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Long-term Debt and Capital Structure - Additional Information (Detail) $ in Millions | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 CAD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) | Jul. 30, 2020 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2019 USD ($) | Sep. 19, 2019 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Weighted average interest rate | 4.90% | 4.90% |  | 4.90% |  | 5.10% | 5.10% |
Total Debt Principal |  |  |  | $ 5,898,000,000 |  |  | $ 4,998,000,000 |
Committed Credit Facility [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Maturity date |  | Cenovus has in place a committed revolving credit facility that consists of a $1.2 billion tranche and a $3.3 billion tranche with maturity dates of November 30, 2022 and November 30, 2023, respectively. In April 2020, the Company added a committed credit facility with capacity of $1.1 billion to further support the Company’s financial resilience in the current market environment. On December 31, 2020, the Company cancelled the $1.1 billion credit facility. | Cenovus has in place a committed revolving credit facility that consists of a $1.2 billion tranche and a $3.3 billion tranche with maturity dates of November 30, 2022 and November 30, 2023, respectively. In April 2020, the Company added a committed credit facility with capacity of $1.1 billion to further support the Company’s financial resilience in the current market environment. On December 31, 2020, the Company cancelled the $1.1 billion credit facility. |  |  |  |  |
Credit facility cancellation | $ 1,100 |  |  |  |  |  |  |
Top of Range [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Target Net Debt to Adjusted EBITDA Ratio |  | 2.0 | 2.0 |  |  |  |  |
Debt to capitalization ratio | 65.00% | 65.00% |  | 65.00% |  |  |  |
Base Shelf Prospectus [Member] | Top of Range [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Authorized capacity under base shelf prospectus |  |  |  |  |  |  |  | $ 5,000,000,000
Tranche One [Member] | Committed Credit Facility [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Maturity date |  | November 30, 2022 | November 30, 2022 |  |  |  |  |
Tranche One [Member] | Top of Range [Member] | Committed Credit Facility [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Committed credit facility capacity | $ 1,100 | $ 1,100 |  |  |  | $ 1,200 |  |
Tranche Two [Member] | Committed Credit Facility [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Maturity date |  | November 30, 2023 | November 30, 2023 |  |  |  |  |
Tranche Two [Member] | Top of Range [Member] | Committed Credit Facility [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Committed credit facility capacity |  |  |  |  |  | $ 3,300 |  |
Senior Unsecured Notes |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Total Debt Principal |  |  |  |  | $ 1,000,000,000 |  |  |
Long-term Borrowings [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Payment to repurchase unsecured notes |  |  | $ 81,000,000 |  |  |  |  |
Unsecured notes principal repurchase |  |  |  | $ 100,000,000 |  |  |  |
Gain on debt repurchase recorded in finance cost |  | $ 25 |  |  |  |  |  |

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