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Debt and Capital Structure - Additional Information (Detail) $ in Millions, $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2023 CAD ($) $ / bbl | Sep. 30, 2023 USD ($) | Dec. 31, 2022 CAD ($) | Dec. 31, 2022 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |
Outstanding letters of credit | $ 353 |  | $ 490 |
Current borrowings | $ 14 |  | 115 |
Maximum debt to capitalization ratio | 65.00% | 65.00% |  |
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 | $ 1,800 |  |  |
Committed Credit Facilities, Maturing November 10, 2026 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Credit facilities, maximum borrowing capacity | 3,700 |  |  |
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 | $ 14 |  | 115 |
Proportion of ownership interest in joint operation | 50.00% |  |  |
Undrawn borrowing facilities, outstanding |  | $ 20 |  |
WRB Refining LP | Cenovus Energy Inc |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Undrawn borrowing facilities, outstanding | $ 14 | 10 | 115 | $ 85
Maximum |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Credit facilities, maximum borrowing capacity | 1,700 |  | $ 1,900 |
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

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