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Debt and Capital Structure - Additional Information (Detail) | 1 Months Ended | 2 Months Ended | 12 Months Ended |  |  |  |  |  |  |
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Feb. 08, 2022 USD ($) | Oct. 31, 2021 CAD ($) | Dec. 31, 2021 CAD ($) $ / bbl | Jan. 10, 2022 USD ($) | Dec. 31, 2021 USD ($) | Oct. 31, 2021 USD ($) | Oct. 07, 2021 USD ($) | Jan. 01, 2021 CAD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CAD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Outstanding letters of credit |  |  | $ 565,000,000 |  |  |  |  |  | $ 441,000,000 |  |
Total debt principal |  |  |  |  | $ 7,400,000,000 |  |  |  |  | $ 5,900,000,000 |
Weighted average interest rate |  |  | 4.60% |  | 4.60% |  |  |  | 4.90% | 4.90% |
Maximum debt to capitalization ratio |  |  | 65.00% |  | 65.00% |  |  |  |  |  |
Average crude oil price | $ / bbl |  |  | 45.00 |  |  |  |  |  |  |  |
Debt offering, maximum amount |  |  |  |  | $ 4,700,000,000 |  | $ 5,000,000,000 |  |  |  |
Short-Term Borrowings |  |  | $ 79,000,000 |  |  |  |  |  | $ 121,000,000 |  |
Rolling Twelve Month Basis |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Short-Term Borrowings |  |  | 79,000,000 |  |  |  |  |  | 121,000,000 |  | $ 0
WRB Refining LP |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Committed demand facilities |  |  |  |  | 88,000,000 |  |  |  |  |  |
Short-Term Borrowings |  |  | 79,000,000 |  |  |  |  |  | 121,000,000 |  |
Sunrise Oil Sands Partnership |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Short-Term Borrowings |  |  | $ 0 |  |  |  |  |  | 0 |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Target Net Debt to Adjusted EBITDA Ratio |  |  | 1.0 |  |  |  |  |  |  |  |
Target net debt |  |  | $ 6,000,000,000 |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Committed credit facilities, maximum borrowing capacity |  |  | 1,900,000,000 |  |  |  |  |  |  |  |
Committed demand facilities |  |  |  |  |  |  |  |  | 1,600,000,000 |  |
Amount of undrawn facilities for general purposes |  |  | $ 1,400,000,000 |  |  |  |  |  | 600,000,000 |  |
Target Net Debt to Adjusted EBITDA Ratio |  |  | 1.5 |  |  |  |  |  |  |  |
Target net debt |  |  | $ 8,000,000,000 |  |  |  |  |  |  |  |
Maximum | WRB Refining LP |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Committed demand facilities |  |  |  |  | 300,000,000 |  |  |  |  |  |
Increase (decrease) in undrawn borrowing facilities | $ 150,000,000 |  |  |  |  |  |  |  |  |  |
Maximum | WRB Refining LP | Cenovus Energy Inc |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Committed demand facilities |  |  |  |  | 150,000,000 |  |  |  |  |  |
Increase (decrease) in undrawn borrowing facilities | $ 75,000,000 |  |  |  |  |  |  |  |  |  |
Maximum | Sunrise Oil Sands Partnership |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Committed demand facilities |  |  | 10,000,000 |  |  |  |  |  |  |  |
Maximum | Sunrise Oil Sands Partnership | Cenovus Energy Inc |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Committed demand facilities |  |  | 5,000,000 |  |  |  |  |  |  |  |
Cenovus And Husky Merger |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Outstanding letters of credit |  |  |  |  |  |  |  | $ 427,000,000 |  |  |
Cenovus And Husky Merger | Maximum |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Undrawn borrowing facilities |  |  |  |  |  |  |  | 40,000,000 |  |  |
Unsecured Notes |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Total debt principal |  |  |  |  |  | $ 2,200,000,000 |  |  |  |  |
Redemption premium |  | $ 121,000,000 |  |  |  |  |  |  |  |  |
Principal amount of debt repayments |  |  |  |  |  | $ 2,300,000,000 |  |  |  |  |
Uncommitted Demand Facility |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Short-Term Borrowings |  |  | 0 |  |  |  |  |  | 0 |  |
Uncommitted Demand Facility | Cenovus And Husky Merger | Maximum |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Committed credit facilities, maximum borrowing capacity |  |  |  |  |  |  |  | $ 975,000,000 |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Total debt principal |  |  | 12,113,000,000 |  | 7,385,000,000 |  |  |  | 7,510,000,000 | $ 5,898,000,000 |
Long-Term Debt | U.S. Dollar Denominated Unsecured Notes |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Total debt principal |  |  | $ 9,363,000,000 |  | $ 7,385,000,000 |  |  |  | 7,510,000,000 | 5,898,000,000 |
Borrowings, intent to redeem outstanding balance |  |  |  | $ 384,000,000 |  |  |  |  |  |  |
Long-Term Debt | U.S. Dollar Denominated Unsecured Notes | 4.00% due April 15, 2024 |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate |  |  | 4.00% | 4.00% | 4.00% | 4.00% |  |  |  |  |
Total debt principal |  |  | $ 341,000,000 |  | $ 269,000,000 |  |  |  | 0 | 0 |
Long-Term Debt | U.S. Dollar Denominated Unsecured Notes | 4.40% due April 15, 2029 |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate |  |  | 4.40% |  | 4.40% |  |  |  |  |  |
Total debt principal |  |  | $ 951,000,000 |  | $ 750,000,000 |  |  |  | 0 | 0 |
Long-Term Debt | U.S. Dollar Denominated Unsecured Notes | 6.80% due September 15, 2037 |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate |  |  | 6.80% |  | 6.80% |  |  |  |  |  |
Total debt principal |  |  | $ 490,000,000 |  | $ 387,000,000 |  |  |  | $ 0 | $ 0 |

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