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Risk Management - Additional Information (Detail) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 CAD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 CAD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 CAD ($)
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |
Fair value of derivative financial instruments net | $ 12,000,000 |  | $ 46,000,000 |  | $ (68,000,000)
Percentage of accounts receivable outstanding, less than 60 days | 98.00% | 98.00% |  |  |
Target Net Debt to Adjusted EBITDA Ratio | 1.0 |  |  |  |
Cash and cash equivalents | $ 2,227,000,000 |  | 4,524,000,000 |  | $ 2,873,000,000
Long-Term Debt |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |
Notional value | 7,028,000,000 |  | 8,537,000,000 |  |
U.S. Dollar Denominated Unsecured Notes | Long-Term Debt |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |
Notional value | 5,028,000,000 | $ 3,802 | 6,537,000,000 | $ 4,800 |
WRB Refining LP |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |
Uncommitted demand facilities | 119,000,000 | 90 |  |  |
Uncommitted Demand Facilities |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |
Uncommitted demand facilities | $ 1,400,000,000 |  |  |  |
Fair value derivative financial instruments |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |
Average contract financial term | 13 months |  |  |  |
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 | $ 1,100,000,000 |  |  |  |
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 |  |  |  |
Foreign Exchange Rate Contracts |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |
Notional value |  | $ 0 |  | $ 168 |
Interest rate swap contract |  |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |  |
Notional value |  |  | $ 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% | 0.40% | 0.40% |
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 | 83.00% | 83.00% | 85.00% | 85.00% |

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