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Debt and Capital Structure - Additional Information (Detail) $ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 CAD ($) $ / bbl | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2023 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |
Weighted average interest rate | 4.50% | 4.50% | 4.70% | 4.70%
Outstanding letters of credit | $ 355 |  | $ 364 |
Short-Term Borrowings | $ 173 |  | 179 |
Proportion of ownership interest in joint operation | 100.00% |  |  |
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 |  |  |
WRB Refining LP |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Short-Term Borrowings | $ 173 |  | 179 |
Proportion of ownership interest in joint operation | 50.00% |  |  |
Undrawn borrowing facilities |  | $ 240 |  |
WRB Refining LP | Cenovus Energy Inc |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Undrawn borrowing facilities | $ 173 | 120 | 179 | $ 135
Uncommitted Demand Facilities |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Short-Term Borrowings | 0 |  | 0 |
Committed Credit Facilities, Maturing August 18, 2025 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Committed credit facilities, maximum borrowing capacity | 2,200 |  |  |
Committed Credit Facilities, Maturing August 18, 2026 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Committed credit facilities, maximum borrowing capacity | 3,300 |  |  |
Committed Credit Facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Undrawn borrowing facilities | 0 |  | 0 |
U.S. Dollar Denominated Unsecured Notes | Long-Term Debt |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt principal |  |  |  | 1,000
Maximum |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Committed credit facilities, maximum borrowing capacity | 1,700 |  | $ 1,700 |
Maximum | WRB Refining LP |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Committed credit facilities, maximum borrowing capacity |  | $ 450 |  | $ 450
Maximum | Top of range |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Amount of undrawn facilities for general purposes | $ 1,400 |  |  |

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