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Debt and Capital Structure - Additional Information (Detail) |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 09, 2022 CAD ($) | Feb. 09, 2022 USD ($) | Jun. 30, 2022 CAD ($) | Jun. 30, 2021 CAD ($) | Jun. 30, 2022 CAD ($) $ / bbl | Jun. 30, 2021 CAD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2021 CAD ($) | Dec. 31, 2021 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Outstanding letters of credit |  |  | $ 514,000,000 |  | $ 514,000,000 |  |  | $ 565,000,000 |
Committed demand facilities |  |  | 0 |  | 0 |  |  | 0 |
Repayments of long-term debt |  |  | $ 750,000,000 | $ 0 | 1,260,000,000 | $ 0 |  |  |
Net premium (discount) on redemption of long-term debt |  |  |  | $ 0 | $ (25,000,000) | 0 |  |  |
Maximum debt to capitalization ratio |  |  | 65.00% |  | 65.00% |  | 65.00% |  |
Target net debt |  |  | $ 4,000,000,000 |  | $ 4,000,000,000 |  |  |  |
Average crude oil price | $ / bbl |  |  |  |  | 45.00 |  |  |  |
WRB Refining LP |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Committed demand facilities |  |  | 0 |  | $ 0 |  |  | 79,000,000 |
Sunrise Oil Sands Partnership |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Committed demand facilities |  |  | 0 |  | 0 |  |  | 0 |
Maximum |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Credit facilities, maximum borrowing capacity |  |  | 1,900,000,000 |  | 1,900,000,000 |  |  | 1,900,000,000 |
Amount of undrawn facilities for general purposes |  |  | 1,400,000,000 |  | 1,400,000,000 |  |  | 1,400,000,000 |
Maximum | WRB Refining LP |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Committed demand facilities |  |  |  |  |  |  | $ 450,000,000 |  | $ 300,000,000
Maximum | WRB Refining LP | Cenovus Energy Inc |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Committed demand facilities |  |  |  |  |  |  | 225,000,000 |  | 150,000,000
Maximum | Sunrise Oil Sands Partnership |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Committed demand facilities |  |  | 10,000,000 |  | 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 |  | $ 5,000,000 |  |  |  |
Minimum |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Target net debt to adjusted EBITDA ratio |  |  |  |  | 1.0 |  |  |  |
Committed Credit Facilities, Maturing August 18, 2024 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Credit facilities, maximum borrowing capacity |  |  | 2,000,000,000 |  | $ 2,000,000,000 |  |  |  |
Committed Credit Facilities, Maturing August 18, 2025 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Credit facilities, maximum borrowing capacity |  |  | 4,000,000,000 |  | 4,000,000,000 |  |  |  |
Unsecured notes, 3.80%, maturing 2023 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Long-term debt, interest rate | 3.80% | 3.80% |  |  |  |  |  |  |
Unsecured Notes |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  | $ 402,000,000 |  |  |  |  |  |  |
Redemption premium | $ 7,000,000 |  |  |  |  |  |  |  |
Net premium (discount) on redemption of long-term debt | $ (32,000,000) |  |  |  |  |  |  |  |
Canadian Dollar Denominated Unsecured Notes | 3.55% due March 12, 2025 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  | 750,000,000 |  |  |  |  |  |
Net premium (discount) on redemption of long-term debt |  |  | 32,000,000 |  |  |  |  |  |
Unsecured notes, 4.00%, maturing 2024 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Long-term debt, interest rate | 4.00% | 4.00% |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Total debt principal |  |  | 11,021,000,000 |  | 11,021,000,000 |  | $ 7,001,000,000 | 12,113,000,000 | $ 7,385,000,000
Repayments of long-term debt |  |  |  |  | 1,260,000,000 | $ 350,000,000 |  |  |
Net premium (discount) on redemption of long-term debt |  |  |  |  | (25,000,000) |  |  |  |
Long-Term Debt | Canadian Dollar Denominated Unsecured Notes |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Total debt principal |  |  | $ 2,000,000,000 |  | $ 2,000,000,000 |  |  | 2,750,000,000 |
Long-Term Debt | Canadian Dollar Denominated Unsecured Notes | 3.55% due March 12, 2025 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Long-term debt, interest rate |  |  | 3.55% |  | 3.55% |  | 3.55% |  |
Total debt principal |  |  | $ 0 |  | $ 0 |  |  | $ 750,000,000 |

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