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Debt and Capital Structure - Additional Information (Detail) $ in Millions, $ in Millions | 8 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 30, 2022 | Dec. 31, 2023 CAD ($) $ / bbl | Dec. 31, 2023 USD ($) | Dec. 31, 2022 CAD ($) | Dec. 31, 2022 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Weighted average interest rate |  | 4.70% | 4.70% |  |
Outstanding letters of credit |  | $ 364 |  | $ 490 |
Current borrowings |  | $ 179 |  | 115 |
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 |  |  |
Uncommitted Demand Facilities | Top of range |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Amount of undrawn facilities for general purposes |  | $ 1,100 |  |  |
WRB Refining LP |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Current borrowings |  | $ 179 |  | 115 |
Proportion of ownership interest in joint operation |  | 50.00% |  |  |
Undrawn borrowing facilities |  |  | $ 270 |  |
WRB Refining LP | Cenovus Energy Inc |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Undrawn borrowing facilities |  | $ 179 | 135 | 115 | $ 85
Sunrise Oil Sands Partnership |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Proportion of ownership interest in joint operation | 50.00% |  |  |  |
Maximum |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Committed credit facilities, maximum borrowing capacity |  | 1,700 |  | 1,900 |
Maximum | Top of range |  |  |  |  |
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] |  |  |  |  |
Committed credit facilities, maximum borrowing capacity |  |  | $ 450 |  |
Maximum | WRB Refining LP | Cenovus Energy Inc |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Committed credit facilities, maximum borrowing capacity |  |  |  |  | $ 225
Committed Credit Facility |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Undrawn borrowing facilities |  | 0 |  | 0 |
Uncommitted Demand Facilities |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Current borrowings |  | 0 |  | $ 0 |
Committed Credit Facilities, Maturing August 18, 2025 |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Committed credit facilities, maximum borrowing capacity |  | 1,800 |  |  |
Committed Credit Facilities, Maturing August 18, 2026 |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Committed credit facilities, maximum borrowing capacity |  | $ 3,700 |  |  |

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