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Debt and Capital Structure - Additional Information (Detail) $ in Millions, $ in Millions | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2022 CAD ($) $ / bbl | Dec. 31, 2022 USD ($) | Nov. 10, 2022 CAD ($) | Dec. 31, 2021 CAD ($) | Dec. 31, 2021 USD ($) | Oct. 07, 2021 USD ($) | Sep. 13, 2021 USD ($) | Aug. 18, 2021 CAD ($) | Jan. 01, 2021 CAD ($) | Jan. 01, 2021 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Outstanding letters of credit | $ 490 |  |  | $ 565 |  |  |  |  |  |
Weighted average interest rate | 4.70% | 4.70% |  | 4.60% | 4.60% |  |  |  |  |
Total Debt | $ 8,691 |  |  | $ 12,385 |  |  |  |  |  |
Maximum debt to capitalization ratio | 65.00% | 65.00% |  |  |  |  |  |  |  |
Target Net Debt to Adjusted EBITDA Ratio | 1.0 |  |  |  |  |  |  |  |  |
Average crude oil price | $ / bbl | 45.00 |  |  |  |  |  |  |  |  |
Target net debt | $ 4,000 |  |  |  |  |  |  |  |  |
Debt offering, maximum amount |  | $ 4,700 |  |  |  | $ 5,000 |  |  |  |
Uncommitted Demand Facilities |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Committed demand facilities | 1,400 |  |  |  |  |  |  |  |  |
Uncommitted Demand Facilities | Top of range |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Amount of undrawn facilities for general purposes | 1,000 |  |  |  |  |  |  |  |  |
WRB Refining LP |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Committed demand facilities | 190 | 140 |  |  |  |  |  |  |  |
Undrawn borrowing facilities |  | 170 |  |  | $ 125 |  |  |  |  |
WRB Refining LP | Cenovus Energy Inc |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Undrawn borrowing facilities | 115 | 85 |  | 79 | 63 |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Committed credit facilities, maximum borrowing capacity | 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 |  |  | 300 |  |  |  |  |
Maximum | WRB Refining LP | Cenovus Energy Inc |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Committed credit facilities, maximum borrowing capacity |  | $ 225 |  |  | $ 150 |  |  |  |  |
Maximum | Sunrise Oil Sands Partnership |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Committed credit facilities, maximum borrowing capacity |  |  |  | 10 |  |  |  |  |  |
Maximum | Sunrise Oil Sands Partnership | Cenovus Energy Inc |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Committed credit facilities, maximum borrowing capacity |  |  |  | 5 |  |  |  |  |  |
Committed Credit Facility |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Committed credit facilities, maximum borrowing capacity |  |  | $ 5,500 |  |  |  |  | $ 6,000 |  |
Undrawn borrowing facilities | 0 |  |  | $ 0 |  |  |  |  |  |
Decrease in capacity of committed credit facility |  |  | $ 500 |  |  |  |  |  |  |
Committed credit facilities, cancelled |  |  |  |  |  |  |  | $ 8,500 |  |
Committed Credit Facility | The Arrangement |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Committed credit facilities, maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 4,000 |
Total Debt |  |  |  |  |  |  |  |  | 350 |
Committed Credit Facilities, Maturing August 18, 2024 |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Committed credit facilities, maximum borrowing capacity | 1,800 |  |  |  |  |  |  |  |  |
Committed Credit Facilities, Maturing August 18, 2025 |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Committed credit facilities, maximum borrowing capacity | $ 3,700 |  |  |  |  |  |  |  |  |
Senior unsecured notes, 2.65%, maturing January 15, 2032 |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Total Debt |  |  |  |  |  |  | $ 500 |  |  |
Senior unsecured notes, 3.75%, maturing February 15, 2052 |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Total Debt |  |  |  |  |  |  | 750 |  |  |
Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Total Debt |  |  |  |  |  |  | $ 1,250 |  |  |
Canadian Dollar Denominated Unsecured Notes | The Arrangement |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Total Debt |  |  |  |  |  |  |  |  | 2,800 |
Long-term debt, fair value |  |  |  |  |  |  |  |  | 2,900 |
U.S. Dollar Denominated Unsecured Notes | The Arrangement |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Total Debt |  |  |  |  |  |  |  |  | 3,000 | $ 2,400
Long-term debt, fair value |  |  |  |  |  |  |  |  | $ 3,400 |

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