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Debt and Capital Structure - Additional Information (Details) $ in Millions, $ in Millions |  | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 CAD ($) | Sep. 30, 2025 CAD ($) $ / bbl | Dec. 31, 2025 | Sep. 30, 2025 USD ($) | Jul. 15, 2025 USD ($) | Dec. 31, 2024 CAD ($) | Dec. 31, 2024 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Outstanding letters of credit | $ 338 | $ 338 |  |  |  | $ 355 |
Current borrowings | 0 | $ 0 |  |  |  | 173 |
Maximum debt to capitalization ratio |  |  | 65.00% |  |  |  |
Target net debt to adjusted EBITDA ratio |  | 1.0 |  |  |  |  |
Target net debt | 4,000 | $ 4,000 |  |  |  |  |
Average crude oil price | $ / bbl |  | 45.00 |  |  |  |  |
WRB Refining LP |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Current borrowings | 0 | $ 0 |  |  |  | 173 | $ 120
Undrawn borrowing facilities, outstanding | $ 313 | 313 |  | $ 225 |  |  |
WRB Refining LP |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Share of equity investment | 50.00% |  |  |  |  |  |
Uncommitted Demand Facility |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Current borrowings | $ 0 | 0 |  |  |  | 0 |
Committed Credit Facilities, Maturing November 10, 2025 |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Credit facilities, maximum borrowing capacity | 3,300 | 3,300 |  |  |  |  |
Committed Credit Facilities, Maturing November 10, 2026 |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Credit facilities, maximum borrowing capacity | 2,200 | 2,200 |  |  |  |  |
Committed credit facilities |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Undrawn borrowing facilities, outstanding | 0 | 0 |  |  |  | 0 |
U.S. Dollar Denominated Unsecured Notes | Five Point Three Eight Percentage Due July 15, 2025 | Long-Term Debt |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Long-term debt, interest rate |  |  |  |  | 5.38% |  |
Repayment of principal |  |  |  |  | $ 133 |  |
Maximum |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Credit facilities, maximum borrowing capacity | 1,500 | 1,500 |  |  |  | $ 1,700 |
Maximum | Maximum |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Amount of undrawn facilities for general purposes | $ 1,400 | $ 1,400 |  |  |  |  |

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