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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% |

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