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Debt and Capital Structure - Additional Information (Detail) $ in Millions, $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2024 CAD ($) $ / bbl | Sep. 30, 2024 USD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2023 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |
Outstanding letters of credit | $ 375 |  | $ 364 |
Current borrowings | $ 101 |  | 179 |
Maximum debt to capitalization ratio | 65.00% | 65.00% |  |
Target net debt to adjusted EBITDA ratio | 1.0 |  |  |
Target net debt | $ 4,000 |  |  |
Average crude oil price | $ / bbl | 45.00 |  |  |
Committed Credit Facilities, Maturing November 10, 2025 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Credit facilities, maximum borrowing capacity | $ 2,200 |  |  |
Committed Credit Facilities, Maturing November 10, 2026 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Credit facilities, maximum borrowing capacity | 3,300 |  |  |
Committed credit facilities |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Undrawn borrowing facilities, outstanding | 0 |  | 0 |
Uncommitted Demand Facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Current borrowings | 0 |  | 0 |
WRB Refining LP |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Current borrowings | $ 101 |  | 179 |
Proportion of ownership interest in joint operation | 50.00% |  |  |
Undrawn borrowing facilities, outstanding | $ 150 |  |  |
WRB Refining LP | Cenovus Energy Inc |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Undrawn borrowing facilities, outstanding | 101 | $ 75 | 179 | $ 135
Maximum |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Credit facilities, maximum borrowing capacity | 1,700 |  | 1,700 |
Maximum | Maximum |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Amount of undrawn facilities for general purposes | 1,400 |  |  |
Maximum | WRB Refining LP |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Credit facilities, maximum borrowing capacity |  | 450 |  |
Maximum | WRB Refining LP | Cenovus Energy Inc |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Credit facilities, maximum borrowing capacity |  |  |  | 225
Long-Term Debt |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notes and debentures issued | 7,132 |  | 7,028 |
Long-Term Debt | U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notes and debentures issued | $ 5,132 | $ 3,800 | $ 5,028 | $ 3,800

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