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Risk Management - Additional Information (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2021
CAD ($)
Jan. 10, 2022
Dec. 31, 2021
USD ($)
Oct. 31, 2021
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2018
CAD ($)
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]                
Notional value     $ 7,400     $ 5,900    
Fair Value Asset (Liability) $ (68,000,000)       $ (53,000,000)   $ 3,000,000  
Interest rate sensitivity floating rate debt 1,000,000       1,000,000      
Cash and cash equivalents 2,873,000,000       378,000,000   $ 186,000,000 $ 781,000,000
Long-Term Debt                
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]                
Notional value 12,113,000,000   7,385   7,510,000,000 5,898    
U.S. Dollar Denominated Unsecured Notes | Long-Term Debt                
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]                
Notional value 9,363,000,000   7,385   7,510,000,000 5,898    
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 $ 146,000,000   $ 115   573,000,000 450    
Long-term debt, interest rate 3.80% 3.80% 3.80%          
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 $ 341,000,000   $ 269   0 $ 0    
Long-term debt, interest rate 4.00% 4.00% 4.00% 4.00%        
WRB Refining LP                
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]                
Uncommitted demand facilities     $ 88          
Sunrise                
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]                
Uncommitted demand facilities $ 5,000,000              
Uncommitted Demand Facility                
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]                
Uncommitted demand facilities 1,900,000,000              
Top of range | Uncommitted Demand Facility                
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]                
Amount of undrawn facilities for general purposes 1,400,000,000              
Liquidity risk | Committed Credit Facility                
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]                
Uncommitted demand facilities $ 6,000,000,000              
Liquidity risk | Top of range | Base Shelf Prospectus                
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]                
Uncommitted demand facilities     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 contracts                
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]                
Notional value     $ 144          
Fair Value Asset (Liability) $ 2,000,000              
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 0.10%   0.10%   0.50% 0.50%    
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 97.00%   97.00%          
Cross Currency Interest Rate Swap                
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]                
Notional value $ 0       $ 0