debt $ 1,000,000   1,000,000        
Percentage of accounts receivable outstanding, less than 60 days 99.00% 99.00%          
Target Net Debt to Adjusted EBITDA Ratio 1.0            
Cash and cash equivalents $ 4,524,000,000   2,873,000,000     $ 378,000,000 $ 186,000,000
Debt offering, maximum amount   $ 4,700     $ 5,000    
Long-Term Debt              
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]              
Notional value 8,537,000,000   12,113,000,000        
U.S. Dollar Denominated Unsecured Notes | Long-Term Debt              
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]              
Notional value 6,537,000,000 4,827 9,363,000,000 7,385      
U.S. Dollar Denominated Unsecured Notes | 3.80% due September 15, 2023 | Long-Term Debt              
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]              
Notional value 0 0 146,000,000 115      
U.S. Dollar Denominated Unsecured Notes | 4.00% due April 15, 2024 | Long-Term Debt              
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]              
Notional value 0 0 341,000,000 269      
WRB Refining LP              
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]              
Uncommitted demand facilities 190,000,000 140          
Uncommitted Demand Facilities              
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]              
Uncommitted demand facilities 1,400,000,000            
Top of range | Uncommitted Demand Facilities              
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]              
Amount of undrawn facilities for general purposes 1,000,000,000            
Liquidity risk | Committed Credit Facility              
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]              
Uncommitted demand facilities $ 5,500,000,000            
Liquidity risk | Top of range | Base Shelf Prospectus              
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]              
Debt offering, maximum amount   4,700          
Interest rate risk              
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]              
Changes in interest rate percentage 100.00%            
Foreign Exchange Rate Contracts              
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]              
Notional value   $ 168   $ 144      
Interest rate swap contract              
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]              
Notional value $ 0   $ 0        
Trade Receivables | Credit risk              
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]              
Average expected credit loss rate 0.40% 0.40% 0.10% 0.10%      
Trade Receivables | Credit risk | Investment grade counterparties              
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]              
Number of days outstanding for accruals, joint operations, trade receivables and net investment in finance leases 60 days 60 days          
Trade Receivables | Credit risk | Investment grade counterparties | Bottom of range              
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]              
Percent of accounts receivable held with investment grade counterparties 85.00% 85.00% 94.00% 94.00%      
Cross Currency Interest Rate Swap              
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]              
Notional value $ 0   $ 0